Secondary core-pulling structure of injection mold with inverted buckle

Abstract

A secondary core-pulling structure of an injection mold with inverted buckles comprises a large slide seat and a horizontal injection mold insert, a small slide seat is in sliding fit with the large slide seat, an inclined guide column is sleeved on the small slide seat, a shovel base is fixed on the small slide seat, the shovel base is in sliding fit with the horizontal injection mold insert, a T-shaped groove is formed in the bottom surface of the shovel base, and the inclined guide column is sleeved on the inclined guide column. A limiting mechanism used for limiting the sliding distance of the small slide seat is arranged on the small slide seat, a bottom plate is arranged at the bottom of the large slide seat, a through groove is formed in the surface of the large slide sliding groove, a movable pin is arranged in the through groove, the bottom of the movable pin is of a slope structure, and a slope groove is formed in the bottom plate; a groove matched with the top of the movable face is formed in the bottom face of the small slide seat, and the distance between the movable pin and the groove is equal to the limiting stroke of the limiting mechanism. The two slide demolding actions are both completed in an inclined guide column mechanical mode, the traditional mode that one oil cylinder is used is omitted, the occupied space is smaller, and the mold cost is lower.

Description

Technical Field

[0001] The invention relates to the field of molds, in particular to a secondary core-pulling structure of an injection mold with an undercut. Background Art

[0002] In the process of injection mold design, due to the particularity of the structural design of some plastic products, there are two directions of demoulding undercuts in the side undercut area of ​​the product at the same time, and demoulding cannot be achieved through a single lateral movement like the ordinary lateral core pulling position. Fig.10 and attached Fig.11 The cross-sectional view of the product's undercut position when it is ejected from the mold is shown. The product needs to be designed with a side slide structure in the X direction, but there is a 7.51mm deep undercut in the Z direction hole position in the slide ejection direction, so a small slide for Z direction motion is required for ejection. For this type of slide with secondary core pulling action, the action of the small slide is generally driven by the inclined guide column fixed on the fixed mold side to move the steering shovel during the mold opening process, while the X-direction side core pulling of the large slide is driven by a cylinder. The use of a cylinder requires the design of a corresponding travel switch signal system and oil circuit system, which not only takes up a large space, but also increases the cost and processing time of the cylinder system. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a secondary core pulling structure of an injection mold with an undercut to solve the technical problems raised in the above background technology.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A secondary core-pulling structure of an injection mold with an undercut, comprising a large travel seat and a horizontal injection molding insert fixed on the large travel seat, the large travel seat is provided with a large travel slot arranged along its stroke direction, a small travel seat is slidably matched in the large travel slot, an inclined guide column is mounted on the small travel seat, a shovel base is fixedly connected to the small travel seat in the horizontal direction, the shovel base is slidably matched on the horizontal injection molding insert, a T-slot is provided on the surface of the shovel base to form a certain angle with the horizontal direction, and a sliding groove is provided in the T-slot. The movable fit has a vertical injection-molded insert, and a limiting mechanism for limiting the sliding distance of the small row seat is arranged on the small row seat. A bottom plate is arranged at the bottom of the large row seat, and a through groove penetrating downward through the large row seat is arranged on the surface of the large row slide groove. A movable pin is arranged in the through groove, and the bottom of the movable pin is an inclined structure. An inclined groove matching the bottom of the movable pin is arranged on the bottom plate, and a groove matching the top of the movable pin is arranged on the bottom surface of the small row seat, and the distance between the movable pin and the groove is equal to the limiting stroke of the limiting mechanism.

[0006] In the above invention content, further, the limit mechanism includes a limit block and a limit groove provided on the small row seat and arranged along the travel direction of the small row seat, the limit block and the limit groove are perpendicular to each other, one end of the limit block is fixed on the large row seat, and the other end of the limit block extends into the limit groove.

[0007] In the above invention, further, the movable pin is a square block, and the four corners of the square block are provided with chamfered surfaces, and the bottom and top of the movable pin are respectively matched with the inclined surface groove and the groove through the chamfered surfaces.

[0008] In the above invention, further, the horizontal injection molded insert is provided with a horizontal injection molded insert slide groove, and the shovel base is slidably fitted on the horizontal injection molded insert through the horizontal injection molded insert slide groove.

[0009] In the above invention, further, a slider base is provided below the large slider seat, and the slider base is provided with large slider pressure strips arranged on both sides of the large slider seat.

[0010] In the above invention, further, a large row seat travel limit block for limiting the ejection stroke of the large row seat is provided in the travel direction of the large row seat.

[0011] The beneficial effects of the present invention are:

[0012] The present invention can perform mold opening action through inclined guide pins, and drive the small slide seat and the large slide seat on the secondary core pulling combination slide to demold in sequence according to the set action sequence. The two slide demolding actions are completed mechanically through the inclined guide pins, eliminating the traditional method of using one oil cylinder. Compared with the traditional oil cylinder drive method, the present invention occupies less space and has lower mold cost. Since the oil cylinder pulling action after the injection mold is opened is reduced, the injection cycle time is reduced. It has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 for Figure 1 Middle AA section view;

[0015] Figure 3 This is a schematic diagram of the structure of the large sliding slot of the present invention;

[0016] Figure 4 This is a schematic diagram of the connection structure between the shovel base and the horizontal injection molded insert of the present invention;

[0017] Figure 5 It is a schematic diagram of the connection structure between the vertical injection molded insert and the shovel base of the present invention;

[0018] Figure 6It is a schematic diagram of the movable pin structure of the present invention;

[0019] Figure 7 This is a motion state diagram of the small sliding seat during Z-direction demoulding of the present invention;

[0020] Figure 8 for Figure 7 Middle BB section view;

[0021] Fig. 9 This is a motion state diagram after demoulding of the present invention;

[0022] Fig.10 It is a schematic diagram of the demoulding product structure;

[0023] Fig.11 for Fig.10 Middle CC section view.

[0024] In the figure, 1-large row seat, 2-horizontal injection molding insert, 3-large row slide, 4-small row seat, 5-inclined guide column, 6-shovel base, 7-T-slot, 8-vertical injection molding insert, 9-bottom plate, 10-through slot, 11-movable pin, 12-inclined slot, 13-groove, 14-limiting slot, 15-limiting block, 16-horizontal injection molding insert slide, 17-row seat, 18-pressing strip. 19-large row seat travel limit block. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0027] Example:

[0028] A secondary core pulling structure of an injection mold with an undercut, see the attached Figure 1 -Attached Figure 3As shown, it includes a large travel seat 1 and a horizontal injection molded insert 2 fixed on the large travel seat 1. The large travel seat 1 is provided with a large travel slot 3 arranged along its travel direction. A small travel seat 4 is slidably fitted in the large travel slot 3. An inclined guide column 5 is mounted on the small travel seat 4. A shovel base 6 is fixedly connected to the small travel seat 4 in the horizontal direction. The shovel base 6 is slidably fitted on the horizontal injection molded insert 2. For details, please continue to refer to the attached Figure 4 and attached Figure 5 As shown, the horizontal injection molding insert 2 is provided with a horizontal injection molding insert slide 16, and the shovel base 6 is slidably fitted on the horizontal injection molding insert 2 through the horizontal injection molding insert slide 16. The bottom surface of the shovel base 6 is provided with a T-shaped groove 7 that forms a certain angle with the horizontal direction, and the vertical injection molding insert 8 is slidably fitted in the T-shaped groove 7. Figure 3 As shown, the surface of the large row position slide 3 is provided with a through groove 10 that penetrates downward through the large row position seat 3. Figure 2 As shown, a movable pin 11 is arranged in the through slot 10, and the bottom of the movable pin 11 is an inclined surface structure. A bottom plate 9 is arranged at the bottom of the large row seat 1, and an inclined surface groove 12 is arranged on the bottom plate 9 to match the bottom of the movable pin 11. A groove 13 is arranged on the bottom surface of the small row seat 4 to match the top of the movable pin 11. For details, please refer to the attached Figure 6 As shown, the movable pin 11 is a square block, and chamfered surfaces are provided at the four corners of the square block. The bottom and top of the movable pin 11 are respectively matched with the inclined surface groove 12 and the groove 13 through the chamfered surfaces.

[0029] The small travel seat is provided with a limit mechanism for limiting the sliding distance of the small travel seat 4, and the distance between the movable pin 11 and the groove 13 is equal to the limit stroke of the limit mechanism. Figure 1 As shown, the limiting mechanism includes a limiting block 15 and a limiting groove 14 provided on the small travel seat 4 and arranged along the travel direction of the small travel seat 4. The limiting block 15 and the limiting groove 14 are perpendicular to each other. One end of the limiting block 15 is fixed on the large travel seat 1, and the other end of the limiting block 15 extends into the limiting groove 14. When the small travel seat 4 slides along the sliding travel direction, the inner wall of the limiting groove 14 away from the limiting block abuts against the limiting block 15, thereby playing a role in sliding limiting the small travel seat 4. The length of the limiting groove 14 is the limiting travel of the entire limiting mechanism (that is, the maximum movement distance of the small travel seat 4 in the travel direction), and the distance from the movable pin 11 to the groove 13 is equal to the limiting travel.

[0030] The present invention is specific to the working process, see the attached Figure 8As shown, when the mold is opening, the inclined guide column 5 moves upward along the sleeve hole on the small row seat 4. The inclined guide column 5 drives the small row seat 4 to move along the X direction during the upward movement, and the small row seat 4 drives the shovel base 6 to slide along the X direction. Since the shovel base 6 slides with the vertical injection molding insert 8 through the T-slot 7, the T-slot 7 and the X direction have an angle θ. The shovel base 6 drives the vertical injection molding insert 8 to move upward during the sliding process along the T-slot, thereby achieving the purpose of demolding the product in the Z direction. It should be noted that the sliding stroke S of the shovel base 6 along the X direction and the moving distance L of the vertical injection molding insert 8 along the Z direction have the following trigonometric function relationship: tanθ=L / S; therefore, in the process of mold design, the angle θ can be designed according to the demolding height of the product in the Z direction and the sliding stroke S of the shovel base 6 along the X direction.

[0031] Continue to refer to the attached Figure 7 As shown, during the sliding process of the small traveler seat 4 along the large traveler seat 1, when the limit block 15 contacts the side wall of the limit groove 14, the small traveler seat 4 stops sliding. Figure 8 As shown in the figure, due to the limit stroke of the limit groove 14 and the distance from the movable pin 11 to the groove 13, when the small travel seat 4 stops sliding, the groove 13 at the bottom of the small travel seat 4 just moves to the top of the movable pin 11. As the mold opening action continues, under the action of the limit block 15, the inclined guide column 5 drives the large travel seat 1 to move along the X direction. At the same time, the inclined surface of the inclined groove 12 will squeeze the chamfered inclined surface at the bottom of the movable pin 11, thereby causing the movable pin 11 to move upward, and the top of the movable pin 11 enters the groove 13. See the attached Fig. 9 As shown, the large row seat 1 and the small row seat 4 are connected into a whole under the action of the movable pin 11 and move together along the X direction under the drive of the inclined guide column 5. During the movement, the large row seat 1 drives the horizontal injection molded insert 2 to be pulled out from the product along the X direction, and finally completes the demoulding of the product in the X direction and the Z direction.

[0032] When the mold is closed, the inclined guide column 5 drives the large row seat 1 and the small row seat 4 to move backward together. When the movable pin 11 moves to the position of the inclined groove 12, the movable pin 11 falls into the inclined groove 12, completing the resetting of the large row seat 1 and the horizontal injection molding insert 2. After the large row seat 1 is reset, the inclined guide column 5 continues to drive the small row seat 4 to slide backward along the large row seat 1. During the sliding process, the small row seat 4 drives the shovel base 6 to retreat. During the retreat process of the shovel base 6, the vertical injection molding insert 8 completes the resetting in the Z direction through the T-slot 7.

[0033] In the above embodiment, a slide base 17 is provided below the large slide seat 1, and large slide pressure strips 18 are provided on the slide base 17 and arranged on both sides of the large slide seat 1 to enhance the movement stability of the large slide seat 1. Furthermore, a large slide seat travel limit block 19 is provided in the travel direction of the large slide seat 1 to limit the demoulding travel of the large slide seat 1, so as to limit the demoulding travel of the large slide seat 1.

[0034] From the above, it can be seen that the present invention uses the inclined guide column 5 to perform the mold opening action, and drives the small slide seat 4 and the large slide seat 1 on the secondary core-pulling demolding combination slide to demold in sequence according to the set action sequence. The two slide demolding actions are completed mechanically by the inclined guide column 5, eliminating the traditional X-direction demolding method of using a cylinder. Therefore, compared with the traditional cylinder-driven method, the present invention occupies less space and has lower mold costs. Since the cylinder pulling action after the injection mold is opened is reduced, the injection cycle time is reduced. It has significant economic benefits and is suitable for promotion and use in industrial production processes.

[0035] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A secondary core pulling structure of an injection mold with an undercut, characterized in that: The shovel base is fixedly connected to the small row seat in the horizontal direction, and the shovel base is slidably matched with the horizontal injection molded insert. The bottom surface of the shovel base is provided with a T-slot which forms a certain angle with the horizontal direction, and a vertical injection molded insert is slidably matched in the T-slot. A limit mechanism for limiting the sliding distance of the small row seat is provided on the small row seat, and a bottom plate is provided at the bottom of the large row seat, and a through groove which penetrates the large row seat downward is provided on the surface of the large row seat, and a movable pin is provided in the through groove, and the bottom of the movable pin is an inclined surface structure, and an inclined surface groove which cooperates with the bottom of the movable pin is provided on the bottom plate, and a groove which cooperates with the top of the movable pin is provided on the bottom surface of the small row seat, and the distance between the movable pin and the groove is equal to the limit stroke of the limiting mechanism.

2. The secondary core pulling structure of the injection mold with undercut according to claim 1, characterized in that: The limit mechanism includes a limit block and a limit groove which is arranged on the small travel seat and along the travel direction of the small travel seat. The limit block and the limit groove are perpendicular to each other. One end of the limit block is fixed on the large travel seat, and the other end of the limit block extends into the limit groove.

3. The secondary core pulling structure of the injection mold with undercut according to claim 2, characterized in that: The movable pin is a square block, and the four corners of the square block are all provided with chamfered inclined surfaces, and the bottom and top of the movable pin are respectively matched with the inclined surface groove and the groove through the chamfered inclined surfaces.

4. The secondary core pulling structure of the injection mold with undercut according to claim 1, characterized in that: The horizontal injection molding insert is provided with a horizontal injection molding insert slide groove, and the shovel base is slidably matched on the horizontal injection molding insert through the horizontal injection molding insert slide groove.

5. The secondary core pulling structure of the injection mold with undercut according to claim 1, characterized in that: A slide base is provided below the large slide seat, and large slide pressure strips arranged on both sides of the large slide seat are provided on the slide base.

6. The secondary core pulling structure of the injection mold with undercut according to claim 1, characterized in that: A large row seat travel limit block for limiting the ejection stroke of the large row seat is arranged in the travel direction of the large row seat.

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