CN111300774A - Valve core non-return screw head component - Google Patents

Abstract

The invention discloses a valve core non-return screw head component, which comprises a screw head and a valve core, wherein the screw head is provided with a front part, a middle part and a rear part, and the valve core comprises: the diameters of the front part and the rear part of the screw head are smaller than the diameter of the middle part of the screw head, an accommodating cavity is formed in the axis position of the front part of the screw head, a plurality of feeding holes communicated with the bottom wall of the accommodating cavity are formed in the circumferential surface of the rear part at intervals, and a plurality of discharging holes communicated with the side wall of the accommodating cavity are formed in the circumferential surface of the front part at intervals; the valve core is assembled in the containing cavity in a limiting mode, and the rear portion of the valve core is communicated with or blocks the feeding hole and the discharging hole in the process that the valve core slides back and forth. The valve core check screw head component has wide application range and can be generally used for all types of screw material pipes with different diameters; the material pipe is not easy to scratch, and the service life is long; and black spots which are not easy to produce scraps are generated, and the yield of transparent and bright-colored products is obviously improved.

Description

Spool check screw head assembly

technical field

The invention relates to the technical field of injection molding machines, in particular to a valve core non-return screw head assembly.

Background technique

Nowadays, the types of plastics in the injection molding industry are constantly being updated, their performance is constantly improving, and the plastic additives are also changing and increasing. . One of the most difficult problems to solve is that the large-diameter screw head group is easy to wear and tear. Using the traditional fork screw head group is easy to wear the material tube. Using the traditional ring screw head group is easy to wear the check ring and screw head, resulting in iron filings. There are black spots and black lines, and the large check ring is easy to deform in production, the processing is difficult, and the deformation is not easy to control after heating.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a valve core non-return screw head assembly in view of the above-mentioned defects in the prior art.

The present invention provides a valve core non-return screw head assembly assembled at the front end of the screw of an injection molding machine and used to open the injection sealing sol. Compared with the traditional screw head assembly, the valve core non-return screw head assembly cancels a separate anti-return screw head assembly. The non-return ring and the screw head are combined into one, and the traditional ring-interface non-return is replaced by the valve core.

To achieve the above object, the present invention adopts the following technical solutions:

The invention provides a valve core non-return screw head assembly, comprising a screw head and a valve core with a front part, a middle part and a rear part, wherein:

The diameters of the front part and the rear part of the screw head are both smaller than the diameter of the middle part, the axial center of the front part is provided with a accommodating cavity, and the circumferential surface of the rear part is spaced with a number of feeding materials communicating with the bottom wall of the accommodating cavity. a plurality of discharge holes communicated with the side wall of the accommodating cavity;

The valve core is limitedly assembled in the accommodating cavity, and the rear part of the valve core communicates or blocks the feed hole and the discharge hole during the process of the valve core sliding back and forth.

Further, on the valve core non-return screw head assembly, a plurality of the feeding holes communicate with the side wall and/or the bottom wall of the accommodating cavity, and a plurality of the feeding holes are arranged relative to the accommodating cavity. Umbrella-like arrangement.

Further, on the valve core non-return screw head assembly, a plurality of the discharge holes communicate with the side wall of the accommodating cavity, and the plurality of the discharge holes are arranged in an umbrella-like shape relative to the accommodating cavity.

Further, on the valve core non-return screw head assembly, the diameter of the front part and the rear part of the valve core are both larger than the diameter of the middle part, and the front part and the rear part are formed on the outer side of the middle part opposite to the two sides of the valve core. A limiting groove, the valve core is slidably arranged in the accommodating cavity through a plurality of positioning pins embedded in the limiting groove.

Further preferably, on the valve core anti-return screw head assembly, the upper and lower ends of the positioning pin are respectively embedded in the positioning pin holes in the front part of the screw head.

Further preferably, on the valve core non-return screw head assembly, there are two positioning pins, and they are arranged parallel to each other in the limiting grooves on both sides of the valve core middle.

Further, on the valve core check screw head assembly, the accommodating cavity is composed of a coaxially arranged front accommodating cavity and a rear accommodating cavity, and the diameter of the front accommodating cavity is larger than the diameter of the rear accommodating cavity, The rear accommodating cavity communicates with a plurality of the feeding holes, and the front accommodating cavity communicates with a plurality of the discharging holes.

Further preferably, on the valve core non-return screw head assembly, the connection between the front accommodating cavity and the rear accommodating cavity is connected by an inclined plane transition.

Further preferably, on the valve core non-return screw head assembly, the rear part of the valve core is provided with a limit cone frustum matched with the inclined surface.

Further, on the valve core anti-return screw head assembly, a connecting rod is arranged at the rear of the screw head, and the outer wall thereof is provided with threads.

The present invention adopts the above-mentioned technical scheme, compared with the prior art, has the following technical effects:

The valve core non-return screw head assembly provided by the present invention combines the non-return ring and the screw head into a whole, and the valve core non-return replaces the traditional ring-interface plane non-return. Compared with the traditional screw head assembly, it eliminates the Separate non-return ring; the valve core non-return screw head assembly has a wide range of use, and can be used for all sizes of screw barrel models; it is not easy to scratch the barrel, and has a long service life; and it is not easy to produce black spots such as iron filings. Especially for transparent and brightly colored products, the yield rate has been significantly improved.

Description of drawings

1 is a cross-sectional structural schematic diagram of a screw head in a valve core anti-return screw head assembly of the present invention;

Fig. 2 is a side view structural schematic diagram of a screw head in a valve core anti-return screw head assembly of the present invention;

Figure 3 is a schematic front view of the structure of a screw head in a valve core anti-return screw head assembly of the present invention;

FIG. 4 is a schematic three-dimensional structure diagram of a screw head in a valve core anti-return screw head assembly of the present invention;

5 is a schematic structural diagram of a valve core in a valve core check screw head assembly of the present invention;

6 is a schematic structural diagram of a positioning pin in a valve core non-return screw head assembly of the present invention;

7 is a schematic cross-sectional structural diagram of a valve core non-return screw head assembly of the present invention;

Figure 8 is a schematic three-dimensional structure diagram of a valve core non-return screw head assembly of the present invention;

Among them, each reference sign is:

10-screw head, 11-accommodating cavity, 12-feeding hole, 13-discharging hole, 14-positioning pin hole, 15-front accommodating cavity, 16-rear accommodating cavity, 17-inclined surface, 18-connecting rod; 20 -Spool, 21-limiting groove, 22-limiting cone; 30-locating pin.

Detailed ways

The present invention will be described in detail and concretely below through specific embodiments, so as to make the present invention better understood, but the following embodiments do not limit the scope of the present invention.

Referring to Figures 7-8, this embodiment provides a valve core non-return screw head assembly, which can be used to replace a common screw group with a diameter of 30-300mm. The valve core non-return screw head assembly is assembled at the front end of the screw of the injection molding machine. When the sealing sol is opened by injection, it includes a screw head 10 and a valve core 20 with smooth transition front, middle and rear parts. 20 and the screw head 10 are integrated into one body, and the anti-return function of the valve core 20 replaces the traditional ring-interface anti-return, eliminating the method of using a separate non-return ring to prevent back-flow in the prior art. The valve core 20 is limited and assembled in the accommodating cavity 11, and the rear part of the valve core 20 communicates or blocks the feed hole 12 and the discharge hole 13 during the sliding process of the valve core 20 back and forth. 20 can be assembled in the accommodating cavity 11 in any structural form.

In this embodiment, please refer to FIGS. 1-4 , the diameters of the front and rear of the screw head 10 are both smaller than the diameter of the middle thereof, and an accommodation cavity 11 is provided at the axial center of the front of the screw head 10 . The circumferential surface is spaced with a number of feeding holes 12 that communicate with the bottom wall of the accommodating cavity 11, and the circumferential surface of the front part is spaced with a number of discharge holes 13 that communicate with the side wall of the accommodating cavity 11. The screw head 10 The front part, middle part and rear part are smoothly transitioned along its circumferential surface and axial direction, and the feed hole 12 is opened on the transition slope of the middle part and the rear part, and the discharge hole 13 is opened in the front part. on the circumference of the part or on the transition slope between the front and the middle. A connecting rod 18 is disposed at the rear of the screw head 10 , the outer wall of which is provided with threads, and the screw head 10 is threadedly connected to the front end of the screw of the injection molding machine through the connecting rod 18 .

In this embodiment, please refer to FIG. 1 and FIG. 7 , a plurality of the feeding holes 12 are evenly distributed on the circumferential surface of the front part of the screw head 10 , and the side walls and/or the side walls of the accommodating cavity 11 are The bottom wall is connected, and a plurality of the feeding holes 12 are arranged in an umbrella-like shape relative to the accommodating cavity 11; as a preferred embodiment, as shown in FIG. The circumferential surface of the rear part of the head 10 is equally spaced and arranged in an umbrella-shaped structure with the accommodation cavity 11 as the center in the screw head 10 . And a plurality of the discharge holes 13 are evenly distributed on the circumferential surface of the rear of the screw head 10 and communicate with the side wall of the accommodating cavity 11 , and the plurality of the discharge holes 13 are umbrellas relative to the accommodating cavity 11 . Bone-like arrangement; as a preferred embodiment, as shown in FIG. 2 , there are five discharge holes 13 , which are distributed at equal intervals on the circumferential surface of the front part of the screw head 10 , and inside the screw head 10 It is arranged in an umbrella-shaped structure with the accommodating cavity 11 as the center.

In this embodiment, please refer to FIG. 5 , FIG. 6 and FIG. 7 , the diameters of the front and rear parts of the valve core 20 are both larger than the diameter of the middle part, and the outer part of the middle part is opposite to the front parts on both sides of the valve core 20 A limiting groove 21 is formed at the back and the valve core 20 , and the valve core 20 is slidably disposed in the accommodating cavity 11 through a plurality of positioning pins 30 embedded in the limiting groove 21 .

In this embodiment, please refer to FIG. 1 , FIG. 7 and FIG. 8 , the upper and lower ends of the positioning pin 30 are respectively embedded in the positioning pin holes 14 at the front of the screw head 10 . There are two positioning pins 30 , and they are arranged parallel to each other in the limiting grooves 21 on both sides of the middle of the valve core 20 . To assemble, first put the valve core 20 into the accommodating cavity 11 from the front of the screw head 10, and then use the positioning pin 30 to insert it from the positioning pin hole 14 at the front of the screw head 10, through the limit on both sides of the valve core The slot 21 is then protruded from the positioning pin hole 14 on the other side, and the positioning pin 11 exposed on the front surface of the screw head 10 is milled out. In addition, in order to prevent the positioning pin 11 from falling off from the positioning pin hole 14 , both ends of the positioning pin 11 are welded to the screw head 10 .

In this embodiment, please refer to FIG. 1 , the accommodating cavity 11 is composed of a coaxially arranged front accommodating cavity 15 and a rear accommodating cavity 16 , and the diameter of the front accommodating cavity 15 is larger than that of the rear accommodating cavity 16 . and the rear accommodating cavity 16 communicates with a plurality of the feeding holes 12 , and the front accommodating cavity 15 communicates with a plurality of the discharging holes 13 . The connection between the front accommodating cavity 15 and the rear accommodating cavity 16 is transitionally connected by a slope 17 . The rear part of the valve core 20 is provided with a limit cone 22 which is sealingly matched with the inclined surface 17 , and the limit cone 22 at the rear of the valve core 20 is sealed with the inclined surface 17 of the accommodating cavity 11 , In order to block the feeding hole 12 and the discharging hole 13, the feeding of the discharging hole 13 from the feeding hole 12 is stopped.

The working principle of the valve core non-return screw head assembly is: please refer to Figure 7-8, the valve core non-return screw head assembly is assembled in the thread of the screw front end through the connecting rod 18 at the rear of the screw head 10. , when the sol is used, the plastic enters the accommodation cavity 11 inside the screw head 10 from the feed hole 12 at the rear of the screw head 10. When the screw rotates, the screw teeth generate thrust to force the valve core 20 to push forward until the valve core 20 and the positioning pin 30 Abutting, that is, the rear side wall of the limiting groove 21 in the middle of the valve core 20 is in contact with the positioning pin 30 to limit the position. At this time, the feeding hole 12 is communicated with the discharging hole 13 through the accommodating cavity 11, and the plastic is self-feeding from the feeding hole 12. It is injected into the discharge hole 13 through the accommodating cavity 11 until the sol is completed; during injection, the plastic from the discharge hole 13 squeezes the valve core 20 to a certain extent, that is, the valve core 20 encounters the plastic pressure from the discharge hole 13. Naturally pushed back, the limiting cone 22 at the rear abuts against the inclined surface 17 on the accommodating cavity 11 to seal, and blocks the discharge hole 13 and the feeding hole 12 at the inclined surface 17 of the accommodating cavity 11, thereby achieve the purpose of sealing.

The specific embodiments of the present invention have been described above in detail, but they are only used as examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be included within the scope of the present invention.

Claims (10)

1. A valve core non-return screw head assembly, characterized in that it comprises a screw head (10) and a valve core (20) having a front part, a middle part and a rear part, wherein: The diameter of the front part and the rear part of the screw head (10) are both smaller than the diameter of the middle part, the axial center position of the front part is provided with a accommodating cavity (11), and the circumferential surface of the rear part is provided with several accommodating cavities at intervals. (11) feeding holes (12) communicating with the bottom wall, and a plurality of discharging holes (13) communicating with the side walls of the accommodating cavity (11) are spaced on the circumferential surface of the front part; The valve core (20) is limitedly assembled in the accommodating cavity (11), and the rear part of the valve core (20) communicates with or blocks the feed hole (12) and the outlet during the sliding process of the valve core (20) back and forth. material hole (13). 2. The valve core non-return screw head assembly according to claim 1, wherein a plurality of the feeding holes (12) communicate with the side wall and/or the bottom wall of the accommodating cavity (11), and a plurality of The feeding holes (12) are arranged in an umbrella rib shape relative to the accommodating cavity (11). 3. The valve core non-return screw head assembly according to claim 1, wherein a plurality of the discharge holes (13) communicate with the side wall of the accommodating cavity (11), and a plurality of the discharge holes (13) is arranged in the shape of an umbrella rib relative to the accommodating cavity (11). 4. The valve core non-return screw head assembly according to claim 1, characterized in that, the diameters of the front and rear parts of the valve core (20) are both larger than the diameter of the middle part, and the outer side of the middle part is opposite to the two sides of the valve core (20). Limiting grooves (21) are formed at the front and rear of the side, and the valve core (20) is slidably arranged in the accommodating cavity through a plurality of positioning pins (30) embedded in the limiting grooves (21). (11). 5. The valve core anti-return screw head assembly according to claim 4, wherein the upper and lower ends of the positioning pin (30) are respectively embedded in the positioning pin holes ( 14) within. 6. The valve core non-return screw head assembly according to claim 4, characterized in that there are two positioning pins (30), which are arranged parallel to each other on the two sides of the middle of the valve core (20). in the limit groove (21). 7. The valve core non-return screw head assembly according to claim 1, wherein the accommodating cavity (11) is composed of a coaxially arranged front accommodating cavity (15) and a rear accommodating cavity (16). The diameter of the front accommodating cavity (15) is larger than the diameter of the rear accommodating cavity (16), and the rear accommodating cavity (16) communicates with a plurality of the feeding holes (12), and the front accommodating cavity (15) A plurality of the discharge holes (13) are communicated. 8 . The valve core non-return screw head assembly according to claim 7 , wherein the connection between the front accommodating cavity ( 15 ) and the rear accommodating cavity ( 16 ) is transitionally connected by an inclined plane ( 17 ). 9 . 9 . The valve core non-return screw head assembly according to claim 8 , wherein a limit cone ( 22 ) matched with the inclined surface ( 17 ) is provided at the rear of the valve core ( 20 ). 10 . . 10 . The valve core anti-return screw head assembly according to claim 1 , wherein a connecting rod ( 18 ) is provided at the rear of the screw head ( 10 ), the outer wall of which is provided with threads. 11 .

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