CN217169564U

CN217169564U - Hot runner system and hot nozzle assembly

Info

Publication number: CN217169564U
Application number: CN202221014838.2U
Authority: CN
Inventors: 李象烈
Original assignee: Yudo Suzhou Hot Runner Systems Co Ltd
Current assignee: Yudo Suzhou Hot Runner Systems Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-08-12
Anticipated expiration: 2032-04-28

Abstract

The utility model discloses a hot runner system and hot mouth subassembly, hot runner system include flow distribution plate, lower bolster, for the fixed hot mouth subassembly that sets up of lower bolster, be equipped with the flow distribution plate runner on the flow distribution plate, hot mouth subassembly have with the hot runner that the flow distribution plate runner link up mutually, wherein, hot mouth subassembly includes that hot mouth, the cover that extends along the longitudinal axis is located the heater of the partial periphery of hot mouth, and beryllium copper bush, with longitudinal axis looks vertically direction, the periphery of partial beryllium copper bush with the heater is laminated mutually, and the interior periphery of beryllium copper bush with the hot mouth is laminated mutually. The technical scheme provided by the utility model improve hot mouth heat, make the plastic keep in the molten state, have better smoothness nature.

Description

Hot runner system and hot nozzle assembly

Technical Field

The utility model relates to a hot runner mold field especially relates to a hot runner system and hot mouth subassembly.

Background

At present, the injection mold generally adopted in the injection molding industry is a hot runner injection mold, and compared with a common mold, the quality of a plastic product injected by a hot runner system is higher, and the hot runner system has the advantages of saving raw materials, improving the production efficiency, improving the automation degree and the like.

The hot runner system comprises a template and a hot nozzle assembly arranged on the template, wherein the hot nozzle assembly comprises a hot nozzle, a nozzle head arranged in the hot nozzle and a heater arranged on the periphery of the hot nozzle, and the hot nozzle and the nozzle head have higher wear resistance and need to be made of materials with high wear resistance, so that the materials with high wear resistance have poor thermal conductivity, thereby affecting the heat transfer of the hot nozzle and the nozzle head to molten plastic and further affecting the flowability of the plastic.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hot runner system and hot mouth subassembly has improved hot mouth heat, makes the plastic keep in the molten state, has better smoothness nature.

In order to realize one of the above objects of the present invention, an embodiment of the present invention provides a hot runner system, the hot runner system includes a flow distribution plate, a lower mold plate, a hot nozzle assembly, a flow distribution plate runner, a hot nozzle assembly, a hot runner, a beryllium copper bush, and a heater, wherein the heater and the beryllium copper bush are disposed on the periphery of the beryllium copper bush, the periphery of the beryllium copper bush fits the heater, and the inner periphery of the beryllium copper bush fits the hot nozzle.

As a further improvement of an embodiment of the present invention, the hot nozzle includes a hot nozzle body and a nozzle tip coaxially disposed with the hot nozzle, the hot runner includes an upper runner disposed on the hot nozzle body and a lower runner disposed on the nozzle tip and communicated with the upper runner, and the partial heater surrounds the periphery of the hot nozzle body and the partial heater surrounds the periphery of the beryllium copper bush.

As a further improvement of an embodiment of the present invention, the beryllium copper bush includes an upper bush portion attached to the heater and a lower bush portion attached to the tip, the hot nozzle assembly further includes a sealing ring, and the sealing ring is located between the heater and the lower bush portion in a direction perpendicular to the longitudinal axis.

As an embodiment of the utility model is further improved, seal the rubber ring and include the installation department and from the lower extension of last installation department downwardly extending, go up the installation department with beryllium copper bush looks butt, and the periphery of going up the installation department with the heater is laminated mutually, lower extension with a determining deviation has between the beryllium copper bush.

As a further improvement of an embodiment of the present invention, the lower extension has a lower end remote from the upper mounting portion, and the lower extension is outwardly protruded adjacent to the lower end with a glue sealing position.

In order to achieve one of the above objects, another embodiment of the present invention further provides a hot nozzle assembly, the hot nozzle assembly having a hot runner, wherein the hot nozzle assembly includes a hot nozzle extending along a longitudinal axis, a heater sleeved on a part of the periphery of the hot nozzle, and a beryllium copper bush, and in a direction perpendicular to the longitudinal axis, a part of the periphery of the beryllium copper bush is attached to the heater, and an inner periphery of the beryllium copper bush is attached to the hot nozzle.

As a further improvement of an embodiment of the present invention, the inner diameter of the beryllium copper bush is smaller than the outer diameter of the tip, the outer diameter of the lower bush portion is larger than the inner diameter of a part of the sealing rubber ring, and the tip, the beryllium copper bush and the sealing rubber ring are assembled together by using the cryogenic splicing process to form a whole.

As a further improvement of an embodiment of the utility model, will mouth point, beryllium copper bush and seal the rubber ring and assemble together to become a whole after, a clamping of rethread is processed the guiding hole in the mouth point with seal the rubber position of rubber ring periphery.

Compared with the prior art, the beneficial effects of the utility model reside in that: because the hot nozzle component comprises the beryllium copper bush, in the direction vertical to the longitudinal axis, the outer periphery of part of the beryllium copper bush is jointed with the heater, and the inner periphery of the beryllium copper bush is jointed with the hot nozzle. The beryllium copper bush has high thermal conductivity, so that the heat of the hot nozzle is improved, the plastic is kept in a molten state, and the smoothness is better.

Drawings

FIG. 1 is a schematic illustration of a hot runner system in an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

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

FIG. 4 is an enlarged view of a portion of FIG. 1 at B;

FIG. 5 is an enlarged view of a portion of FIG. 1 at C;

FIG. 6 is an enlarged fragmentary view at C of FIG. 1 with the valve needle removed;

FIG. 7 is an enlarged top view of a hot tip of the hot runner system of FIG. 1;

FIG. 8 is an enlarged top view of the anti-rotation tab of the hot runner system of FIG. 1.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings. However, these embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art based on these embodiments are all included in the scope of the present invention.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Terms such as "upper," "above," "lower," "below," and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 8, the present invention provides a hot runner system, which includes an upper mold plate 10 and a cylinder assembly disposed on the upper mold plate 10. The cylinder assembly includes a cylinder tube 12 provided in an upper die plate 10, a piston 14 movably provided in the cylinder tube 12, an upper air chamber 16 located above the piston 14, and a lower air chamber 18 located below the piston 14, the upper die plate 10 is provided with an upper passage 20 communicating with the upper air chamber 16 and a lower passage 22 communicating with the lower air chamber 18, the cylinder tube 12 has an outer peripheral portion abutting against the piston 14 and an upper end portion 26 extending from an upper end of the outer peripheral portion to an inner side of the outer peripheral portion, the upper end portion 26 has an opening 24, and the upper end portion 26 is pressed by the upper die plate 10 by a predetermined amount of preload in a longitudinal direction parallel to a moving direction of the piston 14. Preferably, the end of the upper end 26 adjacent to the opening 24 is pressed against the upper platen 10, with some clearance between the rest of the upper end 26 and the upper platen 10. So arranged, cylinder 12 is pressed by upper die plate 10.

In the preferred embodiment, since the upper end 26 of the cylinder 12 is provided with the opening 24, the upper end 26 of the cylinder 12 can be pressed by the upper die plate 10 by a certain amount of pre-pressing, so as to realize the first re-sealing of the cylinder 12 in the longitudinal direction, and thus, in the longitudinal direction, no additional sealing ring is required, so that the structure is simple, the cost is low, and meanwhile, the more reliable sealing of the cylinder 12 in the longitudinal direction is realized.

Further, in a lateral direction perpendicular to the moving direction of the piston 14, the outer peripheral portion has a certain distance from the upper die plate 10, and a circumferential seal ring 28 is provided between the outer peripheral portion and the upper die plate 10. The circumferential sealing ring 28 is arranged, so that second resealing between the cylinder barrel 12 and the upper template 10 is realized, and the sealing performance is further enhanced. In this embodiment, because the first reseal is disposed between the cylinder 12 and the upper mold plate 10 in the longitudinal direction, and the second reseal is disposed between the cylinder 12 and the upper mold plate 10 in the transverse direction, the risk of air leakage caused by the processing error of the upper mold plate 10 and the deformation of the components is greatly reduced.

Specifically, the cylinder tube 12 further includes a protrusion 30 extending outward from the outer peripheral portion, the protrusion 30 has a protrusion slope, the upper die plate 10 has a die plate slope parallel to the protrusion slope, and the circumferential seal ring 28 is located between the protrusion slope and the die plate slope.

The upper die plate 10 comprises a bottom 32 pressed against the upper end 26 of the cylinder 12, an upper inner peripheral portion 34 and a lower inner peripheral portion 36 perpendicular to the bottom 32, wherein the upper inner peripheral portion 34 is connected with the bottom 32, the inner diameter of the upper inner peripheral portion 34 is smaller than that of the lower inner peripheral portion 36, and a die plate inclined surface is obliquely downward from the inner peripheral portion to connect the upper inner peripheral portion 34 and the lower inner peripheral portion 36.

Further, upper passageway 20 communicates with upper air chamber 16 through opening 24. So set up, need not open the hole that is linked together with last passageway 20 in addition again in other parts of cylinder 12, opening 24 on the cylinder 12 has realized that cylinder 12 can be by certain pre-compaction volume of cope match-plate pattern 10 pre-compaction in vertical, when reaching axial seal, has still realized the intercommunication between last passageway 20 and the last air cavity 16 for overall structure is simpler.

Further, the centerline of the opening 24 coincides with the longitudinal axis of the piston 14.

The upper passageway 20 includes a longitudinally extending vertical section in communication with the upper plenum 16 through an opening 24 and a transversely extending horizontal section in communication with the vertical section. In particular, the vertical section has a cross-sectional radius that is less than the radius of the opening 24. Further, the vertical section has a cross-sectional radius that is less than one third of the radius of the opening 24.

The cylinder assembly further includes a back support member 38 fixedly disposed relative to the upper die plate 10, the back support member 38, the bore 12 and the piston 14 defining the lower chamber 18.

The upper die plate 10 is provided with a receiving space 40, and the cylinder 12 is located in the receiving space 40. The back support 38 is located outside the receiving space 40, the back support 38 abuts against the upper mold plate 10, and the back support 38 is located completely outside the upper mold plate 10.

In addition, an intake gap is provided between the back support 38 and the cylinder tube 12, and the intake gap communicates with the lower passage 22.

In the longitudinal direction, the cylinder tube 12 abuts against the back support 38, the back support 38 is provided with an inlet slot 42 facing the cylinder tube 12, and the lower channel 22 communicates with the lower air chamber 18 through the inlet slot 42.

Further, the back support 38 has a lower recess 44, the cylinder 12 abuts against the bottom of the lower recess 44, a certain distance is provided between the cylinder 12 and the side of the lower recess 44, and the air inlet groove 42 is disposed in the lower recess 44.

In the lateral direction, the cylinder tube 12 is spaced from the back support 38. This provides room for deformation of the cylinder 12, facilitating the upper die plate 10 to press the upper end 26 of the cylinder 12 in the longitudinal direction.

The piston 14 is provided with a recess 46 at the side facing the lower air chamber 18. So arranged, on the one hand, the weight of the piston 14 is reduced and, on the other hand, the space of the lower air chamber 18 is somewhat increased. Preferably, the groove 46 is annular.

A piston sealing ring 48 is arranged between the piston 14 and the side wall of the cylinder 12, specifically, an annular accommodating groove 50 is arranged on the periphery of the piston 14, the piston sealing ring 48 is positioned in the annular accommodating groove 50, and the outer ring of the piston sealing ring 48 is attached to the side wall of the cylinder 12.

Further, the hot runner system further includes a valve needle 52 disposed on the piston 14, the valve needle 52 extends lengthwise along the longitudinal direction, and the valve needle 52 is driven by the piston 14 to reciprocate up and down. The cylinder assembly further comprises a needle fastener 54 fixed to the piston 14, and the maximum distance between the needle fastener 54 and the upper die plate 10 in the longitudinal direction can be adjusted to adjust the output of the plastic. In particular, in the present embodiment, the needle fastening member 54 is a needle fastening bolt including a threaded portion 56 fixedly coupled to the piston 14 and a head portion 58 protruding from the piston 14, and the needle fastening member 54 is selectively replaceable to replace the needle fastening member 54 having a different thickness L1 of the head portion 58, thereby adjusting the maximum distance L2 between the needle fastening member 54 and the upper mold plate 10.

The back support 38 is provided with a dirt discharge groove 60, and the valve needle 52 is provided with a groove 62 on the outer periphery thereof, the groove 62 communicating with the dirt discharge groove 60 when the valve needle 52 is moved in a certain position in the longitudinal direction, and preferably, the groove 62 communicating with the dirt discharge groove 60 when the valve needle 52 is moved to the uppermost position. Specifically, in the present embodiment, two grooves 62 are spaced apart from each other on the outer circumference of the valve needle 52 in the longitudinal direction, and the distance between the two grooves 62 in the longitudinal direction is smaller than the diameter of the drainage groove 60. Specifically, the drainage groove 60 extends in a transverse direction perpendicular to the longitudinal direction.

The hot runner system further comprises a flow distribution plate 64, a lower template 66 and a hot nozzle assembly fixedly arranged relative to the lower template 66, wherein a flow distribution plate flow passage 68 is arranged on the flow distribution plate 64, the hot nozzle assembly is provided with a hot runner 70 communicated with the flow distribution plate flow passage 68, the valve needle 52 penetrates through part of the flow distribution plate flow passage 68 and extends through the hot runner 70, and the valve needle 52 can be driven by the piston 14 to reciprocate up and down in the hot runner 70.

The hot runner system also includes a valve pin guide sleeve 72 fixedly attached to the manifold plate 64. in the preferred embodiment, the valve pin guide sleeve 72 is threadably attached to the manifold plate 64. Of course, other connections between the needle guide sleeve 72 and the diverter plate 64 are possible, and the needle guide sleeve 72 includes a threaded portion 74 connected to the diverter plate 64 and an upper guide portion 76 protruding beyond the diverter plate 64, the upper guide portion 76 being located at the inner periphery of the back support 38, and the piston 14 abutting against the upper guide portion 76 when the needle 52 is at the lowermost end. Longitudinally, the backing support 38 is located between the upper die plate 10 and the manifold 64. The upper guide portion 76 is provided with a coupling groove 78 which is communicated with the drainage groove 60, and when the valve pin 52 is moved in a certain position in the longitudinal direction, the groove 62 is communicated with the coupling groove 78, so that the plastic and iron chips in the groove 62 are discharged into the drainage groove 60 through the coupling groove 78. More or less clearance exists between the valve needle 52 and the valve needle guide sleeve 72, the groove 62 is used for containing carbonized plastics, wear scrap iron and other dirt, when the valve needle 52 moves upwards, the groove 62 is communicated with the dirt discharge groove 60 through the connecting groove 78 to discharge the dirt, so that the valve needle 52 is prevented from being stuck, and the smoothness of the movement of the valve needle 52 is ensured.

Further, two seals are provided between the back support 38 and the diverter plate 64, including an inner seal 80 and an outer seal 82 having an inner diameter greater than the inner seal 80, wherein the outer seal 82 is located between the back support 38 and the diverter plate 64, and the inner seal 80 is located between the back support 38 and the needle guide sleeve 72. In this embodiment, two seals are provided between the back support 38 and the manifold 64, which greatly reduces the risk of glue spillage in the hot runner system by using a dual seal configuration.

The hot nozzle assembly comprises a hot nozzle 84 extending along a longitudinal axis, and at least one layer of spring ring 86 sleeved on the periphery of the hot nozzle 84, wherein in the extending direction of the longitudinal axis, one end of the spring ring 86 abuts against the hot nozzle 84 on the flow distribution plate 64, the other end of the spring ring 86 abuts against the lower template 66, and the radius of the central hole of the spring ring 86 is kept consistent. Different numbers of spring rings can be arranged according to actual needs, such as one layer, two layers or more than two layers.

At room temperature, after the hot nozzle assembly is installed, the spring ring 86 is pre-pressed by a certain amount, and after the hot runner system is heated and heated, the spring ring 86 is further compressed due to the thermal expansion factor, so that the hot nozzle 84 can be tightly attached to the flow distribution plate 64, and glue leakage is prevented. On the other hand, the amount of thermal expansion is absorbed by the spring ring 86, thereby preventing the lower die plate 66 from being deformed.

Specifically, the spring ring 86 of this embodiment adopts multilayer spring ring 86 structure, has further improved compressive strength, has guaranteed to be laminated more closely between hot mouth 84 and the subchannel, has reduced the hot runner system and has leaked gluey risk.

The entire outer circumference of the spring ring 86 does not contact any component parts in a direction perpendicular to the longitudinal axis. Thereby providing room for the spring ring 86 to deform without interference as the spring ring 86 deforms.

Further, the hot nozzle assembly further comprises a hot nozzle positioning ring 88, and the hot nozzle positioning ring 88 is positioned between the lower template 66 and the spring ring 86 in the extension direction of the longitudinal axis. The lower template 66 is provided with a containing groove 90, and the hot nozzle positioning ring 88 is positioned in the containing groove 90.

In the embodiment, the nozzle positioning ring 88 includes a support portion 92 and an abutting portion 94 extending from the support portion 92 to the inner ring of the support portion 92, the support portion 92 abuts against the lower mold plate 66 in the extending direction of the longitudinal axis, and the abutting portion 94 abuts against the outer periphery of the nozzle 84 in the direction perpendicular to the longitudinal axis. An abutment 94 extends inwardly from the upper extremity of the support 92. A hot nozzle locating collar 88 locates the hot nozzle 84 and the lower platen 66.

In the direction perpendicular to the longitudinal axis, one part of the support portion 92 abuts against the lower die plate 66, and the other part of the support portion 92 has a certain gap with the lower die plate 66. Specifically, in a direction perpendicular to the longitudinal axis, the outer periphery of the lower end of the support portion 92 abuts against the side of the receiving groove 90, and a gap is formed between the other portion of the support portion 92 and the side of the receiving groove 90, so that the heat on the hot nozzle 84 is reduced from being transferred to the lower die plate 66 through the hot nozzle positioning ring 88.

The hot nozzle assembly further includes a spring ring positioning bushing 96, the spring ring positioning bushing 96 including a peripheral portion 98 surrounding the periphery of the hot nozzle 84, the peripheral portion 98 being positioned between the hot nozzle 84 and the spring ring 86 in a direction perpendicular to the longitudinal axis to compress the hot nozzle 84 against the manifold plate 64. Further, in a direction perpendicular to the longitudinal axis, the peripheral portion 98 is also located between the abutment portion 94 and the hot tip 84, the abutment portion 94 abutting against the peripheral portion 98.

The spring ring retention bushing 96 further includes an outer extension 100 extending outwardly from the peripheral portion 98, the outer extension 100 being located between the spring ring 86 and the hot tip 84 in the direction of extension of the longitudinal axis. Further, an outer extension 100 extends outwardly from an upper end of the peripheral portion 98. The spring ring positioning bushing 96 provided by this embodiment greatly reduces heat loss at the upper end of the hot nozzle 84, and ensures temperature equalization in the hot nozzle 84.

The hot tip assembly also includes anti-rotation features disposed on the lower platen 66 and the hot tip 84 that prevent the hot tip 84 from rotating about the longitudinal axis. Specifically, in the present embodiment, the anti-rotation structure includes an anti-rotation tab 102 sleeved on the hot nozzle 84 and an anti-rotation pin 104 for fixing the anti-rotation tab 102 to the lower mold plate 66. The anti-rotation tab 102 has a rotation stop plane and the hot tip 84 has a mating plane that mates with and conforms to the rotation stop plane, thereby preventing rotation of the hot tip 84 about the longitudinal axis.

Further, the hot nozzle assembly further comprises a heater 106 sleeved on part of the outer periphery of the hot nozzle 84, and a beryllium copper bush 108, wherein in the direction perpendicular to the longitudinal axis, part of the outer periphery of the beryllium copper bush 108 is abutted to the heater 106, and the inner periphery of the beryllium copper bush 108 is abutted to the hot nozzle 84.

In the preferred embodiment, because the hot nozzle assembly includes beryllium copper bushing 108, and in a direction perpendicular to the longitudinal axis, a portion of the outer periphery of beryllium copper bushing 108 abuts heater 106 and the inner periphery of beryllium copper bushing 108 abuts hot nozzle 84. Beryllium copper bushing 108 has a high thermal conductivity to improve the heat from hot tip 84 and to keep the plastic in a molten state for better flow.

The hot nozzle 84 comprises a hot nozzle body 110 and a nozzle tip 112 which is arranged coaxially with the hot nozzle 84, the hot runner 70 comprises an upper runner 114 arranged on the hot nozzle body 110 and a lower runner 116 arranged on the nozzle tip 112 and communicated with the upper runner 114, a part of the heater 106 surrounds the periphery of the hot nozzle body 110, and a part of the heater 106 surrounds the periphery of the beryllium copper bush 108. The lower end of the nozzle tip 112 is further provided with a guide hole 118 communicated with the lower flow passage 116, the guide hole 118 forms a glue discharging gate, the inner diameter of the guide hole 118 is matched with the circumference diameter of the valve pin 52, and the valve pin 52 is driven by the piston 14 to move up and down in the hot runner 70 along the extension direction of the longitudinal axis so as to adjust the glue discharging amount of the gate. It is described above that the valve pin fasteners 54 can be selectively replaced to replace valve pin fasteners 54 having different thicknesses L1 of the head portion 58 to adjust the maximum distance L2 between the valve pin fasteners 54 and the upper mold plate 10 so that the valve pins 52 open the gate differently to control the plastic output.

The beryllium copper sleeve 108 includes an upper sleeve portion 120 that engages the heater 106 and a lower sleeve portion 122 that engages the tip 112, and the hot tip assembly further includes an adhesive ring 124, the adhesive ring 124 being positioned between the heater 106 and the lower sleeve portion 122 in a direction perpendicular to the longitudinal axis. Further, a step is formed between the lower bushing portion 122 and the upper bushing portion 120, that is, the inner bore diameter of the lower bushing portion 122 is smaller than the inner bore diameter of the upper bushing portion 120, and the step abuts against the upper end of the tip 112.

The inner bore diameter of the beryllium copper bush 108 is smaller than the outer bore diameter of the nozzle tip 112, the outer bore diameter of the lower bush part 122 is larger than the inner bore diameter of a part of the rubber sealing ring 124, and the nozzle tip 112, the beryllium copper bush 108 and the rubber sealing ring 124 are assembled together by using a deep cold splicing process to form an integral device. Finally, the integrated device is mounted to the hot nozzle 84, wherein the beryllium copper bush 108 is internally threaded at a portion of the inner ring of the upper bush portion 120, and the integrated device is mounted to the hot nozzle body 110 by screwing the beryllium copper bush 108 to the hot nozzle body 110. When the nozzle tip is installed at the final position, in the extending direction of the longitudinal axis, the nozzle tip 112 is abutted against the hot nozzle body 110, and a certain gap is formed between the beryllium copper bush 108 and the hot nozzle 84, so that the nozzle tip 112 is ensured to be well attached to the hot nozzle body 110, the upper flow passage 114 of the hot nozzle body 110 is tightly communicated with the lower flow passage 116 of the nozzle tip 112, and glue leakage between the hot nozzle body 110 and the nozzle tip 112 is avoided.

At normal temperatures, the mounting must be such that the hole is larger than the shaft size, which can cause loosening. In the preferred embodiment, a deep cold splicing process is adopted, the principle of thermal expansion and cold contraction is utilized, the size of the shaft is designed to be larger than that of the hole, specifically, the inner aperture of the beryllium copper bush 108 is smaller than that of the nozzle tip 112, the outer aperture of the lower bush portion 122 is larger than that of the partial sealing rubber ring 124, under the condition of low temperature, the outer aperture of the nozzle tip 112 is shrunk and then assembled into the inner hole of the beryllium copper bush 108, the outer aperture of the lower bush portion 122 is shrunk and then assembled into the inner hole of the partial sealing rubber ring 124, and then the shaft is placed at normal temperature, the shrunk amount of the outer aperture of the nozzle tip 112 is reduced and then closely matched with the inner hole of the beryllium copper bush 108, and the shrunk amount of the outer aperture of the lower bush portion 122 is reduced and then closely matched with the inner hole of the partial sealing rubber ring 124, so that the beryllium copper bush 108, the nozzle tip and the sealing rubber ring 124 are assembled together to form a whole.

In the preferred embodiment, the hot nozzle body 110 and the beryllium copper bushing 108 are both comprised of beryllium copper, which is highly thermally conductive, and the nozzle tip 112 is typically comprised of a high strength, high wear resistance steel material such as 2316. The packing rubber 124 is made of a material with low thermal conductivity, such as titanium alloy, W302, etc.

The hot runner system further includes a mold (not shown) having a mold hole for cooperating with the sealing ring 124, the sealing ring 124 is used to prevent the plastic at the gate from leaking toward the hot nozzle 84. In addition, since the rubber sealing ring 124 is matched with the mold, the heat of the hot nozzle 84 and the beryllium copper bush 108 is prevented from being transmitted to the mold through the rubber sealing ring 124 to cause heat loss, and therefore, the rubber sealing ring 124 is made of a material with low heat conductivity.

The rubber sealing ring 124 comprises an upper mounting portion 126 and a lower extension portion 128 extending downwards from the upper mounting portion 126, the upper mounting portion 126 is abutted with the beryllium copper bush 108, the periphery of the upper mounting portion 126 is abutted with the heater 106, and a certain distance is reserved between the lower extension portion 128 and the beryllium copper bush 108. Due to the spacing between the lower extension 128 and the beryllium copper sleeve 108, heat transfer from the beryllium copper sleeve 108 to the mold is avoided.

The lower extension 128 has a lower end distal from the upper mounting portion 126, and the lower extension 128 projects outwardly adjacent the lower end with a glue location 130. The glue sealing position 130 is matched with the die hole, and except that the glue sealing position 130 is contacted with the die, other parts of the glue sealing ring 124 are not contacted with the die, so that the heat transferred to the die is greatly reduced.

In the preferred embodiment, the nozzle tip 112, the beryllium copper bush 108 and the sealing rubber ring 124 are assembled together to form a whole, and then the guide hole 118 in the nozzle tip 112 and the sealing rubber position 130 on the periphery of the sealing rubber ring 124 are machined by one-time clamping. By the aid of the processing technology, the guide hole 118 and the glue sealing position 130 are processed through one-time clamping, and high coaxial precision of the guide hole 118 and the glue sealing position 130 is guaranteed.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of detailed descriptions is only for the specific description of the feasible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present invention should be included within the scope of the present invention.

Claims

1. The hot runner system is characterized in that the hot nozzle assembly comprises a hot nozzle extending along a longitudinal axis, a heater sleeved on part of the periphery of the hot nozzle and a beryllium copper bush, the periphery of part of the beryllium copper bush is attached to the heater in the direction vertical to the longitudinal axis, and the inner periphery of the beryllium copper bush is attached to the hot nozzle.

2. The hot runner system according to claim 1, wherein the hot nozzle comprises a hot nozzle body and a nozzle tip arranged coaxially with the hot nozzle, the hot runner comprises an upper flow passage arranged on the hot nozzle body and a lower flow passage arranged on the nozzle tip and communicated with the upper flow passage, a part of the heater surrounds the periphery of the hot nozzle body, and a part of the heater surrounds the periphery of the beryllium copper bush.

3. The hot-runner system of claim 2, wherein the beryllium copper bushing includes an upper bushing portion that abuts the heater and a lower bushing portion that abuts the tip, the hot tip assembly further including an adhesive sealing ring positioned between the heater and the lower bushing portion in a direction perpendicular to the longitudinal axis.

4. The hot-runner system of claim 3, wherein the rubber sealing ring comprises an upper mounting portion and a lower extension portion extending downward from the upper mounting portion, the upper mounting portion abuts the beryllium copper bushing, a periphery of the upper mounting portion abuts the heater, and a space is provided between the lower extension portion and the beryllium copper bushing.

5. The hot-runner system of claim 4, wherein the lower extension has a lower end distal from the upper mounting portion, the lower extension projecting outwardly adjacent the lower end with a glue location.

6. The hot nozzle assembly is provided with a hot runner and is characterized by comprising a hot nozzle extending along a longitudinal axis, a heater sleeved on part of the periphery of the hot nozzle, and a beryllium copper bush, wherein in the direction perpendicular to the longitudinal axis, part of the periphery of the beryllium copper bush is attached to the heater, and the inner periphery of the beryllium copper bush is attached to the hot nozzle.

7. The hot nozzle assembly as claimed in claim 6, wherein the hot nozzle comprises a hot nozzle body and a nozzle tip arranged coaxially with the hot nozzle, the hot runner comprises an upper flow passage arranged on the hot nozzle body and a lower flow passage arranged on the nozzle tip and communicated with the upper flow passage, a part of the heater surrounds the periphery of the hot nozzle body, and a part of the heater surrounds the periphery of the beryllium copper bush.

8. The hot nozzle assembly as claimed in claim 7, wherein said beryllium copper bushing includes an upper bushing portion attached to said heater and a lower bushing portion attached to said nozzle tip, said hot nozzle assembly further including an adhesive sealing ring, said adhesive sealing ring being positioned between said heater and said lower bushing portion in a direction perpendicular to said longitudinal axis.

9. The hot nozzle assembly of claim 8, wherein the beryllium-copper bushing has an inner bore diameter smaller than an outer diameter of the nozzle tip, the lower bushing portion has an outer diameter larger than an inner bore diameter of a portion of the sealing rubber ring, and the nozzle tip, the beryllium-copper bushing and the sealing rubber ring are assembled together as a whole by a cryogenic splicing process.

10. The hot nozzle assembly as claimed in claim 8, wherein the nozzle tip, the beryllium copper bush and the sealant ring are assembled together to form a whole, and then the guide hole in the nozzle tip and the sealant position on the periphery of the sealant ring are machined by one-time clamping.