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 demoulding actions are both completed in an inclined guide pillar mechanical mode, the traditional mode of using one oil cylinder is cancelled, the occupied space is smaller, and the mould cost is lower.

Description

Technical Field

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

[0002] During the injection mold design process, due to the particularity of the structural design of some plastic products, the side undercut area of ​​the product has two directions of demoulding undercuts at the same time, and demoulding cannot be achieved through a single lateral movement like the ordinary lateral core pulling position. Figure 10 and attached Figure 11 The cross-section of the product's undercut during demolding is shown. The product requires an X-direction side slide structure, but there is a 7.51mm-deep Z-direction hole undercut in the slide's demolding direction, necessitating the addition of a small slide for Z-direction demolding. For this type of secondary core-pulling slide, the small slide is typically driven by a diagonal guide column fixed to the fixed mold side, which triggers a steering shovel during mold opening. The X-direction side core pulling of the large slide is driven by a hydraulic cylinder. Using a hydraulic cylinder requires the design of a corresponding travel switch signal system and oil circuit system, which not only takes up a lot of space but also increases the cost and processing time of the hydraulic cylinder system. Utility Model Content

[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-mentioned background technology.

[0004] The purpose of this utility model is achieved through the following technical solutions:

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

[0006] In the above-mentioned utility model, further, the limiting mechanism includes a limiting block and a limiting groove arranged on the small row seat and along the travel direction of the small row seat. The limiting block and the limiting groove are perpendicular to each other, one end of the limiting block is fixed on the large row seat, and the other end of the limiting block extends into the limiting groove.

[0007] In the above utility model, 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 respectively cooperate with the inclined surface groove and the groove through the chamfered surfaces.

[0008] In the above utility model, 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 utility model, further, a slide base is provided below the large slide seat, and the slide base is provided with large slide pressure strips arranged on both sides of the large slide seat.

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

[0011] The beneficial effects of the utility model are:

[0012] This utility model utilizes inclined guide pins to perform mold opening. This action sequence drives the small and large slide seats on the secondary core-pulling assembly slide to sequentially release the mold. Both slides' mold release actions are mechanically accomplished via the inclined guide pins, eliminating the traditional use of a single hydraulic cylinder. Compared to traditional hydraulic cylinder-driven methods, this utility model occupies less space and reduces mold costs. By eliminating the hydraulic cylinder's movement after mold opening, the injection cycle time is shortened, resulting in significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

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

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

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

[0017] Figure 5 This is a schematic diagram of the connection structure between the vertical injection molded insert and the shovel base of the utility model;

[0018] Figure 6 This is a schematic diagram of the structure of the movable pin of the utility model;

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

[0020] Figure 8 for Figure 7 Middle BB cross-section;

[0021] Figure 9 This is a motion state diagram of the utility model after demoulding;

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

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

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

[0025] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they 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. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type 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 traveler seat 1 and a horizontal injection molded insert 2 fixed on the large traveler seat 1. The large traveler seat 1 is provided with a large traveler slot 3 arranged along its travel direction. A small traveler seat 4 is slidably fitted in the large traveler slot 3. The small traveler seat 4 is fitted with an inclined guide column 5. A shovel base 6 is fixedly connected to the small traveler seat 4 in the horizontal direction. The shovel base 6 is slidably fitted on the horizontal injection molded insert 2. For details, please 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 chute 16, and the shovel base 6 is slidably fitted on the horizontal injection molding insert 2 through the horizontal injection molding insert chute 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 passes through the large row position seat 3 downward. Figure 2 As shown, a movable pin 11 is provided in the through slot 10, and the bottom of the movable pin 11 is a sloped structure. The bottom of the large row seat 1 is provided with a bottom plate 9, and the bottom plate 9 is provided with a sloped groove 12 that matches the bottom of the movable pin 11. The bottom surface of the small row seat 4 is provided with a groove 13 that matches 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 traveler seat 4 and arranged along the travel direction of the small traveler 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 to the large traveler seat 1, and the other end of the limiting block 15 extends into the limiting groove 14. When the small traveler seat 4 slides along the sliding stroke direction, the inner wall of the limiting groove 14 away from the limiting block abuts against the limiting block 15, thereby limiting the sliding of the small traveler seat 4. The length of the limiting groove 14 is the limiting stroke of the entire limiting mechanism (that is, the maximum movement distance of the small traveler seat 4 in the stroke direction), and the distance from the movable pin 11 to the groove 13 is equal to this limiting stroke.

[0030] The utility model is specific to the working process, see the attached Figure 8As shown, when the mold is opening, the inclined guide pin 5 moves upward along the sleeve hole on the small slider seat 4. This upward movement drives the small slider seat 4 in the X-direction, while simultaneously driving the shovel base 6 in the X-direction. Because the shovel base 6 slides with the vertical injection molded insert 8 via the T-slot 7, which forms an angle θ with the X-direction, the shovel base 6 slides along the T-slot, driving the vertical injection molded insert 8 upward, thereby achieving the purpose of demolding the product in the Z-direction. It should be noted that the sliding travel S of the shovel base 6 in the X-direction and the travel L of the vertical injection molded insert 8 in the Z-direction have the following trigonometric relationship: tanθ = L / S. Therefore, during mold design, the angle θ can be designed based on the product's Z-direction demolding height and the sliding travel S of the shovel base 6 in the X-direction.

[0031] Continue to refer to the attached Figure 7 As shown in FIG, when the small traveler seat 4 slides 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, due to the limiting stroke of the limiting groove 14 and the distance from the movable pin 11 to the groove 13, when the small slide seat 4 stops sliding, the groove 13 at the bottom of the small slide seat 4 just moves to the top of the movable pin 11. As the mold opening action continues, under the action of the limiting block 15, the inclined guide column 5 drives the large slide 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 Figure 9 As shown, the large slide seat 1 and the small slide seat 4 are connected into a whole by 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 slide 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 and Z directions.

[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 reset 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. The vertical injection molding insert 8 completes the reset in the Z direction through the T-slot 7 during the retreat of the shovel base 6.

[0033] In the above embodiment, a slide base 17 is provided under 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 stroke of the large slide seat 1, which is used to limit the demoulding stroke of the large slide seat 1.

[0034] As can be seen from the above, the present invention utilizes an inclined guide pin 5 to perform mold opening, driving the small slide seat 4 and the large slide seat 1 of the secondary core-pulling demolding assembly slide in a predetermined sequence to sequentially release the slides. Both slide demolding operations are mechanically accomplished by the inclined guide pin 5, eliminating the traditional X-direction demolding method that uses a single cylinder. Therefore, compared to traditional cylinder-driven methods, the present invention occupies less space and has lower mold costs. By reducing the cylinder's pulling motion after mold opening, the injection cycle time is shortened. This offers significant economic benefits and is suitable for widespread use in industrial production processes.

[0035] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A secondary core-pulling structure of an injection mold with an undercut, characterized in that: The top of the small movable frame is provided with a groove, and the bottom of the small movable frame is provided with a groove, and the bottom of the small movable frame is fixed with a tooth.

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

3. The secondary core-pulling structure of the injection mold with an undercut according to claim 2, characterized in that: The movable pin is a square block, and the four corners of the square block are provided with chamfered inclined surfaces. 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 an 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 an 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 an undercut according to claim 1, characterized in that: A large travel seat travel limit block for limiting the ejection stroke of the large travel seat is provided in the travel direction of the large travel seat.

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