Injection mold and ejection mechanism thereof

Abstract

The utility model discloses an injection mold and an ejection mechanism thereof, the injection mold comprises a movable mold plate, and further comprises a movable ejection plate, an ejection pin, an ejection pin plate matched with the ejection pin and a profiling ejection block used for ejecting an injection molding part, the movable mold plate is provided with a mounting cavity for accommodating the movable ejection plate, and the movable ejection plate is assembled in the mounting cavity in a liftable manner; the profiling ejector block is slidably assembled on a movable mold core of the movable mold plate, the end, deviating from the movable mold core, of the profiling ejector block penetrates into the mounting cavity and is fixed to the movable ejector plate, the profiling ejector block and the ejector pin are located on the upper side and the lower side of the movable ejector plate correspondingly, and the end, deviating from the ejector pin plate, of the ejector pin is movably assembled on the movable mold plate and penetrates into the mounting cavity. In this way, an ejection mechanism with a flat ejector pin in the prior art can be replaced, and the injection molding part can be normally ejected out of an injection mold.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold and an ejection mechanism thereof. Background Art

[0002] An injection mold consists of a movable platen and a fixed platen. The movable platen is mounted on the injection molding machine's movable platen via a lower fixing plate, while the fixed platen is mounted on the injection molding machine's fixed platen. For small and irregularly shaped injection molded parts, such as those with an outer diameter of 5mm, an ejector mechanism is required to eject the part from the mold during mold opening.

[0003] Currently, most ejector mechanisms with flat ejector pins are used to remove injection molded parts. However, since the flat ejector pins are small, they may break due to excessive bending during ejection. The broken flat ejector pins may remain in the mold core and cause mold compression, thereby damaging the injection mold.

[0004] In addition, some ejection mechanisms with contoured ejector blocks are used to assist in removing injection molded parts. However, the existing contoured ejector blocks are too long and easily deform after a period of use, resulting in an abnormal ejection height of the ejection mechanism, which is not conducive to the normal ejection of the injection molded parts. Utility Model Content

[0005] Therefore, in order to solve the above problems, the present invention provides an injection mold and an ejection mechanism thereof, which can replace the ejection mechanism containing flat ejector pins in the prior art to realize normal ejection of the injection molded part from the injection mold.

[0006] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0007] The utility model provides an ejection mechanism of an injection mold, comprising a movable platen, a movable ejector plate, an ejector pin, an ejector plate cooperating with the ejector pin, and a contoured ejector block for ejecting an injection molded part; the movable platen has a mounting cavity for accommodating the movable ejector plate, and the movable ejector plate can be lifted and lowered in the mounting cavity; the contoured ejector block can be slidably mounted on a movable mold core of the movable platen, and one end of the contoured ejector block facing away from the movable mold core is inserted into the mounting cavity and fixed to the movable platen; the contoured ejector block and the ejector pin are respectively located on the upper and lower sides of the movable ejector plate, and one end of the ejector pin facing away from the ejector pin plate is movably mounted on the movable platen, inserted into the mounting cavity, and then fixed to the movable platen.

[0008] Furthermore, the ejector pin is in an inverted T-shape and has a T-shaped portion, and the T-shaped portion is assembled on the ejector pin plate.

[0009] Furthermore, the shape of the contoured top block matches the shape of the injection molded part.

[0010] Furthermore, the height of the installation cavity is greater than the thickness of the movable top plate.

[0011] Furthermore, a glue position insert is provided in the movable mold core, and the glue position insert has a clearance hole that cooperates with the profiling ejector block, and the profiling ejector block can be slidably inserted into the clearance hole.

[0012] Furthermore, the movable mold plate is provided with a mounting groove opening toward the bottom of the movable mold core, the movable top plate can be movably assembled in the mounting groove, a guide rod is provided in the movable mold core, and the movable top plate is provided with a guide groove matching the guide rod, and the guide rod can be slidably inserted into the guide groove toward one end of the mounting groove; the mounting groove and the movable mold core cooperate to form the mounting cavity.

[0013] Furthermore, it also includes a driving assembly for resetting the movable top plate; the driving assembly includes a reset rod, and the reset rod has an elastically retractable telescopic end; the fixed end of the reset rod is fixed to the movable mold core; the telescopic end of the reset rod is inserted into the installation cavity and abuts against the movable top plate.

[0014] The utility model provides an injection mold, which at least comprises the ejection mechanism of the injection mold.

[0015] The technical solution provided by the utility model has the following beneficial effects:

[0016] The profiling ejector block is slidably assembled on the movable mold core of the movable platen, and the end of the profiling ejector block facing away from the movable mold core is inserted into the installation cavity and then fixed to the movable ejector plate. The movable ejector plate is then driven to rise and fall in the installation cavity by the ejector pin, thereby driving the profiling ejector block to rise and fall in the movable mold core, thereby ensuring that the injection molded part is ejected by the profiling ejector block. In this way, the ejection mechanism containing flat ejectors in the prior art can be replaced to realize the normal ejection of the injection molded part from the injection mold.

[0017] In addition, the movable top plate cooperates with the contoured top block to eject, so as to effectively reduce the length of the contoured top block itself, thereby avoiding the abnormal ejection height caused by the deformation of the contoured top block due to excessive length, and can also increase the bottom support of the contoured top block. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is an appearance diagram of the ejection mechanism of the injection mold in Example 1;

[0019] Figure 2 The figure shows a cross-sectional view of the ejection mechanism of the injection mold in the first embodiment at the first position;

[0020] Figure 3 Shown Figure 2 Enlarged schematic diagram of area A in the middle;

[0021] Figure 4 It is a cross-sectional view of the ejection mechanism of the injection mold in the second position in the first embodiment;

[0022] Figure 5 Shown is a schematic diagram of the contoured top block in Example 1;

[0023] Figure 6 Shown is a schematic diagram of the movable top plate in Example 1;

[0024] Figure 7 Shown is a schematic diagram of the ejector pin in Example 1;

[0025] Figure 8 Shown is a schematic diagram of the injection molded part in Example 1. DETAILED DESCRIPTION

[0026] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0027] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0028] Example 1

[0029] Reference Figures 1 to 4 As shown, this embodiment provides an ejection mechanism of an injection mold (hereinafter referred to as the ejection mechanism) for ejecting small-sized and irregular-shaped objects such as Figure 8 The molded part 9 is shown ejected from the injection mold.

[0030] The ejection mechanism of this embodiment includes a movable template 1, a movable ejector plate 2, an ejector pin 4, an ejector plate 5 cooperating with the ejector pin 4, and a contour ejector block 3 for ejecting the injection molded part 9. The movable template 1 has a mounting cavity 12 for accommodating the movable ejector plate 2. The movable ejector plate 2 can be lifted and lowered in the mounting cavity 12. The contour ejector block 3 can be slidably mounted on the movable mold core 11 of the movable template 1, and the lower end of the contour ejector block 3 facing away from the movable mold core 11 is passed through the mounting cavity 12 and fixed to the movable ejector plate 2. The contour ejector block 3 and the ejector pin 4 are respectively located on the upper and lower sides of the movable ejector plate 2, and the upper end of the ejector pin 4 facing away from the ejector plate 5 can be movably mounted on the movable template 1 and passed through the mounting cavity 12, and then fixed to the movable ejector plate 2. In addition, the ejector plate 5 is mounted on the lower fixed plate 10 of the injection mold. Of course, as Figure 6 The movable top plate 2 shown can also be composed of a first movable top plate 21 and a second movable top plate 22 arranged upper and lower, and the contoured top block 3 is fixedly assembled on the first movable top plate 21, and the ejector pin 4 is fixedly assembled on the second movable top plate 22 to facilitate assembly.

[0031] In this embodiment, Figure 5 The contour of the contoured ejector block 3 shown matches the contour of the molded part 9, enabling direct contouring to produce the contoured ejector block 3. This makes the workpiece dimensional accuracy of the contoured ejector block 3 easier to control, resulting in a more uniform ejection arrangement and better balanced ejection force. Of course, the number of contoured ejector blocks 3 provided depends on the size and structure of the injection molding jig and the molded part 9.

[0032] like Figure 2 and Figure 3 As shown, the height of the mounting cavity 12 is greater than the thickness of the movable top plate 2 itself, so as to ensure that the movable top plate 2 has enough space for upward and downward movement in the mounting cavity 12, thereby controlling the ejection height of the contoured top block 3.

[0033] More specifically, the movable platen 1 is provided with a mounting groove opening toward the bottom of the movable mold core 11 , and the movable top plate 2 is movably assembled in the mounting groove. The mounting groove and the movable mold core 11 cooperate to form a mounting cavity 12 .

[0034] like Figure 4 The movable mold core 11 is provided with a guide rod 7, as shown in FIG. Figure 6 The movable top plate 2 shown is provided with a guide groove 23 that cooperates with the guide rod 7. The guide rod 7 is slidably inserted into the guide groove 23 at one end facing the installation groove. Through the guiding effect of the guide rod 7, it is further ensured that the upward and downward movement directions of the contoured top block 3 in the installation cavity 12 are relatively stable, thereby further ensuring the accuracy of the ejection height of the contoured top block 3.

[0035] A glue position insert 6 is provided in the movable mold core 11. The glue position insert 6 has a clearance hole that cooperates with the profiling ejector block 3. The profiling ejector block 3 is slidably inserted into the clearance hole.

[0036] When the mold is opened, the ejector plate 5 drives the ejector 4 to rise, the ejector 4 drives the movable ejector plate 2 to move upward, the movable ejector plate 2 pushes up the contour ejector block 3, and finally the contour ejector block 3 ejects the injection molded part 9 to complete the ejection action of the injection molded part 9.

[0037] The profiling ejector block 3 is slidably assembled on the movable mold core 11 of the movable mold plate 1, and the end of the profiling ejector block 3 facing away from the movable mold core 11 is inserted into the installation cavity 12, and then fixed to the movable top plate 2. The movable top plate 2 is then driven to rise and fall in the installation cavity 12 by the ejector pin 4, thereby driving the profiling ejector block 3 to rise and fall in the movable mold core 11, thereby ensuring that the injection molded part 9 is ejected by the profiling ejector block 3. In this way, the ejection mechanism containing flat ejectors in the prior art can be replaced to realize the normal ejection of the injection molded part 9 from the injection mold.

[0038] In addition, the movable top plate 2 cooperates with the contoured top block 3 to be ejected, so as to effectively reduce the length of the contoured top block 3 itself, thereby avoiding the abnormal ejection height caused by the deformation of the contoured top block 3 due to its own excessive length, and can also increase the bottom support of the contoured top block 3.

[0039] In another preferred embodiment, the ejection mechanism of this embodiment further includes a driving component for resetting the movable top plate 2. The specific driving component includes: Figure 3 The reset rod 8 shown has an elastically retractable telescopic end. The fixed end of the reset rod 8 is fixed to the movable mold core 11 . The telescopic end of the reset rod 8 is passed through the installation cavity 12 and abuts against the movable top plate 2 .

[0040] When the injection molded part 9 is injection molded in the injection mold, the reset rod 8 can ensure that the contoured top block 3 does not rock up and down during the injection molding of the injection molded part 9.

[0041] When the mold is opened, the ejector plate 5 is pushed upward, and it is necessary to overcome the downward elastic force restriction of the reset rod 8 to eject the ejector 4, the movable ejector plate 2 and the contoured ejector block 3 upward synchronously.

[0042] When the ejector plate 5 moves downward to its original position, the ejector pin 4 is no longer driven upward by the ejector plate 5. At this time, the reset rod 8 relies on its own downward elastic force to push the movable ejector plate 2 together with the ejector pin 4 and the contour ejector block 3 downward, thereby pushing the contour ejector block 3 back to its original position so that the next injection molded part 9 can continue to be injected.

[0043] More preferably, Figure 7 As shown, the ejector pin 4 is in an inverted T-shape and has a T-shaped portion 41 at the lower end. The T-shaped portion 41 is assembled on the ejector plate 5, which makes installation easier. In addition, the ejector pin 4 is not restricted by the contoured ejector block 3, and an ejector pin 4 with a larger diameter can be used to avoid jamming and breakage of the ejector pin 4 during ejection, thereby effectively improving the service life of the ejector pin 4.

[0044] Example 2

[0045] The second embodiment provides an injection mold, which at least includes the ejection mechanism of the injection mold of the first embodiment.

[0046] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. An ejection mechanism for an injection mold, comprising a movable platen, characterized in that: It also includes a movable ejector plate, an ejector pin, an ejector plate cooperating with the ejector pin, and a contoured ejector block for ejecting the injection molded part; The movable platen has an installation cavity for accommodating the movable top plate, and the movable top plate is assembled in the installation cavity in a liftable manner; The profiling top block is slidably assembled on the movable die core of the movable platen, and one end of the profiling top block facing away from the movable die core is passed through the installation cavity and fixed to the movable top plate; The contoured ejector block and the ejector pin are respectively located on the upper and lower sides of the movable ejector plate, and the end of the ejector pin away from the ejector pin plate is movably assembled on the movable template, passed through the installation cavity, and then fixed to the movable ejector plate.

2. The ejection mechanism of the injection mold according to claim 1, characterized in that: The ejector pin is in an inverted T-shape and has a T-shaped portion, and the T-shaped portion is assembled on the ejector pin plate.

3. The ejection mechanism of the injection mold according to claim 1, characterized in that: The contoured top block has an outer shape that matches the outer shape of the injection molded part.

4. The ejection mechanism of the injection mold according to any one of claims 1 to 3, characterized in that: The height of the cavity in the installation cavity is greater than the thickness of the movable top plate itself.

5. The ejection mechanism of the injection mold according to any one of claims 1 to 3, characterized in that: A glue position insert is provided in the movable mold core. The glue position insert has a clearance hole that cooperates with the profiling ejector block. The profiling ejector block is slidably arranged in the clearance hole.

6. The ejection mechanism of the injection mold according to any one of claims 1 to 3, characterized in that: The movable mold plate is provided with a mounting groove opening toward the bottom of the movable mold core, the movable top plate can be movably assembled in the mounting groove, a guide rod is provided in the movable mold core, and the movable top plate is provided with a guide groove matching the guide rod, and the guide rod is slidably inserted into the guide groove at one end facing the mounting groove; the mounting groove and the movable mold core cooperate to form the mounting cavity.

7. The ejection mechanism of the injection mold according to any one of claims 1 to 3, characterized in that: It also includes a drive assembly for resetting the movable top plate; the drive assembly includes a reset rod, the reset rod has an elastically retractable telescopic end; the fixed end of the reset rod is fixed to the movable mold core; the telescopic end of the reset rod is inserted into the installation cavity and abuts against the movable top plate.

8. An injection mold, characterized in that: The invention comprises at least the ejection mechanism of the injection mold according to any one of claims 1 to 7.

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