CN211390014U - Two-stage back-off combined core-pulling device for narrow space of injection mold - Google Patents

Abstract

The utility model provides a device of jointly loosing core of injection mold narrow space second grade back-off, detain inner core slider (1), B including A and detain slider (2), tray (3), spring (4), oblique slider (5) and A and detain exocoel slider (6). The utility model adopts the A buckle inner core slide block which is provided with a molded surface, a B buckle chute and a hook groove; the B buckle sliding block is provided with a B buckle core and a B buckle sliding rail; the A buckle outer cavity sliding block is provided with an upper round hole and a lower rectangular hole, and a hook pin is arranged in the lower rectangular hole; when the two-stage reverse buckle B core pulling device works, firstly, the inclined slide block drives the buckle A inner core slide block to move downwards, and the buckle B core is folded centripetally under the combined action of the spring, the support block and the buckle B slide groove and is pulled out from the core pulling structure of the two-stage reverse buckle B; and then, after the upper end of the hook groove moves downwards to touch the hook pin, the inclined slide block drives the A buckle outer cavity slide block to downwards cause the A buckle outer cavity slide block, the A buckle inner core slide block and the B buckle core to be separated from the A buckle of the second-level back buckle through the A buckle inner core slide block, so that the core pulling and demoulding of the second-level back buckle of the injection mould are realized, and the purposes of reducing the cost and improving the efficiency are achieved.

Description

Two-stage back-off combined core-pulling device for narrow space of injection mold

Technical Field

The utility model relates to an injection mold shedder of loosing core specifically indicates to be used for injection mold, and the drawing of core drawing is carried out to second grade back-off in narrow space to the narrow space second grade back-off of injection mold unites the device of loosing core.

Background

Description of the drawings: the back-off refers to a flange, a hook buckle, a convex rib or a tubular hole-shaped structure in the injection molding product, wherein the core-pulling demoulding direction is intersected with the opening and closing direction of the mold; the second-stage reverse buckle is one of the reverse buckles, and the second-stage reverse buckle is a B reverse buckle which is arranged in the A reverse buckle structure and has a core-pulling demoulding direction intersected with the core-pulling demoulding direction of the A reverse buckle; namely, the inverted buckle inner-folding inverted buckle is also called as a buckle inner buckle or a buckle folding buckle; the injection molding product provided with the secondary reverse buckle is hereinafter referred to as a product; referring to fig. 5, the secondary undercuts referred to herein are tube-like structures;

generally, a plurality of second-level back-off buttons in a product are different in shape, a space for core pulling and demolding of the second-level back-off buttons in a mold is narrow, and due to the fact that the structure of the second-level back-off buttons is complex, for core pulling and demolding of the second-level back-off buttons, an insert method is adopted in the prior art, namely, the second-level back-off structures and the corresponding products are separated, the second-level back-off buttons are formed through injection molding of a special injection mold, the second-level back-off buttons are used as inserts to be embedded into the mold of the injection molding products, and the products with the second-level back; because the insert method needs a plurality of moulds to carry out injection molding production, the number of moulds is large, the number of injection molding machines is large, the cost is high, and the production efficiency is low, therefore, the problems and the defects of high cost and low efficiency exist in the prior art.

Disclosure of Invention

In order to solve the problems and the defects of the prior art, the utility model adopts a device which is composed of an A buckle inner core slide block, a B buckle slide block, a supporting block, a spring, an inclined slide block and an A buckle outer cavity slide block, wherein the A buckle inner core slide block is a cylindrical steel component, the upper part of the A buckle inner core slide block is provided with a profile corresponding to the profile of a second-stage inverted buckle inner cavity, and the left side and the right side of the column wall of the A buckle inner core slide block are provided with buckling chutes which are inclined from top to bottom and from inside to outside and are called as B; a through groove with a rectangular cross section is arranged from the middle part to the lower part of the front side and the rear side of the column wall of the inner core slide block of the button A and is called as a hook groove; the B buckle sliding block is an L-shaped steel component, a rectangular flange is arranged at the upper part of the B buckle sliding block and is called as a B buckle core, and a buckle sliding rail corresponding to the B buckle sliding groove is arranged at the side wall of the B buckle sliding block and is called as a B buckle sliding rail; the support block is a rectangular steel component, and a circular through hole is arranged in the center of the support block and is called a core hole; the spring is a cylindrical spiral compression spring; the inclined sliding block is a steel component which is rectangular block-shaped when viewed from above, the center of the inclined sliding block is provided with an up-down direction cylindrical step-shaped through hole called a connecting hole, a buckling sliding groove which is inclined downwards from left to right is arranged below the inclined sliding block and called an inclined sliding groove, and a round blind hole which is used for placing the spring is also arranged above the inclined sliding block and called a spring hole; the A buckle outer cavity sliding block is a rectangular step-shaped steel component with a small upper part and a large lower part, a step through hole which is in the vertical direction and is large in the upper part and the lower part is arranged in the center of the interior of the A buckle outer cavity sliding block and is called a cavity hole, the small step hole in the upper part of the cavity hole is round and is called an upper round hole, and the large step hole in the lower part of the cavity hole is rectangular and is called a lower rectangular; cylindrical hook pins are convexly arranged on the front hole wall and the rear hole wall of the upper part of the lower rectangular hole;

the buckle A inner core sliding block, the buckle B sliding block, the supporting block, the spring and the inclined sliding block are all positioned in the cavity hole of the buckle A outer cavity sliding block, wherein the buckle A inner core sliding block and the buckle B core are positioned in the upper circular hole of the cavity hole, and the left buckle B core and the right buckle B core are correspondingly connected in the buckle B sliding grooves on the left side and the right side of the buckle A inner core sliding block in a sliding and buckling mode through the buckle B sliding rails; the inclined slide block slides in the lower rectangular hole of the cavity hole, the support block and the spring are positioned between the B buckle core and the inclined slide block, the spring is positioned below the support block, the lower part of the spring is positioned in the spring hole, and the support block is in sliding fit with the lower rectangular hole; the lower part of the A buckle inner core sliding block downwards slides to penetrate through the core hole of the support block and is fixedly connected with the inclined sliding block through the connecting hole; the hook pin is inserted in the middle of the hook groove in a sliding mode.

When the die works, the moving die and the fixed die are separated and the die is opened, firstly, the inclined slide block drives the A buckle inner core slide block to move downwards, and under the combined action of the spring, the jacking of the support block and the guide of the B buckle sliding groove, the B buckle cores positioned at the front side and the rear side of the A buckle inner core slide block are folded and moved towards the axial lead of the A buckle inner core slide block centripetally, so that the B buckle cores are pulled out from the B buckle structure of the second-stage reverse buckle; then, after the upper end of the hook groove descending along with the A buckle inner core slide block touches the hook pin, the inclined slide block drives the A buckle outer cavity slide block to synchronously perform downward inclined drawing movement through the A buckle inner core slide block, so that the A buckle outer cavity slide block, the A buckle inner core slide block and the B buckle core are separated from the A buckle of the secondary reverse buckle; and then, a product is pushed by a top plate ejector rod of the mold and the secondary back-off is separated from the movable mold core, so that the combined core-pulling device for the secondary back-off in the narrow space of the injection mold is provided, and the purposes of reducing the cost and improving the efficiency are achieved.

The purpose of the utility model is realized like this: the utility model provides a device of jointly loosing core of injection mold narrow space second grade back-off, detains slider, tray, spring, oblique slider and A knot exocoel slider including A, wherein: the buckle A inner core sliding block is a cylindrical steel component, the upper part of the buckle A inner core sliding block is provided with a molded surface corresponding to the molded surface of the secondary reverse buckle inner cavity, and buckling sliding grooves which are inclined from top to bottom and from inside to outside are symmetrically arranged on the left side and the right side of the column wall of the buckle A inner core sliding block by the upper axis and the lower axis of the buckle A inner core sliding block and are called buckle B sliding grooves; a through groove with a rectangular cross section is arranged from the middle part to the lower part of the front side and the rear side of the column wall of the inner core slide block of the button A and is called as a hook groove;

the B buckle sliding block is an L-shaped steel component, a rectangular flange is arranged at the upper part of the B buckle sliding block and is called as a B buckle core, and a buckle sliding rail corresponding to the B buckle sliding groove is arranged at the side wall of the B buckle sliding block and is called as a B buckle sliding rail;

the support block is a rectangular steel component, and a circular through hole which is called a core hole is formed in the center of the support block;

the spring is a cylindrical spiral compression spring;

the inclined sliding block is a steel component which is rectangular block-shaped in overlooking, the center of the inclined sliding block is provided with a through hole which is vertical and cylindrical step-shaped and is called a connecting hole, a buckling sliding groove which is inclined downwards from left to right is arranged below the inclined sliding block and is called an inclined sliding groove, and a round blind hole which is used for placing the spring is also arranged above the inclined sliding block and is called a spring hole;

the A buckle outer cavity sliding block is a rectangular stepped steel component with a small upper part and a large lower part, a stepped through hole with a large upper part and a small lower part is arranged in the center of the interior of the A buckle outer cavity sliding block and is called a cavity hole, the small stepped hole at the upper part of the cavity hole is round and is called an upper round hole, and the large stepped hole at the lower part of the cavity hole is rectangular and is called a lower rectangular hole; cylindrical hook pins are convexly arranged on the front hole wall and the rear hole wall of the upper part of the lower rectangular hole;

the buckle A inner core sliding block, the buckle B sliding block, the supporting block, the spring and the inclined sliding block are all positioned in the cavity hole of the buckle A outer cavity sliding block, wherein the buckle A inner core sliding block and the buckle B core are positioned in the upper circular hole of the cavity hole, and the left buckle B core and the right buckle B core are correspondingly connected in the buckle B sliding grooves on the left side and the right side of the buckle A inner core sliding block in a sliding and buckling mode through the buckle B sliding rails; the inclined slide block slides in the lower rectangular hole of the cavity hole, the support block and the spring are positioned between the B buckle core and the inclined slide block, the spring is positioned below the support block, the lower part of the spring is positioned in the spring hole, the support block is in sliding fit with the lower rectangular hole, and the lower part of the A buckle inner core slide block downwards slides to penetrate through the core hole of the support block and is fixedly connected with the inclined slide block through the connecting hole; the hook pin is inserted in the middle of the hook groove in a sliding mode.

Description of the drawings: the direction surface expressed by the structure is divided into an upper surface, a lower surface, a left surface, a right surface, a front surface and a rear surface, wherein the front surface is a surface facing the front view of the device, and the rear surface is a surface opposite to the front surface. The buckling sliding groove and the buckling sliding rail are a sliding groove and a sliding rail which are correspondingly connected in a sliding and buckling mode, for example, the corresponding groove rail with the T-shaped cross section or the corresponding groove rail with the V-shaped cross section.

Working principle and beneficial effects

When in application, the device is arranged in the movable mould core; the inclined slide block is guided by a slide block which is additionally provided with a corresponding inclined slide rail through the inclined slide groove to drive the inclined slide block to perform inclined drawing work;

when the die works, the moving die and the fixed die are separated and the die is opened, firstly, the inclined slide block drives the A buckle inner core slide block to move downwards, and under the combined action of the spring, the jacking of the support block and the guide of the B buckle sliding groove, the B buckle cores positioned at the front side and the rear side of the A buckle inner core slide block are folded and moved towards the axial lead of the A buckle inner core slide block centripetally, so that the B buckle cores are pulled out from the B buckle structure of the second-stage reverse buckle; then, after the upper end of the hook groove descending along with the A buckle inner core slide block touches the hook pin, the inclined slide block drives the A buckle outer cavity slide block to synchronously perform downward inclined drawing movement through the A buckle inner core slide block, so that the A buckle outer cavity slide block, the A buckle inner core slide block and the B buckle core are separated from the A buckle of the secondary reverse buckle; and then, pushing the product by a top plate ejector rod of the die and separating the product from the movable die core by secondary back-off.

The device has the advantages of simple structure, reliable work, small volume and small occupied internal space of the mould, is suitable for combined core-pulling and demoulding of the second-level back-off of a product at any oblique angle in the narrow internal space of the mould, avoids the defect of an insert method, ensures the core-pulling and demoulding of the second-level back-off of the injection mould, reduces the cost and improves the efficiency.

The utility model adopts a device composed of a buckle inner core slide block A, a buckle slide block B, a supporting block, a spring, an inclined slide block and a buckle outer cavity slide block A, wherein the buckle inner core slide block A is a cylindrical steel component, the upper part of the buckle inner core slide block A is provided with a molded surface corresponding to the molded surface of the second-stage back-off inner cavity, and the buckle inner core slide block A is provided with a buckle chute B and a hook groove; the B buckle sliding block is an L-shaped steel component and is provided with a B buckle core and a B buckle sliding rail; the support block is a rectangular steel component and is provided with a core hole; the spring is a cylindrical spiral compression spring; the inclined sliding block is a steel component which is rectangular block-shaped when viewed from above, and is provided with a connecting hole, an inclined sliding groove and a spring hole; the A buckle outer cavity sliding block is a rectangular step-shaped steel component with a small upper part and a large lower part, the A buckle outer cavity sliding block is provided with a cavity hole, the upper part of the cavity hole is an upper round hole, and the lower part of the cavity hole is a lower rectangular hole; a hook pin is arranged in the lower rectangular hole;

the buckle A inner core sliding block and the buckle B core are positioned in the upper round hole of the cavity hole, and the left buckle B core and the right buckle B core are correspondingly and slidably buckled and connected in the buckle B sliding grooves on the left side and the right side of the buckle A inner core sliding block through the buckle B sliding rails; the inclined slide block slides in the lower rectangular hole of the cavity hole, the support block and the spring are positioned between the B buckle core and the inclined slide block, the spring is positioned below the support block, the lower part of the spring is positioned in the spring hole, and the support block is in sliding fit with the lower rectangular hole; the lower part of the A buckle inner core sliding block downwards slides to penetrate through the core hole of the support block and is fixedly connected with the inclined sliding block through the connecting hole; the hook pin is inserted in the middle of the hook groove in a sliding mode.

When the die works, the moving die and the fixed die are separated and the die is opened, firstly, the inclined slide block drives the A buckle inner core slide block to move downwards, and under the combined action of the spring, the jacking of the support block and the guide of the B buckle sliding groove, the B buckle cores positioned at the front side and the rear side of the A buckle inner core slide block are folded and moved towards the axial lead of the A buckle inner core slide block centripetally, so that the B buckle cores are pulled out from the B buckle structure of the second-stage reverse buckle; then, after the upper end of the hook groove descending along with the A buckle inner core slide block touches the hook pin, the inclined slide block drives the A buckle outer cavity slide block to synchronously perform downward inclined drawing movement through the A buckle inner core slide block, so that the A buckle outer cavity slide block, the A buckle inner core slide block and the B buckle core are separated from the A buckle of the secondary reverse buckle; and then, the product is pushed by a top plate ejector rod of the mold and the secondary back-off is separated from the movable mold core, so that the problems and the defects of high cost and low efficiency in the prior art are overcome, and the provided combined core-pulling device for the secondary back-off in the narrow space of the injection mold enables the core-pulling and demolding of the secondary back-off of the injection mold, and the purposes of reducing the cost and improving the efficiency are achieved.

Drawings

Fig. 1 is a schematic view of a front view cross-sectional structure of a two-stage back-off combined core-pulling device in a narrow space of an injection mold of the present invention;

FIG. 2 is an exploded schematic view of the injection mold with two-stage reverse-buckling combined core-pulling device in a narrow space;

fig. 3 is a schematic diagram of the two-stage back-off combined core pulling device for the injection mold in the narrow space, which works in a core pulling and releasing state in a B-button 022 structure of the two-stage back-off 02;

FIG. 4 is a schematic diagram of the two-stage reverse-buckling combined core-pulling device for injection mold in narrow space, working in the state of core-pulling and releasing from the A-buckle 021 structure of the two-stage reverse-buckling 02;

fig. 5 is a schematic isometric view of an article 01 provided with a secondary undercut 02.

The invention will be described in more detail below with reference to an exemplary embodiment shown in the drawings, which should not be construed as limiting the invention in any way.

In the figure:

the die comprises an A buckle inner core slide block 1, a B buckle slide block 11, a hook groove 12, a B buckle slide block 2, a B buckle core 21, a B buckle slide rail 22, a support block 3, a core hole 31, a spring 4, an inclined slide block 5, an inclined slide groove 51, a connecting hole 52, a spring hole 53, an A buckle outer cavity slide block 6, a cavity hole 61, a hook pin 62, a product 01, a secondary reverse buckle 02, an A buckle 021, a B buckle 022, an A buckle core pulling direction 03, a B buckle core pulling direction 04 and an opening and closing direction 05 of the die.

Detailed Description

Referring to fig. 1-4, the utility model discloses a device of jointly loosing core is detained to injection mold narrow space second grade back-off, detain slider 2, tray 3, spring 4, oblique slider 5 and A and detain exocoel slider 6 including A detain inner core slider 1, B, wherein: the buckle A inner core sliding block 1 is a cylindrical steel component, a molded surface corresponding to the molded surface of the inner cavity of the secondary reverse buckle 02 is arranged at the upper part of the buckle A inner core sliding block 1, and buckling sliding grooves which are inclined from top to bottom and from inside to outside are symmetrically arranged on the left side and the right side of the column wall of the buckle A inner core sliding block 1 by the upper axis and the lower axis of the buckle A inner core sliding block 1 and are called as buckle B sliding grooves 11; a through groove with a rectangular cross section is arranged from the middle part to the lower part of the front side and the rear side of the column wall of the A buckle inner core slide block 1 and is called as a hook groove 12;

the B buckle sliding block 2 is an L-shaped steel component, a rectangular flange which is called a B buckle core 21 is arranged at the upper part of the B buckle sliding block 2, and a buckle sliding rail which corresponds to the B buckle sliding groove 11 is arranged at the side wall of the B buckle sliding block 2 and is called a B buckle sliding rail 22;

the support block 3 is a rectangular steel component, and a circular through hole which is called a core hole 31 is arranged in the center of the support block 3;

the spring 4 is a cylindrical spiral compression spring;

the inclined sliding block 5 is a steel component which is rectangular block-shaped in overlooking, the center of the inclined sliding block 5 is provided with a through hole which is in the vertical direction and is cylindrical step-shaped, the through hole is called a connecting hole 52, a buckling sliding groove which is inclined downwards from left to right is arranged below the inclined sliding block 5 and is called an inclined sliding groove 51, and a round blind hole which is used for accommodating the spring 4 is also arranged above the inclined sliding block 5 and is called a spring hole 53;

the A buckle outer cavity sliding block 6 is a rectangular stepped steel component with a small upper part and a large lower part, a stepped through hole with a small upper part and a large lower part is arranged in the center inside the A buckle outer cavity sliding block 6 and is called a cavity hole 61, a small stepped hole at the upper part of the cavity hole 61 is round and is called an upper round hole, and a large stepped hole at the lower part of the cavity hole 61 is rectangular and is called a lower rectangular hole; a cylindrical hook pin 62 is arranged at the front hole wall and the rear hole wall of the upper part of the lower rectangular hole in a protruding manner;

the A buckle inner core slide block 1, the B buckle slide block 2, the support block 3, the spring 4 and the inclined slide block 5 are all positioned in the cavity hole 61 of the A buckle outer cavity slide block 6, wherein the A buckle inner core slide block 1 and the B buckle core 21 are positioned in the upper round hole of the cavity hole 61, and the left and right buckle cores 21 are correspondingly connected in the B buckle slide grooves 11 on the left and right sides of the A buckle inner core slide block 1 in a sliding and buckling manner through the B buckle slide rail 22; the inclined slide block 5 slides in the lower rectangular hole of the cavity hole 61, the support block 3 and the spring 4 are positioned between the B buckle core 21 and the inclined slide block 5, the spring 4 is positioned below the support block 3, the lower part of the spring 4 is positioned in the spring hole 53, the support block 3 is in sliding fit with the lower rectangular hole, and the lower part of the A buckle inner core slide block 1 slides downwards to penetrate through the core hole 31 of the support block 3 and is fixedly connected with the inclined slide block 5 through the connecting hole 52; the hook pin 62 is slidably inserted into the middle of the hook groove 12.

Description of the drawings: the direction surface expressed by the structure is divided into an upper surface, a lower surface, a left surface, a right surface, a front surface and a rear surface, wherein the front surface is a surface facing the front view of the device, and the rear surface is a surface opposite to the front surface. The buckling sliding groove and the buckling sliding rail are a sliding groove and a sliding rail which are correspondingly connected in a sliding and buckling mode, for example, the corresponding groove rail with the T-shaped cross section or the corresponding groove rail with the V-shaped cross section.

Working principle and beneficial effects

When in application, the device is arranged in the movable mould core; the inclined slide block 5 is guided by a slide block additionally provided with a corresponding inclined slide rail through the inclined slide groove 51 to carry out inclined drawing work;

when the mold works, the movable mold and the fixed mold are separated and the mold is opened, firstly, the inclined slide block 5 drives the buckle A inner core slide block 1 to move downwards, and under the combined action of the spring 4, the jacking of the support block 3 and the guide of the buckle B slide groove 11, the buckle B cores 21 positioned at the front side and the rear side of the buckle A inner core slide block 1 are folded and moved towards the axial lead of the buckle A inner core slide block 1, so that the buckle B cores 21 are pulled out of the buckle B022 structure of the secondary back-off 02; then, after the upper end of the hook groove 12 descending along with the button A inner core slide block 1 touches the hook pin 62, the inclined slide block 5 drives the button A outer cavity slide block 6 to synchronously perform downward inclined drawing movement through the button A inner core slide block 1, so that the button A outer cavity slide block 6, the button A inner core slide block 1 and the button B21 are separated from the button A021 of the secondary reverse buckle 02; and then, ejecting the product 01 and the secondary back-off 02 to separate from the movable mold core by a top plate ejector rod of the mold.

The device has the advantages of simple structure, reliable work, small volume, small occupied internal space of the die, suitability for combined core-pulling and demolding of the secondary reverse buckle 02 of the product 01 in a narrow internal space of the die at any oblique angle, avoidance of the defect of an insert method, core-pulling and demolding of the secondary reverse buckle of the injection die, reduction of cost and improvement of efficiency.

Claims (1)

1. The utility model provides a device of jointly loosing core of injection mold narrow space second grade back-off, detains slider (2), tray (3), spring (4), slider (5) and A detain exocoel slider (6) including A detain inner core slider (1), B, its characterized in that: the buckle A inner core sliding block (1) is a cylindrical steel component, a molded surface corresponding to the inner cavity surface of the secondary reverse buckle (02) is arranged at the upper part of the buckle A inner core sliding block (1), and buckling sliding grooves which are inclined from top to bottom and from inside to outside are symmetrically arranged on the left side and the right side of the column wall of the buckle A inner core sliding block (1) by the upper axis and the lower axis of the buckle A inner core sliding block (1) and are called buckle B sliding grooves (11); a through groove with a rectangular cross section is arranged from the middle part to the lower part of the front side and the rear side of the column wall of the A buckle inner core slide block (1) and is called as a hook groove (12);

the B buckle sliding block (2) is an L-shaped steel component, a rectangular flange which is called a B buckle core (21) is arranged at the upper part of the B buckle sliding block (2), and a buckle sliding rail which corresponds to the B buckle sliding groove (11) and is called a B buckle sliding rail (22) is arranged at the side wall of the B buckle sliding block (2);

the support block (3) is a rectangular steel component, and a circular through hole called a core hole (31) is formed in the center of the support block (3);

the spring (4) is a cylindrical spiral compression spring;

the inclined sliding block (5) is a steel component which is rectangular block-shaped in overlooking, the center of the inclined sliding block (5) is provided with a through hole which is in the vertical direction and is cylindrical step-shaped, the through hole is called a connecting hole (52), a buckling sliding groove which is inclined downwards from left to right is arranged below the inclined sliding block (5) and is called an inclined sliding groove (51), and a round blind hole which is used for accommodating the spring (4) is also arranged above the inclined sliding block (5) and is called a spring hole (53);

the A buckle outer cavity sliding block (6) is a steel component in a rectangular step block shape with a small upper part and a large lower part, a step through hole which is in the vertical direction and is large upper part and small lower part is arranged in the center of the interior of the A buckle outer cavity sliding block (6) and is called a cavity hole (61), a small step hole in the upper part of the cavity hole (61) is a round hole and is called an upper round hole, and a large step hole in the lower part of the cavity hole (61) is a rectangular hole and is called a; a cylindrical hook pin (62) is arranged at the front hole wall and the rear hole wall of the upper part of the lower rectangular hole in a protruding manner;

the A buckle inner core sliding block (1), the B buckle sliding block (2), the support block (3), the spring (4) and the inclined sliding block (5) are all positioned in the cavity hole (61) of the A buckle outer cavity sliding block (6), wherein the A buckle inner core sliding block (1) and the B buckle core (21) are positioned in the upper round hole of the cavity hole (61), and the left and right buckle cores (21) are correspondingly connected in the B buckle sliding grooves (11) on the left and right sides of the A buckle inner core sliding block (1) in a sliding and buckling mode through the B buckle sliding rail (22); the inclined sliding block (5) slides in the lower rectangular hole of the cavity hole (61), the support block (3) and the spring (4) are positioned between the B buckle core (21) and the inclined sliding block (5), the spring (4) is positioned below the support block (3), the lower part of the spring (4) is positioned in the spring hole (53), the support block (3) is in sliding fit with the lower rectangular hole, the lower part of the A buckle inner core sliding block (1) downwards slides to penetrate through the core hole (31) of the support block (3) and is fixedly connected with the inclined sliding block (5) through the connecting hole (52); the hook pin (62) is inserted in the middle of the hook groove (12) in a sliding manner.

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