WO2022052804A1 - 浮动模仁抽芯结构 - Google Patents

浮动模仁抽芯结构 Download PDF

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Publication number
WO2022052804A1
WO2022052804A1 PCT/CN2021/114413 CN2021114413W WO2022052804A1 WO 2022052804 A1 WO2022052804 A1 WO 2022052804A1 CN 2021114413 W CN2021114413 W CN 2021114413W WO 2022052804 A1 WO2022052804 A1 WO 2022052804A1
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WO
WIPO (PCT)
Prior art keywords
movable
core
mold core
fixed
plate
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PCT/CN2021/114413
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English (en)
French (fr)
Inventor
李金国
虞伟炳
姚震
Original Assignee
台州职业技术学院
浙江赛豪实业有限公司
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Application filed by 台州职业技术学院, 浙江赛豪实业有限公司 filed Critical 台州职业技术学院
Publication of WO2022052804A1 publication Critical patent/WO2022052804A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2602—Mould construction elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/641—Clamping devices using means for straddling or interconnecting the mould halves, e.g. jaws, straps, latches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/66—Mould opening, closing or clamping devices mechanical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/66—Mould opening, closing or clamping devices mechanical
    • B29C2045/664—Mould opening, closing or clamping devices mechanical using mould clamping means operating independently from the mould closing means

Definitions

  • the invention belongs to the technical field of injection molds, and particularly relates to a core-pulling structure of a floating mold core.
  • An injection mold usually includes a movable mold core, a fixed mold core that closes the movable mold core to form a cavity, an ejector pin that slides through the movable mold core, and an ejector plate that can drive the ejector pin to slide to eject the molded product. Due to the shape or assembly requirements of the molded product, there are usually insert pins whose inner end matches the cavity surface in the movable mold core or the fixed mold core. or difficult to demold.
  • a Chinese patent document discloses a deep cavity core pulling mechanism, which includes a front template, a front mold core (namely a fixed mold core) arranged in the front template, a rear template, and a rear template arranged in the rear template.
  • the mold core that is, the movable mold core
  • the end of the front template away from the rear template is provided with a front mold panel, and the front mold core slides through an insert (ie, an insert) whose outer end is fixed on the front mold panel.
  • a thimble is slidably penetrated through the renzhong, the front mold panel and the front mold plate are connected by a limit screw, and a spring is sleeved on the limit screw.
  • the front mold panel first drives the inserts out of the cavity, the limit screws and springs can ensure the relative stability of the front mold panel’s outward movement, and then the movable mold core and the fixed mold core are separated, which is convenient for the ejector plate to push the ejector pin out shaped product.
  • the present invention provides a core-pulling structure for a floating die core.
  • the technical problem to be solved by the present invention is: how to simplify the core-pulling structure and improve the demolding rate at the same time.
  • a floating die core-pulling structure comprises a fixed die plate, a fixed die core fixed in the fixed die plate, a movable die plate, and a movable die core set in the movable die plate and fitted with the fixed die core to form a cavity when the die is closed and an insert needle whose one end passes through the movable mold core and extends to the cavity. It is slidably connected in the moving platen, and the moving platen is provided with a limiter that can limit the sliding stroke of the moving mold core. After the movable mold core is in contact with the limiting member, the fixed platen can continue to move to unlock the locking member and drive the fixed mold core to separate from the movable mold core.
  • the working principle of the present invention is as follows: the locking piece makes the fixed mold core mutually lock with the movable mold core when the mold is closed, so as to ensure the airtightness of the cavity during the injection molding process and ensure the injection molding effect; Under the action, it starts to move away from the moving platen. At the same time, the locking part keeps the moving and fixed mold cores in a locked state.
  • the fixed platen uses the locking part to drive the fixed and moving mold cores away from the moving platen together, that is, the moving mold core follows the fixed mold core.
  • the movable mold core is limited by the limiter and no longer continues to move with the fixed mold core, and the fixed template continues to drive the fixed mold core to move, unlocking the locking piece and separating the fixed mold core from the movable mold core, which is convenient for the molded product to come out.
  • the setting of the limiter can not only make the movable mold core move relative to the movable template, but also limit the sliding stroke of the movable mold core, which is convenient to control the separation distance between the movable mold core and the movable template, and ensure the cavity and the insert needle. While the ends are separated, the stable movement of the movable mold core can be ensured and can be separated from the fixed mold core.
  • the fixed template in this patent can drive the movable mold core to move, so that the insert needle is separated from the surface of the molded product, without the need to set the spring plate, that is, in the two-template structure (including the movable template and the fixed template) It realizes the separation of the molded product and the insert pin and the separation of the molded product from the movable mold core and the fixed mold core, which effectively simplifies the core-pulling structure of the mold.
  • the mold core is separated from the movable mold core, and the mold release process only needs to move the fixed platen, without moving the needle, which simplifies the mold release process and improves the mold release rate. Therefore, the present invention can improve the demolding rate while simplifying the core-pulling structure.
  • the limiting member includes a nut and a screw, the lower end of the screw is screwed into the movable die plate, the nut is located at the upper end of the screw, and the movable die There is a groove for inserting the limiter, the inner wall of the groove has a bearing surface which can be arranged opposite to the lower end surface of the nut, and there is a distance between the abutting surface and the lower end surface of the nut during mold clamping.
  • the limiter can be a limiter bolt or a limiter screw, etc. When the mold is closed, the lower end of the limiter is screwed and fixed with the movable die plate.
  • the nut of the limiter When the mold is closed, the nut of the limiter is located in the groove of the movable mold core. There is a distance between the inside and the abutting surface of the groove.
  • the fixed die plate drives the fixed die core and the movable die core to move upward together, that is, to move away from the movable die plate, the movable die core moves upward until the abutting surface and the lower end surface of the nut abut.
  • the movable mold core When connected, the movable mold core is limited and cannot continue to move outward.
  • the installation structure of the limiter is simple and reasonable, which is convenient for mold processing and preparation, and is conducive to simplifying the core-pulling structure of the mold. Stable movement to avoid the displacement of the movable mold core affecting the demoulding rate.
  • the screw rod includes a thread segment with an external thread and a connection segment connecting the thread segment and the nut, and the diameter of the connection segment is larger than the major diameter of the thread segment.
  • the threaded section is screwed into the movable platen, and the diameter of the connecting section is larger than the major diameter of the threaded section.
  • the step between the connecting section and the threaded section has a limiting effect, which can prevent the connecting section from moving down, and ensure that the contact surface and the The distance between the lower end faces of the nut remains unchanged, thereby ensuring that the moving distance of the movable mold core remains unchanged during demolding, ensuring the separation of the molded product and the insert, thereby ensuring the demolding rate.
  • the movable die plate is provided with an elastic reset member which makes the movable die core have a tendency to move away from the movable die plate.
  • the elastic reset piece is the power source for the ejection of the movable die core, and can assist in pushing the movable die core to move, ensuring the locking state of the locking piece, and ensuring that the movable die core and the fixed die core are in a locked state.
  • the locking and synchronous movement between the mold cores can speed up the moving speed of the moving mold cores and improve the demolding rate.
  • an installation groove for accommodating an elastic reset member is provided in the movable platen, the reset elastic member is a compression spring, and the lower end of the elastic reset member is connected to the bottom of the installation groove. Abutting, the upper end of the elastic reset piece abuts the movable mold core.
  • the installation structure of the elastic reset piece is simple and reasonable, which is convenient for mold processing and preparation, and is beneficial to simplify the core-pulling structure of the mold.
  • the number of elastic reset parts is at least two, and all elastic reset parts are arranged at uniform intervals in the circumferential direction, so as to ensure that the movable mold core is uniformly and stably moved when the mold is opened, and avoids the offset of the movable mold core and affects the release. mode rate.
  • the locking member has a latching protrusion
  • the movable die core is provided with a latching groove which is engaged with the latching protrusion when the mold is closed.
  • the locking part locks the movable mold core and the fixed mold core with each other by means of snap connection, and the locking protrusion of the locking part is inserted into the card slot, which can ensure the mutual locking of the movable mold core and the fixed mold core, and can also make the fixed template drive the fixed mold core to move upward. That is, move away from the movable mold core to unlock the locking piece.
  • the locking element and the corresponding slot structure on the movable mold core are nylon pull hooks or resin shutters, which have a simple structure and are conducive to low-cost production of the mold.
  • the movable platen is provided with an embedded groove, and a needle-inlaid plate is detachably embedded in the embedded groove, and the lower end of the inlaid needle is fixedly connected to the needle-inlaid plate.
  • the upper end of the insert needle passes through the movable template and the movable mold core in turn to reach the cavity. It not only ensures the installation stability of the insert pin in the movable die core, but also facilitates the installation and removal of the insert pin.
  • a thimble plate is provided below the movable platen, the lower end of the thimble is fixed on the thimble plate, the thimble plate is fixedly connected with the thimble, and the upper end of the thimble passes through in sequence
  • the over-moving template and the moving mold core reach the cavity. It is convenient for the ejector plate to drive the ejector pin to push out the molded product under the action of external force (such as hydraulic pressure and tensile force).
  • the present invention has the following advantages:
  • the fixed template can drive the movable mold core to move, so that the cavity and the insert needle are separated, without setting the spring plate, that is, the demoulding of the molded product is realized in the second template, which effectively simplifies The core-pulling structure of the mold.
  • the fixed platen can drive the movable mold core to be separated from the movable platen and the fixed mold core to be separated from the movable mold core in turn.
  • the demoulding process only the fixed platen needs to be moved, and the insert needle is not required to be moved, which simplifies the stripping process.
  • the mold process can improve the demolding rate.
  • FIG. 1 is a schematic cross-sectional structural diagram of the present embodiment in a clamping state.
  • FIG. 2 is an enlarged schematic view of the structure of the area A in FIG. 1 .
  • FIG. 3 is a schematic cross-sectional structural diagram of the present embodiment when the movable mold core is in contact with the limiting member during mold opening.
  • FIG. 4 is a schematic cross-sectional structural diagram of the ejector rod in the present embodiment when the molded product is ejected.
  • FIG. 5 is an enlarged schematic view of the structure of the B region in FIG. 1 .
  • the floating die core-pulling structure includes a fixed die plate 1, a fixed die core 2 fixed in the fixed die plate 1, a movable die plate 3 located below the fixed die plate 1,
  • the movable mold core 4 which is in the movable template 3 and is attached to the fixed mold core 2 to form the cavity 14 and the insert pin 6 whose one end passes through the movable mold core 4 and extends to the cavity 14 .
  • the movable template 3 is provided with The embedded groove 3b is detachably embedded in the embedded groove 3b with a needle insert plate 11, the lower end of the insert needle 6 is fixedly connected to the needle insert plate 11, and the upper end of the insert needle 6 passes through the movable template 3, the movable die core 4 and the Reaching the cavity 14 , not only the installation stability of the insert 6 in the movable mold core 4 can be ensured, but also the installation and disassembly of the insert 6 are facilitated.
  • the fixed mold core 2 is connected with a locking member 7 that locks the fixed mold core 2 and the movable mold core 4 to each other.
  • the locking member 7 makes the fixed mold core 2 and the movable mold core 4 lock each other when the mold is closed, so as to ensure the cavity 14 during the injection molding process. Airtight to ensure injection molding effect.
  • the movable die plate 3 is provided with an elastic reset member 8 which makes the movable die core 4 have a tendency to move away from the movable die plate 3 .
  • the movable mold core 4 is slidably connected in the movable template 3, and the movable template 3 is provided with a limiter 9 that can limit the sliding stroke of the movable mold core 4.
  • the setting of the limiter 9 enables the movable mold core 4 to It moves relative to the movable die plate 3, and at the same time can limit the stroke of the relative movement, which is convenient to control the separation distance between the movable die core 4 and the movable die plate 3, and can ensure the separation of the cavity 14 and the inner end of the insert pin 6 while ensuring the stability of the movable die core 4. move.
  • the fixed die plate 1 drives the fixed die core 2 and the movable die core 4 to move up and away from the movable die plate 3 until the movable die core 4 abuts against the limiting member 9, the fixed die plate 1 can continue to move upward to make the locking member 7 Unlock and drive the fixed mold core 2 away from the movable mold core 4.
  • the limiting member 9 includes a nut 91 and a screw 92 .
  • the screw 92 is arranged in the up-down direction.
  • the movable die core 4 is provided with a groove 4a for inserting the stopper 9, the screw rod 92 is slidably inserted in the groove 4a, and the inner wall of the groove 4a has an abutting surface 4a1 opposite to the lower end surface of the nut 91 , the abutment surface 4a1 can abut against the lower end surface of the nut 91 during the demolding process, and there is a distance of 15 between the abutment surface 4a1 and the lower end surface of the nut 91 during mold clamping.
  • the limiter 9 can be a limiter bolt or a limiter screw, etc.
  • the installation structure is simple and reasonable, which is convenient for mold processing and preparation, and is conducive to simplifying the core-pulling structure of the mold.
  • the guiding effect is beneficial to ensure the stable movement of the movable mold core 4 and avoid the deviation of the movable mold core 4 from affecting the demoulding rate.
  • the screw 92 includes a threaded section 921 with an external thread and a connecting section 922 connecting the threaded section 921 and the nut 91.
  • the diameter of the connecting section 922 is larger than the major diameter of the threaded section 921, so that the connecting section 922 and the connecting section 922 are located on the outer surface of the screw 92.
  • a step is formed between the thread segments 921. After the screw 92 is tightened, the step has a limiting effect.
  • the limiting member 9 can be prevented from moving down, and the distance 15 between the abutting surface 4a1 and the lower end surface of the nut 91 can be ensured. Therefore, it is ensured that the moving distance of the movable mold core 4 during the demolding process is unchanged, and the separation of the cavity 14 from the insert pin 6 is ensured, thereby ensuring the demolding rate.
  • the movable template 3 is provided with an installation groove 3a for accommodating the elastic reset member 8, the reset elastic member 8 is a compression spring, the elastic reset member 8 is arranged in the up and down direction, and the lower end of the elastic reset member 8 is abutted against the bottom of the installation groove 3a. , the upper end of the elastic reset member 8 is abutted against the movable mold core 4 .
  • the installation structure of the elastic reset member 8 is simple and reasonable, which is convenient for mold processing and preparation, and is beneficial to simplify the core-pulling structure of the mold.
  • the number of elastic reset parts 8 is at least two, and these elastic reset parts 8 are arranged at uniform intervals in the circumferential direction to ensure that the movable mold core 4 is uniformly and stably moved during the demoulding process, and avoids the movable mold core 4 from shifting. Affects demold rate.
  • the locking member 7 has a locking protrusion 7a, and the movable die core 4 is provided with a locking groove 4b which is engaged with the locking protrusion 7a.
  • the locking protrusion 7a is engaged in the card slot 4b, the locking member 7 locks the movable mold core 4 and the fixed mold core 3 with each other by clamping, and the locking protrusion 7a of the locking member 7 is inserted into the card groove 4b, which can ensure The movable die core 4 and the fixed die core 2 are locked with each other.
  • the fixed die plate 1 can be driven by the locking member 7 to move the fixed die core 2 upward.
  • the locking piece 7 When the limiter 9 is in contact with the movable die core 4 , with the upward movement of the fixed platen 2, the locking piece 7 can also be released from the card slot 4b and unlocked, so that the movable mold core 4 and the fixed film core 3 are separated.
  • the structure of the corresponding card slot 4b on the locking piece 7 and the movable mold core 4 can be nylon pull hooks or resin shutters.
  • the structure of the card slot 4b has a certain elasticity, so that the locking member 7 can be released from the card slot 4b when it is subjected to a sufficiently large external force.
  • the locking member 7 has a locking groove 4b, and the movable die core 4 is provided with a locking protrusion 7a engaged with the locking groove 4b.
  • a guide block 12 in the movable mold plate 3 is also a guide block 12 in the movable mold plate 3, and the guide block 12 is in contact with the side wall of the movable mold core 4, that is, the guide block 12 is in contact with the side wall of the movable mold core 4, and the guide block 12 can move on the movable mold core 4.
  • it plays a guiding role in the movement of the movable die core 4, which ensures that the movable die core 4 is subjected to uniform and stable movement during mold opening, and prevents the movable die core 4 from shifting and affecting the demolding rate.
  • the movable mold core 4 When the mold is closed, the movable mold core 4 is attached to the fixed mold core 2 to form a cavity 14, the upper end of the insert pin 6 extends into the cavity 14, and the locking piece 7 is inserted and engaged in the clamping groove 4b to make the movable mold core 4 and the fixed mold core 2 are locked with each other, and at the same time the lower end of the limiter 9 is screwed and fixed with the movable platen 3, and the nut 91 of the limiter 9 is located in the groove 4a of the movable mold core 4 and is against the abutting surface of the groove 4a.
  • 4a1 has a pitch of 15.
  • the mold opening process is as follows: as shown in Figure 3, after the injection molding is completed, the fixed mold plate 1 starts to move away from the movable mold plate 3 under the action of external force (such as hydraulic pressure, tensile force), that is, it moves upward, while the movable mold core 4 is in the locking part. 7 and the elastic reset piece 8 are driven away from the movable die plate 3 by the fixed die plate 1 together with the fixed die core 2, so that the cavity 14 and the insert pin 6 are separated (that is, the insert pin 6 is separated from the surface of the molded product 13), and the locking piece 7 It remains in a locked state with the card slot 4b.
  • external force such as hydraulic pressure, tensile force
  • the movable mold core 4 moves upward until the abutting surface 4a1 abuts against the lower end surface of the nut 91 , the movable mold core 4 is restricted by the nut 91 of the limiting member 9 and cannot continue to move.
  • the fixed die plate 1 continues to drive the fixed die core 2 to move upward, and the locking piece 7 is released from the card slot 4b to unlock the locking piece 7 while separating the fixed die core 2 and the movable die core 4, and then the ejector pin 5 moves upward. The movement ejects the molded product 13 .
  • the fixed template 1 in this embodiment can drive the movable mold core 4 to move, so that the insert pin 6 is separated from the surface of the molded product 13, without the need to set the spring plate, that is, the mold release of the molded product 13 is realized in the second template, which effectively simplifies the mold.
  • the fixed template 1 in this embodiment can sequentially drive the movable mold core 4 to be separated from the movable mold core 3, and the fixed mold core 2 to be separated from the movable mold core 4.
  • the demoulding process only the fixed template 1 needs to be moved, and the insert needle 6 does not need to be moved. , simplifies the demolding process and can improve the demolding rate.

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  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

本发明提供了一种浮动模仁抽芯结构，属于注塑模具技术领域。它解决了现有注塑模具抽芯结构复杂及脱模速率不佳等技术问题。本浮动模仁抽芯结构包括定模板、固连于定模板内的定模仁、动模板、设于动模板内且与定模仁贴合形成型腔的动模仁以及一端穿过动模仁并延伸至型腔的镶针，动模仁中滑动穿设有镶针，定模仁上设有使定模仁和动模仁相互锁定的锁定件，动模仁滑动连接在动模板内且动模板上设有能对动模仁的滑动行程进行限位的限位件，定模板带动定模仁和动模仁一起远离动模板至动模仁与限位件抵接后，定模板能继续移动使锁定件解锁并带动定模仁脱离动模仁。本发明在简化抽芯结构的同时提高脱模速率。

Description

浮动模仁抽芯结构 技术领域
本发明属于注塑模具技术领域，具体涉及一种浮动模仁抽芯结构。
背景技术
注塑模具通常包括动模仁、和动模仁闭合形成型腔的定模仁、滑动穿设于动模仁内的顶针以及能带动顶针滑动以顶出成型产品的顶针板。由于成型产品形状或装配需求，在动模仁或定模仁内通常还设有内端与型腔面相配合的镶针，成型产品在脱模时容易出现与镶针粘连的现象，导致产品变形或脱模困难。
为了解决这一问题，现有技术一般先将镶针与型腔分离，再使动模仁和定模仁分离的方法。如我国专利文献(授权公告号：CN210651711U)公开了一种深腔抽芯机构，包括前模板、设置于前模板内的前模仁(即定模仁)、后模板、设置于后模板内后模仁(即动模仁)，前模板远离后模板的一端设有前模面板，前模仁中滑动穿设有外端固连于前模面板上的镶件(即镶针)，后模仁中滑动穿设有顶针，前模面板和前模板通过限位螺钉连接，且限位螺钉上套设有弹簧。当产品脱模时，前模面板先带动镶件脱离型腔，限位螺钉和弹簧可保障前模面板外移的相对稳定性，然后动模仁和定模仁分离，便于顶针板推动顶针顶出成型产品。然而该技术方案与现有三模板(包含动模板、定模板和弹板)的结构类似，均需要设置弹板(如前模面板)带动镶针脱离型腔，导致模具抽芯结构复杂，脱模工序繁琐，不利于提高成型产品的脱模速率。
发明内容
本发明针对现有的技术存在的上述问题，提供一种浮动模仁抽芯结构，本发明所要解决的技术问题是：如何简化抽芯结构同时提高脱模速率。
本发明的目的可通过下列技术方案来实现：
一种浮动模仁抽芯结构，包括定模板、固连于定模板内的定模仁、动模板、设于动模板内且在合模时与定模仁贴合形成型腔的动模仁以及一端穿过动模仁并延伸至型腔的镶针，其特征在于，所述定模仁上设有在合模时使定模仁和动模仁相互锁定的锁定件，所述动模仁滑动连接在动模板内且动模板上设有能对动模仁的滑动行程进行限位的限位件，在脱模过程中，所述定模板带动定模仁和动模仁一起远离动模板至动模仁与限位件抵接后，所述定模板能继续移动使锁定件解锁并带动定模仁脱离动模仁。
本发明的工作原理为：锁定件使定模仁在合模时与动模仁相互锁定，保障注塑过程中型腔密闭，确保注塑效果；注塑完成后，定模板在外力(如液压力、拉力)作用下开始朝远离动模板的方向移动，同时锁定件使动模仁和定模仁保持锁定状态，定模板利用锁定件带动定模仁和动模仁一起远离动模板，即动模仁随定模仁一起被定模板带动远离动模板，使动模仁与镶针发生相对移动，从而使型腔和镶针分离(即镶针脱离成型产品表面)；当动模仁与限位件抵接后，动模仁被限位件限位不再继续随定模板一起移动，定模板继续带动定模仁移动，使锁定件解锁同时使定模仁和动模仁分离，便于成型产品脱出。限位件的设置，既能够使动模仁相对动模板相对运动，又能够限定动模仁的滑动行程，便于控制动模仁与动模板之间的分离间距，在确保型腔与镶针内端分离的同时保障动模仁稳定移动能够与定模仁分离。相比于现有技术中三模板结构，本专利中的定模板可带动动模仁移动，使镶针脱离成型产品表面，无需设置弹板，即在二模板结构(包含动模板和定模板)中实现了成型产品与镶针的分离以及成型产品从动模仁和 定模仁之间脱出，有效简化了模具的抽芯结构，同时本专利中的定模板可依次带动动模仁脱离动模板、定模仁脱离动模仁，脱模过程只需移动定模板，无需移动镶针，简化了脱模工序，可提高脱模速率。因此，本发明能够在简化抽芯结构的同时提高脱模速率。
在上述的浮动模仁抽芯结构中，所述限位件包括螺帽和螺杆，所述螺杆的下端螺接于动模板内，所述螺帽位于螺杆的上端，所述动模仁内设有供限位件插设的凹槽，所述凹槽内壁具有能够与螺帽下端面相对设置的抵靠面，在合模时所述抵靠面与螺帽下端面之间具有间距。限位件可以是限位螺栓或限位螺钉等，在合模状态时，限位件下端与动模板螺接固定，在合模状态时，限位件的螺帽位于动模仁的凹槽内且与凹槽的抵靠面之间具有间距，当定模板带动定模仁和动模仁一起向上即向远离动模板的方向移动，动模仁向上移动至抵靠面与螺帽下端面抵接时，动模仁被限位不能继续外移。限位件的安装结构简洁合理，便于模具加工制备，有利于简化模具的抽芯结构，同时限位件和凹槽可在动模仁移动过程中起到导向作用，有利于保障动模仁的稳定移动，避免动模仁出现偏移影响脱模速率。
在上述的浮动模仁抽芯结构中，所述螺杆包括具有外螺纹的螺纹段以及连接螺纹段和螺帽的连接段，所述连接段的直径大于螺纹段的大径。在合模状态时，螺纹段螺接于动模板内且连接段直径大于螺纹段大径，连接段与螺纹段之间的台阶具有限位作用，可防止连接段下移，确保抵靠面与螺帽下端面之间的间距不变，从而确保动模仁在脱模时移动的距离不变，保障成型产品与镶针分离，从而保障脱模速率。
在上述的浮动模仁抽芯结构中，所述动模板内设有使动模仁具有远离动模板趋势的弹性复位件。在定模板带动定模仁和动模仁一起移动的过程中，弹性复位件是动模仁弹出的动力来源，并 可协助推动动模仁移动，确保锁定件的锁定状态，保证动模仁与定模仁之间的锁定并同步移动，且可加快动模仁移动速率，提高脱模速率。
在上述的浮动模仁抽芯结构中，所述动模板内设有用于容置弹性复位件的安装槽，所述复位弹性件为压簧，所述弹性复位件的下端与安装槽的槽底抵顶，所述弹性复位件的上端与动模仁抵顶。弹性复位件的安装结构简洁合理，便于模具加工制备，有利于简化模具的抽芯结构。优选地，弹性复位件的数量至少为两个，且所有弹性复位件呈周向均匀间隔设置，保障动模仁在开模时受力均匀、稳定地移动，避免动模仁出现偏移影响脱模速率。
在上述的浮动模仁抽芯结构中，所述锁定件具有卡凸，所述动模仁上设有在合模时与卡凸卡合的卡槽。锁定件通过卡接的方式使动模仁和定模仁相互锁定，锁定件的卡凸插入卡槽内，可保障动模仁和定模仁相互锁紧，还可使定模板带动定模仁向上移动即向远离动模仁的方向移动使锁定件解锁。优选地，锁定件和动模仁上对应的卡槽结构为尼龙拉钩或树脂开闭器，结构简单，有利于模具的低成本制备。
在上述的浮动模仁抽芯结构中，所述动模板上设有嵌设槽，所述嵌设槽内可拆卸嵌设有镶针板，所述镶针的下端固连于镶针板上，所述镶针的上端依次穿过动模板和动模仁达到型腔内。不仅可确保镶针在动模仁内的安装稳定性，还便于镶针的安装和拆卸。
在上述的浮动模仁抽芯结构中，所述动模板下方设有顶针板，所述顶针的下端固连于顶针板上，所述顶针板上固连有顶针，所述顶针的上端依次穿过动模板和动模仁达到型腔内。便于顶针板在外力(如液压力、拉力)作用下带动顶针顶推出成型产品。
与现有技术相比，本发明具有以下优点：
1、通过锁定件和限位件的设置，使定模板可带动动模仁移动， 使型腔和镶针分离，无需设置弹板，即在二模板中实现了成型产品的脱模，有效简化了模具的抽芯结构。
2、通过锁定件和限位件的设置，使定模板可依次带动动模仁脱离动模板、定模仁脱离动模仁，脱模过程只需移动定模板，无需移动镶针，简化了脱模工序，可提高脱模速率。
附图说明
图1是本实施例在合模状态时的剖视结构示意图。
图2是图1中A区域的放大结构示意图。
图3是本实施例在开模中动模仁与限位件抵接时剖视结构示意图。
图4是本实施例中顶杆顶出成型产品时的剖视结构示意图。
图5是图1中B区域的放大结构示意图。
图中，1、定模板；2、定模仁；3、动模板；3a、安装槽；3b、嵌设槽；4、动模仁；4a、凹槽；4a1、抵靠面；4b、卡槽；5、顶针；6、镶针；7、锁定件；7a、卡凸；8、弹性复位件；9、限位件；91、螺帽；92、螺杆；921、螺纹段；922、连接段；10、顶针板；11、镶针板；12、导向块；13、成型产品；14、型腔；15、间距。
具体实施方式
以下是本发明的具体实施例并结合附图，对本发明的技术方案作进一步的描述，但本发明并不限于这些实施例。
如图1至图5所示，本实施例中，浮动模仁抽芯结构包括定模板1、固连于定模板1内的定模仁2、位于定模板1下方的动模板3、设于动模板3内且与定模仁2贴合形成型腔14的动模仁4以及一端穿过动模仁4并延伸至型腔14的镶针6。动模板3下方设有顶针板10，顶针5的下端固连于顶针板10上，顶针5上端 依次穿过动模板3、动模仁4并与型腔14相配合；动模板3上设有嵌设槽3b，嵌设槽3b内可拆卸嵌设有镶针板11，镶针6的下端固连于镶针板11上，镶针6上端依次穿过动模板3、动模仁4并到达型腔14内，不仅可确保镶针6在动模仁4内的安装稳定性，还便于镶针6的安装和拆卸。定模仁2上连接有使定模仁2和动模仁4相互锁定的锁定件7，锁定件7使定模仁2在合模时与动模仁4相互锁定，保障注塑过程中型腔14密闭，确保注塑效果。动模板3内设有使动模仁4具有远离动模板3趋势的弹性复位件8，弹性复位件8是动模仁4弹出的动力来源之一，可协助动模仁4脱离动模板3。动模仁4滑动连接在动模板3内且动模板3上设有能对动模仁4的滑动行程进行限位的限位件9，限位件9的设置，可使动模仁4能相对动模板3运动，同时可限定该相对运动的行程，便于控制动模仁4与动模板3的分离间距，可在确保型腔14与镶针6内端分离同时保障动模仁4的稳定移动。在脱模过程中，定模板1带动定模仁2和动模仁4一起向上远离动模板3至动模仁4与限位件9抵接后，定模板1能继续向上移动使锁定件7解锁并带动定模仁2脱离动模仁4。
如图2所示，限位件9包括螺帽91和螺杆92，螺杆92沿上下方向设置，螺杆92的上端与螺帽91一体连接，螺杆92的下端螺接于动模板3内。动模仁4内设有供限位件9插设的凹槽4a，螺杆92可滑动的插设在凹槽4a中，凹槽4a内壁具有与螺帽91下端面相对设置的抵靠面4a1，在脱模过程中抵靠面4a1能够与螺帽91的下端面相抵接，在合模时抵靠面4a1与螺帽91的下端面之间具有间距15。限位件9可以是限位螺栓或限位螺钉等，安装结构简洁合理，便于模具加工制备，有利于简化模具的抽芯结构，同时限位件9可在动模仁4移动过程中起到导向作用，有利于保障动模仁4的稳定移动，避免动模仁4出现偏移影响脱模速率。
螺杆92包括具有外螺纹的螺纹段921以及连接螺纹段921和螺帽91的连接段922，连接段922的直径大于螺纹段921的大径，从而在螺杆92的外侧面上位于连接段922与螺纹段921之间形成台阶，拧紧螺杆92后，台阶具有限位作用，在合模状态时，可防止限位件9下移，确保抵靠面4a1与螺帽91下端面之间的间距15不变，从而确保动模仁4在脱模过程中移动的距离不变，保障型腔14与镶针6分离，从而保障脱模速率。
动模板3内设有用于容置弹性复位件8的安装槽3a，复位弹性件8为压簧，弹性复位件8沿上下方向设置，弹性复位件8的下端与安装槽3a的槽底抵顶，弹性复位件8的上端与动模仁4抵顶。弹性复位件8的安装结构简洁合理，便于模具加工制备，有利于简化模具的抽芯结构。弹性复位件8的数量至少为两个，且这些弹性复位件8呈周向均匀间隔设置，保障动模仁4在脱模过程中受力均匀、稳定地移动，避免动模仁4出现偏移影响脱模速率。
锁定件7具有卡凸7a，动模仁4上设有与卡凸7a卡合的卡槽4b。合模时卡凸7a卡合在卡槽4b中，锁定件7通过卡接的方式使动模仁4和定模仁3相互锁定，锁定件7的卡凸7a插入卡槽4b内，可保障动模仁4和定模仁2相互锁紧，在脱模过程中，还能够使定模板1通过锁定件7带动定模仁2向上移动，当限位件9与动模仁4抵接后，随着定模板2的上移，还可以使锁定件7从卡槽4b内脱出而解锁，使动模仁4和定膜仁3分离。锁定件7和动模仁4上对应的卡槽4b结构可以是尼龙拉钩或树脂开闭器等，结构简单，有利于模具的低成本制备，还使锁定件7和动模仁4上对应的卡槽4b结构具有一定的弹性，使锁定件7在受到足够大的外力时能够从卡槽4b中脱出。或者锁定件7具有卡槽4b，动模仁4上设有与卡槽4b卡合的卡凸7a。
动模板3内还设有导向块12，导向块12与动模仁4侧壁抵 接，即导向块12与动模仁4侧壁相贴靠，导向块12可在动模仁4上移脱离动模板3的过程中对动模仁4的移动起到导向作用，保障动模仁4在开模时受力均匀、稳定地移动，避免动模仁4出现偏移影响脱模速率。
在合模状态时，动模仁4与定模仁2贴合并形成型腔14，镶针6的上端伸至型腔14中，锁定件7插入并卡合在卡槽4b中使动模仁4和定模仁2相互锁定，同时限位件9下端与动模板3螺接固定，限位件9的螺帽91位于动模仁4的凹槽4a内且与凹槽4a的抵靠面4a1具有间距15。
开模过程为：如图3所示，注塑完成后，定模板1在外力(如液压力、拉力)作用下开始朝远离动模板3的方向移动即向上移动，同时动模仁4在锁定件7和弹性复位件8的弹力作用下随定模仁2一起被定模板1带动远离动模板3，使型腔14和镶针6分离(即镶针6脱离成型产品13表面)，锁定件7与卡槽4b保持卡合锁定状态。然后，在动模仁4向上移动至抵靠面4a1与螺帽91下端面抵接时，动模仁4被限位件9的螺帽91限位不能继续移动。接着，如图4所示，定模板1继续带动定模仁2向上移动，锁定件7脱离卡槽4b使锁定件7解锁的同时使定模仁2和动模仁4分离，然后顶针5向上移动将成型产品13顶出。本实施例中的定模板1可带动动模仁4移动，使镶针6脱离成型产品13表面，无需设置弹板，即在二模板中实现了成型产品13的脱模，有效简化了模具的抽芯结构，同时本实施例中的定模板1可依次带动动模仁4脱离动模板3、定模仁2脱离动模仁4，脱模过程只需移动定模板1，无需移动镶针6，简化了脱模工序，可提高脱模速率。
本文中所描述的具体实施例仅仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。
尽管本文较多地使用了1、定模板；2、定模仁；3、动模板；3a、安装槽；4、动模仁；4a、凹槽；4a1、抵靠面；5、顶针；6、镶针；7、锁定件；8、弹性复位件；9、限位件；91、螺帽；92、螺杆；921、螺纹段；922、连接段；10、顶针板；11、镶针板；12、导向块；13成型产品等术语，但并不排除使用其它术语的可能性。使用这些术语仅仅是为了更方便地描述和解释本发明的本质；把它们解释成任何一种附加的限制都是与本发明精神相违背的。

Claims (8)

  1. 一种浮动模仁抽芯结构，包括定模板(1)、固连于定模板(1)内的定模仁(2)、动模板(3)、设于动模板(3)内且在合模时与定模仁(2)贴合形成型腔(14)的动模仁(4)以及一端穿过动模仁(4)并延伸至型腔(14)的镶针(6)，其特征在于，所述定模仁(2)上设有在合模时使定模仁(2)和动模仁(4)相互锁定的锁定件(7)，所述动模仁(4)滑动连接在动模板(3)内且动模板(3)上设有能对动模仁(4)的滑动行程进行限位的限位件(9)，在脱模过程中，所述定模板(1)带动定模仁(2)和动模仁(4)一起远离动模板(3)至动模仁(4)与限位件(9)抵接后，所述定模板(1)能继续移动使锁定件(7)解锁并带动定模仁(2)脱离动模仁(4)。
  2. 根据权利要求1所述的浮动模仁抽芯结构，其特征在于，所述限位件(9)包括螺帽(91)和螺杆(92)，所述螺杆(92)的下端螺接于动模板(3)内，所述螺帽(91)位于螺杆(92)的上端，所述动模仁(4)内设有供限位件(9)插设的凹槽(4a)，所述凹槽(4a)内壁具有能够与螺帽(91)下端面相对设置的抵靠面(4a1)，在合模时所述抵靠面(4a1)与螺帽(91)下端面之间具有间距(15)。
  3. 根据权利要求2所述的浮动模仁抽芯结构，其特征在于，所述螺杆(92)包括具有外螺纹的螺纹段(921)以及连接螺纹段(921)和螺帽(91)的连接段(922)，所述连接段(922)的直径大于螺纹段(921)的大径。
  4. 根据权利要求1所述的浮动模仁抽芯结构，其特征在于，所述动模板(3)内设有使动模仁(4)具有远离动模板(3)趋势的弹性复位件(8)。
  5. 根据权利要求4所述的浮动模仁抽芯结构，其特征在于，所述动模板(3)内设有用于容置弹性复位件(8)的安装槽(3a)，所述复位弹性件(8)为压簧，所述弹性复位件(8)的下端与安 装槽(3a)的槽底抵顶，所述弹性复位件(8)的上端与动模仁(4)抵顶。
  6. 根据权利要求1所述的浮动模仁抽芯结构，其特征在于，所述锁定件(7)具有卡凸(7a)，所述动模仁(4)上设有在合模时与卡凸(7a)卡合的卡槽(4b)。
  7. 根据权利要求1至6任意一项所述的浮动模仁抽芯结构，其特征在于，所述动模板(3)上设有嵌设槽(3b)，所述嵌设槽(3b)内可拆卸嵌设有镶针板(11)，所述镶针(6)的下端固连于镶针板(11)上，所述镶针(6)的上端依次穿过动模板(3)和动模仁(4)达到型腔(14)内。
  8. 根据权利要求7所述的浮动模仁抽芯结构，其特征在于，所述动模板(3)下方设有顶针板(10)，所述顶针板(10)上固连有顶针(5)，所述顶针(5)的上端依次穿过动模板(3)和动模仁(4)达到型腔(14)内。
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