A secondary ejection injection mold for a plastic decorative cover

Abstract

The utility model provides a secondary ejection injection mold for a plastic decorative cover, comprising a top plate, an upper mold, a lower mold, an ejection plate and a bottom plate, wherein the lower mold is embedded with a plurality of molding blocks 1, a molding groove 1 for molding a small rib is arranged in the middle of the molding block, the lower mold is further provided with a plurality of molding blocks 2, the molding blocks 2 are provided with molding grooves 2 for molding the small rib, an ejection rod 1 is arranged at the bottom of the molding block 1, an ejection rod 2 is also embedded in the lower mold, the ejection plate drives the ejection rod 1 and the ejection rod 2 to move, the molding block 1 is arranged, and the ejection of the molding block 1 is controlled by the ejection plate, so that the ejection area is increased, so that the problem of ejection damage is not easy to occur when the cover body is ejected, and the ejection is divided into two times, so that the problem of mold sticking is reduced when the ejection rod 2 is ejected, and the probability of damaging the cover body is reduced.

Description

Technical Field

[0001] The utility model relates to a mould, in particular to a secondary ejection injection mould for a plastic decorative cover. Background Art

[0002] like Figure 1 As shown, a plastic decorative cover for an automobile includes a cover body 90, a large rib 91 is arranged at the bottom of the cover body 90, a plurality of small ribs 92 are arranged between the large rib 91 and the cover body 90, and a connecting plate 93 is also arranged at the side end, and a connecting hole 94 is opened on the connecting plate 93.

[0003] The cover plate body 90 is usually formed by an injection mold. In the ejection step after the molding is completed, there are too many small ribs 92, and the small ribs 92 are arranged closely with small gaps and small thickness, resulting in a large contact area between the small ribs 92 and the mold. The problem of mold sticking is prone to occur during the demolding process. The usual solution is to set a plurality of small ejector pins between the small ribs 92 and push against the bottom of the groove between the small ribs 92 for ejection. However, the structural strength of the small ejector pins themselves is low, and the cost of processing a plurality of slender and high-strength ejector pins is high. At the same time, the cover plate body 90 is thin, and the contact area between the small ejector pins and the cover plate body 90 is small. When the mold sticking is more serious, the cover plate body 90 is easily damaged, resulting in poor ejection stability of the product. Utility Model Content

[0004] In view of this, the utility model aims to provide a secondary ejection injection mold for a plastic decorative cover, which has the advantages of low cost and stable ejection.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a secondary ejection injection mold for a plastic decorative cover, comprising a top plate, an upper mold, a lower mold, an ejector plate and a bottom plate, the lower mold is embedded with a plurality of molding blocks 1, a molding groove 1 for molding small ribs is provided in the middle of the molding block, the lower mold is also provided with a plurality of molding blocks 2, the molding blocks 2 are provided with molding grooves 2 for molding small ribs, an ejector rod 1 is provided at the bottom of the molding block 1, and an ejector rod 2 is also embedded in the lower mold, and the ejector plate drives the ejector rod 1 and the ejector rod 2 to move.

[0006] Through the above technical means, by setting the forming block one and controlling the ejection of the forming block one through the ejection plate, the ejection area is increased, so that the cover plate body is not prone to damage when it is ejected. At the same time, it is divided into two ejection times, which reduces the problem of mold sticking when the ejection rod 2 is ejected, and reduces the probability of damaging the cover plate body.

[0007] Preferably, two cavities for forming the cover plate body are arranged between the upper mold and the lower mold, three forming blocks 1 are arranged in the cavities respectively, a forming groove 1 is opened on each forming block 1, and a forming groove 3 for forming a small rib is arranged between one side end of the forming block and the adjacent forming block 2.

[0008] Through the above technical means, the molding groove three is formed between the molding block one and the molding block two, so as to share the mold sticking area of ​​the first ejection and the second ejection, and reduce the possibility of mold sticking when the ejector rod two is ejected.

[0009] Preferably, the ejector plate includes ejector plate 1 and ejector plate 2, the ejector rod 2 is fixedly connected to the ejector plate 2, a through hole is formed on the ejector plate 1, a false top sleeve is arranged in the through hole, a countersunk hole is formed on the bottom plate, a limiting ring is provided at the bottom of the false top sleeve, the limiting ring is slidably arranged in the countersunk hole, a support plate is detachably provided at the bottom of the bottom plate, a spring is further arranged between the false top sleeve and the support plate, the ejector rod 1 is fixedly arranged at the top end of the false top sleeve, and a through hole for the ejector rod 1 to pass through is formed on the ejector plate 2.

[0010] Through the above technical means, the ejection distance of the forming block 1 is controlled by the cooperation between the countersunk hole and the limit ring, and the false ejector sleeve is pressed upward by the spring to achieve false secondary ejection, thereby eliminating the complex structure of the separate drive of the ejector plate 1 and the ejector plate 2 and reducing the production cost of the mold.

[0011] Preferably, the lower mold includes a base mold and an insert mold, the molding block 2 is arranged on the base mold, the insert mold is provided with an inclined top groove, a inclined top block for forming connecting holes is arranged in the inclined top groove, and a cavity for forming connecting plates and connecting holes is formed between the inclined top block and the insert mold.

[0012] Through the above technical means, the base mold and the insert mold are manufactured separately, thereby reducing the production cost and facilitating the processing of the cavity for forming the connecting plate and the connecting hole.

[0013] Preferably, the ejection plate is provided with clamping plates, a rotating block is hinged between the clamping plates, an inclined ejector rod is fixedly provided at the tail of the inclined ejector block, and the inclined ejector rod is fixedly connected to the rotating block.

[0014] Through the above technical means, the inclined ejector rod is connected with the rotating block, and the rotating block and the clamping plate are hinged, so that the inclined ejector block can automatically complete the core pulling during the ejection process.

[0015] Preferably, an annular hole is provided at the bottom of the lower mold, and a self-lubricating ring is also sleeved on the inclined ejector rod, and the self-lubricating ring is arranged in the annular hole. A limiting block is fixedly provided at the bottom of the lower mold, and the limiting block presses against the self-lubricating ring and fixes it in the annular hole. A flat groove is provided at the side end of the inclined ejector rod, and the limiting block is slidably connected to the flat groove.

[0016] Through the above technical means, by arranging the self-lubricating ring on the inclined ejector rod, the sliding friction of the inclined ejector rod is reduced, the accuracy of core pulling is increased, and the self-lubricating ring is supported by the limit block, which facilitates the inspection and replacement of the self-lubricating ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the cover plate body;

[0018] Figure 2 It is a structural schematic diagram of an embodiment;

[0019] Figure 3 A partial schematic diagram of an embodiment Figure 1 ;

[0020] Figure 4 for Figure 3 A magnified view of part A;

[0021] Figure 5 A cross-sectional view of an embodiment Figure 1 ;

[0022] Figure 6 for Figure 5 A partial schematic diagram of

[0023] Figure 7 A cross-sectional view of an embodiment Figure 2 ;

[0024] Figure 8 A partial schematic diagram of an embodiment Figure 2 .

[0025] 1. The axial direction of the present invention is as follows: 1. The axial direction of the present invention is as follows: 1. The axial direction of the present invention is as follows: 2. The axial direction of the present invention is as follows: 3. The axial direction of the present invention is as follows: 4. The axial direction of the present invention is as follows: 5. The axial direction of the present invention is as follows: 6. The axial direction of the present invention is as follows: 7. The axial direction of the present invention is as follows: 8. The axial direction of the present invention is as follows: 9. The axial direction of the present invention is as follows: 1. The axial direction of the present invention is as follows: 1. The axial direction of the present invention is as follows: 2. The axial direction of the present invention is as follows: 3. The axial direction of the present invention is as follows: 4. The axial direction of the present invention is as follows: 5. The axial direction of the present invention is as follows: 6. The axial direction of the present invention is as follows: 7. The axial direction of the present invention is as follows: 8. The axial direction of the present invention is as follows: 9. The axial direction of the present invention is as follows: 1. The axial direction of the present invention is as follows: DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0027] A secondary ejection injection mold for a plastic decorative cover, comprising a top plate 1, an upper mold 2, a lower mold 3, an ejection plate 4 and a bottom plate 5. Two cavities for molding a cover body 90 are arranged between the upper mold 2 and the lower mold 3. During injection molding, the product is one out of two. A plurality of molding blocks 6 are embedded in the lower mold 3. A molding groove 7 for molding a small rib 92 is arranged in the middle of the molding block. A plurality of molding blocks 8 are also arranged on the lower mold 3. A plurality of molding grooves 9 for molding the small rib 92 are arranged on the molding block 8. The bottom of the molding block 6 has a plurality of molding grooves 9 for molding the small rib 92. The lower mold 3 is provided with an ejector rod 10, and the lower mold 3 is also embedded with an ejector rod 2 11. The ejector plate 4 drives the ejector rod 10 and the ejector rod 2 11 to move. Through the ejection of the forming block 6, the force area during ejection is increased to prevent the ejector rod 2 11 from damaging the cover plate body 90. After the forming block 6 is ejected, the ejector rod 2 11 can be ejected for the second time to complete the demoulding. When the ejector rod 2 11 is ejected for the first time, the cover plate body 90 is only in contact with the forming block 6, and the contact area is reduced. Even if mold sticking occurs, the probability of cover plate damage can be reduced.

[0028] Three molding blocks 6 are respectively arranged in the separate cavities, each of which is provided with a molding groove 7. A molding groove 3 12 for molding a small rib 92 is arranged between the side end of the molding block 6 and the adjacent molding block 2 8, so that when the molding block 6 is ejected, one side of the molding groove 3 12 is separated from the molding block 2 8, thereby increasing the force-bearing area during ejection and minimizing the mold sticking area during secondary ejection.

[0029] The ejector plate 4 includes an ejector plate 41 and an ejector plate 42. The injection molding machine drives the ejector plate 41 and the ejector plate 42 to move together. The ejector rod 2 11 is fixedly connected to the ejector plate 42. A through hole 15 is provided on the ejector plate 41, and a false top sleeve 16 is provided in the through hole 15. A countersunk hole 17 is provided on the bottom plate 5. A limiting ring 18 is provided at the bottom of the false top sleeve 16. The limiting ring 18 is slidably arranged in the countersunk hole 17. A support plate 19 is also detachably arranged at the bottom of the bottom plate 5 by screws. A spring 20 is also arranged between the false top sleeve 16 and the support plate 19. The ejector rod 10 is fixedly arranged at the top of the false top sleeve 16. A through hole 15 is provided on the ejector plate 42 for the ejector rod 10 to pass through. The diameter of the through hole 21 is smaller than the diameter of the false top sleeve 16. When the ejection plate 4-1 and the ejection plate 4-2 move upward for ejection, the spring 20 drives the false top sleeve 16 to move upward. At this time, the ejection rod 10 drives the forming block 16 to move upward, and the ejection rod 2 11 moves upward to eject the cover plate body 90. When the limit ring 18 abuts against the bottom surface of the countersunk hole 17, the ejection rod 10 and the forming block 16 stop moving upward, and the ejection rod 2 11 continues to move upward to make the cover plate body 90 separate from the forming block 16, thereby completing the ejection. When the ejection plate 4-1 and the ejection plate 4-2 are retracted, the ejection plate 4-2 abuts against the false top sleeve 16 to move downward and compress the spring 20, thereby completing the energy storage of the spring 20.

[0030] The lower mold 3 includes a base mold 22 and an insert mold 23, a molding block 28 is arranged on the base mold 22, an inclined top groove 24 is opened on the insert mold 23, an inclined top block 25 for forming a connecting hole 94 is arranged in the inclined top groove 24, an inclined top rod 26 is fixedly arranged at the tail of the inclined top block 25, the inclined top rod 26 passes through the base mold 22, and a cavity for forming a connecting plate 93 and a connecting hole 94 is formed between the inclined top block 25 and the insert mold 23, a clamping plate 27 is arranged on the ejection plate 4, a rotating block 28 is hinged between the clamping plates 27, and the inclined top rod 26 is fixedly connected to the rotating block 28. When the ejection plate 4 moves upward, the inclined top rod 26 moves in the inclined direction, thereby automatically completing the core pulling of the connecting plate 93 and the connecting hole 94.

[0031] A ring hole 29 is provided at the bottom of the lower mold 3, and a self-lubricating ring 30 is also sleeved on the inclined ejector rod 26. The self-lubricating ring 30 is arranged in the ring hole 29. A limit block 31 is fixedly provided at the bottom of the lower mold 3. The limit block 31 resists the self-lubricating ring 30 and fixes it in the ring hole 29. A flat groove 32 is provided at the side end of the inclined ejector rod 26. The limit block 31 is slidably connected to the flat groove 32. By sleeved the self-lubricating ring 30 on the inclined ejector rod 26, the sliding friction force of the inclined ejector rod 26 is reduced, the accuracy of core pulling is increased, and the self-lubricating ring 30 is resisted by the limit block 31, which facilitates the inspection and replacement of the self-lubricating ring 30.

[0032] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A secondary ejection injection mold for a plastic decorative cover, comprising a top plate (1), an upper mold (2), a lower mold (3), an ejection plate (4) and a bottom plate (5), wherein: The lower mold (3) is embedded with a plurality of molding blocks (6), a molding groove (7) for molding a small rib (92) is provided in the middle of the molding block, the lower mold (3) is also provided with a plurality of molding blocks (8), a molding groove (9) for molding a small rib (92) is provided on the molding block (8), an ejector rod (10) is provided at the bottom of the molding block (6), and an ejector rod (11) is also embedded in the lower mold (3), and the ejector plate (4) drives the ejector rod (10) and the ejector rod (11) to move.

2. The secondary ejection injection mold for a plastic decorative cover according to claim 1, characterized in that: Two cavities for molding the cover plate body (90) are arranged between the upper mold (2) and the lower mold (3), and three molding blocks (6) are respectively arranged in the cavities. Each molding block (6) is provided with a molding groove (7), and a molding groove (12) for molding a small rib plate (92) is arranged between the side end of the molding block (6) and the adjacent molding block (8).

3. The secondary ejection injection mold for a plastic decorative cover according to claim 1, characterized in that: The ejector plate (4) comprises an ejector plate (4) 1 and an ejector plate (4) 2. The ejector rod (11) is fixedly connected to the ejector plate (4) 2. A through hole (15) is provided on the ejector plate (4) 1. A false top sleeve (16) is provided in the through hole (15). A countersunk hole (17) is provided on the bottom plate (5). A limiting ring (18) is provided at the bottom of the false top sleeve (16). The limiting ring (18) is slidably provided in the countersunk hole (17). A support plate (19) is detachably provided at the bottom of the bottom plate (5). A spring (20) is also provided between the false top sleeve (16) and the support plate (19). The ejector rod (10) is fixedly provided at the top of the false top sleeve (16). The ejector plate (4) 2 is provided with a through hole (21) for the ejector rod (10) to pass through.

4. The secondary ejection injection mold for a plastic decorative cover according to claim 1, characterized in that: The lower mold (3) comprises a base mold (22) and an insert mold (23); the second molding block (8) is arranged on the base mold (22); the insert mold (23) is provided with an inclined top groove (24); an inclined top block (25) for molding a connecting hole (94) is arranged in the inclined top groove (24); a cavity for molding a connecting plate (93) and a connecting hole (94) is formed between the inclined top block (25) and the insert mold (23).

5. The secondary ejection injection mold for a plastic decorative cover according to claim 4, characterized in that: The ejection plate (4) is provided with a clamping plate (27), a rotating block (28) is hinged between the clamping plates (27), a tilting ejector rod (26) is fixedly provided at the tail of the tilting ejector block (25), and the tilting ejector rod (26) is fixedly connected to the rotating block (28).

6. The secondary ejection injection mold for a plastic decorative cover according to claim 5, characterized in that: The bottom of the lower mold (3) is provided with an annular hole (29), the inclined ejector rod (26) is also sleeved with a self-lubricating ring (30), the self-lubricating ring (30) is arranged in the annular hole (29), a limiting block (31) is fixedly arranged at the bottom of the lower mold (3), the limiting block (31) abuts against the self-lubricating ring (30) and fixes it in the annular hole (29), a flat groove (32) is provided at the side end of the inclined ejector rod (26), and the limiting block (31) is slidably connected to the flat groove (32).

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