CN111619078A

CN111619078A - Ejection mechanism and injection mold with same

Info

Publication number: CN111619078A
Application number: CN202010744414.0A
Authority: CN
Inventors: 刘扬; 王翔翔; 娄开尧; 王海明; 方财福; 吴鸿波; 应华梁; 刘赛科; 李恒青; 徐利永
Original assignee: Ningbo Fangzheng Tool Co Ltd
Current assignee: Ningbo Fangzheng Tool Co Ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2020-09-04
Anticipated expiration: 2040-07-29
Also published as: CN111619078B

Abstract

The invention relates to the technical field of demoulding of injection products, and provides an ejection mechanism and an injection mould with the same. The ejection mechanism is applied to an injection mold, the bottom of the ejector pin is driven by the sliding seat to move to the position above the boss along the slide way, the ejector pin is lifted upwards by the boss, the ejector pin ejects the molded surface of a molded product upwards, the molded product is separated from the insert pin, and the quality of injection molding holes such as a screw column, an exhaust hole and the like is ensured.

Description

Ejection mechanism and injection mold with same

Technical Field

The invention relates to the technical field of demoulding of injection products, in particular to an ejection mechanism and an injection mould with the ejection mechanism.

Background

The injection molding product is usually ejected by an ejector pin when the mold is opened. The automobile bumper shell is generally provided with a screw post, and the position of the screw post is deeper in the shell. The ejector pin is inconvenient to directly place at the position of the die corresponding to the screw column, so that the screw column on the shell cannot be ejected out by the ejector pin.

Disclosure of Invention

The invention aims to solve the technical problem of providing an ejection mechanism, wherein an ejector pin is arranged in a mold according to the position of a screw post, and the ejector pin is driven by the ejection mechanism to eject the screw post.

The technical scheme includes that the ejection mechanism comprises a slide way arranged on a movable die, a sliding seat arranged on a fixed die and a thimble, wherein the slide way is provided with a boss, the sliding seat is provided with an insert pin and a through hole arranged in parallel with the insert pin, the bottom end of the thimble extends out of the through hole, the top end of the thimble is abutted against the molded surface of a molded product, the sliding seat is opposite to the front surface of the slide way, and the sliding seat can drive the thimble to move to the position above the boss along the slide way.

Compared with the prior art, the ejection mechanism has the following advantages: the sliding seat drives the bottom of the ejector pin to move to the position above the boss along the slide way, the boss lifts the ejector pin upwards, the ejector pin pushes out the molded surface of the molded product upwards, and the molded product is separated from the insert pin, for example, a screw column is separated from the screw column insert pin, or an exhaust hole is separated from an exhaust insert pin.

Preferably, the boss is provided with a guide inclined plane, and the thimble can move to the upper part of the boss along the guide inclined plane. By adopting the structure, the thimble can smoothly move to the upper part of the boss along the guide inclined plane, and the resistance of the thimble moving to the upper part of the boss is reduced.

Preferably, the sliding seat is further provided with a spring limiting part located right above the through hole, the middle part of the ejector pin is provided with a limiting table, the ejector pin is sleeved with a spring, and the spring is limited between the spring limiting part and the limiting table. By adopting the structure, the thimble can move downwards when leaving the boss and is separated from the molded surface of the molded product by utilizing the elastic potential energy of the spring.

Preferably, a step surface matched with the limiting table is arranged in the through hole, and the limiting table is limited between the step surface and the spring. By adopting the structure, the thimble can be prevented from being separated from the through hole in the movement process.

Preferably, the movable die is further provided with a guide table along the direction of the slide way, and the sliding seat is provided with a sliding surface matched with the guide table. By adopting the structure, the sliding seat can be accurately controlled to move above the slideway.

Another technical problem to be solved by the present invention is to provide an injection mold, wherein an ejection mechanism is arranged in the injection mold and is used for ejecting a screw post.

The invention provides an injection mold, which comprises a fixed mold, a movable mold and the ejection mechanism.

In the prior art, when a mould is demolded, if the demolding inclination of a cavity or a core of the mould is too small or the smoothness of the cavity or the core of the mould is not good, an insert pin is likely to be broken due to excessive stress. By applying the injection mold disclosed by the invention, the molded surface of the molded product can be ejected upwards by the ejector pin before the product is demolded, so that the molded product is separated from the insert pin in advance, the problem of excessive glue or blockage in injection molded part holes caused by the breakage of the insert pin in the product during demolding is avoided, and the quality of injection molded holes such as screw columns or exhaust holes is ensured.

Drawings

Fig. 1 is a schematic structural view of an injection mold with an ejection mechanism according to the present invention.

Fig. 2 is a schematic structural diagram of the ejection mechanism of the present invention in an injection mold.

Fig. 3 is a schematic view of the connection between the ejection mechanism and the molded product according to the present invention.

Fig. 4 is a schematic front view of the molded product.

Fig. 5 is a schematic view of the connection between the ejector mechanism and the movable mold according to the present invention.

Fig. 6 is an enlarged view of the ejection mechanism of fig. 5.

Fig. 7 is a schematic structural diagram of the ejection mechanism of the present invention.

Fig. 8 is a schematic structural view of the back surface of the ejection mechanism of the present invention.

Fig. 9 is a schematic structural view of the ejector pin in the ejection mechanism of the present invention.

Fig. 10 is a schematic structural view of the ejector pin and the sliding seat in the ejection mechanism of the present invention.

As shown in the figure: 1. the device comprises a fixed die, 2 parts of a movable die, 3 parts of a molded product, 3-1 parts of a screw post, 3-2 parts of an exhaust hole, 4 parts of an ejection mechanism, 4-1 parts of a sliding seat, 4-2 parts of an insert pin, 4-3 parts of an ejector pin, 4-4 parts of a spring, 4-5 parts of a boss, 4-6 parts of a guide table, 4-7 parts of a slide way, 4-8 parts of a sliding surface, 4-9 parts of a limiting table, 4-10 parts of a sliding rod, 4-11 parts of an exhaust insert pin, 4-12 parts of a through hole, 4-13 parts of a step surface.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Further, when a statement such as "… at least one" appears after the list of listed features, the entire listed feature is modified rather than modifying individual elements in the list.

As shown in fig. 1 to 10, the injection mold for the automobile bumper shell comprises a fixed mold 1 and a movable mold 2, and a screw post 3-1 is further formed on a molded product 3. An ejection mechanism 4 for ejecting the screw post 3-1 is arranged in the injection mold, as shown in fig. 2 to 10, the ejection mechanism 4 comprises a slide way 4-7 arranged on the movable mold 2, a boss 4-5 is arranged at one end of the slide way 4-7, and a guide inclined plane is arranged on the boss 4-5. The ejection mechanism 4 further comprises an ejector pin 4-3 and a sliding seat 4-1 arranged on the fixed die 1, a limiting table 4-9 is arranged in the middle of the ejector pin 4-3, a sliding rod 4-10 is arranged below the limiting table 4-9, the sliding seat 4-1 is opposite to the front side of a sliding way 4-7, an insert pin 4-2, a through hole 4-12 in the direction parallel to the insert pin 4-2 and a spring pipeline (not shown) positioned right above the through hole 4-12 are arranged on the sliding seat 4-1, a spring limiting part is arranged at the top of the spring pipeline, the insert pin 4-2 is used for molding the screw post 3-1 and is adhered to the molded screw post 3-1, a step surface 4-13 matched with the limiting table 4-9 is arranged in the through hole 4-12, and the sliding rod 4-10 is arranged in the through hole 4-12, the thimble 4-3 is sleeved with a spring 4-4, the spring 4-4 is limited in the spring pipeline, the thimble 4-3 extends upwards out of the spring pipeline and abuts against the molded surface of the molded product 3, two ends of the spring 4-4 respectively abut against the spring limiting part and the upper end surface of the limiting table 4-9, the limiting table 4-9 is limited between the step surface 4-13 and the spring 4-4, and the length of the sliding rod 4-10 is larger than the hole depth of the through hole 4-12. The moving die 2 is close to the slide ways 4-7 and is also provided with guide tables 4-6 along the direction of the slide ways 4-7, and the sliding seat 4-1 is provided with sliding surfaces 4-8 matched with the guide tables 4-6. When the sliding surface 4-8 is matched on the guide table 4-6 and the sliding seat 4-1 moves along the guide table 4-6, the bottom end of the sliding rod 4-10 slides on the sliding rail 4-7 and can slide to the boss 4-5 along the guide inclined surface on the boss 4-5. The spring limiting part can be a protruding structure on the inner wall of the spring pipeline.

The working principle of the ejection mechanism of the invention is as follows: before opening the die, the fixed die 1 and the movable die 2 move relatively, the sliding surface 4-8 on the sliding seat 4-1 is matched on the guide table 4-6 and moves towards the boss 4-5 along the guide table 4-6, the sliding seat 4-1 drives the insert pin 4-2 and the thimble 4-3 to move towards the boss 4-5 together, the bottom end of the sliding rod 4-10 slides on the slideway 4-7 until sliding onto the boss 4-5 along the inclined plane, the boss 4-5 jacks up the sliding rod 4-10, at the moment, the limiting table 4-9 compresses the spring 4-4 along the direction of the spring pipeline, the thimble 4-3 jacks up the molded surface of the molded product 3, so that the screw post 3-1 on the molded product 3 is separated from the insert pin 4-2, namely the screw post 3-1 is pushed up by the thimble 4-3; then, the sliding surface 4-8 on the sliding seat 4-1 is continuously matched with the guide table 4-6 and moves towards the direction far away from the boss 4-5 along the guide table 4-6, the bottom end of the sliding rod 4-10 slides downwards along the inclined plane after leaving the boss 4-5, the acting force of the bottom end of the sliding rod 4-10 is gradually reduced until the acting force disappears, the spring 4-4 releases elastic potential energy, the limiting table 4-9 moves downwards under the action of the spring, and the ejector pin 4-3 simultaneously moves downwards to be separated from the molded surface of the molded product 3. At this time, the molded product 3 is completely released.

When the ejection mechanism is applied to an injection mold, the ejector pin can eject the screw column arranged in the deep part of the product before the injection molding product is demoulded, so that the screw column is separated from the insert pin. Similarly, if the exhaust hole 3-2 is provided in the injection molded product, the exhaust pin 4-11 may be provided on the sliding seat 4-1, and the exhaust hole 3-2 provided deep inside the product may be separated from the exhaust pin 4-11 by the ejector pin.

The above are merely preferred embodiments of the present invention, and are not intended to limit the scope of the invention; it is intended that the following claims be interpreted as including all such alterations, modifications, and equivalents as fall within the true spirit and scope of the invention.

Claims

1. An ejection mechanism is characterized by comprising a slide way (4-7) arranged on a movable die, a slide seat (4-1) arranged on a fixed die and a thimble (4-3), wherein the slide way (4-7) is provided with a boss (4-5), the slide seat (4-1) is provided with an insert needle (4-2), the through hole (4-12) is arranged in parallel with the insert pin (4-2), the bottom end of the insert pin (4-3) extends out of the through hole (4-12), the top end of the insert pin (4-3) is abutted against the molded surface of a molded product, the sliding seat (4-1) is opposite to the front face of the slide way (4-7), and the sliding seat (4-1) can drive the insert pin (4-3) to move to the position above the boss (4-5) along the slide way (4-7).

2. Ejection mechanism according to claim 1, characterized in that the projection (4-5) is provided with a guide ramp along which the ejector pin (4-3) can be moved over the projection (4-5).

3. The ejection mechanism according to claim 1, wherein the sliding seat (4-1) is further provided with a spring limiting member located right above the through hole (4-12), the middle part of the ejector pin (4-3) is provided with a limiting table (4-9), the ejector pin (4-3) is sleeved with the spring (4-4), and the spring (4-4) is limited between the spring limiting member and the limiting table (4-9).

4. The ejection mechanism according to claim 3, wherein a step surface (4-13) is provided in the through hole (4-12) to be engaged with the stopper table (4-9), and the stopper table (4-9) is held between the step surface (4-13) and the spring (4-4).

5. The ejection mechanism according to claim 1, characterized in that the movable mold is further provided with a guide table (4-6) along the direction of the slide way (4-7), and the sliding seat (4-1) is provided with a sliding surface (4-8) matched with the guide table (4-6).

6. An injection mold comprising a fixed mold, a movable mold, and the ejector mechanism according to any one of claims 1 to 5.