CN219405294U - Secondary ejection structure of small buckle - Google Patents

Abstract

The utility model discloses a secondary ejection structure of a small buckle. The bottom needle plate is provided with a flat ejector pin in a sliding manner, the bottom end of the flat ejector pin is propped in the bottom needle plate by a wire spring, the top end of the flat ejector pin passes through the face needle plate, the B plate and the rear mold core and is arranged on the side wall of the molding cavity, and the top end of the flat ejector pin forms a back-off structure of the side wall of the buckle on the product. A circular thimble is fixed on the needle plate, and the top end of the circular thimble passes through the B plate and the rear mold core and is arranged on the bottom wall of the molding cavity. The utility model has the beneficial effects that: the structure that the back-off on the clip was taken out of the mould by force from flat thimble can satisfy the shaping requirement of the little product that still has the back-off on the clip, can satisfy when taking out of the mould by force again, and the demoulding force is little, is difficult to make the buckle on the little product warp or the requirement of damage.

Description

Secondary ejection structure of small buckle

Technical Field

The utility model relates to the technical field of injection molds, in particular to a secondary ejection structure of a small buckle.

Background

In plastic mold design, sometimes the product is encountered with a buckle, and the side wall of the buckle is also inverted. Because of the small size of such products, conventional row-level or pitched roof structures cannot be used due to insufficient space. In general, in order to meet the demolding requirement of the product back-off in the industry, a structural design is adopted, wherein a movable insert is firstly moved upwards for a certain distance by utilizing a buckle of the product under the ejection action, and then is forcibly demolded. However, the structural design that the movable insert needs to be driven to move firstly is that when small products are formed, the movable insert is driven to move firstly by the back-off on the small products, the stress on the back-off position is large, deformation or damage of the buckle easily occurs due to unsmooth action of the products when the products are strongly released, the use function of the products is affected, and the mold stripping structure of the back-off is required to be improved, wherein the mold stripping structure is suitable for the buckles of the small products.

Disclosure of Invention

Aiming at the problems existing in the prior art, the main purpose of the utility model is to provide a secondary ejection structure of a small buckle, which aims at solving the problem that the buckle is easy to deform or damage when the existing mould structure forms a small product with a back-off buckle.

In order to achieve the above object, the present utility model provides a secondary ejection structure of a small buckle, comprising: the bottom plate is provided with square irons, the inner sides of the square irons are provided with a stacked bottom needle plate and a stacked surface needle plate, and the bottom needle plate and the surface needle plate are connected with an ejection cylinder of the die through ejection rods. The top of square iron is equipped with A board and B board, is equipped with preceding mold core in the A board, is equipped with back mold core in the B board, is equipped with the shaping chamber that is used for shaping the product on the die joint of preceding mold core and back mold core. A limiting needle is fixed in the bottom plate, and a wire spring is sleeved on the limiting needle. The bottom needle plate is provided with a flat ejector pin in a sliding manner, the bottom end of the flat ejector pin is propped in the bottom needle plate by a wire spring, the top end of the flat ejector pin passes through the face needle plate, the B plate and the rear mold core and is arranged on the side wall of the molding cavity, and the top end of the flat ejector pin forms a back-off structure of the side wall of the buckle on the product. A circular thimble is fixed on the needle plate, and the top end of the circular thimble passes through the B plate and the rear mold core and is arranged on the bottom wall of the molding cavity.

Preferably, the bottom of the limit needle is provided with a T-shaped limit part, the bottom wall of the bottom needle plate is provided with a T-shaped hole, and the bottom end of the flat ejector pin is propped in the T-shaped hole by the wire spring.

Preferably, the outer wall of the flat thimble is provided with a limiting step surface, and the wire spring can prop against the flat thimble to slide until the limiting step surface props against the bottom wall of the rear mold core.

Preferably, the bottom of the bottom plate is provided with a mounting groove, the bottom of the mounting groove is provided with a through hole communicated with the top of the bottom plate, the bottom of the limiting needle is fixed in the mounting groove, and the top of the limiting needle penetrates out of the through hole.

Preferably, the mounting groove is embedded with a cushion block, and the bottom of the limiting needle is pressed and fixed in the mounting groove by the cushion block.

Compared with the prior art, the utility model has the beneficial effects that: through adopting the back-off structure of buckle lateral wall on the flat thimble shaping product to when ejecting the product through circle thimble secondary, the back-off on the buckle is from the structure of strong drawing of patterns on the flat thimble, can satisfy the shaping requirement that still has the little product of back-off on the buckle, can satisfy when strong drawing of patterns again, and the drawing of patterns power is little, is difficult to make the buckle on the little product warp or the requirement of damage.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of the whole of an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The utility model provides a secondary ejection structure of a small buckle.

Referring to fig. 1-2, fig. 1 is a block diagram of the whole of an embodiment of the present utility model, and fig. 2 is a partial enlarged view of a in fig. 1.

As shown in fig. 1-2, in an embodiment of the present utility model, the secondary ejection structure of the small buckle includes: the bottom plate 1 is provided with square iron 2, the inner side of the square iron 2 is provided with a bottom needle plate 3 and a surface needle plate 4 which are stacked, and the bottom needle plate 3 and the surface needle plate 4 are connected with an ejection cylinder of the die through ejection rods. The top of square iron 2 is equipped with A board 5 and B board 6, is equipped with preceding mold core 7 in the A board 5, is equipped with back mold core 8 in the B board 6, is equipped with the shaping chamber that is used for shaping product 9 on the die joint of preceding mold core 7 and back mold core 8. A limiting needle 10 is fixed in the bottom plate 1, and a wire spring 11 is sleeved on the limiting needle 10. The bottom needle plate 3 is provided with a flat ejector pin 12 in a sliding manner, the bottom end of the flat ejector pin 12 is propped in the bottom needle plate 3 by a wire spring 11, the top end of the flat ejector pin 12 passes through the face needle plate 4, the B plate 6 and the rear mold core 8 to be arranged on the side wall of the molding cavity, and the top end of the flat ejector pin 12 is provided with an inverted buckle structure of the side wall of the buckle 91 on the molded product 9. The bottom of the limiting needle 10 is provided with a T-shaped limiting part, the bottom wall of the bottom needle plate 3 is provided with a T-shaped hole, and the bottom end of the flat ejector pin 12 is propped in the T-shaped hole by the wire spring 11, so that the installation between the limiting needle 10 and the bottom needle plate 3 is convenient. The bottom of the bottom plate 1 is provided with a mounting groove, the bottom of the mounting groove is provided with a through hole communicated with the top of the bottom plate 1, the bottom of the limiting needle 10 is fixed in the mounting groove, and the top of the limiting needle 10 penetrates out of the through hole, so that the mounting between the limiting needle 10 and the bottom plate 1 is facilitated. The cushion block 13 is embedded in the mounting groove, and the cushion block 13 and the mounting groove can be in excessive fit or threaded fit. The bottom of the limiting needle 10 is pressed and fixed in the mounting groove by the cushion block 13, so that the limiting needle 10 is conveniently fixed, and the limiting needle 10 is conveniently detached for maintenance at a later stage.

The outer wall of the flat ejector pin 12 is provided with a limiting step surface 14, and the wire spring 11 can push the flat ejector pin 12 to slide until the limiting step surface 14 is propped against the bottom wall of the rear mold core 8, so that the condition that the flat ejector pin 12 moves for a certain distance first can be met, and the product 9 is ejected out of the rear mold core 8. A dome needle 15 is fixed to the face needle plate 4, and the tip of the dome needle 15 passes through the B plate 6 and the rear mold core 8 to be placed on the bottom wall of the molding cavity.

When the product 9 is ejected, the ejector rod pushes the bottom needle plate 3 and the flat ejector pins 12 upwards together, the flat ejector pins 12 move upwards together under the action of the pressing of the wire springs 11, and therefore the product 9 is ejected from the forming cavity of the rear mold core 8 under the common ejection force of the flat ejector pins 12 and the dome pins 15. When the flat ejector pin 12 is ejected upwards to move to the limit step surface 14 to prop against the bottom wall of the rear mold core 8, the flat ejector pin 12 cannot continue to move upwards, only the round ejector pin 15 can continue to eject upwards under the acting force of the ejector rod, secondary ejection is achieved, the inverted buckle on the buckle 91 of the product 9 is forced to be ejected from the flat ejector pin 12, and final ejection is completed.

Compared with the prior art, the utility model has the beneficial effects that: through adopting the back-off structure of buckle 91 lateral wall on flat thimble 12 shaping product 9 to when ejecting product 9 through circle thimble 15 secondary, the back-off on the buckle 91 is from the structure of strong drawing of patterns on the flat thimble 12, can satisfy the shaping requirement that still has the little product 9 of back-off on the buckle 91, can satisfy when strong drawing of patterns again, and the drawing of patterns power is little, is difficult to make the buckle 91 on the little product 9 warp or the requirement of damage.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (5)

1. A secondary ejection structure of a small buckle, comprising: the bottom plate is provided with square iron, the inner side of the square iron is provided with a bottom needle plate and a surface needle plate which are stacked, and the bottom needle plate and the surface needle plate are connected with an ejection cylinder of the die through an ejection rod; the top of the square iron is provided with an A plate and a B plate, a front mold core is arranged in the A plate, a rear mold core is arranged in the B plate, and a molding cavity for molding a product is formed in the parting surface of the front mold core and the rear mold core; the device is characterized in that a limiting needle is fixed in the bottom plate, and a wire spring is sleeved on the limiting needle; the bottom needle plate is provided with a flat ejector pin in a sliding manner, the bottom end of the flat ejector pin is propped in the bottom needle plate by the wire spring, the top end of the flat ejector pin penetrates through the surface needle plate, the B plate and the rear mold core and is arranged on the side wall of the forming cavity, and the top end of the flat ejector pin forms an inverted buckle structure of the side wall of the upper buckle of the product; the surface needle plate is fixedly provided with a round thimble, and the top end of the round thimble passes through the B plate and the rear mold core and is arranged on the bottom wall of the forming cavity.

2. The secondary ejection structure of the small buckle according to claim 1, wherein a T-shaped limiting part is arranged at the bottom of the limiting needle, a T-shaped hole is formed in the bottom wall of the bottom needle plate, and the bottom end of the flat ejector pin is propped in the T-shaped hole by the wire spring.

3. The secondary ejection structure of the small buckle according to claim 1, wherein the outer wall of the flat ejector pin is provided with a limiting step surface, and the wire spring can push the flat ejector pin to slide until the limiting step surface is propped against the bottom wall of the rear mold core.

4. The secondary ejection structure of the small buckle according to claim 1, wherein a mounting groove is formed in the bottom of the bottom plate, a through hole communicated with the top of the bottom plate is formed in the bottom of the mounting groove, the bottom of the limiting needle is fixed in the mounting groove, and the top of the limiting needle penetrates out of the through hole.

5. The secondary ejection structure of the small buckle according to claim 4, wherein a cushion block is embedded in the mounting groove, and the bottom of the limiting needle is pressed and fixed in the mounting groove by the cushion block.