Precision mold with pre-extraction protection mechanism

Abstract

The invention discloses a precision mold provided with a pre-extraction protection mechanism, which belongs to the field of thermoplastic plastic molding molds and is mainly used as a protection mechanism for precision molds with an insert surface embedded in a slide block during the molding process of plastic products. The invention utilizes the combined action of mold opening force, spring and push block to realize the simultaneous separation of the template of the fixed mold part, utilizes the linear motion of the pre-extraction plate to realize the movement of the floating block, utilizes the thrust of the floating block and the clamping block and the tension of the second spring to realize the pre-extraction movement of the insert, utilizes the limiting action of the shoulder bolt and the retraction action of the clamping block to realize the separation of the first fixed block and the floating block, utilizes the chamfering pushing action of the guide block to realize the resetting of the clamping block, and the pre-extraction protection mechanism realizes the pre-extraction movement of the insert and the post-retraction movement of the slide insert, thereby ensuring the mold opening sequence, preventing damage to the mold, saving mold cost, simplifying the mold structure, ensuring the smooth production process of plastic products, improving production efficiency and reducing the defective rate.

Description

Technical Field

[0001] The present invention belongs to the field of thermoplastic plastic molding dies, and relates to a precision mold with a pre-extraction protection mechanism, which is mainly used as a protection mechanism for precision molds with insert surfaces embedded in sliders during the molding process of plastic products, ensuring the mold opening sequence so that mold production proceeds smoothly and protecting the service life of the precision mold at the same time. Background Art

[0002] Plastic products have the advantages of light weight, good chemical stability and good electrical insulation performance. They are widely used in daily life and industrial production. In order to achieve various uses and assembly needs, plastic products are provided with deep ribs and undercuts. The molding and mass production of plastic products rely on injection molds. When the inserts of the fixed mold shape and the slider of the movable mold have an inserting part, the conventional mold structure cannot realize the mold structure of first pulling out the slider and then sliding the insert. Summary of the invention

[0003] The purpose of the present invention is to provide a precision mold with a pre-extraction protection mechanism, which realizes the separation of the template by relying on the joint action of the spring and the push block, and realizes the pre-extraction of the insert by relying on the force of the template separation, thereby ensuring the smooth production of plastic products.

[0004] The technical problem to be solved by the present invention is to provide a precision mold with a pre-extraction protection mechanism to solve the problems existing in the production process of plastic product molds with deep ribs and undercuts, ensure the shape of the plastic product, enable the plastic product to be smoothly demoulded and meet technical requirements and usage requirements.

[0005] The technical scheme of the present invention is: the structure of the precision mold provided with the first extraction protection mechanism includes: a hot runner plate 1, a first extraction plate 2, a fixed mold plate 3, a movable mold plate 4, a first pull rod 5, a push block 6, a first spring 7, a second pull rod 8, a fixed mold insert 9, a floating block 10, a stop bar 11, a first fixed block 12, a second fixed block 13, a clamping block 14, a ball head top screw 15, a guide block 16, a limit block 17, a counter insert 18, a shoulder bolt 19, a second spring 20, a slider insert 21, a slider seat 22, a screw 23 and a movable mold insert 24;The connection relationship is as follows: the hot runner plate 1 and the first extraction plate 2 are in surface contact and connected by guide pins and guide sleeves, the first extraction plate 2 and the fixed mold plate 3 are in surface contact and connected by guide pins and guide sleeves, the fixed mold plate 3 and the movable mold plate 4 are in surface contact and connected by guide pins and guide sleeves, the first pull rod 5 is clearance-matched with the hot runner plate 1, the first pull rod 5 is threadedly connected and fixed with the first extraction plate 2, the push block 6 is in surface contact and sliding cooperation with the first extraction plate 2, the push block 6 is in surface contact and limited with the hot runner plate 1, the first spring 7 is clearance-matched with the push block 6, the first spring 7 is in surface contact and limited with the hot runner plate 1, the second pull rod 8 is threadedly connected and fixed with the first extraction plate 2, the second pull rod 8 is clearance-matched with the fixed mold plate 3 and the movable mold plate 4, the fixed mold insert 9 is The fixed die plate 3 is in surface contact and tightly matched by bolts, the floating block 10 is in surface contact and tightly matched with the first draw plate 2 and is locked and fixed by bolts, the stop bar 11 is in surface contact and tightly matched with the floating block 10 and is limited by the hanging platform, the first fixed block 12 is in surface contact with the stop bar 11 and is limited by the stop bar 11, the first fixed block 12 is in surface contact and tightly matched with the second fixed block 13 and is locked and fixed by bolts, the first fixed block 12 and the second fixed block 13 are in surface contact and sliding match with the limit block 17 as a whole, the clamping block 14 is in surface contact and sliding match with the floating block 10, the ball head top screw 15 is in surface contact and limited with the clamping block 14, the ball head top screw 15 is in surface contact with the floating block 10 and is threaded and fixed The ball head top screw 15 is in surface contact with the stop bar 11 and is limited by the stop bar 11, the floating block 10 and the clamping block 14 are in surface contact and sliding cooperation with the guide block 16, the guide block 16 is in clearance cooperation with the first extraction plate 2, the guide block 16 is in surface contact and tightly cooperated with the fixed template 3 and is locked and fixed by bolts, the limit block 17 is in clearance cooperation with the first extraction plate 2, the limit block 17 is in surface contact and tightly cooperated with the fixed mold insert 9 and is locked and fixed by bolts, the insert 18 is in surface contact and tightly cooperated with the second fixed block 13 and is limited by the hanging table, the insert 18 is in surface contact and limited with the first fixed block 12, the insert 18 is in surface contact and sliding cooperation with the slider insert 21, the insert 18 is in clearance cooperation with the fixed mold insert 9 The shoulder bolt 19 is loosely matched with the first fixed block 12, the shoulder bolt 19 is threadedly connected and fixed with the fixed mold insert 9, the second spring 20 is sleeved on the shoulder bolt 19 and loosely matched, the second spring 20 is in surface contact with the first fixed block 12 and the fixed mold insert 9 and is limited, the slider insert 21 is in surface contact with the slider seat 22, connected by the hanging platform and locked and fixed by bolts, the slider seat 22 is in surface contact and sliding match with the movable mold plate 4, the slider seat 22 is in surface contact and sliding match with the movable mold insert 24, the screw 23 is threadedly connected and fixed with the clamping block 14, the screw 23 is loosely matched with the floating block 10, the movable mold insert 24 is in surface contact and tightly matched with the movable mold plate 4 and is locked and fixed by bolts. ;

[0006] The first tie rod 5 is provided with a hanging platform, the hot runner push plate 1 is provided with a countersink, and a first distance is set between the hanging platform provided on the first tie rod 5 and the bottom surface of the countersink provided on the hot runner plate 1, and the first distance is equal to the mold opening distance between the hot runner plate 1 and the first extraction plate 2;

[0007] The push block 6 is provided with a hanging platform, the first extraction plate 2 is provided with a countersunk hole, and the bottom surface of the hanging platform provided on the push block 6 and the bottom surface of the countersunk hole provided on the first extraction plate 2 are provided with a second distance, and the second distance is equal to the distance that the first spring 7 pushes the push block 6 to slide. The push blocks 6 can be set in number according to the size of the mold and are symmetrically distributed on the first extraction plate to ensure that the force exerted by the push blocks 6 on the given template 3 is uniform. The combined application of the spring 7 and the push block 6 can realize the simultaneous separation of the hot runner plate 1, the first extraction plate 2 and the fixed template 3; the second pull rod 8 is provided with A hanging platform is provided on the fixed template 3, a countersunk hole is provided on the fixed template 3, a third distance is provided between the bottom surface of the hanging platform provided on the second pull rod 8 and the bottom surface of the countersunk hole provided on the fixed template 3, and the third distance is equal to the mold opening distance between the first draw plate 2 and the fixed template 3; a hanging platform is provided on the shoulder bolt 19, a countersunk hole is provided on the first fixed block 12, a fourth distance is provided between the bottom surface of the hanging platform provided on the shoulder bolt 19 and the bottom surface of the countersunk hole provided on the fixed block 12, and the fourth distance is equal to the distance that the first fixed block 12, the second fixed block 13 and the insert 18 slide as a whole.

[0008] The floating block 10 is provided with an inclined surface, the first fixed block 12 is provided with a V-shaped groove, the clamping block 14 is provided with a first chamfer, a second chamfer, a third chamfer, an inclined surface, a first semicircular concave surface and a second semicircular concave surface, and the guide block 16 is provided with an inclined surface and a chamfer. In the mold closing state, the first chamfer and the second chamfer provided on the clamping block 14 are in surface contact with and limited by the V-shaped groove provided on the first fixed block 12, the inclined surface provided on the floating block 10 and the inclined surface provided on the clamping block 14 are in surface contact with and tightly matched with the inclined surface provided on the guide block 16, and the ball head top screw 15 is in surface contact with and limited by the second semicircular concave surface provided on the clamping block 14; in the mold opening process, under the action of the tension of the second spring 20, the first chamfer provided on the clamping block 14 applies a thrust to the first fixed block 12 to promote the first fixed block 12 to move together with the second fixed block 13 and the insert 18, and the insert 18 is separated from the slider insert 21, and under the mold opening force Under the action of, the V-shaped groove provided on the first fixed block 12 applies a reaction force to the clamping block 14, and the clamping block 14 retreats. When the ball head provided on the ball head top screw 15 contacts the first semicircular concave surface provided on the clamping block 14, the clamping block 14 stops moving, and the screw 23 moves linearly with the clamping block 14 and limits the clamping block 14; in the process of mold closing, the third chamfer provided on the clamping block 14 contacts the chamfered surface provided on the guide block 16, and the chamfer provided on the guide block 16 applies a third chamfering thrust provided on the clamping block 14 and promotes the reset of the clamping block 14. After the reset of the clamping block 14, the inclined surfaces provided on the floating block 10 and the clamping block 14 contact and slide with the inclined surfaces provided on the guide block 16; the first fixed block 12 is provided with a T-shaped through groove, and hanging platforms are respectively provided on both sides of the second fixed block 13, and the two hanging platforms provided on the second fixed block 13 are tightly matched and positioned with the T-slot provided on the first fixed block 12.

[0009] The beneficial effects of the present invention are as follows: the precision mold provided with the pre-extraction protection mechanism utilizes the joint action of the mold opening force, the first spring 7 and the push block 6 to realize the simultaneous separation of the fixed mold part template, utilizes the linear motion of the pre-extraction plate 2 to realize the movement of the floating block 10, utilizes the thrust of the floating block 10 and the clamping block 14 and the tension of the second spring 20 to realize the pre-extraction movement of the first fixed block 12, the second fixed block 13 and the insert 18, utilizes the limiting effect of the shoulder bolt 19 and the retraction effect of the clamping block 14 to realize the separation of the first fixed block 12 and the floating block 10, utilizes the chamfering pushing effect of the guide block 16 on the clamping block 14 to realize the resetting of the clamping block 14, the pre-extraction protection mechanism realizes the pre-extraction movement of the insert 18 and the retraction movement of the slider insert 21, ensures the mold opening sequence, prevents damage to the mold, saves mold cost, simplifies the mold structure, ensures the smooth production process of plastic products, improves production efficiency, and reduces the defective rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following is a detailed description of the embodiments with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the assembly of a precision mold with a pre-extraction protection mechanism. Figure 1 .

[0012] Figure 2 This is a schematic diagram of the assembly of a precision mold with a pre-extraction protection mechanism. Figure 2 .

[0013] Figure 3 This is a schematic diagram of the internal components of a precision mold with a pre-extraction protection mechanism. Figure 3 .

[0014] Figure 4 This is a schematic diagram of the internal components of a precision mold with a pre-extraction protection mechanism. Figure 4 .

[0015] Figure 5 This is a schematic diagram of the internal components of a precision mold with a pre-extraction protection mechanism. Figure 5 .

[0016] Figure 6 This is a schematic diagram of the internal components of a precision mold with a pre-extraction protection mechanism. Figure 6 .

[0017] In the figure: 1 hot runner plate; 2 first draw plate; 3 fixed plate; 4 movable plate; 5 first pull rod; 6 push block; 7 first spring; 8 second pull rod; 9 fixed mold insert; 10 floating block; 11 stop bar; 12 first fixed block; 13 second fixed block; 14 clamping block; 15 ball head top screw; 16 guide block; 17 limit block; 18 pair of inserts; 19 shoulder bolt; 20 second spring; 21 slider insert; 22 slider seat; 23 screw; 24 movable mold insert. DETAILED DESCRIPTION

[0018] The specific embodiments of the invention are described in detail below with reference to technical texts and drawings.

[0019] The present invention is implemented in the assembly of the mold structure. When assembling the mold, the guide column assembled on the hot runner plate 1 is slidably matched with the guide sleeve assembled on the first extraction plate 2, the push block 6 is assembled in the cavity processed by the first extraction plate 2, the first spring 7 is assembled in the cavity processed on the push block 6, the first pull rod 5 is assembled in the through hole processed by the hot runner plate 1, and the first pull rod 5 passes through the hot runner plate 1 and the threaded locking link processed by the first extraction plate 2 (such as Figure 1 and Figure 2 ), the block 14 is mounted in the square hole processed on the floating block 10, the ball head top screw 15 is connected and locked with the thread processed on the floating block 10, the screw 23 is connected and locked with the thread processed on the block 14, the stop bar 11 is mounted in the through groove processed on the side of the floating block 10 and limited by the hanging table, the floating block 10, the stop bar 11 and the block 14 are mounted on the first withdrawal plate 2 as a whole, and the bolt passes through the first withdrawal plate 2 to lock it (such as Figure 4 and Figure 6 ), the insert 18 is mounted in the mold cavity processed by the second fixing block 13 and limited by the hanging table, and the insert 18 and the second fixing block 13 are mounted as a whole in the T-shaped groove processed by the first fixing block 12 (such as Figure 5 ), the fixed die insert 9 is mounted in the cavity processed by the fixed die plate 3, and the bolts pass through the fixed die plate 3 to lock and fix the fixed die insert 9, the limit block 17 is mounted in the cavity processed by the fixed die insert 9, the guide block 16 is mounted in the cavity processed by the fixed die plate 3, the shoulder bolt 19 is mounted in the through hole processed by the first fixed block 12, and the second spring 20 is sleeved on the shoulder bolt 19. The first fixed block 12, the second fixed block 13, the insert 18, the shoulder bolt 19 and the second spring 20 are mounted as a whole in the cavity processed by the fixed die plate 3. The fixed die plate 3 is connected to the hot runner plate 1 and the first draw plate 2 by a guide column, and the second pull rod 8 passes through the fixed die plate 3 and is threadedly connected to the first draw plate 2 and locked (such as Figure 2 The movable mold insert 24 is installed in the mold cavity processed by the movable mold plate 4. The slider insert 21 and the slider seat 22 are limited by the hanging platform. Bolts pass through the slider insert 21 to fix it on the slider seat 22. The slider insert 21 and the slider seat 22 are installed as a whole in the mold cavity processed by the movable mold plate 4 (such as Figure 1 and Figure 4 ).

[0020] The present invention of the precision mold with a pre-extraction protection mechanism is implemented in production. During the mold injection molding process, the insert 18 and the slider insert 21 are tightly matched and sealed. After the injection molding is completed, under the action of the mold opening force and the spring tension, the hot runner plate 1, the pre-extraction plate 2 and the fixed mold plate 3 are separated at the same time, the product material is separated from the plastic product, and the insert 18 is separated from the slider insert 21. When the second pull rod 8 contacts and limits the fixed mold plate 3, the slider insert 21 and the slider seat 22 slide as a whole and detach from the undercut part of the plastic product.

[0021] The above is a superior implementation mode of the present invention. It should be pointed out that for technicians in the technical field to which the present invention belongs, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The precision mold is equipped with a pre-extraction protection mechanism, which is characterized by The structure comprises: a hot runner plate (1), a first draw plate (2), a fixed die plate (3), a movable die plate (4), a first pull rod (5), a push block (6), a first spring (7), a second pull rod (8), a fixed die insert (9), a floating block (10), a stop bar (11), a first fixed block (12), a second fixed block (13), a clamping block (14), a ball head screw (15), a guide block (16), a limit block (17), a counter-insertion (18), a shoulder bolt (19), a second spring (20), a slider insert (21), a slider seat (22), a screw (23) and a movable die insert (24);The connection relationship is as follows: the first pull rod (5) is loosely matched with the hot runner plate (1), the first pull rod (5) is threadedly connected and fixed with the first extraction plate (2), the push block (6) is surface-contacted and slidably matched with the first extraction plate (2), the push block (6) is surface-contacted and limited with the hot runner plate (1), the first spring (7) is loosely matched with the push block (6), the first spring (7) is surface-contacted and limited with the hot runner plate (1), the second pull rod (8) is surface-contacted and fixed with the first extraction plate (2), the second pull rod (8) is loosely matched with the fixed mold plate (3) and the movable mold plate (4), the floating block (10) is surface-contacted and tightly matched with the first extraction plate (2) by bolts The first fixing block (12) and the second fixing block (13) are in surface contact and tightly matched with each other and are locked and fixed by bolts. The first fixing block (12) and the second fixing block (13) are in surface contact and tightly matched with each other and are locked and fixed by bolts. The first fixing block (12) and the second fixing block (13) are in surface contact and tightly matched with each other as a whole and are in surface contact and sliding match with the limiting block (17). The clamping block (14) and the floating block (10) are in surface contact and sliding match. The ball head screw (15) and the clamping block (14) are in surface contact and limited. The ball head screw (15) and the floating block (10) are in surface contact and threaded connection. The ball head screw (15) is in surface contact with the stop bar (11) and is limited by the stop bar (11); the floating block (10) and the clamping block (14) are in surface contact and sliding cooperation with the guide block (16); the guide block (16) is in clearance cooperation with the first extraction plate (2); the guide block (16) is in surface contact and tight cooperation with the fixed template (3) and is locked and fixed by bolts; the limit block (17) is in clearance cooperation with the first extraction plate (2); the limit block (17) is in surface contact and tight cooperation with the fixed mold insert (9) and is locked and fixed by bolts; the insert (18) is in surface contact and tight cooperation with the second fixed block (13) and is limited by the hanging platform; the insert (18) is in surface contact and tight cooperation with the first fixed mold insert (9); The fixed block (12) is in surface contact and limited position, the insert (18) and the slider insert (21) are in surface contact and sliding fit, the insert (18) and the fixed mold insert (9) are in clearance fit, the shoulder bolt (19) and the first fixed block (12) are in clearance fit, the shoulder bolt (19) and the fixed mold insert (9) are threadedly connected and fixed, the second spring (20) is sleeved on the shoulder bolt (19) and is in clearance fit, the second spring (20) is in surface contact and limited position with the first fixed block (12) and the fixed mold insert (9), the screw (23) is threadedly connected and fixed with the clamping block (14), and the screw (23) and the floating block (10) are in clearance fit. ; 2. The precision mold with a pre-extraction protection mechanism as claimed in claim 1, characterized in that: The push block (6) is provided with a hanging platform, the first extraction plate (2) is provided with a countersunk hole, and a second distance is set between the bottom surface of the hanging platform provided on the push block (6) and the bottom surface of the countersunk hole provided on the first extraction plate (2), and the second distance is equal to the distance that the first spring (7) pushes the push block (6) to slide. The number of the push blocks (6) can be set according to the size of the mold, and they are symmetrically distributed on the first extraction plate to ensure that the force applied by the push blocks (6) to the given template (3) is uniform. The combined application of the spring (7) and the push block (6) can realize the simultaneous separation of the hot runner plate (1), the first extraction plate (2) and the fixed template (3); the shoulder bolt (19) is provided with a hanging platform, the first fixed block (12) is provided with a countersunk hole, and a fourth distance is set between the bottom surface of the hanging platform provided on the shoulder bolt (19) and the bottom surface of the countersunk hole provided on the fixed block (12), and the fourth distance is equal to the distance that the first fixed block (12), the second fixed block (13) and the insert (18) slide as a whole.

3. The precision mold with a pre-extraction protection mechanism as claimed in claim 1, characterized in that: The floating block (10) is provided with an inclined surface, the first fixed block (12) is provided with a V-shaped groove, the clamping block (14) is provided with a first chamfer, a second chamfer, a third chamfer, an inclined surface, a first semicircular concave surface and a second semicircular concave surface, the guide block (16) is provided with an inclined surface and a chamfer, the first chamfer and the second chamfer provided on the clamping block (14) contact and limit the V-shaped groove provided on the first fixed block (12) in the mold closing state, and the inclined surface provided on the floating block (10) and the third chamfer provided on the clamping block (14) are provided with a first chamfer, a second chamfer, a first semicircular concave surface and a second semicircular concave surface. The inclined surface of the guide block (16) contacts and fits tightly with the inclined surface provided on the guide block (16), and the ball head screw (15) contacts and limits the second semicircular concave surface provided on the clamping block (14); during the mold opening process, under the action of the tension of the second spring (20), the first chamfer provided on the clamping block (14) applies a thrust to the first fixed block (12) to promote the first fixed block (12) to move together with the second fixed block (13) and the insert (18), and the insert (18) is separated from the slider insert (21). Under the action of the mold opening force The V-shaped groove provided on the lower first fixing block (12) exerts a reaction force on the clamping block (14), and the clamping block (14) retreats. When the ball head provided on the ball head top screw (15) contacts the first semicircular concave surface provided on the clamping block (14), the clamping block (14) stops moving, and the screw (23) moves linearly with the clamping block (14) and limits the clamping block (14). During the mold closing process, the third chamfer provided on the clamping block (14) contacts the chamfered surface provided on the guide block (16), and the guide block (16) is provided with a third chamfer provided on the clamping block (14). The chamfering applies a third chamfering thrust provided on the clamping block (14) and promotes the clamping block (14) to reset. After the clamping block (14) is reset, the inclined surfaces provided on the floating block (10) and the clamping block (14) contact and slide with the inclined surface provided on the guide block (16). The first fixed block (12) is provided with a T-shaped through groove, and the second fixed block (13) is provided with hanging platforms on both sides. The two hanging platforms provided on the second fixed block (13) are tightly matched with the T-shaped groove provided on the first fixed block (12) and positioned.

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