Ejection mechanism and injection mold

Abstract

The utility model discloses an ejection mechanism and an injection mold, which are used for ejecting injection products, and comprise a mold core, a straight ejection mechanism and an inclined ejection mechanism which are arranged on the mold core, and an ejector plate for pushing the straight ejection mechanism and the inclined ejection mechanism to move, the straight ejection mechanism comprises a straight ejection column and a straight ejection rod movably connected with the straight ejection column, the inclined ejection mechanism comprises an inclined ejection column, an inclined ejection rod movably connected with the inclined ejection column and a lower end of a straight ejection rod, the lower end of the inclined ejection rod abuts against the ejector plate, the mold core is provided with a vertical straight ejection hole and an inclined ejection hole, the inclined ejection hole and the straight ejection hole are arranged at intervals, the straight ejection column is movably arranged in the straight ejection hole, and the inclined ejection column is movably arranged in the inclined ejection hole. And an included angle alpha is formed between the axis of the straight ejection column and the axis of the inclined ejection column and is more than 0 degree and less than or equal to 10 degrees.

Description

Technical Field

[0001] The utility model relates to the field of plastic product injection molding, in particular to an ejection mechanism and an injection mold. Background Art

[0002] With the rapid development of the plastics industry and the continuous improvement of general and engineering plastics in terms of strength and precision, the application scope of plastic products is also expanding. Therefore, the application of injection molds is becoming more and more extensive.

[0003] As the requirements for the shape and function of injection molded products become higher and higher and their characteristics become more diverse, the structure of injection molds has become more and more complex. At present, injection molded products are usually designed with an undercut structure. Injection molds generally eject the injection molded products through the existing inclined ejector mechanism to enable smooth demoulding of the injection molded products.

[0004] However, when the head of the inclined ejector mechanism is undercut and cannot be demolded, the existing inclined ejector mechanism still has problems such as easy sticking to the mold when ejecting the injection molded product, and the injection molded product is difficult to remove, and even the injection molded product cannot be demolded. Therefore, a new structure or new technology is urgently needed to solve the above problems. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide an ejection mechanism and an injection mold for solving the problem of smooth demoulding of injection molded products with an undercut structure.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an ejection mechanism for ejecting injection molded products from an injection mold, comprising a mold core, a straight ejection mechanism and an inclined ejection mechanism installed on the mold core, and an ejector plate for pushing the straight ejection mechanism and the inclined ejection mechanism to move, the straight ejection mechanism comprising a straight ejection column and a straight ejection rod movably connected to the straight ejection column, the inclined ejection mechanism comprising an inclined ejection column and an inclined ejection rod movably connected to the inclined ejection column, the lower ends of the straight ejection rod and the lower ends of the inclined ejection rod abut against the ejector plate, the mold core is provided with a vertically arranged straight ejection hole and an obliquely arranged oblique ejection hole, the oblique ejection hole is spaced from the straight ejection hole, the straight ejection column is movably arranged in the straight ejection hole, the inclined ejection column is movably arranged in the inclined ejection hole, the axis of the straight ejection column forms an angle α with the axis of the inclined ejection column, and the angle 0°<α≤10°.

[0007] Furthermore, the angle α is 5°.

[0008] Furthermore, the ejection mechanism also includes an accelerating ejector mechanism, which includes an accelerating ejector and a rotating arm. The mold core is provided with an accelerating ejector hole for accommodating the accelerating ejector. The rotating arm is rotatably arranged on the ejector plate. The lower end of the accelerating ejector abuts against one end of the rotating arm. When the other end of the rotating arm is triggered, the rotating arm rotates around a first direction, and the one end of the rotating arm abuts against the accelerating ejector to generate displacement.

[0009] Furthermore, the accelerating ejector mechanism also includes a triggering ejector and a spring, wherein the triggering ejector abuts against the other end of the rotating arm, and the spring is sleeved on the periphery of the accelerating ejector. When the ejection mechanism is reset, the spring pushes the one end of the rotating arm under the action of elastic force to cause the rotating arm to rotate in the second direction, and the accelerating ejector is reset.

[0010] Further, the ejector plate includes a first ejector plate and a second ejector plate which are stacked up and down, the first ejector plate is provided with a movable hole corresponding to the trigger ejector and the acceleration ejector, the trigger ejector and the acceleration ejector pass through the movable hole, the second ejector plate is provided with a movable groove corresponding to the rotating arm, the rotating arm is rotatably arranged in the movable groove, the lower end of the acceleration ejector is provided with an abutment portion protruding outwardly, and the two ends of the spring respectively abut against the lower surface of the first ejector plate and the upper surface of the abutment portion.

[0011] Furthermore, two opposite side surfaces of the rotating arm are convexly provided with a rotating shaft, the rotating arm rotates around the rotating shaft, the movable groove is concavely provided with an extension groove connected to the movable groove corresponding to the rotating shaft, and the rotating shaft is arranged in the extension groove.

[0012] Furthermore, the ejection mechanism also includes an ejector pin, the mold core is provided with an ejector pin hole for accommodating the ejector pin, the ejector pin hole vertically penetrates the mold core and is spaced apart and parallel to the straight ejector hole, and the lower end of the ejector pin abuts against the ejector pin plate.

[0013] Furthermore, two opposite side surfaces of the inclined top column are convexly provided with guide parts, and the inner wall of the inclined top hole is concavely provided with guide grooves corresponding to the guide parts, and the guide parts are slidably arranged in the guide grooves.

[0014] Furthermore, the guide portion is arranged obliquely and extends along the oblique extension direction of the inclined roof column.

[0015] An injection mold comprises an upper mold and a lower mold, wherein the upper mold comprises an upper fixed plate, an upper connecting plate and an upper mold plate which are arranged in sequence from top to bottom, and the lower mold comprises a lower fixed plate, a lower connecting plate and a lower mold plate which are arranged in sequence from bottom to top, and the ejector plate is located between the lower fixed plate and the lower mold plate. The injection mold also comprises the above-mentioned ejector mechanism, which is arranged on the lower mold plate and at least part of the ejector mechanism passes through the lower mold plate and abuts against the ejector plate. The upper mold plate, the lower mold plate and the ejector mechanism together form an injection mold cavity for an injection molded product.

[0016] The ejection mechanism and injection mold provided by the utility model solve the problem of smooth demoulding of injection molded products whose undercut structure is located at the head position of the undercut structure by arranging the straight ejection mechanism and the inclined ejection mechanism, and effectively solve the problem of demoulding failure caused by adhesion during demoulding of injection molded products by arranging the accelerating ejector mechanism. The utility model not only solves the problem of smooth demoulding of injection molded products with undercut structures, but also greatly improves the production efficiency and the yield rate of injection molded products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a cross-sectional view of the injection mold of the utility model.

[0019] Figure 2 for Figure 1 A partial enlarged view of point A of the injection mold shown.

[0020] Figure 3 It is a three-dimensional diagram of a partial structure of the injection mold of the utility model.

[0021] Figure 4 for Figure 3 A partial enlarged view of point B of the injection mold shown.

[0022] Figure 5 It is a three-dimensional diagram of the ejection mechanism of the utility model.

[0023] Figure 6 for Figure 5 A three-dimensional view of the mold core of the ejection mechanism is shown.

[0024] Figure 7 for Figure 5 The three-dimensional exploded view of the straight ejection mechanism and the inclined ejection mechanism of the ejection mechanism is shown.

[0025] Figure 8 for Figure 7 The schematic diagram shows that the axis of the straight push rod and the axis of the inclined push rod form an angle α.

[0026] Fig. 9 It is a schematic diagram of the accelerating ejector mechanism of the utility model.

[0027] Fig.10 It is a schematic diagram of the accelerating ejector mechanism of the utility model being installed on the ejector plate.

[0028] Fig.11 This is a three-dimensional image of an injection molded product. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of description and simplified description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0031] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0032] See also Figure 1-Figure 11The utility model discloses an ejection mechanism 50, which is used for ejecting an injection molded product 100 having an undercut structure 101. The ejection mechanism 50 includes a mold core 51, a straight ejection mechanism 52 and an inclined ejection mechanism 53 installed on the mold core 51, and an ejector plate 40 for pushing the straight ejection mechanism 52 and the inclined ejection mechanism 53 to move. The straight ejection mechanism 52 includes a straight ejection column 521 and a straight ejection rod 522 movably connected to the straight ejection column 521. The inclined ejection mechanism 53 includes an inclined ejection column 531 and an inclined ejection rod 532 movably connected to the inclined ejection column 531. The lower end of the straight ejection rod 522 and the lower end of the inclined ejection rod 532 abut against the ejector plate 40. The mold core 51 is provided with a vertically arranged straight ejection hole 511 and an inclined ejection hole 512 arranged obliquely. The inclined ejection hole 512 is arranged at a distance from the straight ejection hole 511. The straight ejection column 521 is movably arranged in the straight ejection hole 511. The inclined top column 531 is movably disposed in the inclined top hole 512. Figure 2 and Fig. 9 The axis of the straight top column 521 and the axis of the inclined top column 531 form an angle α, and the angle 0°<α≤10°. In this embodiment, the angle α is 5°.

[0033] When the injection mold changes from a closed mold state to an open mold state, the ejector plate 40 pushes the straight ejector rod 522 and the inclined ejector rod 532 to move upward, and the straight ejector rod 522 pushes the straight ejector column 521 to move upward in the vertical direction of the straight ejector hole 511 to eject the injection molded product 100. At the same time, the inclined ejector rod 532 pushes the inclined ejector column 531 to move upward in the vertical direction of the inclined ejector hole 512 and inward in the horizontal direction synchronously, so that the inclined ejector column 531 is separated from the undercut structure and the straight ejector column 521 ejects the injection molded product 100 upward, thereby completing the demoulding of the injection molded product 100.

[0034] See also Fig.11 In this embodiment, the undercut structure 101 of the injection molded product 100 is located at the head position of the inclined top column 531. Therefore, the use of a single inclined top structure or a single straight top structure cannot achieve the action of the inclined top column 531 moving inwardly away from the injection molded product 100 and moving downwardly away from the undercut structure 101 located at the head position of the inclined top column 531 to complete smooth demolding.

[0035] Please participate Figure 4 , Figure 5 , Figure 7 and Fig.11Furthermore, a straight ejector block 5211 is protruded outwardly at the end of the straight ejector column 521. The straight ejector block 5211 is located above the inclined ejector column 531. At least part of the outer side surface of the inclined ejector column 531 is protruded outwardly by the inclined ejector block 5311. When the injection mold is closed, the outer side surface of the straight ejector block 5211 and the outer side surface of the inclined ejector block 5311 are located on the same plane or the same curved surface, and the upper surface of the straight ejector block 5211 and the upper surface of the mold core 51 are located on the same plane or the same curved surface; when the injection mold is opened, the inclined ejector block moves upward and inward to disengage from the undercut structure 101 of the injection molded product 100, and at the same time, the straight ejector block 5211 ejects the injection molded product 100 upward, thereby completing the smooth demoulding of the injection molded product 100.

[0036] See also Figure 5 , Fig. 9 and Fig.10 The ejection mechanism 50 further includes an accelerating ejector mechanism 55. The accelerating ejector mechanism 55 includes an accelerating ejector 551 and a rotating arm 553. The mold core 51 is provided with an accelerating ejector hole 514 for accommodating the accelerating ejector 551. The rotating arm 553 is rotatably disposed on the ejector plate 40. The lower end of the accelerating ejector 551 abuts against one end of the rotating arm 553. When the other end of the rotating arm 553 is triggered, the rotating arm 553 rotates around a first direction, and the one end of the rotating arm 553 abuts against the accelerating ejector 551 to generate an upward displacement and eject the injection molded product 100. In this embodiment, the function of the accelerating ejector pin 551 is to further push the accelerating ejector pin 551 with the help of the rotating arm 553 while the ejector plate 40 moves upward to push the straight ejection mechanism 52, the inclined ejection mechanism 53 and the accelerating ejector pin mechanism 55 so that the upward displacement of the accelerating ejector pin 551 in the vertical direction is greater than the upward displacement of the straight ejection mechanism 52 and the inclined ejection mechanism 53 in the vertical direction. Fig. 9 is the reference plane, and the first direction is counterclockwise.

[0037] Please continue reading Fig. 9 and Fig.10 Furthermore, the accelerating ejector mechanism 55 further includes a trigger ejector 552 and a spring 555. The trigger ejector 552 abuts against the other end of the rotating arm 553. The spring 555 is sleeved on the periphery of the accelerating ejector 551. When the ejection mechanism 50 is reset, the spring 555 pushes the one end of the rotating arm 553 under the action of elastic force to make the rotating arm rotate in the second direction, the trigger ejector 552 is pushed up, and the accelerating ejector is reset. In this embodiment, Fig. 9 is the reference plane, and the second direction is clockwise.

[0038] See also Figure 1, Figure 3 and Fig.10 , the ejector plate 40 includes a first ejector plate 41 and a second ejector plate 42 stacked up and down. The first ejector plate 41 is provided with a movable hole corresponding to the trigger ejector 552 and the acceleration ejector 551. The trigger ejector 552 and the acceleration ejector 551 pass through the movable hole. The second ejector plate 42 is provided with a movable groove 421 corresponding to the rotating arm 553. The rotating arm 553 is rotatably arranged in the movable groove 421. In more detail, the lower end of the acceleration ejector 551 is provided with an abutment portion 5511 protruding outwardly. The two ends of the spring 555 are respectively abutted against the lower surface of the first ejector plate 41 and the upper surface of the abutment portion 5511.

[0039] Please continue reading Fig. 9 and Fig.10 The rotating arm 553 is provided with a rotating shaft 554 on two opposite sides thereof. The rotating arm 553 rotates around the rotating shaft 554. The movable groove 421 is provided with an extending groove 422 corresponding to the rotating shaft 554 and connected to the movable groove 421. The rotating shaft 554 is disposed in the extending groove 422.

[0040] See also Figure 4 , Figure 5 and Figure 6 , the ejection mechanism 50 also includes an ejector pin 54. The mold core 51 is provided with an ejector pin hole 513 for accommodating the ejector pin 54. The ejector pin hole 513 vertically penetrates the mold core 51 and the ejector pin hole 513 is spaced apart and arranged in parallel with the straight ejector hole 511. The lower end of the ejector pin 54 abuts against the ejector plate 40. In this embodiment, the lower end of the ejector pin 54 abuts against the first ejector plate 41, and the lower end of the straight ejector rod 522 and the lower end of the inclined ejector rod 532 also abut against the first ejector plate 41.

[0041] See also Figure 7 and Fig.11 , the two opposite side surfaces of the inclined ejector column 531 are convexly provided with guide portions 5312. The inner wall of the inclined ejector hole 512 is concavely provided with a guide groove corresponding to the guide portion 5312. The guide portion 5312 is slidably arranged in the guide groove. In this embodiment, the guide portion 5312 is arranged at an angle and extends along the inclined extension direction of the inclined ejector column 531. Similarly, the guide groove is also arranged at an angle. When the injection mold is transformed from a mold closing state to a mold opening state, the guide portion 5312 moves upward and inward along the guide groove under the push of the ejector plate 40 and drives the inclined ejector block 5311 to detach from the undercut structure 101 of the injection molded product 100, thereby completing smooth demolding.

[0042] See also Figure 1The utility model also discloses an injection mold, including an upper mold and a lower mold, wherein the upper mold includes an upper fixing plate 80, an upper connecting plate 70 and an upper mold plate 60 arranged in sequence from top to bottom, and the lower mold includes a lower fixing plate 10, a lower connecting plate 20 and a lower mold plate 30 arranged in sequence from bottom to top, and the ejector plate 40 is located between the lower fixing plate 10 and the lower mold plate 30. The injection mold also includes an ejector mechanism 50, which is arranged on the lower mold plate 30 and at least part of the ejector mechanism 50 passes through the lower mold plate 30 and abuts against the ejector plate 40, and the upper mold plate 60, the lower mold plate 30 and the ejector mechanism 50 together enclose an injection mold cavity of the injection molded product 100.

[0043] Please continue reading Figure 1 Furthermore, the injection mold further includes a compression spring 90, and two ends of the compression spring 90 are respectively pressed against the ejector plate 40 and the lower mold plate 30.

[0044] When the injection mold changes from a mold closing state to a mold opening state, the ejector plate 40 moves upward to compress the compression spring 90 and drives the straight ejector rod 522, the inclined ejector rod 532, the ejector pin 54 and the accelerating ejector pin mechanism 55 to move upward, the straight ejector rod 522 pushes the straight ejector column 521 to extend upward from the upper surface of the mold core 51, the inclined ejector rod 532 pushes the inclined ejector column 531 to move inward and disengage from the undercut structure 101 of the injection molded product 100, the ejector pin 54 extends upward from the upper surface of the mold core 51, and when the top end of the trigger ejector pin 552 abuts against the lower surface of the lower mold plate 30, the ejector pin accelerating mechanism 55 is triggered, and the trigger ejector pin 552 pushes the other end of the rotating arm 553 to rotate the rotating arm 553 around the first direction and pushes the accelerating ejector pin 551 to accelerate and eject out of the upper surface of the mold core 51, thereby completing smooth demolding.

[0045] When the injection mold changes from an open mold state to a closed mold state, the compression spring 90 restores the elastic force to push the ejector plate 40 to move downward and reset, and the straight ejector rod 522, the inclined ejector rod 532, the ejector pin 54 and the accelerating ejector pin mechanism 55 move downward until the straight ejector block 5211 on the straight ejector column 521 is located in the same plane or the same curved surface as the upper surface of the mold core 51, the inclined ejector block 5311 on the inclined ejector column 531 moves outward and the outer surface of the inclined ejector block 5311 is located in the same plane or the same curved surface as the outer surface of the straight ejector block 5211, and the upper section of the ejector pin is located in the same plane or the same curved surface as the upper surface of the mold core 51. At the same time, the spring 555 restores the elastic force to push the accelerating ejector pin 551 to push the rotating arm 553 to rotate around the second direction and push the trigger ejector pin 552 to move upward, and then the upper mold and the lower mold are closed to produce the injection molded product 100 in the injection mold cavity.

[0046] The ejection mechanism 50 and the injection mold provided by the utility model solve the problem of smooth demoulding of the injection molded product 100 with the undercut structure 101 located at the head position of the undercut structure 101 by setting the straight ejection mechanism 52 and the inclined ejection mechanism 53; and effectively solve the problem of demoulding failure caused by adhesion during demoulding of the injection molded product 100 by setting the accelerating ejector mechanism 55. The utility model not only solves the problem of smooth demoulding of the injection molded product 100 with the undercut structure 101, but also greatly improves the production efficiency and the yield rate of the injection molded product 100.

[0047] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An ejection mechanism, used for ejecting an injection molded product from an injection mold, characterized in that: The invention comprises a mold core, a straight ejection mechanism and an inclined ejection mechanism installed on the mold core, and an ejector plate for pushing the straight ejection mechanism and the inclined ejection mechanism to move, the straight ejection mechanism comprises a straight ejection column and a straight ejection rod movably connected to the straight ejection column, the inclined ejection mechanism comprises an inclined ejection column and an inclined ejection rod movably connected to the inclined ejection column, the lower ends of the straight ejection rod and the lower ends of the inclined ejection rod abut against the ejector plate, the mold core is provided with a vertically arranged straight ejection hole and an obliquely arranged inclined ejection hole, the inclined ejection hole is spaced from the straight ejection hole, the straight ejection column is movably arranged in the straight ejection hole, the inclined ejection column is movably arranged in the inclined ejection hole, the axis of the straight ejection column forms an angle α with the axis of the inclined ejection column, and the angle 0°<α≤10°.

2. The ejection mechanism according to claim 1, characterized in that: The angle α is 5°.

3. The ejection mechanism according to claim 1, characterized in that: The ejection mechanism further includes an accelerating ejector mechanism, which includes an accelerating ejector and a rotating arm. The mold core is provided with an accelerating ejector hole for accommodating the accelerating ejector. The rotating arm is rotatably arranged on the ejector plate. The lower end of the accelerating ejector abuts against one end of the rotating arm. When the other end of the rotating arm is triggered, the rotating arm rotates around a first direction, and the one end of the rotating arm abuts against the accelerating ejector to generate displacement.

4. The ejection mechanism according to claim 3, characterized in that: The accelerating ejector mechanism further includes a triggering ejector and a spring, wherein the triggering ejector abuts against the other end of the rotating arm, and the spring is sleeved on the periphery of the accelerating ejector. When the ejection mechanism is reset, the spring pushes the one end of the rotating arm under the action of elastic force to make the rotating arm rotate in the second direction, and the accelerating ejector is reset.

5. The ejection mechanism according to claim 4, characterized in that: The ejector plate includes a first ejector plate and a second ejector plate stacked up and down, the first ejector plate is provided with a movable hole corresponding to the trigger ejector and the acceleration ejector, the trigger ejector and the acceleration ejector pass through the movable hole, the second ejector plate is provided with a movable groove corresponding to the rotating arm, the rotating arm is rotatably arranged in the movable groove, the lower end of the acceleration ejector is provided with an abutment portion protruding outwardly, and the two ends of the spring respectively abut against the lower surface of the first ejector plate and the upper surface of the abutment portion.

6. The ejection mechanism according to claim 5, characterized in that: The rotating arm has two opposite side surfaces protruding with a rotating shaft, the rotating arm rotates around the rotating shaft, the movable groove has an extending groove corresponding to the rotating shaft and connected with the movable groove, and the rotating shaft is arranged in the extending groove.

7. An ejection mechanism according to claim 1, characterized in that: The ejection mechanism also includes an ejector pin. The mold core is provided with an ejector pin hole for accommodating the ejector pin. The ejector pin hole vertically penetrates the mold core and is arranged parallel to the straight ejector hole with an interval. The lower end of the ejector pin abuts against the ejector pin plate.

8. The ejection mechanism according to claim 1, characterized in that: The two opposite side surfaces of the inclined top column are convexly provided with guiding parts, the inner wall of the inclined top hole is concavely provided with guiding grooves corresponding to the guiding parts, and the guiding parts are slidably arranged in the guiding grooves.

9. The ejection mechanism according to claim 8, characterized in that: The guide portion is arranged obliquely and extends along the oblique extension direction of the inclined roof column.

10. An injection mold, comprising an upper mold and a lower mold, wherein the upper mold comprises an upper fixing plate, an upper connecting plate and an upper mold plate arranged in sequence from top to bottom, and the lower mold comprises a lower fixing plate, a lower connecting plate and a lower mold plate arranged in sequence from bottom to top, and the ejector plate is located between the lower fixing plate and the lower mold plate, characterized in that: The injection mold further includes an ejection mechanism as described in any one of claims 1 to 9, wherein the ejection mechanism is arranged on the lower mold plate and at least a portion of the ejection mechanism passes through the lower mold plate and abuts against the ejector plate, and the upper mold plate, the lower mold plate and the ejection mechanism together form an injection mold cavity for the injection molded product.

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