Hot nozzle assembly and hot runner system

Abstract

The present invention discloses a hot nozzle assembly for a mold, the hot nozzle assembly includes a hot nozzle extending along a longitudinal axis, a sprue sleeve fixedly arranged inside the hot nozzle, the hot nozzle has a glue inlet, the sprue sleeve has a glue outlet, the glue inlet and the glue outlet are connected, wherein the hot nozzle assembly also includes a movable core connected to the sprue sleeve, the sprue sleeve is provided with at least two branch channels connecting the glue inlet and the glue outlet, the movable core has an upper end facing the glue inlet, and the movable core can be adjusted to move upward or downward in the extension direction of the longitudinal axis to adjust the gap between the upper end and the hot nozzle. The hot nozzle assembly and hot runner system provided by the present invention can not only conveniently adjust the flow rate of plastic, but also have a simple structure and low cost.

Description

Technical Field

[0001] The invention relates to the field of hot runner molds, and in particular to a hot nozzle assembly and a hot runner system. Background Art

[0002] At present, the injection mold commonly used in the injection molding industry is the hot runner injection mold. Compared with ordinary molds, the plastic products injected by the hot runner system are of higher quality, and the hot runner system has the advantages of saving raw materials, improving production efficiency, and a high degree of automation.

[0003] The hot nozzle assembly includes a nozzle tip, a valve needle movably arranged at the nozzle tip by a piston drive, and the valve needle is driven by the piston to move in the longitudinal axis direction to open or close the gate, which cannot effectively control the plastic flow, and has a complex structure and high cost. In addition, the valve needle extends very long in the longitudinal direction. After long-term use, the slender valve needle tends to deviate from the ideal center position due to thermal expansion and plastic pressure. Therefore, when the valve needle is about to close, the valve needle will hit the gate sleeve or mold core, causing damage to the gate sleeve or mold core, greatly reducing the service life. Summary of the invention

[0004] The object of the present invention is to provide a hot nozzle assembly and a hot runner system, which can not only conveniently adjust the flow rate of plastic but also have a simple structure and low cost.

[0005] To achieve one of the above-mentioned purposes, an embodiment of the present invention provides a hot nozzle assembly for a mold, the hot nozzle assembly comprising a hot nozzle extending along a longitudinal axis, a sprue sleeve fixedly arranged inside the hot nozzle, the hot nozzle having a glue inlet, the sprue sleeve having a glue outlet, the glue inlet and the glue outlet are connected, wherein:

[0006] The hot nozzle assembly also includes a movable core connected to the sprue sleeve, the sprue sleeve is provided with at least two branch channels connecting a glue inlet and a glue outlet, the movable core has an upper end facing the glue inlet, and the movable core can be adjusted to move upward or downward in the extension direction of the longitudinal axis to adjust the gap between the upper end and the hot nozzle.

[0007] As a further improvement of an embodiment of the present invention, the movable core is threadedly connected to the gate bushing.

[0008] As a further improvement of one embodiment of the present invention, the hot nozzle has an upper runner, a lower matching portion fixedly connected to the gate sleeve, and an inclined portion located between the upper runner and the lower matching portion, and the branch channel has an upper inlet facing the inclined portion and a lower outlet connected to the glue outlet.

[0009] As a further improvement of an embodiment of the present invention, the outer diameter of the movable core is not less than the inner diameter of the upper flow channel.

[0010] As a further improvement of one embodiment of the present invention, the upper end portion has an inclined surface parallel to the inclined portion, and when the movable core is adjusted to move upward or downward in the extension direction of the longitudinal axis, the gap between the inclined surface and the inclined portion can be adjusted to adjust the flow rate of the plastic.

[0011] As a further improvement of one embodiment of the present invention, the gate sleeve has an upper connecting part connected to the movable core, a lower part forming the glue outlet, and a middle part connecting the upper connecting part and the lower part. In the direction perpendicular to the longitudinal axis, there is a certain gap between the lower part and the middle part and the movable core, and the lower outlet is located in the middle part.

[0012] As a further improvement of an embodiment of the present invention, the at least two branch channels are evenly distributed on the gate bushing about the longitudinal axis.

[0013] As a further improvement of an embodiment of the present invention, an extension direction of the branch channel is parallel to the longitudinal axis.

[0014] To achieve one of the above-mentioned purposes, an embodiment of the present invention further provides a hot runner system, the hot runner system comprising a mold and a hot nozzle assembly provided on the mold,

[0015] The hot nozzle assembly comprises a hot nozzle extending along the longitudinal axis, and a sprue sleeve fixedly arranged inside the hot nozzle, wherein the hot nozzle has a glue inlet, and the sprue sleeve has a glue outlet, and the glue inlet and the glue outlet are connected, and the characteristics are as follows:

[0016] The hot nozzle assembly also includes a movable core connected to the sprue sleeve, the sprue sleeve is provided with at least two branch channels connecting a glue inlet and a glue outlet, the movable core has an upper end facing the glue inlet, and the movable core can be adjusted to move upward or downward in the extension direction of the longitudinal axis to adjust the gap between the upper end and the hot nozzle.

[0017] Compared with the prior art, the beneficial effect of the present invention is that when the flow of plastic needs to be adjusted, the movable core is adjusted to move upward or downward in the extension direction of the longitudinal axis, so that the gap between the upper end and the hot nozzle is reduced or increased to adjust the flow of plastic. The movable core has an upper end facing the glue inlet, that is, the movable core is far away from the glue inlet, so the length of the movable core in the extension direction of the longitudinal axis is small, and the movable core is rigidly connected to the sprue bushing, and there is no need to set up a driving mechanism for driving the movable core to move, so the structure is simple, the cost is very low, and it is also very convenient to adjust the flow of plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the longitudinal section structure of the hot runner system in a specific embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the longitudinal section structure of the hot nozzle assembly in the medium hot runner system. At this time, the movable core is adjusted to a lower position, and the plastic flow rate is larger;

[0020] Figure 3 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0021] Figure 4 yes Figure 2 Schematic diagram of the longitudinal section structure of the middle hot nozzle assembly, relative to Figure 2 , the movable core is adjusted upward, and the plastic flow rate becomes smaller;

[0022] Figure 5 yes Figure 4 Schematic diagram of the longitudinal section structure of the middle hot nozzle assembly, relative to Figure 4 , the movable core continues to be adjusted upward and the plastic flow is minimal. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0024] In various drawings of the present application, for the convenience of illustration, some sizes of structures or parts are exaggerated relative to other structures or parts, and thus, are only used to illustrate the basic structure of the subject matter of the present application.

[0025] As used herein, terms indicating spatial relative positions such as "upper," "above," "lower," and "below" are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms of spatial relative position may be intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the figure is turned over, the units described as being "below" or "beneath" other units or features will be located "above" the other units or features. Thus, the exemplary term "below" can encompass both the above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein interpreted accordingly.

[0026] like Figures 1 to 5As shown, a specific embodiment of the present invention provides a hot runner system, which includes a mold, a hot nozzle assembly 10 arranged in the mold, a temperature control box and a hot runner formed in at least the hot nozzle assembly 10. By heating and temperature controlling the injection material, the molten plastic is sequentially poured into the mold cavity after passing through the hot nozzle assembly 10 to avoid the formation of agglomerate in the pouring system.

[0027] The mold includes an upper cover plate 14, a manifold plate 16 and a cavity plate 17. A portion of the hot nozzle assembly 10 is disposed on the manifold plate 16, and a portion of the hot nozzle assembly 10 is disposed on the cavity plate 17. The hot runner system includes a plurality of hot nozzle assemblies 10 disposed on the mold. In this preferred embodiment, the hot runner system includes two hot nozzle assemblies 10 disposed on the mold. Of course, more than two hot nozzle assemblies 10 may be provided according to specific needs, and a manifold flow channel 18 connected to the two hot nozzle assemblies 10 may be provided on the manifold plate 16.

[0028] Specifically, the hot nozzle assembly 10 includes a hot nozzle 20 extending along the longitudinal axis X and a sprue sleeve 21 fixedly arranged inside the hot nozzle 20. The hot nozzle 20 has a glue inlet 22, and the sprue sleeve 21 has a glue outlet 24, and the glue inlet 22 and the glue outlet 24 are connected. The glue inlet 22 is connected to the manifold flow channel 18 to allow molten plastic to flow in. The glue outlet 24 is adjacent to the bottom of the cavity plate 17 so that the plastic is poured into the cavity of the mold.

[0029] The hot nozzle assembly 10 further includes a movable core 30 connected to the sprue bushing 21, and the sprue bushing 21 is provided with at least two branch channels 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, and the movable core 30 can be adjusted to move upward or downward in the extension direction of the longitudinal axis X to adjust the gap between the upper end 32 and the hot nozzle 20.

[0030] When the plastic flow needs to be adjusted, the movable core 30 is adjusted to move upward or downward in the extension direction of the longitudinal axis X, so that the gap between the upper end 32 and the hot nozzle 20 is reduced or increased to adjust the plastic flow. 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 the length of the movable core 30 in the extension direction of the longitudinal axis X is small, and the movable core 30 is rigidly connected to the gate sleeve 21, and there is no need to set up a driving mechanism for driving the movable core 30 to move, so the structure is simple, the cost is very low, and it is also very convenient to adjust the plastic flow.

[0031] The hot nozzle 20 has an upper flow channel 26, a lower matching portion 28 fixedly matched with the gate sleeve 21, and an inclined portion 36 located between the upper flow channel 26 and the lower matching portion 28. The branch channel 34 has an upper inlet 38 facing the inclined portion 36 and a lower outlet 40 connected to the glue outlet 24.

[0032] At least two runners 34 are evenly distributed on the gate bushing 21 about the longitudinal axis X. Preferably, the extension direction of the runner 34 is parallel to the longitudinal axis X. When the movable core 30 is adjusted upward or downward, the gap between the upper end 32 and the inclined portion 36 becomes smaller or larger, thereby adjusting the flow rate of the plastic. The inclined portion 36 is a conical surface, and the angle formed by the inclined portion 36 and the inner wall of the upper flow channel 26 is an obtuse angle. Preferably, the angle formed by the inclined portion 36 and the inner wall of the upper flow channel 26 is 145 degrees.

[0033] Further, the movable core 30 is threadedly connected to the sprue bushing 21. In the lateral direction perpendicular to the longitudinal axis X, part of the sprue bushing 21 is located between the hot nozzle 20 and the movable core 30. In the extension direction of the longitudinal axis X, part of the sprue bushing 21 protrudes from the hot nozzle 20. Further, an internal thread portion is provided on part of the inner wall of the sprue bushing 21, and an external thread portion matching 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 will be completely away from the upper runner 26 or only partially located in the upper runner 26. When the movable core 30 is rotated to move gradually away from the glue inlet 22, as the gap between the upper end 32 and the hot nozzle 20 gradually increases, the flow rate of the plastic will gradually increase until the flow rate of the plastic is at its maximum, and the movable core 30 is completely away from the upper flow channel 26; when the movable core 30 is rotated to move gradually closer to the glue inlet 22, as the gap between the upper end 32 and the hot nozzle 20 gradually decreases, the flow rate of the plastic will gradually decrease, so that when the flow rate of the plastic is at its minimum or completely zero, a small part of the movable core 30 is located in the upper flow channel 26. And when the flow rate of the plastic is at its maximum, the movable core 30 still does not protrude from the hot nozzle 20. The length of the movable core 30 is very small, and there is no need to set up a driving mechanism for driving the movable core 30.

[0034] Preferably, the outer diameter of the movable core 30 is not less than the inner diameter of the upper flow channel 26. In addition, in the preferred embodiment, the movable core 30 is always rigidly connected to the sprue bushing 21, which prevents the deformation and deviation of the movable core 30, making the hot nozzle assembly 10 more stable and reliable, and having a longer service life.

[0035] Furthermore, the upper end portion 32 has an inclined surface 46 parallel to the inclined portion 36 and a spherical surface 47 located at the end of the upper end portion 32 and connected to the inclined surface 46. Preferably, the upper inlet 38 is arranged closer to the inclined portion, so that plastic will not accumulate between the sprue bushing 21 and the hot nozzle 20. When the movable core 30 is adjusted to move upward or downward in the extension direction 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 of the plastic. When the movable core 30 is adjusted so that the inclined portion 36 fits the inclined surface 46, the flow rate of the plastic is zero, that is, the glue discharge is completely closed. Since the inclined portion 36 is in surface contact with the inclined surface 46, the closing effect of the plastic is better.

[0036] The sprue bushing 21 has an upper connection portion 48 connected to the movable core 30, a lower portion 50 forming a plastic outlet 24, and a middle portion 52 connecting the upper connection portion 48 and the lower portion 50. In a direction perpendicular to the longitudinal axis X, there is a certain gap between the lower portion 50 and the middle portion 52 and the movable core 30, and the lower outlet 40 is located in the middle portion 52. The internal thread portion is provided on the upper connection portion 48. The middle portion 52 is arranged to be arc-shaped and concave outward relative to the movable core 30, so that the gap between the movable core 30 and the middle portion 52 is larger, which is more convenient for the plastic to flow out.

[0037] The movable core 30 has a lower end 42 opposite to the upper end 32, and the lower end 42 faces the glue outlet 24. The circumference of the lower end 42 gradually decreases from the external threaded portion of the movable core 30 to the end of the lower end 42, thereby further increasing the gap between the lower end 42 and the middle part of the movable core 30, making it easier for the plastic to flow out. Furthermore, the lower end 42 is provided with an adjustment portion 44 that is matched or disengaged with an external adjustment tool (not shown). When it is necessary to adjust the movable core 30 upward or downward along the extension direction of the longitudinal axis X, the external adjustment tool is extended from the glue outlet 24 into the gate sleeve 21, and the external adjustment tool is matched with the adjustment portion 44, thereby rotating the movable core 30 upward or downward. When the adjustment is completed, the adjustment tool is separated from the adjustment portion 44 and the adjustment tool is removed.

[0038] Preferably, the adjusting portion 44 is configured as an inner hexagon. Of course, the adjusting portion 44 may also be configured as an outer hexagon or other structural forms, as long as it can be adapted to the adjustment tool to rotate the movable core 30. In this preferred embodiment, the adjusting portion 44 is configured as an inner hexagon, and the movable core 30 can be adjusted with an ordinary hexagonal wrench, and the adjusting portion 44 is configured on the lower end portion 42, so that the adjusting portion 44 is closer to the glue outlet 24, thereby making the movable core 30 more convenient to adjust.

[0039] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0040] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection 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 sleeve fixedly arranged inside the hot nozzle, the hot nozzle having a glue inlet, the sprue sleeve having a glue outlet, the glue inlet and the glue outlet being connected, characterized in that: The hot nozzle assembly further comprises a movable core threadedly connected to the sprue sleeve, the sprue sleeve is provided with at least two branch channels connecting a glue inlet and a glue outlet, the movable core has an upper end facing the glue inlet, and the movable core can be adjusted to move upward or downward in the extension direction of the longitudinal axis to adjust the gap between the upper end and the hot nozzle, so as to adjust the flow rate of the plastic; The hot nozzle also has an upper flow channel, a lower matching portion fixedly matched with the gate sleeve, and an inclined portion located between the upper flow channel and the lower matching portion. The branch channel has an upper inlet facing the inclined portion and a lower outlet connected to the glue outlet.

2. The hot nozzle assembly according to claim 1, characterized in that: The outer diameter of the movable core is not less than the inner diameter of the upper flow channel.

3. The hot nozzle assembly according to claim 1, characterized in that: The upper end portion has an inclined surface parallel to the inclined portion. When the movable core is adjusted to move upward or downward in the extending direction of the longitudinal axis, the gap between the inclined surface and the inclined portion can be adjusted to adjust the flow rate of the plastic.

4. The hot nozzle assembly according to claim 1, characterized in that: The gate sleeve has an upper connecting part connected to the movable core, a lower part forming the glue outlet, and a middle part connecting the upper connecting part and the lower part. In the direction perpendicular to the longitudinal axis, there is a certain gap between the lower part and the middle part and the movable core, and the lower outlet is located in the middle part.

5. The hot nozzle assembly according to claim 1, characterized in that: The at least two branch channels are evenly distributed on the sprue bushing with respect to the longitudinal axis.

6. The hot nozzle assembly according to claim 1, characterized in that: The extension direction of the branch channel is parallel to the longitudinal axis.

7. A hot runner system, comprising a mold and a hot nozzle assembly provided on the mold, The hot nozzle assembly comprises a hot nozzle extending along the longitudinal axis, and a sprue sleeve fixedly arranged inside the hot nozzle, wherein the hot nozzle has a glue inlet, and the sprue sleeve has a glue outlet, and the glue inlet and the glue outlet are connected, and the characteristics are as follows: The hot nozzle assembly further comprises a movable core threadedly connected to the sprue sleeve, the sprue sleeve is provided with at least two branch channels connecting a glue inlet and a glue outlet, the movable core has an upper end facing the glue inlet, and the movable core can be adjusted to move upward or downward in the extension direction of the longitudinal axis to adjust the gap between the upper end and the hot nozzle, so as to adjust the flow rate of the plastic; The hot nozzle also has an upper flow channel, a lower matching portion fixedly matched with the gate sleeve, and an inclined portion located between the upper flow channel and the lower matching portion. The branch channel has an upper inlet facing the inclined portion and a lower outlet connected to the glue outlet.

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