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 glue inlet and a glue outlet located inside the hot nozzle, and a flow channel connecting the glue inlet and the glue outlet, the flow channel includes an upper flow channel and a lower flow channel with a circumference larger than the upper flow channel, the hot nozzle assembly also includes a movable core connected to the lower flow channel, 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 glue inlet and a glue outlet located inside the hot nozzle, and a flow channel connecting the glue inlet and the glue outlet, wherein:

[0006] The flow channel includes an upper flow channel and a lower flow channel with a circumference larger than the upper flow channel. The hot nozzle assembly also includes a movable core connected to the lower flow channel. The movable core has an upper end facing the glue inlet. 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 hot nozzle, and at least two branch channels are provided on the movable core, and the branch channels are connected to the upper flow channel and the glue outlet.

[0008] As a further improvement of an embodiment of the present invention, the at least two branch flow channels are evenly distributed on the movable core about the longitudinal axis.

[0009] As a further improvement of one embodiment of the present invention, the hot nozzle has an inclined portion connecting the upper flow channel and the lower flow channel, and the branch flow channel has an upper inlet facing the inclined portion and a lower outlet facing the glue outlet.

[0010] 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 the upper inlet is located on the inclined surface.

[0011] As a further improvement of one embodiment of the present invention, the movable core has a lower end portion opposite to the upper end portion, and the flow channel has an upper flow channel and a lower flow channel that is angled with and communicates with the upper flow channel.

[0012] As a further improvement of an embodiment of the present invention, the lower branch flow channel is parallel to the extension direction of the lower flow channel.

[0013] As a further improvement of an embodiment of the present invention, an extension direction of the upper branch flow channel forms an obtuse angle with an extension direction of the lower branch flow channel.

[0014] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention further provides a hot runner system, the hot runner system comprising a mold and a hot nozzle assembly arranged on the mold, the hot nozzle assembly comprising a hot nozzle extending along a longitudinal axis, the hot nozzle having a glue inlet, a glue outlet and a flow channel connecting the glue inlet and the glue outlet, wherein:

[0015] The flow channel includes an upper flow channel and a lower flow channel with a circumference larger than the upper flow channel. The hot nozzle assembly also includes a movable core connected to the lower flow channel, the movable core has an upper end facing the upper flow channel, 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.

[0016] As a further improvement of an embodiment of the present invention, the movable core is threadedly connected to the hot nozzle, and at least two branch channels are provided on the movable core, and the branch channels are connected to the upper flow channel and the glue outlet.

[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 does not need to be provided with a driving mechanism, 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, 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 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 5 As 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 nozzle 20 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 can also be provided according to specific needs, and a manifold flow channel 18 connected to the two hot nozzle assemblies 10 is provided on the manifold plate 16.

[0028] Specifically, the hot nozzle assembly 10 includes a hot nozzle 20 extending along the longitudinal axis X, a glue inlet 22 located inside the hot nozzle 20, a glue outlet 24, and a flow channel connecting the glue inlet 22 and the glue outlet 24. In this preferred embodiment, the glue inlet 22 and the glue outlet 24 are both provided at the hot nozzle 20, and the glue inlet 22 is connected to the manifold flow channel 18 for the 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 flow channel includes an upper flow channel 26 and a lower flow channel 28 having a circumference larger than the upper flow channel 26. The hot nozzle assembly 10 also includes a movable core 30 connected to the lower flow channel 28. The movable core 30 has an upper end 32 facing the glue inlet 22. 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 flow rate of plastic 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 flow rate of plastic. 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 does not need to be provided with a driving mechanism, so the structure is simple, the cost is very low, and it is also very convenient to adjust the flow rate of plastic.

[0031] The movable core 30 is threadedly connected to the hot nozzle 20, and at least two branch channels 34 are provided on the movable core 30, and the branch channels 34 are connected to the upper flow channel 26 and the glue outlet 24. Specifically, an internal thread portion is provided on part of the inner wall of the lower flow channel 28, 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 flow channel 26 or only a small part will be located in the upper flow channel 26. When the movable core 30 is rotated to move away from the glue inlet 22, the gap between the upper end 32 and the hot nozzle 20 gradually increases, and the flow rate of the plastic gradually increases 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 toward the glue inlet 22, the gap between the upper end 32 and the hot nozzle 20 gradually decreases, and the flow rate of the plastic gradually decreases, so that when the flow rate of the plastic is at its minimum or 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.

[0032] In addition, in the preferred embodiment, the movable core 30 is always rigidly connected to the hot nozzle 20, which prevents the movable core 30 from being deformed and offset, making the hot nozzle assembly 10 more stable and reliable and having a longer service life.

[0033] At least two branch channels 34 are evenly distributed on the movable core 30 about the longitudinal axis X. The hot nozzle 20 has an inclined portion 36 connecting the upper flow channel 26 and the lower flow channel 28, and the branch channel 34 has an upper inlet 38 facing the inclined portion 36 and a lower outlet 40 facing the glue outlet 24. 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.

[0034] The movable core 30 has a lower end 42 opposite to the upper end 32, the lower end 42 faces the glue outlet 24, and the lower outlet 40 is provided on the lower end 42. Further, the lower end 42 is provided with an adjustment portion 44 that is matched with or separated from an external adjustment tool (not shown). When the movable core 30 needs to be adjusted upward or downward along the extension direction of the longitudinal axis X, the external adjustment tool is matched with the adjustment portion 44, thereby rotating the movable core 30 upward or downward. After the adjustment is completed, the adjustment tool is separated from the adjustment portion 44 and the adjustment tool is removed.

[0035] 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.

[0036] The lower end portion 42 has a spherical surface, and the lower outlet 40 is located on the spherical surface, so that the outlet area of ​​the lower outlet 40 can be increased.

[0037] Furthermore, the upper end portion 32 has an inclined surface 46 parallel to the inclined portion 36, and the upper inlet 38 is located on the inclined surface 46. Preferably, the upper inlet 38 is arranged closer to the inner wall of the lower flow channel 28, so that plastic will not accumulate between the inclined surface 46 of the movable core 30 and the hot nozzle 20. 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.

[0038] The flow channel 34 includes an upper flow channel 48 and a lower flow channel 50 that is angled and connected to the upper flow channel 48. Preferably, the angle formed by the upper flow channel 48 and the lower flow channel 50 is 130 to 140 degrees. Specifically in this embodiment, the angle formed by the upper flow channel 48 and the lower flow channel 50 is 135 degrees.

[0039] In addition, the lower runner 50 is parallel to the extension direction of the lower runner 28. In other words, the lower runner 50 is parallel to the extension direction of the longitudinal axis X. The extension direction of the upper runner 48 forms an obtuse angle with the extension direction of the lower runner 50. The upper runner 48 extends upwardly and obliquely from the connection with the lower runner 50 to a direction gradually away from the longitudinal axis X.

[0040] 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.

[0041] 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 glue inlet and a glue outlet located inside the hot nozzle, and a flow channel connecting the glue inlet and the glue outlet, characterized in that: The flow channel comprises an upper flow channel and a lower flow channel with a circumference larger than that of the upper flow channel, the hot nozzle assembly further comprises a movable core connected to the lower flow channel, the movable core has an upper end facing the glue inlet, 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 movable core is threadedly connected in the hot nozzle, at least two branch flow channels are arranged on the movable core, the at least two branch flow channels are evenly distributed on the movable core with respect to the longitudinal axis, and the branch flow channels are connected to both the upper flow channel and the glue outlet; The hot nozzle has an inclined portion connecting the upper flow channel and the lower flow channel, and the branch flow channel has an upper inlet facing the inclined portion and a lower outlet facing the glue outlet; The upper end portion has an inclined surface parallel to the inclined portion, and the upper inlet is located on the inclined surface.

2. The hot nozzle assembly according to claim 1, characterized in that: The movable core has a lower end portion opposite to the upper end portion, and the flow channel has an upper flow channel and a lower flow channel which is angled with and communicated with the upper flow channel.

3. The hot nozzle assembly according to claim 2, characterized in that: The lower branch flow channel is parallel to an extending direction of the lower flow channel.

4. The hot nozzle assembly according to claim 3, characterized in that: An extension direction of the upper branch flow channel forms an obtuse angle with an extension direction of the lower branch flow channel.

5. A hot runner system, comprising a mold and a hot nozzle assembly arranged on the mold, wherein the hot nozzle assembly comprises a hot nozzle extending along a longitudinal axis, the hot nozzle having a glue inlet, a glue outlet and a flow channel connecting the glue inlet and the glue outlet, characterized in that: The flow channel includes an upper flow channel and a lower flow channel with a circumference larger than that of the upper flow channel, the hot nozzle assembly also includes a movable core connected to the lower flow channel, the movable core has an upper end facing the upper flow channel, 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 movable core is threadedly connected in the hot nozzle, at least two branch flow channels are arranged on the movable core, the at least two branch flow channels are evenly distributed on the movable core with respect to the longitudinal axis, and the branch flow channels are connected to the upper flow channel and the glue outlet; The hot nozzle has an inclined portion connecting the upper flow channel and the lower flow channel, and the branch flow channel has an upper inlet facing the inclined portion and a lower outlet facing the glue outlet; The upper end portion has an inclined surface parallel to the inclined portion, and the upper inlet is located on the inclined surface.

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