CN219114679U - Hot runner system and main inlet nozzle structure thereof - Google Patents

Abstract

The utility model discloses a hot runner system and a main inlet nozzle structure thereof, wherein the main inlet nozzle structure comprises a main inlet nozzle body, a first inlet pipe and a first outlet pipe, and a first channel communicated with the first inlet pipe and the first outlet pipe; the valve assembly is arranged at the first inlet and comprises a valve body and a valve core movably arranged in the second channel, the valve body is provided with the second inlet, a second outlet and the second channel, the second outlet is communicated with the first inlet, the first channel is communicated with the second channel through the second outlet and the first inlet, the valve core can be switched between a first position and a second position under the action of pressure difference, and when the valve core is in the first position, the valve core seals a passage between the second inlet and the second channel; in the second position, a passageway between the second inlet and the second passageway is opened. The valve core is self-closed, external force or mechanical force is not needed, self-closing failure or incomplete flash generation caused by external force or mechanical force faults in the production process is avoided, and the valve core is simple in structure, strong in practicability and reliable.

Description

Hot runner system and main inlet nozzle structure thereof

Technical Field

The utility model relates to the technical field of hot runners, in particular to a hot runner system and a main inlet nozzle structure thereof.

Background

The structure of the hot runner system is uniform, although it may vary widely due to differences in plastic variety and performance, shape and structure type of plastic products, etc. The hot runner system mainly comprises a splitter plate, a main inlet nozzle, a nozzle and other parts; if the hot runner system is a needle valve nozzle, the hot runner system also includes parts such as a valve needle and a valve needle driver. The main inlet nozzle is a feeding end of the hot runner system and is in contact fit with the gun nozzle of the injection molding machine. In the production process, molten resin is ejected from a gun nozzle of an injection molding machine and enters a hot runner system through a main inlet nozzle.

In modern production, factories replace dies according to actual production needs. Some of the molds are removed from the injection molding machine just after completion. When the gun nozzle of the injection molding machine is separated from the main inlet nozzle of the hot runner system, the external pressure applied to the main inlet nozzle suddenly disappears, the resin pressure in the hot runner is released, and the molten resin is driven to flow out from the main inlet nozzle. During the transfer of the mold, the resin flowing out may cause safety accidents and environmental pollution. Therefore, it is highly desirable to provide a hot runner system and a main inlet structure thereof to solve the above-mentioned problems.

Disclosure of Invention

In view of the above technical problems, an object of the present utility model is to provide a hot runner system and a main inlet structure thereof.

The technical scheme of the utility model is as follows:

an object of the present utility model is to provide a main nozzle structure of a hot runner system, comprising:

the main inlet nozzle body is provided with a first inlet, a first outlet and a first channel communicated with the first inlet and the first outlet;

the valve assembly is arranged at the first inlet of the main inlet nozzle body and comprises a valve body and a valve core movably arranged in the valve body, the valve body is provided with a second inlet, a second outlet and a second channel, the second outlet is communicated with the first inlet, the first channel is communicated with the second channel through the first inlet and the second outlet, the valve core can be switched between a first position and a second position under the action of pressure difference, and the valve core seals a passage between the second inlet and the second channel when in the first position; in a second position, a passageway between the second inlet and the second passageway is opened.

It is an object of the present utility model to provide a hot runner system comprising the main inlet structure described above.

Compared with the prior art, the utility model has the advantages that:

according to the main inlet nozzle structure of the hot runner system, the valve component is arranged at the inlet position of the main inlet nozzle, the valve core is opened by using the resin pressure of the injection molding machine, so that molten resin enters the main inlet nozzle and then enters the hot runner, after injection molding is finished, the pressure on the valve core is relieved by the injection molding machine, the stress of the resin in the hot runner acts on the valve core in a reaction mode, the valve core is self-closed, external force or mechanical force is not needed, self-closing failure or incomplete flash caused by external force or mechanical force faults in the production process is avoided, and the main inlet nozzle structure is simple in structure, high in practicability and reliable. The problems of safety accidents and environmental pollution caused by overflow of the resin of the main inlet nozzle in the prior art after the resin is separated from the gun nozzle of the injection molding machine are solved.

Drawings

The utility model is further described below with reference to the accompanying drawings and examples:

FIG. 1 is a perspective schematic view of a main inlet structure of a hot runner system according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the main nozzle structure of the hot runner system of FIG. 1;

FIG. 3 is a schematic view in section A-A of the main nozzle structure of the hot runner system of FIG. 2;

FIG. 4 is a schematic view of the structure of a valve body of the main nozzle structure of the hot runner system of FIG. 3;

fig. 5 is a schematic structural view of a valve core of a main inlet structure of the hot runner system in fig. 3.

Wherein: 1. a main inlet body; 11. a first channel; 2. a valve assembly; 21. a valve body; 210. a second channel; 211. a second inlet; 212. a second outlet; 213. a blocking wall; 22. a valve core; 221. a boss; 23. a valve seat; 3. a heating member; 31. a heating member; 32. a fixing member; 4. a diverter plate; 41. a main flow passage; 42. and a flow dividing channel.

Detailed Description

The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

Examples:

referring to fig. 1 to 5, a main inlet structure of a hot runner system according to an embodiment of the present utility model includes a main inlet body 1 and a valve assembly 2. The main inlet body 1 is a hollow cylinder, specifically, the main inlet body 1 has a first inlet, a first outlet and a first channel 11, the first channel 11 is disposed between the first inlet and the second outlet 212 to communicate the first inlet and the first outlet, and the first channel 11 is a straight channel. The valve assembly 2 is disposed at the first inlet position, the valve assembly 2 includes a valve body 21 and a valve core 22, the valve body 21 has a second inlet 211, a second outlet 212 and a second channel 210, the second channel 210 is disposed between the second inlet 211 and the second outlet 212 to communicate the second inlet 211 and the second outlet 212, and the second channel 210 is also a straight channel. The second channel 210 communicates with the first channel 11 through a second outlet 212 and a first inlet. The spool 22 is movably disposed in the second passage 210 along the axial direction of the second passage 210. Specifically, the spool 22 is switchable between a first position in which the spool 22 closes the passage of the second inlet 211 and the second passage 210, and a second position in which the passage between the second inlet 211 and the second passage 210 is opened. The manner of connection and the principle of operation of the valve body 21 and the valve core 22 are similar to those of the conventional valve assembly 2, and will not be described, but will be known to those skilled in the art. More specifically, the second inlet 211 may be connected to the nozzle of the injection molding machine, and after the resin is injected from the nozzle of the injection molding machine, the molten resin has a larger pressure, and the valve core 22 moves toward the second outlet 212 under the pressure of the resin, so that the second inlet 211 is communicated with the second channel 210, and the resin enters the first channel 11 from the second outlet 212 through the second channel 210. After injection molding is completed, the gun nozzle of the injection molding machine leaves the second inlet 211, at this time, the external acting force borne by the valve core 22 disappears, at this time, the valve core 22 can be reversely acted due to the resin stress in the hot runner, so that the valve core 22 moves outwards until the valve core 22 cuts off the communication between the second inlet 211 and the second channel 210, at this time, the second inlet 211 is closed, the resin in the hot runner cannot overflow from the main inlet body 1, and self-closing of the main inlet is realized. According to the embodiment of the utility model, the main inlet nozzle of the hot runner is improved, the valve assembly 2 is arranged at the inlet position of the main inlet nozzle, the valve core 22 is opened by using the resin pressure of the injection molding machine, so that molten resin enters the main inlet nozzle and then enters the hot runner, after injection molding is finished, the valve core 22 is pressurized by the injection molding machine, the stress of the resin in the hot runner is reacted with the valve core 22, the valve core 22 is self-closed, external force or mechanical force is not needed, self-closing failure or incomplete flash caused by external force or mechanical force faults in the production process is avoided, and the injection molding machine has a simple structure and strong practicability and is reliable. The problems of safety accidents and environmental pollution caused by overflow of the resin of the main inlet nozzle in the prior art after the resin is separated from the gun nozzle of the injection molding machine are solved.

According to some preferred embodiments of the present utility model, as shown in fig. 4, the second inlet 211 has an inner diameter smaller than that of the second passage 210 to form a blocking wall 213 therebetween. The outer wall surface of the spool 22 is projected and extended radially outward to form a boss 221. In the first position, the boss 221 is fitted with the blocking wall 213 to shut off communication between the second inlet 211 and the second passage 210; in the second position, the boss 221 is separated from the blocking wall 213, leaving a gap for the second inlet 211 to communicate with the second channel 210 to form a passageway for the second inlet 211 to communicate with the second channel 210. Fig. 3 shows the valve core 22 in the first position, and when the valve core 22 is in the second position, the boss 221 is located below the blocking wall 213 and has a certain distance, and the resin can enter the second channel 210 through the gap between the second inlet 211 and the second channel 210, that is, the second inlet 211 is opened. Preferably, as shown in fig. 4, the surface of the boss 221, which is attached to the blocking wall 213, that is, the outer edge of the upper surface of the boss 221 as shown in fig. 4 is chamfered, and correspondingly, as shown in fig. 5, the blocking wall 213 is chamfered. As an alternative embodiment, the outer edge of the surface, on which the boss 221 is attached to the blocking wall 213, is rounded, and the blocking wall 213 is correspondingly rounded.

According to some preferred embodiments of the present utility model, as shown in fig. 4, the valve assembly 2 further includes a valve seat 23, and an end of the valve core 22 extending out of the second channel 210 is connected to the valve seat 23, and the second outlet 212 is opened in the valve seat 23. The valve seat 23 serves as a base body in which the valve element 22 is movably mounted in the valve body 21. As an alternative embodiment, the valve core 22 may be movably connected directly to the valve body 21, that is, the valve body 21 may be used as a mounting base of the valve core 22, and may be implemented without the valve seat 23.

According to some preferred embodiments of the present utility model, as shown in fig. 4, the heating member 3 is further included, and the heating member 3 is wrapped around the periphery of the first inlet of the main nozzle body 1. The heating means 3 are provided in order to keep the main inlet in a constant temperature state so that the vertical continuation of the inlet into the hot runner system is maintained in a molten state. Preferably, the heating member 3 includes a heating member 31 and a fixing member 32 for fixing the heating member 31 to the main nozzle body 1. Further preferably, as shown in fig. 2, the heating element 31 is C-shaped, and the heating element 31 may be a heating plate or the like having a heating element such as a heating resistance wire built in a conventional manner in the field. Preferably, the securing member 32 is a clip. The clamp is adopted, so that the heating element 31 is convenient to replace and maintain.

According to some preferred embodiments of the present utility model, as shown in fig. 1 to 3, a flow dividing plate 4 is further included, which is connected at the first outlet position and has therein a main flow channel 41 communicating with the first channel 11 and at least two flow dividing channels 42 communicating with the main flow channel 41. That is to say a modular assembly with a main nozzle body 1 and a hot runner manifold 4.

The embodiment of the utility model also provides a hot runner system, which comprises the main inlet nozzle structure of the embodiment. The main inlet structure of the above embodiment has at least the beneficial effects of the main inlet structure, and detailed descriptions thereof are omitted.

It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.

Claims (10)

1. A primary nozzle structure of a hot runner system, comprising:

the main inlet nozzle body is provided with a first inlet, a first outlet and a first channel communicated with the first inlet and the first outlet;

the valve assembly is arranged at the first inlet of the main inlet nozzle body and comprises a valve body and a valve core movably arranged in the valve body, the valve body is provided with a second inlet, a second outlet and a second channel, the second outlet is communicated with the first inlet, the first channel is communicated with the second channel through the first inlet and the second outlet, the valve core can be switched between a first position and a second position under the action of pressure difference, and the valve core seals a passage between the second inlet and the second channel when in the first position; in a second position, a passageway between the second inlet and the second passageway is opened.

2. The primary nozzle structure of a hot runner system as described in claim 1 wherein said second inlet has an inner diameter less than an inner diameter of said second passageway to form a barrier therebetween;

the outer wall surface of the valve core protrudes outwards in the radial direction to form a boss;

in the first position, the boss is attached to the blocking wall to cut off communication between the second inlet and the second channel; in the second position, the boss is separated from the blocking wall, leaving a gap for the second inlet to communicate with the second channel.

3. A main nozzle structure of a hot runner system according to claim 2, wherein the outer edge of the face of the boss that is attached to the blocking wall is chamfered or rounded.

4. The primary inlet structure of a hot runner system of claim 1, wherein said valve assembly further comprises a valve seat, an end of said valve cartridge extending out of said second passageway being connected to said valve seat, said second outlet opening into said valve seat.

5. The primary nozzle structure of a hot runner system of claim 1, further comprising a heating member wrapped around a periphery of said first inlet of said primary nozzle body.

6. The primary nozzle structure of a hot runner system of claim 5, wherein said heating element comprises a heating element and a securing element for securing said heating element to said primary nozzle body.

7. The primary nozzle structure of a hot runner system as described in claim 6 wherein said heating element is C-shaped.

8. The primary nozzle structure of a hot runner system of claim 6, wherein said fastener is a clip.

9. The primary inlet structure of a hot runner system according to any one of claims 1-8, further comprising a manifold connected at said first outlet location and having a primary runner therein in communication with said first passageway and at least two sub-runners in communication with said primary runner.

10. A hot runner system comprising the primary nozzle structure of any one of claims 1-9.

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