Secondary ejection structure of injection mold

Abstract

The utility model discloses a secondary ejection structure of an injection mold, which comprises a mold frame, a primary ejection plate group and a secondary ejection plate group are vertically stacked in the mold frame, a plurality of ejector pins I are arranged on the primary ejection plate group, a plurality of ejector pins II are arranged on the secondary ejection plate group, and the ejector pins I and the ejector pins II penetrate into a mold core. The ejection assembly penetrates through the primary ejection plate set and abuts against the bottom face of the secondary ejection plate set. First inserts are fixedly arranged on the two sides of the mold frame respectively, second inserts corresponding to the first inserts are fixedly arranged on the two sides of the primary ejection plate set, first steps are arranged on the side faces of the second inserts, third inserts are connected to the first steps in a clamped mode and horizontally arranged on the side face of the secondary ejection plate set, and elastic pieces are arranged between the third inserts and the secondary ejection plate set. Secondary ejection and separation are achieved through mutual cooperation of the first insert, the second insert, the third insert and the elastic piece, the number of parts is small, the action process is small, the structure is simple, structural modification on the mold is small, and the influence on the structural stability of the mold is reduced to the minimum.

Description

Technical Field

[0001] The utility model belongs to the technical field of ejection structures of injection molds, in particular to a secondary ejection structure of an injection mold. Background Art

[0002] Injection mold is a commonly used mold in industrial production, used to form complex plastic parts. Different products have different ejection and demoulding methods. At present, the most common method is to adopt segmented ejection, and a segmented ejection mechanism is set in the mold accordingly. Different manufacturers also have different ejection structures. For example, the public patent documents "CN103963244A, swing block secondary ejection injection mold", "CN103963224A, push ball secondary ejection injection mold" and "CN112477022B, an injection mold crank slider secondary ejection structure" and so on. Although these structures can realize the secondary ejection method, they have complex structures, many parts, and many movements of each part, which is not only inconvenient to maintain, but also affects the stability of the mold structure. Utility Model Content

[0003] The utility model aims to provide a secondary ejection structure of an injection mold to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A secondary ejection structure of an injection mold, comprising a mold frame, wherein a primary ejection plate group and a secondary ejection plate group are stacked up and down in the mold frame, a plurality of ejector pins 1 are arranged on the primary ejection plate group, and a plurality of ejector pins 2 are arranged on the secondary ejection plate group, wherein the ejector pins 1 and 2 are both inserted into the mold core, and the ejection assembly passes through the primary ejection plate group and abuts against the bottom surface of the secondary ejection plate group;

[0006] Insert one is fixed on both sides of the mold frame, insert two corresponding to insert one is fixed on both sides of the primary ejection plate group, step one is provided on the side of insert two, insert three is clamped on the step one, insert three is horizontally placed on the side of the secondary ejection plate group, and an elastic part is provided between insert three and the secondary ejection plate group, a slope one is provided on the side of insert one close to insert three, a slope two matching with slope one is provided on one side of insert three, and slope one is located above step one.

[0007] A further technical solution is that one end of the insert one is fixedly mounted on the upper end of the mold frame, a bar hole with one end open is provided at the position corresponding to the insert two, the insert two is placed in the bar hole, a step two corresponding to the step one is provided in the middle of the insert three, and the inclined surface two is provided on both sides of the step two.

[0008] A further technical solution is that the mold frame includes upper and lower corresponding pads and a bottom plate, a plurality of guide columns are arranged between the pads and the bottom plate, the guide columns respectively pass through the primary ejector plate group and the secondary ejector plate group, the primary ejector plate group includes an ejector plate 1 and an ejector plate 2 arranged upper and lower, the ejector plate 1 is provided with a step 3, and the bottom of the guide column is provided with a step 4 cooperating with the step 3.

[0009] According to a further technical solution, both sides of the ejector plate 1 and the ejector plate 2 are fixedly connected to the insert 2 respectively.

[0010] According to a further technical solution, a plurality of positioning posts are provided on the upper surface of the secondary ejector plate assembly, the positioning posts can be inserted into the pad, and a spring 1 is sleeved on the positioning posts, and two ends of the spring 1 are respectively against the secondary ejector plate assembly and the pad.

[0011] According to a further technical solution, a second spring is provided between the second ejection plate and the bottom plate, and the second spring is sleeved on the guide column.

[0012] According to a further technical solution, the outer side surfaces of the insert 1, the insert 2 and the mold frame are flush.

[0013] Beneficial effects of the utility model:

[0014] The utility model realizes secondary ejection and separation through the mutual cooperation of insert one, insert two, insert three and elastic member, has fewer parts, fewer action processes, simple structure, less structural modification to the mold, and reduces the influence on the stability of the mold structure to a minimum. Moreover, the above structures are all arranged on the outside of the mold, and there is no need to disassemble the mold frame during maintenance, which makes maintenance more convenient.

[0015] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : A three-dimensional structural diagram of the utility model.

[0017] Figure 2 : A cross-sectional structural diagram of the utility model.

[0018] Figure 3 : Schematic diagram of the action of the utility model.

[0019] Figure 4 : Distribution diagram of insert one, insert two, insert three and elastic member of the utility model.

[0020] Figure numerals: 11-mold frame, 111-pad, 112-bottom plate, 113-guide column, 114-step three, 12-mold core, 2-primary ejector plate group, 21-ejector plate one, 22-ejector plate two, 23-ejector pin one, 24-step four, 31-secondary ejector plate group, 32-ejector pin two, 33-positioning column, 34-spring one, 411-insert one, 412-hole, 413-inclined surface one, 421-insert two, 422-step one, 431-insert three, 432-step two, 433-inclined surface two, 44-elastic member, 5-ejector assembly. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] Please refer to Figure 1-4 ;

[0023] The secondary ejection structure of the utility model aims to simplify the overall structure and make maintenance more convenient, and specifically comprises a mold frame 11, wherein a primary ejection plate group 2 and a secondary ejection plate group 31 are stacked up and down in the mold frame 11. In the present embodiment, the primary ejection plate group 2 and the secondary ejection plate group 31 can be a single plate or a plurality of plates stacked together, which is not limited here. The primary ejection plate group 2 is provided with a plurality of ejector pins 23, and the secondary ejection plate group 31 is provided with a plurality of ejector pins 22. Both the ejector pins 23 and the ejector pins 22 are inserted into the mold core 12. In the present embodiment, the primary ejection plate group 2 and the secondary ejection plate group 31 can be the same size, or the area of ​​the primary ejection plate group 2 can be larger than that of the secondary ejection plate group 31. In the former, the plurality of ejector pins 23 arranged on the primary ejection plate group 2 pass through the secondary ejection plate group 31 and extend into the mold core 12, while in the latter, the plurality of ejector pins 23 do not pass through the secondary ejection plate group 31 and directly extend into the mold core 12. No matter which method is adopted, the same effect can be achieved.

[0024] Further, inserts 1 411 are fixedly provided on both sides of the mold frame 11, inserts 2 421 corresponding to inserts 1 411 are fixedly provided on both sides of the primary ejection plate group 2, a step 1 422 is provided on the side of the insert 2 421, inserts 3 431 are clamped on the step 1 422, inserts 3 431 are horizontally placed on the side of the secondary ejection plate group 31, and an elastic member 44 is provided between the inserts 3 431 and the secondary ejection plate group 31, in the initial state, the step 1 422 abuts against the upper end surface of the inserts 3 431 to form a clamping state, an inclined surface 1 413 is provided on the side of the insert 1 411 close to the inserts 3 431, the inclined surface 1 413 corresponds to the step up and down, an inclined surface 2 433 matching the inclined surface 1 413 is provided on one side of the insert 3 431, and the inclined surface 1 413 is located above the step 1 422;

[0025] During operation, the ejector assembly 5 moves, wherein the ejector assembly 5 passes through the primary ejector plate assembly 2 and abuts against the bottom surface of the secondary ejector plate assembly 31; the ejector assembly 5 pushes the secondary ejector plate assembly 31 upward, so that the insert 3 431 and the insert 2 421 are in a clamping state, so when the secondary ejector plate assembly 31 moves upward, it will pull the insert 2 421 to move upward relative to the insert 1 411, that is, the primary ejector plate assembly 2 moves upward synchronously, and the ejector pin 1 23 and the ejector pin 2 32 At the same time, the product is contacted and ejected from the acupuncture point in the mold core 12. As the secondary ejection plate assembly 31 moves upward to a certain extent, the second inclined surface 433 of the insert 3 431 contacts the inclined surface 1 413 of the insert 1 411, and shrinks into the secondary ejection plate assembly 31 and decouples from the insert 2 421 as it rises. At this time, the primary ejection plate assembly 2 loses support and moves downward, while the secondary ejection plate assembly 31 continues to move upward under the push of the ejection assembly 5 to perform secondary ejection.

[0026] Further explanation, the ejector pin 23 in this embodiment is relatively large in size, and its end surface is provided with a shape of a partially formed product, so the function of the secondary ejection is to separate the product from the ejector pin 23, and during the secondary ejection process, the primary ejector plate group 2 and the secondary ejector plate group 31 move in opposite directions, that is, the ejector pin 2 32 moves upward, and the ejector pin 23 moves downward, so that the product and the ejector pin 23 can be separated more quickly.

[0027] After the secondary ejection is completed, the ejection assembly 5 drives the secondary ejection plate group 31 to move downward, or the secondary ejection plate group 31 moves downward under the action of gravity. During this process, the insert three 431 always remains retracted in the secondary ejection plate group 31. When the secondary ejection plate group 31 descends to a certain position, the insert three 431 is located below the step one 422. At this time, under the action of the elastic member 44, the insert three 431 is pushed out to the insert two 421 and contacts with the step one 422 up and down to be re-engaged.

[0028] The utility model realizes secondary ejection and separation through the mutual cooperation of the insert 1 411, the insert 2 421, the insert 3 431 and the elastic member 44, has fewer parts, fewer action processes, a simple structure, and less structural modification to the mold, which reduces the impact on the stability of the mold structure to a minimum. Moreover, the above structures are all arranged on the outside of the mold, and there is no need to disassemble the mold frame 11 during maintenance, making maintenance more convenient.

[0029] The utility model further explains about insert one 411, insert two 421 and insert three 431, wherein one end of insert one 411 is fixedly arranged on the upper end part of the mold frame 11, and a strip hole 412 with one end open is arranged at the position corresponding to the position of insert two 421, and insert two 421 is placed in the strip hole 412. Preferably, the outer side surfaces of insert one 411, insert two 421 and mold frame 11 are flush, and correspondingly, grooves for accommodating insert one 411 and insert two 421 are arranged on the side surfaces of the primary ejection plate group 2 and the secondary ejection plate group 31, so that insert one 411 and insert two 421 do not protrude from the mold, thereby reducing the volume occupied; based on the structure of this embodiment, a step two 432 corresponding to step one 422 is arranged in the middle part of insert three 431, and a slope two 433 is arranged on both sides of step two 432.

[0030] One embodiment of the mold frame 11 of the utility model specifically includes a pad plate 111 and a bottom plate 112 corresponding to each other in the upper and lower parts. A plurality of guide columns 113 are arranged between the pad plate 111 and the bottom plate 112. The guide columns 113 pass through the primary ejector plate group 2 and the secondary ejector plate group 31 respectively. The primary ejector plate group 2 includes an ejector plate 1 21 and an ejector plate 22 arranged in the upper and lower parts. A step 3 114 is arranged at the ejector plate 1 21. In short, the ejector plate 1 21 and the ejector plate 22 are respectively provided with holes for the guide columns 113 to pass through, and the aperture of the ejector plate 1 21 is smaller than the aperture of the ejector plate 22 to form a step. A step 4 24 cooperating with the step 3 114 is arranged at the bottom of the guide column 113. In the initial state or when resetting, the step 3 114 and the step 4 24 collide with each other to prevent the ejector plate 22 from colliding with the bottom plate 112.

[0031] Preferably, both sides of the ejection plate 1 21 and the ejection plate 2 22 are fixedly connected to the insert 2 421 respectively.

[0032] Furthermore, a plurality of positioning posts 33 are provided on the upper surface of the secondary ejector plate group 31. The positioning posts 33 can be inserted into the pad 111, and a spring 34 is sleeved on the positioning posts 33. The two ends of the spring 34 are respectively against the secondary ejector plate group 31 and the pad 111. The spring 34 provides a buffer for the secondary ejector plate group 31 during its rising process to avoid collision with the pad 111.

[0033] In addition, a second spring (not shown) is provided between the second ejector plate 22 and the bottom plate 112 . The second spring is sleeved on the guide column 113 . The second spring provides a buffer for the descent of the primary ejector plate group 2 to reduce vibration.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A secondary ejection structure of an injection mold, comprising a mold frame (11), wherein a primary ejection plate group (2) and a secondary ejection plate group (31) are stacked up and down in the mold frame (11), the primary ejection plate group (2) is provided with a plurality of ejector pins (23), the secondary ejection plate group (31) is provided with a plurality of ejector pins (32), the ejector pins (23) and the ejector pins (32) are both inserted into the mold core (12), and an ejection assembly (5) passes through the primary ejection plate group (2) and abuts against the bottom surface of the secondary ejection plate group (31), characterized in that: Insert one (411) is fixedly provided on both sides of the mold frame (11), and insert two (421) corresponding to insert one (411) is fixedly provided on both sides of the primary ejection plate group (2). A step one (422) is provided on the side of the insert two (421), and insert three (431) is clamped on the step one (422). The insert three (431) is horizontally arranged on the side of the secondary ejection plate group (31), and an elastic member (44) is provided between the insert three (431) and the secondary ejection plate group (31). A slope one (413) is provided on the side of the insert one (411) close to the insert three (431), and a slope two (433) cooperating with the slope one (413) is provided on one side of the insert three (431), and the slope one (413) is located above the step one (422).

2. The secondary ejection structure of an injection mold according to claim 1, characterized in that: One end of the insert one (411) is fixedly arranged on the upper end of the mold frame (11), and a bar hole (412) with one end open is arranged at a position corresponding to the position of the insert two (421), and the insert two (421) is placed in the bar hole (412), and a step two (432) corresponding to the step one (422) is arranged in the middle of the insert three (431), and the inclined surface two (433) is arranged on both sides of the step two (432).

3. The secondary ejection structure of an injection mold according to claim 2, characterized in that: The mold frame (11) comprises a corresponding upper and lower pad (111) and a bottom plate (112); a plurality of guide columns (113) are arranged between the pad (111) and the bottom plate (112); the guide columns (113) respectively pass through a primary ejection plate group (2) and a secondary ejection plate group (31); the primary ejection plate group (2) comprises an ejection plate 1 (21) and an ejection plate 2 (22) arranged upper and lower; a step 3 (114) is arranged at the ejection plate 1 (21); and a step 4 (24) cooperating with the step 3 (114) is arranged at the bottom of the guide column (113).

4. The secondary ejection structure of an injection mold according to claim 3, characterized in that: The two sides of the ejection plate 1 (21) and the ejection plate 2 (22) are respectively fixedly connected to the insert 2 (421).

5. The secondary ejection structure of an injection mold according to claim 4, characterized in that: A plurality of positioning columns (33) are provided on the upper surface of the secondary ejection plate group (31), and the positioning columns (33) can be inserted into the pad (111). A spring (34) is sleeved on the positioning columns (33), and two ends of the spring (34) are respectively against the secondary ejection plate group (31) and the pad (111).

6. The secondary ejection structure of an injection mold according to claim 5, characterized in that: A second spring is provided between the second ejection plate (22) and the bottom plate (112), and the second spring is sleeved on the guide column (113).

7. The secondary ejection structure of an injection mold according to claim 1, characterized in that: The outer side surfaces of the insert 1 (411), the insert 2 (421) and the mold frame (11) are flush.

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