CN111775411A

CN111775411A - Hot nozzle assembly and hot runner system

Info

Publication number: CN111775411A
Application number: CN202010781654.8A
Authority: CN
Inventors: 李象烈
Original assignee: Yudo Suzhou Hot Runner Systems Co Ltd
Current assignee: Yudo Suzhou Hot Runner Systems Co Ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2020-10-16

Abstract

The invention discloses a hot nozzle assembly for a mold, which comprises a hot nozzle extending along a longitudinal axis, a sprue bush fixedly arranged on the inner side of the hot nozzle, wherein the hot nozzle is provided with a glue inlet, the sprue bush is provided with a glue outlet, the glue inlet is communicated with the glue outlet, the hot nozzle assembly further comprises a movable core connected to the sprue bush, the sprue bush is provided with at least two branch channels communicated with the glue inlet and the glue outlet, the movable core is provided with an upper end part facing the glue inlet, and the movable core can be moved upwards or downwards in an adjustable manner in the extending direction of the longitudinal axis so as to adjust a gap between the upper end part and the hot nozzle. The hot nozzle assembly and the hot runner system provided by the invention not only can conveniently adjust the flow of plastic, but also have simple structure and lower cost.

Description

Hot nozzle assembly and hot runner system

Technical Field

The invention relates to the field of hot runner molds, in particular to a hot nozzle assembly and a hot runner system.

Background

At present, the injection mold generally adopted in the injection molding industry is a hot runner injection mold, and compared with a common mold, the quality of a plastic product injected by a hot runner system is higher, and the hot runner system has the advantages of saving raw materials, improving the production efficiency, improving the automation degree and the like.

The hot nozzle component comprises a nozzle tip, a valve needle is movably arranged on the nozzle tip through piston driving, the valve needle moves in the direction of a longitudinal axis through the piston driving to open or close the pouring gate, the effective control on the plastic flow cannot be realized, and the structure is complex and the cost is high. In addition, the valve needle extends very long in the lengthwise direction, and after the long-term use of the slender valve needle, because of thermal expansion and plastic pressure, the slender valve needle is often deviated from the ideal position of the center, so when the valve needle is closed, the valve needle can impact the sprue bush or the die core, the sprue bush or the die core is damaged, and the service life is greatly reduced.

Disclosure of Invention

The invention aims to provide a hot nozzle assembly and a hot runner system, which can conveniently adjust the flow of plastic, and have simple structure and lower cost.

In order to achieve one of the above objects, according to one embodiment of the present invention, there is provided a hot nozzle assembly for a mold, the hot nozzle assembly including a hot nozzle extending along a longitudinal axis, a sprue bush fixedly disposed inside the hot nozzle, the hot nozzle having a glue inlet, the sprue bush having a glue outlet, the glue inlet communicating with the glue outlet, wherein,

the hot nozzle assembly further comprises a movable core connected to the sprue bush, at least two branch runners communicated with the glue inlet and the glue outlet are arranged on the sprue bush, the movable core is provided with an upper end portion facing the glue inlet, and the movable core can move upwards or downwards in an adjustable mode in the extending direction of the longitudinal axis so as to adjust a gap between the upper end portion and the hot nozzle.

As a further improvement of an embodiment of the present invention, the movable core is screwed to the sprue bush.

As a further improvement of an embodiment of the present invention, the hot nozzle has an upper runner, a lower fitting portion fixedly fitted with the sprue bush, and an inclined portion located between the upper runner and the lower fitting portion, and the sub-runner has an upper inlet facing the inclined portion and a lower outlet communicating with the glue outlet.

As a further improvement of an embodiment of the present invention, an outer diameter of the movable core is not smaller than an inner diameter of the upper flow passage.

As a further improvement of an embodiment of the present invention, the upper end portion has an inclined surface parallel to the inclined portion, and when the movable core is adjustably moved upward or downward in the extending direction of the longitudinal axis, a gap between the inclined surface and the inclined portion is adjustable to adjust the flow rate of the plastic.

As a further improvement of an embodiment of the present invention, the sprue bush has an upper connecting portion connected to the movable core, a lower portion forming the glue outlet, and a middle portion connecting between the upper connecting portion and the lower portion, a gap is provided between each of the lower portion and the middle portion and the movable core in a direction perpendicular to the longitudinal axis, and the lower outlet is located in the middle portion.

As a further development of an embodiment of the invention, the at least two runners are evenly distributed over the sprue bush with respect to the longitudinal axis.

As a further improvement of an embodiment of the invention, the extension direction of the sub-runners is parallel to the longitudinal axis.

In order to achieve one of the above objects, an embodiment of the present invention further provides a hot runner system, which includes a mold and a hot nozzle assembly provided to the mold,

the hot nozzle assembly comprises a hot nozzle extending along a longitudinal axis and a sprue bush fixedly arranged on the inner side of the hot nozzle, the hot nozzle is provided with a glue inlet, the sprue bush is provided with a glue outlet, and the glue inlet is communicated with the glue outlet,

As a further improvement of an embodiment of the present invention, the movable core is in threaded connection with the sprue bush, and the movable core is provided with at least two sub-runners, and the sub-runners are communicated with the glue inlet and the glue outlet.

Compared with the prior art, the invention has the beneficial effects that: when the plastic flow needs to be adjusted, the movable core is adjusted to move upwards or downwards in the extending direction of the longitudinal axis, so that the gap between the upper end part and the hot nozzle is reduced or increased, and the plastic flow is adjusted. And the activity core has the upper end towards going into the jiao kou, that is to say, the activity core is kept away from into the jiao kou, and consequently the length of activity core on the extending direction of longitudinal axis is less, and activity core rigid connection is in the runner cover, need not set up the actuating mechanism who drives the motion of activity core in addition, therefore simple structure, cost are very low, and also very convenient flow of adjusting the plastic.

Drawings

FIG. 1 is a schematic longitudinal sectional view of a hot runner system according to an embodiment of the present invention;

FIG. 2 is a schematic longitudinal cross-sectional view of the hot tip assembly of the hot runner system of FIG. 1 with the movable core adjusted to a lower position for greater plastic flow;

FIG. 3 is an enlarged partial schematic view at A of FIG. 1;

FIG. 4 is a schematic longitudinal cross-sectional view of the hot nozzle assembly of FIG. 2, with the movable core adjusted upward and the plastic flow reduced relative to FIG. 2;

FIG. 5 is a schematic longitudinal cross-sectional view of the hot nozzle assembly of FIG. 4, with the movable core further adjusted upward and with a minimum plastic flow relative to FIG. 4.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Terms such as "upper," "above," "lower," "below," and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 5, the embodiment of the present invention provides a hot runner system, which includes a mold, a hot nozzle assembly 10 disposed in the mold, a temperature control box, and a hot runner at least formed in the hot nozzle assembly 10, wherein plastic in a molten state is sequentially poured into a cavity of the mold through the hot nozzle assembly 10 by means of heating and temperature controlling the plastic injection material, so as to avoid forming solidified materials of the pouring system.

The mold includes an upper cover plate 14, a diverter plate 16 and a cavity plate 17, the hot tip assembly 10 is partially disposed on the diverter plate 16, and the hot tip assembly 10 is partially disposed on the cavity plate 17. The hot runner system includes a plurality of hot nozzle assemblies 10 provided to the mold, and in the preferred embodiment, the hot runner system includes two hot nozzle assemblies 10 provided to the mold. Of course, more than two hot nozzle assemblies 10 may be provided according to specific requirements, and the flow distribution plate 16 is provided with flow distribution plate flow passages 18 communicated with the two hot nozzle assemblies 10.

Specifically, the hot nozzle assembly 10 includes a hot nozzle 20 extending along a longitudinal axis X and a sprue bushing 21 fixedly disposed inside the hot nozzle 20. The hot nozzle 20 is provided with a glue inlet 22, the sprue bush 21 is provided with a glue outlet 24, and the glue inlet 22 is communicated with the glue outlet 24. The glue inlet 22 is connected to the splitter plate runner 18 for the molten plastic to flow into. The glue outlet 24 is adjacent the underside of the cavity plate 17 to allow the plastic to be poured into the cavity of the mold.

The hot nozzle assembly 10 further includes a removable core 30 attached to the sprue bushing 21, with the sprue bushing 21 having at least two runners 34 connecting the glue inlet 22 and the glue outlet 24. The movable core 30 has an upper end 32 facing the glue inlet 22, the movable core 30 being adjustably movable upwards or downwards in the extension direction of the longitudinal axis X to adjust the gap between the upper end 32 and the hot nozzle 20.

When the plastic flow rate needs to be adjusted, the movable core 30 is moved upward or downward in the extending direction of the longitudinal axis X by adjusting the movable core 30, so that the gap between the upper end portion 32 and the hot nozzle 20 is reduced or increased to adjust the plastic flow rate. The movable core 30 has an upper end 32 facing the glue inlet 22, that is, the movable core 30 is far away from the glue inlet 22, so that the length of the movable core 30 in the extending direction of the longitudinal axis X is small, the movable core 30 is rigidly connected to the sprue bush 21, and a driving mechanism for driving the movable core 30 to move is not required to be additionally arranged, so that the structure is simple, the cost is very low, and the flow rate of the plastic is very convenient to adjust.

The nozzle 20 has an upper flow passage 26, a lower fitting 28 fixedly fitted to the sprue bush 21, an inclined portion 36 between the upper flow passage 26 and the lower fitting 28, and a branch flow passage 34 having an upper inlet 38 facing the inclined portion 36 and a lower outlet 40 communicating with the glue outlet 24.

At least two runners 34 are evenly distributed about the longitudinal axis X in the sprue bush 21. Preferably, the extension direction of the branch channels 34 is parallel to the longitudinal axis X. When the movable core 30 is adjusted upward or downward, the gap between the upper end portion 32 and the inclined portion 36 becomes smaller or larger, thereby adjusting the flow rate of the plastic. The inclined portion 36 is a tapered surface, and an included angle formed between the inclined portion 36 and the inner wall of the upper flow path 26 is an obtuse angle. Preferably, the angle formed by the inclined portion 36 and the inner wall of the upper flow path 26 is 145 degrees.

Further, the movable core 30 is screwed into the sprue bush 21. In a transverse direction perpendicular to the longitudinal axis X, part of the sprue bush 21 is located between the hot nozzle 20 and the movable core 30. In the direction of extension of the longitudinal axis X, part of the sprue bush 21 protrudes from the hot nozzle 20. Further, an internal thread portion is provided on a part of the inner wall of the sprue bush 21, and an external thread portion adapted to the internal thread portion is provided on the outer periphery of the movable core 30. When the movable core 30 is adjusted, the movable core 30 is completely away from the upper flow passage 26 or is partially located in the upper flow passage 26. When the movable core 30 is rotated to move in a direction gradually away from the glue inlet 22, the flow rate of the plastic gradually increases as the gap between the upper end portion 32 and the hot nozzle 20 gradually increases, until the flow rate of the plastic is maximum, the movable core 30 completely moves away from the upper flow channel 26; when the movable core 30 is rotated to move toward the direction gradually approaching the glue inlet 22, the flow rate of the plastic gradually decreases as the gap between the upper end portion 32 and the hot nozzle 20 gradually decreases, so that when the flow rate of the plastic is minimum or completely zero, a small portion of the movable core 30 is located in the upper flow passage 26. And when the flow rate of the plastic is maximum, the movable core 30 still does not protrude out of the hot nozzle 20. The length of the movable core 30 is very small and it is not necessary to additionally provide a driving mechanism for driving the movable core 30.

Preferably, the outer diameter of the movable core 30 is not smaller than the inner diameter of the upper flow path 26. In addition, in the preferred embodiment, the movable core 30 is always rigidly connected to the sprue bush 21, preventing deformation and deflection of the movable core 30, resulting in a more stable and reliable hot nozzle assembly 10 with a longer service life.

Further, the upper end portion 32 has a slope 46 parallel to the inclined portion 36 and a spherical surface 47 located at the tip of the upper end portion 32 and connected to the slope 46. Preferably, the upper inlet 38 is disposed closer to the inclined portion, so that no plastic builds up between the sprue bushing 21 and the hot nozzle 20. When the movable core 30 is adjustably moved up or down in the direction of extension of the longitudinal axis X, the gap between the inclined surface 46 and the inclined portion 36 can be adjusted to adjust the flow rate through the plastic. When the movable core 30 is adjusted to the point where the inclined portion 36 engages the inclined surface 46, the flow of plastic is zero, i.e., the glue is completely shut off. The inclined portion 36 is in surface contact with the inclined surface 46, so that the plastic closing effect is better.

The sprue bush 21 has an upper connecting portion 48 connected to the movable core 30, a lower portion 50 forming the glue outlet 24, and an intermediate portion 52 connecting the upper connecting portion 48 and the lower portion 50, the lower portion 50 and the intermediate portion 52 each having a clearance from the movable core 30 in a direction perpendicular to the longitudinal axis X, and the lower outlet 40 being located in the intermediate portion 52. The female screw portion is provided in the upper connecting portion 48. The middle portion 52 is curved and concave relative to the movable core 30, so that the gap between the movable core 30 and the middle portion 52 is larger, and the plastic can flow out more conveniently.

The movable core 30 has a lower end 42 opposite the upper end 32, the lower end 42 facing the glue outlet 24. The circumferential dimension of the lower end portion 42 from the external thread portion of the movable core 30 to the end of the lower end portion 42 is gradually reduced, so that the gap between the lower end portion 42 and the middle portion of the movable core 30 is further increased, and the plastic can flow out more conveniently. Further, the lower end portion 42 is provided with an adjusting portion 44 that is engaged with or disengaged from an externally-connected adjusting tool (not shown). When it is desired to adjust the movable core 30 upward or downward along the extension direction of the longitudinal axis X, the external adjusting tool is inserted into the sprue bush 21 from the glue outlet 24, and the external adjusting tool is coupled to the adjusting portion 44, so as to rotate the movable core 30 upward or downward. When the adjustment is completed, the adjustment tool is disengaged from the adjustment portion 44 and removed.

Preferably, the adjustment portion 44 is provided as an inner hexagonal. Of course, the adjusting portion 44 can be configured as an outer hexagon or other structures, so long as it can be adapted to an adjusting tool to rotate the movable core 30. In the preferred embodiment, the adjusting portion 44 is a hexagon socket, so that the movable core 30 can be adjusted by using a common hexagon wrench, and the adjusting portion 44 is disposed on the lower end portion 42, so that the adjusting portion 44 is closer to the glue outlet 24, and the movable core 30 can be adjusted more conveniently.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A hot nozzle assembly for a mold, the hot nozzle assembly comprising a hot nozzle extending along a longitudinal axis, a sprue bushing fixedly disposed inside the hot nozzle, the hot nozzle having a glue inlet, the sprue bushing having a glue outlet, the glue inlet being in communication with the glue outlet,

2. The hot nozzle assembly as claimed in claim 1, wherein said movable core is threadably connected to said sprue bushing.

3. The nozzle assembly of claim 1, wherein said nozzle has an upper flow passage, a lower mating portion fixedly mated with said sprue bushing, an angled portion between said upper flow passage and said lower mating portion, said flow passage having an upper inlet facing said angled portion and a lower outlet in communication with said glue outlet.

4. The hot nozzle assembly of claim 3, wherein an outer diameter of the movable core is not less than an inner diameter of the upper flow passage.

5. The hot nozzle assembly of claim 3, wherein the upper end portion has a ramp surface parallel to the inclined portion, and wherein a gap between the ramp surface and the inclined portion is adjustable to adjust a flow rate through the plastic when the movable core is adjustably moved upward or downward in a direction of extension of the longitudinal axis.

6. The hot nozzle assembly as claimed in claim 3, wherein said sprue bushing has an upper connecting portion connected to said movable core, a lower portion forming said glue outlet, and an intermediate portion connecting between said upper and lower portions, said lower and intermediate portions each having a gap with said movable core in a direction perpendicular to said longitudinal axis, said lower outlet being located in said intermediate portion.

7. The hot nozzle assembly as claimed in claim 1, wherein said at least two runners are evenly distributed about said longitudinal axis through said sprue bushing.

8. The hot nozzle assembly of claim 1, wherein said runners extend in a direction parallel to said longitudinal axis.

9. A hot runner system, the hot runner system includes a mold and a hot nozzle assembly arranged on the mold, the hot nozzle assembly includes a hot nozzle extending along a longitudinal axis, a sprue bush fixedly arranged on the inner side of the hot nozzle, the hot nozzle has a glue inlet, the sprue bush has a glue outlet, the glue inlet is communicated with the glue outlet, the hot runner system is characterized in that,

10. The hot-runner system of claim 9, wherein the movable core is threadably connected to the sprue bushing, and wherein the movable core is provided with at least two runners, the runners being in communication with the glue inlet and the glue outlet.