CN221112723U

CN221112723U - Injection mold ejection structure

Info

Publication number: CN221112723U
Application number: CN202322903574.7U
Authority: CN
Inventors: 叶彬; 史铭
Original assignee: Hubei Tri Ring Auto Engineering Plastics Co ltd
Current assignee: Hubei Tri Ring Auto Engineering Plastics Co ltd
Priority date: 2023-10-30
Filing date: 2023-10-30
Publication date: 2024-06-11
Anticipated expiration: 2033-10-30

Abstract

The utility model relates to an ejection structure of an injection mold, which comprises a fixed mold seat plate, a hot runner plate, a fixed mold cavity plate and a movable mold core plate which are sequentially arranged from top to bottom, wherein the hot runner plate and the fixed mold cavity plate are buckled to form an injection mold cavity for molding a product; the fixed die cavity plate is connected with the movable die core plate through a tail plate assembly, a top plate and a tail plate are arranged on the movable die core plate, a plurality of countersunk holes for installing ejector pins are formed in the top plate, a plurality of adjusting holes for installing ejector pins are formed in the tail plate, and the adjusting holes are arranged opposite to the countersunk holes. According to the utility model, as the anti-withdrawal jackscrew is added at the tail part of the ejector pin, the gap between the head part of the jackscrew and the ejection back plate is reserved, so that the ejector pin is not synchronous with the action of the ejector plate, the ejection action is delayed, and the stress marks on the surface of a plastic part are eliminated, thereby reducing the rejection rate in the injection molding process and greatly improving the production efficiency due to the process debugging time.

Description

Injection mold ejection structure

Technical Field

The utility model relates to the technical field of automobile injection mold design, in particular to an injection mold ejection structure.

Background

In the process of ejecting a common injection molding part, an ejection mechanism of an injection molding machine pushes a mold ejector plate, and a mold ejector pin synchronously ejects the ejector plate simultaneously.

In chinese patent CN 104227998B, a twice ejecting injection mold is provided, the product is ejected by twice ejecting, the part of the ejector sleeve top is the thinner part of the product, the part of the ejector sleeve top is the thicker part of the product, the strokes of the ejector sleeve and the ejector sleeve are separately designed, the stroke of the whole mold is shortened, the wall thickness of the front section of the ejector sleeve corresponding to the thinner part of the product is shorter due to the shortening of the stroke, the strength of the ejector sleeve is ensured, the phenomena of breakage of the ejector sleeve and the like are not easy to occur during production, and the service life of the mold is prolonged.

However, in the ejection process of injection molding parts, stress marks on the surface of the product, which are generated by the action of the ejector pins, are generated, so that the appearance of the product is disqualified, and scrapping or post stress relief treatment is needed.

Therefore, under the condition of not increasing the production cost and the reworking cost additionally, how to realize the appearance of the plastic part without ejection stress marks is a hard requirement which must be overcome.

Disclosure of utility model

The utility model provides an ejection structure of an injection mold, which realizes that the reworking cost is not additionally increased, greatly reduces the difficulty of injection molding machine adjustment, and realizes the process feasibility of low-difficulty machine adjustment and related technical problems.

According to one aspect of the utility model, there is provided an injection mold ejection structure comprising a fixed mold base plate, a hot runner plate, a fixed mold cavity plate and a movable mold core plate which are sequentially arranged from top to bottom, wherein: the hot runner plate and the fixed die cavity plate are buckled to form an injection molding cavity for molding a product; the fixed die cavity plate is connected with the movable die core plate through a tail plate assembly, a top plate and a tail plate are arranged on the movable die core plate, a plurality of countersunk holes for installing ejector pins are formed in the top plate, a plurality of adjusting holes for installing jackscrews are formed in the tail plate, the adjusting holes are opposite to the countersunk holes, the aperture of one side of the countersunk holes, which is close to the tail plate, is larger than the aperture of one side of the fixed die cavity plate, and the height of the jackscrews is smaller than that of the tail plate.

On the basis of the scheme, preferably, four corners of the thimble backboard extend outwards to form connecting wings, an air cylinder is arranged on the connecting wings, and a telescopic rod of the air cylinder is fixedly connected with the movable model core plate.

On the basis of the scheme, preferably, the top plate and the tail plate are connected through bolts.

According to the ejection structure of the injection mold, disclosed by the utility model, the ejector plate provided with the ejector pins is modified, and the movable ejector pins on the tail plate are added, so that the ejector pin ejection action delay and ejector pin withdrawal synchronous injection mold structural design can be realized during ejection of the injection mold.

According to the utility model, as the anti-withdrawal jackscrew is added at the tail part of the ejector pin, the gap between the head part of the jackscrew and the ejection back plate is reserved, so that the ejector pin is not synchronous with the action of the ejector plate, the ejection action is delayed, and the stress marks on the surface of a plastic part are eliminated, thereby reducing the rejection rate in the injection molding process and greatly improving the production efficiency due to the process debugging time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:

FIG. 1 is a schematic diagram of an injection mold ejection structure of the present utility model;

FIG. 2 is a block diagram of the injection mold ejection structure of the present utility model with the tail plate removed;

FIG. 3 is a block diagram of the ejection structure of the injection mold of the present utility model with the top plate removed;

reference numerals illustrate:

The hot runner plate 20, the fixed mold cavity plate 30, the movable mold core plate 40, the top plate 50, the thimble 51, the counter bore 52, the cylinder 53, the tail plate 60, the jackscrews 61, the adjusting holes 62 and the thimble backboard 70.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, 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.

For the sake of simplicity of the drawing, the parts relevant to the present utility model are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

In the embodiment shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various components of the utility model are not absolute but relative. These descriptions are appropriate when the components are in the positions shown in the drawings. If the description of the location of these components changes, then the indication of these directions changes accordingly.

In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will explain the specific embodiments of the present utility model with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the utility model, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

Referring to fig. 1, and referring to fig. 2 and 3, the ejection structure of an injection mold of the present utility model includes a fixed mold base plate 10, a hot runner plate 20, a fixed mold cavity plate 30, and a movable mold core plate 40 sequentially disposed from top to bottom, wherein: the hot runner plate 20 and the fixed die cavity plate 30 are buckled to form an injection molding cavity for molding a product; the fixed die cavity plate 30 is connected with the tail plate 60 through the movable die core plate 40, a top plate 50 and a thimble backboard 70 are arranged on the movable die core plate 40, a plurality of countersunk holes 52 for installing the thimble 51 are arranged on the top plate 50, a plurality of adjusting holes 62 for installing the jackscrews 61 are arranged on the thimble backboard 70, the adjusting holes 62 are opposite to the countersunk holes 52, the aperture of one side of the countersunk holes 52 close to the tail plate 60 is larger than the aperture of one side of the countersunk holes 52 close to the fixed die cavity plate 30, and the height of the jackscrews 61 is smaller than that of the tail plate 60.

As shown in FIG. 1, four corners of a tail plate 60 of the present utility model are extended outwardly to form connection wings, on which an air cylinder is mounted, a telescopic rod of the air cylinder is fixedly connected with a movable mold core plate 40, and a top plate 50 and the tail plate 60 are connected by bolts.

According to the ejection structure of the injection mold, the movable mold core plate 40, the top plate 50 and the tail plate 60 are fastened together through bolts.

During operation, the movable mould of the mould is moved by opening the mould of the injection molding machine, and is moved out of the fixed mould cavity, and the movable mould core plate 40 is separated from the fixed mould cavity plate 30;

According to the ejection structure of the injection mold, after the movable mold is opened to a final position, the telescopic rod of the air cylinder 53 stretches out, so that the top plate 50 starts to displace forwards to drive the ejector pins 51 to eject from the driven mold core plate 40;

According to the ejection structure of the injection mold, in the initial stage of displacement of the top plate 50, because of the design clearance between the adjusting hole 62 and the ejector wire 61, the ejector pin 51 is temporarily stopped, and the partial action delay phenomenon of the ejector pin 51 at the position required by design is formed;

According to the ejection structure of the injection mold, after the ejection process is finished, the telescopic rod of the air cylinder 53 is retracted, the top plate 50 is driven to start to move backwards, and the ejector pins 51 are synchronously driven to retract into the movable mold core plate 40;

According to the ejection structure of the injection mold, when the top plate 50 is retracted to the final position, the ejector pins 61 are in preferential contact with the ejector pin backboard 70, the front ends of the ejector pins 61 are propped against the tail ends of the ejector pins 51, so that the ejector pins 51 stop moving, and the front ends of the ejector pins 51 are coplanar with the front surface of the movable mold core plate 40;

According to the injection mold ejection structure, the ejector plate 50 provided with the ejector pins 51 is modified, and the movable ejector pins 61 on the ejector pin backboard 70 are added, so that the ejector pin 51 ejection action delay and ejector pin 51 withdrawal synchronization injection mold structural design are realized during injection mold ejection.

According to the utility model, as the anti-withdrawal jackscrew 61 is added at the tail part of the ejector pin 51, the gap between the head part of the jackscrew 61 and the ejection back plate is reserved, so that the ejector pin 51 is not synchronous with the action of the ejector pin 51 plate, the ejection action is delayed, and the stress mark on the surface of a plastic part is eliminated, thereby reducing the rejection rate in the injection molding process and the process debugging time, and greatly improving the production efficiency.

Finally, the method of the present utility model is only a preferred embodiment and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides an injection mold ejection structure, its characterized in that includes cover half bedplate, hot runner plate, cover half die cavity board and the movable mould core that from top to bottom set gradually, wherein: the hot runner plate and the fixed die cavity plate are buckled to form an injection molding cavity for molding a product; the fixed die cavity plate is connected with the tail plate through the movable die core plate, a top plate and a thimble back plate are arranged on the movable die core plate, a plurality of countersunk holes for installing the thimble are formed in the top plate, a plurality of adjusting holes for installing the jackscrews are formed in the thimble back plate, the adjusting holes are opposite to the countersunk holes, the aperture of the countersunk holes, which is close to one side of the tail plate, is larger than the aperture of one side of the fixed die cavity plate, and the height of the jackscrews is smaller than that of the tail plate.

2. The injection mold ejection structure of claim 1, wherein four corners of the ejector pin backboard extend outwards to form connecting wings, an air cylinder is arranged on the connecting wings, and a telescopic rod of the air cylinder is fixedly connected with the movable mold core plate.

3. The injection mold ejection structure of claim 1, wherein the top plate and the tail plate are connected by bolts.