CN210679521U

CN210679521U - Secondary ejection mold

Info

Publication number: CN210679521U
Application number: CN201921490605.8U
Authority: CN
Inventors: 房亮; 曾兴隆
Original assignee: Wuxi Ruilang Technology Co Ltd
Current assignee: Wuxi Ruilang Technology Co Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-06-05
Anticipated expiration: 2029-09-09

Abstract

The utility model provides a secondary ejection die, it can prevent just ejecting mould together with product and stub bar when ejecting for the first time. The mold comprises an upper mold and a lower mold, wherein the lower mold comprises a bottom plate, mold feet and a lower mold core, a push rod is arranged in the middle of the bottom plate, the push rod is connected with a push pin back plate, a push pin plate is fixedly connected onto the push pin back plate, a product push pin and a flow channel push pin are arranged on the push pin plate, the product push pin is contacted with a product cavity, the flow channel push pin comprises a first flow channel push pin and a second flow channel push pin, the first flow channel push pin is connected onto the push pin plate, a limit groove is arranged above the first flow channel push pin and in the lower mold core, when the push pin plate is not ejected, a gap exists between the upper end of the first flow channel push pin and the lower end of the limit groove, a limit block and a limit spring are sequentially arranged in the limit groove from bottom to top, a second flow channel.

Description

Secondary ejection mold

Technical Field

The utility model relates to an injection mold technical field specifically is an ejecting mould of secondary.

Background

When a product in a common mold needs to be forcibly stripped and demoulded locally at present, if the mold is designed according to a traditional method, in order to ensure the smooth demould of the product, a structure containing two sets of ejector plate plates is adopted for secondary ejection, so that the product and a stub bar in a flow channel are ejected respectively, and the stub bar on the product is prevented from being cut off manually subsequently. A patent of application number 201621465280.4 introduces a secondary ejection mould suitable for thin wall product, it is including installing the thimble board on the thimble backplate, be equipped with the runner thimble on the thimble board, be used for ejecting the runner, still be equipped with the recess that the cross-section is the T shape on the thimble backplate, be equipped with T-shaped spare in the recess, there is the space between recess and the T-shaped spare, still be equipped with the product thimble on the T-shaped spare, when ejecting, the thimble board drives the runner thimble earlier and is ejecting with the runner, because there is the space between T-shaped spare and the recess, the thimble backplate removes the certain distance just can contact T-shaped spare and ejecting the product through the product thimble, adopt such structure because there is adhesion between product and the stub bar, probably at first time ejecting just directly take the product out of mould along with the stub bar.

SUMMERY OF THE UTILITY MODEL

To the problem, the utility model provides a secondary ejection die, it can prevent just ejecting mould together with product and stub bar when ejecting for the first time.

The technical scheme is as follows: the utility model provides a secondary ejection die, its includes mould and lower mould, the lower mould includes bottom plate, moulding foot and lower mould benevolence, be equipped with the ejector pin in the middle of the bottom plate, the ejector pin is connected with thimble backplate, fixedly connected with thimble board on the thimble backplate, be equipped with product thimble and runner thimble on the thimble board, product thimble and product die cavity contact, the runner thimble is just to the runner setting, its characterized in that: the runner thimble includes first runner thimble and second runner thimble, first runner thimble connect in on the thimble board, first runner thimble top is and is located be equipped with the spacing groove in the lower mould benevolence, when the thimble board is not ejecting, first runner thimble upper end with there is the clearance spacing groove lower extreme, spacing inslot is by down up being equipped with stopper and spacing spring in proper order, the stopper can block first runner thimble, spacing spring one end with the stopper contacts the other end with the contact of spacing groove top, the stopper upper end is equipped with the second runner thimble, runner downwardly extending forms big end down's round platform form back-off, the second runner thimble passes spacing spring with the back-off contact.

It is further characterized in that:

a pouring gate between the runner and the product cavity is a side pouring gate, and the aperture of the pouring gate gradually decreases towards the product cavity along the runner;

a gate between the runner and the product cavity is a submarine gate;

when the ejector plate is not ejected, the distance between the ejector plate and the lower die core is greater than or equal to the sum of the distance between the first runner ejector pin and the limiting groove and the thickness of the back-off and the runner;

and the ejector pin plate is provided with a limiting cushion block to prevent excessive ejection.

After the structure is adopted, during ejection, the injection molding machine drives the ejector plate to move upwards through the ejector rod, the product is ejected through the product ejector pin, and the stub bar is clamped on the lower die through the back-off due to the fact that the runner extends downwards, so that the stub bar is prevented from being taken out together during ejection; after the product is ejected, the first runner ejector pin upwards contacts the limiting block, the limiting block drives the second runner ejector pin to move upwards, the reverse buckle is ejected together with the stub bar in the runner, secondary ejection is achieved, then the ejector plate is reset under the driving of the ejector rod, the product ejector pin and the first runner ejector pin are reset, and the limiting block resets under the action of the limiting spring and simultaneously drives the second runner ejector pin to reset.

Drawings

FIG. 1 is a view of the structure of the present invention;

FIG. 2 is a top view of the flow channel;

FIG. 3 is a first ejection structure view;

FIG. 4 is a second ejection structure;

fig. 5 is an enlarged structural view of a portion a of fig. 1.

Detailed Description

The secondary ejection die shown in fig. 1-5 comprises an upper die 1 and a lower die 2, wherein the lower die 2 comprises a bottom plate 2-1, a die foot 2-2 and a lower die core 2-3, a top rod 2-4 is arranged in the middle of the bottom plate 2-1, the top rod 2-4 is connected with an injection molding machine, the top rod 2-4 is connected with a top needle back plate 3-1, a top needle plate 3-2 is fixedly connected on the top needle back plate 3-1, a product top needle 4-1 and a flow channel top needle are arranged on the top needle plate 3-2, the product top needle 4-1 is contacted with a product 5 cavity, the flow channel top needle is opposite to a flow channel 6, the flow channel top needle comprises a first flow channel top needle 4-2 and a second flow channel top needle 4-3, the first flow channel top needle 4-2 is connected on the top needle plate 3-2, a limit groove 7 is arranged, when the ejector plate 3-2 is not ejected, a gap exists between the upper end of the first flow channel ejector pin 4-2 and the lower end of the limiting groove 7, a limiting block 7-1 and a limiting spring 7-2 are sequentially arranged in the limiting groove 7 from bottom to top, the limiting block 7-1 can block the first flow channel ejector pin 4-2, one end of the limiting spring 7-2 is in contact with the limiting block 7-1, the other end of the limiting spring 7-2 is in contact with the top of the limiting groove 7, the second flow channel ejector pin 4-3 is arranged at the upper end of the limiting block 7-1, the flow channel 6 extends downwards to form a circular truncated cone-shaped back-off button 8 with a small upper part and a large lower part, and the second flow channel.

After the structure is adopted, during ejection, the injection molding machine drives the ejector pin plate 3-2 to move upwards through the ejector pin 2-4, the product 5 is ejected through the product ejector pin 4-1 as shown in fig. 3, and the stub bar is clamped on the lower die 2 through the back-off 8 due to the fact that the runner 6 extends downwards and the back-off 8 is arranged, so that the situation that the stub bar is taken out together when the product 5 is ejected is avoided; after the product 5 is ejected, as shown in fig. 4, the first runner ejector pin 4-2 contacts the limiting block 7-1 upwards, the limiting block 7-1 drives the second runner ejector pin 4-3 to move upwards, the plastic reverse buckle 8 has elasticity to eject the reverse buckle 8 and a stub bar in the runner 6 together, so that secondary ejection is realized, then the ejector pin plate 3-2 is reset under the driving of the ejector pin 2-4, the product ejector pin 4-1 and the first runner ejector pin 4-2 are reset, the limiting block 7-1 is reset under the action of the limiting spring 7-2 and drives the second runner ejector pin 4-3 to reset, and both secondary ejection and automatic reset can be realized.

The mold can adopt a submarine gate like a gate 9 suitable for a general secondary ejection mechanism, but if a side gate is adopted to gradually reduce the caliber of a cavity of a product 5 along a runner 6 as shown in fig. 2, although the gate mark is large, the mold can also be suitable for secondary ejection to realize automatic disconnection of a stub bar and the product, and simultaneously, compared with a traditional side gate, the mold can increase the injection flow rate.

In addition, when the ejector plate 3-2 is not ejected, the distance A between the ejector plate 3-2 and the lower mold core 2-3 is larger than or equal to the distance C between the first runner ejector pin 4-2 and the limiting groove 7 plus the thickness D of the back-off part 8 and the runner 5, so that the stub bars and products can be ejected completely. The ejector plate 3-2 can be further provided with a limiting cushion block 10 to prevent excessive ejection.

The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a secondary ejection die, its includes mould and lower mould, the lower mould includes bottom plate, moulding foot and lower mould benevolence, be equipped with the ejector pin in the middle of the bottom plate, the ejector pin is connected with thimble backplate, fixedly connected with thimble board on the thimble backplate, be equipped with product thimble and runner thimble on the thimble board, product thimble and product die cavity contact, the runner thimble is just to the runner setting, its characterized in that: the runner thimble includes first runner thimble and second runner thimble, first runner thimble connect in on the thimble board, first runner thimble top is and is located be equipped with the spacing groove in the lower mould benevolence, when the thimble board is not ejecting, first runner thimble upper end with there is the clearance spacing groove lower extreme, spacing inslot is by down up being equipped with stopper and spacing spring in proper order, the stopper can block first runner thimble, spacing spring one end with the stopper contacts the other end with the contact of spacing groove top, the stopper upper end is equipped with the second runner thimble, runner downwardly extending forms big end down's round platform form back-off, the second runner thimble passes spacing spring with the back-off contact.

2. The double ejection die of claim 1, wherein: and a pouring gate between the runner and the product cavity is a side pouring gate, and the aperture of the pouring gate gradually decreases towards the product cavity along the runner.

3. The double ejection die of claim 1, wherein: the gate between the runner and the product cavity is a submarine gate.

4. A double ejection die as claimed in claim 1, 2 or 3, wherein: when the ejector plate is not ejected, the distance between the ejector plate and the lower die core is larger than or equal to the sum of the distance between the first runner ejector pin and the limiting groove and the thickness of the back-off and the runner.

5. A double ejection die as claimed in claim 1, 2 or 3, wherein: and the ejector pin plate is provided with a limiting cushion block to prevent excessive ejection.