CN111890641A - Telescopic hot runner structure, injection mold and working method of injection mold - Google Patents
Telescopic hot runner structure, injection mold and working method of injection mold Download PDFInfo
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- CN111890641A CN111890641A CN202010842094.2A CN202010842094A CN111890641A CN 111890641 A CN111890641 A CN 111890641A CN 202010842094 A CN202010842094 A CN 202010842094A CN 111890641 A CN111890641 A CN 111890641A
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- 238000002347 injection Methods 0.000 title claims abstract description 71
- 239000007924 injection Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001746 injection moulding Methods 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 46
- 230000007704 transition Effects 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 230000008859 change Effects 0.000 claims abstract description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 26
- 239000004033 plastic Substances 0.000 claims description 22
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 14
- 229920002530 polyetherether ketone Polymers 0.000 claims description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims 3
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- 238000011017 operating method Methods 0.000 claims 2
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- 239000003292 glue Substances 0.000 abstract description 7
- 239000012768 molten material Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 7
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Images
Classifications
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- 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
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C45/2602—Mould construction elements
-
- 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
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
- B29C2045/2709—Gates with a plurality of mould cavity inlets in close proximity
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of molds, and particularly discloses a telescopic hot runner structure, an injection mold and a working method thereof, the telescopic hot runner structure comprises a connecting hot nozzle and a first hot nozzle, a second hot nozzle capable of moving along the side line direction of the inner wall of the first hot nozzle is arranged in the first hot nozzle, a heating element is arranged on the second hot nozzle, one end of the second hot nozzle extends out of the opening of the first hot nozzle, the other end of the second hot nozzle is provided with a movable transition joint for stretching to change the length, a sealing element is sleeved on the movable transition joint, the temperature of the molten material is controlled by the heating element, further conveying the materials to the mold for injection molding through the movable transition joint, the first hot nozzle and the connecting hot nozzle in sequence, thereby meeting the moving distance requirements of different molds in opening and closing changes, meanwhile, the glue leakage condition is avoided through the sealing piece, and the problem that the glue leakage condition can occur in a hot runner structure adopted by a mold in the existing injection molding process is solved.
Description
Technical Field
The invention relates to the technical field of molds, in particular to a telescopic hot runner structure, an injection mold and a working method thereof.
Background
Injection molding is a method for producing moldings from industrial products, and materials are usually formed into various shapes by molding dies. At present, the injection molding technology is developed to the present day, and the technology of a plurality of injection molds is mature, so that a large number of products are provided for the society, and the life of people is enriched.
However, the current injection mold has some problems, for example, during the injection molding process, the runner part generates excessive water gaps (also called as soup gaps and gates), and these water gaps must be broken again and put into production, which affects the production efficiency, and simultaneously, due to the secondary processing of the material, the performance of the material is degraded, the strength of the product is affected, and the quality is affected. At present, in order to improve the above disadvantages, some injection molding molds have hot runners, which are mostly used in single-layer molds and control the ends of the runners using a needle valve type mechanism.
However, the above technical solutions have the following disadvantages in practical use: the mould among the current injection molding process, in order to solve the problem that the runner part produces unnecessary water gap, adopted hot runner structure mostly, nevertheless had the problem that often can appear leaking the gluey condition, the operator must in time clean, otherwise appears pressing the condition such as bad mould easily, is unfavorable for automatic, unmanned production.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a retractable hot runner structure, so as to solve the problem that glue leakage often occurs in a hot runner structure adopted by a mold in the prior injection molding process proposed in the background art.
The embodiment of the present invention is achieved by a telescopic hot runner structure, including a connecting hot nozzle for communicating with a mold, the telescopic hot runner structure further including:
the device comprises a first hot nozzle, a second hot nozzle and a heating element, wherein the first hot nozzle is internally provided with the second hot nozzle which can move along the side line direction of the inner wall of the first hot nozzle, one end of the second hot nozzle extends out of an opening of the first hot nozzle, and the second hot nozzle is provided with the heating element for heating materials in the second hot nozzle;
the movable transition joint is arranged at one end, extending into the first hot nozzle, of the second hot nozzle and is used for stretching to change the length so as to drive the second hot nozzle to move along the side line direction of the inner wall of the first hot nozzle; and
and the sealing element is sleeved on the movable transition joint and used for sealing between the inner wall of the first hot nozzle and the movable transition joint so as to ensure the sealing property of the movable transition joint in the telescopic process.
In another embodiment of the present invention, an injection mold is further provided, which includes the above-mentioned retractable hot runner structure, the retractable hot runner structure is mounted on the injection mold, the injection mold is configured to be mounted on an injection molding machine, and a sprue of the injection molding machine is communicated with the retractable hot runner structure.
In another embodiment of the present invention, a working method of an injection mold is further provided, where the working method of the injection mold adopts the above injection mold, and the specific working method includes the following steps: the telescopic hot runner structure is arranged on the injection mold, the injection mold is arranged on an injection molding machine, a sprue bushing of the injection molding machine is communicated with the telescopic hot runner structure, and then the hot-melted plastic is ejected from the sprue bushing of the injection molding machine and sent into a second hot bushing, and then is conveyed to the injection mold for injection molding.
Compared with the prior art, the invention has the beneficial effects that:
the telescopic hot runner structure provided by the embodiment of the invention comprises a hot nozzle and a first hot nozzle, wherein the first hot nozzle is internally provided with a second hot nozzle which can move along the side line direction of the inner wall of the first hot nozzle; the invention controls the temperature of the flow channel in the second hot nozzle and the temperature of the molten material entering the flow channel by heating the heating element, can keep the material in a constant temperature molten state, and further conveys the material to the mold through the movable transition joint, the first hot nozzle and the connecting hot nozzle in sequence for injection molding.
Drawings
Fig. 1 is a schematic structural diagram of a retractable hot runner structure according to an embodiment of the present invention.
Fig. 2 is a perspective view of a retractable hot runner structure according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a stack mold in an open state according to another embodiment of the present invention.
Fig. 4 is a schematic view illustrating a connection relationship between the middle mold plate and the upper mold plate in an open state of the stack mold according to another embodiment of the present invention.
Fig. 5 is a schematic structural view of a stack mold according to another embodiment of the present invention in a mold clamping state.
Fig. 6 is a schematic structural view of a three-plate water-thin die in an open state according to another embodiment of the present invention.
Fig. 7 is a schematic structural view of a three-plate water-attenuating die in a clamped state according to another embodiment of the present invention.
In the figure: 1-connecting a hot nozzle; 2-a first hot nozzle; 3-a seal; 4-a movable transition joint; 5-a heating element; 6-a second hot nozzle; 7-a positioning member; 8-hot runner plate; 9-a mold cavity; 10-intermediate template; 11-a third hot nozzle; 12-upper template; 13-a lower template; 14-a + plate; 15-A plate; 16-B plate; 17-C plate; 18-mold injection into the mold cavity.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention. In order to make the technical solution of the present invention clearer, process steps and device structures well known in the art are omitted here.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
As shown in fig. 1-2, a block diagram of a telescopic hot runner structure provided for one embodiment of the present invention, the telescopic hot runner structure including a connecting hot nozzle 1 for communicating with a mold, further includes:
the device comprises a first hot nozzle 2, wherein a second hot nozzle 6 capable of moving along the side line direction of the inner wall of the first hot nozzle 2 is arranged in the first hot nozzle 2, one end of the second hot nozzle 6 extends out of an opening of the first hot nozzle 2, and a heating element 5 for heating materials in the second hot nozzle 6 is arranged on the second hot nozzle 6;
the movable transition joint 4 is arranged at one end, extending into the first hot nozzle 2, of the second hot nozzle 6 and is used for stretching to change the length so as to drive the second hot nozzle 6 to move along the side line direction of the inner wall of the first hot nozzle 2; and
and the sealing element 3 is sleeved on the movable transition joint 4 and used for sealing between the inner wall of the first hot nozzle 2 and the movable transition joint 4 so as to ensure the sealing property of the movable transition joint 4 in the telescopic process.
In the embodiment of the invention, during operation, molten plastic and other materials enter the second hot nozzle 6, meanwhile, the second hot nozzle 6 is provided with the heating element 5, the materials can be heated through the heating element 5 to control the temperature of a flow passage in the second hot nozzle 6 and the materials in the flow passage, the materials can be kept in a constant temperature molten state, and then are conveyed to a mold for injection molding through the movable transition joint 4, the first hot nozzle 2 and the connecting hot nozzle 1 in sequence, because the movable transition joint 4 is arranged, the length can be changed through stretching according to needs, so that the moving distance requirements of different molds (in opening and closing changes) can be met, meanwhile, the sealing element 3 is sleeved on the movable transition joint 4, the movable transition joint can stretch along with the opening and closing changes of the molds and can keep good sealing effect, namely, the glue leakage situation is avoided while the moving distance requirements of different molds are met, the problem of the hot runner structure that the mould adopted in the current injection molding process has often the condition of leaking glue is solved.
In an example of the present invention, the heating element 5 may be implemented by using a conventional technology, for example, a heating coil and a temperature sensor are disposed on the second hot nozzle 6, and the temperature of the flow channel inside the second hot nozzle 6 and the temperature of the material inside the flow channel may be controlled by a central controller (a conventional known device for controlling, which is not described herein).
In another embodiment of the present invention, the movable transition joint 4 has a telescopic structure for telescoping to change the length, and can be changed to different lengths according to the required stroke of the mold and facilitate frequent replacement and maintenance during use.
Further, as a preferred embodiment of the present invention, the output end of the connecting hot nozzle 1 is provided with a flow regulating part, specifically, the flow regulating part may adopt a needle valve, and the needle valve is located in an injection molding cavity of a corresponding mold to control filling of plastic in injection molding.
In an embodiment of the present invention, the flow rate adjusting element may be other existing structures for adjusting the flow rate, such as a pneumatic valve, an electromagnetic hydraulic valve, an electro-hydraulic valve, a pneumatic-hydraulic valve, a gear valve, etc., and the embodiment of the present invention is described by taking a needle valve as an example, but is not limited thereto, and may be adaptively adjusted according to the installation environment.
Further, as a preferred embodiment of the present invention, the sealing members 3 are a plurality of sealing members, and are of a piston-type structure, and are uniformly sleeved outside the movable transition joint 4.
In the embodiment of the present invention, a set of telescopic hot runner system is formed by the movable transition joint 4 and the sealing member 3, the second hot nozzle 6 and the first hot nozzle 2, and the distance requirement for the movement of different molds can be changed by adjusting the movable transition joint 4 and the first hot nozzle 2.
In an embodiment of the present invention, it should be noted that the number of the sealing members 3 can be selected according to needs, and is not limited herein, preferably, the number of the sealing members 3 is two, a set of retractable hot runner system is formed by the movable transition joint 4 and the sealing member 3, the second hot nozzle 6 and the first hot nozzle 2, and the distance requirement for moving different molds can be changed by adjusting the movable transition joint 4 and the first hot nozzle 2, the connecting hot nozzle 1 is fixed on the movable mold part of the mold, and plastic is injected into the cavity (the mold cavity 9 or the mold injection cavity 18) through the branch channel.
Further, as a preferred embodiment of the present invention, a plurality of positioning members 7 for installing the telescopic hot runner structure are further disposed outside the connecting hot nozzle 1 and/or the second hot nozzle 6, and the installation of the telescopic hot runner structure can be achieved through the positioning members 7.
In an embodiment of the present invention, specifically, the retractable hot runner structure is first installed on a mold, then the mold is installed on an injection molding machine, a sprue of the injection molding machine is aligned to a positioning member 7 (specifically, a hot runner positioning sleeve hole structure) in the mold, during operation, hot-melted plastic is ejected from the sprue of the injection molding machine and enters a second hot nozzle 6, and meanwhile, a material is kept in a constant temperature melting state by a heating member 5, and then is conveyed to the mold through a movable transition joint 4, a first hot nozzle 2 and a connecting hot nozzle 1 in sequence for injection molding.
Further, as a preferred embodiment of the present invention, the sealing member 3 comprises the following raw materials in parts by weight: 70-81 parts of PEEK (Poly-ether-ether-ketone), 3-5 parts of graphite with the particle size smaller than 300 meshes, 3-5 parts of spherical alumina (with the particle size of 50-100 nm), 3-5 parts of nano calcium carbonate (with the particle size of 50-100 nm) and 10-15 parts of PTFE (polytetrafluoroethylene) micro powder (with the particle size of 10-50 mu m).
In the embodiment of the invention, the sealing element 3 prepared by adopting the raw materials can achieve good sealing effect when being used for the telescopic hot runner structure, and the special material is suitable for being used in a mold for producing plastic materials with the melting point lower than 260 ℃.
In one embodiment of the present invention, preferably, the sealing member 3 comprises the following raw materials in parts by weight: 70 parts of PEEK, 3 parts of graphite with the particle size of 299 meshes, 3 parts of spherical alumina (the particle size of 50 nm), 3 parts of nano calcium carbonate (the particle size of 50 nm) and 10 parts of PTFE micro powder (the particle size of 10 mu m).
In another embodiment of the present invention, preferably, the sealing member 3 comprises the following raw materials in parts by weight: 81 parts of PEEK, 5 parts of graphite with the particle size of 200 meshes, 5 parts of spherical alumina (the particle size of 100 nm), 5 parts of nano calcium carbonate (the particle size of 100 nm) and 15 parts of PTFE micro powder (the particle size of 50 mu m).
In another embodiment of the present invention, preferably, the sealing member 3 comprises the following raw materials in parts by weight: 75 parts of PEEK, 4 parts of graphite with the particle size of less than 300 meshes, 4 parts of spherical alumina (the particle size of 75 nm), 4 parts of nano calcium carbonate (the particle size of 75 nm) and 12 parts of PTFE micro powder (the particle size of 30 mu m).
Further, as a preferred embodiment of the present invention, the method for preparing the sealing member 3 includes the steps of:
1) respectively drying spherical aluminum oxide, nano calcium carbonate, PTFE and PEEK, and drying in a vacuum oven at 150 ℃ for 2-5 h;
2) adding the obtained dried PTFE, PEEK, spherical alumina and nano calcium carbonate into a high-speed mixer, and mixing at a high speed of 80-100 ℃ for 10-30 minutes;
3) adding the mixed material into a double-screw extruder for extrusion granulation, wherein the extrusion temperature range is 400 ℃ and 420 ℃, and the rotating speed is 250 ℃ and 300 r/min;
4) the pelletized composite material is injection molded into the desired shape of the seal 3 by an injection molding machine.
In the embodiment of the present invention, the sealing member 3 may be used in a mold for producing a plastic material having a melting point of less than 260 ℃.
In one embodiment of the present invention, preferably, the sealing member 3 is prepared by: 1) respectively drying spherical aluminum oxide, nano calcium carbonate, PTFE and PEEK, and drying in a vacuum oven at 150 ℃ for 2 hours; 2) adding the obtained dried PTFE, PEEK, spherical alumina and nano calcium carbonate into a high-speed mixer, and mixing at 80 ℃ for 30 minutes at a high speed; 3) adding the mixed materials into a double-screw extruder for extrusion granulation, wherein the extrusion temperature interval is 400 ℃, and the rotating speed is 300 r/min; 4) the pelletized composite material is injection molded into the desired shape of the seal 3 by an injection molding machine.
In yet another embodiment of the present invention, preferably, the sealing member 3 is prepared by a method comprising: 1) respectively drying spherical aluminum oxide, nano calcium carbonate, PTFE and PEEK, and drying in a vacuum oven at 150 ℃ for 5 hours; 2) adding the obtained dried PTFE, PEEK, spherical alumina and nano calcium carbonate into a high-speed mixer, and mixing at 100 ℃ for 10 minutes at a high speed; 3) adding the mixed materials into a double-screw extruder for extrusion granulation, wherein the extrusion temperature interval is 420 ℃, and the rotating speed is 250 r/min; 4) the pelletized composite material is injection molded into the desired shape of the seal 3 by an injection molding machine.
As shown in fig. 2 to 7, an embodiment of the present invention further provides an injection mold, which includes the above-mentioned retractable hot runner structure, wherein the retractable hot runner structure is installed on the injection mold (specifically, the retractable hot runner structure is installed by a plurality of positioning elements 7 disposed outside the connecting hot nozzle 1 and/or the second hot nozzle 6), the injection mold is configured to be installed on an injection molding machine, a sprue of the injection molding machine is communicated with the retractable hot runner structure, and the injection mold includes any one of a stack mold or a three-plate water line mold.
Further, as a preferred embodiment of the present invention, referring to fig. 3 to 5, when the injection mold is a laminated mold, the laminated mold includes an upper mold plate 12, a middle mold plate 10 and a lower mold plate 13, which are sequentially disposed, a hot runner plate 8 for installing and fixing the first hot nozzle 2 is disposed in the middle mold plate 10, specifically, the middle mold plate 10 includes two separable mold plate main bodies, the hot runner plate 8 is formed between the two mold plate main bodies, the first hot nozzle 2 is communicated with the hot runner plate 8, the hot runner plate 8 is communicated with a corresponding mold cavity 9 through a plurality of third hot nozzles 11, and the mold cavity 9 is used for injection molding of materials input thereto.
Further, as another preferred embodiment of the present invention, referring to fig. 6-7, when the injection mold is a three-plate water-ring mold, the three-plate water-ring mold comprises an a + plate 14, an a plate 15, a B plate 16 and a C plate 17, which are sequentially arranged, the a plate 15 is provided with a mold injection cavity 18 for communicating with the connecting hot nozzle 1, and the mold injection cavity 18 is used for injection molding of the material input thereto.
As another preferred embodiment of the present invention, the flow regulating member connected to the output end of the hot nozzle 1 is a needle valve, and the needle valve is located in the injection cavity (mold cavity 9 or mold injection cavity 18) of the corresponding mold to control the filling of the plastic in the injection cavity (mold cavity 9 or mold injection cavity 18).
Further, an embodiment of the present invention further provides a working method of an injection mold, where the working method of the injection mold adopts the injection mold, and the specific working method includes the following steps: the telescopic hot runner structure is arranged on the injection mold, the injection mold is arranged on an injection molding machine, a sprue bushing of the injection molding machine is communicated with the telescopic hot runner structure, and then the hot-melted plastic is ejected from the sprue bushing of the injection molding machine and sent into a second hot bushing 6 and then is conveyed to the injection mold for injection molding.
As another preferred embodiment of the present invention, please refer to fig. 3-5, wherein when the injection mold is a stack mold, fig. 3 is a schematic structural view of the stack mold in an open state according to the embodiment of the present invention; fig. 5 is a schematic structural view of a stack mold provided in an embodiment of the present invention in a mold clamping state. When the injection mold is a laminated mold, the working method of the injection mold comprises the following steps: firstly, a laminated mold is installed on an injection molding machine, a sprue bushing of the injection molding machine is aligned to a positioning piece 7 of the laminated mold, when the injection molding machine works, hot-melt plastic is ejected from the sprue bushing of the injection molding machine and enters a second hot nozzle 6, a first hot nozzle 2 and a hot runner plate 8, heating pipes are embedded in the second hot nozzle 6, the first hot nozzle 2 and the hot runner plate 8, the heating pipes have a constant temperature heating control function and can keep the plastic in a constant temperature melting state, a third hot nozzle 11, the hot runner plate 8 and a mold cavity 9 are fixed into a whole, the front part of the second hot nozzle 6 is connected with a movable transition joint 4, two sealing pieces 3 are sleeved on the movable transition joint 4, the sealing pieces 3 are piston-type high-temperature-resistant and abrasion-resistant high-strength sealing rings, the second hot nozzle 6 is sleeved with the first hot nozzle 2, a telescopic hot runner system is formed by the sealing pieces 3 and the first hot nozzle 2 in the middle, and a movable mold part connecting the hot nozzle 1 is fixed into, the first hot nozzle 2 and the hot runner plate 8 are fastened into a whole, and the branch connecting the hot nozzle 1 is provided with a needle valve at the part of each mold cavity 9 to control the filling of the plastic in the mold cavity 9.
As another preferred embodiment of the present invention, please refer to fig. 6-7, wherein when the injection mold is a three-plate slim water nozzle mold, fig. 6 is a schematic structural view of the three-plate slim water nozzle mold in an open mold state according to the embodiment of the present invention; fig. 7 is a schematic structural diagram of a three-plate water-attenuating die provided in an embodiment of the present invention in a die-clamping state. When the injection mold is a three-plate thin water port mold, the working method of the injection mold comprises the following steps: firstly, a three-plate water-jet mould is arranged on an injection molding machine, a sprue bushing of the injection molding machine is aligned to a positioning piece 7 of the three-plate water-jet mould, when the injection molding machine works, hot-melt plastic is ejected from the sprue bushing of the injection molding machine and enters a second hot nozzle 6 and a first hot nozzle 2, heating pipes are embedded in the second hot nozzle 6 and the first hot nozzle 2, the hot-melt plastic has a constant-temperature heating control function and can keep a plastic in a constant-temperature melting state, a connecting hot nozzle 1 and a mould injection cavity 18 are fixedly integrated into a whole, the front part of the second hot nozzle 6 is connected with a movable transition joint 4, the movable transition joint 4 is sleeved with two sealing pieces 3, the sealing pieces 3 are particularly piston-type high-temperature-resistant and abrasion-resistant high-strength sealing rings, the second hot nozzle 6 and the first hot nozzle 2 are sleeved together, a telescopic hot runner system is formed by the sealing pieces 3 and the first hot nozzle 2 in the middle, the first hot nozzle 2 is fixed with the A plate 15 into a whole, and the branch connected with the hot nozzle 1 is provided with a needle valve at the part of each mould injection cavity 18 to control the filling of the plastic in the mould injection cavity 18.
The embodiment of the invention provides a telescopic hot runner structure, which comprises a hot nozzle 1 and a first hot nozzle 2, wherein the first hot nozzle 2 is internally provided with a second hot nozzle 6 which can move along the side line direction of the inner wall of the first hot nozzle 2, one end of the second hot nozzle 6 extends out of an opening of the first hot nozzle 2, and the second hot nozzle 6 is provided with a heating element 5 for heating materials in the second hot nozzle 6; one end of the second hot nozzle 6 extending into the first hot nozzle 2 is provided with a movable transition joint 4 for stretching to change the length so as to drive the second hot nozzle 6 to move along the side line direction of the inner wall of the first hot nozzle 2; the movable transition joint 4 is sleeved with a sealing element 3 for sealing between the inner wall of the first hot nozzle 2 and the movable transition joint 4 so as to ensure the sealing performance of the movable transition joint 4 in the telescopic process, an injection mold is provided based on the telescopic hot runner structure, when in work, molten plastic and other materials enter the second hot nozzle 6, meanwhile, the second hot nozzle 6 is provided with a heating element 5 which can be heated through the heating element 5 so as to control the temperature of a flow passage in the second hot nozzle 6 and the temperature of the materials in the flow passage, so that the materials can be kept in a constant temperature molten state and then are conveyed to the mold for injection molding through the movable transition joint 4, the first hot nozzle 2 and the connecting hot nozzle 1 in sequence, and due to the arrangement of the movable transition joint 4, the movable transition joint can be stretched according to the requirement to change the length, so that the requirement of the moving distance of different molds (in the opening and closing change) can be met, simultaneously, the cover is equipped with on the activity transition joint 4 sealing member 3, can follow the mould and open and shut and change and stretch out and draw back and keep good sealed effect, avoids appearing leaking the gluey condition promptly when satisfying the displacement demand of different moulds, has solved the problem that the gluey condition often can appear leaking in the hot runner structure that the mould adopted among the current injection molding process.
The electric appliances presented in the article can be connected with an external main controller and 220V mains supply, and the main controller can be a conventional known device controlled by a computer and the like.
The telescopic hot runner structure provided by the invention can be used in the field of injection molds, in particular to a mold which has no runner material, no glue leakage in a runner during injection molding and stable performance. When the problem of secondary material of the water gap generated in the injection molding process is solved, a runner electric heating auxiliary method is adopted, so that the temperature in the runner reaches the melting point of plastic in the injection molding process, the secondary material of the water gap is not generated, the auxiliary hot runner structure is a telescopic closed structure, the leakage of plastic melt is not generated in the opening and closing process of each component of an injection mold, further, the plastic agglomeration is not caused, and the mold is crushed by the plastic block in the opening and closing process of the mold.
It should be further noted that, in order to obtain a telescopic hot runner structure, the invention provides a special high-temperature-resistant, high-pressure-resistant, wear-resistant and aging-resistant composite sealing device (i.e., the sealing element 3) and materials, so as to ensure good sealing performance of high-temperature colloid in the telescopic process of the runner and avoid various problems such as glue leakage. By the aid of the method, a group of hot runner structures with good sealing effect and telescopic distance along with opening and closing changes of the die can be obtained, the hot runner structures can be widely applied to efficient injection dies such as a laminated die and a three-plate water line port die, secondary water gap materials cannot be generated in the injection process, injection materials are saved, the treatment process of the secondary water gap materials is reduced, and production efficiency is improved; the telescopic hot runner structure is used for a multi-layer die structure and a three-plate water-thin mouth die structure in a multi-way mode, stable production and quality are guaranteed, meanwhile, once injection molding can improve the efficiency by times, and the production cost is greatly reduced.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A telescopic hot runner structure including a connecting hot nozzle for communicating with a mold, the telescopic hot runner structure further comprising:
the device comprises a first hot nozzle, a second hot nozzle and a heating element, wherein the first hot nozzle is internally provided with the second hot nozzle which can move along the side line direction of the inner wall of the first hot nozzle, one end of the second hot nozzle extends out of an opening of the first hot nozzle, and the second hot nozzle is provided with the heating element for heating materials in the second hot nozzle;
the movable transition joint is arranged at one end, extending into the first hot nozzle, of the second hot nozzle and is used for stretching to change the length so as to drive the second hot nozzle to move along the side line direction of the inner wall of the first hot nozzle; and
and the sealing element is sleeved on the movable transition joint and used for sealing between the inner wall of the first hot nozzle and the movable transition joint so as to ensure the sealing property of the movable transition joint in the telescopic process.
2. The telescopic hot-runner structure of claim 1, wherein the output end of the connecting hot nozzle is provided with a flow regulating member.
3. The telescopic hot runner structure of claim 1, wherein the plurality of seals are piston-type structures that are uniformly disposed around the outside of the movable transition joint.
4. The telescopic hot-runner structure of claim 1, wherein a plurality of positioning members are further provided outside the connecting hot nozzle and/or the second hot nozzle for mounting the telescopic hot-runner structure.
5. The telescopic hot runner structure of claim 1, wherein the seal comprises the following raw materials in parts by weight: 70-81 parts of PEEK, 3-5 parts of graphite, 3-5 parts of spherical alumina, 3-5 parts of nano calcium carbonate and 10-15 parts of PTFE micro powder.
6. The telescopic hot-runner structure of claim 5, wherein the seal is prepared by: 1) respectively drying spherical aluminum oxide, nano calcium carbonate, PTFE and PEEK; 2) adding dried PTFE, PEEK, spherical alumina and nano calcium carbonate into the mixture, uniformly mixing the mixture at 80-100 ℃, then carrying out extrusion granulation and injection molding to obtain the sealing element; wherein the extrusion temperature range is 400 ℃ and 420 ℃, and the rotation speed is 250 ℃ and 300 r/min.
7. An injection mold comprising the telescopic hot runner structure of any one of claims 1-6, wherein the telescopic hot runner structure is mounted on the injection mold, the injection mold being adapted to be mounted on an injection molding machine, a sprue of the injection molding machine being in communication with the telescopic hot runner structure.
8. An injection mold according to claim 7, wherein the injection mold comprises any one of a stack mold or a three-plate water-thin die.
9. The injection mold according to claim 8, wherein when the injection mold is a laminated mold, the laminated mold comprises an upper mold plate, a middle mold plate and a lower mold plate which are sequentially arranged, a hot runner plate for installing and fixing the first hot nozzle is arranged in the middle mold plate, the first hot nozzle is communicated with the hot runner plate, the hot runner plate is communicated with corresponding mold cavities through a plurality of third hot nozzles, and the mold cavities are used for injection molding of materials input into the mold cavities; when the injection mold is a three-plate water-jet mold, the three-plate water-jet mold comprises an A + plate, an A plate, a B plate and a C plate which are sequentially arranged, wherein a mold injection cavity communicated with a connecting hot nozzle is arranged on the A plate, and the mold injection cavity is used for performing injection molding on materials input into the mold injection cavity.
10. An operating method of an injection mould, characterized in that an injection mould according to any of claims 7-9 is used, the specific operating method comprising the following steps: the telescopic hot runner structure is arranged on the injection mold, the injection mold is arranged on an injection molding machine, a sprue bushing of the injection molding machine is communicated with the telescopic hot runner structure, and then the hot-melted plastic is ejected from the sprue bushing of the injection molding machine and sent into a second hot bushing, and then is conveyed to the injection mold for injection molding.
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| CN202010842094.2A CN111890641A (en) | 2020-08-20 | 2020-08-20 | Telescopic hot runner structure, injection mold and working method of injection mold |
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| CN202010842094.2A CN111890641A (en) | 2020-08-20 | 2020-08-20 | Telescopic hot runner structure, injection mold and working method of injection mold |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113733485A (en) * | 2020-12-01 | 2021-12-03 | 上海瀚典热流道科技有限公司 | High-stability hot runner injection molding mechanism |
| CN114986807A (en) * | 2022-06-02 | 2022-09-02 | 美的集团股份有限公司 | Injection mould |
-
2020
- 2020-08-20 CN CN202010842094.2A patent/CN111890641A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113733485A (en) * | 2020-12-01 | 2021-12-03 | 上海瀚典热流道科技有限公司 | High-stability hot runner injection molding mechanism |
| CN114986807A (en) * | 2022-06-02 | 2022-09-02 | 美的集团股份有限公司 | Injection mould |
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