CN214773702U

CN214773702U - Hot nozzle structure and hot runner system using same

Info

Publication number: CN214773702U
Application number: CN202121062686.9U
Authority: CN
Inventors: 王桂林; 朱熠; 朱训民
Original assignee: Guangdong Frank Molding Technology Co ltd
Current assignee: Guangdong Frenk Intelligent Technology Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-11-19
Anticipated expiration: 2031-05-18

Abstract

A hot nozzle structure and a hot runner system using the same comprise a hot nozzle body and a nozzle tip, wherein the nozzle tip is connected with the bottom end of the hot nozzle body; an accommodating cavity is vertically arranged in the hot nozzle body; the outer surface of the nozzle tip is provided with at least two discharging flow channels, and the two discharging flow channels are symmetrically arranged on two sides of the nozzle tip along the central axis of the nozzle tip; a needle valve channel is arranged in the nozzle tip, the top end of the needle valve channel is communicated with the accommodating cavity, and the bottom end of the needle valve channel extends to the end face of the bottom end of the nozzle tip and is communicated with the outside; the top end of the discharge flow channel is communicated with the containing cavity, and the bottom end of the discharge flow channel is communicated with the bottom end of the needle valve channel. The utility model discloses a chew sharp surface and set up the ejection of compact runner of symmetry, make the follow the plastics that ejection of compact runner flows produce the offset, reduce plastics flow speed, and plastics can enter into the mould with slow speed, have avoided the mould can appear bright seal, defects such as gas line when the shaping, have guaranteed mould injection moulding's quality.

Description

Hot nozzle structure and hot runner system using same

Technical Field

The utility model relates to a hot runner technical field that moulds plastics especially relates to a structure and use its hot runner system are chewed to heat.

Background

Hot runners are a collection of heating assemblies used in injection molds to inject molten plastic into the cavity of the mold. Hot runner systems are generally composed of hot nozzles, manifolds, temperature control boxes, and accessories. The hot nozzle form directly determines the hot runner system selection and the mold manufacture.

However, in the prior art, when the plastic is injected into the mold, the plastic is directly and rapidly injected into the mold from the discharge runner of the hot nozzle, and the plastic is rapidly injected into the cavity of the mold, so that the surface of the mold has defects of bright prints, air marks and the like, thereby causing the quality problem of the mold.

SUMMERY OF THE UTILITY MODEL

Problem to the background art provides, the utility model aims to provide a structure and use its hot runner system are chewed to heat, through letting plastics at ejection of compact runner offset, reduce plastics flow speed, avoided the mould to produce the defect when the shaping.

To achieve the purpose, the utility model adopts the following technical proposal:

a hot nozzle structure comprises a hot nozzle body and a nozzle tip, wherein the nozzle tip is connected to the bottom end of the hot nozzle body; an accommodating cavity is vertically arranged in the hot nozzle body; the outer surface of the nozzle tip is provided with at least two discharging flow channels, and the two discharging flow channels are symmetrically arranged on two sides of the nozzle tip along the central axis of the nozzle tip; a needle valve channel is arranged in the nozzle tip, the top end of the needle valve channel is communicated with the accommodating cavity, and the bottom end of the needle valve channel extends to the end face of the bottom end of the nozzle tip and is communicated with the outside; the top end of the discharge flow channel is communicated with the containing cavity, and the bottom end of the discharge flow channel is communicated with the bottom end of the needle valve channel.

Preferably, the discharge flow channel is a strip-shaped groove structure arranged on the outer surface of the nozzle tip.

Preferably, the hot nozzle body is of a round-truncated-cone-like structure, and the diameter of the hot nozzle body is gradually reduced from top to bottom.

Preferably, the outer surface of the nozzle tip is provided with three discharge channels.

A hot-runner system, comprising: the hot nozzle structure, sprue bushing and valve needle as described above; an installation cavity is formed in the sprue bush, and the hot nozzle structure is installed in the installation cavity; the bottom of needle slide set up in the needle valve passageway.

Preferably, the outer surface of the beak tip is attached to the inner wall of the mounting cavity; a concave part is formed at the joint of the bottom end of the discharge flow channel and the bottom end of the needle valve channel; filling the recess when the valve needle slides along the needle passage to a lowermost position.

Preferably, the bottom end of the mounting cavity is provided with a pouring gate, and the pouring gate is blocked when the valve needle slides to the lowest position along the needle valve channel.

Preferably, the material conveying device further comprises a material conveying pipe, and the bottom end of the material conveying pipe is communicated with the top end of the accommodating cavity.

Compared with the prior art, the utility model discloses following beneficial effect has:

through set up symmetrical ejection of compact runner chewing the pointed surface of tip, make follow the plastics that ejection of compact runner flows produce the offset, reduce plastics flow speed, plastics can enter into the mould with slow speed, avoided the mould to appear bright seal, defects such as gas line in the shaping, guaranteed the quality of mould injection moulding spare.

Drawings

The accompanying drawings are provided to further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.

FIG. 1 is a schematic view of a hot nozzle according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a three-dimensional schematic view of a thermal nozzle structure according to an embodiment of the present invention;

FIG. 4 is an enlarged partial view of the dashed circle B in FIG. 1;

fig. 5 is a schematic structural view of a hot runner system according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like 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 explaining the present invention, and should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of technical features being indicated. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or more of the features.

As shown in fig. 1 to 5, a hot nozzle structure 10 comprises a hot nozzle body 1 and a tip 2, the tip 2 being connected to the bottom end of the hot nozzle body 1; an accommodating cavity 11 is vertically arranged in the hot nozzle body 1; the outer surface of the nozzle tip 2 is provided with at least two discharging flow channels 22, and the two discharging flow channels 22 are symmetrically arranged on two sides of the nozzle tip 2 along the central axis of the nozzle tip 2; a needle valve channel 21 is arranged in the nozzle tip 2, the top end of the needle valve channel 21 is communicated with the accommodating cavity 11, and the bottom end of the needle valve channel 21 extends to the bottom end face of the nozzle tip 2 and is communicated with the outside; the top end of the discharging flow passage 22 is communicated with the containing cavity 11, and the bottom end of the discharging flow passage is communicated with the bottom end of the needle valve passage 21. In the present embodiment, the accommodating cavity 11 is used for accommodating the injected plastic, and the plastic injected into the accommodating cavity 11 flows into the mold cavity through the discharging runner 22 for injection molding. Compared with the plastic runner of the prior art heat nozzle, the discharging runner 22 is symmetrically arranged on two sides of the outer surface of the nozzle tip 2 along the central axis of the nozzle tip 2, and the bottom ends of the discharging runners 22 are oppositely arranged. This is arranged to produce a counter-blow of the plastics material flowing out of the bottom ends of the two outlet channels 22, reducing the flow velocity thereof. Therefore, the plastic flowing out of the discharging runner 22 enters the mold at a slow speed after being flushed, so that the surface of the mold can not generate defects such as bright marks, air lines and the like during injection molding, and the quality of the mold is ensured. It is noted that the needle passage 21 inside the tip 2 is only used for mounting the valve needle 4, and plastic does not flow from the needle passage 21 into the mold. The needle 4, which is mounted in needle passage 21, has a distal end that is slidable in the needle passage 21 and, when slid down, extends through the needle passage 21 to the exterior of the beak 2. To sum up, the utility model discloses a the surface of chewing 2 sets up the ejection of compact runner 22 of symmetry, makes the follow the plastics that ejection of compact runner 22 flows out produce the offset, reduce plastics flow speed, and plastics can be with slow speed entering into the mould, have avoided the mould to appear bright defects such as seal, gas line in the shaping, have guaranteed mould injection moulding's quality.

More preferably, the discharging flow passage 22 is a strip-shaped groove structure arranged on the outer surface of the nozzle tip 2. The discharging flow channel 22 is arranged in a strip-shaped groove structure, and in the aspect of processing the tip 2, the strip-shaped groove on the outer surface of the tip 2 is easier to process than the channel inside the tip 2, so that the processing time is saved, and the processing efficiency is accelerated.

Further the body 1 is chewed to the heat is similar to the round platform structure, the diameter of body 1 is chewed to the heat reduces from last to bottom gradually. This arrangement allows the hot nozzle structure 10 to be installed in different runner systems, making the hot nozzle structure 10 more versatile, eliminating the need to produce multiple sizes of hot nozzle structures 10, and saving costs.

Preferably, three discharging flow channels 22 are arranged on the outer surface of the nozzle tip 2. In this embodiment, the outer surface of the nozzle tip 2 is preferably provided with three discharging flow channels 22, the three discharging flow channels 22 are uniformly spaced on the outer surface of the nozzle tip 2, and the bottom ends of the three discharging flow channels 22 all extend to a point, so that the plastic flowing out of the three discharging flow channels 22 can also generate a hedging effect. Still, set up three ejection of compact runner 22, under the prerequisite of guaranteeing the speed that slows down the flow of plastics, through set up three ejection of compact runner 22, increase the flow of plastics, further accelerate the speed of moulding plastics of mould to work efficiency has been accelerated.

A hot-runner system, as shown in fig. 5, comprising: the hot nozzle structure 10, the sprue bushing 3 and the valve needle 4 as described above; a mounting cavity 31 is formed in the sprue bush 3, and the hot nozzle structure 10 is mounted in the mounting cavity 31; the bottom end of the valve needle 4 is slidably arranged in the needle valve channel 21. The hot nozzle structure 10 is applied to the hot runner system through the installation cavity 31 sleeved on the sprue bush 3. The hot runner system is further provided with the valve needle 4 slidable in the needle valve channel 21. The body of the needle 4 passes through the mounting chamber 31 with its tip sliding within the needle passage 21.

Preferably, the outer surface of the beak tip 2 is attached to the inner wall of the mounting cavity 31; a concave part 23 is formed at the joint of the bottom end of the discharge flow channel 22 and the bottom end of the needle valve channel 21; when the needle 4 slides along the needle passage 21 to the lowest position, the recess 23 is filled. After the hot nozzle structure 10 is installed in the installation cavity 31, the outer surface of the nozzle tip 2 is tightly attached to the inner wall of the installation cavity 31, so that the discharge flow channel 22 is changed from an open strip-shaped groove to a closed discharge flow channel 22, and the plastic flowing into the discharge flow channel 22 from the containing cavity 11 can only flow out from the bottom end of the discharge flow channel 22. Further, the bottom end of the discharge flow path 22 is joined to the bottom end of the needle valve passage 21, so that, as shown in fig. 4, the recess 23 is formed in the bottom end surface of the tip 2 after the tip 2 is machined. Because the outer surface of the tip 2 is in contact with the inner wall of the mounting cavity 31, all the plastic flowing out of the discharge channel 22 is flushed in the recess 23 and flows out of the bottom end of the recess 23. Furthermore, when the valve needle 4 moves to the bottom end of the needle valve channel 21, the concave portion 23 is filled, the plastic cannot flow into the concave portion 23 from the discharging channel 22, the plastic only stays in the discharging channel 22, and the injection molding of the mold cannot be performed. When the bottom end of the valve needle 4 slides in the recess 23 and returns to the needle passage 21, the plastic can flow into the recess 23 and then into the mold. Therefore, the hot runner system can control the start or stop of the mold injection by controlling the movement of the valve pin 4 to fill the recess 23.

Further, the bottom end of the mounting cavity 31 is provided with a gate 32, and when the valve needle 4 slides along the needle valve channel 21 to the lowest position, the gate 32 is blocked. After flowing out of the recess 23, the plastic enters the mold cavity through the gate 32. Therefore, in this embodiment, the hot runner system can also control the start or stop of the mold injection by controlling the movement of the valve pin 4 to close the end of the valve pin 4 or open the gate 32. When the valve pin 4 selectively blocks the gate 32, the plastic stays in the recess 23; when the valve needle 4 is selected to fill the recess 23, the plastic remains in the outlet channel 22. It should be noted that while the valve needle 4 is moved in the needle passage 21, in the prior art, the valve needle 4 is installed in a central main flow passage of the nozzle tip 2, the end of the valve needle 4 extends back into a cavity connected to the main flow passage when the injection molding is started, and the valve needle 4 is shaken due to the flow of the plastic in the cavity, so that the valve needle 4 is deviated from the main flow passage, and when the valve needle 4 is moved back to the main flow passage, it needs to be aligned several times to return to the main flow passage. In the present invention, the valve needle 4 will extend back to the needle valve channel 21 and only move in the needle valve channel 21 after moving away from the gate 32, the end of the valve needle 4 will not extend back to the accommodating cavity 11. Therefore, the valve needle 4 does not shake due to the plastic flow, and can be guided by the needle valve channel 21 to quickly block the sprue 32, thereby improving the working efficiency.

Preferably, the device also comprises a material conveying pipe 5, and the bottom end of the material conveying pipe 5 is communicated with the top end of the accommodating cavity 11.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. A hot nozzle structure is characterized by comprising a hot nozzle body and a nozzle tip, wherein the nozzle tip is connected to the bottom end of the hot nozzle body;

an accommodating cavity is vertically arranged in the hot nozzle body;

the outer surface of the nozzle tip is provided with at least two discharging flow channels, and the two discharging flow channels are symmetrically arranged on two sides of the nozzle tip along the central axis of the nozzle tip;

a needle valve channel is arranged in the nozzle tip, the top end of the needle valve channel is communicated with the accommodating cavity, and the bottom end of the needle valve channel extends to the end face of the bottom end of the nozzle tip and is communicated with the outside;

the top end of the discharge flow channel is communicated with the containing cavity, and the bottom end of the discharge flow channel is communicated with the bottom end of the needle valve channel.

2. A hot nozzle structure according to claim 1, wherein the outlet flow channel is a strip groove structure provided on the outer surface of the nozzle tip.

3. The heat nozzle structure of claim 1, wherein the heat nozzle body is of a truncated cone-like structure, and the diameter of the heat nozzle body gradually decreases from top to bottom.

4. A hot nozzle structure according to claim 1, wherein the outer surface of the tip is provided with three of said outlet flow channels.

5. A hot-runner system, comprising: a hot nozzle structure, a sprue bushing and a valve pin as claimed in any one of claims 1 to 4;

an installation cavity is formed in the sprue bush, and the hot nozzle structure is installed in the installation cavity;

the bottom of needle slide set up in the needle valve passageway.

6. The hot-runner system of claim 5, wherein an outer surface of the tip abuts an inner wall of the mounting cavity;

a concave part is formed at the joint of the bottom end of the discharge flow channel and the bottom end of the needle valve channel;

filling the recess when the valve needle slides along the needle passage to a lowermost position.

7. The hot-runner system of claim 5 or 6, wherein the bottom end of the mounting cavity is provided with a gate that is blocked when the valve pin slides along the needle channel to a lowermost position.

8. The hot-runner system of claim 5, further comprising a feed conveyor tube, a bottom end of the feed conveyor tube communicating with a top end of the receiving cavity.