Delayed ejection mechanism of injection mold

Abstract

The utility model discloses a delayed ejection mechanism of an injection mold. The delayed ejection mechanism comprises a push plate, a fixed plate and an ejector plate assembly which are sequentially arranged from top to bottom, the ejector plate assembly is connected with the push plate through the reset rod assembly; a core rod extending out of the push plate is arranged on the fixed plate; a step ejector rod is arranged in the core rod in an up-down moving mode, and the tail end of the step ejector rod is movably arranged in the ejector pin plate assembly. The delayed ejection mechanism of the injection mold is provided with the core rod, the push plate and the step ejector rod; during ejection, the ejector plate assembly pushes the push plate to move for a certain distance to enable the push plate to be in contact with an injection product, and then the step ejector rod which is movably arranged is utilized to eject the product and a runner together with the push plate, so that product defects caused by the fact that the runner of the product moves first in the ejection process are avoided, the structure is simple, installation is convenient, and production efficiency is improved. And the applicability is good.

Description

Technical Field

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

[0002] When an injection mold injects a product, an ejection mechanism is required to eject the product from the injection mold. Common ejection methods include ejector pin ejection, ejector plate ejection, and combined ejection of ejector pins and ejector plates. However, when it comes to ejector plate ejection, the process of the ejector plate contacting the product and the runner during the ejection process is not synchronous, resulting in the runner being ejected first, which causes the product to be pulled and deformed due to the runner's prior movement, leading to defects in the product.

[0003] Therefore, it is necessary to design a delayed ejection mechanism for an injection mold to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to address the problem that when using an ejector plate to eject a product in the prior art, defects occur in the product due to the prior movement of the runner, and a delayed ejection mechanism for an injection mold is proposed.

[0005] The technical solution of the utility model is: a delayed ejection mechanism for an injection mold, including an ejector plate, a fixed plate, and a thimble plate assembly arranged in sequence from top to bottom; the thimble plate assembly is connected to the ejector plate through a reset rod assembly; a core rod extending out of the ejector plate is provided on the fixed plate; a stepped ejector rod is movably arranged up and down inside the core rod, and the tail end of the stepped ejector rod is movably arranged in the thimble plate assembly.

[0006] An installation groove is provided at the bottom of the fixed plate; an fixed plate limit block for limiting the core rod and the stepped ejector rod on the fixed plate is provided in the installation groove; a limit counterbore is provided on the fixed plate limit block; a limit ring platform cooperating with the limit counterbore is provided on the stepped ejector rod.

[0007] The thimble plate assembly includes a thimble plate and a thimble fixed plate arranged at the bottom of the thimble plate; a stepped hole for the tail end of the stepped ejector rod to extend into is provided on the thimble plate; the tail end of the stepped ejector rod is arranged in the stepped hole through a screw sleeve; a delayed counterbore is provided on the thimble fixed plate corresponding to the stepped hole.

[0008] The inside of the core rod has a stepped through hole that is larger at the bottom and smaller at the top; the stepped ejector rod is slidably connected to the stepped through hole of the core rod.

[0009] The reset rod assembly includes four reset rods distributed in a rectangular shape on the thimble plate assembly; the reset rods abut against the bottom of the ejector plate; a limit stepped hole is provided on the ejector plate corresponding to the reset rods; a ejector plate limit block is provided in the limit stepped hole; a connecting screw is connected between the ejector plate limit block and the top of the reset rod; a reset spring is provided between the ejector plate and the thimble plate assembly.

[0010] Guide posts are provided at the four corners of the fixed plate; guide sleeves respectively slidingly engaged with the four guide posts are provided at the four corners of the push plate.

[0011] Guide rods slidingly engaged with the ejector pin plate assembly are symmetrically provided at the bottom of the fixed plate.

[0012] Adopting the above technical solution, the utility model has the following beneficial effects: The injection mold delayed ejection mechanism of the utility model is provided with a core rod, a push plate and a stepped ejector rod; during ejection, the push plate is first pushed by the ejector pin plate assembly to move a certain distance, so that the push plate contacts the injection product, and then the movably arranged stepped ejector rod is used to eject the product and the runner together with the push plate, thereby avoiding product defects caused by the prior movement of the product runner during the ejection process. It not only has a simple structure, is convenient to install, but also has good applicability. Description of the Drawings

[0013] In order to make the content of the utility model easier to be clearly understood, the following further details the utility model according to specific embodiments and in conjunction with the drawings.

[0014] Figure 1 It is a schematic structural diagram of the utility model.

[0015] Figure 2 It is a sectional view of the utility model.

[0016] Figure 3 It is another visual sectional view of the utility model.

[0017] The reference numerals in the drawings are:

[0018] Push plate 1, fixed plate 2, ejector pin plate assembly 3, ejector pin plate 3-1, ejector pin fixing plate 3-2, return rod assembly 4, return rod 4-1, push plate limit block 4-2, connecting screw 4-3, core rod 5, stepped ejector rod 6, limit ring platform 6-1, fixed plate limit block 7, limit counterbore 7-1, screw sleeve 8, delay counterbore 9, guide post 10, guide sleeve 11, guide rod 12. Detailed Description of the Invention

[0019] (Embodiment 1)

[0020] See Figures 1 to 3 , a delayed ejection mechanism of an injection mold in this embodiment includes a push plate 1, a fixed plate 2 and an ejector pin plate assembly 3 arranged in sequence from top to bottom; the ejector pin plate assembly 3 is connected to the push plate 1 through a return rod assembly 4; a core rod 5 extending out of the push plate 1 is provided on the fixed plate 2; a stepped ejector rod 6 is movably arranged up and down inside the core rod 5, and the tail end of the stepped ejector rod 6 is movably arranged in the ejector pin plate assembly 3.

[0021] Further, in order to facilitate the installation of the core rod 5 and the stepped ejector rod 6, an installation groove is provided at the bottom of the fixed plate 2; a fixed plate limiting block 7 for limiting the core rod 5 and the stepped ejector rod 6 on the fixed plate 2 is provided in the installation groove; a limiting counterbore 7-1 is provided on the fixed plate limiting block 7; a limiting ring platform 6-1 cooperating with the limiting counterbore 7-1 is provided on the stepped ejector rod 6.

[0022] The ejector plate assembly 3 includes an ejector plate 3-1 and an ejector pin fixed plate 3-2 provided at the bottom of the ejector plate 3-1; a stepped hole for the tail end of the stepped ejector rod 6 to extend into is provided on the ejector plate 3-1; the tail end of the stepped ejector rod 6 is arranged in the stepped hole through a screw sleeve 8; a delay counterbore 9 is provided on the ejector pin fixed plate 3-2 corresponding to the stepped hole. Through the cooperation of the limiting ring platform 6-1 and the limiting counterbore 7-1, the position of the stepped ejector rod 6 can be limited, thereby preventing the stepped ejector rod 6 from falling into the delay counterbore 9 and ensuring the delayed ejection of the stepped ejector rod 6.

[0023] Further, in order to facilitate the installation of the stepped ejector rod 6 and the stability of the movement of the stepped ejector rod 6, the inside of the core rod 5 has a stepped through hole that is larger at the bottom and smaller at the top; the stepped ejector rod 6 is slidably connected in the stepped through hole of the core rod 5.

[0024] Further, in order to facilitate the reset of the push plate 1, the reset rod assembly 4 includes four reset rods 4-1 distributed in a rectangular shape on the ejector plate assembly 3; the reset rods 4-1 abut against the bottom of the push plate 1; a limiting stepped hole is provided on the push plate 1 corresponding to the reset rods 4-1; a push plate limiting block 4-2 is provided in the limiting stepped hole; the push plate limiting block 4-2 and the top of the reset rods 4-1 are connected by a connecting screw 4-3; a reset spring 4-4 is provided between the push plate 1 and the ejector plate assembly 3.

[0025] Further, in order to ensure the stability of the movement of the push plate 1, guide posts 10 are provided at the four corners of the fixed plate 2; guide sleeves 11 that are slidably matched with the four guide posts 10 are respectively provided at the four corners of the push plate 1.

[0026] Further, in order to ensure the stability of the movement of the ejector plate assembly 3, guide rods 12 that are slidably matched with the ejector plate assembly 3 are symmetrically provided at the bottom of the fixed plate 2.

[0027] The injection mold delayed ejection mechanism of this embodiment is provided with a core rod 5, a push plate 1 and a stepped ejector rod 6; during ejection, first, the ejector plate assembly 3 is used to push the push plate 1 to move a certain distance so that the push plate 1 contacts the injection product, and then the movably arranged stepped ejector rod 6 is used to eject the product and the runner together with the push plate 1, thereby avoiding product defects caused by the prior movement of the product runner during the ejection process. It not only has a simple structure, is convenient to install, but also has good applicability.

[0028] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present utility model. It should be understood that the above description is only for the specific embodiments of the present utility model and does not limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A delayed ejection mechanism for an injection mold, characterized in that: It includes a push plate (1), a fixed plate (2), and an ejector pin plate assembly (3) arranged successively from top to bottom; the ejector pin plate assembly (3) is connected to the push plate (1) through a reset rod assembly (4); a core rod (5) extending out of the push plate (1) is provided on the fixed plate (2); a stepped ejector rod (6) is movably arranged up and down inside the core rod (5), and the tail end of the stepped ejector rod (6) is movably arranged in the ejector pin plate assembly (3).

2. The delayed ejection mechanism of an injection mold according to claim 1, characterized in that: An installation groove is provided at the bottom of the fixed plate (2); a fixed plate limit block (7) for limiting the core rod (5) and the stepped ejector rod (6) on the fixed plate (2) is provided in the installation groove; a limit counterbore (7-1) is provided on the fixed plate limit block (7); a limit ring platform (6-1) cooperating with the limit counterbore (7-1) is provided on the stepped ejector rod (6).

3. The delayed ejection mechanism of an injection mold according to claim 1, characterized in that: The ejector pin plate assembly (3) includes an ejector pin plate (3-1) and an ejector pin fixed plate (3-2) provided at the bottom of the ejector pin plate (3-1); a stepped hole for the tail end of the stepped ejector rod (6) to extend into is provided on the ejector pin plate (3-1); the tail end of the stepped ejector rod (6) is arranged in the stepped hole through a screw sleeve (8); a delay counterbore (9) is provided on the ejector pin fixed plate (3-2) corresponding to the stepped hole.

4. The delayed ejection mechanism of an injection mold according to claim 1, characterized in that: The inside of the core rod (5) has a stepped through hole that is larger at the bottom and smaller at the top; the stepped ejector rod (6) is slidably connected to the stepped through hole of the core rod (5).

5. The delayed ejection mechanism of an injection mold according to claim 1, characterized in that: The reset rod assembly (4) includes four reset rods (4-1) distributed in a rectangular shape on the ejector pin plate assembly (3); the reset rods (4-1) abut against the bottom of the push plate (1); a limit stepped hole is provided on the push plate (1) corresponding to the reset rods (4-1); a push plate limit block (4-2) is provided in the limit stepped hole; a connecting screw (4-3) is connected between the push plate limit block (4-2) and the top of the reset rod (4-1); a reset spring (4-4) is provided between the push plate (1) and the ejector pin plate assembly (3).

6. The delayed ejection mechanism of an injection mold according to claim 1, characterized in that: Guide posts (10) are provided at the four corners of the fixed plate (2); guide sleeves (11) slidably cooperating with the four guide posts (10) are respectively provided at the four corners of the push plate (1).

7. The delayed ejection mechanism of an injection mold according to claim 1, characterized in that: Guide rods (12) slidably cooperating with the ejector pin plate assembly (3) are symmetrically provided at the bottom of the fixed plate (2).

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