CN111469357A - Straight-ejection inner core-pulling mechanism of injection mold - Google Patents

Straight-ejection inner core-pulling mechanism of injection mold Download PDF

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Publication number
CN111469357A
CN111469357A CN202010389253.8A CN202010389253A CN111469357A CN 111469357 A CN111469357 A CN 111469357A CN 202010389253 A CN202010389253 A CN 202010389253A CN 111469357 A CN111469357 A CN 111469357A
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China
Prior art keywords
groove
block
spring
limiting
straight
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Granted
Application number
CN202010389253.8A
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Chinese (zh)
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CN111469357B (en
Inventor
汪明威
郑杰
王金标
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Zhejiag Taizhou Meiduo Mould Co ltd
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Zhejiag Taizhou Meiduo Mould Co ltd
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Priority to CN202010389253.8A priority Critical patent/CN111469357B/en
Publication of CN111469357A publication Critical patent/CN111469357A/en
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Publication of CN111469357B publication Critical patent/CN111469357B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/33Moulds having transversely, e.g. radially, movable mould parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/44Removing or ejecting moulded articles for undercut articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/33Moulds having transversely, e.g. radially, movable mould parts
    • B29C2045/338Mould parts with combined axial and transversal movements

Abstract

The invention relates to a direct-ejection inner core-pulling mechanism of an injection mold, which comprises a movable mold, wherein a direct ejector is arranged on the movable mold, the direct ejector comprises a direct ejector rod and a direct ejector block fixed on the top of the direct ejector rod, an elastic block groove with a downward notch is formed in the direct ejector rod, an elastic block is arranged in the elastic block groove, a spring groove is formed in the upper part of the elastic block, a first spring is arranged in the spring groove, the upper part of the elastic block is a matching part, four inclined guide sliding strips are arranged on the matching part, core-pulling blocks are arranged on the four guide sliding strips, a lug for forming a hole in a product is arranged at one end of each core-pulling block, and a guide sliding chute matched with the guide sliding strips is arranged at the other end of each core-pulling block. Compared with the prior art, the invention ensures that the lug on the core-pulling block is completely separated from the hole on the product, has simple structure and small occupied space, and ensures that the product can be successfully demoulded.

Description

Straight-ejection inner core-pulling mechanism of injection mold
Technical Field
The invention relates to a straight-top inner core-pulling mechanism of an injection mold, belonging to the technical field of injection molds.
Background
Generally, when holes or grooves exist in a plastic product, an injection mold needs to design a core-pulling mechanism to pull the mold out of the holes or the grooves, the core-pulling mechanism in the prior art generally designs inclined tops, but when two groups of holes are arranged in the product and are arranged oppositely, the core-pulling directions of the two inclined tops are opposite, so that interference is easy to occur, and core-pulling failure is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a straight-top inner core-pulling mechanism of an injection mold, which ensures that a product can be successfully demolded.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the direct-ejection inner core-pulling mechanism of the injection mold comprises a movable mold, wherein a direct ejector is arranged on the movable mold, the direct ejector comprises a direct ejector rod and a direct ejector block fixed at the top of the direct ejector rod, an elastic block groove with a downward notch is formed in the direct ejector block, an elastic block is arranged in the elastic block groove, a spring groove is formed in the upper portion of the elastic block, a first spring is arranged in the spring groove, two ends of the first spring are respectively fixed at the groove bottom of the spring groove and the groove bottom of the elastic block groove, the upper portion of the elastic block is a matching portion, four inclined slide guide strips are arranged on the matching portion, core-pulling blocks are arranged on the four slide guide strips, a convex block for forming a hole in a product is formed at one end of each core-pulling block, a slide guide chute matched with the slide guide strips is formed at the other end of each core-pulling block, a first limiting block is further fixed on the direct ejector block, and a step groove matched with the first limiting block is formed at, when the die is closed, the bottom of the elastic block is tightly attached to the movable die, the top of the elastic block is abutted to the bottom of the elastic block groove, the first spring is in a compressed state, the core-pulling block is located on the lower portion of the guide sliding strip, and the protruding block penetrates through the straight ejection block and enters the die cavity of the die.
As a further optimization of the above technical solution: a movable mold base plate, an ejector pin auxiliary plate and an ejector pin plate are sequentially arranged below the movable mold from bottom to top, a second limiting block is fixed on the movable mold base plate, a limiting groove is formed in the lower portion of the second limiting block, a limiting screw is arranged in the limiting groove, a first matching hole is formed in the ejector pin auxiliary plate, a spring cover is arranged in the first matching hole, a second matching hole is formed in the ejector pin plate, the diameter of the second matching hole is smaller than that of the first matching hole, the bottom of the straight ejector pin is located in the second matching hole, the rod portion of the limiting screw penetrates through the second limiting block and the spring cover and is fixed to the bottom of the straight ejector pin, a second spring is further sleeved on the rod portion of the limiting screw and is located in the spring cover, one end of the second spring is fixed to the top of the spring cover, and the other end of the second spring is fixed to the top of the second limiting, when the die is closed, the lower surface of the ejector plate is abutted to the spring cover, the cap head of the limiting screw is located at the notch of the limiting groove, and the second spring is in a compressed state.
As a further optimization of the above technical solution: one pair of side surfaces of the matching part are made into inclined surfaces, the other pair of side surfaces are provided with grooves, and the grooves are matched with the inclined surfaces to form four guide sliding strips.
As a further optimization of the above technical solution: one side of the first limiting block is provided with a limiting convex block, a limiting step is formed on the upper surface of the limiting convex block, a limiting groove wall matched with the limiting step is formed on the groove wall of the step groove, and the limiting groove wall is positioned above the limiting step during die assembly.
As a further optimization of the above technical solution: the included angle between the guide sliding strip and the vertical direction is 20 degrees.
As a further optimization of the above technical solution: the straight ejector rod is sleeved with a sliding sleeve, and the sliding sleeve is fixed on the movable die.
Compared with the prior art, the straight ejector rod is internally provided with the elastic block and the core-pulling block, and the core-pulling block performs inner core-pulling motion along the guide sliding strip inclined on the elastic block while the straight ejector rod is ejected out, so that the convex block on the core-pulling block is completely separated from the hole on the product, the structure is simple, and the occupied space is small; the ejection distance of the straight ejector rod is limited through the limiting screw, after the straight ejector rod stops moving, the ejector plate continues to drive the product to perform subsequent ejection, and the product ejection can be prevented from being stuck to the straight ejector for the secondary ejection in one-time ejection, so that the successful demolding of the product is ensured.
Drawings
Fig. 1 is a schematic cross-sectional structure of the present invention.
Fig. 2 is an enlarged schematic view of a structure at a in fig. 1.
FIG. 3 is a schematic perspective view of the matching of the spring block and the core-pulling block of the present invention.
Fig. 4 is a schematic top view of the structure of fig. 3.
Fig. 5 is a side view schematic of the structure of fig. 3.
Detailed Description
The invention is further described with reference to the following figures and detailed description. As shown in fig. 1-5, the direct ejection internal core pulling mechanism of the injection mold comprises a movable mold, wherein a direct ejection is arranged on the movable mold, the direct ejection comprises a direct ejection rod 1 and a direct ejection block 2 fixed on the top of the direct ejection rod 1, an ejection block groove 21 with a downward notch is formed in the direct ejection block 2, an ejection block 3 is arranged in the ejection block groove 21, a spring groove is formed in the upper part of the ejection block 3, a first spring 4 is arranged in the spring groove, two ends of the first spring 4 are respectively fixed on the groove bottom of the spring groove and the groove bottom of the ejection block groove 21, the upper part of the ejection block 3 is a matching part 31, one pair of side surfaces of the matching part 31 is made into an inclined surface 311, the other pair of side surfaces is made into a groove 312, the groove 312 is matched with the inclined surface 311 to form four guide sliding strips 313, each of the four guide sliding strips 313 is provided with a core pulling block 5, one end of the core pulling block 5 is provided with a, the other end of the core-pulling block 5 is provided with a slide-guiding chute 52 matched with the slide-guiding strip 313. The straight top block 2 is further fixed with a first limiting block 6, one side of the first limiting block 6 is provided with a limiting convex block 61, the upper surface of the limiting convex block 61 forms a limiting step 611, the bottom of the elastic block 3 is provided with a step groove 32, and the groove wall of the step groove 32 forms a limiting groove wall 321 matched with the limiting step 611. When the die is closed, the bottom of the elastic block 3 is tightly attached to the movable die, the top of the elastic block 3 is abutted to the bottom of the elastic block groove 21, the limiting groove wall 321 is located above the limiting step 611, the first spring 4 is in a compressed state, the core-pulling block 5 is located at the lower part of the sliding guide bar 313, and the bump 51 penetrates through the straight ejector block 2 and enters the die cavity of the die. The cooperation of limiting step 611 and limiting groove wall 321 plays a limiting role in the core pulling movement of the elastic block 3, and prevents the core pulling block 5 from separating from the guide sliding strip 313, resulting in the incapability of resetting. Fig. 1 is a transverse sectional view of the present invention along the axis of the bullet block 3, i.e., the direction B in fig. 4.
In the above technical scheme: and a movable mold base plate 12, an ejector auxiliary plate 11 and an ejector plate 10 are sequentially arranged below the movable mold from bottom to top, wherein the movable mold is arranged on the movable mold base plate 12 through mold feet. A second limit block 7 is fixed on the movable mold seat plate 12, a limit groove 71 is formed at the lower part of the second limit block 7, a limit screw 8 is arranged in the limit groove 71, a first matching hole is arranged in the thimble auxiliary plate 11, a spring cover 13 is arranged in the first matching hole, a second matching hole 101 is arranged in the ejector plate 10, the diameter of the second matching hole 101 is smaller than that of the first matching hole, the bottom of the straight ejector rod 1 is positioned in the second matching hole 101, the rod part of the limiting screw 8 penetrates through the second limiting block 7 and the spring cover 13 and is fixed at the bottom of the straight ejector rod 1, the rod part of the limit screw 8 is also sleeved with a second spring 9, the second spring 9 is positioned in the spring cover 13, one end of the second spring 9 is fixed on the top of the spring cover 13, and the other end of the second spring is fixed on the top of the second limiting block 7. When the mold is closed, the lower surface of the ejector plate 10 is abutted against the spring cover 13, the cap head of the limit screw 8 is positioned at the notch of the limit groove 71, and the second spring 9 is in a compressed state. The limit screw 8 and the limit groove 71 are matched to limit the ejection distance of the straight ejector rod 1, when the cap head of the limit screw 8 touches the groove bottom of the limit groove 71 in the ejection process, the straight ejector rod 1 stops moving, the ejector plate 10 and the ejector auxiliary plate 11 continue to drive a product to perform subsequent ejection, and the direct ejection can be prevented from being stuck after the product is ejected for the secondary ejection in one time, so that the demolding failure is caused.
In the above technical scheme: as shown in fig. 5, the angle between the slide guiding bar 313 and the vertical direction is 20 °.
In the above technical scheme: as shown in fig. 1, a sliding sleeve 14 is sleeved on the straight ejector rod 1, and the sliding sleeve 14 is fixed on the movable mold. The sliding sleeve 14 plays a role in guiding and sliding and guiding the straight ejector rod 1, so that the straight ejector rod 1 can be ejected and reset more smoothly.
After the injection molding is finished, the movable mold and the fixed mold are separated, the ejector plate 10 and the ejector auxiliary plate 11 start to perform ejection motion upwards, the ejector plate 10 does not extrude the spring cover 13 any more, the elastic force of the second spring 9 is gradually released and drives the spring cover 13, the limiting screw 8 and the straight ejector rod 1 to move upwards, and the straight ejector rod 1 stops moving until the cap head of the limiting screw 8 touches the bottom of the limiting groove 71;
in the above-mentioned motion process of straight ejector pin 1, straight ejector pin 2, first stopper 6 and loose core piece 5 are also driven synchronous upward movement, simultaneously because first spring 4 produces decurrent effort to bullet piece 3, make bullet piece 3 produce decurrent slip relatively to straight ejector pin 2, this in-process loose core piece 5 gradually along leading draw runner 313 carry out interior loose core motion, lug 51 breaks away from the product gradually, meet spacing step 611 until spacing cell wall 321, lug 51 breaks away from the product completely this moment, interior loose core finishes, bullet piece 3 is driven synchronous upward movement by spacing lug 61.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concept of the present invention should fall within the scope of the present invention.

Claims (6)

1. The direct-ejection internal core pulling mechanism of the injection mold comprises a movable mold and is characterized in that a direct ejection is arranged on the movable mold, the direct ejection comprises a direct ejection rod (1) and a direct ejection block (2) fixed to the top of the direct ejection rod (1), an elastic block groove (21) with a downward notch is formed in the direct ejection block (2), an elastic block (3) is arranged in the elastic block groove (21), a spring groove is formed in the upper portion of the elastic block (3), a first spring (4) is arranged in the spring groove, two ends of the first spring (4) are respectively fixed to the groove bottom of the spring groove and the groove bottom of the elastic block groove (21), a matching portion (31) is arranged on the upper portion of the elastic block (3), four inclined guide sliding strips (313) are arranged on the matching portion (31), core pulling blocks (5) are arranged on the four guide sliding strips (313), and a convex block (51) for forming holes in a product is formed at one end of each core pulling block (5), the other end system of core pulling block (5) with lead draw runner (313) complex and lead smooth chute (52), still be fixed with first stopper (6) on straight kicking block (2), the bottom system of bullet piece (3) with first stopper (6) complex step groove (32), during the compound die the bottom of bullet piece (3) with the movable mould is hugged closely, the top of bullet piece (3) with the tank bottom of bullet piece groove (21) is inconsistent, first spring (4) are in compression state, core pulling block (5) are located lead the lower part of draw runner (313), lug (51) pass in the die cavity of straight kicking block (2) entering mould.
2. The straight ejector core-pulling mechanism of the injection mold according to claim 1, characterized in that a movable mold base plate (12), an ejector pin subplate (11) and an ejector pin plate (10) are sequentially arranged below the movable mold from bottom to top, a second stopper (7) is fixed on the movable mold base plate (12), a stopper groove (71) is formed at the lower part of the second stopper (7), a stopper screw (8) is arranged in the stopper groove (71), a first mating hole is formed in the ejector pin subplate (11), a spring cover (13) is arranged in the first mating hole, a second mating hole (101) is formed in the ejector pin plate (10), the diameter of the second mating hole (101) is smaller than that of the first mating hole, the bottom of the straight ejector pin (1) is located in the second mating hole (101), the rod part of the stopper screw (8) passes through the second stopper (7) and the spring cover (13) and is fixed at the bottom of the straight ejector pin (1), the rod part of the limiting screw (8) is further sleeved with a second spring (9), the second spring (9) is located in the spring cover (13), one end of the second spring (9) is fixed to the top of the spring cover (13), the other end of the second spring is fixed to the top of the second limiting block (7), the lower surface of the ejector plate (10) is abutted to the spring cover (13) during die assembly, the cap head of the limiting screw (8) is located at the notch of the limiting groove (71), and the second spring (9) is in a compression state.
3. The straight-top internal core-pulling mechanism of an injection mold according to claim 1, wherein one pair of side surfaces of the engaging portion (31) is formed with an inclined surface (311), and the other pair of side surfaces is formed with a groove (312), and the grooves (312) are engaged with the inclined surface (311) to form four guide bars (313).
4. The straight-top inner core-pulling mechanism of the injection mold according to claim 1, characterized in that one side of the first limiting block (6) is provided with a limiting convex block (61), the upper surface of the limiting convex block (61) forms a limiting step (611), the groove wall of the stepped groove (32) forms a limiting groove wall (321) matched with the limiting step (611), and the limiting groove wall (321) is positioned above the limiting step (611) during mold closing.
5. The straight-top internal core-pulling mechanism of an injection mold according to claim 1, characterized in that the angle between the guide slider (313) and the vertical direction is 20 °.
6. The straight-top internal core-pulling mechanism of the injection mold according to claim 1, characterized in that a sliding sleeve (14) is sleeved on the straight ejector rod (1), and the sliding sleeve (14) is fixed on the movable mold.
CN202010389253.8A 2020-05-10 2020-05-10 Straight-ejection inner core-pulling mechanism of injection mold Active CN111469357B (en)

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CN111469357B CN111469357B (en) 2021-09-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114311550A (en) * 2022-01-06 2022-04-12 宁波方正汽车模具股份有限公司 Combined sliding block core-pulling mechanism

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203937124U (en) * 2014-07-15 2014-11-12 宁波跃飞模具有限公司 A kind of injection mold directly pushes up oblique picking device
CN204977169U (en) * 2015-09-21 2016-01-20 广东隆凯股份有限公司 Ejecting structure of mould secondary
CN109551721A (en) * 2018-11-05 2019-04-02 浙江工商职业技术学院 With the mold for receiving core-pulling mechanism in side slide diclinic top
CN212147378U (en) * 2020-05-10 2020-12-15 浙江台州美多模具有限公司 Straight-ejection inner core-pulling mechanism of injection mold

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203937124U (en) * 2014-07-15 2014-11-12 宁波跃飞模具有限公司 A kind of injection mold directly pushes up oblique picking device
CN204977169U (en) * 2015-09-21 2016-01-20 广东隆凯股份有限公司 Ejecting structure of mould secondary
CN109551721A (en) * 2018-11-05 2019-04-02 浙江工商职业技术学院 With the mold for receiving core-pulling mechanism in side slide diclinic top
CN212147378U (en) * 2020-05-10 2020-12-15 浙江台州美多模具有限公司 Straight-ejection inner core-pulling mechanism of injection mold

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114311550A (en) * 2022-01-06 2022-04-12 宁波方正汽车模具股份有限公司 Combined sliding block core-pulling mechanism

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Denomination of invention: Straight top inner core pulling mechanism of injection mould

Effective date of registration: 20220727

Granted publication date: 20210914

Pledgee: Industrial Commercial Bank of China Ltd. Taizhou Huangyan branch

Pledgor: ZHEJIAG TAIZHOU MEIDUO MOULD Co.,Ltd.

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