CN115923057A - Heating type hot runner device - Google Patents

Abstract

The invention provides a heating type hot runner device which comprises a flow distribution plate, a plurality of hot nozzles connected to the flow distribution plate and a heating device for heating the flow distribution plate and the hot nozzles, wherein each hot nozzle comprises a hot nozzle body and a plurality of nozzle tips, one end of each hot nozzle body is connected with the flow distribution plate, the other end of each hot nozzle body is provided with the plurality of nozzle tips, and all the nozzle tips of the plurality of hot nozzles are staggered in the transverse direction and the longitudinal direction. The invention solves the problems of raw material waste, long forming period and high product reject ratio caused by adopting a three-plate cold runner mold for pouring when the distance between glue inlet points is small.

Description

Heating type hot runner device

Technical Field

The invention relates to the technical field of hot runner injection molding, in particular to a heating type hot runner device.

Background

There are generally two different processes in the injection molding process that use a cold runner and a hot runner. The cold runner is a part between a mold inlet and a product gate, plastic keeps a flowing state in the runner by injection pressure and heat of the plastic, and the runner is used as a part of a molding material and does not belong to a product (the cold runner part belongs to injection molding residues). The cold runner has the advantages of being easy to use, capable of well controlling the distance between glue feeding points and well meeting certain attractive requirements.

Hot runners are a common component of injection molding systems and are heated to ensure that the plastic in the runner and sprue remains molten. Because the heating rod or the heating ring is arranged near or in the center of the runner, the whole runner from the nozzle outlet of the injection molding machine to the sprue is in a high-temperature state, so that the plastic in the runner is kept molten, the runner does not need to be opened during shutdown to take out the solidified material, and the hot runner can be heated to the required temperature only after the machine is started up again.

In the prior art, when the distance of glue feeding points is extremely small, for example, the distance of the glue feeding points is less than or equal to 10mm, if a hot runner is used for injection molding, a certain installation distance is required between nozzle tips arranged on a hot nozzle body of the hot runner, so that the distance between the glue feeding points formed by tips on the nozzle tips cannot meet the requirement of the precision.

In the face of the above situation, a three-plate cold runner mold is usually adopted for casting, and a plurality of glue feeding points can be arranged in the cold runner mold according to the distance requirement of the glue feeding points so as to meet the requirement on precision. However, this method has the following technical problems:

1. a cold stub bar is generated, so that the waste of raw materials is caused;

2. the molding cycle of the mould is long, and the efficiency is poor;

3. if the requirement of the forming temperature of the raw material is higher, the forming failure of the product is easily caused, and the product yield is lower.

Disclosure of Invention

The invention aims to provide a heating type hot runner device, which aims to solve the problems that in the prior art, when the distance between glue inlet points is small, a three-plate type cold runner mold is adopted for pouring, raw materials are wasted, the forming period is long, and the product reject ratio is high.

In order to achieve the above object, according to one embodiment of the present invention, there is provided a heated hot runner apparatus including a manifold, a plurality of hot nozzles connected to the manifold, and a heating device for heating the manifold and the hot nozzles, wherein each of the hot nozzles includes a hot nozzle body and a plurality of tips, one end of the hot nozzle body is connected to the manifold, the other end of the hot nozzle body is provided with the plurality of tips, and all the tips of the plurality of hot nozzles are staggered in a lateral direction and a longitudinal direction.

As a further improvement of an embodiment of the invention, a distance between any two adjacent ones of all the tips of the plurality of the hot nozzles in the transverse direction is a predetermined value, and the predetermined value is less than or equal to 10mm.

As a further improvement of an embodiment of the present invention, any two of all the tips of the plurality of the hot nozzles are located on different straight lines in the longitudinal direction.

As a further improvement of an embodiment of the present invention, the hot nozzle body is provided in a rectangular prism shape, and an end of the hot nozzle body away from the flow distribution plate is provided in a rectangular shape.

As a further improvement of an embodiment of the present invention, the heating device includes a first heating unit disposed on a splitter plate, the splitter plate has a first surface connected to the hot nozzle and a second surface located on a back side of the first surface, the first heating unit includes a plurality of first heating wires, and the plurality of first heating wires are embedded in an irregular ring shape on the first surface and the second surface.

As a further improvement of an embodiment of the present invention, the heating device includes a second heating unit disposed on the side wall of the hot nozzle body, the second heating unit includes a plurality of second heating wires embedded in the side wall of the hot nozzle body in an irregular ring shape, and terminals of the plurality of second heating wires are disposed on a side of the side wall of the hot nozzle body close to the diversion plate.

As a further improvement of an embodiment of the present invention, the hot nozzle body defines a first flow passage, the tip defines a second flow passage communicating with the first flow passage and a plurality of gates communicating with the second flow passage, the plurality of gates being disposed on a tip end of the tip.

As a further improvement of an embodiment of the present invention, the hot nozzle further includes a pressing cap fixedly connected to an inner side of the hot nozzle body by a screw thread, and the pressing cap abuts against the nozzle tip in an axial extending direction of the hot nozzle body to fix the nozzle tip to the inner side of the hot nozzle body.

As a further improvement of an embodiment of the present invention, the hot nozzle further includes a heat insulation cap, the heat insulation cap is sleeved on a peripheral surface of a tip of the nozzle tip and is clamped between the pressing cap and the tip, and the gate is disposed at a position on the tip inside the heat insulation cap.

As a further improvement of an embodiment of the present invention, the heating type hot runner device includes a material filling plate connected to the flow distribution plate, the material filling plate has a main filling nozzle and is internally provided with a drainage channel communicated with the main filling nozzle, one end of the drainage channel far from the main filling nozzle is communicated with the first channel through the flow distribution channel in the flow distribution plate, the heating device includes a plurality of third heating wires, and the plurality of third heating wires are disposed on two end faces of the material filling plate to heat the material filling plate.

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

through set up a plurality of hot mouths on the flow distribution plate to every hot mouth includes hot mouth body and a plurality of mouth point, the staggered arrangement cooperation in horizontal and vertical all mouth points of a plurality of hot mouths to make the distance between the gluey point of advancing that the pointed end of mouth point formed can reach the required precision of pouring technology.

Drawings

FIG. 1 is a schematic structural view of a heated hot runner apparatus according to an embodiment of the present invention;

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at X;

FIG. 4 is a top view of FIG. 1;

FIG. 5 is an exploded schematic view of FIG. 1;

FIG. 6 is an enlarged view at M in FIG. 5;

FIG. 7 is a schematic view of the construction of the hot nozzle of FIG. 5;

FIG. 8 is a top view of FIG. 7;

FIG. 9 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 8;

fig. 10 is a schematic view of the construction of the tip of fig. 7.

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

1. a splitter plate;

2. a hot nozzle; 21. a hot nozzle body; 211. a first flow passage; 22. a tip of the mouth; 221. a tip; 2211. a gate; 222. a tubular connecting portion; 2221. an annular flange; 223. a second flow passage; 24. pressing the cap; 26. a heat insulating cap;

3. a heating device; 31. a first heater wire; 32. a second heating wire; 321. a terminal; 33. a third heating wire;

4. a material filling plate; 41. a main irrigation nozzle; 42. an ear mount; 421. fastening a bolt; 5. an article of manufacture;

a1, transverse; a2, longitudinal direction.

Detailed Description

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

It is noted that, unless otherwise indicated, 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.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In the injection molding process, for some particular articles, very small distances between the glue sites are encountered. For example, the distance between the glue feeding points is less than or equal to 10mm. If the hot runner is used for injection molding of such products, the distance between the glue feeding points formed by the tips of the nozzle tips cannot meet the precision requirement at all because the nozzle tips arranged on the hot runner hot nozzle body need a specific installation distance.

Therefore, for such a product with a very small glue inlet point distance, a three-plate cold runner mold is generally adopted for pouring in the prior art, and a plurality of glue inlet points can be arranged in the cold runner mold according to the distance requirement of the glue inlet points so as to meet the requirement on precision. However, this method has problems of waste of raw materials, long molding cycle, and high product defective rate. To solve these problems, the present invention provides a heated hot runner apparatus.

As shown in fig. 1 to 10, a heated hot runner apparatus according to an embodiment of the present invention includes a manifold 1, a plurality of hot nozzles 2 connected to the manifold 1, and a heating device 3 for heating the manifold 1 and the hot nozzles 2, wherein each of the hot nozzles 2 includes a hot nozzle body 21 and a plurality of tips 22, one end of the hot nozzle body 21 is connected to the manifold 1, and the other end is provided with the plurality of tips 22, and all the tips 22 of the plurality of hot nozzles 2 are staggered in a transverse direction A1 and a longitudinal direction A2. Through the arrangement, the plurality of hot nozzles 2 are arranged on the flow distribution plate 1, each hot nozzle 2 comprises the hot nozzle body 21 and the plurality of nozzle tips 22, and all the nozzle tips 22 of the plurality of hot nozzles 2 are in staggered arrangement and match on the transverse direction A1 and the longitudinal direction A2, so that the distance between glue inlet points formed by the nozzle tips 22 can meet the precision requirement of a pouring process.

Specifically, when all the tips 22 of the plurality of hot tips 2 are alternately arranged in the transverse direction A1 and the longitudinal direction A2, the distance between any two adjacent tips 22 in the transverse direction A1 among the above-described all the tips 22 in the transverse direction A1 may be a predetermined value, and the predetermined value may be 10mm or less.

It should be noted that, referring to fig. 2-3, the distance between the two tips 22 is considered in a physical sense, which is the physical distance between the two, and may be referred to as L. It will be appreciated that, in a physical sense, the tip 22 adjacent to a tip 22 is the one of the plurality of tips 22 that is the smallest physical distance L relative thereto.

Two tips 22 adjacent in the transverse direction A1 are taken as a reference direction with the transverse direction A1, and the distance between the two tips in this direction is considered and recorded as distance d in this embodiment. It is understood that the tip 22 adjacent to a certain tip 22 in the transverse direction A1 is the one of the tips 22 whose distance d from the tip 22 in the direction A1 is the shortest. Thus, a tip 22 adjacent to a tip 22 in the direction A1 is not necessarily the tip 22 that is physically closest to it in the sense of physical distance L.

By staggering all the tips 22 of the plurality of hot nozzles 2, the distance between any two adjacent tips 22 in the transverse direction A1 can meet the precision required by the processing technology, for example, less than or equal to 10mm, so as to meet the requirement of the distance between glue feeding points.

As a preferred embodiment, any two of all the tips 22 of a plurality of the hot nozzles 2 are located on different straight lines in the longitudinal direction A2. This arrangement avoids the two tips 22 being located on the same straight line in the longitudinal direction A2, and avoids the excessive placement of the tips 22 during the processing of the product 5, which results in waste.

Preferably, the hot nozzle body 21 is set to be a rectangular prism, and one end of the hot nozzle body 21 away from the splitter plate 1 is set to be a rectangular shape. The oblong shape of the end surface facilitates the alignment of the tip 22.

Further, heating device is including setting up the first heating element on flow distribution plate 1, flow distribution plate 1 have with the first face that hot mouth 2 is connected and be located the second face at the first face back, first heating element includes a plurality of first heater strips 31, and is a plurality of first heater strip 31 is irregular cyclic annular to inlay and establish on first face and the second face.

Generally speaking, on the first face of flow distribution plate 1 and the second face, be equipped with multistage mounting groove, it is a plurality of first heater strip 31 joint respectively is in a plurality of in the mounting groove to can be even provide the heat for the different positions of flow distribution plate 1.

Correspondingly, heating device is including setting up second heating element on the hot nozzle body 21 lateral wall, second heating element includes that many are irregular cyclic annular and inlay and establish second heater strip 32 on the lateral wall of hot nozzle body, and is a plurality of the terminal 321 of second heater strip 32 sets up be close to on the hot nozzle body 21 lateral wall one side of flow distribution plate 1.

It should be noted that the hot nozzle body 21 defines a first flow passage 211, the nozzle tip 22 defines a second flow passage 223 communicated with the first flow passage 211 and a plurality of gates 2211 communicated with the second flow passage 223, and the plurality of gates 2211 are disposed on the tip end 221 of the nozzle tip 22.

Further, the hot nozzle 2 further comprises a pressing cap 24 fixedly connected to the inner side of the hot nozzle body 21 through threads, and in the axial extension direction of the hot nozzle body 21, the pressing cap 24 abuts against the nozzle tip 22 so as to fix the nozzle tip 22 to the inner side of the hot nozzle body 21.

Specifically, the tip 22 includes a tip 221 and a tubular connecting portion 222 connecting the tip 221, the tip 221 is generally formed in an inverted cone shape, and a tube wall of the tubular connecting portion 222 is connected to an upper end of a side wall of the inverted cone shape of the tip 221. A plurality of gates 2211 are provided on the side wall of the tip 221 of the reverse taper.

Further, an annular flange 2221 is provided on a side of the circumferential surface of the side wall of the tubular connecting portion 222 away from the tip 221 having the reverse tapered shape, and the pressing cap 24 abuts against the flange 2221 in the axial direction of the hot nozzle body 21 from the tip 221 toward the tubular connecting portion 222, so as to fix the nozzle tip 22 to the inside of the hot nozzle body 21.

Alternatively, the pointed end 221 may be disposed to completely protrude out of the lower end surface of the hot nozzle body 21, or at least a portion of the pointed end 221 may be disposed outside the hot nozzle body 21.

Preferably, the hot nozzle 2 further comprises an insulating cap 26, the insulating cap 26 is sleeved on the circumference of the tip 221 of the nozzle tip and clamped between the pressing cap 24 and the tip 221, and the insulating cap 26 can reduce heat loss at the pouring gate 2211.

Further, the gate 2211 is disposed at the position of the tip 221 inside the thermal insulation cap 26, so that heat loss at the gate 2211 is reduced by the thermal insulation cap 26, and outflow of the molten injection material in the gate 2211 is not affected.

In this embodiment, the heating type hot runner device further comprises a material filling plate 4 connected with the flow distribution plate 1, the material filling plate 4 is provided with a main filling nozzle 41 and is internally provided with a drainage flow channel communicated with the main filling nozzle 41, one end of the drainage flow channel far away from the main filling nozzle 41 is passed through the flow distribution flow channel in the flow distribution plate 1 and the first flow channel 211 are communicated, the heating device 3 comprises a plurality of third heating wires 33, and the third heating wires 33 are arranged on two end faces of the material filling plate 4 to heat the material filling plate 4. The material filling plate 4 can be heated by the third heating wire 33, so that the injection molding material in the material filling plate 4 can be kept in a molten state after entering from the main filling nozzle 41, and can circulate through the diversion flow channel of the diversion plate and the drainage flow channel.

Generally, for a large injection molding product, such as the product 5 in this embodiment, the material pouring plate 4 can be connected to a plurality of splitter plates 1, so as to complete the injection molding of the large product 5.

It should be noted that, in this example, a plurality of lug seats 42 are provided on the pouring plate 4, fastening bolts 421 penetrate through the lug seats 42, the flow distribution plate 1 has a second surface facing the pouring plate 4, a mounting hole for accommodating a screw rod of the fastening bolt 421 is provided on the second surface, and the pouring plate 4 and the flow distribution plate 1 can be connected together by matching the fastening bolts 421, the lug seats 42 and the mounting hole.

In summary, the embodiments of the present invention achieve the following technical effects:

by arranging the plurality of hot nozzles 2 on the flow distribution plate 1, each hot nozzle 2 comprises the hot nozzle body 21 and the plurality of nozzle tips 22, all the nozzle tips 22 of the plurality of hot nozzles 2 are in staggered arrangement and match on the transverse A1 and the upper-level longitudinal A2, and thus, the distance between glue inlet points formed by the nozzle tips 22 can meet the precision requirement of a pouring process.

It is to be understood that the above-described embodiments are only a few, and not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, shall fall within the protection scope of the present invention.

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 intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The heating type hot runner device comprises a flow distribution plate (1), a plurality of hot nozzles (2) connected to the flow distribution plate (1) and a heating device (3) for heating the flow distribution plate and the hot nozzles, and is characterized in that each hot nozzle (2) comprises a hot nozzle body (21) and a plurality of nozzle tips (22), one end of each hot nozzle body (21) is connected with the flow distribution plate (1), the other end of each hot nozzle body is provided with the plurality of nozzle tips (22), and all the nozzle tips (22) of the plurality of hot nozzles (2) are staggered in the transverse direction and the longitudinal direction.

2. The heated hot-runner apparatus according to claim 1 wherein any two of the entire tips (22) of a plurality of the hot nozzles (2) that are adjacent in the transverse direction are at a distance in the transverse direction that is a predetermined value that is less than or equal to 10mm.

3. A heated hot-runner apparatus according to claim 2 wherein any two of all the tips (22) of a plurality of the hot nozzles (2) are longitudinally on different straight lines.

4. A heated hot runner apparatus according to claim 1 wherein the hot nozzle body (21) is provided in the shape of a rectangular prism of a cuboid and the end of the hot nozzle body (21) remote from the manifold (1) is provided in the shape of a rectangle.

5. A heated hot runner apparatus according to claim 1 comprising a first heating unit provided on a manifold (1), the manifold (1) having a first face connected to the hot nozzle (2) and a second face opposite the first face, the first heating unit comprising a plurality of first heating wires (31), the plurality of first heating wires (31) being embedded in an irregular loop on the first and second faces.

6. The heated hot-runner apparatus according to claim 1 comprising a second heating unit provided on the side wall of the hot nozzle body (21), the second heating unit comprising a plurality of second heating wires (32) embedded in an irregular ring shape on the side wall of the hot nozzle body, terminals (321) of the plurality of second heating wires (32) being provided on the side wall of the hot nozzle body (21) near the manifold plate (1).

7. The heated hot-runner apparatus according to claim 1 wherein the hot-nozzle body (21) defines a first flow channel (211), the tip (22) defines a second flow channel (223) in communication with the first flow channel (211) and a plurality of gates (2211) in communication with the second flow channel (223), the plurality of gates (2211) being disposed on a tip (221) of the tip (22).

8. A heated hot runner apparatus according to claim 7 wherein the hot nozzle (2) further comprises a press cap (24) that is fixedly connected to the inside of the hot nozzle body (21) by threads, and the press cap (24) abuts against the nozzle tip (22) in the axial extension direction of the hot nozzle body (21) to fix the nozzle tip (22) to the inside of the hot nozzle body (21).

9. The heated hot-runner apparatus according to claim 8 wherein the hot nozzle (2) further comprises a thermal insulating cap (26), the thermal insulating cap (26) fitting over the circumference of the tip (221) of the nozzle tip and being clamped between the pressing cap (24) and the tip (221), the gate (2211) being provided on the tip (221) at a position inside the thermal insulating cap (26).

10. A heated hot runner apparatus according to claim 7, comprising a material filling plate (4) connected to the flow distribution plate (1), wherein the material filling plate (4) has a main filling nozzle (41) and is internally provided with a drainage channel communicated with the main filling nozzle (41), one end of the drainage channel far away from the main filling nozzle (41) is communicated with the first channel (211) through the flow distribution channel in the flow distribution plate (1), and the heating apparatus (3) comprises a plurality of third heating wires (33), and the plurality of third heating wires (33) are arranged on two end faces of the material filling plate (4) to heat the material filling plate (4).

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