CN110415890A - The manufacturing method of fire-resisting cable - Google Patents
The manufacturing method of fire-resisting cable Download PDFInfo
- Publication number
- CN110415890A CN110415890A CN201910643007.8A CN201910643007A CN110415890A CN 110415890 A CN110415890 A CN 110415890A CN 201910643007 A CN201910643007 A CN 201910643007A CN 110415890 A CN110415890 A CN 110415890A
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- cable
- conductor
- fire
- manufacturing
- bending section
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0006—Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
Abstract
The invention discloses a kind of manufacturing methods of fire-resisting cable, comprising the following steps: step 1, by winding machine wrapped formation wrapping layer on conductor on conductor, then passes through extruding machine and by insulation extrusion and is wrapped in wrapping layer, obtain one or more cable cores with this；Step 2, the head of one or more cable cores is peeled off, in air by the conductor exposure in each cable core；Step 3, it is attached using draught line and the aerial conductor of one or more exposure；Step 4, draught line is passed through into extruding machine and cable drawing machine, makes one or more cable cores mobile under the traction of cable drawing machine；Step 5, extrusion molding is carried out to the mobile cable core of one or more by extruding machine, the sheath for wrapping up one or more cable cores is formed, so as to form the cable.Method of the invention has the advantages that be avoided that cable destroys wrapping layer and insulating layer in traction.
Description
Technical field
The present invention relates to a kind of manufacturing methods of fire-resisting cable.
Background technique
The cable core of cable is generally made of conductor, wrapping layer, insulating layer, and wrapping layer is wrapped on conductor, and insulating layer passes through
Extruding machine squeezes insulation in wrapping layer, after cable core completes, it is also necessary to be twisted cable core and squeeze out sheath again, keep sheath logical
Extrusion molding mode is crossed to be wrapped on cable core.In cable production process, various processes need to connect draught line, i.e., by draught line and cable
Core is attached, and goes on smoothly each process by the traction of draught line.
It is directly to fasten the head of entire cable core and draught line by the usual manner that cable core is connect with draught line, due to electricity
Cable cable core is generally made of conductor, wrapping layer, insulating layer.In the mode adopted and above this routinely connects cable core and draught line, leading
During drawing, cable core is towed power meeting, and deformation occurs, i.e., cable core can stretch elongated deformation.
However, the thickness very little of wrapping layer, is highly susceptible to destroy during stretching, insulation performance, cable are influenced
Wrapping layer uses mica tape, and the micaceous structure in mica tape is layer structure, and is adhered on wire side, under a stretching force
Its intensity can be ignored, therefore greatly may be bad by drawing in the case where stress.
In addition, under internal stress, conductor, insulating layer, wrapping layer can be from the states after deformation after traction
State before being restored to deformation, i.e. conductor, wrapping layer, insulating layer can be shunk after the stretch, but due to conductor, wrapping layer, insulation
The material of layer is not identical, and the different speed that it shrinks of material are also different, and metallic conductor resume speed is most slow, the speed that insulating layer is shunk
Spend relatively fast, therefore will lead to and to form speed difference, conductor retraction speed is slower than insulation retraction, so conductor with respect to wrapping layer with
Insulating layer is elongated, and the conductor of additional length is easy to poke in continuing contraction process insulating layer, but due to the thickness of sheath compared with
Thickness, sheath will not be stabbed, and cable core is wrapped up by sheath, and conductor will not be found after having poked insulating layer in above process.
Due to the cable core in cable be it is multiple, once these conductors for poking insulating layer touch together, will cause cable makes
Used time short circuit, therefore there is the hidden danger for influencing product quality in the former mode of connection, relative to cable, mica tape is same in retraction process
Sample can be damaged, and directly affect fire-resistance property, and there are the hidden danger of quality.
Summary of the invention
Present invention aims in providing a kind of manufacturing method of fire-resisting cable, method of the invention can avoid cable and draw
When destroy wrapping layer and insulating layer.
The technical solution for solving above-mentioned technical problem is as follows:
The manufacturing method of fire-resisting cable, comprising the following steps:
Step 1, by winding machine wrapped formation wrapping layer on conductor on conductor, then insulating layer is squeezed by extruding machine
It out and is wrapped in wrapping layer, one or more cable cores is obtained with this；
Step 2, the head of one or more cable cores is peeled off, in air by the conductor exposure in each cable core；
Step 3, it is attached using draught line and the aerial conductor of one or more exposure；
Step 4, draught line is passed through into extruding machine and cable drawing machine, one or more is made under the traction of cable drawing machine
A cable core is mobile；
Step 5, extrusion molding is carried out to the mobile cable core of one or more by extruding machine, is formed and wraps up one or more cable cores
Sheath, so as to form the cable.
Advantages of the present invention are as follows: after the present invention is by the way that the conductor in draught line and cable conductor to be attached, cable exists
Distraction procedure only has conductor to be pulled active force, and the insulating layer and wrapping layer in cable core do not stress, avoids wrapped
The adverse consequences that layer is destroyed.In addition, due in cable core insulating layer and wrapping layer do not stress, insulating layer and around
Covering will not be stretched, in addition the amount of tension of conductor is relatively small, so that conductor be avoided to poke insulating layer in contraction process
Problem.Therefore, method of the invention ensures the quality of the cable of production.
Detailed description of the invention
Fig. 1 is the block diagram that the manufacturing method of fire-resisting cable of the invention circulates；
Fig. 2 is the structural schematic diagram that the guiding in the present invention in cable is connect with draught line；
Fig. 3 is the structural schematic diagram of cable conductor winding machine of the present invention；
Fig. 4 is the main view of the first dust-proof mechanism in invention；
Fig. 5 is the top view of the first dust-proof mechanism in the present invention；
Fig. 6 is the sectional view of the seal member in the present invention；
Fig. 7 is the schematic diagram of the cable drawing machine in the present invention；
Label in attached drawing:
A is cable core, and B is winding machine, and C is the first up- coiler, and D is cable drawing machine, and E is extruding machine, and F is cooling body, G
For the second up- coiler, H is cable；
A is conductor, and b is wrapping layer, and c is insulating layer, and d is draught line, and e is bending section, and f is back bending section, and g is spiral winding
Portion, h are sheath；
1 is support device, and 2 be directive wheel, and 3 be the first wrapping mechanism, and 4 be the first guide pipe, and 5 be traction mechanism, and 6 be the
One hermatic door, 6a are transparent component, and 6b is seal member, and 6c is hinge member, and 6d is opening, and 7 be the first cover board, 7a first
Notch, 8 be support member, and 9 be the second support member, and 10 be the second wrapping mechanism, and 11 be the second guide pipe, and 12 is dust-proof for second
Mechanism；
13 be belt pulley, and 14 be belt, and 15 be linear actuator, and 16 be swing seat, and 17 be directive wheel, and 18 be elastic portion
Part, 19 be sensor.
Specific embodiment
As depicted in figs. 1 and 2, the manufacturing method of fire-resisting cable of the invention, comprising the following steps:
Step 1, by winding machine wrapped formation wrapping layer b on conductor a on conductor, then pass through extruding machine for insulating layer
C is squeezed out and is wrapped on wrapping layer b, obtains one or more cable cores with this；
, one or more cable core A are obtained with this, insulating layer c is wrapped on wrapping layer b by way of extrusion molding, insulating layer c
Diameter it is smaller, therefore, do not need generally to draw in extrusion process.The cable core A made of winding machine B passes through the first up- coiler
C is wound, in case cable core A extrusion molding.
Step 2, the head of one or more cable core A is peeled off, in air by the conductor a exposure in each cable core A.
Step 3, it is attached using draught line d and the aerial conductor a of one or more exposure；Draught line d with lead
The preferred embodiment of body a connection are as follows: bending section e and back bending will be formed after aerial 180 ° of a part bending of conductor a exposure
Section f, one end of draught line d is wrapped in a manner of spiral winding form spiral winding portion g on conductor a and back bending section f after, lead
One end of lead d and back bending section f and/or conductor a are fastened, and the other end of draught line d is curved across conductor a and back bending section f
After pars convoluta e, spiral winding portion g and bending section e formation is supported, and is leading the position of supporting of spiral winding portion g and bending section e
Active force is towed during drawing.Preferred mode is using having sticking adhesive tape for back bending section f, spiral winding portion g, curved
Pars convoluta e and conductor a are bonded, to increase the reliability of conductor a Yu draught line d.One or more cable core A are passed through into stranding
Process dresses up stranding, in case extruding machine squeezes out sheath E.
Step 4, by draught line pass through extruding machine and cable drawing machine D, make under the traction of cable drawing machine one or
Multiple cable cores are mobile.
Step 5, extrusion molding is carried out to the mobile cable core of one or more by extruding machine E, is formed and wraps up one or more cables
The sheath h of core, so as to form the cable H.Before drawing by cable drawing machine D to cable core, the cable come is extruded
Send after cooling down to cable drawing machine D by cooling body F (such as sink) and be drawn.It is drawn by cable drawing machine D
Cable afterwards is wound by the second up- coiler G, in order to be collected and transport.
As shown in figure 3, winding machine B includes support device 1, directive wheel 2, the first wrapping mechanism 3, the first guide pipe 4, traction
Mechanism 5, the first dust-proof mechanism, support device 1 include cabinet body and the controller being set on cabinet body, and controller controls directive wheel
2, the mechanisms such as the first wrapping mechanism 3, the first guide pipe 4, traction mechanism 5 work, and support device 1 is the prior art, tool
Body structure does not make excessive elaboration herein.
As shown in figure 3, directive wheel 2 is set to the lower part of support device 1, the electricity released from pay off rack (not shown)
Cable cable core enters in the first wrapping mechanism 3 from the lower part of support device 1 to carry out wrapped, and directive wheel 2 is oriented to cable core, with
It is entered in the first wrapping mechanism 3 convenient for cable core.First wrapping mechanism 3 is arranged in support device 1 and is located under directive wheel 2
The downstream in support device 1 and being located at the first wrapping mechanism 3 is arranged in trip, the first guide pipe 4, and the setting of traction mechanism 5 is supporting
The top of device 1.
As shown in Figure 3 and Figure 4, the first dust-proof mechanism includes the first hermatic door 6 and the first cover board 7, the first hermatic door 6
For lower support on the first wrapping mechanism 3, the top of the first hermatic door 6 is arranged in the first cover board 7, in the upper of the first hermatic door 6
Portion is equipped with support member 8, which is fixed by bonding with the first hermatic door, and one end of the first cover board 7 is supported on first
In support member 8.The both ends of first hermatic door 6 are connect with support device 1 respectively.In this way, the first dust-proof mechanism is wrapped by first
Mechanism 3 forms the effect shrouded, so that the first wrapping mechanism 3 be made to carry out wrapped work in closed space.
As shown in Figures 3 to 6, the first cover board 7 cooperates with support device 1, and the second support member is equipped in support device 1
9, the other end of first cover board 7 is supported in the second support member 9, and the first cover board 7, which is placed on, is supported on the first support portion
On part 8 and the second support member 9, the first cover board 7 and the first support member 8 and the second support member 9, which are formed, to be sealed, according to wrapped
Situation can be convenient for taking the first cover board 7 away.First cover board 7 is equipped with the first notch 7a, and first guide pipe 4 passes through the first notch
7a.First cover board 7 is made of transparent material, for example, the first cover board 7 is made of glass or transparent plastic sheet, preferentially
Using transparent plastic sheet.
As shown in Figures 3 to 6, first hermatic door 6 includes transparent component 6a, seal member 6b and hinge member
6c, the transparent component 6a be it is multiple, between two neighboring transparent component 6a be equipped with the seal member 6b, it is two neighboring transparent
Component 6a is connected by hinge member 6c.The first hermatic door being formed by connecting by multiple transparent component 6a, can not only reduce
The manufacture difficulty of bright component reduces cost, but also adapts to the structure of support device 1.
As shown in Figures 3 to 6, the seal member 6b is fixedly connected with transparent component 6a.The two of the seal member 6b
End is respectively equipped with opening 6d, and seal member 6b is clipped on transparent component 6a, i.e. the end of transparent component 6a is inserted into seal member
In the opening 6d of 6b, seal member 6b is hinged component 6c and is pressed on transparent component 6a.Hinge member 6c uses hinge, hingedly
Component 6c is connect using screw with transparent component 6a.Transparent component 6a is glass or transparent plastic sheet, and transparent component 6a is preferential
Using transparent plastic sheet.
As shown in figure 3, further including the second wrapping mechanism 10, the second guide pipe 11, the second dust-proof mechanism 12, the second winding machine
Structure 10 is arranged in support device 1 and is located at the downstream of the first guide pipe 4, the second guide pipe 11 be arranged in support device 1 and
Positioned at the downstream of the second wrapping mechanism 10, the second dust-proof mechanism 12 includes the second hermatic door and the second cover board, the second hermatic door
Lower support on the second wrapping mechanism 10, the second cover board is arranged in the top of the second hermatic door, and the second cover board and support fill
1 cooperation is set, the both ends of the second hermatic door are connect with support device 1 respectively, and the second cover board is equipped with the second notch, and described second leads
The second notch is passed through to pipe 11.The structure of second dust-proof mechanism 12 is identical as the structure of the first dust-proof mechanism, and therefore not to repeat here.
It moves under the draw of traction mechanism 5 after the guiding that cable core A passes through directive wheel 2, in moving process, passes through
The progress of first wrapping mechanism 3 is wrapped for the first time, and wrapped by second of the progress of the second wrapping mechanism, wrapped number is as needed
It is selected.The present invention effectively prevents dust and winged silk by the first dust-proof mechanism and the second dust-proof mechanism, and can observe
Internal wrapped situation.Due to it is wrapped be circular motion, using fritter transparent component 6a splice, centre with hinge member 6c cut with scissors
It connects, and closes the gap of junction with seal member 6b, can not only observe inner case in this way but also energy blocks dust, moreover it is possible to give
Inside provides circular motion space, and the first cover board is installed above the first wrapping mechanism, prevents dust by the first cover board, flies silk
It flies out, dust is flown into silk with dust exhaust apparatus after the completion of wrapped and unifies dust suction processing.
As shown in fig. 7, the cable drawing machine D in the present invention includes the traction that a pair being arranged symmetrically translates cable H
Mechanism, traction mechanism include: at least two belt pulleys 13, the belt 14, at least two of closure setting over pulleys carried according to shield
Set h outer diameter drives belt to be moved to distracted position traction guiding mechanism, which includes: linear actuator 15, In
In distraction procedure according to cable generate opposition direction swung swing seat 16, directive wheel 17, swing seat 16 with
The power output end of linear actuator 15 is flexibly connected, and directive wheel 17 is movably connected in swing seat 16.Linear actuator 15 can
With using the mechanisms such as cylinder, hydraulic cylinder or electronic screw rod, in the present embodiment, linear actuator 15 preferentially uses cylinder.
As shown in fig. 7, cable H passes through traction mechanism, clamped in upper and lower two belts 14 and with the work of belt 14
In the case of, cable H is mobile to be drawn with belt 14.However, cable H by cable drawing machine D draw when, with volume Two
Around machine G to cable H winding after, the diameter of the coil of cable on the second up- coiler G constantly changes, in this way, cable go out draw
In an angle, therefore, cable H can generate different journeys when being drawn by cable drawing machine D to shape between the second up- coiler G when machine
The fluctuation of degree, that is, not being is constantly to move along a straight line, but constantly upwardly or downwardly rise and fall, in this way, cable H is to cable pulling
Machine D generates the active force of fluctuation.And the sheath h on the cable H due to being drawn by cable drawing machine D has just been formed through high temperature extrusion,
Although by cooling body cooling, but still remaining with certain temperature and being in easily-deformable state, if the clamping of belt 14
Active force is invariable, although the radian very little of fluctuation, but still it is easy to cause cable H to deform in distraction procedure.Therefore, In
In the present invention, swing seat 16 is to be flexibly connected with the connection type of linear actuator 15, when cable H fluctuation, what cable H was generated
Wave action power acts on belt 14, and being transmitted in swing seat 16 by belt 14 swings swing seat 16, with adjustment
Swing seat 16 passes through the active force that belt 13 generates, so that the active force that cable H generates swing seat 16 to cable when fluctuating obtains
Small adjustment is obtained, is deformed in by cable drawing machine D distraction procedure to avoid cable H.
In addition, the angle of above-mentioned formation influences corresponding since the take-up between the second up- coiler G and dragger is apart from too small
Larger, active force is larger on effect cable, slows down shape after the swing seat 16 at position dragger line outlet is swung out with fine tuning
Variable prevents crawler belt pressure from crossing senior general so that reducing influences cable active force, and selects proper air pressure according to the outside diameter of cable
Cable flattens, and guarantees cable roundness.
As shown in fig. 7, the traction mechanism further includes the elastomeric element 18 for limiting swing seat oscillator arc, the elastomeric element
18 one end and linear actuator 15 cooperate, and the other end and swing seat of elastomeric element 18 cooperate.Although swing seat 16 can be sent out
It is raw to swing, but the radian swung cannot be excessive, otherwise influences whether that the speed of traction is affected, therefore, leads in the present invention
The oscillator arc that elastomeric element 18 limits swing seat 16 is crossed, swing seat 16, directive wheel 17 is promoted to form the shape of tensioning to belt 14
State to guarantee the frictional force between belt 14 and cable H, and then guarantees the propulsive efficiency of cable H.
As shown in fig. 7, the elastomeric element 18 preferably use spring, the preferential monthly ticket conical helical spring of spring,
The miner diameter end and linear actuator of conical helical spring cooperate, and the bigger diameter end and swing seat of conical helical spring cooperate.Circular cone spiral shell
The bigger diameter end and swing seat that revolve spring can increase the contact area of conical helical spring and swing seat, thus by the pendulum of swing seat
Width is limited in the range of needs.
As shown in fig. 7, cable drawing machine D further includes the sensor 19 of position detection 16 displacement of swing seat, the sensor 19
One end connect with swing seat 16.Gone up and down when under driving effect of the swing seat 16 in linear actuator 15, sensor 19 with
The lifting of swing seat 16 and work, to constantly detect the displacement of swing seat 16, by displacement feedback to controller
(not shown) to control the work of linear actuator 15, and then accurately controls the position of swing seat 16, keeps belt 14 accurate
It is moved to the position for needing trailing cable H, is also possible to prevent the excessive influence cable roundness of pressure.Sensor 19 is preferably using electricity
Resistive is displaced quantity sensor.
Since there are sensor 19 in the two sides up and down in cable H, pass through the sensing positioned at the two sides up and down of cable H
Spacing between device 19, after linear actuator 15 drives swing seat 16 to act on belt 14 on cable H, controller can be counted
The spacing between two belts 14 of diameter of cable H is calculated, controller is according between the size and belt 14 of cable H diameter
Away from control linear actuator 15 is finely adjusted the active force of belt 14, so that cable H roundness in by distraction procedure
It is unaffected.
Claims (10)
1. the manufacturing method of fire-resisting cable, which comprises the following steps:
Step 1, on conductor through winding machine wrapped formation wrapping layer on conductor, then by extruding machine by insulation extrusion simultaneously
It is wrapped in wrapping layer, one or more cable cores is obtained with this；
Step 2, the head of one or more cable cores is peeled off, in air by the conductor exposure in each cable core；
Step 3, it is attached using draught line and the aerial conductor of one or more exposure；
Step 4, draught line is passed through into extruding machine and cable drawing machine, one or more cables is made under the traction of cable drawing machine
Core is mobile；
Step 5, extrusion molding is carried out to the mobile cable core of one or more by extruding machine, forms the shield for wrapping up one or more cable cores
Set, so as to form the cable.
2. the manufacturing method of fire-resisting cable according to claim 1, which is characterized in that in step 3, conductor is exposed to
Bending section is formed after 180 ° of a part bending in air and back bending section, one end of draught line are wound in a manner of spiral winding
After forming spiral winding portion on conductor and back bending section, one end of draught line and back bending section and/or conductor are fastened, draught line
Behind bending section of the other end across conductor and back bending section, spiral winding portion forms with the bending section and supports, and twines spiral
Position of supporting around portion and bending section is towed active force in distraction procedure.
3. the manufacturing method of fire-resisting cable according to claim 2, which is characterized in that further include using the sticking glue of tool
Band bonds back bending section, spiral winding portion, bending section and conductor.
4. the manufacturing method of fire-resisting cable according to claim 1, which is characterized in that the winding machine includes support dress
It sets, directive wheel, the first wrapping mechanism, the first guide pipe, traction mechanism, the directive wheel is set to the lower part of support device, the
The downstream in support device and being located at directive wheel is arranged in one wrapping mechanism, and the first guide pipe is arranged in support device and is located at
The top of support device is arranged in the downstream of first wrapping mechanism, traction mechanism, which is characterized in that further includes the first dust-proof machine
Structure, first dust-proof mechanism include the first hermatic door and the first cover board, and the lower support of the first hermatic door is in the first winding machine
On structure, the top of the first hermatic door is arranged in the first cover board, and the first cover board and support device cooperate, the both ends point of the first hermatic door
It is not connect with support device, the first cover board is equipped with the first notch, and first guide pipe passes through the first notch.
5. the manufacturing method of fire-resisting cable according to claim 4, which is characterized in that first hermatic door includes transparent
Component, seal member and hinge member, the transparent component be it is multiple, between two neighboring transparent component be equipped with the sealing
Component, two neighboring transparent component are connected by hinge member.
6. the manufacturing method of fire-resisting cable according to claim 1, which is characterized in that the cable drawing machine is including being in pair
The traction mechanism for claiming a pair of arrangement to translate cable, traction mechanism include:
At least two belt pulleys；
The belt of closure setting over pulleys carried；
At least two drive belt to be moved to distracted position traction guiding mechanism, the traction guiding mechanism packet according to outer diameter sheath
It includes:
Linear actuator；
The swing seat swung in distraction procedure according to the direction that cable generates opposition, the swing seat and straight line drive
The power output end of dynamic device is flexibly connected；
Directive wheel, directive wheel are movably connected in swing seat.
7. the manufacturing method of fire-resisting cable according to claim 6, which is characterized in that the traction mechanism further include:
The elastomeric element of swing seat oscillator arc is limited, one end of the elastomeric element and linear actuator cooperate, elastomeric element
The other end and swing seat cooperate.
8. the manufacturing method of fire-resisting cable according to claim 7, which is characterized in that the elastomeric element is spring.
9. the manufacturing method of fire-resisting cable according to claim 8, which is characterized in that the spring is trochoid spiral bullet
Spring, the miner diameter end and linear actuator of conical helical spring cooperate, and the bigger diameter end and swing seat of conical helical spring cooperate.
10. the manufacturing method of fire-resisting cable according to claim 6, which is characterized in that cable drawing machine further includes position inspection
The sensor of swing seat displacement is surveyed, one end of the displacement amount detector is connect with swing seat.
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| CN201910643007.8A CN110415890B (en) | 2019-07-17 | 2019-07-17 | Method for manufacturing fire-resistant cable |
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|---|---|---|---|
| CN201910643007.8A CN110415890B (en) | 2019-07-17 | 2019-07-17 | Method for manufacturing fire-resistant cable |
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| CN111029040A (en) * | 2019-12-18 | 2020-04-17 | 南通沃斯通线缆科技有限公司 | Driving water-blocking lead for continuously vulcanizing large-section product and connector thereof |
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