CN207038253U - The mould of the insulating element of cable - Google Patents
The mould of the insulating element of cable Download PDFInfo
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- CN207038253U CN207038253U CN201720972618.3U CN201720972618U CN207038253U CN 207038253 U CN207038253 U CN 207038253U CN 201720972618 U CN201720972618 U CN 201720972618U CN 207038253 U CN207038253 U CN 207038253U
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- insulating element
- mould
- cable
- external mold
- spreader
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Abstract
The utility model provides a kind of mould of the insulating element of cable, the insulating element is provided with vertical hole, the mould includes external mold and internal model, the external mold and internal model cooperatively form stream chamber, spreader is provided between the external mold and internal model, solid parts are fixed with the spreader, for molding the vertical hole of the insulating element.The mould of the insulating element of the utility model cable easily molds the insulating element with vertical hole, and the vertical hole allows air into, and the dielectric constant of air is minimum, so as to reduce the dielectric constant of insulating element, and then reduces the decay of wired signal transmission.
Description
Technical field
It the utility model is related to mould, more particularly to the mould of the insulating element of cable.
Background technology
Cable all has inner wire and an insulating element, and one kind in cable is coaxial cable, and it includes coaxial from inside to outside
Inner wire, insulating element, outer conductor, the sheath of setting.Coaxial cable is good because having antijamming capability, transmits the excellent of data stabilization
Point, it is widely used in transmitting, distributes electric energy or transmission electric signal.
The insulating element of cable is typically to be made up of polytetrafluoroethylene (PTFE), and polytetrafluoroethylene (PTFE) has other engineering plastics not comparable
The excellent properties of plan, its frequency range is wide, and high/low temperature use range is wide, and chemical stability is good, and electric simulation strength is high, resistance to air
Ageing properties are excellent, therefore are commonly used for the insulating element material of cable.
At present, the production and processing of the insulating element of state's inner cable using solid pushing form.Solid pushing it is exhausted
Edge part dielectric constant is larger, and decay is larger, especially after the frequency of use more than 3GHz, decays with the increase of frequency and increases
Greatly.And the cast outer mold structure for producing solid insulation part is simple, only crush zone and sizing area can only be coated on insulating materials
Inner wire periphery, it is impossible to make insulating element produce vertical hole.
Utility model content
In view of the foregoing, it is necessary to a kind of mould of the insulating element of cable is provided, produces insulating element more
Individual vertical hole, the dielectric constant of insulating element is reduced, and then reduce the decay of wired signal transmission.
In order to achieve the above object, the technical solution adopted in the utility model is：
A kind of mould of the insulating element of cable, the insulating element are provided with vertical hole, and the mould includes outer
Mould and internal model, the external mold and internal model cooperatively form stream chamber, and spreader, the shunting are provided between the external mold and internal model
Solid parts are fixed with cone, for molding the vertical hole of the insulating element.
Preferably, the inner space of the external mold is provided with crush zone and sizing area.
Preferably, the external mold is additionally provided with stream entrance and stream outlet；The stream entrance is located at the crush zone, institute
State stream outlet and be located at the sizing area.
Preferably, the spreader is located at the stream porch.
Preferably, the solid parts stretch out inside the spreader, and extend in the sizing area.
Preferably, the internal model is inserted in the external mold by the stream entrance.
Preferably, the insulating element is hollow structure and wall is provided with the vertical hole, is provided with inside the internal model outside
The hollow needle tubing stretched out, for molding the hollow structure of the insulating element.
Preferably, the solid parts are solid needle tubing.
Compared with prior art, the utility model provides a kind of mould of the insulating element of cable, external mold with
Spreader is provided between internal model, and solid parts are fixed in spreader, so as to easily mold the insulation with vertical hole
Part, the vertical hole allow air into, and the dielectric constant of air is minimum, so as to reduce the dielectric constant of insulating element, and then drop
The decay of low wired signal transmission.
Brief description of the drawings
Fig. 1 is a kind of structural representation for coaxial cable that embodiment of the present utility model provides.
Fig. 2 is a kind of structural representation for insulating element with vertical hole that embodiment of the present utility model provides.
Fig. 3 is a kind of side structure schematic diagram for external mold that embodiment of the present utility model provides.
Fig. 4 is a kind of structure sectional view for external mold that embodiment of the present utility model provides.
Fig. 5 is a kind of structural representation for extruding machine that embodiment of the present utility model provides.
Main element symbol description：
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with specific embodiment.Obviously, institute
The embodiment of description is only a part of embodiment of the utility model, rather than whole embodiments.It is new based on this practicality
Embodiment in type, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Mode is applied, belongs to the scope of the utility model protection.It should be noted that " curing " is specifically by polytetrafluoroethyl-ne herein
Alkene and propellant compound sealing and standing at room temperature, it is therefore an objective to propellant and polytetrafluoroethylene (PTFE) powder is fully merged, be beneficial to
The follow-up progress for pushing processing." compacting " be specifically the compound cured is poured into binder cylinder, set certain pressure by
Step is compressing by compound, it is therefore intended that mixed air when removing polytetrafluoroethylene (PTFE) and propellant mixing." sintering " process
It is a kind of physical process, not sintered polytetrafluoroethylene (PTFE) macromolecular is the mixing of a kind of crystalline region and the amorphous area in elastomeric state
Thing, when temperature reaches 327 DEG C, crystalline region starts to disappear, and is transformed into unformed colloidal state, and at this moment macromolecular chain starts to spread, molecule
The motion result of chain, the hole come left by auxiliary agent volatilization is filled up, eliminated polytetrafluoroethylgranule granule because fixed during pushing
To internal stress caused by fibrosis etc., resin interface is set to disappear, macromolecular closely connects together.Unless otherwise defined,
All of technologies and scientific terms used here by the article is generally understood that with belonging to those skilled in the art of the present utility model
Implication it is identical.It is intended merely to describe specifically to implement in the title of technological means used in the description of the present utility model
The purpose of example, it is not intended that in limitation the utility model.
The utility model is by taking coaxial cable as an example, a kind of coaxial cable 10, as shown in figure 1, including coaxially setting from inside to outside
Inner wire 1, insulating element 2, outer conductor 3, the sheath 4 put.The function of the inner wire 1 is to transmit high frequency electric, due to height
Frequency electric current only flows through along conductive surface, conductor do not have electric current by, therefore, inner wire 1 can make hollow metal tube or
It is made of copper cover aluminum, Copper covered steel material, inner wire 1 is typically made up of solid copper conductor.The effect of insulating element 2 is to prevent
Leakage current radially, while internal and external conductor is played a supportive role, whole cable is formed stable entirety.Insulating element
The dielectric constant of the insulating materials of use is smaller, and the attenuation of cable is smaller.In the present embodiment, as shown in Fig. 2 the insulation
Part 2 is made of polytetrafluoroethylmaterial material, and the insulating element 2 is hollow structure, and circumferencial direction is evenly provided with its wall
Several to prolong the axially extending vertical hole 5 allowed air into, air accounting reaches more than 28% in the vertical hole of the insulating element, has
Relatively low dielectric constant, ensure that the coaxial cable of such a insulating element processing has a preferable decay indices, can be than phase under high frequency
The solid coaxial cable of same specification reduces decay up to more than 15%.Outer conductor 3 will also shield outer in addition to transmitting high frequency electric
The electromagnetic interference on boundary, leaks to prevent stop signal.Therefore outer conductor 3 should also possess preferable sealing in addition to resistance wants small
Energy.Outer conductor 3 can use close volume copper mesh or aluminum-plastic composite membrane to add thin copper mesh of compiling to be made, and wherein copper mesh can use zinc-plated copper wire to compile
Knit.Protective jacket 4 is made of plastic, to strengthen the resistant to mechanical damage of cable, the ability of resist chemical, plays protection to cable and makees
With.
The forming method of the insulating element of above-mentioned coaxial cable, comprises the following steps：
S100：A pushing die is provided, the pushing die includes external mold and internal model, and the external mold and internal model cooperatively form
Stream chamber, spreader is provided between the external mold and internal model, solid parts are fixed with the spreader；
S101：Insulation Material stream is injected into the stream chamber, the Insulation Material flows through the spreader shunting, the insulation
Stream coats the solid parts and molds vertical hole, and the insulating element with vertical hole is obtained after the demoulding.
In the step s 100, there is provided a pushing die, the pushing die include external mold 20 and internal model 30, the external mold 20
Stream chamber is ordinatedly formed with internal model 30, is provided with spreader 21 between the external mold 20 and internal model 30, in the spreader 21
Solid parts 22 are fixed with, solid parts 22 described in the present embodiment are a solid needle tubing.Specifically, referring to Fig. 3, in routine
On the basis of external mold, external mold 20 has increased spreader 21 and solid parts 22 newly, and several spreaders 21 are equally spaced in external mold
20 external mold aperture position, the top-slitting of spreader 21, several solid parts 22 insert the inside of spreader 21 and consolidated respectively
It is scheduled on spreader 21.Referring to Fig. 4, being divided into crush zone 23 and sizing area 24 inside external mold 20, spreader 21 is placed in described
In crush zone 23, solid parts 22 are fixed in spreader 21, and the length of solid parts 22 is longer than spreader 21, and are extended
Into sizing area 24.Pushing die is fixed on extruding machine 100, the structure of extruding machine 100 is referring to Fig. 5, extruding machine 100 wraps
Include external mold 20, internal model 30, cylinder barrel 40 and pushes guide rod 60 at outer mould base 50, and external mold 20 is fixed on outer mould base 50, and internal model 30 is fixed
On pushing guide rod 60 in cylinder barrel 40.The inside of internal model 30 is provided with outwardly directed hollow needle tubing 31, and the hollow needle tubing 31 allows
The inner wire 1 of coaxial cable 10 passes through from inside.
To prepare polytetrafluoroethylene (PTFE) prefabricated rods before step S101 progress, the making step of polytetrafluoroethylene (PTFE) prefabricated rods is such as
Under：A. sieving processing is carried out to polytetrafluoroethylene (PTFE) powder；B. the polytetrafluoroethylene (PTFE) powder after sieving is mixed with propellant,
Form compound；C. the compound is subjected to maturation process；D. the compound is suppressed, it is prefabricated to obtain polytetrafluoroethylene (PTFE)
Rod.
In step, sieving processing is carried out to polytetrafluoroethylene (PTFE) powder.Dispersed polytetrafluoroethylresin powder is under shear pressure
Easily cause fibrosis, therefore should avoid easily causing the utensil of its fibrosis using all.Polytetrafluoroethylene (PTFE) powder simultaneously
Electrostatic to draw dirt power strong, it should be noted that prevent being mixed into for dust.Violent vibration is avoided when moving polytetrafluoroethylene (PTFE) powder, with
Prevent powder agglomates.Polytetrafluoroethylene (PTFE) powder is carried out sieving material by material screening machine and is directly sieved into mixing machine.In sieve material process
In be careful not to powder to make dirty, in order to avoid the product being eventually fabricated is mingled with dirt, reduce the electrical characteristics of product.
In stepb, the polytetrafluoroethylene (PTFE) powder after sieving is mixed with propellant, forms compound.It is described to help
The composition for pushing away agent can be gasoline, petroleum ether or paraffin oil, and being added to reduce when pushing for propellant is sticked with power.Specifically
Ground, adds propellant in the mixing machine of the polytetrafluoroethylene (PTFE) powder after equipped with sieving, the polytetrafluoroethylene (PTFE) powder with it is described
The mass ratio of propellant seals the mixing machine between 0.21-0.23, to prevent propellant from volatilizing, mixing machine
It is placed on batch mixer and carries out batch mixing.
In step C, the compound is subjected to maturation process.Specifically, it is 32-38 in temperature range by the batch mixing
Sealing and standing 5-15 hours under conditions of DEG C, ensure that solvent naphtha can fully infiltrate polytetrafluoroethylene (PTFE) powder, have when pushing processing
Beneficial to the homogenization of product.
In step D, the compound is suppressed, to obtain polytetrafluoroethylene (PTFE) prefabricated rods.Compacting purpose is to remove polytetrafluoro
Air in ethene powder and propellant compound.It should be noted that polytetrafluoroethylene powder and propellant compound are suppressed
It is about smaller 1~2mm than cylinder barrel 30 into polytetrafluoroethylene (PTFE) prefabricated rods corresponding with the cylinder barrel 30 of pushing machine 100, diameter.Should not during compacting
There is additional shear power, the air that there should not be residual after pressurization inside polytetrafluoroethylene (PTFE) prefabricated rods.By the polytetrafluoroethylene (PTFE) after compacting
Prefabricated rods are directly moved into the cylinder barrel 30 of pushing machine 100.
In step S101, the polytetrafluoroethylene (PTFE) prefabricated rods are carried out with pushing processing, obtains the insulation division with vertical hole
Part semi-finished product.Specifically, referring to Fig. 5, inner wire 1 is connected by actinobacillus device through hollow needle tubing 31 with draught line, open
Dynamic extruding machine 100, rises the piston in cylinder barrel 40, promotes polytetrafluoroethylene (PTFE) prefabricated rods flow forward, polytetrafluoroethylene (PTFE) stream
After being extruded in cylinder barrel 40, it is coated on along hollow needle tubing 31 on inner wire 1, several spreaders on external mold 20 is flowed through when stream
At 21, stream is shunted, and after spreader 21, stream merges, and spreader 21 primarily serves fixed solid parts 22
Effect.The length of solid parts 22 is longer than spreader 23, and at the sizing area 24 for reaching external mold 20, stream is after spreader 21
Entirety is formed, but due to the presence of solid parts 22, when stream reaches sizing area 24, is just formed in the position of solid parts 23
Hole, forms the insulating element semi-finished product with vertical hole, the extruded velocity of the insulating element semi-finished product with vertical hole
For 8-9 ms/min.
Then by the insulating element semi-finished product sinter molding with vertical hole.Before sintering, the insulation division to extrusion is first had to
Part semi-finished product carry out drying and processing, it is therefore an objective to propellant is fully vapored away step by step.If the polytetrafluoroethylene (PTFE) after pushing
Semi-finished product are put into sintering stage at once, and the solvent naphtha inside semi-finished product does not escape fully, and the insulating element after sintering is easy
Longitudinal cracking is produced, causes voltage breakdown.
Because the freshly extruded loose softness of insulating element semi-finished product quality, mechanical strength are low, it is therefore necessary to which semi-finished product are entered
Row high temperature sintering.Sintering process is a kind of physical process, not sintered polytetrafluoroethylene (PTFE) macromolecular be a kind of crystalline region with it is high-elastic
The mixture of the amorphous area of state, when temperature reaches 327 DEG C, crystalline region starts to disappear, and is transformed into unformed colloidal state, at this moment big point
Subchain starts to spread, while also has the relaxation of strand, and optimal sintering temperature can make the diffusion process of strand fast
The progress of speed.The motion result of strand, the hole come left by solvent naphtha volatilization is filled up, eliminated resin particle because pushing
During internal stress caused by directional fiber etc., resin interface is disappeared, the close chain of macromolecular is together.Sintering temperature
Degree is higher than 327 DEG C of the fusing point of polyflon, but general control, at 360~370 DEG C, sintering temperature is too high to be caused absolutely
The aging or thermal decomposition of edge part make insulating element electric property and mechanical performance reduce, but sintering temperature is too low then can not be complete
The full gap eliminated inside insulating element, it equally can also make the degradation of insulating element.
Cooling procedure after sintering is insulating element recrystallization and the process of sizing.Cooling speed should be controlled in cooling
Degree, it is unsuitable it is too fast also should not be excessively slow, too fast that chilling temperature gradient can be made excessive, the inside and outside contraction of insulating element is uneven, in generation
Stress, it is likely to result in insulating element cracking phenomena.Starting stage, chilling temperature are arranged between 300-260 DEG C, and 260 DEG C are
The temperature that polytetrafluoroethylene (PTFE) crystallization terminates, follow-up phase carry out air natural cooling after being cooled to 260 DEG C.
It is understood that above-mentioned mould is not limited to be applied to coaxial cable, and can apply to be molded all has
The cable of insulating element；In addition, the effect of above-mentioned hollow needle tubing 31 is the hollow structure for molding the insulating element, and
When inner wire is embedded in, inner wire is integrally formed with insulating element after demoulding, and inner wire is embedded in the hollow bulb of the insulating element
Point.
Embodiment of above is only for explaining claims.Right the scope of protection of the utility model is not limited to
Bright book.Any one skilled in the art is in the technical scope that the utility model discloses, the change that can readily occur in
Change or replace, be included within the scope of protection of the utility model.
Claims (8)
1. a kind of mould of the insulating element of cable, the insulating element is provided with vertical hole, and the mould includes external mold
And internal model, the external mold and internal model cooperatively form stream chamber, it is characterised in that shunting is provided between the external mold and internal model
Bore, solid parts are fixed with the spreader, for molding the vertical hole of the insulating element.
2. the mould of the insulating element of cable as claimed in claim 1, it is characterised in that：The inner space of the external mold
Provided with crush zone and sizing area.
3. the mould of the insulating element of cable as claimed in claim 2, it is characterised in that：The external mold is additionally provided with stream
Entrance and stream outlet；The stream entrance is located at the crush zone, and the stream outlet is located at the sizing area.
4. the mould of the insulating element of cable as claimed in claim 3, it is characterised in that：The spreader is located at described
Stream porch.
5. the mould of the insulating element of cable as claimed in claim 4, it is characterised in that：The solid parts are from described
Stretch out, and extended in the sizing area inside spreader.
6. the mould of the insulating element of cable as claimed in claim 3, it is characterised in that：The internal model passes through the material
Inflow entrance is inserted in the external mold.
7. the mould of the insulating element of cable as claimed in claim 1, it is characterised in that：The insulating element is hollow
Structure and wall are provided with the vertical hole, outwardly directed hollow needle tubing are provided with inside the internal model, for molding the insulation
The hollow structure of part.
8. the mould of the insulating element of cable as claimed in claim 1, it is characterised in that：The solid parts are solid
Needle tubing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720972618.3U CN207038253U (en) | 2017-08-04 | 2017-08-04 | The mould of the insulating element of cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720972618.3U CN207038253U (en) | 2017-08-04 | 2017-08-04 | The mould of the insulating element of cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207038253U true CN207038253U (en) | 2018-02-23 |
Family
ID=61474856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720972618.3U Active CN207038253U (en) | 2017-08-04 | 2017-08-04 | The mould of the insulating element of cable |
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| CN (1) | CN207038253U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108630356A (en) * | 2018-05-04 | 2018-10-09 | 邵春雷 | A kind of intelligent high temperature electric wire manufacture complete set of equipments |
| CN109036717A (en) * | 2018-08-06 | 2018-12-18 | 深圳市关西实业有限公司 | A kind of half burns low-density flexible coaxial cable and preparation method thereof |
-
2017
- 2017-08-04 CN CN201720972618.3U patent/CN207038253U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108630356A (en) * | 2018-05-04 | 2018-10-09 | 邵春雷 | A kind of intelligent high temperature electric wire manufacture complete set of equipments |
| CN109036717A (en) * | 2018-08-06 | 2018-12-18 | 深圳市关西实业有限公司 | A kind of half burns low-density flexible coaxial cable and preparation method thereof |
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