An undercut demoulding device

Abstract

The present invention relates to the technical field of injection molds, and in particular to an undercut demoulding device, which comprises a slider and a draw hook arranged outside the slider, wherein the slider is inlaid with a first inclined top and a second inclined top, the bottom of the first inclined top and the bottom of the second inclined top are both fixed on the same ejector plate, the top of the first inclined top and the top of the second inclined top both pass through the slider, the top end of the first inclined top is configured as a first hook, the top end of the second inclined top is configured as a second hook, the first hook and the second hook can be hung on the slider respectively, the undercut is formed on the first hook, the second hook can be buckled on the draw hook, the slider can push the second hook to move along the hook surface of the draw hook, and the undercut demoulding device can accurately ensure that the inclined top is completely translated out of the undercut and then further separated from the undercut product, thereby effectively avoiding the problem of the undercut being damaged by top and pull.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to an undercut demoulding device. Background Art

[0002] When producing injection molded products, sometimes the side of the injection molded product needs to be undercut without being penetrated. In this case, a sloping top structure is set on the mold to demould the product undercut. However, the current method of detaching the undercut with the sloping top still has shortcomings: since the position of the sloping top movement cannot be accurately controlled, the sloping top has an ejection movement during the movement, which can easily damage or strain the undercut product. Summary of the invention

[0003] The purpose of the present invention is to avoid the shortcomings of the prior art and provide an undercut demoulding device, which can accurately ensure that the inclined top is completely translated out of the undercut and then further separated from the undercut product, effectively avoiding the problem of the undercut being damaged and pulled.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] Provided is an undercut demoulding device, comprising a slider and a draw hook arranged outside the slider, the slider being inlaid with a first inclined top and a second inclined top, the bottom of the first inclined top and the bottom of the second inclined top being fixed on the same ejector plate, the top of the first inclined top and the top of the second inclined top both passing through the slider, the top end of the first inclined top being configured as a first hook, the top end of the second inclined top being configured as a second hook, the first hook and the second hook being respectively capable of being hung on the slider, the undercut being formed on the first hook, the second hook being capable of being buckled on the draw hook, the hook portion of the second hook being close to the hook portion of the first hook, and the slider being capable of pushing the second hook to move along the hook surface of the draw hook.

[0006] In some embodiments, the sliding block is provided with a first oblique groove and a second oblique groove, the first oblique groove and the second oblique groove are parallel to each other, the first oblique top is embedded in the first oblique groove, and the second oblique top is embedded in the second oblique groove.

[0007] In some embodiments, a cavity is defined in the slider, the ejector plate is disposed in the cavity, and the ejector plate points toward the inclined groove and can approach or move away from the inclined groove.

[0008] In some embodiments, an insert is provided on the outside of one end of the slider, the hook is fixed on the insert, the top of the first slanted top and the top of the second slanted top can both abut against the insert, and the other end of the slider is connected to a cover plate, and the cover plate and the slider constitute the cavity.

[0009] In some embodiments, a buffer spring is provided between the cover plate and the ejector plate.

[0010] In some embodiments, a limit block is provided on the ejector plate, the limit block faces the inclined groove, the ejector plate can move in the cavity, and the limit block moves with the ejector plate and can abut against the slider.

[0011] In some embodiments, the hook is an L-shaped hook, and the second hook is buckled on the flat hook surface of the L-shaped hook.

[0012] In some embodiments, an ejector pin is fixed on the ejector pin plate, and the ejector pin passes through the slider and can abut against the insert.

[0013] In some embodiments, a middle support wire is provided on the slider, the middle support wire is located in the cavity, the middle support wire is vertically pointed to the ejector plate, the middle support wire can pass through the ejector plate, and the ejector plate slides along the middle support wire.

[0014] In some embodiments, the ejector plate is provided with a first inclined ejector seat and a second inclined ejector seat, the first inclined ejector is fixed to the ejector plate through the first inclined ejector seat, and the second inclined ejector seat is fixed to the ejector plate through the second inclined ejector seat.

[0015] Beneficial effects of the undercut demoulding device of the present invention:

[0016] The undercut demoulding device of the present invention has a bottom of the first inclined top and a bottom of the second inclined top that are both fixed on the same ejector plate, and the top of the first inclined top and the top of the second inclined top both pass through the slider. Before opening the mold, the undercut is formed on the first hook of the first inclined top, and the second hook of the second inclined top is buckled on the pull hook. Since the second inclined top is hooked by the pull hook, when the slider moves along the inclined top, the thrust generated by the slider on the inclined top only pushes the second inclined top to move horizontally, that is, pushes the second hook to move horizontally along the hook surface of the pull hook, and at this time drives the first hook to move horizontally out of the undercut until the second hook moves out of the hook surface of the pull hook. Therefore, the movement distance of the first hook can be accurately controlled by controlling the hook surface stroke of the pull hook, ensuring that the first hook moves horizontally out of the undercut and then further detaches from the undercut product, effectively avoiding the problem of the undercut being damaged or pulled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of an undercut demoulding device according to an embodiment of the present invention.

[0018] Figure 2 1 is a working state diagram of the second inclined top and the draw hook according to an embodiment of the present invention.

[0019] Reference numerals

[0020] Slider 1; draw hook 2; first inclined ejector 3; second inclined ejector 4; ejector plate 5; first hook 6; second hook 7; hook surface 8; first inclined groove 9; second inclined groove 10; cavity 11; cover plate 13; undercut 12; buffer spring 14; limit block 15; ejector 16; middle support wire 17; first inclined ejector seat 18; second inclined ejector seat 19. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0022] The terms used in the present invention are only for the purpose of describing specific implementation regulations, and are not intended to limit the present invention. The singular forms "a", "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0023] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] Example 1

[0025] When producing injection molded products, sometimes it is necessary to have an undercut 12 on the non-penetrating side of the injection molded product. In this case, a sloping top structure is provided on the mold to demould the product undercut 12. However, the current method of detaching the sloping top from the undercut 12 still has shortcomings: since the position of the sloping top movement cannot be accurately controlled, the sloping top has an ejection movement during the movement, which can easily damage or strain the undercut 12 product.

[0026] In response to the above problems, the present embodiment discloses an undercut 12 demoulding device, comprising a slider 1 and a pull hook 2 arranged outside the slider 1, the slider 1 is inlaid with a first inclined top 3 and a second inclined top 4, the bottom of the first inclined top 3 and the bottom of the second inclined top 4 are both fixed on the same ejector plate 5, the top of the first inclined top 3 and the top of the second inclined top 4 both pass through the slider 1, the top end of the first inclined top 3 is constructed as a first hook 6, and the top end of the second inclined top 4 is constructed as a second hook 7, the first hook 6 and the second hook 7 can be hung on the slider 1 respectively, the undercut 12 is formed on the first hook 6, the second hook 7 can be buckled on the pull hook 2, the hook portion of the second hook 7 is close to the hook portion of the first hook 6, the slider 1 can push the second hook 7 to move along the hook surface 8 of the pull hook 2, wherein the inclined top is inclined to the side facing away from the undercut 12 product.

[0027] The mold opening operation process of the above-mentioned undercut 12 demolding device is: the slider 1 moves along the length direction of the inclined top, and the slider 1 generates a translational driving force for the inclined top, wherein the second hook 7 of the second inclined top 4 moves along the hook surface 8 of the pull hook 2, and under the limiting action of the pull hook 2, the second inclined top 4 can only move horizontally, and the second inclined top 4 drives the ejector plate 5 to move horizontally, thereby also driving the first inclined top 3 to move horizontally, so that the first hook 6 of the first inclined top 3 gradually moves horizontally out of the undercut 12, so as to avoid the first hook 6 from damaging or pulling the undercut 12 product.

[0028] In the demoulding device of the undercut 12 of the present embodiment, the bottom of the first inclined top 3 and the bottom of the second inclined top 4 are both fixed on the same ejector plate 5, and the top of the first inclined top 3 and the top of the second inclined top 4 both pass through the slider 1. Before opening the mold, the undercut 12 is formed on the first hook 6 of the first inclined top 3, and the second hook 7 of the second inclined top 4 is buckled on the draw hook 2. Since the second inclined top 4 is hooked by the draw hook 2, when the slider 1 moves along the inclined top, the thrust generated by the slider 1 on the inclined top only pushes the second inclined top 4 to move horizontally, that is, pushes the second hook 7 to move horizontally along the hook surface 8 of the draw hook 2, and at this time drives the first hook 6 to move horizontally out of the undercut 12 until the second hook 7 moves out of the hook surface 8 of the draw hook 2. Therefore, by controlling the stroke of the hook surface 8 of the draw hook 2, the movement distance of the first hook 6 can be accurately controlled to ensure that the first hook 6 moves horizontally out of the undercut 12 and then further detaches from the undercut 12 product, effectively avoiding the problem of the undercut 12 being damaged or pulled.

[0029] Example 2

[0030] For ease of understanding, an embodiment of the undercut 12 demoulding device is provided below for illustration. In practical applications, Figure 1As shown, the slider 1 is provided with a first inclined groove 9 and a second inclined groove 10 , the first inclined groove 9 and the second inclined groove 10 are parallel to each other, the first inclined top 3 is embedded in the first inclined groove 9 , and the second inclined top 4 is embedded in the second inclined groove 10 .

[0031] The first inclined top 3 is embedded in the first inclined groove 9, and the second inclined top 4 is embedded in the second inclined groove 10. On the one hand, the inclined groove facilitates the inclined top to be embedded in the slider 1, and on the other hand, when the slider 1 moves along the length of the inclined top, it can generate a driving force to push the inclined top to move horizontally.

[0032] Other components and principles are the same as those in Example 1 and will not be described in detail here.

[0033] Example 3

[0034] For ease of understanding, an embodiment of the undercut 12 demoulding device is provided below for illustration. In practical applications, Figure 1 As shown, a cavity 11 is opened in the slider 1, and the ejector plate 5 is arranged in the cavity 11. The ejector plate 5 points to the inclined groove and can approach or move away from the inclined groove.

[0035] A cavity 11 is opened in the slider 1, and the first inclined ejector 3 and the second inclined ejector 4 are translated. Under the ejection action of the first inclined ejector 3 and the second inclined ejector 4, the ejector plate 5 can move in the cavity 11, thereby further driving the inclined ejector to disengage from the undercut 12.

[0036] In this embodiment, an insert (not shown in the figure) is provided on the outside of one end of the slider 1, the hook 2 is fixed on the insert, and the insert only points to the top of the first slanted top 3 and the top of the second slanted top 4 to abut against the top of the first slanted top 3 and the top of the second slanted top 4, and the other end of the slider 1 is detachably connected to a cover plate 13, and the cover plate 13 and the slider 1 constitute the cavity 11.

[0037] The insert can fix the draw hook 2. In addition, since the insert will not move with the slider 1, when the product with undercut 12 needs to be taken out and the mold needs to be closed, the first inclined top 3 and the second inclined top 4 are hung on the slider 1. When the slider 1 moves, it will drive the first inclined top 3 and the second inclined top 4 to move. When the first inclined top 3 and the second inclined top 4 move to abut against the insert, the first inclined top 3 and the second inclined top 4 stop moving. Here the slider 1 continues to move, and the slider 1 generates a translational thrust on the first inclined top 3 and the second inclined top 4, so that the second hook 7 of the second inclined top 4 is reset to the draw hook 2. Here the hook of the first inclined top 3 is also reset to the position where the undercut 12 is formed.

[0038] The cover plate 13 is convenient for forming a cavity 11 with the slider 1 to support the ejector plate 5 .

[0039] In this embodiment, a buffer spring 14 is provided between the cover plate 13 and the ejector plate 5 .

[0040] A buffer spring 14 is provided between the cover plate 13 and the ejector plate 5 to prevent the ejector plate 5 from having a distance collision with the cover plate 13 .

[0041] Other components and principles are the same as those in Example 2 and will not be described in detail here.

[0042] Example 4

[0043] For ease of understanding, an embodiment of the undercut 12 demoulding device is provided below for illustration. In practical applications, Figure 1 As shown, a limit block 15 is provided on the ejector plate 5 , and the ejector plate 5 can move in the cavity 11 . The limit block 15 moves with the ejector plate 5 and can abut against the slider 1 .

[0044] Since the limit block 15 is facing the inclined groove, when the second inclined lifter 4 is hooked by the pull hook 2 and the slider 1 continues to approach the ejector plate 5, the limit block 15 can support the slider 1 to prevent the first inclined lifter 3 and the second inclined lifter 4 from continuing to move. At this time, the first hook 6 of the first inclined lifter 3 and the second hook 7 of the second inclined lifter 4 are prevented from colliding with the slider 1 to avoid damaging the mold.

[0045] Other components and principles are the same as those in Example 3 and will not be described in detail here.

[0046] Example 5

[0047] For ease of understanding, an embodiment of the undercut 12 demoulding device is provided below for illustration. In practical applications, Figure 1 As shown, the hook 2 is an L-shaped hook 2 , and the second hook 7 is buckled on the flat hook surface 8 of the L-shaped hook 2 .

[0048] The L-shaped hook 2 can provide a relatively flat hook surface 8, thereby improving the efficiency of movement.

[0049] Other components and principles are the same as those in Example 1 and will not be described in detail here.

[0050] Example 6

[0051] For ease of understanding, an embodiment of the undercut 12 demoulding device is provided below for illustration. In practical applications, Figure 1 As shown, an ejector pin 16 is fixed on the ejector plate 5 , and the ejector pin 16 passes through the slider 1 and can abut against the insert.

[0052] The ejector pin 16 passes through the slider 1 and can abut against the insert. When the ejector pin 16 abuts against the insert, the ejector plate 5 stops moving, and the first inclined ejector 3 and the second inclined ejector 4 can continue to move, so that only the slider 1 continues to move, thereby causing the slider 1 to translate and push the first inclined ejector 3 and the second inclined ejector 4 to reset.

[0053] In this embodiment, a middle thread 17 is provided on the slider 1 , and the middle thread 17 is located in the cavity 11 . The middle thread 17 points vertically to the ejector plate 5 , and the middle thread 17 can penetrate the ejector plate 5 , and the ejector plate 5 slides along the middle thread 17 .

[0054] The middle support wire 17 plays the role of guiding the ejector plate 5, thereby improving the accuracy of the mold.

[0055] Other components and principles are the same as those in Example 3 and will not be described in detail here.

[0056] Example 7

[0057] For ease of understanding, an embodiment of the undercut 12 demoulding device is provided below for illustration. In practical applications, Figure 1 As shown, the ejector plate 5 is provided with a first inclined ejector seat 18 and a second inclined ejector seat 19 , the first inclined ejector 3 is fixed to the ejector plate 5 via the first inclined ejector seat 18 , and the second inclined ejector 4 is fixed to the ejector plate 5 via the second inclined ejector seat 19 .

[0058] The first inclined roof seat 18 and the second inclined roof seat 19 provide installation positions for the first inclined roof 3 and the second inclined roof 4 respectively.

[0059] Other components and principles are the same as those in Example 1 and will not be described in detail here.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An undercut demoulding device, characterized in that: The invention comprises a slider and a draw hook arranged outside the slider, wherein the slider is inlaid with a first inclined top and a second inclined top, the bottom of the first inclined top and the bottom of the second inclined top are both fixed on the same ejector plate, the top of the first inclined top and the top of the second inclined top both pass through the slider, the top end of the first inclined top is configured as a first hook, the top end of the second inclined top is configured as a second hook, the first hook and the second hook can be hung on the slider respectively, the undercut is formed on the first hook, the second hook can be buckled on the draw hook, and the slider can push the second hook to move along the hook surface of the draw hook; The hook portion of the second hook is close to the hook portion of the first hook, and the top of the hook is inclined toward one side of the undercut product; The slider is provided with a first oblique groove and a second oblique groove, the first oblique groove and the second oblique groove are parallel to each other, the first oblique top is embedded in the first oblique groove, and the second oblique top is embedded in the second oblique groove; The draw hook is an L-shaped draw hook, and the second hook is buckled on the flat hook surface of the L-shaped draw hook.

2. The undercut demoulding device according to claim 1 is characterized in that: A cavity is provided in the sliding block, and the ejector plate is arranged in the cavity. The ejector plate points to the inclined groove and can approach or move away from the inclined groove.

3. The undercut demoulding device according to claim 2 is characterized in that: An insert is provided on the outside of one end of the slider, the draw hook is fixed on the insert, the top of the first slanted top and the top of the second slanted top can both abut against the insert, and the other end of the slider is connected to a cover plate, and the cover plate and the slider form the cavity.

4. The undercut demoulding device according to claim 3 is characterized in that: A buffer spring is arranged between the cover plate and the ejector plate.

5. The undercut demoulding device according to claim 3 is characterized in that: The ejector plate is provided with a limit block, the limit block faces the inclined slot, the ejector plate can move in the cavity, and the limit block moves with the ejector plate and can abut against the slider.

6. The undercut demoulding device according to claim 3 is characterized in that: An ejector pin is fixed on the ejector pin plate. The ejector pin passes through the slider and can abut against the insert.

7. The undercut demoulding device according to claim 3 is characterized in that: The slider is provided with a middle support wire, the middle support wire is located in the cavity, the middle support wire is vertically pointed to the ejector plate, the middle support wire can penetrate the ejector plate, and the ejector plate slides along the middle support wire.

8. The undercut demoulding device according to claim 1, characterized in that: The ejector plate is provided with a first inclined ejector seat and a second inclined ejector seat, the first inclined ejector is fixed to the ejector plate through the first inclined ejector seat, and the second inclined ejector seat is fixed to the ejector plate through the second inclined ejector seat.

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