Hot runner system

Abstract

This application provides a hot runner system, including a hot runner plate with a cavity and a hot nozzle disposed in the cavity. The shape of the cavity matches the shape of the hot nozzle and includes a head cavity and a tail cavity. The hot nozzle includes a body and a tip partially disposed within the body. The head cavity and tail cavity are arranged along a first direction, and the tip and body are also arranged along the first direction. The outer diameter of the first end of the body with the tip is equal to the inner diameter of the head cavity of the cavity. The hot runner system provided by this application prevents glue from overflowing into the cavity by fitting the hot nozzle body with the inner wall of the hot runner plate. Even if multiple tips are provided on the body, glue overflow will not easily occur due to the accumulation of tolerances of the caps on the multiple tips.

Description

Technical Field

[0001] This application relates to the field of hot runner technology, and more particularly to a hot runner system. Background Technology

[0002] In a hot runner system, the hot runner plate has cavities to accommodate and fix the hot nozzles. To prevent the glue flowing from the hot nozzles from overflowing into the cavity from the side, pressure caps are usually used to fit against the inner wall of the cavity to prevent glue overflow. However, when a hot nozzle body contains multiple nozzle tips, multiple pressure caps are installed over these tips. As the number of nozzle tips increases, errors accumulate, making it difficult to ensure that each pressure cap is concentric with the corresponding sprue on the mold. This leads to a cumulative increase in the risk of glue overflow. Summary of the Invention

[0003] The purpose of this application is to provide a hot runner system that uses the body of the hot nozzle to cooperate with the cavity to prevent glue overflow. This solves the problem in the prior art where, when using a cap to prevent glue overflow, the superposition of cap tolerances leads to concentricity difficulties and makes the glue overflow situation more serious when a hot nozzle has multiple tips.

[0004] To achieve one of the above-mentioned objectives, one embodiment of this application provides a hot runner system, including a hot runner plate with a cavity and a hot nozzle disposed in the cavity. The shape of the cavity matches the shape of the hot nozzle and includes a head cavity and a tail cavity. The hot nozzle includes a body and a tip partially disposed within the body. The head cavity and the tail cavity are arranged along a first direction, and the tip and the body are also arranged along the first direction. The outer diameter of the first end of the body with the tip is equal to the inner diameter of the head cavity of the cavity.

[0005] As a further improvement of one embodiment of this application, the mouth tip is provided with at least two.

[0006] As a further improvement of one embodiment of this application, it also includes a pressure cap, which is disposed between the body and the tip of the mouth and partially protrudes from the body.

[0007] As a further improvement of one embodiment of this application, it also includes a heat insulation cap, which is sleeved outside the pressure cap and has an interference fit with the pressure cap and the cavity.

[0008] As a further improvement of one embodiment of this application, the cavity further includes a mating cavity communicating with the head cavity, the mating cavity being provided corresponding to the tip of the mouth and fitting the shape of the heat insulation cap.

[0009] As a further improvement of one embodiment of this application, the cavity is provided with a first positioning groove with an opening facing the first direction, and the first end of the body is provided with a first positioning groove with an opening away from the first direction. The hot runner system also includes a positioning pin, which is disposed in the first positioning groove and the second positioning groove.

[0010] As a further improvement of one embodiment of this application, a protrusion is provided at the second end of the body, and the protrusion is provided with a slit to prevent the hot nozzle from rotating.

[0011] As a further improvement of one embodiment of this application, the body is provided with a feed inlet, at least two branch channels, and at least two connecting channels connecting the feed inlet and the at least two branch channels. The feed inlet is coaxially arranged with the body, and the branch channels and their corresponding nozzle tips are coaxially arranged.

[0012] As a further improvement of one embodiment of this application, the body is also provided with at least two clearance holes, which connect the flow channel and the second end of the body and are coaxially arranged with the flow channel.

[0013] As a further improvement of one embodiment of this application, the second end of the body is further provided with an annular sealing groove, and a sealing ring is provided in the annular sealing groove. In the axial direction of the hot nozzle, the height of the sealing ring is higher than the depth of the annular sealing groove.

[0014] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0015] In the hot runner system provided in this application, the outer diameter of the first end of the body is set to be the same as the inner diameter of the cavity at the corresponding first end position. That is, by the body of the hot nozzle cooperating with the inner wall of the cavity of the hot runner plate, the glue is prevented from overflowing into the cavity. Even if multiple nozzle tips are provided on the body, the glue will not easily overflow due to the accumulation of tolerances of the pressure caps on the multiple nozzle tips. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the hot runner system in an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the structure of the body in the embodiments of this application.

[0018] Figure 3 yes Figure 2 A top view of the main body.

[0019] Figure 4 yes Figure 3 Schematic diagram of cross section along line AA.

[0020] 1. Hot runner plate; 11. Cavity; 111. Head cavity; 112. Tail cavity; 113. Mating cavity; 114. First positioning groove; 2. Hot nozzle; 21. Body; 211. Receiving cavity; 212. Second positioning groove; 213. Feed port; 214. Flow channel; 215. Connecting flow channel; 216. Clearance hole; 217. Annular sealing groove; 22. Nozzle tip; 23. Protrusion; 231. Cut edge; 3. Pressure cap; 4. Heat insulation cap; 5. Sealing ring; Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] The terms used in this document, such as “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” indicating spatial relative positions, are used for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms “spatial relative positions” may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0023] For example, if the device in the figure is flipped, a unit described as being "below" or "under" other units or features will be "above" other units or features. Therefore, the exemplary term "below" can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise) and the spatially related descriptive terms used herein will be interpreted accordingly.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] This application provides a hot runner system, such as Figure 1 As shown, it includes a hot runner plate 1 with a cavity 11 and a hot nozzle 2 disposed in the cavity 11. The shape of the cavity 11 matches the shape of the hot nozzle 2 and includes a head cavity 111 and a tail cavity 112. The hot nozzle 2 includes a body 21 and a nozzle tip 22 partially disposed in the body 21. The head cavity 111 and the tail cavity 112 are arranged along a first direction, and the nozzle tip 22 and the body 21 are also arranged along the first direction. The outer diameter of the first end of the body 21 where the nozzle tip 22 is disposed is equal to the inner diameter of the head cavity 111 of the cavity 11.

[0026] like Figure 1 In the image, the direction indicated by the arrow is the first direction, which can also be understood as upward. Figure 1 The red box in the middle indicates the boundary of hot runner plate 1.

[0027] The inner diameter of the tail cavity 112 is larger than the inner diameter of the head cavity 111, and most of the body 21 is disposed in the tail cavity 112, with a very small portion disposed in the head cavity 111.

[0028] The outer diameter of the first end of the body 21 is set to be equal to the inner diameter of the head cavity 111 of the cavity 11, so that there is no gap between the side wall of the first end of the body 21 and the inner wall of the cavity 11. Even if multiple nozzles 22 are provided on the body 21, the colloid cannot enter the upper tail cavity 112.

[0029] When multiple nozzles 22 are provided on a body 21, in actual processing and production, the tolerance of only the inner wall of the cavity 11 and the outer wall of the first end of the body 21 are superimposed. Compared with the fit between multiple pressure caps 3 and the inner wall of the cavity 11, in addition to the processing tolerance of the inner wall of the cavity 11, there is also the superposition of the tolerances of multiple pressure caps 3, which makes it easier to cause glue overflow.

[0030] In one embodiment of this application, at least two mouth tips 22 are provided, such as... Figure 1 In the middle, there are two mouth tips 22. Correspondingly, the main body 21 is provided with two receiving cavities 211. The two mouth tips 22 are respectively partially disposed in the two receiving cavities 211 and partially protrude out of the main body 21.

[0031] In one embodiment of this application, the hot runner system provided in this application further includes a pressure cap 3. The pressure cap 3 is partially disposed between the body 21 and the nozzle tip 22, and partially protrudes from the body 21. The pressure cap 3 is sleeved on the outside of the nozzle tip 22 and partially disposed in the receiving cavity 211. The pressure cap 3 is threadedly engaged with the receiving cavity 211 to press the nozzle tip 22 upward against the body 21, thereby fixing the nozzle tip 22.

[0032] In one embodiment of this application, the hot runner system provided in this application also includes a heat insulation cap 4, which is sleeved outside the pressure cap 3, and the heat insulation cap 4 is interference-fitted with the pressure cap 3 and the cavity 11.

[0033] The heat insulation cap 4 is usually made of a relatively soft material that can be squeezed by the pressure cap 3 and the hot runner plate 1. The deformation of the heat insulation cap 4 fills the gap between the pressure cap 3 and the inner wall of the cavity 11, further reducing the possibility of the colloid entering the cavity 11, and forming a double insurance with the cooperation of the body 21 and the inner wall of the cavity 11.

[0034] In one embodiment of this application, the cavity 11 further includes a mating cavity 113 that communicates with the head cavity 111. The mating cavity 113 is provided corresponding to the tip of the mouth 22 and matches the shape of the heat insulation cap 4.

[0035] The shape of the mating cavity 113 matches the shape of the heat insulation cap 4, so that the heat insulation cap 4, which is sleeved on the outside of the pressure cap 3, is placed inside the mating cavity 113 and matches the inner wall of the mating cavity 113, preventing the colloid from overflowing due to gaps in the mating cavity 113.

[0036] In one embodiment of this application, the cavity 11 is provided with a first positioning groove 114 with an opening facing the first direction, and the first end of the body 21 is provided with a first positioning groove 114 with an opening away from the first direction. The hot runner system also includes a positioning pin (not shown), which is disposed in the first positioning groove 114 and the second positioning groove 212.

[0037] The cavity 11 and the hot nozzle 2 are positioned by the first positioning groove 114, the second positioning groove 212 and the positioning pin to prevent the hot nozzle 2 from being misaligned during installation.

[0038] like Figure 2 As can be seen from the above, there are two sets of first positioning groove 114, second positioning groove 212 and positioning pin. The two second positioning grooves 212 are symmetrically arranged on the end face of the first end of the body 21 along the line connecting the two tips 22, so that the two tips 22 are also symmetrically arranged along the line connecting the two second positioning grooves 212, so that the body 21 is subjected to uniform force.

[0039] In one embodiment of this application, a protrusion 23 is provided at the second end of the body 21, and the protrusion 23 is provided with a slit 231 to prevent the hot nozzle 2 from rotating. The body 21 extends into the cavity 11 from the opening end of the tail cavity 112. The body 21 is circular in shape. The slit 231 is provided on the protrusion 23, and a protrusion corresponding to the slit 231 is provided at the corresponding position in the tail cavity 112. The two work together to prevent the body 21 from rotating.

[0040] Preferably, there are two tangentially arranged cutting edges 231, which makes the body 21 symmetrical and the force evenly distributed.

[0041] In one embodiment of this application, the body 21 is provided with a feed inlet 213, at least two branch channels 214, and at least two connecting channels 215 connecting the feed inlet 213 and the at least two branch channels 214. The feed inlet 213 is coaxially arranged with the body 21, and the branch channels 214 and their corresponding nozzle tips 22 are coaxially arranged.

[0042] The colloid enters through the feed inlet 213 of the body 21, and then is divided into multiple portions, as in this embodiment. Figure 4 The middle part is divided into two, and the flow enters the branch channel 214 parallel to the axis of the body 21 through the inclined connecting channel 215, and then enters the nozzle tip 22 through the branch channel 214 and is injected into the mold.

[0043] In one embodiment of this application, the body 21 is further provided with at least two clearance holes 216, which connect the flow channel 214 and the second end of the body 21 and are coaxially arranged with the flow channel 214.

[0044] The clearance hole 216 is used for the valve needle to pass through, and the valve needle is used for sealing. The valve needle passes through the clearance hole 216 and the flow channel 214 in sequence, and then cooperates with the nozzle tip 22, moving up and down within the clearance hole 216 and the flow channel 214 to achieve sealing. Therefore, the clearance hole 216 must be coaxially set with the flow channel 214 to avoid bending and damage to the valve needle.

[0045] In one embodiment of this application, the second end of the body 21 is also provided with an annular sealing groove 217, and a sealing ring 5 is provided in the annular sealing groove 217. In the axial direction of the hot nozzle 2, the height of the sealing ring 5 is higher than the depth of the annular sealing groove 217.

[0046] The hot nozzle 2 feeds the adhesive through the feed port 213 of the body 21. The second end of the body 21 needs to be in contact with other hot runner plates 1. An annular sealing groove 217 is provided at the second end of the body 21. The feed port 213 is located within the area surrounded by the annular sealing groove 217. A sealing ring 5 is provided in the annular sealing groove 217. When other hot runner plates 1 are in contact with the second end of the body 21, the sealing ring 5, which is thicker than the depth of the annular sealing groove 217, is squeezed and deformed to prevent the adhesive from overflowing from the feed port 213 to the outside of the body 21.

[0047] Preferably, the sealing ring 5 is made of copper. Copper has good ductility and can deform under pressure, thereby making the copper ring fit more tightly with the body 21 and with other hot runner plates 1, thus preventing glue overflow. Figure 1 The middle part refers to the sealing ring 5 being squeezed and deformed to the same height as the annular sealing ring 5.

[0048] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A hot runner system, characterized in that, The device includes a hot runner plate with a cavity and a hot nozzle disposed in the cavity. The shape of the cavity matches the shape of the hot nozzle and includes a head cavity and a tail cavity. The hot nozzle includes a body and a tip partially disposed in the body. The head cavity and the tail cavity are arranged along a first direction, and the tip and the body are also arranged along the first direction. The outer diameter of the first end of the body with the tip is equal to the inner diameter of the head cavity of the cavity.

2. The hot runner system according to claim 1, characterized in that, The mouth tip is provided with at least two.

3. The hot runner system according to claim 2, characterized in that, It also includes a pressure cap, which is located between the body and the tip of the mouth, and partially protrudes from the body.

4. The hot runner system according to claim 3, characterized in that, It also includes a heat insulation cap, which is fitted over the pressure cap and has an interference fit with the pressure cap and the cavity.

5. The hot runner system according to claim 4, characterized in that, The cavity also includes a mating cavity that communicates with the head cavity, the mating cavity being positioned corresponding to the tip of the mouth and fitting the shape of the heat-insulating cap.

6. The hot runner system according to claim 1, characterized in that, The cavity is provided with a first positioning groove with an opening facing the first direction, and the first end of the body is provided with a first positioning groove with an opening away from the first direction. The hot runner system also includes a positioning pin, which is disposed in the first positioning groove and the second positioning groove.

7. The hot runner system according to claim 1, characterized in that, The second end of the body is provided with a protrusion, and the protrusion is provided with a cut edge to prevent the hot nozzle from rotating.

8. The hot runner system according to claim 1, characterized in that, The main body is provided with a feed inlet, at least two branch channels, and at least two connecting channels connecting the feed inlet and the at least two branch channels. The feed inlet is coaxially arranged with the main body, and the branch channels and their corresponding nozzle tips are coaxially arranged.

9. The hot runner system according to claim 8, characterized in that, The body is also provided with at least two clearance holes, which connect the flow channel and the second end of the body and are coaxially arranged with the flow channel.

10. The hot runner system according to claim 1, characterized in that, The second end of the body is also provided with an annular sealing groove, and a sealing ring is provided in the annular sealing groove. In the axial direction of the hot nozzle, the height of the sealing ring is higher than the depth of the annular sealing groove.

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