CN116587541A - Hot nozzle assembly and hot runner system - Google Patents

Abstract

The application provides a hot nozzle assembly and a hot runner system, wherein the hot nozzle assembly comprises a hot nozzle and a cylinder, the cylinder comprises a cylinder body with an opening at one end and a piston movably connected in the cylinder body, one end of the opening of the cylinder body is connected to the hot nozzle, the hot nozzle comprises a valve needle, a hot nozzle runner and a liquid outlet communicated with the hot nozzle runner, one end of the valve needle is connected to the piston, the other end of the valve needle penetrates through the hot nozzle from the opening and stretches into the hot nozzle runner, and the piston can move away from or towards the liquid outlet in a driving manner so as to enable the valve needle to open and close the liquid outlet. The application solves the problem that when the valve needle longitudinally moves to open and close the liquid outlet, the friction force of the split flow plate is increased, so that the movement is unsmooth.

Description

Hot nozzle assembly and hot runner system

Technical Field

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

Background

The existing needle valve type hot nozzle assembly is generally provided with an oil cylinder or an air cylinder right above a flow dividing plate, and a valve needle penetrating through the flow dividing plate is driven to open or close a liquid outlet, so that plastic is controlled to enter a die cavity. On one hand, the structure has the advantages that the thickness of the flow dividing plate is thicker due to the existence of the oil cylinder or the air cylinder, and the manufacturing cost of the hot nozzle assembly is higher; on the other hand, because the thermal expansion of the flow dividing plate and the thermal nozzle in the transverse direction is inconsistent, the valve needle is transversely stressed and inclined, so that the friction force of the flow dividing plate is increased when the valve needle longitudinally moves to open and close the liquid outlet, and the problem of unsmooth movement is generated.

Therefore, in the needle valve type hot nozzle assembly in the prior art, when the valve needle moves longitudinally to open and close the liquid outlet, the friction force of the flow dividing plate is increased, so that the movement is unsmooth.

Disclosure of Invention

The application aims to provide a hot nozzle assembly and a hot runner system, which are used for solving the problem that in the prior art, when a valve needle longitudinally moves to open and close a liquid outlet, the friction force of a flow dividing plate is increased, so that the movement is unsmooth.

In order to achieve the above object, an embodiment of the present application provides a hot nozzle assembly, which includes a hot nozzle and a cylinder, wherein the cylinder includes a cylinder body with an opening at one end, and a piston movably connected in the cylinder body, one end of the opening of the cylinder body is connected to the hot nozzle, the hot nozzle includes a valve needle, a hot nozzle flow channel, and a liquid outlet communicated with the hot nozzle flow channel, one end of the valve needle is connected to the piston, the other end of the valve needle is inserted into the hot nozzle from the opening and extends into the hot nozzle flow channel, and the piston can be driven to move away from or toward the liquid outlet so as to open and close the liquid outlet by the valve needle.

As a further improvement of an embodiment of the present application, the cylinder is provided with a first air inlet hole and a second air inlet hole which are communicated with the inside and the outside of the cylinder, the piston is driven to move away from the liquid outlet when the first air inlet hole is inflated, and the piston is driven to move towards the liquid outlet when the second air inlet hole is inflated.

As a further improvement of an embodiment of the present application, the hot nozzle assembly further includes a flow dividing plate connected to the cylinder body, the flow dividing plate has a flow dividing channel, a connecting channel is provided on the cylinder body in a penetrating manner, and the hot nozzle channel is communicated with the flow dividing channel through the connecting channel.

As a further improvement of an embodiment of the present application, the hot nozzle further comprises a bushing, wherein one end of the bushing is disposed on the cylinder, the other end of the bushing is disposed on the hot nozzle, and the hot nozzle runner is communicated with the connecting runner through the bushing.

As a further improvement of an embodiment of the present application, the flow dividing plate is provided with a first air charging flow passage communicated with the first air inlet hole and a second air charging flow passage communicated with the second air inlet hole, the first air charging flow passage can charge air to the first air inlet hole, and the second air charging flow passage can charge air to the second air inlet hole.

As a further improvement of an embodiment of the present application, the cylinder includes a sealing member, a mounting groove is circumferentially formed around the piston, and the sealing member is mounted in the mounting groove and contacts with an inner side wall of the cylinder body.

As a further improvement of an embodiment of the present application, the hot nozzle further includes a hot nozzle body and a nozzle tip, the nozzle tip is disposed on one end of the hot nozzle body, and the other end of the hot nozzle body is connected with the opening end of the cylinder.

As a further improvement of an embodiment of the present application, an annular protrusion is provided on the end of the hot nozzle body connected to the cylinder body, and extends outward in the radial direction of the hot nozzle body, a screw is provided on the annular protrusion, and the hot nozzle body is connected to the end face of the opening end of the cylinder body through the screw.

As a further improvement of an embodiment of the present application, a heating element is provided circumferentially around the cylinder and circumferentially around the hot nozzle body.

The application further provides a hot runner system which comprises the template and the hot nozzle assembly, wherein the template is provided with the accommodating cavity, the hot nozzle is arranged in the accommodating cavity, the cylinder body is arranged at the cavity opening of the accommodating cavity and is at least partially positioned in the cavity opening, the limiting piece is sleeved on the circumference of the cylinder body, the limiting part is arranged on the inner side of the cavity opening, and the limiting piece is abutted to the limiting part.

As a further improvement of an embodiment of the present application, the limiting part includes a sunken step surface disposed along one side of the end surface of the cavity opening near the interior of the accommodating cavity, and a connecting wall connecting the end surface of the cavity opening and the sunken step surface, and the limiting part includes a flange sleeved on the cylinder body, and the flange abuts against the connecting wall and the sunken step surface.

Compared with the prior art, the application has the beneficial effects that:

one end of the cylinder body opening is connected to the hot nozzle, one end of the valve needle is connected to the piston, the other end of the valve needle penetrates through the hot nozzle from the opening and stretches into the hot nozzle flow channel, the valve needle only penetrates through the hot nozzle, and when the valve needle is heated, the valve needle is prevented from being blocked due to the fact that friction force of the flow distribution plate is increased in the radial direction due to the fact that expansion coefficients of the flow distribution plate and the hot nozzle are different.

Drawings

FIG. 1 is a schematic view of a part of a thermal nozzle assembly according to an embodiment of the present application;

FIG. 2 is a schematic illustration of the valve needle of FIG. 1 with the valve needle removed;

FIG. 3 is a schematic cross-sectional view of the top view of FIG. 1;

FIG. 4 is an enlarged view of M in FIG. 1;

FIG. 5 is a schematic diagram of a hot runner system according to an embodiment of the present application;

fig. 6 is an enlarged view at N in fig. 5.

The above description of the drawings includes the following reference numerals:

1. a hot nozzle; 11. a valve needle; 12. a hot nozzle body; 121. a hot nozzle flow passage; 122. an annular protrusion; 13. a mouth tip; 131. a liquid outlet;

2. a cylinder; 21. a cylinder; 211. a first air inlet hole; 212. a second air inlet hole; 213. a connecting runner; 22. a piston; 23. a seal;

3. a diverter plate; 31. a flow dividing channel; 32. a first inflation flow path; 33. a second inflation flow path;

4. a bushing;

5. heating element

6. A template; 61. a receiving chamber; 611. a limit part; 6111. a sinking step surface; 6112. a connecting wall;

7. and (3) a flange.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.

In the present application, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present application.

In the prior art, one end of the valve needle is usually connected with a driving mechanism on the flow dividing plate, and the other end of the valve needle penetrates through the flow dividing plate and the hot nozzle and stretches into a flow passage in the hot nozzle. When setting up like this, when dividing board and hot mouth heating, because dividing board and the expansion coefficient of hot mouth self thermal expansion are different, the needle is in the vertical motion in order to open and shut the liquid outlet, and the needle receives the frictional force of dividing board and will increase, leads to the motion unsmooth.

As shown in fig. 1-4, a hot nozzle assembly comprises a hot nozzle 1 and a cylinder 2, wherein the cylinder 2 comprises a cylinder body 21 with an opening at one end and a piston 22 movably connected in the cylinder body, one end of the opening of the cylinder body is connected to the hot nozzle 1, the hot nozzle 1 comprises a valve needle 11, a hot nozzle flow passage 121 and a liquid outlet 131 communicated with the hot nozzle flow passage, one end of the valve needle 11 is connected to the piston, the other end of the valve needle penetrates through the hot nozzle 1 from the opening and stretches into the hot nozzle flow passage 121, and the piston 22 can be driven to move away from or towards the liquid outlet 131 so as to enable the valve needle to open and close the liquid outlet 131.

In fig. 1, the connecting flow path 213 and the hot nozzle flow path 121 on the cylinder 21 are partially omitted, and are not shown in the drawing, but will be understood by those of ordinary skill in the art.

Through the above arrangement, one end of the opening of the cylinder 21 is connected to the hot nozzle 1, one end of the valve needle 11 is connected to the piston 22, and the other end is arranged through the hot nozzle 1 and extends into the hot nozzle flow passage 121 from the opening, and as can be understood, the valve needle 11 is arranged only through the hot nozzle, when heated, the friction force of the valve needle in the radial direction is increased due to the difference between the expansion coefficients of the flow dividing plate and the hot nozzle 1, and the valve needle is blocked.

Referring to fig. 1 and 2, further, a first air inlet 211 and a second air inlet 212 are provided on the cylinder body, which are communicated with the inside and the outside of the cylinder body, when the first air inlet 211 is inflated, the piston 22 is driven to move away from the liquid outlet 131, and when the second air inlet 212 is inflated, the piston 22 is driven to move toward the liquid outlet 131.

It will be appreciated that the movement of the piston 22 is achieved by charging the space inside the cylinder 21 on either side of the piston 22, respectively. For example, when the first air intake hole 211 is inflated, the piston 22 is driven to move away from the liquid outlet 131, alternatively, when the first air intake hole 211 is inflated, the second air intake hole 212 is communicated with the outside to facilitate air exhaust, or when the first air intake hole 211 is inflated, the second air intake hole 212 can also be pumped out to the outside, so that more effort is saved when the first air intake hole 211 is inflated.

Accordingly, the piston 22 is drivingly moved toward the outlet 131 when the second inlet hole 212 is inflated, and the first inlet hole 211 is disposed in a substantially similar manner to the above-described arrangement when the second inlet hole 212 is inflated, as will be appreciated by those skilled in the art.

Referring to fig. 1 and 2, the hot nozzle assembly further includes a flow dividing plate 3 connected to the cylinder 21, the flow dividing plate 3 has a flow dividing channel 31, a connecting channel 213 is disposed on the cylinder 21 in a penetrating manner, and the hot nozzle channel 121 is communicated with the flow dividing channel through the connecting channel.

Referring to fig. 1 and 4, the hot nozzle assembly further includes a liner 4, one end of the liner 4 is disposed on the cylinder, the other end is disposed on the hot nozzle, the hot nozzle flow passage 121 is communicated with the connection flow passage 213 through the liner 4, and the liner 4 is generally made of a heat insulating material and is provided as a tube. Communicating the hot nozzle flow passage 121 and the connecting flow passage 213 through the bush 4 can prevent the hot nozzle flow passage 121 and the connecting flow passage 213 from leaking at the junction.

Further, the splitter plate 3 is provided with a first air-charging flow channel 32 communicated with the first air inlet 211 and a second air-charging flow channel 33 communicated with the second air inlet 212, the first air inlet 211 can be inflated through the first air-charging flow channel 32, and the second air inlet 212 can be inflated through the second air-charging flow channel 33. The first and second intake holes 211 and 212 may be inflated by using an inflation device, such as an inflation valve, in communication with the first and second inflation flow passages 32 and 33.

Further, the cylinder 2 includes a seal member 23, a mounting groove is circumferentially provided around the piston 22, and the seal member 23 is mounted in the mounting groove and contacts with the inner side wall of the cylinder 21. The sealing member 23 is generally elastic, and the gap between the piston 22 and the side wall of the cylinder 21 can be sealed by the arrangement of the sealing member 23, and the position of the valve needle 11 in the radial direction can be finely adjusted by the other surface, so that the pressure between the valve needle 11 and the hot nozzle 1 is relatively small, and the friction force is relatively small when the valve needle 11 opens and closes the liquid outlet 131.

Further, the hot nozzle 1 further includes a hot nozzle body 12 and a nozzle tip 13, the nozzle tip 13 is disposed at one end of the hot nozzle body 12, and the other end of the hot nozzle body 12 is connected with the opening end of the cylinder 21. The hot nozzle flow channel 121 includes a first portion located in the hot nozzle body 12 and a second portion located in the nozzle tip 13, where the second portion communicates with the first portion and the liquid outlet 131 on the nozzle tip 13, and it can be understood that the first portion communicates with the second portion to form the hot nozzle flow channel 121.

Referring to fig. 1, optionally, an annular protrusion 122 is disposed at an end of the hot nozzle body 12 connected to the cylinder 21 and extends radially outward of the hot nozzle body 12, a screw is disposed on the annular protrusion 122 in a penetrating manner, and the hot nozzle body 12 is connected to an end face of an opening end of the cylinder 21 through the screw.

The heating element 5 is circumferentially provided around the cylinder 21 and the nozzle body 12.

Referring next to fig. 5, an embodiment of the present application further provides a hot runner system, where the hot runner system includes a mold plate 6 and a hot nozzle assembly as described above, the mold plate 6 has a receiving cavity 61, the hot nozzle 1 is disposed in the receiving cavity, the cylinder 21 is disposed at a cavity opening of the receiving cavity 61 and is at least partially located in the cavity opening, a limiting member is sleeved on a circumferential direction of the cylinder 21, a limiting portion 611 is disposed on an inner side of the cavity opening, and the limiting member abuts against the limiting portion, so that the hot nozzle assembly can be accurately positioned on the mold plate 6.

Referring specifically to fig. 6, the limiting part 611 includes a sunken step surface 6111 disposed along one side of the end surface of the cavity opening near the interior of the accommodating cavity, and a connecting wall 6112 connecting the end surface of the cavity opening and the sunken step surface, and the limiting member includes a flange 7 sleeved on the cylinder body, and when the hot nozzle assembly is mounted inside the mold plate 6, the flange 7 abuts against the connecting wall 6112 and the sunken step surface 6111. So that the position of the entire hot nozzle assembly is defined.

In summary, the following technical effects are achieved by the embodiments of the present application:

one end of the opening of the cylinder body 21 is connected to the hot nozzle 1, one end of the valve needle 11 is connected to the piston 22, the other end of the valve needle 11 penetrates through the hot nozzle 1 from the opening and stretches into the hot nozzle flow passage 121, the valve needle 11 only penetrates through the hot nozzle, and when heated, the friction force of the valve needle, which is increased in the radial direction and is caused by the fact that the expansion coefficients of the flow dividing plate and the hot nozzle 1 are different, is not increased, so that the valve needle is blocked.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. The utility model provides a hot nozzle subassembly, its characterized in that, includes hot nozzle (1) and cylinder (2), cylinder (2) include one end open-ended cylinder body (21), swing joint in the cylinder body piston (22), cylinder body open-ended one end is connected on hot nozzle (1), hot nozzle (1) include needle (11), hot nozzle runner (121) and with liquid outlet (131) of hot nozzle runner intercommunication, the one end of needle (11) is connected on the piston, the other end is from the opening wears to locate hot nozzle (1) and stretches into in hot nozzle runner (121), piston (22) drivably keep away from or towards liquid outlet (131) motion, so that the needle switching liquid outlet (131).

2. A hot nozzle assembly according to claim 1, wherein the cylinder is provided with a first air inlet hole (211) and a second air inlet hole (212) which are communicated with the inside and the outside of the cylinder, the piston (22) is driven to move away from the liquid outlet (131) when the first air inlet hole (211) is inflated, and the piston (22) is driven to move towards the liquid outlet (131) when the second air inlet hole (212) is inflated.

3. A hot nozzle assembly according to claim 2, further comprising a flow dividing plate (3) connected with the cylinder (21), wherein the flow dividing plate (3) is provided with a flow dividing channel (31), a connecting channel (213) is arranged on the cylinder (21) in a penetrating manner, and the hot nozzle channel (121) is communicated with the flow dividing channel (31) through the connecting channel (213).

4. A hot nozzle assembly according to claim 3, further comprising a bushing (4), one end of the bushing (4) being arranged on the cylinder and the other end being arranged on the hot nozzle, the hot nozzle flow channel (121) being in communication with the connecting flow channel (213) through the bushing (4).

5. A thermal nozzle assembly according to claim 3, wherein the splitter plate (3) is provided with a first air charging flow channel (32) communicated with the first air inlet hole (211) and a second air charging flow channel (33) communicated with the second air inlet hole (212), the first air inlet hole (211) can be inflated through the first air charging flow channel (32), and the second air inlet hole (212) can be inflated through the second air charging flow channel (33).

6. A hot nozzle assembly according to claim 1, characterized in that the cylinder (2) comprises a sealing member (23), the piston (22) being circumferentially provided with a mounting groove, the sealing member (23) being mounted in the mounting groove and being in contact with the inner side wall of the cylinder (21).

7. The hot nozzle assembly according to claim 1, wherein the hot nozzle (1) further comprises a hot nozzle body (12) and a nozzle tip (13), the nozzle tip (13) is arranged on one end of the hot nozzle body (12), and the other end of the hot nozzle body (12) is connected with the opening end of the cylinder body (21).

8. A hot nozzle assembly according to claim 7, characterized in that an annular protrusion (122) is provided on the end of the hot nozzle body (12) connected to the cylinder (21) and extends radially outwards of the hot nozzle body (12), a screw is provided on the annular protrusion (122), and the hot nozzle body (12) is connected to the end face of the opening end of the cylinder (21) by the screw.

9. A hot nozzle assembly according to claim 7, characterized in that a heating element (5) is arranged circumferentially around the cylinder (21) and circumferentially around the hot nozzle body (12).

10. A hot runner system, characterized in that the hot runner system comprises a template (6) and a hot nozzle assembly according to any one of claims 1-9, the template (6) is provided with a containing cavity (61), the hot nozzle (1) is arranged in the containing cavity, a cylinder body (21) is arranged at a cavity opening of the containing cavity (61) and is at least partially positioned in the cavity opening, a limiting part is sleeved on the circumference of the cylinder body (21), a limiting part (611) is arranged on the inner side of the cavity opening, and the limiting part is abutted against the limiting part.

11. The hot runner system according to claim 10, wherein the limiting part (611) comprises a sunken step surface (6111) arranged along one side, close to the interior of the accommodating cavity, of the end surface of the cavity opening and a connecting wall (6112) connecting the end surface of the cavity opening and the sunken step surface, the limiting part comprises a flange (7) sleeved on the cylinder body, and the flange (7) is abutted against the connecting wall (6112) and the sunken step surface (6111).