CN112277263A - Hot runner system multi-head nozzle realized by internal heating principle - Google Patents
Hot runner system multi-head nozzle realized by internal heating principle Download PDFInfo
- Publication number
- CN112277263A CN112277263A CN202011210057.6A CN202011210057A CN112277263A CN 112277263 A CN112277263 A CN 112277263A CN 202011210057 A CN202011210057 A CN 202011210057A CN 112277263 A CN112277263 A CN 112277263A
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- nozzle
- nozzle body
- heater
- products
- hot runner
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Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 8
- 244000309464 bull Species 0.000 claims description 3
- 239000003292 glue Substances 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000007514 turning Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
- B29C2045/2743—Electrical heating element constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C2045/2761—Seals between nozzle and mould or gate
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the field of hot runners, in particular to a multi-head nozzle of a hot runner system, which is realized by an internal heating principle and comprises a nozzle body, a plurality of nozzle tips, a pouring gate driver, an insert, a temperature sensing line, a heater and a spring, wherein the heater is embedded in the center of the nozzle body; a plurality of runners are arranged in the nozzle body, each runner is provided with an independent sprue ejector and a shunting shuttle, independent products can be injected or one product can be injected simultaneously, the number of the runners and the spacing between the products can be densely arranged, the glue feeding of the products can be balanced, the pressure is consistent, the production speed of the products is greatly improved, and the precision and the quality of the products are also effectively improved; the risk of glue leakage of the nozzle is reduced, and the phenomenon that a plurality of accessories of the traditional structure are matched through threads is eliminated; the maintenance and the replacement are simpler and quicker, and the influence on the production is extremely small.
Description
Technical Field
The invention relates to the technical field of hot runners, in particular to a multi-head nozzle of a hot runner system, which is realized by an internal heating principle.
Background
Hot runner (hot runner) is used in injection molds, and is a method of insulating or heating the runner system of an injection mold to keep the plastic melt in a molten state all the time, thereby avoiding the generation of runner system congealing. The application of the hot runner technology can save raw materials and reduce the cost; the molding period is shortened, and the machine efficiency is improved; improve the surface quality and mechanical property of the product. The hot runner system can be divided into an internal heating type hot runner system and an external heating type hot runner system according to different heat compensation modes, and the internal heating type hot runner system is rarely researched in China.
A common external heating type hot runner system is shown in figure 4 and comprises a nozzle body 1, a spring type heating ring 2, a core body sleeve 3, a nozzle core 4, a clamp spring 5, a sealing ring 6, a nozzle cavity opening plate 7 of a mold, a flow distribution plate 8 and a main nozzle 9. Nozzle body 1 is interference fit with spring heating coil 2, and nozzle body 1 and jump ring 5 are that little clearance fit passes through threaded connection, overlaps nozzle core 4 behind spring heating coil 2 outside, and the jump ring of opening chamber board 7 with the nozzle of mould blocks it, and main nozzle 9 and nozzle body 1 all are bolted connection, and the shortcoming of this kind of structure is: the system temperature is almost equivalent to the plastic processing temperature, the heat loss is large, and good measures are required; the structural components of the device can generate thermal expansion from room temperature to working temperature, the thermal expansion in the structure must be estimated during installation and debugging, compensated installation is carried out at room temperature, the successful debugging at the working temperature can be ensured, and the installation process is complex; and must have good sealing effect, if design, processing, assembly, injection technology are improper etc. all probably cause the hourglass glue, probably cause the mould to damage in the serious occasion, even lead to the off-production.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the system temperature is almost equal to the plastic processing temperature, the heat loss is large, and good measures are required to be adopted; the structural components of the device can generate thermal expansion from room temperature to working temperature, the thermal expansion in the structure must be estimated during installation and debugging, compensated installation is carried out at room temperature, the successful debugging at the working temperature can be ensured, and the installation process is complex; and must have good sealed effect, if design, processing, assembly, injection technology are improper etc. all probably cause the glue leakage, may cause the mould to damage in the serious case, even lead to the shortcoming of stopping production, and the hot runner system bull nozzle that provides realizes through the internal heating principle.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a hot runner system bull nozzle through inside heating principle realizes, includes nozzle body, a plurality of mouth points, runner department, mold insert, temperature sensing line, heater and spring, the heater is embedded in the center of nozzle body, and the mold insert is located nozzle body bottom inboard and is interference fit with the nozzle body, and the bottom of nozzle body is located to the runner department, and the inside of nozzle body is located to the temperature sensing line, and the mouth point is located the runner department.
Preferably, a plurality of flow channels are arranged in the nozzle body, and a plurality of nozzle tips are respectively and fixedly communicated with the plurality of flow channels.
Preferably, the heater is connected with a lead wire, the spring is fixedly installed on the nozzle body, and the spring is sleeved outside the lead wire.
Compared with the prior art, the invention has the beneficial effects that:
the plastic melt is injected into the main sprue of the nozzle through the nozzle of the injection molding machine, the melt flows into each runner of the nozzle body through the main sprue of the nozzle and enters the nozzle tip, each nozzle tip can be used for injecting an independent cavity, the production speed of products is greatly improved corresponding to independent products, one product can be simultaneously injected, the roundness of the products is not influenced, and the quality of cylindrical products is effectively improved; the nozzle body is internally provided with heat by the heater, so that plastic can flow in a molten state all the time in the whole system, and each nozzle tip is independently sealed by the pouring gate to play a role of first layer of sealing; the front section of the nozzle body is provided with a second layer of sealing glue, and the tail end of the nozzle body has the functions of positioning and sealing a third layer; the problems of glue leakage caused by the glue sealing problem of the traditional system, damage to heating components caused by the glue leakage problem and the like are thoroughly solved;
the processing technology is simple, special materials are not used, and the cost is low; the volume is small, and the interference of cooling water, screw hole inserts and the like is not easy to occur; can be flexibly designed according to the size of the die; the most obvious advantage of the invention is that the internal heater is directly utilized for heating, the driving power supply is about 50 percent of the external heating system, the whole system is continuously heated, so that the distance between the nozzle and the sprue is quickly covered, and the fusion and solidification of the plastic raw materials are close to the outer wall of the runner, so that the system plays roles of heat insulation and sealing; because the cooled plastic layer has excellent thermal insulation protection performance, the hot runner system has small influence on the temperature of the die.
The invention has simple structure, convenient manufacture and installation, difficult interference with a die and high flexibility; a plurality of runners are arranged in the nozzle body, each runner is provided with an independent sprue ejector and a separate runner shuttle, independent products are injected or the same product is injected simultaneously, the number of the runners and the spacing between the products can be densely arranged, the glue feeding of the products can be balanced, the pressure is consistent, the production speed of the products is greatly improved, and the precision and the quality of the products are also effectively improved; the risk of glue leakage of the nozzle is reduced, and the phenomenon that a plurality of accessories of the traditional structure are matched through threads is eliminated; the maintenance and the replacement are simpler and quicker, and the influence on the production is extremely small.
Drawings
FIG. 1 is a schematic structural diagram of a multi-headed nozzle of a hot runner system according to the present invention, which is realized by the internal heating principle;
FIG. 2 is a schematic front view of a multi-headed nozzle of a hot runner system according to the present invention, which is realized by the internal heating principle;
FIG. 3 is a schematic top view of a multi-headed nozzle of a hot runner system according to the present invention, which is realized by the internal heating principle;
fig. 4 is a schematic structural view of a conventional hot runner system.
In the figure: 1 nozzle body, 2 nozzle tips, 3 sprue runners, 4 inserts, 5 temperature-sensing lines, 6 heaters and 7 springs.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-4, a multi-head nozzle of a hot runner system realized by an internal heating principle comprises a nozzle body 1, a plurality of nozzle tips 2, a gate driver 3, an insert 4, a temperature sensing wire 5, a heater 6 and a spring 7, wherein the heater 6 is embedded in the center of the nozzle body 1, the insert 4 is arranged at the inner side of the bottom of the nozzle body 1 and is in interference fit with the nozzle body 1, the gate driver 3 is arranged at the bottom of the nozzle body 1, the temperature sensing wire 5 is arranged inside the nozzle body 1, the nozzle tips 2 are arranged in the gate driver 3, the temperature sensing wire 5 adopts an external needle type temperature sensing wire, and has flexibility and replaceability, the heater 6 is arranged inside the nozzle body 1 and serves as a heating element to drive the temperature of the nozzle tips 2 of the nozzle body 1 to be in a melting state so as to enable media in a flow channel, the heater 6 is detachable and convenient to replace and maintain, and the nozzle tips 2 can, when the nozzle insert 4 is assembled with the nozzle body 1, the nozzle body 1 is heated, the nozzle insert 4 is cooled, and then the nozzle insert 4 is pressed into the nozzle body 1.
In the invention, the heater 6 is in a heating rod form and is provided with the temperature sensing wire 5, the heating is uniform, the reliability is strong, the lead wire resists high temperature of more than 400 ℃, the surface temperature of the heater 6 can reach 700 ℃, the use requirement of all plastic material sol is ensured, the heater 6 is embedded in the center of the nozzle body 1, the characteristic of uniform heating is exerted, the nozzle body 1 is made of a material with good thermal conductivity and corrosion resistance strength, and the nozzle has a plurality of flow channels and a multiple-sealing function.
In the invention, a plurality of flow channels are arranged in a nozzle body 1, a plurality of nozzle tips 2 are respectively and fixedly communicated with the plurality of flow channels, and the same temperature sensing line 5 is used in each flow channel; and the temperature sensing line has detachability, conveniently changes the maintenance.
In the invention, a lead wire is connected to the heater 6, the spring 7 is fixedly arranged on the nozzle body 1, the spring 7 is sleeved outside the lead wire, and the lead wire of the heater 6 is protected by the high-temperature resistant spring 7.
The processing process of the invention is as follows:
step 1: the nozzle body 1 is made of steel with good thermal conductivity, and allowance is left in rough turning; after quenching, drilling a heater to install a deep hole and a plurality of runner holes;
step 2: the nozzle tip 2 is made of a material with high heat conductivity and high wear resistance, so that the nozzle tip is ensured not to be corroded by the material; roughly turning and reserving allowance, and processing the runner hole by adopting a finishing carving machine; after quenching, finish machining to the required size; polishing the flow channel by adopting a fluid polishing machine;
and step 3: the sprue bush 3 is quenched by a material with good wear resistance and heat insulation and then is subjected to finish machining to the size of the drawing, so that the sprue bush and the die have a heat insulation effect;
and 4, step 4: the nozzle insert 4 is made of a high-heat-conductivity material and is processed to the size required by a drawing;
and 5: the heater 6 is stably arranged from the reverse side of the nozzle body 1, and the lead part penetrates through the spring to protect leakage; the heater 6 is mounted in place, and the size is detected and the next process is confirmed.
Step 6: the nozzle insert 4 is subjected to fine machining until the external dimension of the nozzle insert is larger than the dimension of the nozzle body and is subjected to interference fit; heating the nozzle body 1 to 500 ℃ by using a heating jig, cooling the nozzle insert 4 by using liquefied nitrogen at negative 600 ℃ for 30 minutes, and taking out; pressing the nozzle insert 4 into the nozzle body 1 by using a hydraulic press according to a hot-fitting principle; cooling; finishing the preliminary processing of the nozzle;
and 7: checking the dimension, parallelism, coaxiality, verticality and the like with tolerance on the drawing, assembling according to a correct method, checking the total dimension of the assembly after assembling, and strictly controlling the total dimension within the tolerance range.
In the invention, during operation, a plastic melt is injected into a nozzle main gate through a nozzle of an injection molding machine, the melt flows into each flow channel of a nozzle body 1 through the nozzle main gate and enters a nozzle tip 2, each nozzle tip 2 is injected with an independent cavity or the same product cavity, corresponding to an independent product, the production speed of the product is greatly improved, the nozzle body 1 needs to provide heat by a heater 6, so that the plastic can flow in a molten state in the whole system all the time, each nozzle tip 2 is independently sealed by a gate driver 3, and a first layer of sealing glue is formed; the front section of the nozzle body 1 is provided with a second layer of sealing glue, and the tail end of the nozzle body 1 has the functions of positioning and sealing a third layer; the problems of glue leakage caused by the glue sealing problem of the traditional system, damage to heating components caused by the glue leakage problem and the like are thoroughly solved; the processing technology is simple, special materials are not used, and the cost is low; the volume is small, and the interference of cooling water, screw hole inserts and the like is not easy to occur; can be flexibly designed according to the size of the die; the adopted processing technology is extremely innovative, the nozzle body 1 is heated by using a method of expansion with heat and contraction with cold, and the insert 4 is cooled to better exert interference fit and thermal fit; because the cooled plastic layer has excellent thermal insulation protection performance, the hot runner system has small influence on the temperature of the die.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. The utility model provides a hot runner system bull nozzle through inside heating principle realizes, includes nozzle body (1), a plurality of mouth points (2), runner department (3), mold insert (4), temperature sensing line (5), heater (6) and spring (7), its characterized in that, heater (6) are embedded in the center of nozzle body (1), and mold insert (4) are located nozzle body (1) bottom inboard and are interference fit with nozzle body (1), and the bottom of nozzle body (1) is located in runner department (3), and the inside of nozzle body (1) is located in temperature sensing line (5), and mouth point (2) are located runner department (3).
2. The multi-head nozzle of the hot runner system realized by the internal heating principle according to claim 1 is characterized in that a plurality of flow channels are arranged in the nozzle body (1), and a plurality of nozzle tips (2) are respectively and fixedly communicated with the plurality of flow channels.
3. The hot runner system multi-head nozzle realized by the internal heating principle according to claim 1 is characterized in that a lead wire is connected to the heater (6), the spring (7) is fixedly installed on the nozzle body (1), and the spring (7) is sleeved outside the lead wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011210057.6A CN112277263A (en) | 2020-11-03 | 2020-11-03 | Hot runner system multi-head nozzle realized by internal heating principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011210057.6A CN112277263A (en) | 2020-11-03 | 2020-11-03 | Hot runner system multi-head nozzle realized by internal heating principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112277263A true CN112277263A (en) | 2021-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011210057.6A Pending CN112277263A (en) | 2020-11-03 | 2020-11-03 | Hot runner system multi-head nozzle realized by internal heating principle |
Country Status (1)
| Country | Link |
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| CN (1) | CN112277263A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603789A (en) * | 2022-03-17 | 2022-06-10 | 山东春雨节水灌溉设备有限公司 | One-point hot nozzle and machining process |
-
2020
- 2020-11-03 CN CN202011210057.6A patent/CN112277263A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603789A (en) * | 2022-03-17 | 2022-06-10 | 山东春雨节水灌溉设备有限公司 | One-point hot nozzle and machining process |
| CN114603789B (en) * | 2022-03-17 | 2023-11-28 | 山东春雨节水灌溉设备有限公司 | One-outlet multi-point hot nozzle and processing technology |
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