Hot nozzle assembly and hot runner system comprising same

Abstract

The utility model discloses a hot nozzle assembly and a hot runner system including the same, the hot nozzle assembly comprises a hot nozzle body and a nozzle tip fixedly connected below the hot nozzle body, the hot nozzle body is in a hollow cylinder shape and comprises a tubular part and a mounting part connected above the tubular part, the radial length of the tubular part is smaller than that of the mounting part, and the nozzle tip is fixedly connected below the hot nozzle body. The hot nozzle body further comprises a positioning part, and the positioning part protrudes downwards from the lower surface of the mounting part. Therefore, the device does not need to be additionally matched with a flange, and is directly positioned in a mounting hole of a template of a correspondingly matched splitter plate. Therefore, even if the mounting holes need to be formed in the template of the matched splitter plate, a milling machine does not need to be used for machining, only the corresponding mounting holes need to be ground by a grinding machine, the operation is relatively simple, relatively consistent sizes are relatively easily formed, the assembly tolerance is eliminated, and the glue leakage problem of a hot runner system is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot runner technical field especially relates to a hot nozzle assembly and including its hot runner system. BACKGROUND

[0002] At present, the injection mold widely used in injection industry is hot runner injection mold, compared with common mold, the plastic product quality of injection through hot runner system is higher, and hot runner system has the advantages of saving raw materials, improving production efficiency, automation degree is high.

[0003] Hot runner system usually includes shunt plate assembly, valve needle, driving device, hot nozzle assembly, usually, hot nozzle assembly is with flange cooperation, then fixed on the template, but, if want to be fixed on the template through flange, need to utilize milling machine to process flange countersunk hole on the template, but, if want to process multiple flange countersunk hole at a time, it is difficult to guarantee that the depth of countersunk hole is consistent, then, under this condition, if the hot nozzle assembly of same size is installed in these flange countersunk hole, assembly tolerance is difficult to eliminate, and the glue leakage of hot runner system is prone to occur.

[0004] Therefore, it is necessary to design a hot nozzle assembly and hot runner system comprising the same which reduces assembly tolerance. SUMMARY

[0005] In order to solve the technical problem of large assembly tolerance between the hot nozzle and the shunt plate template in the prior art, the purpose of the utility model is to provide a hot nozzle assembly and a hot runner system comprising the same.

[0006] In order to achieve one of the above purposes, an embodiment of the utility model provides a hot nozzle assembly, which comprises a hot nozzle body and a nozzle tip connected and fixed below the hot nozzle body, the hot nozzle body is hollow and cylindrical and comprises a tubular part and a mounting part connected above the tubular part, the radial length of the tubular part is less than that of the mounting part, and the hot nozzle body further comprises a positioning part which protrudes downward from the lower surface of the mounting part.

[0007] As a further improvement of the embodiment of the utility model, the positioning part is annular and belongs to the same shaft as the tubular part.

[0008] As a further improvement of the embodiment of the utility model, the tubular part comprises a tubular body and a heater distributed on the surface of the tubular body.

[0009] As a further improvement of the embodiment of the utility model, the heater is spaced apart from the positioning part.

[0010] As a further improvement of the embodiment of the utility model, the heater comprises a plurality of arc-shaped protrusions protruding from the surface of the tubular body, and the arc-shaped protrusions are spaced apart from each other.

[0011] As a further improvement of an embodiment of the present application, the circumferential surface of the mounting portion is recessed radially inward to form a dismounting groove, the upper side of the dismounting groove forms a matching portion, the lower side of the dismounting groove forms a hanging portion, and the positioning portion is arranged on the lower surface of the hanging portion.

[0012] As a further improvement of an embodiment of the present application, the matching portion and the hanging portion protrude radially outward by the same length.

[0013] As a further improvement of an embodiment of the present application, the circumferential surfaces of the matching portion and the hanging portion are respectively recessed inward to form an upper clamping groove and a lower clamping groove, and the hot nozzle assembly further comprises a rotation-stopping pin, which is accommodated in the upper clamping groove and the lower clamping groove and protrudes downward out of the lower surface of the hanging portion.

[0014] To achieve one of the above-mentioned purposes, an embodiment of the present application provides a hot runner system, which comprises a flow distribution plate assembly, a valve needle, a driving device, and a hot nozzle assembly as described above, the flow distribution plate assembly comprises a mold plate, the mold plate is provided with a mounting hole, and the hot nozzle assembly is inserted into the mounting hole from top to bottom.

[0015] As a further improvement of an embodiment of the present application, the mounting hole comprises a first through hole and a second through hole which are connected in series, the diameter of the first through hole is larger than that of the second through hole, the tubular portion and the nozzle tip are inserted from the second through hole, the positioning portion is matched with the first through hole, and the mounting portion is hung on the upper surface of the flow distribution plate.

[0016] Compared with the prior art, the present application has the following beneficial effects: in the embodiment, the hot nozzle body comprises a positioning portion, the positioning portion is located on the lower surface of the mounting portion, does not need to be matched with a flange, and is directly positioned in the mounting hole of the mold plate of the corresponding matched flow distribution plate. Therefore, even if the mounting hole is to be arranged on the mold plate of the corresponding matched flow distribution plate, it does not need to be processed by a milling machine, but only needs to be ground by a grinding machine to form a corresponding mounting hole, which is relatively simple to operate and relatively easy to form a relatively consistent size, eliminates assembly tolerance, and avoids the glue leakage problem of the hot runner system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a partial cross-sectional schematic view of the hot runner system of an embodiment of the present application;

[0018] Figure 2 is Figure 1 an enlarged schematic view of the circular portion;

[0019] Figure 3 is a three-dimensional structural schematic view of the hot nozzle assembly of an embodiment of the present application from one perspective;

[0020] Figure 4 is a perspective structure schematic diagram of another view of the hot nozzle assembly of an embodiment of the utility model;

[0021] Figure 5 is a perspective structure schematic diagram of the hot nozzle assembly removing the rotation stop pin of an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model will be described in detail below in combination with the specific implementation manners shown in the drawings. However, these implementation manners do not limit the utility model, and the structural, method or functional changes made by the ordinary skilled in the art according to these implementation manners are all included in the protection scope of the utility model.

[0023] Referring to Figures 1 to 5 , an embodiment of the utility model provides a kind of hot nozzle assembly and the hot runner system comprising the hot nozzle assembly, specifically, the hot runner system is set to valve needle type hot runner system, it includes shunt plate assembly, hot nozzle assembly, valve needle and driving device.

[0024] Hot nozzle assembly is assembled on the shunt plate assembly, and hot runner for molten rubber to flow is formed in the shunt plate assembly and hot nozzle assembly.The hot runner includes distribution channel formed in the shunt plate assembly and conveying channel formed in hot nozzle assembly, wherein: the distribution channel has glue inlet compatible with injection molding machine nozzle and at least one glue outlet;Hot nozzle assembly is assembled at the glue outlet of the distribution channel, conveying channel is in fluid communication with the distribution channel, and conveying channel has gate corresponding to mold cavity.The shunt plate assembly includes template 90, the mounting hole 91 is opened on the template 90, and the hot nozzle assembly is inserted into the mounting hole 91 from top to bottom to be connected and fixed with the shunt plate assembly.

[0025] The valve needle is set to long rod, and its first end is directly or indirectly connected to the driving device, and its second end is arranged in the conveying channel in the hot nozzle assembly after passing through the shunt plate assembly.Under the drive of the driving device, the valve needle reciprocates along its longitudinal direction to open or close the conveying channel: when the valve needle opens the conveying channel, the molten rubber sprayed by injection molding machine nozzle enters mold cavity in sequence through the distribution channel in the shunt plate assembly and the conveying channel in the hot nozzle assembly to carry out product injection molding;When the valve needle closes the conveying channel, molten rubber cannot pass through the conveying channel in the hot nozzle assembly to enter the mold cavity, that is, product injection is stopped.

[0026] For the convenience of description, in the present application, the pointing direction from the first end of the valve needle to the second end of the valve needle in the assembled state is defined as "down", and vice versa, then the longitudinal direction of the valve needle is also called up-down direction or longitudinal direction.

[0027] In the present application, as shown in Figure 4 The hot nozzle assembly comprises a hot nozzle body 100 and a nozzle tip connected and fixed below the hot nozzle body 100. The hot nozzle body 100 is in a hollow cylindrical structure and comprises a tubular part 1 and a mounting part 2 connected above the tubular part 1. The radial length of the tubular part 1 is smaller than that of the mounting part 2. The hot nozzle body 100 further comprises a positioning part 3 which protrudes downward from the lower surface of the mounting part 2.

[0028] The hot nozzle body 100 is in a hollow cylindrical structure and has a first flow channel formed therein. The first flow channel is seamlessly connected with the glue outlet of the distribution channel and constitutes an upstream section of the conveying channel, that is, the molten glue in the distribution flow channel can directly flow into the first flow channel. The nozzle tip is also in a hollow cylindrical structure and has a second flow channel formed therein. The upper end of the nozzle tip is accommodated in the hot nozzle body 100 and protrudes downward from the hot nozzle body 100. The nozzle tip is connected below the hot nozzle body 100, and the second flow channel is connected with the first flow channel and is in communication, so that the molten glue can flow from the first flow channel of the hot nozzle body 100 into the second flow channel of the nozzle tip and then controllably flow out from the gate at the lower end of the nozzle tip into the mold cavity.

[0029] Thus, in the present embodiment, the hot nozzle body 100 comprises the positioning part 3 which is located at the lower surface of the mounting part 2 and does not need to be matched with a flange. Instead, it is directly positioned in the mounting hole 91 of the mold plate 90 of the corresponding adaptive flow distribution plate. Thus, even if the mounting hole 91 needs to be arranged on the mold plate 90 of the corresponding adaptive flow distribution plate, it does not need to be processed by a milling machine. Instead, it only needs to be ground by a grinding machine to form the corresponding mounting hole 91. The operation is relatively simple, and it is relatively easy to form a relatively consistent size, eliminates assembly tolerance, and avoids the glue leakage problem of the hot runner system.

[0030] Specifically, as shown in Figure 4 The positioning part 3 is in a circular ring shape and belongs to the same shaft as the tubular part 1. The positioning part 3 is in a circular ring shape, and obviously, the radial length of its outer ring and inner ring is between the mounting part 2 and the tubular part 1. Thus, when the hot nozzle assembly is put into the mounting hole 91, the positioning part 3 can contact the mounting hole 91, thereby being positioned and ensuring that the hot nozzle assembly is installed to the appropriate position. Of course, if the positioning part 3 is in other structures, it is also within the protection scope of the present application.

[0031] The tubular part 1 comprises a tubular body and a heater 11 distributed on the surface of the tubular body. The heater 11 is distributed around the outer surface of the tubular body, ensuring that the first flow channel and the second flow channel of the whole hot nozzle assembly are kept in a high temperature state, ensuring that the plastic is in a molten state, while shortening the molding cycle, improving the efficiency of the machine, avoiding the step of opening the flow channel to take out the condensed material in the traditional cold flow channel system, and reducing the waste of materials.

[0032] The heater 11 and the positioning part 3 are spaced apart. As described above, the positioning part 3 is located below the mounting part 2, and the tubular body on which the heater 11 is distributed is also located below the mounting part 2. Both are located below the mounting part 2, but are not connected to each other, but have a certain spacing to facilitate disassembly or maintenance of the heater 11. Of course, if they are connected to each other, it is also within the protection scope of the present application. As shown in the figure, the lower surface of the mounting part 2 is recessed upward to form a circular annular recess 20, and the heater 11 is also recessed into the annular recess 20, thereby further expanding the heating area and ensuring that the plastic in the flow channel is in a molten state. Figure 2

[0033] The heater 11 comprises a plurality of arc-shaped protrusions protruding from the surface of the tubular body, and the arc-shaped protrusions are spaced apart from each other. The heater 11 has various embodiments and can also have different structures. In this embodiment, the heater 11 is an arc-shaped protrusion formed on the surface of the tubular body, which extends in an arc shape and has an irregular structure. The arc-shaped protrusions are spaced apart from each other, further expanding the heating area.

[0034] As shown in the figure, the circumferential surface of the mounting part 2 is recessed radially inward to form a disassembly groove 21, the upper side of the disassembly groove 21 forms a fitting part 22, the lower side of the disassembly groove 21 forms a hanging part 23, and the positioning part 3 is arranged on the lower surface of the hanging part 23. Figure 3 The circumferential surface of the mounting part 2 forms a disassembly groove 21, which is used to disassemble the hot nozzle assembly from the flow distribution plate assembly. Since the hot nozzle assembly is installed in the flow distribution plate assembly, there is an assembly tolerance between the two, so that the hot nozzle assembly is more easily disassembled through the recessed disassembly groove 21.

[0035] The upper side of the disassembly groove 21 is a fitting part 22, which is convenient for abutting and fitting with other structures of the flow distribution plate assembly, and the lower side of the disassembly groove 21 is a hanging part 23, which is hung on the upper surface of the mold plate 90 of the flow distribution plate.

[0036]

[0037] ​​The fitting part 22, the hanging part 23 and the dismounting groove 21 are all circular, and the radial length of the dismounting groove 21 is slightly smaller than the fitting part 22 and the hanging part 23. Specifically, the fitting part 22 and the hanging part 23 protrude outward along the radial direction with the same length. Thus, it is easier to realize such structure in the manufacturing process. Of course, the radial length of the mounting part 2 where the dismounting groove 21 is located is still greater than the tubular part 1.

[0038] The circumferential surfaces of the fitting part 22 and the hanging part 23 are respectively inwardly recessed to form an upper clamping groove 221 and a lower clamping groove 231, and the hot nozzle assembly further comprises a rotation stopping pin 4, which is accommodated in the upper clamping groove 221 and the lower clamping groove 231 and protrudes downward from the lower surface of the hanging part 23.

[0039] As shown in Figure 4 and Figure 5 The fitting part 22 and the hanging part 23 are respectively inwardly recessed along the radial direction to form an upper clamping groove 221 and a lower clamping groove 231, and the upper end of the rotation stopping pin 4 is accommodated in the upper clamping groove 221 and the lower clamping groove 231, and the lower end protrudes downward. When cooperating with the mold plate 90 of the flow distribution plate assembly, the lower end of the rotation stopping pin 4 extends into the mold plate 90, thereby preventing the hot nozzle assembly from rotating on the mold plate 90. In the hot runner system, the hot nozzle assembly needs to be accurately aligned with the cavity of the mold to ensure that the plastic melt can be correctly injected into the mold. The rotation stopping pin 4 fixes the hot nozzle assembly to ensure that the hot nozzle assembly maintains the correct position and direction during the injection molding process, avoids the glue leakage phenomenon caused by the rotation of the hot nozzle assembly, and affects the service life of the mold and the product quality. At the same time, the rotation stopping pin 4 also helps the quick positioning of the hot nozzle assembly. When installing the hot nozzle assembly, the rotation stopping pin 4 can ensure that the hot nozzle assembly is quickly and accurately installed to the correct position, improving the efficiency and accuracy of assembly.

[0040] In the specific embodiment, grooves are arranged on the fitting part 22 and the hanging part 23 to cooperate with the rotation stopping pin 4, thereby achieving a more obvious fixing effect. Of course, if only the lower clamping groove 231 is arranged on the hanging part 23, and no groove is arranged on the fitting part 22, the purpose of the utility model can also be achieved.

[0041] Specifically, as shown in Figure 5 The upper clamping groove 221 and the lower clamping groove 231 are inwardly recessed, and the circumferential surface of the dismounting groove 21 is also inwardly recessed at the corresponding position to be flush with the three. Of course, if the upper clamping groove 221 and the lower clamping groove 231 are inwardly recessed to other depths, as long as they can cooperate with the rotation stopping pin 4, the purpose of the utility model can be achieved.

[0042] As described above, the utility model also provides a hot runner system, and including the shunt plate subassembly, the shunt plate subassembly still includes the template 90, is set up on the template 90 mounting hole 91, the hot nozzle subassembly is inserted into the mounting hole 91 from top to bottom.

[0043] Specifically, as shown in Figure 1 and Figure 2 The mounting hole 91 is through from top to bottom, the mounting hole 91 still includes the first through hole 911 and the second through hole 912 that communicate, the aperture of first through hole 911 is greater than the second through hole 912, the tubular portion 1 and the nozzle tip are inserted from the second through hole 912, the positioning portion 3 is adapted with the first through hole 911, and the mounting portion 2 is hung on the upper surface of the shunt plate. The positioning portion 3 can be just put into the first through hole 911, thereby playing a positioning role when placing the hot nozzle assembly. The hanging part 23 of the mounting portion 2 is in abutment with the surface of the template 90.

[0044] Of course, as described above, the template 90 is also provided with a template clamping groove, and the lower end of the anti-rotation pin 4 can be placed in the template clamping groove, thereby preventing the hot nozzle assembly from rotating.

[0045] Compared with the prior art, in the hot nozzle assembly and the hot runner system including the same according to an embodiment of the utility model, the positioning portion 3 is located on the lower surface of the mounting portion 2, does not need to be additionally matched with a flange, and is directly positioned in the mounting hole 91 of the template 90 of the corresponding and adapted shunt plate. Therefore, even if the mounting hole 91 needs to be arranged on the template 90 of the corresponding shunt plate, it does not need to be processed by using a milling machine, but only needs to be ground by using a grinding machine to form the corresponding mounting hole 91, the operation is relatively simple, and it is relatively easy to form a relatively consistent size, eliminates assembly tolerance, and avoids the glue leakage problem of the hot runner system.

[0046] The detailed description listed above is only a specific description of the feasible embodiments of the utility model, and is not used to limit the protection scope of the utility model, and equivalent embodiments or changes made without departing from the spirit of the utility model art should be included in the protection scope of the utility model.

Claims

1. A hot tip assembly comprising a hot tip body and a tip shank fixedly connected to a lower portion of the hot tip body, the hot tip body being hollow cylindrical and comprising a tubular portion and a mounting portion connected to an upper portion of the tubular portion, the tubular portion having a radial length less than the mounting portion, characterized in that, The hot nozzle body further comprises a positioning portion, which protrudes downward from the lower surface of the mounting portion.

2. The hot tip assembly of claim 1, wherein The positioning portion is annular and coaxial with the tubular portion.

3. The hot tip assembly of claim 2, wherein, The tubular portion comprises a tubular body and a heater distributed on the surface of the tubular body.

4. The hot tip assembly of claim 3, wherein, The heater is spaced apart from the positioning portion.

5. The hot tip assembly of claim 3, wherein The heater comprises a plurality of arc-shaped protrusions protruding from the surface of the tubular body, which are spaced apart from each other.

6. The hot tip assembly of claim 1, wherein The circumferential surface of the mounting portion is recessed radially inward to form a dismounting groove, the upper side of the dismounting groove forms a fitting portion, the lower side of the dismounting groove forms a hanging portion, and the positioning portion is arranged on the lower surface of the hanging portion.

7. The hot tip assembly of claim 6, wherein, The fitting portion and the hanging portion protrude radially outward by the same length.

8. The hot tip assembly of claim 6, wherein, The circumferential surfaces of the fitting portion and the hanging portion are respectively recessed inward to form an upper clamping groove and a lower clamping groove, the hot nozzle assembly further comprises a rotation-stopping pin, which is accommodated in the upper clamping groove and the lower clamping groove and protrudes downward beyond the lower surface of the hanging portion.

9. A hot runner system characterized by, The hot nozzle assembly comprises a flow distribution plate assembly, a valve needle, a driving device, and a hot nozzle assembly as claimed in any one of claims 1 to 8, the flow distribution plate assembly comprises a template, the template is provided with a mounting hole, and the hot nozzle assembly is inserted into the mounting hole from top to bottom.

10. The hot- runner system of claim 9, wherein The mounting hole comprises a first through hole and a second through hole which are connected in series, the diameter of the first through hole is larger than that of the second through hole, the tubular portion and the nozzle tip are inserted from the second through hole, the positioning portion is matched with the first through hole, and the mounting portion is hung on the upper surface of the flow distribution plate.

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