CN217531762U - Injection molding screw head structure - Google Patents

Abstract

The utility model relates to an injection molding screw head structure, which comprises a conical screw head and a screw main body; a check ring and a mixing ring are sequentially arranged between the screw head and the screw body; one side of the non-return ring, which is close to the mixing ring, is provided with a non-return ring seat; the screw body is provided with threads; the mixing ring is provided with a plurality of pins; the pins are distributed in an inclined way and are distributed in the reverse direction of the screw thread. The utility model is not only provided with a non-return ring for preventing the backflow of the melt, but also provided with a mixing ring for refining plastic particles, the pressure of the melt is greater than the pressure at the screw head at the front end of the non-return ring during pre-molding, and the melt pushes the non-return ring open and is continuously gathered towards the front end of the screw head; during injection, the melt pressure at the screw head is increased, the check ring is forced to move backwards to the check ring seat, and the end faces of the check ring seat and the check ring seat are tightly attached, so that the melt channel is closed, and backflow is prevented. Meanwhile, the distribution of the pins on the mixing ring and the threads of the screw body are in reverse distribution, so that plastic particles can be crushed and refined from two directions.

Description

Injection molding screw head structure

Technical Field

The utility model belongs to the technical field of the screw rod preparation, concretely relates to screw rod head structure of moulding plastics.

Background

An injection molding machine, also known as an injection molding machine or an injection machine, is a main molding device for manufacturing thermoplastic plastics or thermosetting plastics into plastic products with various shapes by utilizing a plastic molding die, and can heat the plastics and apply high pressure to the molten plastics so as to inject the molten plastics to fill a die cavity of the die; the injection molding machine screw is one of the key parts of the injection molding machine, and the injection molding screw is required to rotate in the cylinder during the operation of the injection molding machine, so that solid polymer particles or powder are melted and plasticized, then plastic is injected into a mold for molding, and the plastic product can be obtained after the mold is cooled and ejected out. However, the existing melt flows backward along the gap between the screw and the barrel, thereby affecting the accuracy of the injection pressure and the injection amount.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a take screw rod head structure of moulding plastics of non-return ring and thoughtlessly linking ring.

An injection molded screw head structure comprising: the screw head and the screw body are conical; a check ring and a mixing ring are sequentially arranged between the screw head and the screw body; one side of the non-return ring, which is close to the mixing ring, is provided with a non-return ring seat; the screw rod main body is provided with threads; the mixing ring is provided with a plurality of pins; the pins are distributed in an inclined shape and are distributed in a reverse direction in the distribution of the threads.

Wherein, one side of the non-return ring seat, which is contacted with the non-return ring, is provided with an inclined conical shaft shoulder; the conical shaft shoulder inclines outwards from the side of the non-return ring to the side of the non-return ring seat and is matched with an inclined plane formed by the non-return ring close to one end of the non-return ring seat.

The screw head is provided with a U-shaped injection molding groove; the U-shaped injection molding grooves are at least three and distributed in an annular array by taking the axial lead of the screw head as the center.

The bottom surface of the U-shaped injection molding groove is an arc-shaped surface.

Wherein, the non-return ring is sleeved outside the screw head rod; a molten plastic channel is formed between the check ring and the screw head rod; the U-shaped injection molding groove is communicated with the molten plastic channel.

The pins are distributed in an annular array in a 45-degree inclined mode and are distributed according to the left-hand thread law.

The threads of the screw body are distributed along the surface of the screw body in an annular mode in an inclined mode of 45 degrees, and the threads are distributed according to the right-hand thread law.

Wherein, the pin is a protruding diamond pin.

The utility model discloses following beneficial effect has:

the utility model discloses in not only have the non-return ring that prevents the melt refluence, the mixing ring that refines is carried out plastic granules in addition. The check ring has the function similar to a check valve, the pressure of the molten material is greater than the pressure of the screw head at the front end of the check ring during pre-molding, and the molten material pushes the check ring open and is continuously gathered towards the front end of the screw head; during injection, the pressure of the molten material at the screw head is increased, the non-return ring is forced to move backwards to the non-return ring seat, and the end faces of the non-return ring and the non-return ring seat are tightly attached, so that a molten material channel is closed, and backflow is prevented. Meanwhile, the distribution of the pins on the mixing ring and the threads of the screw body are in reverse distribution, so that plastic particles can be crushed and refined from two directions, and the plasticizing capacity of the screw can be improved to a greater extent.

Drawings

FIG. 1 is a schematic structural view of an injection molding screw head structure of the present invention;

fig. 2 is a partial sectional view of the screw head structure of the utility model.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "two end," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "connected," "fixed," and "screwed" are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

As shown in fig. 1 and 2, an injection-molded screw head structure includes: a screw head 1 and a screw body 2 which are in a cone shape; a non-return ring 3 and a mixing ring 4 are sequentially arranged between the screw head 1 and the screw body 2; one side of the non-return ring 3, which is close to the mixing ring 4, is provided with a non-return ring seat 5; the screw rod main body 2 is provided with threads 6; the mixing ring 4 is provided with a plurality of pins 7; the pins 7 are distributed in an inclined shape and are distributed in a reverse direction to the distribution of the screw threads 6. The utility model discloses in not only have the non-return ring 3 that prevents the melt refluence, the mixing ring 4 that refines is carried out plastic granules in addition. The check ring 3 has the function similar to a check valve, the pressure of the molten material is greater than the pressure of the screw head 1 at the front end of the check ring 3 during pre-molding, and the molten material pushes the check ring 3 open and is continuously gathered towards the front end of the screw head 1; during injection, the melt pressure at the screw head 1 is increased, the check ring 3 is forced to move backwards to the check ring seat 5, and the end faces of the check ring and the check ring seat are tightly attached, so that the melt channel is closed, and backflow is prevented. Meanwhile, the distribution of the pins on the mixing ring 4 and the threads 6 of the screw body 2 are in reverse distribution, so that the plastic particles can be crushed and refined from two directions, and the plasticizing capacity of the screw can be improved to a greater extent.

Wherein, the contact side of the non-return ring seat 5 and the non-return ring 3 is provided with an inclined conical shaft shoulder 8; said tapered shoulder 8 is inclined upward from the side of check ring 3 toward the side of check ring seat 5, and is fitted with an inclined surface 11 formed at an end of check ring 3 close to check ring seat 5. Namely, the larger end of the conical shaft shoulder 8 faces the screw main body 2, the conical shaft shoulder 8 can guide flow during pre-molding, and can play a role in avoiding backflow of molten plastic during injection, and the inclined conical shaft shoulder 8 and the inclined plane 11 at the end part of the non-return ring 3 can increase the sealing degree of the two.

The screw head 1 is provided with a U-shaped injection molding groove 9; the number of the U-shaped injection molding grooves 9 is at least three, and the U-shaped injection molding grooves are distributed in an annular array by taking the axial lead of the screw head 1 as the center. The non-return ring 3 is sleeved outside the screw head rod 10; a molten plastic channel 12 is formed between the check ring 3 and the screw head rod 10; the U-shaped injection molding groove 9 communicates with a molten plastic channel 12. The screw head 1 is a cone, so that the flow resistance of the molten material during injection can be reduced, and the decomposition phenomenon caused by temperature rise due to stagnation of the molten material is prevented; and the outer side of the screw head 1 is provided with a U-shaped injection molding groove 9 with an arc-shaped bottom surface, and the molten plastic flows out of the U-shaped injection molding groove 9 through a molten plastic channel 12 and then gathers at the front end of the screw head 1 to prepare for injection molding.

The distribution of the pins on the mixing ring 4 and the screw threads 6 of the screw body 2 are in reverse distribution, in the embodiment, the pins 7 on the mixing ring 4 are not arranged to be distributed along the circumference, but are distributed in an annular array in an inclined way of 45 degrees, and the pins 7 are convex diamond-shaped pins according with the left-hand screw thread law; the threads 6 distributed on the surface of the screw body 2 opposite to the screw body in the direction are distributed in a right-hand thread law mode and are inclined at 45 degrees, namely the threads are perpendicular to each other at 90 degrees, so that plastic particles can be refined and sheared, and the plasticizing capacity of a screw head structure on molten materials is improved.

The details of the present invention are well known to those skilled in the art.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (8)

1. The utility model provides a screw head structure of moulding plastics which characterized in that includes:

the screw head and the screw body are conical;

a check ring and a mixing ring are sequentially arranged between the screw head and the screw body;

one side of the non-return ring, which is close to the mixing ring, is provided with a non-return ring seat;

the screw rod main body is provided with threads;

the mixing ring is provided with a plurality of pins;

the pins are distributed in an inclined shape and are distributed in a reverse direction in the distribution of the threads.

2. An injection molding screw head structure according to claim 1,

one side of the non-return ring seat, which is in contact with the non-return ring, is provided with an inclined conical shaft shoulder;

the conical shaft shoulder inclines outwards from the side of the non-return ring to the side of the non-return ring seat and is matched with an inclined plane formed by the non-return ring close to one end of the non-return ring seat.

3. An injection molding screw head structure according to claim 1,

the screw head is provided with a U-shaped injection molding groove;

the U-shaped injection molding grooves are at least three and are distributed in an annular array by taking the axial lead of the screw head as the center.

4. An injection molding screw head structure according to claim 3,

the bottom surface of the U-shaped injection molding groove is an arc-shaped surface.

5. An injection molding screw head structure according to claim 3,

the non-return ring is sleeved outside the screw head rod;

a molten plastic channel is formed between the check ring and the screw head rod;

the U-shaped injection molding groove is communicated with the molten plastic channel.

6. An injection molding screw head structure according to claim 1,

the pins are distributed in an annular array in an inclined manner of 45 degrees and accord with the left-hand thread law.

7. An injection molding screw head structure according to claim 1,

the screw thread of the screw rod main body is inclined at 45 degrees and is annularly distributed along the surface of the screw rod main body, and the screw thread is distributed according to the right-hand screw thread law.

8. An injection molding screw head structure according to claim 1,

the pins are protruding diamond-shaped pins.

Images