CN105984091B

CN105984091B - Automatic gate breaking structure

Info

Publication number: CN105984091B
Application number: CN201510063505.7A
Authority: CN
Inventors: 王双喜
Original assignee: Suzhou Mitac Precision Technology Co Ltd
Current assignee: Suzhou Mitac Precision Technology Co Ltd
Priority date: 2015-02-06
Filing date: 2015-02-06
Publication date: 2021-01-05
Anticipated expiration: 2035-02-06
Also published as: CN105984091A

Abstract

An automatic gate breaking structure, comprising: the male die insert is arranged in the male die core; one side of the lap-joint type sprue is connected with the runner, the other side of the lap-joint type sprue is arranged on an upper cover of a forming keyboard on the male mold insert, and the lap-joint type sprue is also provided with a false sprue bent downwards; one end of each ejector pin is fixed in the upper ejector plate, and the other end of each ejector pin props against the upper cover of the keyboard; the material grabbing pin is arranged on the lower fixing plate at one end, the other end of the material grabbing pin is abutted to the lower end of the lap joint type pouring gate, a countersunk head is arranged at the position, corresponding to the upper ejection plate, of the material grabbing pin, clearance holes are formed in the upper ejection plate and the lower ejection plate, and the countersunk head is arranged in the clearance holes and has a clearance distance with the lower end face of the clearance holes. According to the automatic gate breaking structure, the overlapped gate is used for replacing the ox horn gate, and the countersunk head is arranged on the material grabbing pin for delayed ejection, so that the overlapped gate is separated from the upper cover and the male mold core of the keyboard, and the problems that the ox horn gate is easy to break and difficult to eject during ejection are solved.

Description

Automatic gate breaking structure

[ technical field ] A method for producing a semiconductor device

The invention relates to an automatic gate breaking structure of a mold, in particular to an automatic gate breaking structure of a lap joint type gate.

[ background of the invention ]

As is well known, the upper cover of a keyboard includes a number of key holes into which key caps are inserted to form the keyboard. The upper cover of keyboard is mostly the plastic material, and when the upper cover of injection moulding keyboard, because the upper cover shape of keyboard is special, can only utilize the button hole feeding among the prior art.

When the upper cover of injection moulding keyboard, adopt ox horn runner to advance gluey more, however, to some less button holes of specification, ox horn runner is breakable when ejecting, difficult ejecting.

In view of the above, there is a need to develop an automatic gate breaking structure to solve the above-mentioned problem that the gate of the horn is easy to break and not easy to eject when the upper cover of the keyboard is formed.

[ summary of the invention ]

Therefore, the invention aims to provide an automatic gate breaking structure, which can solve the problems that when an upper cover of a keyboard is formed, a ox horn gate is easy to break and difficult to eject.

In order to achieve the above object, the present invention provides an automatic gate breaking structure applied to an upper cover of a keyboard formed in a mold, wherein the mold includes a lower fixing plate, a lower ejector plate, an upper ejector plate, a male mold insert, a female mold plate, and a runner, and the automatic gate breaking structure includes:

the male die insert is arranged in the male die core;

one side of the lap-joint type sprue is connected with the runner, the other side of the lap-joint type sprue is arranged on an upper cover of a forming keyboard on the male mold insert, and the lap-joint type sprue is also provided with a false sprue bent downwards;

one end of each ejector pin is fixed in the upper ejector plate, and the other end of each ejector pin penetrates through the male template and the male die core and pushes against the upper cover of the keyboard;

the material grabbing pin is arranged on the lower fixing plate at one end, the other end of the material grabbing pin penetrates through the lower ejection plate, the upper ejection plate, the male mold plate and the male mold insert of the mold and abuts against the lower end of the lap joint type sprue, countersunk heads are arranged at positions, corresponding to the upper ejection plate, of the material grabbing pin, clearance holes are formed in the upper ejection plate and the lower ejection plate, and the countersunk heads are arranged in the clearance holes and have clearance distances with the lower end surfaces of the clearance holes.

Optionally, the material grabbing pin is arranged on the lower fixing plate in a broken mode.

Optionally, the lower end of the lap joint type gate is provided with a hook-shaped notch, and correspondingly, one end of the grabbing pin, which abuts against the lap joint type gate, is provided with a convex block which is matched with the hook-shaped notch.

Compared with the prior art, the automatic gate breaking structure has the advantages that when the upper cover of the keyboard is formed, the overlap gate is used for replacing the ox horn gate, and the countersunk head is arranged on the material grabbing pin for delayed ejection, so that the overlap gate is separated from the upper cover and the male mold core of the keyboard, and the problems that the ox horn gate is easy to break and difficult to eject during ejection are solved.

[ description of the drawings ]

FIG. 1 is a schematic view of an automatic gate-breaking structure according to the present invention.

FIG. 2 is a schematic perspective view of a portion of an automatic gate-breaking structure according to the present invention.

Fig. 3 shows a cross-sectional view of fig. 2.

Fig. 4 is a schematic diagram illustrating a first ejection state of a portion of the gate structure according to the present invention.

FIG. 5 is a schematic diagram illustrating a second ejection state of a portion of the gate structure according to the present invention.

[ detailed description ] embodiments

Referring to fig. 1, fig. 2 and fig. 3, wherein fig. 1 is a schematic view illustrating an automatic gate breaking structure according to the present invention, fig. 2 is a partial perspective view illustrating the automatic gate breaking structure according to the present invention, and fig. 3 is a cross-sectional view illustrating fig. 2.

The automatic gate breaking structure of the present invention is applied to an upper cover 10 of a forming keyboard in a mold, wherein the mold comprises a lower fixing plate 11, a lower ejector plate 12, an upper ejector plate 13, a male mold plate 14, a male mold core 15, a female mold core 16, a female mold plate 17 and a flow channel 18, and in this embodiment, the automatic gate breaking structure comprises:

a male mold insert 19 provided in the male mold core 15;

the lap-type gate 20 is connected with the runner 18 on one side and is arranged on the upper cover 10 of the keyboard formed on the male mold insert 19 on the other side, the lap-type gate 20 is also provided with a false gate 21 bent downwards, and the false gate 21 is used for balancing;

a plurality of thimbles 22, one end of which is fixed in the upper ejector plate 13, and the other end of which penetrates through the core plate 14 and the core insert 15 and is propped against the upper cover 10 of the keyboard;

one end of the material grabbing pin 23 is arranged on the lower fixing plate 11, the other end of the material grabbing pin penetrates through the lower ejection plate 12, the upper ejection plate 13, the male mold plate 14 and the male mold insert 19 of the mold and abuts against the lower end of the lap joint type sprue 20, a countersunk head 24 is arranged at the position of the material grabbing pin 23 corresponding to the upper ejection plate 13, clearance holes 25 are correspondingly arranged on the upper ejection plate 13 and the lower ejection plate 12, and a clearance distance is reserved between the countersunk head 24 and the lower end face of the clearance hole 25.

In order to receive the pressure during injection molding, the material grabbing pin 23 is arranged on the lower fixing plate 11 in a broken way.

In order to better abut against the overlapped gate 20, the lower end of the overlapped gate 20 is provided with a hook-shaped notch, and correspondingly, one end of the material grabbing pin 23 abutting against the overlapped gate 20 is provided with a convex block matched with the hook-shaped notch.

Fig. 4 is a schematic view showing a first ejection state of a portion of the gate structure according to the present invention. After the upper cover 10 of the keyboard is molded, in the ejection process, the upper ejection plate 13 and the lower ejection plate 12 drive the ejector pins 22 to eject, the molded upper cover 10 of the keyboard is ejected upwards, and the countersunk heads 24 of the material grabbing pins 23 have clearance distances with the lower end surfaces of the clearance holes 25, so that the material grabbing pins 23 are ejected in a delayed manner, the lap gate 20 is stationary, and the lap gate 20 is separated from the upper cover 10 of the keyboard under the action of the tensile force of the false gate 21 of the lap gate 20.

Fig. 5 is a schematic diagram illustrating a second ejection state of a portion of the gate structure according to the present invention. After the lap-joint gate 20 is separated from the upper cover 10 of the keyboard, when the countersunk head 24 of the grabbing pin 23 contacts the lower end surface of the clearance hole 25, the grabbing pin 23 is ejected together with the upper ejector plate 13, the lower ejector plate 12 and the ejector pin 22, and the grabbing pin 23 ejects the lap-joint gate 20, so that the lap-joint gate 20 is separated from the male mold insert 19 in the male mold core 15 to complete the demolding action. In addition, the same ejection action can be continuously carried out twice after the ejection is finished, so that the condition that the lap type gate 20 is incompletely dropped occasionally is prevented, and the lap type gate 20 is prevented from being molded.

Compared with the prior art, the automatic gate breaking structure has the advantages that when the upper cover 10 of the keyboard is formed, the overlap gate 20 is used for replacing the ox horn gate, and the countersunk head 24 is arranged on the material grabbing pin 23 for delayed ejection, so that the overlap gate 20 is separated from the formed upper cover 10 of the keyboard and the male mold core 15, and the problems that the ox horn gate is easy to break and difficult to eject during ejection are solved.

Claims

1. The utility model provides an automatic disconnected runner structure, its upper cover that is applied to shaping keyboard in the mould, the mould includes bottom plate, lower ejector plate, goes up ejector plate, public template, public mould benevolence, cavity template and runner, its characterized in that, automatic disconnected runner structure includes:

the male die insert is arranged in the male die core;

one end of the material grabbing pin is arranged on the lower fixing plate, the other end of the material grabbing pin penetrates through a lower ejection plate, an upper ejection plate, a male template and a male mold insert of the mold and abuts against the lower end of the lap joint type sprue, countersunk heads are arranged at positions of the material grabbing pin corresponding to the upper ejection plate, clearance holes are formed in the upper ejection plate and the lower ejection plate, and the countersunk heads are arranged in the clearance holes and have clearance distances with the lower end surfaces of the clearance holes;

after the upper cover of the keyboard is formed, in the ejection process, the upper ejection plate and the lower ejection plate drive the ejector pins to eject, the upper cover of the formed keyboard is ejected upwards, the material grabbing pins are ejected in a delayed mode, the lap-joint type sprue is static and does not move, and the lap-joint type sprue is separated from the upper cover of the keyboard under the action of the tensile force of the false sprue of the lap-joint type sprue; after the lap-joint type sprue is separated from the upper cover of the keyboard, when the countersunk head of the grabbing pin contacts the lower end face of the clearance hole, the grabbing pin is ejected out together with the upper ejection plate, the lower ejection plate and the ejector pin, and the grabbing pin ejects the lap-joint type sprue out, so that the lap-joint type sprue is separated from the male mold insert in the male mold core to complete the demolding action.

2. The automatic gate breaking structure of claim 1, wherein the lower end of the overlapping gate is provided with a hook-shaped notch, and the end of the material grabbing pin abutting against the overlapping gate is correspondingly provided with a projection matched with the hook-shaped notch.