Injection mold with inverted ejector pin structure

Abstract

The present invention discloses an injection mold with an inverted ejector structure, characterized in that: the mold comprises a fixed mold mounting plate (1), one side of the fixed mold mounting plate (1) is connected in sequence with a discharge plate (2), a flow channel plate (3), a first extraction pad plate (4), a first extraction plate (5), an ejector pad plate (6) and an ejector fixing plate (7), a side of the ejector fixing plate (7) is also provided with an A plate (8), the mold further comprises a square iron (9), one side of the square iron (9) is provided with a B plate (10) matched with the A plate (8), a fixed mold insert is provided in the A plate (8), a movable mold insert is provided in the B plate (10), the fixed mold insert and the movable mold insert can form a cavity together when the mold is closed, a first pull plate (11) is provided between the ejector fixing plate (7) and the B plate (10), and a second pull plate (12) is provided between the discharge plate (2) and the flow channel plate (3).

Description

Technical Field

[0001] The invention relates to the field of injection molding, in particular to an injection mold with an inverted ejector pin structure. Background Art

[0002] Injection molding is a method of producing industrial products, which is mainly achieved by using a molding machine and a matching mold. The process is to inject thermoplastics or thermosetting materials into the mold to form plastic products of various shapes. After the product is formed, the fixed mold part and the movable mold part of the mold are separated, and the product is exposed to the air. The ejector and ejector mechanism set in the movable mold side are used to eject the product from the mold cavity to achieve demolding. However, due to the special shape of some products, if the ejector mechanism is set in the movable mold side like a traditional mold, it may cause the product to be difficult to demold. Therefore, a method or device that can solve the above problem is now needed. Summary of the invention

[0003] The present invention aims to solve the above-mentioned deficiencies in the prior art and proposes an injection mold with a simple structure, ingenious design, reasonable layout, and an ejector mechanism that can be arranged on the fixed mold side and an inverted ejector rod structure that can smoothly realize the ejection action.

[0004] The technical solution of the present invention is: an injection mold with an inverted ejector structure, characterized in that: the mold comprises a fixed mold mounting plate 1, one side of the fixed mold mounting plate 1 is sequentially connected with a discharge plate 2, a flow channel plate 3, a first extraction pad plate 4, a first extraction plate 5, an ejector pad plate 6 and an ejector fixing plate 7, an A plate 8 is also provided on the side of the ejector fixing plate 7, the mold further comprises a square iron 9, one side of the square iron 9 is provided with a B plate 10 matched with the A plate 8, a fixed mold insert is provided in the A plate 8, a movable mold insert is provided in the B plate 10, the fixed mold insert and the movable mold insert can form a cavity together when the mold is closed, a first pull plate 11 is provided between the ejector fixing plate 7 and the B plate 10, a second pull plate 12 is provided between the discharge plate 2 and the flow channel plate 3,

[0005] A workpiece ejector 13 is provided on the ejector fixing plate 7, and a needle 14 and a slider seat ejector 15 are also provided on the ejector pad 6. The end of the slider seat ejector 15 contacts the slider seat 16. The slider seat 16 is slidably connected in a slider seat groove 17 provided on the A plate 8. A slider guide groove 18 is provided in the slider seat 16. A core-pulling slider 19 is slidably connected in the slider guide groove 18. An inclined guide column 20 is also fixedly provided in the A plate. The inclined guide column 20 is slidably connected to the inclined guide groove provided on the core-pulling slider 19. At the same time, the inclined guide column 20 and the slider seat 16 do not interfere with each other. A reset ejector 22 is connected to the B plate through a reset spring 21. The positions of the reset ejector 22 and the slider seat 16 match each other.

[0006] A damping bolt 23 is provided between the ejector pad 6 and the first extraction plate 5, and an A plate spring 24 is also provided between the ejector fixing plate 7 and the A plate 8. A limiting screw 25 is provided between the unloading plate 2 and the flow channel plate 3. At the same time, a guide column 26 is provided on the unloading plate 2. A step portion is provided at the end of the guide column 26. The step portion is provided in the sink groove provided on the fixed mold mounting plate 1. The guide column 26 matches the guide holes provided on the A plate 8 and the B plate 10. A limiting column 27 matching the A plate 8 is also provided on the ejector fixing plate 7.

[0007] After the limiting column 27 contacts the A plate 8 and prevents the first-pull-out plate 5 and the first-pull-out pad 4 from moving further, when the pulling force is greater than the friction force of the damping bolt 23, the push rod pad 6 and the first-pull-out plate 5 are separated, and the workpiece push rod 13 set on the push rod fixing plate 7 is ejected, the product moves relative to the inserting pin 14 and is separated from the inserting pin 14, and the product is completely demolded.

[0008] Compared with the prior art, the present invention has the following advantages:

[0009] This type of injection mold with an inverted ejector structure has a simple structure, ingenious design, and reasonable layout. It is designed to solve the problem that the ejector structure located on the movable mold side is difficult to achieve smooth ejection when the traditional injection mold is performing injection molding operations on workpieces of certain special shapes or structures. First of all, it creatively designs the ejector structure on the side of the fixed mold part, and also designs a special slider structure to achieve a core pulling action with a certain angle. The combination of the above two structures can, on the one hand, ensure that the ejector structure installed on the side of the fixed mold part can work normally and smoothly realize the ejection action of the product, and on the other hand, it also takes into account the smooth progress of the core pulling action, thereby ensuring that the injection molding operation of certain special shapes and structures can be carried out smoothly. In addition, the manufacturing process of the mold is simple and the manufacturing cost is low. Therefore, it can be said that it has many advantages and is particularly suitable for promotion and application in this field. Its market prospects are very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of an embodiment of the present invention in a mold closing state.

[0011] Figures 2 to 6 Schematic diagram of the mold opening process of an embodiment of the present invention.

[0012] Figure 7 yes Figure 4 Enlarged view of part A in .

[0013] Figure 8 yes Figure 6 Enlarged view of part B in .

[0014] Fig. 9It is a schematic structural diagram of the push rod pad and push rod fixing plate in an embodiment of the present invention.

[0015] Fig.10 It is a schematic diagram of the structure of each plate material on the fixed mold side in an embodiment of the present invention.

[0016] Fig.11 It is a schematic structural diagram of the slider seat portion in an embodiment of the present invention (the core-pulling slider is not shown).

[0017] Fig.12 It is a schematic structural diagram of the slider seat portion (with a core-pulling slider) in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention will be described below with reference to the accompanying drawings. Figures 1 to 12 As shown: an injection mold with an inverted ejector structure, which includes a fixed mold mounting plate 1, one side of which is sequentially connected with a stripper plate 2, a flow channel plate 3, a first extraction pad plate 4, a first extraction plate 5, an ejector pad plate 6 and an ejector fixing plate 7, and an A plate 8 is also provided on the side of the ejector fixing plate 7. The mold also includes a square iron 9, one side of the square iron 9 is provided with a B plate 10 matched with the A plate 8, a fixed mold insert is provided in the A plate 8, a movable mold insert is provided in the B plate 10, and the fixed mold insert and the movable mold insert can form a cavity together when the mold is closed, a first pull plate 11 is provided between the ejector fixing plate 7 and the B plate 10, and a second pull plate 12 is provided between the stripper plate 2 and the flow channel plate 3,

[0019] A workpiece ejector 13 is provided on the ejector fixing plate 7, and a needle 14 and a slider seat ejector 15 are also provided on the ejector pad 6. The end of the slider seat ejector 15 contacts the slider seat 16. The slider seat 16 is slidably connected in a slider seat groove 17 provided on the A plate 8. A slider guide groove 18 is provided in the slider seat 16. A core-pulling slider 19 is slidably connected in the slider guide groove 18. An inclined guide column 20 is also fixedly provided in the A plate. The inclined guide column 20 is slidably connected to the inclined guide groove provided on the core-pulling slider 19. At the same time, the inclined guide column 20 and the slider seat 16 do not interfere with each other. A reset ejector 22 is connected to the B plate through a reset spring 21. The positions of the reset ejector 22 and the slider seat 16 match each other.

[0020] A damping bolt 23 is provided between the ejector pad 6 and the first extraction plate 5, and an A plate spring 24 is also provided between the ejector fixing plate 7 and the A plate 8. A limiting screw 25 is provided between the unloading plate 2 and the flow channel plate 3. At the same time, a guide column 26 is provided on the unloading plate 2. A step portion is provided at the end of the guide column 26. The step portion is provided in the sink groove provided on the fixed mold mounting plate 1. The guide column 26 matches the guide holes provided on the A plate 8 and the B plate 10. A limiting column 27 matching the A plate 8 is also provided on the ejector fixing plate 7.

[0021] After the limiting column 27 contacts the A plate 8 and prevents the first-pull-out plate 5 and the first-pull-out pad 4 from moving further, when the pulling force is greater than the friction force of the damping bolt 23, the push rod pad 6 and the first-pull-out plate 5 are separated, and the workpiece push rod 13 set on the push rod fixing plate 7 is ejected, the product moves relative to the inserting pin 14 and is separated from the inserting pin 14, and the product is completely demolded.

[0022] The working process of the injection mold with an inverted ejector pin structure of the embodiment of the present invention is as follows: when the mold is closed, the fixed mold core in the A plate 8 and the movable mold core in the B plate 9 are combined to form a cavity, and the molding machine pours the molten material into the cavity, and the material is cooled to form a product (such as Figure 1 shown);

[0023] After the product is formed, the movable mold side moves away from the fixed mold side under the drive of the molding machine. Under the action of the limit screw 25 and the spring on it, the unloading plate 2 and the flow channel plate 3 are opened first. At this time, the handle part in the flow channel is separated from the formed product (such as Figure 2 shown);

[0024] Then the A plate 8 and the B plate 10 are separated, that is, the parting surface is opened, and the product is exposed to the air. Since the end of the insert pin 14 is inserted into the cavity to participate in the molding during the molding process, the insert pin 14 is connected to the product (inserted into the product), that is, the product is left at the A plate 8 on the fixed mold side (such as Figure 3 shown);

[0025] The movable mold side continues to move, and when the limit distance of the first pull plate 11 is reached, the space between the unloading plate 2 and the flow channel plate 3 is opened, and the material handle remaining in the flow channel is pulled out, realizing the action of removing the material handle (such as Figure 4 shown);

[0026] When the limit distance of the second pull plate 12 is reached, the distance between the unloading plate 2 and the flow channel plate 3 no longer increases. Under the action of the pulling force, the A plate spring 24 arranged between the ejector fixing plate 7 and the A plate 8 is compressed (at this time, the meson on the guide column 26 blocks the movement of the A plate 8), that is, the ejector fixing plate 7 and the A plate 8 move toward each other, so that the slider seat ejector 15 connected to the ejector fixing plate 7 will be ejected toward the movable mold side (such as Figure 5As shown in the figure, the slider seat push rod 15 will push the slider seat 16 to move, and the slider seat 16 will slide in the slider seat groove 17, driving the core-pulling slider 19 therein to move relative to the A plate 8. Since the inclined guide column 20 slidably connected to the core-pulling slider 19 is fixedly connected to the A plate 8, when the core-pulling slider 19 moves, it will move under the guidance of the inclined guide column 20, and the core-pulling action will move along the axial direction of the slider guide groove 18 where the core-pulling slider 19 is located, thereby realizing an oblique side core-pulling action;

[0027] The mold opening action continues. After the limit column 27 contacts the A plate 8, the first-drawn plate 5 and the first-drawn pad plate 4 cannot move further. When the pulling force is greater than the friction force of the damping bolt 23, the push rod pad plate 6 and the first-drawn plate 5 are separated, and the workpiece push rod 13 set on the push rod fixing plate 7 is ejected. The product moves relative to the insert pin 14 and separates from the insert pin 14. At this time, the product is completely demoulded (such as Figure 6 shown);

[0028] When the mold is re-closed, when the pulling force given by the first pulling plate 11 is cancelled, the A-plate spring 24 ensures that the ejector plate 6 and the ejector fixing plate 7 are restored to the fitting state with the first extraction plate 5 and the first extraction plate 4 and continue to reset, and the reset ejector 22 can push the slider seat 16 back into the slider seat groove 17, and all the mechanisms are reset and returned to the state as shown. Figure 1 The mold closing state shown is waiting for the mold opening operation after the next injection molding.

Claims

1. An injection mold with an inverted ejector pin structure, characterized in that: The mold comprises a fixed mold mounting plate (1), one side of which is connected in sequence to a discharge plate (2), a flow channel plate (3), a first extraction pad plate (4), a first extraction plate (5), a push rod pad plate (6) and a push rod fixing plate (7), a side of the push rod fixing plate (7) is also provided with an A plate (8), the mold further comprises a square iron (9), one side of the square iron (9) is provided with a B plate (10) matching the A plate (8), a fixed mold insert is provided in the A plate (8), a movable mold insert is provided in the B plate (10), the fixed mold insert and the movable mold insert can form a cavity together when the mold is closed, a first pull plate (11) is provided between the push rod fixing plate (7) and the B plate (10), and a second pull plate (12) is provided between the discharge plate (2) and the flow channel plate (3), A workpiece push rod (13) is arranged on the push rod fixing plate (7), and a pin (14) and a slider seat push rod (15) are also arranged on the push rod pad plate (6). The end of the slider seat push rod (15) contacts the slider seat (16). The slider seat (16) is slidably connected in a slider seat groove (17) provided on the A plate (8). A slider guide groove (18) is provided in the slider seat (16). A core pulling slider (19) is slidably connected in the slider guide groove (18). An inclined guide column (20) is also fixedly arranged in the A plate. The inclined guide column (20) is slidably connected to the inclined guide groove provided on the core pulling slider (19). At the same time, the inclined guide column (20) and the slider seat (16) do not interfere with each other. A reset push rod (22) is connected to the B plate via a reset spring (21). The positions of the reset push rod (22) and the slider seat (16) match each other. A damping bolt (23) is provided between the ejector pad (6) and the first extraction plate (5), and an A plate spring (24) is also provided between the ejector fixing plate (7) and the A plate (8). A limiting screw (25) is provided between the discharge plate (2) and the flow channel plate (3). At the same time, a guide column (26) is provided on the discharge plate (2). A step portion is provided at the end of the guide column (26). The step portion is provided in a sink groove provided on the fixed mold mounting plate (1). The guide column (26) matches the guide holes provided on the A plate (8) and the B plate (10). A limiting column (27) matching the A plate (8) is also provided on the ejector fixing plate (7). After the limiting column (27) contacts the A plate (8) so that the first-pull plate (5) and the first-pull pad plate (4) cannot move further, when the pulling force is greater than the friction force of the damping bolt (23), the push rod pad plate (6) and the first-pull plate (5) are separated, the workpiece push rod (13) arranged on the push rod fixing plate (7) is ejected, the product moves relative to the insert pin (14) and is separated from the insert pin (14), and the product is completely demoulded.

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