Demolding structure for injection mold

Abstract

The utility model belongs to the technical field of injection molding, and particularly relates to a demolding structure for an injection mold, which comprises a base, a rear mold main body and a front mold main body which are used for injection molding are arranged above the base, the rear mold main body and the front mold main body jointly form an injection molding cavity, and a front mold filling nozzle is arranged on the front mold main body. The injection molding cavity comprises an injection molding filling cavity communicated with the front mold filling nozzle, an ejector sleeve inner needle is movably connected into the rear mold body, an inner needle conical head is fixedly installed at the end, extending into the front mold body, of the ejector sleeve inner needle, and the end, extending into the front mold body, of the inner needle conical head is located in the injection molding filling cavity. A first baffle ring is fixedly installed at the end, away from the inner needle conical head, of the ejector sleeve inner needle, and a first push rod is fixedly installed at the top of the base. According to the demolding structure for the injection mold, the ejector sleeve inner needle is close to the injection molding filling cavity, and the inner needle conical head in the ejector sleeve inner needle is inserted into a to-be-cooled plastic material rod in the injection molding filling cavity, so that the cooling time is effectively shortened by reducing the local material thickness.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to a demolding structure for injection molds. Background Technology

[0002] An injection mold is a tool used for plastic injection molding. Its working principle involves injecting molten plastic into a mold cavity under high pressure, where it cools and solidifies to form the desired plastic product. An injection mold typically consists of two parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, and the fixed mold is mounted on the fixed platen. During injection molding, the moving and fixed molds close to form the gating system and the cavity. When the mold opens, the moving and fixed molds separate to remove the plastic product.

[0003] In existing two-platen injection molds, the plastic thickness at the runner and nozzle junction below the center nozzle is very thick. Whether it is a small mold or a large mold, the material thickness at the center reaches 5-8mm or more, and even 10mm thicker in large molds. This seriously affects the cooling time, causing the injection cycle to be wasted on the cooling time of the main rod. This leads to an increase in product injection costs. If the main rod is not cooled properly, it may break in the mold nozzle when the mold is opened, resulting in extremely unstable production. Utility Model Content

[0004] In order to overcome the defects of the prior art mentioned above, the inventors conducted in-depth research and, after a great deal of creative work, completed this utility model.

[0005] Specifically, the technical problem to be solved by this utility model is to provide a demolding structure for injection molds, so as to solve the technical problem that the material thickness at the center of the current mold is too large, which seriously affects the cooling time, resulting in a long cooling time required for the main rod during the injection cycle, leading to increased product injection costs, and the main rod not cooling properly, or even breaking in the mold nozzle when the mold is opened, resulting in extremely unstable production.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A demolding structure for an injection mold includes a base, with a rear mold body and a front mold body for injection molding disposed above the base, and the rear mold body and the front mold body together forming an injection cavity, and the front mold body is provided with a front mold nozzle;

[0008] The injection chamber includes an injection cavity connected to the front mold nozzle. An inner ejector pin is movably connected in the rear mold body. An inner pin cone is fixedly installed at one end of the inner ejector pin extending into the front mold body. The end of the inner pin cone extending into the front mold body is located in the injection cavity.

[0009] As an improved technical solution, a first retaining ring is fixedly installed at the end of the inner needle of the sleeve away from the inner needle cone, and a first push rod is fixedly installed at the top of the base, with the piston end of the first push rod fixedly connected to the bottom of the first retaining ring.

[0010] As an improved technical solution, the rear mold body is provided with an ejector body along the axial direction of the ejector inner pin, and the ejector body is in clearance fit with the ejector inner pin. A second retaining ring is fixedly installed at one end of the ejector body near the first retaining ring, and the injection cavity also includes an injection channel connected to the injection filling cavity.

[0011] As an improved technical solution, a release template is fixedly installed on the outer side of the second retaining ring. One end of the release template is provided with a second push rod that is parallel to the first push rod. The second push rod is fixedly installed on the top of the base, and the piston end of the second push rod is fixedly connected to the bottom of the release template. The end of the release template away from the second push rod is provided with a guide shaft that is parallel to the second push rod, and the release template and the guide shaft are in clearance fit.

[0012] As an improved technical solution, a first pillar is provided symmetrically between the base and the rear mold body, and the rear mold body is fixedly installed on the top of the base through the first pillar. Second pillars are also symmetrically distributed at both ends of the base, and a positioning seat parallel to the base is fixedly installed at the end of the second pillar away from the base.

[0013] As an improved technical solution, a third push rod is fixedly installed on the top of the positioning seat, and the piston end of the third push rod is fixedly installed on the top of the front mold body.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are:

[0015] 1. This utility model uses an inner needle in the ejector sleeve to approach the injection cavity, and the inner needle cone of the ejector sleeve is inserted into the plastic material rod waiting to be cooled in the injection cavity, thereby reducing the local material thickness and effectively shortening the cooling time.

[0016] 2. In this utility model, the extension of the piston end of the second push rod pushes the ejector plate to move under the restriction of the guide shaft, and drives the ejector body to push the material rod in the injection cavity out from the inner needle cone head, so as to achieve complete separation and ensure that the material rod is ejected smoothly.

[0017] 3. In this utility model, the second push rod pushes the connected demolding platen upward, and the ejector body connected by the second retaining ring pushes the material rod out of the rear mold body, thus completing the demolding. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a three-dimensional structural diagram of the demolding structure for injection molds according to this utility model.

[0020] Figure 2 This is a cross-sectional view of the demolding structure for injection molds according to this utility model.

[0021] Figure 3 This utility model relates to a demolding structure for injection molds. Figure 2 A magnified structural diagram of part A.

[0022] Figure 4 This is a schematic diagram of the ejector pin insertion state of the ejector sleeve of the ejector mold release structure of this utility model.

[0023] Figure 5 This is a cross-sectional view of the ejector pin and ejector body of the ejector sleeve after installation in the ejector sleeve structure for the injection mold of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Base; 2. Rear mold body; 3. Front mold body; 4. Front mold nozzle; 5. Injection cavity; 6. Inner needle of ejector sleeve; 7. Inner needle cone; 8. First retaining ring; 9. First push rod; 10. Ejector sleeve body; 11. Second retaining ring; 12. Injection channel; 13. Demolding plate; 14. Second push rod; 15. Guide shaft; 16. First support column; 17. Second support column; 18. Positioning seat; 19. Third push rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0029] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] like Figures 1 to 5 As shown in the figure, this embodiment provides a demolding structure for injection molds. This demolding structure includes a base 1, with a rear mold body 2 and a front mold body 3 for injection molding located above the base 1. The rear mold body 2 and the front mold body 3 together form an injection chamber. A front mold nozzle 4 is provided on the front mold body 3. The injection chamber includes an injection cavity 5 that communicates with the front mold nozzle 4. An inner ejector pin 6 is movably connected in the rear mold body 2. An inner pin cone 7 is fixedly installed at one end of the inner ejector pin 6 that extends into the front mold body 3. The inner pin cone 7 extends... One end extending into the front mold body 3 is located in the injection cavity 5. The base 1 is used to support the entire mold structure. The front mold nozzle 4 on the front mold body 3 can inject molten plastic into the injection cavity. The injection cavity 5 is set inside the front mold body 3 to contain molten plastic and form a plastic rod after molding. During injection, the ejector pin 6 is inserted into the front mold body 3 to control the injection of plastic. The inner pin cone 7 and the ejector pin 6 are integrally formed and are responsible for inserting into the plastic rod of the injection cavity 5 to reduce the local material thickness and shorten the cooling time.

[0031] A first retaining ring 8 is fixedly installed at the end of the inner needle 6 away from the inner needle cone 7. A first push rod 9 is fixedly installed on the top of the base 1. The piston end of the first push rod 9 is fixedly connected to the bottom of the first retaining ring 8. The first push rod 9 can drive the connected inner needle 6 to move up and down in the front mold nozzle 4 through the first retaining ring 8, thereby pulling out the inner needle cone 7 of the material rod inserted into the injection cavity 5 and pulling the plastic material rod out of the front mold nozzle 4.

[0032] The rear mold body 2 is provided with an ejector body 10 along the axial direction of the ejector inner pin 6, and the ejector body 10 is clearance-fitted with the ejector inner pin 6. A second retaining ring 11 is fixedly installed at one end of the ejector body 10 near the first retaining ring 8. The injection cavity also includes an injection channel 12 connected to the injection filling cavity 5. The ejector inner pin 6 can move vertically up and down along the axial direction of the ejector body 10. The ejector body 10 is responsible for pushing the material rod of the injection filling cavity 5 out of the ejector inner pin 6, so that the plastic material rod can be smoothly separated from the ejector inner pin 6. The injection channel 12 can cooperate with the injection filling cavity 5 to guide the molten plastic in the rear mold body 2 and the front mold body 3, and form the injection molded product after cooling.

[0033] A demolding template 13 is fixedly installed on the outer side of the second retaining ring 11. One end of the demolding template 13 is provided with a second push rod 14 distributed parallel to the first push rod 9. The second push rod 14 is fixedly installed on the top of the base 1, and the piston end of the second push rod 14 is fixedly connected to the bottom of the demolding template 13. The end of the demolding template 13 away from the second push rod 14 is provided with a guide shaft 15 distributed parallel to the second push rod 14, and the demolding template 13 and the guide shaft 15 are clearance-fitted. The demolding template 13 provides support for the second retaining ring 11 to ensure the stability of the ejector body 10 in the rear mold body 2. The demolding template 13 can move up and down in the rear mold body 2 by extending the piston end of the second push rod 14. The ejector body 10 squeezes the material rod in the injection cavity 5 and pushes the material rod out of the rear mold body 2 to complete the demolding of the injection molded product.

[0034] A first support column 16 is symmetrically distributed between the base 1 and the rear mold body 2, and the rear mold body 2 is fixedly installed on the top of the base 1 through the first support column 16. A second support column 17 is also symmetrically distributed at both ends of the base 1. A positioning seat 18 parallel to the base 1 is fixedly installed at the end of the second support column 17 away from the base 1. The first support column 16 provides support for the rear mold body 2 and maintains stability during the injection molding process.

[0035] A third push rod 19 is fixedly installed on the top of the positioning seat 18. The piston end of the third push rod 19 is fixedly installed on the top of the front mold body 3. The third push rod 19 can control the front mold body 3 to rise and fall by extending the piston end, thereby completing the docking and disengagement with the rear mold body 2, making product injection molding more convenient.

[0036] During the injection molding process, molten plastic is injected into the injection chamber through the front mold nozzle 4 in the front mold body 3, and then enters the mold through the injection cavity 5 and injection channel 12. After cooling, it forms a plastic product. The extension of the piston end in the first push rod 9 pushes the inner needle 6 of the ejector sleeve closer to the injection cavity 5, causing the inner needle cone 7 in the inner needle 6 to insert into the plastic rod waiting to cool inside the injection cavity 5. This reduces the local material thickness, effectively shortens the cooling time, and ensures the plastic rod smoothly detaches from the nozzle. Subsequently, the extension of the piston end of the second push rod 14 pushes the ejector plate 13 to move under the constraint of the guide shaft 15, and drives the ejector body 10 to push the plastic rod in the injection cavity 5 from the inner needle cone 7. The ejection process ensures complete separation of the ejector rod and facilitates smooth ejection. During demolding, the first push rod 9 drives the inner pin 6 of the ejector sleeve downward, causing the inner pin cone 7 on the inner pin 6 to be pulled out of the injection cavity 5, thus helping the ejector rod to detach. Simultaneously, the second push rod 14 pushes the connected ejector platen 13 upward, and the ejector body 6 connected by the second retaining ring 11 ejects the ejector rod from the rear mold body 2, completing the demolding. During this process, the first support column 16 and the second support column 17 provide stable support for the base 1 and the rear mold body 2 fixed on the base 1. The third push rod 19 on the positioning seat 18 controls the lifting and lowering of the front mold body 3, completing the docking and disengagement of the front mold body 3 and the rear mold body 2, ensuring the accuracy and smoothness of the injection molding process.

[0037] It is worth noting that the principles of how the plastic is cooled and molded in the injection cavities of the rear mold body 2 and the front mold body 3 involved in this utility model are all existing technologies, which can be easily implemented by those skilled in the art, and therefore require no further explanation. Furthermore, the scope of protection of this utility model does not include improvements to the software and methods, and the morphological changes of the plastic rod during demolding, as well as the yield rate of the demolded product, are determined by the actual usage environment.

[0038] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A demolding structure for an injection mold comprising a base (1), characterized in that: The upper part of the base (1) is provided with a rear mold body (2) and a front mold body (3) for injection molding, and the rear mold body (2) and the front mold body (3) jointly form an injection molding cavity, and the front mold body (3) is provided with a front mold nozzle (4); The injection molding cavity includes an injection molding cavity (5) connected with the front mold nozzle (4), and a needle inner needle (6) is movably connected in the rear mold body (2), one end of the needle inner needle (6) extending into the front mold body (3) is fixedly installed with an inner needle cone head (7), and one end of the inner needle cone head (7) extending into the front mold body (3) is located in the injection molding cavity (5).

2. The demolding structure for an injection mold according to claim 1, characterized by: The end of the needle inner needle (6) away from the inner needle cone head (7) is fixedly installed with a first blocking ring (8), and the top of the base (1) is fixedly installed with a first push rod (9), and the piston end of the first push rod (9) is fixedly connected with the bottom of the first blocking ring (8).

3. The demolding structure for an injection mold according to claim 1, characterized by: The rear mold body (2) is provided with a needle cylinder body (10) along the axial direction of the needle inner needle (6), and the needle cylinder body (10) is gap-fitted with the needle inner needle (6), and one end of the needle cylinder body (10) close to the first blocking ring (8) is fixedly installed with a second blocking ring (11), and the injection molding cavity further includes an injection molding channel (12) connected with the injection molding cavity (5).

4. The demolding structure for an injection mold according to claim 3, characterized by: The outer side of the second blocking ring (11) is fixedly installed with a demolding plate (13), one end of the demolding plate (13) is provided with a second push rod (14) distributed in parallel with the first push rod (9), the second push rod (14) is fixedly installed on the top of the base (1), and the piston end of the second push rod (14) is fixedly connected to the bottom of the demolding plate (13), one end of the demolding plate (13) away from the second push rod (14) is provided with a guide shaft (15) distributed in parallel with the second push rod (14), and the demolding plate (13) is gap-fitted with the guide shaft (15).

5. The demolding structure for an injection mold according to claim 4, characterized by: The base (1) and the rear mold body (2) are provided with symmetrically distributed first support columns (16), and the rear mold body (2) is fixedly installed on the top of the base (1) through the first support columns (16), and the two ends of the base (1) are also symmetrically provided with second support columns (17), and one end of the second support column (17) away from the base (1) is fixedly installed with a positioning seat (18) distributed in parallel with the base (1).

6. The demolding structure for an injection mold according to claim 5, characterized by: The top of the positioning seat (18) is fixedly installed with a third push rod (19), and the piston end of the third push rod (19) is fixedly installed on the top of the front mold body (3).

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