Ejection mechanism and mold

Abstract

The utility model relates to the technical field of injection molds, in particular to an ejection mechanism and a mold. The ejection mechanism provided by the utility model comprises a rear mold core, a sliding seat, a sliding block and an ejector pin, the sliding seat is arranged on one side of the rear mold core and can slide in the direction perpendicular to the mold opening and closing direction; the sliding block comprises a connecting part and a forming part, the connecting part is connected with the sliding seat, the forming part is used for forming part of a cavity, the cavity is defined by the rear mold core, the forming part and the front mold core, a sliding groove is formed in the rear mold core, and the sliding block is in sliding fit with the sliding groove, so that after the sliding block slides laterally, an avoiding gap is formed in the sliding groove; the ejector pin is located below the sliding block and right faces the cavity, the ejector pin is used for forming an avoiding gap in the sliding groove and then moving upwards so as to eject a product formed in the cavity, the end face of the ejector pin does not make contact with the surface of the product, namely, the ejector pin does not participate in product forming, and therefore ejector pin marks can be avoided, and the appearance of the product is effectively improved.

Description

Technical Field

[0001] This patent relates to the field of injection mold technology, and in particular to an ejection mechanism and a mold. Background Art

[0002] An injection mold is a tool for producing plastic products; it is also a tool that gives plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and obtaining a molded product after cooling and solidification.

[0003] When products with limited space on the injection molding machine are demoulded, ejector marks will appear on the product through conventional injection molds. Summary of the invention

[0004] This patent provides an ejection mechanism and a mold to at least solve the above technical problems existing in the prior art.

[0005] The first aspect of the present patent provides an ejection mechanism, comprising: a rear mold core, a sliding seat, a slider and an ejector pin;

[0006] The sliding seat is arranged on one side of the rear mold core and can slide in a direction perpendicular to the mold opening and closing direction;

[0007] The slider includes a connecting portion and a forming portion, the connecting portion is connected to the sliding seat, the forming portion is used to form a part of the cavity, the rear mold core, the forming portion and the front mold core enclose the cavity, the rear mold core is provided with a slide groove, the slider is slidably matched with the slide groove, so that after the slider slides sideways, an avoidance gap is formed in the slide groove;

[0008] The ejector pin is located below the slider and directly faces the cavity. The ejector pin is used to form an escape gap in the slide groove and then move upward to eject the product formed in the cavity.

[0009] Furthermore, the molding portion includes a side wall and a bottom wall, the top of the side wall is used to abut against the front mold core, and the bottom wall is used to form a molding gap with the front mold core.

[0010] Furthermore, the rear mold core is provided with a through hole, the through hole extends along the mold opening and closing direction, and the ejector pin is slidably fitted in the through hole.

[0011] Furthermore, there are a plurality of ejector pins, and the plurality of ejector pins are arranged around the cavity at the bottom of the molding portion.

[0012] Furthermore, the width of the slide groove gradually increases in a direction away from the center of the rear mold core.

[0013] Furthermore, the height of the slide groove gradually increases in a direction away from the center of the rear mold core.

[0014] Furthermore, the rear mold core is square, and the sliding seat and the sliding block connected to the sliding seat are arranged on all four sides of the rear mold core.

[0015] Furthermore, the sliding seat is provided with a mounting hole for mounting the oblique guide column.

[0016] Furthermore, the rear mold core is connected with a boss, the boss extends in a direction away from the rear mold core, the sliding seat is provided with a guide groove, and the boss is slidably matched with the guide groove.

[0017] A second aspect of the present disclosure provides a mold, comprising the ejection mechanism described in the first aspect.

[0018] The technical solution provided by this patent embodiment has the following advantages compared with the prior art:

[0019] The ejection mechanism provided by the embodiment of the present patent includes a rear mold core, a sliding seat, a slider and an ejector pin; the sliding seat is arranged on one side of the rear mold core and can slide in a direction perpendicular to the mold opening and closing direction; the slider includes a connecting portion and a forming portion, and the connecting portion is connected to the sliding seat; the forming portion is used to form a part of the cavity, that is, a part of the slider participates in the forming. The rear mold core, the forming portion and the front mold core enclose the cavity, and the ejector pin does not participate in the forming. The rear mold core is provided with a slide groove, and the slider and the slide groove slide in cooperation, so that after the slider slides sideways, an escape gap is formed in the slide groove, and the escape gap is used for the ejector pin to contact the product after moving upward to eject the product, so that the product is out of the cavity. Among them, the ejector pin is located below the slider and directly opposite to the cavity. The ejector pin is used to form an escape gap in the slide groove and then move upward to eject the product formed in the cavity. The end face of the ejector pin does not contact the product surface, that is, it does not participate in the product forming, so the ejector pin mark can be avoided, and the appearance of the product can be effectively improved.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of this patent, nor is it intended to limit the scope of this patent. Other features of this patent will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0022] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0023] Figure 1The structure diagram of the ejection mechanism provided by the embodiment of the present invention is shown. Figure 1 ;

[0024] Figure 2 for Figure 1 A partial enlarged view of point a in the middle;

[0025] Figure 3 The structure diagram of the ejection mechanism provided by the embodiment of the present invention is shown. Figure 2 ;

[0026] Figure 4 A schematic diagram of the top view of the ejection mechanism provided in the embodiment of the present invention is shown;

[0027] Figure 5 for Figure 4 Middle AA section view;

[0028] Figure 6 A schematic diagram of the structure of the ejection mechanism provided by an embodiment of the present patent after the slider is removed is shown.

[0029] Explanation of the numbers in the figure: 1, rear mold core; 11, slide groove; 111, avoidance gap; 12, boss; 2, sliding seat; 21, mounting hole; 22, guide groove; 3, slider; 31, connecting part; 32, molding part; 321, side wall; 322, bottom wall; 4, ejector pin; 5, cavity. DETAILED DESCRIPTION

[0030] In order to make the purpose, features, and advantages of this patent more obvious and easy to understand, the technical solutions in the embodiments of this patent will be clearly and completely described below in conjunction with the drawings in the embodiments of this patent. Obviously, the described embodiments are only part of the embodiments of this patent, not all of them. Based on the embodiments in this patent, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this patent.

[0031] Combination Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the ejection mechanism provided by the embodiment of the present patent includes a rear mold core 1, a sliding seat 2, a slider 3 and an ejector pin 4; the sliding seat 2 is arranged on one side of the rear mold core 1 and can slide in a direction perpendicular to the opening and closing direction of the mold; the slider 3 includes a connecting portion 31 and a molding portion 32, and the connecting portion 31 is connected to the sliding seat 2; optionally, the connecting portion 31 and the sliding seat 2 can be directly connected, or can be connected by fasteners or other connecting parts. The molding portion 32 is used to form a part of the cavity 5, that is, a part of the slider 3 participates in the molding. The rear mold core 1, the molding portion 32 and the front mold core enclose the cavity 5, and the ejector pin 4 does not participate in the molding. The rear mold core 1 is provided with a slide groove 11, and the slider 3 is slidably matched with the slide groove 11, so that after the slider 3 slides sideways, an avoidance gap 111 is formed in the slide groove 11, and the avoidance gap 111 is used for the ejector pin 4 to contact the product after moving upward to eject the product, so that the product is separated from the cavity 5. Among them, the ejector pin 4 is located below the slider 3 and directly opposite to the cavity 5. The ejector pin 4 is used to form an avoidance gap 111 in the slide 11 and then move upward to eject the product formed in the cavity 5. The end face of the ejector pin 4 does not contact the product surface, that is, it does not participate in the product molding, so the ejector mark can be avoided and the appearance of the product can be effectively improved. In other words, the molding part 32 of the slider 3 replaces the original ejection position, and the ejection does not contact the product during the cooling and solidification process of the product plastic injection molding. The ejector pin 4 is hidden under the slider 3. When the product is cooled to a temperature that can be ejected and demolded, the mold opening slider 3 retreats, and the ejector pin 4 rises from the bottom of the slider 3. After a period of empty ejection, it finally reaches the glue surface and completes the demolding and ejection. Since there is no contact during the cooling process of the product plastic injection, the problem of ejection burrs and excess glue can be solved.

[0032] like Figure 2 As shown, the molding part 32 includes a side wall 321 and a bottom wall 322. The top of the side wall 321 is used to abut against the front mold core, and the bottom wall 322 is used to form a molding gap with the front mold core. The bottom wall 322 and the side wall 321 of the molding part 32 replace the ejector pin 4 to form part of the cavity 5 and participate in the molding, which can avoid the ejector mark and effectively improve the appearance of the product.

[0033] In some specific embodiments, the rear mold core 1 is provided with a through hole, which extends along the direction of mold opening and closing, and the ejector pin 4 slides in the through hole. The through hole is located below the slider 3 and is separated from the cavity 5 structure, which can reduce the processing accuracy requirements of the through hole and improve the processing efficiency. In some embodiments, there are multiple ejector pins 4, and multiple ejector pins 4 are arranged at the bottom of the molding portion 32 around the cavity 5. Multiple ejector pins 4 are all arranged below the slider 3 and are directly opposite to the cavity 5. When the ejection mechanism opens the mold, the four sliding seats 2 arranged on the side of the rear mold core 1 all slide outward synchronously, driving the slider 3 to slide outward, providing a clearance gap 111 for multiple ejector pins 4, and then multiple ejector pins 4 move upward to eject the product formed in the cavity 5. In the embodiment of the present patent, the molding portion 32 of the slider 3 is used to replace the original ejection position. During the cooling and solidification process of the product plastic injection molding, the ejector does not contact the product. The ejector pin 4 is hidden under the slider 3. When the product is cooled to a temperature that can be ejected and demolded, the mold opening slider 3 retreats, and the ejector pin 4 rises from the bottom of the slider 3. After a certain distance of empty ejection, it finally reaches the glue surface to complete the demolding and ejection. Since there is no contact during the cooling process of the product plastic injection, the problem of ejection burrs and excess glue can be solved.

[0034] When the ejection mechanism opens the mold, the sliding seat 2 arranged on the side of the rear mold core 1 needs to slide outward synchronously. In the direction away from the center of the rear mold core 1, the width of the slide groove 11 gradually increases, which is convenient for the slider 3 to slide out, which can improve the work efficiency during demoulding and achieve rapid and reliable demoulding of the product. In the direction away from the center of the rear mold core 1, the height of the slide groove 11 gradually increases, which is convenient for the slider 3 to slide out, which can improve the work efficiency during demoulding and achieve rapid and reliable demoulding of the product.

[0035] In some specific embodiments, the rear mold core 1 is square, and the rear mold core 1 is provided with sliding seats 2 and sliders 3 connected to the sliding seats 2 on all sides. When the ejection mechanism opens the mold, the four sliding seats 2 arranged on the sides of the rear mold core 1 all slide outward synchronously, driving the sliders 3 to slide outward, providing a clearance gap 111 for the multiple ejector pins 4, and then the multiple ejector pins 4 move upward to eject the product formed in the cavity 5. The rear mold core 1 is provided with sliding seats 2 and sliders 3 connected to the sliding seats 2 on all sides, which can improve the work efficiency during demolding and realize fast and reliable demolding of the product.

[0036] In some specific embodiments, the sliding seat 2 is provided with a mounting hole 21 for mounting an inclined guide column. Optionally, two mounting holes 21 are provided on each slider 3, and the mounting holes 21 are arranged obliquely. Two matching inclined guide columns are fixed on the front mold core of the injection mold, and the inclined guide columns are inserted into the mounting holes 21 for cooperation. When the mold is opened, the guide column moves upward under the drive of the front mold core, and the guide column slides and cooperates with the mounting hole 21, driving the sliding seat 2 to slide sideways, so that the slider 3 slides outward, and an avoidance gap 111 is formed in the slide groove 11 for the ejector pin 4 to pass through.

[0037] In some specific embodiments, the rear mold core 1 is connected to a boss 12, which extends in a direction away from the rear mold core 1. The sliding seat 2 is provided with a guide groove 22. The boss 12 and the guide groove 22 are slidably matched to improve the sliding stability of the sliding seat 2.

[0038] The mold provided in the embodiment of the present invention includes the ejection mechanism provided in the embodiment of the present invention. Since the mold provided in the embodiment of the present invention has the same advantages as the ejection mechanism provided in the embodiment of the present invention, they will not be described in detail here.

[0039] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this patent can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this patent can be achieved, and this document does not limit it here.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this patent, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] The above are only specific implementations of this patent, but the protection scope of this patent is not limited to this. Any technician familiar with this technical field can easily think of changes or substitutions within the technical scope disclosed by this patent, which should be covered by the protection scope of this patent. Therefore, the protection scope of this patent should be based on the protection scope of the claims.

Claims

1. An ejection mechanism, characterized in that: include: A rear mold core (1), a sliding seat (2), a slider (3) and an ejector pin (4); The sliding seat (2) is arranged on one side of the rear mold core (1) and can slide in a direction perpendicular to the mold opening and closing direction; The slider (3) comprises a connecting portion (31) and a forming portion (32), wherein the connecting portion (31) is connected to the sliding seat (2), and the forming portion (32) is used to form a portion of the cavity (5). The rear mold core (1), the forming portion (32) and the front mold core enclose the cavity (5), and the rear mold core (1) is provided with a slide groove (11). The slider (3) is slidably matched with the slide groove (11), so that after the slider (3) slides sideways, an avoidance gap (111) is formed in the slide groove (11); The ejector pin (4) is located below the slider (3) and directly opposite to the cavity (5); the ejector pin (4) is used to form an escape gap (111) in the slide groove (11) and then move upward to eject the product formed in the cavity (5).

2. The ejection mechanism according to claim 1, characterized in that: The molding portion (32) comprises a side wall (321) and a bottom wall (322); the top of the side wall (321) is used to abut against the front mold core, and the bottom wall (322) is used to form a molding gap with the front mold core.

3. The ejection mechanism according to claim 1, characterized in that: The rear mold core (1) is provided with a through hole, the through hole extends along the mold opening and closing direction, and the ejector pin (4) is slidably fitted in the through hole.

4. The ejection mechanism according to claim 1, characterized in that: There are a plurality of ejector pins (4), and the plurality of ejector pins (4) are arranged around the mold cavity (5) at the bottom of the molding portion (32).

5. The ejection mechanism according to claim 1, characterized in that: The width of the slide groove (11) gradually increases in a direction away from the center of the rear mold core (1).

6. The ejection mechanism according to claim 1, characterized in that: Along the direction away from the center of the rear mold core (1), the height of the slide groove (11) gradually increases.

7. The ejection mechanism according to claim 1, characterized in that: The rear mold core (1) is square in shape, and the sliding seat (2) and a sliding block (3) connected to the sliding seat (2) are arranged on all four sides of the rear mold core (1).

8. The ejection mechanism according to claim 1, characterized in that: The sliding seat (2) is provided with a mounting hole (21) for mounting the oblique guide column.

9. The ejection mechanism according to claim 1, characterized in that: The rear mold core (1) is connected to a boss (12), the boss (12) extends in a direction away from the rear mold core (1), the sliding seat (2) is provided with a guide groove (22), and the boss (12) is slidably matched with the guide groove (22).

10. A mold, characterized in that: The invention comprises the ejection mechanism according to any one of claims 1 to 9.

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