CN114523633A

CN114523633A - Secondary demoulding structure

Info

Publication number: CN114523633A
Application number: CN202210026455.5A
Authority: CN
Inventors: 王一栋; 应军杰; 俞方敏; 薛东波; 林晨锋; 黄伟; 黄志高; 周华民
Original assignee: Ningbo Fangzheng Tool Co Ltd
Current assignee: Ningbo Fangzheng Tool Co Ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2022-05-24

Abstract

The invention provides a secondary demoulding structure which comprises a sliding block seat, a first sliding block, a second sliding block and a driving cylinder, wherein one end of the first sliding block is in sliding fit with the sliding block seat and is connected with the driving cylinder, and the other end of the first sliding block is connected with one end of the second sliding block through a linkage assembly; a drawing block capable of vertically sliding is arranged on the second sliding block, a driving assembly is further arranged between the first sliding block and the second sliding block, and when the driving cylinder drives the first sliding block to slide towards the direction far away from the second sliding block in the first stage, the drawing block moves downwards to perform core-pulling and demolding with the vertical through hole of the product at one time; when first slider slip second stage, the linkage subassembly orders about the second slider along with first slider synchronous slip, realizes the horizontal rib secondary drawing of core drawing the patterns of product. The secondary demoulding structure disclosed by the invention can realize the secondary demoulding process of a product in two directions only by using one set of combined sliding block structure, and has the advantages of simple structure and convenience in demoulding.

Description

Secondary demoulding structure

Technical Field

The invention relates to the technical field of injection molds, in particular to a secondary demolding structure.

Background

An injection mold is a tool for producing plastic products, and is also a tool for giving the plastic products complete structures and precise dimensions. Injection molding is a processing method used for mass production of parts with complex shapes, and particularly relates to a method for injecting heated and melted plastic into a mold cavity from an injection molding machine at high pressure, and obtaining a formed product after cooling and solidification.

Fig. 1 shows a prior art injection molded product 100, which has a connecting plate perpendicular to the side wall of the product 100 on the side wall, two vertical through holes 101 on the connecting plate, and a plurality of transverse ribs 102 on the outer side wall of the product 100, and this structure has a great difficulty in demolding after injection molding. In the existing mold middle structure, two sets of slider structures are designed for a vertical through hole 101 and a transverse rib 102 to carry out a secondary core-pulling and demolding process, so that the mold is complex in structure, large in size and high in processing cost.

Disclosure of Invention

The problem solved by the invention is that in order to overcome the defects in the prior art, the secondary demoulding structure is provided, the secondary demoulding process in two directions of a product can be realized only by one set of combined sliding block structure, the structure is simple, and the demoulding is convenient.

In order to solve the problems, the invention provides a secondary demolding structure, which comprises a slider seat connected to a fixed mold plate, a first slider, a second slider and a driving cylinder, wherein the driving cylinder is connected to the slider seat, one end of the first slider is in sliding fit with the slider seat and is connected with a driving rod of the driving cylinder, the other end of the first slider is connected with one end of the second slider through a linkage component, the other end of the second slider extends to a mold cavity, and the lower end of the second slider is in sliding fit with an accommodating groove in the fixed mold plate; the second sliding block is provided with a drawing block capable of vertically sliding, a driving assembly is further arranged between the first sliding block and the second sliding block, when the driving cylinder drives the first sliding block to slide towards the direction far away from the second sliding block, the driving assembly drives the drawing block to move downwards, and when the first sliding block slides to a set position, the drawing block and a vertical through hole of a product are subjected to core-pulling and demoulding at one time; when the first sliding block continues to slide after sliding to the set position, the linkage assembly drives the second sliding block to synchronously slide along with the first sliding block, and secondary core-pulling and demolding of the second sliding block and the transverse ribs of the product are achieved.

Compared with the prior art, the injection mold has the following advantages:

in the secondary demoulding structure, the first core-pulling demoulding of a vertical through hole and the second core-pulling demoulding of a transverse rib on a product can be realized through one sliding block assembly, a second sliding block in the specific sliding block assembly is used for secondary demoulding of the transverse rib, a vertically sliding drawing block arranged on the second sliding block is used for primary core-pulling demoulding of the vertical through hole, the second sliding block is in linkage fit with the first sliding block, the sliding demoulding of the drawing block can be realized through the first-stage sliding of the first sliding block, and the second sliding block is kept still when the first sliding block slides in the first stage, so that the stable demoulding of the drawing block and the vertical through hole is ensured; after the core pulling of the block is finished, the first sliding block continues to perform second-stage demoulding sliding, and the second sliding block synchronously slides under the driving of the linkage assembly, so that the demoulding of the transverse ribs on the product and the second sliding block is realized; the whole process only needs one driving cylinder to drive the first sliding block to slide in two stages along the same direction, so that secondary demolding of the product at two different direction positions can be realized, and the whole secondary demolding structure is simple in structure and stable in driving.

Furthermore, the driving assembly comprises a driving block, one end of the driving block is connected with the first sliding block, the other end of the driving block is provided with a first guide inclined plane, and the lower end face of the drawing block is provided with a second guide inclined plane in sliding fit with the first guide inclined plane; when the first sliding block slides towards one end far away from the second sliding block, the drawing block slides downwards. In the structure, the block is pulled out to slide up and down under the driving action of the first guide inclined plane and the second guide inclined plane, so that the structure is simple and the operation is convenient.

As an improvement, a T-shaped limiting sliding groove is arranged on the first guiding inclined surface or the second guiding inclined surface, and correspondingly, a T-shaped limiting convex block matched with the T-shaped limiting sliding groove is arranged on the second guiding inclined surface or the first guiding inclined surface. In the above-mentioned improvement structure, the spacing spout of T type and the spacing lug of T type set up further increase the drive block and led the stability of effect to one side, guarantee to take out the piece and can not take place the skew on the horizontal direction when sliding from top to bottom, guarantee to take out the smooth drawing of core drawing of mould of piece.

Furthermore, the linkage assembly comprises a linkage rod, the second sliding block is provided with a linkage sliding groove, one end of the linkage rod is connected with the first sliding block, and the other end of the linkage rod is in sliding fit in the linkage sliding groove; and a first positioning lug is arranged at one end of the bottom of the linkage sliding groove close to the first sliding block, and a second positioning lug matched with the first positioning lug is arranged on the side wall of one end of the linkage rod away from the first sliding block. In the structure, the linkage of the first sliding block and the second sliding block can carry out limiting guide on the sliding of the first sliding block through the matching of the linkage rod and the linkage sliding groove, and when the linkage rod slides to the second positioning lug to abut against the first positioning lug, the second sliding block is linked with the first sliding block, namely, when the first sliding block continuously slides, the second sliding block synchronously slides along with the first sliding block.

Furthermore, the linkage assembly further comprises a positioning pull rod, the lower end of the second sliding block is provided with a positioning sliding groove, one end of the positioning pull rod is connected with the first sliding block, and the other end of the positioning pull rod is in sliding fit in the positioning sliding groove; the side wall of one end, far away from the first sliding block, of the positioning pull rod is provided with a first concave positioning groove, the side wall of one end, near the first sliding block, of the positioning sliding groove is provided with a locking block, and the locking block can slide along the direction perpendicular to the sliding direction of the first sliding block; the fixed die plate is also provided with a second positioning groove; when the lock is in the initial position, one end of the lock block is matched in the second positioning groove, and the other end of the lock block is abutted against the outer side wall of the positioning pull rod in a sliding manner; when the first sliding block slides to a set position in a direction away from the second sliding block, two ends of the locking block respectively correspond to the first positioning groove and the second positioning groove; when the first sliding block slides to a set position in a direction away from the second sliding block and then continues to slide, one end of the locking block is in sliding abutting contact with the inner wall of the accommodating groove, and the other end of the locking block is matched in the first positioning groove. In the structure, the linkage matching of the first sliding block and the second sliding block is more stable, the second sliding block is ensured to synchronously slide along with the first sliding block under the action of the linkage rod and the positioning pull rod, and smooth demolding of the drawing block and a product is ensured.

And the two ends of the locking block are respectively provided with a second oblique chamfer matched with the first oblique chamfer. In the above-mentioned improvement structure, the setting of first chamfer, the oblique chamfer structure of second makes the locking piece more nimble, convenient in the slip switching between first constant head tank, second constant head tank.

And the fixed die plate is further improved, pressing plates for vertically limiting the first sliding block and the second sliding block are arranged on two sides of the first sliding block and the second sliding block, a limiting block is connected to the lower end face of one end, close to the second sliding block, of each pressing plate, and the end, close to the positioning sliding groove, of each limiting block is concave inwards to form the second positioning groove. In the above-mentioned improved structure, among the above-mentioned improved structure, the setting of clamp plate has increased the stationarity when first slider, second slider slide to set up relevant stopper in this structure on the clamp plate, the terminal surface of stopper forms the second constant head tank, simple structure, convenient processing.

And the upper surface of one end of the slider seat, which is far away from the first slider, is provided with a stop block, and the lower surface of one end of the first slider, which is near to the second slider, is provided with a stop groove corresponding to the stop block, so that the limit position of the first slider, which slides along the demoulding direction, is limited. In the improved structure, the stop block and the stop groove structure are arranged for limiting the sliding formation of the first sliding block, and the resetting action after demoulding can be smoothly carried out.

In a further improvement, the upper surface of the other end of the sliding block seat is convexly provided with an arc-shaped positioning bulge, the lower end of the first sliding block is provided with an avoiding groove which is communicated with the stopping groove and extends towards the direction of the second sliding block, and the position of the lower end of the first sliding block, which is close to the avoiding groove, is also provided with a positioning groove; when the first sliding block slides towards the direction far away from the product, the positioning protrusion is in sliding fit in the avoiding groove, and when the first sliding block slides to the position that the first stopping block abuts against the first stopping groove, the positioning protrusion is in fit in the positioning groove. In the above-mentioned improvement structure, increased the further dual locking spacing of realization of location pull rod and positioning groove structure.

Drawings

Fig. 1 is a schematic structural view of an injection molded product in the prior art.

Fig. 2 is a schematic structural view of the initial state of the secondary demolding structure of the present invention.

Fig. 3 is another schematic angle view of the secondary demolding structure of the present invention.

Fig. 4 is an exploded view of the secondary ejection structure of fig. 2.

Fig. 5 is a structural schematic view of a primary demolding state of the secondary demolding structure of the invention.

Fig. 6 is another angle diagram of the structure of the secondary demolding structure in fig. 5 in a primary demolding state.

Fig. 7 is a structural schematic view of a secondary demolding state of the secondary demolding structure of the invention.

Fig. 8 is another angle diagram of the structure of the secondary demolding state of the secondary demolding structure in fig. 7.

Fig. 9 is an enlarged schematic diagram of X in fig. 6.

Fig. 10 is a sectional view of the first slider and the slider holder coupling structure of fig. 5.

Fig. 11 is a sectional view of the first slider and slider holder coupling structure of fig. 7.

Description of reference numerals: 100-product, 101-vertical through hole, 102-horizontal rib;

1-a slider seat, 2-a first slider, 2.1-a stop groove, 2.2-an escape groove, 2.3-a positioning groove, 3-a second slider, 3.1-a linkage chute, 3.2-a first positioning lug, 3.3-a positioning chute, 4-a driving cylinder, 5-a pumping block, 5.1-a second guiding inclined plane, 6-a driving block, 6.1-a first guiding inclined plane, 7-a T-shaped limit chute, 8-a T-shaped limit lug, 9-a linkage rod, 9.1-a second positioning lug, 10-a positioning pull rod, 10.1-a first positioning groove, 11-a locking block, 12-a second positioning groove, 13-a first inclined chamfer, 14-a second inclined chamfer, 15-a pressing plate, 16-a limit block, 17-a stop block, and 18-a positioning protrusion.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be noted that the terms "lower end", "bottom", "side wall", "inner wall", "end", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. In addition, in the description of the present invention, the terms "first" and "second" are used for convenience of description and distinction, and have no specific meaning.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 2, 3 and 4, the present invention provides a secondary demolding structure, which comprises a slider seat 1 connected to a fixed mold plate (not shown), a first slider 2, a second slider 3 and a driving cylinder 4, wherein the driving cylinder 4 is connected to the slider seat 1 and is used for driving the first slider 2 to horizontally slide. In addition, one end of the first sliding block 2 is in sliding fit with the sliding block seat 1 and is connected with the driving rod of the driving cylinder 4, specifically, the first sliding block 2 is provided with an assembling slot, and the outer end of the driving rod of the driving cylinder 4 is connected with an inserting block, so that the driving rod is in detachable inserting fit with the assembling slot through the inserting block. The other end of the first sliding block 2 is connected with one end of the second sliding block 3 through a linkage assembly, the other end of the second sliding block 3 extends to the die cavity, the lower end of the second sliding block 3 is in sliding fit in the accommodating groove in the fixed die plate, and two sides of the lower end of the second sliding block 3 are in sliding fit with the inner side wall of the accommodating groove; in addition, the second sliding block 3 is provided with a drawing block 5 capable of vertically sliding, the second sliding block 3 is provided with a containing groove communicated from left to right, and the drawing block 5 is matched in the containing groove and can slide in the vertical direction; a driving assembly is further arranged between the first sliding block 2 and the second sliding block 3, when a product is demoulded, when the driving cylinder 4 drives the first sliding block 2 to slide towards a direction far away from the second sliding block 3, the driving assembly drives the drawing block 5 to move downwards, so that a mandrel on the upper end surface of the drawing block 5 is slowly separated from the vertical through hole 101 in the product 100, and when the first sliding block 2 slides to a set position, the drawing block 5 and the vertical through hole 101 in the product 100 are subjected to once core-pulling and demoulding; when the first sliding block 2 continues to slide after sliding to the set position, the linkage assembly drives the second sliding block 3 to synchronously slide along with the first sliding block 2, so that secondary core-pulling and demolding of the second sliding block 3 and the transverse ribs 102 of the product 100 are realized, and complete demolding of the vertical through hole 101 of the whole product 100 and the transverse ribs on the side edge is realized.

In the above structure, as shown in fig. 4, the driving assembly includes a driving block 6, one end of the driving block 6 is connected to the first slider 2, the other end of the driving block 6 is provided with a first guiding inclined surface 6.1, and the lower end surface of the pulling block 5 is provided with a second guiding inclined surface 5.1 in sliding fit with the first guiding inclined surface 6.1; at the initial position, the lower end face of the drawing block 5 is matched with the upper end face of the driving block 6, namely the second guide inclined plane 5.1 is matched with the upper end of the first guide inclined plane 6.1, and at the moment, a mandrel at the upper end of the drawing block 5 is matched in the vertical through hole 101; when the first sliding block 2 slides towards one end far away from the second sliding block 3 left and right downwards in the driving cylinder 4, the drawing block 5 slowly slides downwards under the driving of the corresponding guide inclined plane, so that the core-pulling and demoulding of the drawing block 5 and the vertical through hole 101 of the product 100 are realized. More specifically, in order to further improve the stability of the guiding fit of the driving block 6 of the drawing block 5, a T-shaped limiting chute 7 parallel to the inclined plane is concavely arranged on the first guiding inclined plane 6.1, correspondingly, a T-shaped limiting lug 8 is convexly arranged on the lower end surface of the second guiding inclined plane 5.1, and the T-shaped limiting lug 8 is in sliding fit in the T-shaped limiting chute 7; in addition, the positions of the T-shaped limiting sliding groove 7 and the T-shaped limiting lug 8 in the structure can be interchanged, namely, the T-shaped limiting sliding groove 7 which is parallel to the inclined surface of the second guiding inclined surface 5.1 is arranged on the second guiding inclined surface in an inwards concave mode, and the T-shaped limiting lug 8 which is matched with the T-shaped limiting sliding groove 7 is arranged on the first guiding inclined surface 6.1 in an outwards convex mode.

The linkage assembly in the embodiment specifically comprises a linkage rod 9, a linkage sliding groove 3.1 is formed in the second sliding block 3, one end of the linkage rod 9 is connected with the first sliding block 2, and the other end of the linkage rod 9 is in sliding fit in the linkage sliding groove 3.1; in addition, a first positioning bump 3.2 is arranged at one end of the bottom of the linkage sliding chute 3.1 close to the first sliding block 2, and a second positioning bump 9.1 matched with the first positioning bump 3.2 is arranged on the side wall of the linkage rod 9 far away from one end of the first sliding block 2, as shown in fig. 4. After the arrangement, when the first slide block 2 slides towards the direction far away from the second slide block 3, the linkage rod 9 slides in the linkage sliding groove 3.1, namely, in the first stage, the first slide block 2 moves, the second slide block 3 does not move, and the first slide block 2 drives the driving block 6 to move while sliding, so that under the inclined reverse cooperation effect of the first guide inclined plane 6.1 and the second guide inclined plane 5.1, the drawing block 5 slowly moves downwards to realize the demoulding of the mandrel and the vertical through hole 101; after the first slide block 2 continues to move to the second positioning lug 9.1 on the linkage rod 9 and the first positioning lug 3.2 on the second slide block 3 to be abutted and matched, the second slide block 3 synchronously slides along with the first slide block 2, and linkage matching is realized so as to drive the second slide block 3 to be separated from the transverse ribs 102 on the product in a secondary demoulding manner. Specifically, the two linkage rods 9 in the structure are symmetrically arranged at the upper end positions of two sides of the sliding direction of the first sliding block 2, and the stability of synchronous sliding of the second sliding block 3 and the first sliding block 2 is guaranteed, so that the success rate of primary demoulding is guaranteed, and the qualified rate of finished products is improved.

In the above structure, in order to sufficiently ensure the stability of the linkage fit between the first slider 2 and the second slider 3, as shown in fig. 4, 5, 6, 8 and 9, the linkage assembly further comprises a positioning pull rod 10, the lower end of the second slider 3 is provided with a positioning chute 3.3, one end of the positioning pull rod 10 is connected to the lower end of the first slider 2, and the other end of the positioning pull rod 10 is in sliding fit in the positioning chute 3.3; the side wall of the positioning pull rod 10 far away from one end of the first sliding block 2 is provided with a first concave positioning groove 10.1, the side wall of the positioning sliding groove 3.3 near one end of the first sliding block 2 is provided with a locking block 11, and the locking block 11 can slide along the direction vertical to the sliding direction of the first sliding block 2; in addition, still be equipped with second constant head tank 12 on the fixed die plate, it is concrete, all be equipped with the clamp plate 15 that is used for vertical spacing first slider 2, second slider 3 in the both sides that lie in first slider 2, second slider 3 on the fixed die plate in this structure, be connected with stopper 16 at the lower terminal surface of the nearly second slider 3 one end of clamp plate 15 that corresponds, the tip indent that stopper 16 is close to location spout 3.3 forms second constant head tank 12.

In the above structure, when the injection molding is completed to the initial position, one end of the locking block 11 is fitted in the second positioning groove 12, and the other end is slidably abutted against the outer side wall of the positioning pull rod 10, as shown in fig. 3; when the first sliding block 2 slides to a set position in a direction away from the second sliding block 3, the set position is a position where the second sliding block 3 and the first sliding block 2 start to be in linkage fit, namely after the position, the second sliding block 3 slides along with the first sliding block 2 when the first sliding block 2 continues to move; and the two ends of the locking block 11 correspond to the first positioning groove 10.1 and the second positioning groove 12 respectively when in the set position, as shown in fig. 5 and 6; therefore, when the first slider 2 slides to a set position in a direction away from the second slider 3 and then continues to slide, as the second slider 3 also starts to slide along with the first slider 2, the side wall at the lower end of the second slider 3 starts to slide fit with the inner wall of the accommodating groove, in the sliding process of the first slider 2 and the second slider 3, the locking block 11 starts to slowly separate from the second positioning groove 12 and then slides towards the first positioning groove 10.1, until one end of the locking block 11 is completely fit in the first positioning groove 10.1, the other end of the locking block 11 slides against the inner wall of the accommodating groove, as shown in fig. 7 and 8, so that the first slider 2 is connected with the second slider 3 through the positioning pull rod 10, thereby ensuring that when the first slider 2 and the second slider 3 continue to slide to a linkage fit position, the linkage rod 9 at the upper end is not included between the first slider 2 and the second slider 3, meanwhile, the lower end of the second sliding block 3 is pulled by the positioning pull rod 10, so that the second sliding block can slide stably and accurately in synchronization with the first sliding block 2.

On the other hand, in order to enable the locking block 11 to be capable of better guiding and switching between the second positioning groove 12 and the first positioning groove 10.1 quickly after the first slider 2 and the second slider 3 are separated from each other and slide to the set position, in this embodiment, first oblique chamfers 13 are respectively disposed on two sides of the open ends of the first positioning groove 10.1 and the second positioning groove 12, and second oblique chamfers 14 matched with the first oblique chamfers 13 are respectively disposed at two ends of the locking block 11, as shown in fig. 10. After setting up like this, when first slider 2 slides to setting for the position after driving the second slider and slide together towards keeping away from second slider 3 direction, under the inclined plane guide effect of second chamfer 14 and first chamfer 13, the slip that the locking piece 3 can be more smooth guarantees that the high-speed joint of location pull rod 10 and second slider 3 can carry out the synchronous linkage then together.

On the other hand, as shown in fig. 2, 10 and 11, in order to limit the sliding distance of the first slider 2, a stop block 17 is provided on the upper surface of the end of the slider holder 1 far from the first slider 2, and a stop groove 2.1 corresponding to the stop block 17 is provided on the lower surface of the end of the first slider 2 near the second slider 3, for limiting the limit position of the first slider 2 sliding along the demolding direction. More specifically, in this embodiment, in addition to the abutting and stopping limit of the two corresponding stopping blocks 17, an arc-shaped positioning protrusion 18 is further convexly arranged on the upper surface of the other end of the slider seat 1, an avoiding groove 2.2 communicated with the stopping groove 2.1 and extending towards the second slider 3 is arranged at the lower end of the first slider 2, and a positioning groove 2.3 is further arranged at a position, close to the avoiding groove 2.2, of the lower end of the first slider 1; when the first sliding block 2 slides towards the direction far away from the product 100, the positioning protrusion 18 is in sliding fit in the avoiding groove 2.2, and when the first sliding block 2 continues to slide towards the direction far away from the second sliding block 3 until the first stop block 17 abuts against the first stop groove 2.1, the positioning protrusion 18 is in sliding fit in the positioning groove 2.3, so that double stop limiting is realized. Of course, in this embodiment, in consideration of the stability of the whole demolding structure, the corresponding stopping structures also comprise two groups and are symmetrically arranged on two sides of the sliding direction of the first sliding block 2.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims

1. The utility model provides a secondary demoulding structure, is including connecting slider seat (1) on the fixed die plate, its characterized in that: the sliding block mechanism is characterized by further comprising a first sliding block (2), a second sliding block (3) and a driving cylinder (4), wherein the driving cylinder (4) is connected to the sliding block seat (1), one end of the first sliding block (2) is in sliding fit with the sliding block seat (1) and is connected with a driving rod of the driving cylinder (4), the other end of the first sliding block (2) is connected with one end of the second sliding block (3) through a linkage assembly, the other end of the second sliding block (3) extends to a die cavity, and the lower end of the second sliding block (3) is in sliding fit with an accommodating groove in the fixed die plate; a drawing block (5) capable of vertically sliding is arranged on the second sliding block (3), a driving assembly is further arranged between the first sliding block (2) and the second sliding block (3), when the driving cylinder (4) drives the first sliding block (2) to slide towards the direction far away from the second sliding block (3), the driving assembly drives the drawing block (5) to move downwards, and when the first sliding block (2) slides to a set position, the drawing block (5) and a vertical through hole (101) of a product (100) are subjected to core pulling and demolding once; when the first sliding block (2) continues to slide after sliding to a set position, the linkage assembly drives the second sliding block (3) to synchronously slide along with the first sliding block, and secondary core-pulling and demolding of the second sliding block (3) and the transverse ribs (102) of the product (100) are realized.

2. The secondary ejection structure of claim 1, wherein: the driving assembly comprises a driving block (6), one end of the driving block (6) is connected with the first sliding block (2), the other end of the driving block (6) is provided with a first guide inclined plane (6.1), and the lower end face of the drawing block (5) is provided with a second guide inclined plane (5.1) in sliding fit with the first guide inclined plane (6.1); when the first sliding block (2) slides towards one end far away from the second sliding block (3), the drawing block (5) slides downwards.

3. The secondary ejection structure of claim 2, wherein: and a T-shaped limiting sliding groove (7) is arranged on the first guiding inclined plane (6.1) or the second guiding inclined plane (5.1), correspondingly, a T-shaped limiting convex block (8) matched with the T-shaped limiting sliding groove (7) is arranged on the second guiding inclined plane (5.1) or the first guiding inclined plane (6.1).

4. The secondary ejection structure of claim 1, wherein: the linkage assembly comprises a linkage rod (9), a linkage sliding groove (3.1) is formed in the second sliding block (3), one end of the linkage rod (9) is connected with the first sliding block (2), and the other end of the linkage rod (9) is in sliding fit in the linkage sliding groove (3.1); one end of the bottom of the linkage sliding groove (3.1) close to the first sliding block (2) is provided with a first positioning lug (3.2), and the side wall of the linkage rod (9) far away from one end of the first sliding block (2) is provided with a second positioning lug (9.1) matched with the first positioning lug (3.2).

5. The secondary ejection structure of claim 4, wherein: the linkage assembly further comprises a positioning pull rod (10), a positioning sliding groove (3.3) is formed in the lower end of the second sliding block (3), one end of the positioning pull rod (10) is connected with the first sliding block (2), and the other end of the positioning pull rod (10) is in sliding fit in the positioning sliding groove (3.3); a first concave positioning groove (10.1) is formed in the side wall of one end, far away from the first sliding block (2), of the positioning pull rod (10), a locking block (11) is arranged on the side wall of one end, close to the first sliding block (2), of the positioning sliding groove (3.3), and the locking block (11) can slide along the direction perpendicular to the sliding direction of the first sliding block (2); the fixed die plate is also provided with a second positioning groove (12); when the positioning pull rod is in an initial position, one end of the locking block (11) is matched in the second positioning groove (12), and the other end of the locking block is abutted to the outer side wall of the positioning pull rod (10) in a sliding mode; when the first sliding block (2) slides to a set position in a direction away from the second sliding block (3), two ends of the locking block (11) respectively correspond to the first positioning groove (10.1) and the second positioning groove (12); when the first sliding block (2) slides to a set position in a direction away from the second sliding block (3) and then continues to slide, one end of the locking block (11) is in sliding abutting contact with the inner wall of the accommodating groove, and the other end of the locking block is matched in the first positioning groove (10.1).

6. The secondary ejection structure of claim 5, wherein: the both sides of first constant head tank (10.1), second constant head tank (12) open end all are equipped with first chamfer (13) to one side, the both ends of locking piece (11) be equipped with respectively with first chamfer (13) matched with second chamfer (14) to one side.

7. The secondary ejection structure of claim 5, wherein: the two sides of the fixed die plate, which are positioned on the first sliding block (2) and the second sliding block (3), are respectively provided with a pressing plate (15) used for vertically limiting the first sliding block (2) and the second sliding block (3), the pressing plate (15) is close to the lower end face of one end of the second sliding block (3), and the end part of the limiting block (16), which is close to the positioning sliding groove, is recessed to form the second positioning groove (12).

8. The secondary ejection structure of claim 1, wherein: the upper surface of one end, far away from the first sliding block (2), of the sliding block seat (1) is provided with a stop block (17), the lower surface of one end, close to the second sliding block (3), of the first sliding block (2) is provided with a stop groove (2.1) corresponding to the stop block (17), and the stop groove is used for limiting the limit position of the first sliding block (2) in the sliding direction of demoulding.

9. The secondary ejection structure of claim 8, wherein: the upper surface of the other end of the sliding block seat (1) is also convexly provided with an arc-shaped positioning bulge (18), the lower end of the first sliding block (2) is provided with an avoiding groove (2.2) which is communicated with the stopping groove (2.1) and extends towards the direction of the second sliding block (3), and the position of the lower end of the first sliding block (2), which is close to the avoiding groove (2.2), is also provided with a positioning groove (2.3); when the first sliding block (2) slides towards the direction far away from the product (100), the positioning protrusion (18) is in sliding fit in the avoiding groove (2.2), and when the first sliding block (2) slides until the first stop block (17) abuts against the first stop groove (2.1), the positioning protrusion (18) is in fit in the positioning groove (2.3).