阅读说明：本技术 一种吸塑模具结构 (Plastic suction mould structure ) 是由 王龙胜 陈勇 胡文龙 吴会文 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种吸塑模具结构,包括后模板、设置于后模板上的后模仁,所述后模仁包括内镶件、中间避让件、外镶件、中心固定件、外避让件,所述中间避让件套设于中心固定件外,多个内镶件呈环形分布于中心固定件与中间避让件之间,所述内镶件的侧壁与中心固定件之间设有内侧弹簧,多个外镶件呈环形分布于中间避让件的外周,且相邻外镶件之间设有外避让件,所述后模板上还设有固定块和外侧弹簧,所述外侧弹簧推动外避让件与中间避让件相抵,所述内镶件的内侧形成有内倒扣部,所述外镶件和外避让件的外侧形成有外倒扣部,本发明通过设置内镶件和外镶件同时自动脱模的结构,使得INS膜片能够顺利生产制造。(The invention discloses a plastic suction mould structure, which comprises a rear template and a rear mould core arranged on the rear template, wherein the rear mould core comprises an inner insert, a middle avoiding piece, an outer insert, a center fixing piece and an outer avoiding piece, the middle avoiding piece is sleeved outside the center fixing piece, a plurality of inner inserts are annularly distributed between the center fixing piece and the middle avoiding piece, an inner side spring is arranged between the side wall of the inner insert and the center fixing piece, a plurality of outer inserts are annularly distributed at the periphery of the middle avoiding piece, an outer avoiding piece is arranged between the adjacent outer inserts, a fixing block and an outer side spring are also arranged on the rear template, the outer side spring pushes the outer avoiding piece to abut against the middle avoiding piece, an inner back-off part is formed on the inner side of the inner insert, and an outer back-off part is formed on the outer side of the outer insert and the outer avoiding piece, the invention adopts a structure that the inner insert and the outer insert are simultaneously and automatically demouldered, so that the INS membrane can be manufactured smoothly.)

1. The utility model provides a plastic suction mould structure, includes the back template, sets up back mould benevolence on the back template, its characterized in that: the rear mold core comprises an inner insert, a plurality of middle avoiding pieces, an outer insert, a center fixing piece and an outer avoiding piece, the middle avoiding piece is sleeved outside the center fixing piece, the inner inserts are annularly distributed between the center fixing piece and the middle avoiding piece, an inner spring is arranged between the side wall of the inner insert and the center fixing piece, the inner spring pushes the inner inserts to abut against the inner side of the middle avoiding piece, the outer inserts are annularly distributed on the periphery of the middle avoiding piece, the outer avoiding piece is arranged between the adjacent outer inserts, a fixing block and an outer spring are further arranged on the rear mold plate, one end of the outer spring abuts against the fixing block, the other end of the outer spring abuts against the outer wall of the outer avoiding piece and pushes the outer avoiding piece to abut against the outer side of the middle avoiding piece, and an inner back-buckling part is formed on the inner side of the inner insert, the outer sides of the outer insert and the outer avoiding piece are provided with outer back-off parts,

during demolding, the middle avoiding piece moves downwards, so that an avoiding space is formed between the inner insert and the outer insert, the inner spring resets to push the inner insert to move outwards, the outer spring resets to push the outer avoiding piece to contract inwards, and an inward contracting space is formed between every two adjacent outer inserts.

2. The plastic suction mold structure of claim 1, wherein: still including setting up in the wedging piece of the bottom of middle dodge piece, and be equipped with vertical spring between middle dodge piece and the central mounting to it offsets with the wedging piece to promote middle dodge piece, the bottom of middle dodge piece is equipped with down the inclined plane, be equipped with on the wedging piece with lower inclined plane complex go up the inclined plane, through the cooperation on last inclined plane and lower inclined plane, thereby support middle dodge piece.

3. The plastic suction mold structure of claim 2, wherein: the bottom end of the central fixing piece is fixedly arranged on the supporting plate through an installation cushion block, and the vertical spring is arranged between the installation cushion block and the middle avoiding piece.

4. The plastic suction mold structure of claim 3, wherein: the middle avoiding piece extends inwards to form a step part, one end of the vertical spring is abutted against the step part, and the other end of the vertical spring is abutted against the bottom of the mounting cushion block.

5. The plastic suction mold structure of claim 3, wherein: the supporting plate is provided with a mounting groove, and the wedging block is arranged in the mounting groove in a sliding manner.

6. The plastic suction mold structure of claim 1, wherein: the bottom end of the inner insert extends inwards to form a ring edge, a limiting sliding groove is formed in the ring edge, and a positioning pin extending into the limiting sliding groove is arranged on the central fixing piece.

7. The plastic suction mold structure of claim 1, wherein: the outer side of the upper end of the middle avoiding piece is provided with an arc chamfer surface, and the outer side of the lower end of the inner insert is provided with an arc chamfer surface.

8. The plastic suction mold structure of claim 1, wherein: the outside of dodging the piece outward extends and is formed with the guide block, be equipped with on the fixed block with guide block complex guide way.

9. The plastic suction mold structure of claim 1, wherein: the positioning holes are respectively formed in two ends of the outer insert, the outer sides of the positioning holes are arranged in an opening mode, and positioning columns stretching into the positioning holes are installed on the fixing blocks.

10. The plastic suction mold structure of claim 9, wherein: and the axes of the positioning columns in the positioning holes at the two ends of the outer insert are collinear.

Technical Field

The invention relates to the technical field of molds, in particular to a plastic suction mold structure.

Background

The INS process is mainly used for door plate decoration strips, center consoles, instrument panels and the like on vehicle interior decorations. The INS process, also known as IMF (In-mold film), is to form the shape of the outer surface of a product by high pressure adsorption of a film In a forming mold In advance, to place the film In an injection mold of the product after trimming, and then to perform injection molding together with molten plastic,

the conventional INS membrane has no inverted buckle form, and if the product has a partial appearance, and the edge of the conventional INS membrane is covered by other appearance products, the conventional INS membrane can meet the appearance requirement, but only covers the appearance defects of the edge.

When the product with the exposed product edge is aimed at, the product edge cannot be completely covered by the INS membrane without the reverse buckling mode, so that the product edge becomes an appearance defect, and under the condition that the product needs to have a light transmission requirement and needs to be touched, light leakage is generated at the edge position, so that the problem of great appearance defect exists. If the INS membrane is designed to be the inverted structure, the INS membrane cannot be smoothly demoulded due to the existence of the inverted structure when being formed in a mould, and therefore the INS membrane with the inverted structure cannot be produced.

Disclosure of Invention

Aiming at the defects of the prior art, the plastic suction mould structure is provided, the INS membrane can be designed into an edge reverse-buckling type edge covering structure, and an inner insert and an outer insert are arranged to automatically demould simultaneously, so that the INS membrane can be smoothly produced and manufactured.

In order to achieve the above object, the present invention provides the following technical solutions.

A plastic suction mould structure comprises a front mould and a rear mould, wherein the front mould comprises a front template and a front mould core arranged on the front template, the rear mould comprises a rear template and a rear mould core arranged on the rear template, the rear mould core comprises an inner insert, a middle avoiding piece, an outer insert, a center fixing piece and an outer avoiding piece, the middle avoiding piece is sleeved outside the center fixing piece, the inner inserts are distributed between the center fixing piece and the middle avoiding piece in an annular mode, an inner side spring is arranged between the side wall of the inner insert and the center fixing piece, the inner side spring pushes the inner inserts to abut against the inner side of the middle avoiding piece, the outer inserts are distributed on the periphery of the middle avoiding piece in an annular mode, the outer avoiding piece is arranged between adjacent outer inserts, and a fixing block and an outer side spring are further arranged on the rear template, one end of the outer side spring abuts against the fixed block, the other end of the outer side spring abuts against the outer wall of the outer avoiding piece and pushes the outer avoiding piece to abut against the outer side of the middle avoiding piece, an inner reversing part is formed on the inner side of the inner insert, outer reversing parts are formed on the outer sides of the outer insert and the outer avoiding piece, the middle avoiding piece moves downwards during demolding, an avoiding space is formed between the inner insert and the outer insert, the inner side spring resets at the moment to push the inner insert to move outwards, the outer side spring resets to push the outer avoiding piece to contract inwards, an inwards contracting space is formed between two adjacent outer insert pieces, and when a piece is taken, the outer insert moves towards the avoiding space through an acting force of the taking piece, so that the INS diaphragm is taken out smoothly.

The invention has the beneficial effects that: the mold structure of the invention comprises a rear mold core which is divided into an inner insert, a middle avoiding piece, an outer insert and a central fixing piece, wherein an INS diaphragm is formed through the rear mold core during molding, an outer ring back-off of the INS diaphragm is formed through an inner back-off part formed on the inner side of the inner insert, an inner ring back-off of the INS diaphragm is formed through an outer back-off part formed on the outer side of the outer insert and an outer avoiding piece, during demolding, the middle avoiding piece moves downwards so as to move out between the inner insert and the outer insert, an avoiding space is formed between the inner insert and the outer insert, at the moment, an inner spring pushes the inner insert to move to the avoiding space, an outer spring pushes the outer avoiding piece to move to the avoiding space and not to abut against two adjacent outer insert pieces, so that an inner shrinkage space is formed between two adjacent outer insert pieces, when the INS diaphragm is taken out, the taking action force of the INS diaphragm pushes the outer insert to move to the avoiding space, thereby make the outer mold insert separate with the inner circle back-off of INS diaphragm, realize loosing core, be convenient for directly take out the INS diaphragm, and the INS diaphragm can not take place to interfere with interior mold insert and outer insert, after getting the piece and accomplishing, move the middle piece of dodging upwards into dodging the space again, thereby promote the inside spring of interior insert compression and inwards move, the outside spring of the outside compression outside of dodging the piece outwards moves, and the outside piece of dodging promotes the outside mold insert and outwards moves, thereby make interior mold insert, outer mold insert and the outer piece of dodging reset, prepare for next plastic uptake action, the mold structure of this application, reasonable in design, can the shaping has the INS diaphragm of marginal back-off formula structure of borduring the drawing of patterns, the product can not take place to interfere, make the INS diaphragm can produce manufacturing smoothly.

The bottom end of the middle avoiding piece is provided with a lower inclined surface, the wedging block is arranged at the bottom end of the middle avoiding piece, and an upper inclined surface matched with the lower inclined surface is arranged on the wedging block, so that the middle avoiding piece is supported.

The bottom end of the central fixing piece is fixedly arranged on the supporting plate through a mounting cushion block, and the vertical spring is arranged between the mounting cushion block and the middle avoiding piece. Through the improvement, the central fixing piece can be fixedly installed.

As an improvement of the invention, the intermediate avoiding piece extends inwards to form a step part, one end of the vertical spring is abutted against the step part, and the other end of the vertical spring is abutted against the bottom of the mounting cushion block. Through the improvement, the vertical spring is convenient to mount.

As an improvement of the invention, the supporting plate is provided with an installation groove, and the wedging block is arranged in the installation groove in a sliding manner. Through the improvement, the wedge block can be conveniently positioned and guided to move.

As an improvement of the invention, the bottom end of the inner insert extends inwards to form a ring edge, a limiting sliding groove is arranged on the ring edge, and a positioning pin extending into the limiting sliding groove is arranged on the central fixing piece. Through the improvement, the situation that the inner side spring pushes the inner insert to move excessively can be avoided.

As an improvement of the invention, the outer side of the upper end of the middle avoiding piece is provided with an arc chamfer surface, the outer side of the lower end of the inner insert is provided with an arc chamfer surface, when the wedging block moves inwards again, the middle avoiding piece is pushed to compress the vertical spring to move upwards, the outer side of the middle avoiding piece abuts against the inner side of the outer avoiding piece, and the inner side of the middle avoiding piece abuts against the outer side of the inner insert, so that the outer avoiding piece is pushed to compress the outer spring to move outwards, and the inner insert is pushed to compress the inner spring to retract inwards. Through the improvement, the middle avoiding piece is convenient to push the inner insert and the outer avoiding piece to move and reset.

As an improvement of the invention, a guide block is formed on the outer side of the outer avoiding piece in an extending mode, and a guide groove matched with the guide block is formed in the fixed block.

As an improvement of the invention, the outer side of the fixed block is provided with a circular arc surface matched with the outer insert.

As an improvement of the invention, the fixed block is also provided with a positioning column, the outer side wall of the outer insert is provided with a positioning hole matched with the positioning column, and the positioning column extends into the positioning hole.

As an improvement of the invention, the axes of the positioning columns in the positioning holes at the two ends of the outer insert are collinear.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the overall structure of the present invention with the front mold plate removed.

FIG. 3 is a schematic diagram of the present invention with the INS diaphragm removed from FIG. 2.

FIG. 4 is a schematic view of the structure of the center fixing member, the mounting pad, and the supporting plate of the present invention.

Fig. 5 is a schematic view of the rear core structure of the present invention.

Fig. 6 is a schematic view of the structure of the central avoiding member, the central fixing member and the mounting pad of the present invention.

Fig. 7 is a schematic view of the matching structure of the external insert and the external avoiding piece.

Fig. 8 is a schematic view of the fixed block structure of the present invention.

FIG. 9 is a schematic view of the construction of the inner insert of the present invention.

Figure 10 is a schematic view of the construction of the center fixing of the present invention.

Figure 11 is a schematic view of an intermediate bypass structure according to the present invention.

Figure 12 is a schematic view of the engagement of an intermediate bypass member with a wedge of the present invention.

Fig. 13 is a schematic view of the outer insert and the positioning post of the present invention.

FIG. 14 is a schematic diagram of the INS membrane structure of the present invention.

FIG. 15 is a fragmentary sectional view of an INS membrane of the present invention.

In the figure, 1, a rear template; 2. an inner insert; 2.1, a limiting sliding chute; 2.2, an inner inverted buckle part; 3. an intermediate avoidance member; 3.1, a step part; 4. an outer insert; 4.1, positioning holes; 4.2, an external back-off part; 5. a central fixing member; 6. an outer avoidance member; 6.1, a guide block; 7. an outer spring; 8. an inner spring; 9. a fixed block; 10. a wedging block; 11. a vertical spring; 12. a support plate; 12.1, mounting grooves; 13. positioning pins; 14. a positioning column; 15. installing a cushion block; 16. a front template; 17. an INS membrane; 17.1, reversely buckling the outer ring; 17.2, the inner ring is reversely buckled.

Detailed Description

The invention is further explained with reference to the drawings.

Referring to fig. 1 to 15, a plastic suction mold structure includes a front mold plate 16, a wedge 10, a rear mold plate 1, a rear mold insert disposed on the rear mold plate 1, and a support plate 12 disposed at a lower end of the rear mold plate 1.

The back mould benevolence includes interior mold insert 2, the middle piece 3 of dodging, outer inlay 4, dodge 6 outward, central mounting 5, be equipped with the through-hole on the back template 1, fixed being equipped with in the backup pad 12 stretches into the through-hole installation cushion 15, the bottom fixed mounting of center fixed block 9 is on installation cushion 15, be equipped with mounting groove 12.1 in the backup pad 12, wedging piece 10 slides and sets up in mounting groove 12.1, and through mounting groove 12.1, inject the removal route of wedging piece 10, make wedging piece 10 take out or immigration mounting groove 12.1.

Middle piece 3 of dodging is whole cyclic annularly, outside central mounting 5 was located to 3 covers of middle piece of dodging, 3 inside extensions of middle piece of dodging were formed with step portion 3.1, be formed with the spring hole on the step portion 3.1, install vertical spring 11 in the spring hole, vertical spring 11 one end offsets with the bottom of installing cushion 15, and the vertical spring 11 other end offsets with spring hole bottom, the bottom of middle piece 3 of dodging is equipped with down the inclined plane, the piece 10 sets up in the bottom of middle piece 3 of dodging, and is equipped with on the piece 10 of wedging and goes up the inclined plane with lower inclined plane complex to dodge a 3 to support in the middle, make vertical spring 11 be in compression state.

The inner insert 2 is provided with a plurality of inner inserts 2 which are annularly spliced and arranged and distributed between the central fixing part 5 and the middle avoiding part 3, an inner inverted buckle part 2.2 is formed at the upper end of the inner side of each inner insert 2, an inner side spring 8 is arranged between the side wall of each inner insert 2 and the central fixing part 5, an inner side mounting hole for mounting the inner side spring 8 is formed in the side wall of the central fixing part 5, one end of each inner side spring 8 is located in the inner side mounting hole and abuts against the bottom end of the corresponding inner side mounting hole, the other end of each inner side spring 8 abuts against the inner side of the corresponding inner insert 2, and the inner side springs 8 are in a compression state, so that the inner side springs 8 push the inner inserts 2 to abut against the inner side of the middle avoiding part 3.

The outer insert 4 and the outer avoiding piece 6 are multiple, the outer insert 4 and the outer avoiding piece 6 are annularly spliced, one outer avoiding piece 6 is arranged between two adjacent outer inserts 4, the outer inserts 4 are distributed on the periphery of the middle avoiding piece 3, an outer back-off portion 4.2 is formed at the lower end of the outer side of each outer insert 4 and the outer avoiding piece 6, a fixing block 9 and an outer spring 7 are further arranged on the rear template 1, an outer mounting hole is formed in the fixing block 9, one end of the outer spring 7 is located in the outer mounting hole and abuts against the bottom end of the outer mounting hole, the other end of the outer spring 7 abuts against the outer side of the outer avoiding piece 6, and the outer spring 7 is in a compression state, so that the outer spring 7 pushes the outer avoiding piece 6 to abut against the outer side of the middle avoiding piece 3. And the outer side of the fixed block 9 is provided with an arc surface matched with the outer avoiding piece 6 and the outer embedded piece 4. Thereby avoiding damage to the surface of the outer insert 4. The outside of dodging piece 6 outward extends and is formed with guide block 6.1, be equipped with on the fixed block with guide block 6.1 complex guide way, guide block 6.1 stretches into in the guide way, can inject the motion of guide block 6.1 through the guide way for dodge piece 6 can the steady movement outward.

The two ends of the outer insert 4 are respectively provided with a positioning hole 4.1, the outer side of each positioning hole 4.1 is provided with an opening, a positioning column 14 extending into each positioning hole 4.1 is mounted on each fixing block 9, namely the positioning column 14 in each positioning hole 4.1 at one end of the outer insert 4 is mounted on one fixing block 9, the positioning column 14 in each positioning hole 4.1 at the other end of the outer insert 4 is mounted on the other fixing block 9, and the axes of the two positioning columns 14 are collinear.

During molding, the front template 16 is arranged above the rear mold core, and the INS membrane 17 is molded through the rear mold core, wherein an outer ring reverse buckle 17.1 of the INS membrane 17 is molded through an inner reverse buckle part 2.2 formed on the inner side of the inner insert 2, and an inner ring reverse buckle 17.2 of the INS membrane 17 is molded through an outer reverse buckle part 4.2 formed on the outer side of the outer insert 4 and the outer reverse buckle part 6.

When demoulding, the wedging block 10 is moved out of the sliding chute, the upper inclined surface of the wedging block 10 is gradually separated from the lower inclined surface of the middle avoiding piece 3, the vertical spring 11 begins to reset to push the middle avoiding piece 3 to move downwards, so that an avoiding space is formed between the inner insert 2 and the outer insert 4, the middle avoiding piece 3 is not abutted against the inner insert 2 and the outer insert 4 due to the downward movement of the middle avoiding piece 3, the inner side spring 8 resets at the moment, the inner insert 2 is pushed to move outwards towards the avoiding space, so that the inner inverted buckle part 2.2 on the inner insert 2 is separated from the outer ring inverted buckle 17.1 of the INS diaphragm 17, the outer side spring 7 resets to push the outer avoiding piece 6 to retract towards the avoiding space and not abutted against the two adjacent outer inserts 4, so that an inner retracting space is formed between the two adjacent outer inserts 4, when the INS diaphragm 17 is taken out, the taking-out acting force of the INS 17 can push the outer insert to move towards the avoiding space, therefore, the outer insert 4 is separated from the inner ring reverse buckle 17.2 of the INS diaphragm 17, core pulling is achieved, the INS diaphragm 17 can be taken out directly and conveniently, and the INS diaphragm 17 cannot interfere with the inner insert 2 and the outer insert 4.

Through setting up two reference columns 14, rotation to outer mold insert 4 is spacing, avoid outer mold insert 4 to rotate to the space department that contracts inwards, and reference column 14 can inject outer mold insert 4's direction of motion, make it only can radially move, consequently, get an effort and can promote outer insert and move to dodging the space, and set up to the collineation through the axis with two reference columns 14 at outer insert 4 both ends, can not block when making outer mold insert 4 radial movement, in addition, be the opening setting with the outside of locating hole 4.1, when making outer mold insert 4 to dodge the space and move, the lateral wall of locating hole 4.1 can not take place to interfere with reference column 14.

After the piece is taken, the wedging block 10 is pushed inwards into the sliding groove, the middle avoiding piece 3 compresses the vertical spring 11 and moves upwards into the avoiding space, the inner insert 2 is pushed to compress the inner side spring 8 to move inwards, the outer avoiding piece 6 is closer to the center because the moving stroke of the outer avoiding piece 6 is larger than that of the outer insert 4, the middle avoiding piece 3 is firstly contacted with the outer avoiding piece 6 and pushes the outer avoiding piece 6 to compress the outer side spring 7 to move outwards, and when the outer avoiding piece 6 moves outwards, the side wall of the outer avoiding piece 6 is contacted with the side wall of the outer insert 4, the outer insert 4 is driven to move outwards through friction force, so that the outer insert 4 is reset firstly, the inner insert 2 and the outer avoiding piece 6 are reset again, preparation is made for the next action, and the plastic sucking molding INS diaphragm 17 is continuously realized.

In addition, the outer side of the upper end of the middle avoiding piece 3 is provided with a circular arc chamfer surface, the outer side of the lower end of the inner insert 2 is provided with a circular arc chamfer surface, after a piece is taken, the wedging block 10 is pushed to move inwards again, the middle avoiding piece 3 is pushed to compress the vertical spring 11 to move upwards, in the moving process of the middle avoiding piece 3, the upper end of the middle avoiding piece 3 is matched with the bottom end of the inner insert 2 and the bottom ends of the outer insert 4 and the outer avoiding piece 6, wherein the circular arc chamfer surface on the outer side of the middle avoiding piece 3 is abutted against the inner sides of the outer insert 4 and the outer avoiding piece 6, the inner side of the middle avoiding piece 3 is abutted against the circular arc chamfer surface on the outer side of the inner insert 2 to avoid interference, so that the outer avoiding piece 6 is pushed to compress the outer side spring 7 to move outwards, the outer insert 4 is pushed to move outwards, the inner insert 2 is pushed to compress the inner side spring 8 to contract inwards, and the middle avoiding piece 3 is realized, The movement of the inner insert 2, the outer avoiding piece 6 and the outer insert 4 is reset.

The bottom end of each inner insert 2 extends inwards to form a ring edge, a limiting sliding groove 2.1 is arranged on the ring edge, the limiting sliding grooves 2.1 are arranged along the radial direction, and a positioning pin 13 extending into the limiting sliding grooves 2.1 is arranged on the central fixing piece 5. When the inner side spring 8 resets, when pushing the inner insert 2 to move outwards to the avoidance space, the positioning pin 13 is matched with the limiting sliding groove 2.1, the movement of the inner insert 2 can be guided, the movement of the inner insert 2 is prevented from deviating, and meanwhile, when the positioning pin 13 is abutted against the end part of the limiting sliding groove 2.1, the inner insert 2 can be limited, the inner insert 2 is prevented from moving excessively, after the part taking is completed, the middle avoidance part 3 needs to move upwards to enter the avoidance space, so if the inner insert 2 moves excessively to the avoidance space, the upward movement of the middle avoidance part 3 can be interfered, and the upward movement of the middle avoidance part 3 is influenced.

The mold structure of the invention, through splitting the back mold core into an inner insert 2, a middle avoiding piece 3, an outer insert 4 and a central fixing piece 5, when molding, an INS diaphragm 17 is molded through the back mold core, wherein, an outer ring inverse buckle 17.1 of the INS diaphragm 17 is molded through an inner inverse buckle part 2.2 formed at the inner side of the inner insert 2, an inner ring inverse buckle 17.2 of the INS diaphragm 17 is molded through an outer inverse buckle part 4.2 formed at the outer side of the outer insert 4 and the outer avoiding piece 6, when demolding, the middle avoiding piece 3 moves downwards, thereby moving out between the inner insert 2 and the outer insert 4, forming an avoiding space between the inner insert 2 and the outer insert 4, at the moment, an inner side spring 8 pushes the inner insert 2 to move to the avoiding space, an outer side spring 7 pushes the outer avoiding piece 6 to move to the avoiding space, and not to be abutted against two adjacent outer inserts 4, thereby forming an inner contracting space between two adjacent outer inserts 4, when the INS diaphragm 17 is taken out, the piece taking acting force of the INS diaphragm 17 can push the outer insert to move towards the avoidance space, so that the outer insert 4 is separated from the inner ring reverse buckle 17.2 of the INS diaphragm 17, core pulling is realized, the INS diaphragm 17 is convenient to directly take out, the INS diaphragm 17 cannot interfere with the inner insert 2 and the outer insert 4, after the piece taking is finished, the middle avoidance piece 3 is moved upwards into the avoidance space, so that the inner insert 2 is pushed to compress the inner side spring 8 to move inwards, the outer avoidance piece 6 compresses the outer side spring 7 to move outwards, the outer insert 4 moves outwards, so that the inner insert 2, the outer insert 4 and the outer avoidance piece 6 are reset to prepare for the next plastic sucking action, the mold structure is reasonable in design, the inner insert 2 can move outwards by arranging a plurality of the outer inserts 4, the outer avoidance pieces 4 are arranged into a plurality of pieces, and the outer avoidance pieces 6 are arranged between two adjacent outer insert 4, the outer avoiding piece 6 retracts first to form an inner retracting space, so that the outer insert 4 can retract smoothly, interference cannot occur when the INS membrane 17 is demoulded, and the INS membrane 17 with the edge inverted buckle type edge covering structure can be produced and manufactured smoothly.

The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.