CN220482519U - Horn-mouth type extrusion die for cable - Google Patents
Horn-mouth type extrusion die for cable Download PDFInfo
- Publication number
- CN220482519U CN220482519U CN202322046607.0U CN202322046607U CN220482519U CN 220482519 U CN220482519 U CN 220482519U CN 202322046607 U CN202322046607 U CN 202322046607U CN 220482519 U CN220482519 U CN 220482519U
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- die
- mouth type
- cavity
- extrusion
- die sleeve
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- 238000001125 extrusion Methods 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000004809 Teflon Substances 0.000 claims abstract description 25
- 229920006362 Teflon® Polymers 0.000 claims abstract description 25
- 238000004513 sizing Methods 0.000 claims abstract description 11
- 210000004907 gland Anatomy 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000003063 flame retardant Substances 0.000 abstract description 19
- 239000000779 smoke Substances 0.000 abstract description 19
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 18
- 239000003292 glue Substances 0.000 abstract description 16
- 238000005253 cladding Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 229920000098 polyolefin Polymers 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012796 inorganic flame retardant Substances 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 206010000496 acne Diseases 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses a bell-mouth type extrusion die for cables, which comprises a die sleeve and a die core, wherein the die sleeve is internally provided with a middle through cavity, and the die core is internally provided with a wire outlet hole; the mold core is embedded into the middle through cavity of the mold sleeve, and the mold core and the middle through cavity are not contacted; a conical sizing material runner is formed between the middle through cavity and the cone on the outer surface of the mold core; the tail end of the straight tubular line bearing area of the line outlet hole is a horn mouth type pipe orifice to form a horn mouth type line bearing area; a Teflon lining is arranged between the outer side of the bell-mouth type line bearing area and the inner side of the die sleeve, and is communicated with the conical sizing material runner. The die solves the problems of difficult extrusion processing and low extrusion speed of the low-smoke halogen-free flame-retardant cable material, eliminates the phenomenon that extrusion of the sheath is not smooth due to annular ripple, unstable glue discharge and adhesive glue stock, greatly improves the extrusion appearance, improves the cladding compactness of the sheath, reduces the internal air gap, and finally improves the overall low-smoke halogen-free flame-retardant fireproof performance of the cable.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to a bell mouth type extrusion die for a cable.
Background
As is well known, in recent years, with the rapid development of national economy and urban construction, public facilities such as high-rise buildings, hotels, malls, stadiums, hospitals, schools, subways, stations, airports and the like are increasing, and the importance of electric fire protection and fire prevention is more important in the public places where people are dense. Aging, short circuit and overload of electric circuits are important reasons for causing electric fires, the electric circuit fires account for more than 60% of the electric fires, and when the fires occur, combustible materials in the electric circuits can possibly cause further spread of the fires, and certain organic halogen materials can also generate a large amount of toxic and harmful gases when being burnt, so that larger casualties and property loss can be caused, and the fire fighting situation is very serious. Therefore, the safety performance of the electric wires and cables is also of great concern in operation, especially in public places where people are dense and cables are densely laid, fire disasters are extremely easy to happen, serious personnel safety accidents are caused, and the places all put higher demands on the halogen-free, low-smoke and flame-retardant performance of the cables. In order to reduce fire hazard, improve personal safety and reduce property loss, conventional flame-retardant wire and cable cannot meet safety requirements in public places with dense personnel, and a low-smoke halogen-free flame-retardant cable with higher flame retardant grade is required to achieve better flame-retardant and fireproof effects.
The low-smoke halogen-free flame-retardant cable has the structures of an inner sheath, an outer sheath and the like which have key decision functions and adopt low-smoke halogen-free flame-retardant polyolefin materials. Because the material contains a large amount of inorganic flame-retardant materials such as aluminum hydroxide, magnesium hydroxide and the like, when the extruder extrudes the material in a molten state, the rubber material has poor fluidity and large extrusion melting pressure, and the extrusion of the extrusion pipe type die designed by the prior art has the following problems:
(1) The line bearing area of the mold core is of a straight tubular structure, and has the problems of annular extrusion ripple, unstable glue discharge, unsmooth coating, large air gap, very low extrusion speed, low production efficiency, difficult processing and the like, and has great influence on the low-smoke halogen-free flame retardant performance index of the cable.
(2) The rubber outlet runner of the die sleeve and the die sleeve are wholly made of steel, and the steel is quick in heat conduction and easy to adhere, so that the smoothness of the rubber outlet runner of the die is reduced, a circle of rubber material attachments can be formed on the edge of the rubber outlet, and the problems of multiple longitudinal stripes, local pimple agglomeration, unsmooth appearance and the like on the outer surface of the extruded low-smoke halogen-free cable sheath are caused, so that the influence on the appearance quality of the cable is large.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the bell mouth type extrusion die for the cable, which solves the problems of difficult extrusion processing and low extrusion speed of the low-smoke halogen-free flame-retardant cable material and eliminates the phenomenon of unsmooth extrusion stripes of the sheath caused by unstable extrusion annular corrugation and adhesive glue material of a die orifice.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the horn mouth type extrusion die for the cable comprises a die sleeve and a die core, wherein a middle through cavity is formed in the die sleeve, and a wire outlet hole is formed in the die core; the mold core is embedded into the middle through cavity of the mold sleeve, and the mold core and the middle through cavity are not contacted; a conical sizing material runner is formed between the middle through cavity and the cone on the outer surface of the mold core; the tail end of the straight tubular line bearing area of the line outlet hole is a horn mouth type pipe orifice, and an included angle formed by the horn mouth type pipe orifice and the central axis of the mold core is 20 degrees, so that a horn mouth type line bearing area is formed; and a Teflon lining is arranged between the outer side of the bell-mouth type line bearing area and the inner side of the die sleeve, and is communicated with the conical sizing material runner.
Preferably, the Teflon bushing is embedded on the inner side of the die sleeve.
Preferably, the Teflon bushing is fixed on the die sleeve through a round gland.
Preferably, the outside of the round gland is in a threaded shape, the inner side of the discharge hole of the die sleeve is in a threaded shape, the round gland is fastened with the inner side of the discharge hole of the die sleeve through threads on the outer side in a threaded locking manner, and the inner diameter of the round gland is the same as the outer diameter of the protruding part at the front end of the Teflon lining.
Preferably, the die sleeve and the die core are made of die steel.
Preferably, the input end to the output end of the middle through cavity is narrowed from wide.
Preferably, the inner side of the Teflon bushing has an axial straight length of 3-5mm.
Compared with the prior art, the utility model has the beneficial effects that:
the bell mouth type extrusion die for the cable can effectively release the extrusion glue melting pressure of the low-smoke halogen-free flame-retardant polyolefin cable material, improve the glue melting fluidity, solve the problems of difficult extrusion processing and low extrusion speed of the low-smoke halogen-free flame-retardant cable material, eliminate the phenomena of unsmooth extrusion stripes of the sheath caused by extrusion annular corrugation, unstable glue discharging and die orifice adhesion glue material, greatly improve the extrusion appearance of the cable sheath, improve the cladding compactness of the sheath, reduce the internal air gap and finally improve the overall low-smoke halogen-free flame-retardant fireproof performance of the cable; in the extrusion processing application of the low-smoke halogen-free cable, the extrusion effect is good, and the product performance meets the requirements.
Drawings
FIG. 1 is a cross-sectional view showing the structure of a mold according to embodiment 1 of the present utility model;
fig. 2 is a structural sectional view of the teflon liner of example 1 of the present utility model;
FIG. 3 is an exploded view of the mold in example 1 of the present utility model;
FIG. 4 is a cross-sectional view showing the structure of the die sleeve and the die core in example 1 of the present utility model;
FIG. 5 is a cross-sectional view showing the structure of a mold in example 2 of the present utility model;
fig. 6 is a structural sectional view of the teflon liner of example 2 of the present utility model;
FIG. 7 is an exploded view of the mold in example 2 of the present utility model;
fig. 8 is a cross-sectional view showing the structure of the die sleeve and the die core in embodiment 2 of the present utility model.
Description of the embodiments
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Examples
As shown in fig. 1-4, a bell-mouth type extrusion die for cables comprises a die sleeve 1 and a die core 2, wherein a middle through cavity is formed in the die sleeve 1, and a wire outlet hole is formed in the die core 2; the mold core 2 is embedded into the middle through cavity of the mold sleeve 2, and the middle through cavity and the mold core are not contacted, so that a smooth conical sizing material runner 3 is formed between the middle through cavity and the cone on the outer surface of the mold core 2; the tail end of the straight tubular line bearing area of the line outlet hole is a horn mouth type pipe orifice, an included angle formed by the horn mouth type pipe orifice and the central axis of the mold core 2 is 20 degrees, and a horn mouth type line bearing area 4 is formed; a Teflon lining 5 is arranged between the outer side of the bell mouth type line bearing area and the inner side of the die sleeve 1, the Teflon lining 5 is embedded on the inner side of the die sleeve 1, and the Teflon runner 5 is communicated with the conical sizing material runner 3.
Examples
As shown in fig. 5-shown in the drawings, a bell-mouth type extrusion die for cables comprises a die sleeve 1 and a die core 2, wherein a middle through cavity is formed in the die sleeve 1, and a wire outlet hole is formed in the die core 2; the mold core 2 is embedded into the middle through cavity of the mold sleeve 2, and the middle through cavity and the mold core are not contacted, so that a smooth conical sizing material runner 3 is formed between the middle through cavity and the cone on the outer surface of the mold core 2; the tail end of the straight tubular line bearing area of the line outlet hole is a horn mouth type pipe orifice, and an included angle formed by the horn mouth type pipe orifice and the central axis of the mold core 2 is 20 degrees, so that a horn mouth type line bearing area 4 is formed; a Teflon lining 5 is arranged between the outer side of the bell-mouth line bearing area and the inner side of the die sleeve 1, and the Teflon lining 5 is communicated with the conical sizing material runner 3.
The difference from example 1 is that: the Teflon bushing 5 is fixed on the die sleeve 2 through the round gland 6, the outer side of the round gland 6 is in a threaded shape, the inner side of a discharge hole of the die sleeve is in a threaded shape, the round gland 6 is fastened with the inner side of the discharge hole of the die sleeve through threads on the outer side in a threaded locking manner, the inner diameter of the round gland is the same as the outer diameter of a protruding part at the front end of the Teflon bushing, and the Teflon bushing is fixed, so that the Teflon bushing 5 is more stably fixed in the die sleeve, and the die sleeve is convenient to replace in the later period;
in embodiments 1 and 2, the input end to the output end of the middle through cavity is narrowed from wide to narrow, so that the feeding speed is higher than the discharging speed, and the material extrusion is realized without using other extrusion tools; the die sleeve 1 and the die core 2 are made of die steel, have high hardness, strength and wear resistance, and have enough toughness, so that the service lives of the die sleeve 1 and the die core 2 are prolonged;
because the low-smoke halogen-free flame-retardant polyolefin sheath material contains a large amount of inorganic flame-retardant materials such as aluminum hydroxide, magnesium hydroxide and the like, when the extruder extrudes the material in a molten state, the rubber material has poor flowability and large extrusion melting pressure, so that the extrusion is difficult, the extrusion speed is low, and simultaneously, the axial straight length of a conical rubber material runner and the axial straight length of the inner side of a Teflon lining are shortened to be 3-5mm, so that the extrusion melting pressure can be effectively released and reduced, the melting flowability is improved, the extruded appearance is more stable and smooth, and the defects such as ripple, bamboo joint and the like are overcome.
In summary, since the sheath of the low-smoke halogen-free flame-retardant cable adopts the extrusion pipe coating process, the die core wire outlet hole of the extrusion die is provided with a tubular wire bearing area, while the wire bearing area of the conventional extrusion pipe die core in the prior art is of a flat tubular structure, and the glue outlet hole runner of the conventional die sleeve in the prior art is made of steel, so that the problems of annular ripple extrusion, unstable glue outlet, unsmooth coating, large air gap, slow extrusion speed, unsmooth processing, unsmooth sheath extrusion stripes caused by glue stock adhesion and the like exist, the tail end of the flat tubular wire bearing area of the wire outlet hole of the die core 2 is designed into a horn mouth type pipe orifice, the included angle formed by the horn mouth type pipe orifice and the central axis of the die core 2 is 20 degrees, so that a horn mouth type wire bearing area is formed, and when the melted glue stock is extruded to the glue outlet hole of the die through the runner, the flowing direction of the glue stock is changed from the flat direction to the outward horn mouth type 20 degrees, thereby effectively releasing the extrusion glue melting pressure of the low-smoke halogen-free flame-retardant polyolefin cable, improving the fluidity and eliminating the phenomena of annular ripple extrusion and unstable glue outlet; and additionally arranging a Teflon lining between the outer side of the bell-mouth line bearing area and the inner side of the die sleeve, the novel rubber material has the characteristics of 260 ℃ high temperature resistance, acid and alkali resistance, extremely low friction coefficient, self-lubricating property and the like, and the molten rubber material has small friction resistance, can not adhere to the die opening when flowing, can not cause the phenomenon of unsmooth extrusion stripes of the die sleeve, and greatly improves the brightness and smoothness of the extrusion appearance. The extrusion appearance of the sheath is improved, the cladding compactness of the sheath is improved, the air gap in the sheath is reduced, the overall low-smoke halogen-free flame-retardant fireproof performance of the cable is finally improved, and the problems that the low-smoke halogen-free flame-retardant cable material is difficult to extrude and process and the extrusion speed is low are solved; in addition, in the extrusion processing application of the low-smoke halogen-free cable, the extrusion effect is good, and the product performance meets the requirements.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a horn mouth formula extrusion tooling for cable, includes die sleeve (1) and mold core (2), its characterized in that: the inside of the die sleeve (1) is a middle through cavity, and the inside of the die core (2) is a wire outlet hole; the mold core (2) is embedded into the middle through cavity of the mold sleeve (1) and is not contacted with the middle through cavity; a conical sizing material runner (3) is formed between the middle through cavity and the cone on the outer surface of the mold core (2); the tail end of the straight tubular line bearing area of the line outlet hole is a horn mouth type pipe orifice, and an included angle formed by the horn mouth type pipe orifice and the central axis of the mold core (2) is 20 degrees, so that a horn mouth type line bearing area (4) is formed; a Teflon lining (5) is arranged between the outer side of the bell-mouth type line bearing area and the inner side of the die sleeve (1), and the Teflon lining (5) is communicated with the conical sizing material runner (3).
2. The bell mouth type extrusion die for a cable according to claim 1, wherein: the Teflon lining (5) is inlaid on the inner side of the die sleeve (1).
3. The bell mouth type extrusion die for a cable according to claim 1, wherein: the Teflon bushing (5) is fixed on the die sleeve (1) through a round gland (6).
4. A bell mouth type extrusion die for a cable according to claim 3, wherein: the outside of the round gland (6) is in a threaded shape, the inner side of the discharge hole of the die sleeve (1) is in a threaded shape, the round gland (6) is fastened with the inner side of the discharge hole of the die sleeve through threads on the outer side in a threaded locking manner, and the inner diameter of the round gland is identical to the outer diameter of the protruding part at the front end of the Teflon bushing (5).
5. The bell mouth type extrusion die for a cable according to claim 2 or 4, wherein: the die sleeve (1) and the die core (2) are made of die steel.
6. The bell mouth type extrusion die for a cable according to claim 1, wherein: the input end to the output end of the middle through cavity is narrowed from wide.
7. The bell mouth type extrusion die for a cable according to claim 1, wherein: the axial straight length of the conical sizing material runner (3) and the axial straight length of the inner side of the Teflon lining (5) are 3-5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322046607.0U CN220482519U (en) | 2023-08-01 | 2023-08-01 | Horn-mouth type extrusion die for cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322046607.0U CN220482519U (en) | 2023-08-01 | 2023-08-01 | Horn-mouth type extrusion die for cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220482519U true CN220482519U (en) | 2024-02-13 |
Family
ID=89824912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322046607.0U Active CN220482519U (en) | 2023-08-01 | 2023-08-01 | Horn-mouth type extrusion die for cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220482519U (en) |
-
2023
- 2023-08-01 CN CN202322046607.0U patent/CN220482519U/en active Active
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