CN216442932U - Fixing device for injection molding and injection molding device - Google Patents

Abstract

The embodiment of the disclosure discloses a fixing device and an injection apparatus for moulding plastics, a fixing device for moulding plastics includes sleeve and thimble, telescopic middle part is formed with the cavity, the thimble is located in the cavity be formed with the gas pocket in the sleeve, the gas pocket is formed with first oral area and second oral area, the sleeve has the loading end, the loading end is used for bearing the inserts, first oral area is located the loading end, the second oral area is used for being connected with negative pressure device.

Description

Fixing device for injection molding and injection molding device

Technical Field

The embodiment of the disclosure relates to the technical field of injection molding, in particular to a fixing device for injection molding and an injection molding device.

Background

When the housing of the product is provided with an embedded structure, the product is usually molded by injection after an insert is embedded in a mold. It is often necessary to secure the insert to the movable mold. The insert is easily dropped during mold clamping.

In the prior art, a nut insert is taken as an example, in order to prevent the nut from loosening or falling off in the mold closing process of the mold. And the thread needle matched with the nut is used, and the thread needle and the nut are integrally embedded into the mold for injection molding after being screwed up. And after the injection molding is finished, ejecting the plastic product together with the thread needle, reversely rotating the thread needle from the product, and taking down the thread needle from the nut, thereby obtaining the plastic product with the nut. However, this method is inefficient, complicated in process, and after injection molding, the threaded needle needs to be rotated in the reverse direction to be separated from the nut, which easily causes stress to be applied to the nut periphery, thereby resulting in poor nut encapsulation.

Therefore, a new technical solution is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide a fixing device for injection molding and a new technical solution of an injection molding device.

In an embodiment of the present disclosure, a fixing device for injection molding is provided, the fixing device for injection molding includes a sleeve and a thimble, a cavity is formed in a middle portion of the sleeve, the thimble is located in the cavity, an air hole is formed in the sleeve, a first opening portion and a second opening portion are formed in the air hole, the sleeve has a bearing surface, the bearing surface is used for bearing an insert, the first opening portion is located on the bearing surface, and the second opening portion is used for being connected with a negative pressure device.

Optionally, the insert is a nut, a surface of one end of the nut is opposite to the first opening, and the thimble is located in a screw hole of the nut.

Optionally, the air holes are multiple, multiple first opening portions are formed in the bearing surface of the sleeve by the air holes, and the multiple first opening portions are uniformly distributed around the thimble along the sleeve.

Optionally, the sleeve has a side surface connected to the bearing surface, a communicating cavity is formed in the sleeve, the second opening portions of the plurality of air holes communicate with the communicating cavity, and a third opening portion is provided in the side surface and communicates with the communicating cavity.

Optionally, the communication cavity is disposed around the thimble.

Optionally, the communication chamber is in communication with the cavity.

Optionally, the communicating chamber is formed by means of spark discharge.

Optionally, an axially extending groove is formed on one side of the sleeve close to the cavity, and the outer surface of the thimble and the groove jointly enclose the air hole.

Optionally, the inner diameter of the air hole is 0.8mm-1.5 mm.

In another aspect, an injection molding apparatus is provided in an embodiment of the present disclosure, the injection molding apparatus comprising the fixing apparatus for injection molding.

Through set up the gas pocket on the sleeve and form the mode of negative pressure in the gas pocket, make first mouth can form the adsorption affinity along telescopic axial to the inserts in order to adsorb the inserts at telescopic loading face. Therefore, the insert can be prevented from loosening or falling in the injection molding process.

Other features of the present description and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.

FIG. 1 is a schematic structural view of one embodiment of a fixture for injection molding of the present disclosure;

FIG. 2(a) is one of the top views of FIG. 1;

FIG. 2(b) is a second top view of FIG. 1;

FIG. 3 is a schematic view of a portion of an embodiment of an injection molding apparatus of the present disclosure;

fig. 4 is a partially enlarged view of a portion a in fig. 3.

Description of reference numerals:

10. a fixing device; 11. a sleeve; 12. a thimble; 13. a first through hole; 14. air holes; 15. a first mouth portion; 16. a bearing surface; 17. a nut; 18. a communicating cavity; 19. a third mouth portion; 20. an injection molding device; 21. and a movable mould part.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of illustrating the present disclosure and should not be construed as limiting the same. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The features of the terms first and second in the description and in the claims of the present disclosure may explicitly or implicitly include one or more of such features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specified.

In the description of the present disclosure, it is to be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing and simplifying the disclosure, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the disclosure.

In the description of the present disclosure, it should be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

According to one embodiment of the present disclosure, a fixture 10 for injection molding is provided. Referring to fig. 1, 2(a) and 2(b), a fixing device 10 for injection molding includes a sleeve 11 and a thimble 12, and a cavity is formed in a middle portion of the sleeve 11. The thimble 12 is located in the cavity. An air hole 14 is formed in the sleeve 11, and a first port 15 and a second port are formed in the air hole 14. The sleeve 11 has a bearing surface 16, and the bearing surface 16 is used for bearing the insert. The first mouth 15 is located on the bearing surface 16 and the second mouth is used for connecting with a negative pressure device.

The ejector pin 12 is disposed in the cavity and can move up and down in the axial direction of the sleeve 11 to eject the injection molding product out of the injection molding material.

The sleeve 11 has a side surface connected to the bearing surface 16.

The bearing surface 16 is used for bearing the insert. The insert may be a nut 17, bushing or sleeve.

By providing the air holes 14 in the sleeve 11 and forming a negative pressure in the air holes 14, the first port 15 can form an adsorption force in the axial direction of the sleeve 11 on the surface of the insert facing the first port 15 to adsorb the insert on the bearing surface 16 of the sleeve 11. Thus, the insert can be prevented from loosening or falling off in the injection molding process.

Furthermore, the insert can be more easily separated from the fixture 10 after injection molding. Therefore, stress generated on the encapsulation around the insert of the injection molding product can be avoided, and the technical problem of poor encapsulation is avoided.

The air holes 14 may be in communication with the cavity or spaced from the cavity.

For example, the air holes 14 may be located in the side wall of the sleeve 11, with the air holes 14 being located between the inner and outer walls of the sleeve 11, spaced from the cavity.

Specifically, the method of forming the air holes 14 is:

the sleeve 11 is prepared and a cavity is formed in the middle of the sleeve 11.

As shown in fig. 2(b), a hole is drilled downward from the bearing surface 16 of the sleeve 11 in the axial direction of the sleeve 11, and a first through hole 13 parallel to the central axis of the cavity is formed at a position between the inner wall and the outer wall of the sleeve 11, and this through hole is a part of the air hole 14.

At the position where the outer wall of the sleeve 11 corresponds to the first through hole 13, a second through hole perpendicular to the central axis of the first through hole 13 is formed in the outer wall of the sleeve 11 in a drilling manner along the radial direction of the sleeve 11 to communicate the first through hole 13 with the second through hole, the second through hole is another part of the air hole 14, the air hole 14 is formed after the first through hole is communicated with the second through hole, and a second opening is formed in the outer wall of the sleeve 11 by the second through hole.

It will be appreciated by those skilled in the art that the air holes 14 may be formed by other means, such as grinding, cutting, or extrusion.

The air holes 14 may also be provided in the inner wall of the sleeve 11 and communicate with the cavity.

For example, an axially extending groove is formed in the sleeve 11 on the side thereof adjacent the cavity. The outer surface of the thimble 12 and the groove together enclose an air hole 14.

Specifically, the groove may be formed by cutting. The cutting blade enters the cavity from one end of the cavity, and the cutting blade is in contact with the side wall of the cavity and forms a groove at a set position of the side wall of the cavity.

The groove extends axially through the inner wall of the sleeve 11 and is parallel to the central axis of the cavity.

The thimble 12 is placed in the cavity, so that the outer surface of the thimble 12 and the inner wall of the sleeve 11 jointly enclose the air hole 14.

In the above example, the first port 15 is located on the bearing surface 16, and the shape of the first port 15 is circular, rectangular, or the like. The cross-sectional shape of the first port 15 is not particularly limited.

The second mouth part is used for being connected with a negative pressure device. The negative pressure means is opened to form a negative pressure in the air holes 14 so that the first mouth 15 can attract the insert to the bearing surface 16.

The second mouth part is connected with the negative pressure device, and can also be connected with the negative pressure device through other structures.

In one example, the internal diameter of the air holes 14 is 0.8mm to 1.5 mm. In this range, the air hole 14 satisfies the suction force to the insert, and the structure of the sleeve 11 is more stable.

In one embodiment, the insert is a nut 17, a surface of one end of the nut 17 is opposite to the first port 15, and the thimble 12 is located in a threaded hole of the nut 17.

The ejector pin 12 is located in the screw hole, plays the effect of taking place on the one hand, avoids the helicitic texture of the inner wall of insert nut 17 and the inside through-hole of nut 17 to be filled by the injection molding material. On the other hand, the nut 17 also serves to fix the nut 17 and prevent the nut 17 from being displaced when the orientation of the cavity is changed.

In one embodiment, the air hole 14 is plural. The plurality of air holes 14 form a plurality of first ports 15 on a bearing surface 16 of the sleeve 11. The plurality of first mouth portions 15 are evenly distributed around the thimble 12.

This allows the insert to be more firmly attached to the surface of the load-bearing surface 16.

For example, referring to fig. 2(a) or 2(b), the number of the air holes 14 is four, and four air holes 14 form four first ports 15 on the bearing surface 16. The four first mouth portions 15 are evenly distributed around the thimble 12.

For example, six air holes 14 are formed, and six first openings 15 are formed in the bearing surface 16 of the six air holes 14. Six first portholes 15 are distributed circularly around the cavity. In this way, the fixing effect of the insert is further improved.

The number of the air holes 14 is not limited to the above-mentioned embodiments, and those skilled in the art can arrange them according to actual needs.

In one embodiment, referring to fig. 1, 2(a) or 2(b), the sleeve 11 has a side surface that is connected to the bearing surface 16. A communication chamber 18 is formed in the sleeve 11. The second openings of the plurality of air holes 14 communicate with the communication chamber 18. A third mouth 19 is provided in the side surface. The third port 19 communicates with the communication chamber 18.

The plurality of air holes 14 are parallel to each other and to the central axis of the cavity.

The second opening is positioned in the side wall and isolated from the outside. The plurality of second opening portions are communicated with the communicating cavity 18, the communicating cavity 18 is connected with a negative pressure device so as to realize negative pressure in the communicating cavity 18, and then negative pressure is formed in the air hole 14 through the second opening portions so as to adsorb the insert on the bearing surface 16.

The communication chamber 18 is disposed perpendicular to the central axis of the air hole 14.

For example, the communication chamber 18 communicates with the cavity.

The communicating cavity 18 is located on the inner wall of the sleeve 11, and the outer wall of the thimble 12 and the inner wall of the sleeve 11 together enclose the communicating cavity 18.

In one embodiment, the communicating chamber 18 is formed by means of an electric spark discharge.

Specifically, the communication chamber 18 is formed in such a manner that:

a steel needle is obtained, an electrode is obtained that matches the shape set for the communicating chamber 18, and the steel needle is connected to the electrode to form an electrode assembly.

The electrode assembly is placed in a set position within the cavity.

The electrode assembly and fixture 10 are placed in an insulating liquid.

The electrode assembly is connected to a spark machine which applies a set voltage to the electrode assembly to machine a communicating chamber communicating with the air hole.

Wherein the diameter of the steel needle assembly is smaller than the diameter of the cavity, for example, the diameter of the cavity is 1mm, and the diameter of the steel needle assembly can be between 0.1mm and 0.5 mm. Preferably, the diameter of the steel needle assembly is 0.4 mm.

Thus, the communicating cavity 18 can be formed on the cavity wall of the cavity under the condition that the cavity is small in size and the side wall of the sleeve 11 is thin.

Optionally, the electrode is a cylinder, an arc surface.

Alternatively, the electrode is copper, a copper alloy, or the like.

By this processing, the communicating chamber 18 can be formed in a cavity having a small aperture.

The number of the third mouth portions 19 may be one or plural. That is, when there is one communication chamber 18, one third port 19 may be formed in the outer wall to communicate with the communication chamber 18, or a plurality of third ports 19 may be formed in the outer wall to communicate with the communication chamber 18.

Alternatively, when the number of the third mouths 19 is plural, it may be evenly distributed around the side wall of the sleeve 11. Alternatively, when the number of the third mouth portions 19 is plural, plural negative pressure means may be connected thereto.

In one example, the communication cavity 18 is disposed around the spike 12.

For example, the communication cavity 18 is one, and the communication cavity 18 surrounds the thimble 12 and is along the side wall of the sleeve 11. The cross-sectional shape of the communication chamber 18 is arcuate or annular.

For example, the communication chamber 18 is plural. The plurality of communication chambers 18 communicate with the set second port portions, respectively. A third port 19 is formed in the outer wall of the sleeve 11 to communicate with the corresponding communication chamber 18.

In this way, the set third port 19 can be connected to the negative pressure device in a set state, respectively, to form a negative pressure in the set first port 15.

According to another embodiment of the present disclosure, an injection molding apparatus 20 is provided. Referring to fig. 4, the injection molding device 20 includes a fixing device 10.

Specifically, the injection molding device 20 includes a movable mold part 21 and a stationary mold part, and one end of the fixing device 10 is fixed to the movable mold part 21. The nut 17 is fitted over the thimble 12 and is located at an end of the fixing device 10 opposite to the movable mold portion 21.

A negative pressure is created in the air hole 14 to enable the first mouth 15 to secure e.g. a nut 17 on the bearing surface 16. The movable mold part 21 is moved and is clamped with the stationary mold part to form a mold cavity.

While injecting the molding compound into the mold cavity, the first mouth 15 is maintained to apply a negative pressure to the nut 17 to attract the nut 17 against the bearing surface 16.

After the injection molding is completed, the fixing device 10 is separated from the nut 17.

Thus, the nut 17 can be prevented from loosening or falling when the movable mold part 21 is displaced or when the orientation is changed. Meanwhile, the situation that the encapsulation of the position of the nut 17 in the injection molding product is damaged when the fixing device 10 is separated from the nut 17 is effectively avoided.

The description of "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present disclosure have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A fixture for injection molding, comprising: sleeve (11) and thimble (12), the middle part of sleeve (11) is formed with the cavity, thimble (12) are located in the cavity be formed with gas pocket (14) in sleeve (11), gas pocket (14) are formed with first oral area (15) and second oral area, sleeve (11) have loading end (16), loading end (16) are used for bearing the inserts, first oral area (15) are located loading end (16), the second oral area is used for being connected with negative pressure equipment.

2. A fixture for injection moulding according to claim 1, wherein said insert is a nut (17), the surface of one end of said nut (17) being opposite to said first mouth (15), said needle (12) being located in a threaded hole of said nut (17).

3. A fixture for injection moulding according to claim 1, wherein said air holes (14) are plural, said plural air holes (14) forming plural said first mouths (15) at a bearing surface (16) of said sleeve (11), said plural said first mouths (15) being uniformly distributed around said thimble (12) along said sleeve (11).

4. A fixture for injection molding according to claim 3, wherein the sleeve (11) has a side surface connected to the bearing surface (16), a communication chamber (18) is formed in the sleeve (11), the second mouths of the plurality of air holes (14) communicate with the communication chamber (18), and a third mouth (19) is provided at the side surface, the third mouth (19) communicates with the communication chamber (18).

5. A fixture for injection molding according to claim 4, wherein the communication cavity (18) is provided around the thimble (12).

6. A fixture for injection moulding according to claim 4, wherein said communication chamber (18) communicates with said cavity.

7. A fixture for injection moulding according to claim 4, characterised in that said communicating cavities (18) are formed by means of spark discharge.

8. A mounting arrangement for an injection moulding according to any one of claims 1 to 7 wherein an axially extending recess is formed in the sleeve (11) adjacent the cavity, the outer surface of the thimble (12) and the recess cooperating to define the air-vent (14).

9. A fixture for injection moulding according to any of the claims 1 to 7, characterised in that the inner diameter of the air holes (14) is 0.8mm-1.5 mm.

10. An injection molding apparatus comprising the fixing apparatus for injection molding according to any one of claims 1 to 9.

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