CN118538485B - Production method of low-temperature-resistant cable - Google Patents
Production method of low-temperature-resistant cable Download PDFInfo
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- CN118538485B CN118538485B CN202410761410.1A CN202410761410A CN118538485B CN 118538485 B CN118538485 B CN 118538485B CN 202410761410 A CN202410761410 A CN 202410761410A CN 118538485 B CN118538485 B CN 118538485B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000001125 extrusion Methods 0.000 claims abstract description 161
- 239000011241 protective layer Substances 0.000 claims abstract description 92
- 238000001816 cooling Methods 0.000 claims abstract description 71
- 239000002994 raw material Substances 0.000 claims abstract description 66
- 238000005070 sampling Methods 0.000 claims abstract description 39
- 239000004020 conductor Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000004088 foaming agent Substances 0.000 claims abstract description 19
- 238000011156 evaluation Methods 0.000 claims abstract description 15
- 238000013441 quality evaluation Methods 0.000 claims abstract description 15
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- 239000010410 layer Substances 0.000 claims description 64
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- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000004800 polyvinyl chloride Substances 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 5
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000004014 plasticizer Substances 0.000 claims description 3
- 230000001902 propagating effect Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 17
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- 230000002238 attenuated effect Effects 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
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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
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers 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
- H01B13/0036—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
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of cable manufacture, and provides a production method of a low-temperature-resistant cable, which comprises the following steps that S1, a raw material processing module processes raw materials and supplies the processed raw materials to an extrusion module; the method comprises the steps of S2, extruding raw materials through an extrusion module and wrapping the raw materials on the periphery of a conductor to form a low-temperature protective layer, S3, injecting chemical or physical foaming agents into the raw materials in the extrusion process of the extrusion module through a bubble module to form tiny bubbles in the low-temperature protective layer, S4, solidifying and cooling the low-temperature protective layer through a solidifying and cooling module and collecting state data of the low-temperature protective layer through a sampling module, S5, obtaining the state data obtained through sampling by the sampling module through a quality evaluation module and evaluating the formed low-temperature protective layer to form an evaluation result, S6, obtaining the evaluation result and a set qualified threshold range through a regulating and controlling module, and dynamically adjusting extrusion parameters of the extrusion module if trigger conditions are met.
Description
Technical Field
The invention relates to the technical field of cable manufacturing, in particular to a production method of a low-temperature-resistant cable.
Background
In extremely low temperature environments, conventional cable insulation materials (such as ordinary polyethylene or PVC) may become brittle and hard, thereby affecting their mechanical properties and electrical safety.
Although the abrasion resistance of the cable is improved by the cooperation of the rubber abrasion-resistant outer skin, the filling cotton net, the supporting plate, the low-temperature-resistant layer and the tension mechanism which are arranged on the periphery of the cable, the weight of the cable has a great influence on the operation performance and the energy efficiency, and meanwhile, the weight of the cable is increased by the traditional solid insulating material, so that the performance optimization of the applications is limited.
Meanwhile, in conventional cable production, the quality and consistency of the insulating layer are often difficult to monitor in real time on a production line, so that the cable quality problem can be discovered in a later test, and the production efficiency and the cost control are affected.
In addition, the low temperature environment may accelerate the aging process of certain insulating materials, such as breaking the polymer network or changing the crosslinking density, thereby reducing the service life and safety of the cable, and under the low temperature condition, the toughness of the material is reduced, and mechanical damage is more likely to occur.
The invention is designed for solving the problems of poor protection effect, extremely easy aging, difficult quality control, lack of online evaluation, difficult guarantee of cable toughness, intelligent degree and the like in the prior art.
Disclosure of Invention
The invention aims to provide a production method of a low-temperature-resistant cable aiming at the defects existing at present.
In order to overcome the defects in the prior art, the invention adopts the following technical scheme:
A method of producing a low temperature resistant cable, the method comprising the steps of:
S1, a raw material treatment module is used for treating raw materials and supplying the treated raw materials to an extrusion module;
S2, extruding the raw materials through the extrusion module and wrapping the raw materials on the periphery of the conductor to form a low-temperature protective layer;
s3, injecting a chemical or physical foaming agent into the raw materials in the extrusion process of the extrusion module through a bubble module so as to form micro bubbles in the low-temperature protective layer;
s4, solidifying and cooling the low-temperature protection layer through a solidifying and cooling module, and collecting state data of the low-temperature protection layer through a sampling module;
S5, acquiring the state data obtained by sampling by the sampling module through a quality evaluation module, and evaluating the formed low-temperature protection layer to form an evaluation result;
s6, acquiring the evaluation result and a set qualified threshold range through a regulation and control module, and dynamically adjusting extrusion parameters of the extrusion module if a trigger condition is met;
And S7, extruding and wrapping the insulating material outside the low-temperature protection layer through an insulating protection module to form an outer protection layer.
Optionally, the production method of the low-temperature-resistant cable further comprises the step that the sampling module collects the state data of at least two angles of the periphery of the low-temperature protection layer in the process of sampling the low-temperature protection layer.
Optionally, in step S2, during the extrusion process of the extrusion module, the conductor is pulled by a pulling module, so that the conductor is wrapped with the low-temperature protection layer;
wherein, the pulling speed of the pulling module is matched with the extrusion speed of the extrusion module.
Optionally, the production method of the low-temperature-resistant cable further comprises the step of adding a low-temperature plasticizer DOA or a flexible epoxy compound in the treatment process of the raw materials.
Optionally, in step S7, the insulating material used by the insulating protection module includes at least one of polyethylene, crosslinked polyethylene, polyvinyl chloride, polyvinylidene fluoride, polyetheretherketone, or polyimide.
Optionally, the production method of the low-temperature-resistant cable further comprises the step S5 of enabling the state data to comprise temperature T, attenuation coefficient A of sound waves in the low-temperature protective layer, density D of the low-temperature protective layer and elastic modulus E.
Optionally, in step S5, the quality evaluation module obtains the State data acquired by the sampling module, and calculates a State index State of the low-temperature protection layer according to the following formula:
Wherein T is the temperature of the low-temperature protective layer, A is the attenuation coefficient of sound waves in the low-temperature protective layer, D is the density of the low-temperature protective layer, and E is the elastic modulus of the low-temperature protective layer.
Optionally, the production method of the low temperature resistant cable further comprises the following steps that in step 6, the triggering condition is set as follows:
The State index State exceeds a set qualification threshold range.
Optionally, the production method of the low-temperature-resistant cable further comprises the step of cooling the outer protective layer through a cooling module after the outer protective layer is obtained.
The beneficial effects obtained by the invention are as follows:
1. the low-temperature protection layer is formed into a bubble structure through the mutual matching of the extrusion module and the bubble module, the low-temperature resistance of the cable is improved, and the whole cable production process is guaranteed to have the advantages of high low-temperature resistance, high manufacturing process accuracy, good cable protection effect and high cable toughness;
2. through the mutual matching of the solidifying unit and the cooling unit, the low-temperature protective layer can be solidified and crosslinked, the strength of the low-temperature protective layer is improved, and the stability and the reliability of the foam structure of the low-temperature protective layer are maintained;
3. The quality in the cable production process can be monitored and evaluated through the mutual matching of the sampling module and the quality evaluation module, the reliability and the accuracy of the whole cable preparation process are improved, and the whole system is ensured to have the advantages of accurate quality control, high intelligent degree and good low-temperature anti-freezing effect;
4. Through the mutual matching of the traction module and the extrusion module, the production process of the cable is more efficient, and the whole system is guaranteed to have the advantages of high intelligent degree, high low temperature resistance of the cable, high traction stability and high synchronous traction reliability;
5. through mutually supporting of insulating protection module and cooling module for outermost inoxidizing coating manufacturing accuracy is higher, guarantees that entire system has that the protection effect is good, quality control is accurate, cable toughness is good and intelligent degree is high advantage.
Drawings
The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate like parts in the different views.
FIG. 1 is a flow chart of the steps of the production method of the present invention.
Fig. 2 is a block schematic diagram of the production system of the present invention.
Fig. 3 is a schematic diagram of an evaluation flow of the sampling module and the quality evaluation module according to the present invention.
Fig. 4 is a schematic top view of the production system of the present invention.
Fig. 5 is a schematic cross-sectional view of the pulling module of the present invention.
Fig. 6 is a schematic cross-sectional view at A-A in fig. 4.
Fig. 7 is an enlarged schematic view at C in fig. 6.
Fig. 8 is an enlarged schematic view at E in fig. 7.
Fig. 9 is an enlarged schematic view at B in fig. 6.
Fig. 10 is a schematic diagram of an application scenario of the curing unit of the present invention for curing the low-temperature protection layer.
Fig. 11 is a schematic diagram of an application scenario of the cooling unit of the present invention for performing a cooling operation on a low-temperature protection layer.
Fig. 12 is a schematic structural diagram of a sampling module according to the present invention.
FIG. 13 is a schematic top view of a portion of a test seat, steering gear and positioning marker of the present invention.
Fig. 14 is a schematic side view of the insulation protection module of the present invention.
Fig. 15 is an enlarged schematic view at D in fig. 14.
Fig. 16 is a schematic diagram of an application scenario in which a cooling module of the present invention performs a cooling operation on an outer protection layer.
The reference numerals show that 1, a conductor, 2, a traction track, 3, a connecting seat, 4, an electronic pressure release valve, 5, a clamping air bag, 6, an extrusion module, 7, a solidification cavity, 8, a water storage tank, 9, a sampling module, 10, an insulation protection module, 11, a cooling module, 12, a cooling water tank, 13, a positioning mark piece, 14, a low-temperature protection layer, 15, a solidification lamp, 16, an atomization spray head, 17, a cooling pipeline, 18, a steering driving mechanism, 19, an identification probe, 20, a detection base, 21, a limit rod, 22, a sliding track, 23, a steering gear, 24, a detection seat, 25, an ultrasonic emitter, 26, an ultrasonic collector, 27, an extrusion cavity, 28, an extrusion driving mechanism, 29, an extrusion die, 30, an extrusion screw, 31, a bubble module, 32, a supply cavity, 33, a stirring rod, 34, a stirring driving mechanism, 35, a heating piece, 36, a supply screw, 37, a supply driving mechanism, 38, an extrusion cavity, 39, an extrusion driving mechanism, 40, an extrusion die, 41, a heating piece, 42, a heating cavity, 43A, a beta sensor, 43, a gamma sensor, a 45, a liquid crystal display, a 48, a transmission cavity, a 50, a cooling cavity, a transmission cavity, a gamma sensor, a 46, a cooling cavity, a transmission cavity, a 50, a cooling cavity, a transmission cavity, a gamma sensor, a 46.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all without departing from the spirit of the present invention. The drawings of the present invention are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
Embodiment one, according to the embodiments shown in fig. 1, 2,3, 4, 5, 6, 7, 8, 9, 10,11,12, 13, 14, 15 and 16, the method for producing a low temperature resistant cable includes the following steps:
S1, a raw material treatment module is used for treating raw materials and supplying the treated raw materials into an extrusion module 6;
s2, extruding the raw materials through the extrusion module 6 and wrapping the raw materials on the periphery of the conductor 1 to form a low-temperature protective layer 14;
Wherein, in the present embodiment, the extrusion module 6 may be adapted to extrude and wrap the raw material around the periphery of the conductor 1 wrapped with the protective sleeve (inner protective layer);
S3, injecting chemical or physical foaming agents into the raw materials in the extrusion process of the extrusion module 6 through a bubble module 31 so as to form micro bubbles in the low-temperature protective layer 14;
s4, solidifying and cooling the low-temperature protection layer 14 through a solidifying and cooling module, and collecting state data of the low-temperature protection layer 14 through a sampling module 9;
S5, acquiring the state data obtained by sampling by the sampling module 9 through a quality evaluation module, and evaluating the formed low-temperature protection layer 14 to form an evaluation result;
S6, acquiring the evaluation result and a set qualified threshold range through a regulation and control module, and dynamically adjusting extrusion parameters of the extrusion module 6 if a trigger condition is met;
s7, extruding and wrapping an insulating material through the insulating protection module 10 to form an outer protective layer 49 outside the low-temperature protective layer 14;
In this embodiment, there is also provided a production system of a low temperature resistant cable, the production system including a server, a central processing unit, a raw material processing module, a pulling module, an extrusion module 6, a bubble module 31, a solidification cooling module, a sampling module 9, a quality evaluation module, a regulation module, an insulation protection module 10, and a cooling module 11, the server being respectively connected with the raw material processing module, the pulling module, the extrusion module 6, the bubble module 31, the solidification cooling module, the sampling module 9, the quality evaluation module, the regulation module, the insulation protection module 10, and the cooling module 11 and storing intermediate data and process data of the raw material processing module, the pulling module, the extrusion module 6, the bubble module 31, the solidification cooling module, the sampling module 9, the quality evaluation module, the regulation module, the insulation protection module 10, and the cooling module 11 in a database of the server for inquiry or call;
The central processing unit is respectively in control connection with the raw material processing module, the traction module, the extrusion module 6, the bubble module 31, the solidification cooling module, the sampling module 9, the quality evaluation module, the regulation and control module, the insulation protection module 10 and the cooling module 11, and is used for carrying out centralized control on the raw material processing module, the traction module, the extrusion module 6, the bubble module 31, the solidification cooling module, the sampling module 9, the quality evaluation module, the regulation and control module, the insulation protection module 10 and the cooling module 11 based on the central processing unit, and transmitting control data to a database of the server for storage so as to improve the efficiency and the reliability of the whole system on cable generation;
the raw material processing module is used for preprocessing raw materials and supplying the raw materials to the extrusion module 6, the extrusion module 6 is used for extruding the raw materials processed by the raw material processing module and wrapping the raw materials outside the conductor 1 to form a low-temperature protective layer 14,
The bubble module 31 is configured to apply a pressurized gas to the low-temperature protection layer 14 so as to form tiny bubbles in the low-temperature protection layer 14, the solidification and cooling module solidifies and cools the formed low-temperature protection layer 14, the sampling module 9 samples the low-temperature protection layer 14 to obtain state data of the low-temperature protection layer 14, the quality evaluation module evaluates the low-temperature protection layer 14 according to the state data to form an evaluation result, the regulation module obtains the evaluation result and a set acceptable threshold range, if a trigger condition is met, the extrusion parameter of the extrusion module 6 is dynamically adjusted, the insulation protection module 10 extrudes and wraps an insulation material outside the low-temperature protection layer 14, and the cooling module 11 is configured to cool the outer protection layer 49;
optionally, the production method of the low-temperature-resistant cable further comprises the steps of adding a low-temperature plasticizer DOA or a flexible epoxy compound in the raw material treatment process;
in this example, the raw materials include, but are not limited to, polyethylene (PE), polyvinyl chloride (PVC), cross-linked polyethylene (XLPE), high Density Polyethylene (HDPE);
The feedstock is configured to be processed in the feedstock processing module;
The raw material processing module comprises a stirring unit, a heating unit and a supply unit, wherein the heating unit heats the raw materials, the stirring unit stirs the heated raw materials so as to make the raw materials in a molten state more uniform, and the supply unit supplies the stirred raw materials in the molten state to the extrusion module 6;
The stirring unit comprises a stirring cavity, a stirring rod 33, a supporting seat and a stirring driving mechanism 34, wherein the stirring cavity is used for placing raw materials, the stirring cavity is provided with a feeding port, one end of the stirring rod 33 is in driving connection with the stirring driving mechanism 34 to form a stirring part, the other end of the stirring rod 33 extends out towards the stirring cavity, the supporting seat is arranged on the inner wall of the feeding port of the stirring cavity, and the stirring part is arranged on the supporting seat to stir the raw materials fed through the feeding port;
As shown in fig. 9, the feeding ports are arranged at two sides of the supporting seat, so that the raw materials can easily enter the stirring cavity;
The supply unit comprises a supply cavity 32, a supply screw 36 and a supply driving mechanism 37, wherein the supply screw 36 is arranged in the supply cavity 32 and supplies raw materials entering the supply cavity 32, one end of the supply screw 36 is in driving connection with the supply driving mechanism 37 to form a supply part, and the other end of the supply screw 36 extends into the supply cavity 32 and supplies the raw materials in a molten state in the supply cavity 32, so that the raw materials can be supplied from the stirring cavity to the extrusion module 6;
wherein, as shown in fig. 9, the supply part is arranged outside the supply cavity 32;
the heating unit is provided in the inner walls of the stirring and supply chambers 32 and heats the raw materials charged into the stirring chamber and the raw materials supplied in the supply chamber 32;
The heating unit comprises a heating element 35 and a current controller, wherein the heating element 35 is spirally arranged along the inner walls of the stirring cavity and the supply cavity 32, the heating element 35 is electrically connected with the current controller, and the current controller controls the heating temperature of the heating element 35 so that the heating element 35 can heat and promote the raw materials to be in a molten state;
the raw materials are processed through the raw material processing module, so that the preparation process of the low-temperature protection layer 14 of the cable is more efficient, and the whole cable production is guaranteed to have the advantages of high reliability and high stability in the preparation process;
The extrusion module 6 comprises an extrusion screw 30, an extrusion cavity 27, an extrusion die 29 and an extrusion driving mechanism 28, wherein one end of the extrusion screw 30 is in driving connection with the extrusion driving mechanism 28 to form an extrusion part, the other end of the extrusion screw 30 stretches into the extrusion cavity 27 and extrudes raw materials in the extrusion cavity 27, and the extrusion die 29 is arranged at an extrusion opening of the extrusion cavity 27 and shapes the extruded low-temperature protection layer 14;
wherein the extrusion module 6 further comprises a die placement cavity which is arranged at an extrusion port of the extrusion cavity 27 and is used for placing the extrusion die 29;
In addition, the extrusion die 29 is detachably connected to the die placement cavity;
The bubble module 31 comprises a liquid supply channel, a liquid supply tank 51, a booster pump 53 and an electronic on-off valve 52, wherein the liquid supply tank 51 stores the chemical or physical foaming agent, one end of the liquid supply channel is connected with the booster pump 53 to form a supply part, the supply part is arranged in the liquid supply tank 51, and the other end of the liquid supply channel extends out of the extrusion cavity 27 so as to enable bubbles to be generated in raw materials and be extruded and wrapped on the periphery of the conductor 1;
The electronic on-off valve 52 is used for controlling the on-off of the liquid supply channel, so as to control the liquid supply time of the liquid supply channel;
The bubble module 31 injects chemical or physical foaming agent into the raw materials of the extrusion process of the extrusion module 6, wherein the chemical or physical foaming agent comprises;
wherein the chemical foaming agent decomposes during heating to produce a gas, such as azodicarbonamide (ADCA);
The physical foaming agent is gas such as carbon dioxide or nitrogen injected under high pressure;
In this embodiment, a chemical foaming agent is preferably used;
Through the mutual matching of the extrusion module 6 and the bubble module 31, the low-temperature protection layer 14 forms a bubble structure, the low-temperature resistance of the cable is improved, and the whole cable production process is guaranteed to have the advantages of high low-temperature resistance, high manufacturing process accuracy, good cable protection effect and high cable toughness;
The solidification and cooling module is arranged after the extrusion process of the extrusion module 6 and is used for cooling the extruded low-temperature protection layer 14;
The solidifying and cooling module comprises a solidifying unit and a cooling unit, wherein the solidifying unit solidifies and crosslinks the low-temperature protection layer 14, and the cooling unit cools the low-temperature protection layer 14 so as to maintain the stability and uniformity of a foam structure;
the curing unit comprises a curing cavity 7, a curing lamp 15 and an intensity adjuster, wherein the curing cavity 7 is used for allowing a conductor 1 wrapped with the low-temperature protective layer 14 to pass through, the curing lamp 15 is used for curing the low-temperature protective layer 14, and the intensity adjuster is used for adjusting the intensity of the curing lamp 15;
The curing cavity 7 is a hollow passing cavity, the passing cavity is used for passing the conductor 1 wrapped with the low-temperature protective layer 14, and meanwhile, the curing lamp 15 is arranged on the inner wall of the passing cavity;
in addition, the curing lamp 15 is electrically connected to the strength adjuster so that the conductor 1 wrapped with the low-temperature protective layer 14 can be crosslinked and cured to form a stable structure;
Meanwhile, the curing temperature of the curing lamp 15 needs to be adjusted in combination with the historical data, and is set and adjusted by the intensity adjuster, so that the stability and reliability of the low-temperature protection layer 14 are improved;
in this embodiment, after the curing or crosslinking operation, the conductor 1 wrapped with the low-temperature protection layer 14 is cooled by the cooling unit;
The cooling unit comprises a cooling pipeline 17, a cooling pump, a water storage tank 8 and at least two atomizing spray heads 16, wherein the water storage tank 8 is used for storing cooling water, one end of the cooling pipeline 17 is connected with the at least two atomizing spray heads 16, the other end of the cooling pipeline 17 is connected with the cooling pump to form a cooling part, the cooling part is arranged in the water storage tank 8, and water in the water storage tank 8 is sprayed on the low-temperature protective layer 14 through the cooling pipeline 17 and the at least two atomizing spray heads 16 so as to realize cooling;
Meanwhile, at least two atomizing nozzles 16 are symmetrically arranged on the inner wall of the passing cavity and generate atomized cooling mist curtains, so that the passing low-temperature protective layer 14 can be rapidly cooled;
Through the mutual matching of the solidifying unit and the cooling unit, the low-temperature protective layer 14 can be solidified and crosslinked, the strength of the low-temperature protective layer 14 is improved, and the stability and the reliability of the foam structure of the low-temperature protective layer 14 are maintained;
alternatively, in step S2, gas is injected into the formed low-temperature protective layer 14 through the bubble module 31 while the raw material is extruded by the extrusion module 6, so that fine bubbles are formed in the low-temperature protective layer 14;
optionally, the production method of the low-temperature-resistant cable further comprises the steps that the sampling module collects the state data of at least two angles of the periphery side of the low-temperature protection layer 14 in the process of sampling the low-temperature protection layer 14;
Optionally, in step S2, during the extrusion of the extrusion module 6, the conductor 1 is pulled by a pulling module, so that the conductor 1 is wrapped around the low-temperature protection layer 14;
wherein the drawing speed of the drawing module is matched with the extrusion speed of the extrusion module 6;
In this embodiment, as shown in fig. 4, the pulling module is disposed at one side of the extrusion module 6 and the cooling module 11, that is, the conductor 1 is pulled, and the conductor 1 wrapped with the outer protective layer 49 after cooling the cooling module 11 is pulled;
The pulling module comprises a pulling unit and a pulling evaluation unit, wherein the pulling unit is used for synchronously pulling the conductor 1 and the conductor 1 wrapped with the outer protective layer 49, and the pulling evaluation unit evaluates the pulling speed of the pulling air bag so as to synchronously pull the pulling air bag conductor 1 and the conductor 1 wrapped with the outer protective layer 49;
The traction unit comprises a clamping air bag 5, an inflator pump, an electronic pressure release valve 4, a connecting seat 3, a traction track 2, a traction driving mechanism and a supporting seat, wherein the supporting seat supports the traction track 2, the connecting seat 3 is in sliding connection with the traction track 2, the traction driving mechanism is arranged on the connecting seat 3 and drives the connecting seat 3 to slide along the direction of the traction track 2, the inflator pump inflates the clamping air bag 5 to enable the clamping air bag 5 to inflate and expand so as to clamp the conductor 1 and the conductor 1 wrapped with an outer protective layer 49, the electronic pressure release valve 4 is arranged on the clamping air bag 5 and discharges gas in the clamping air bag 5, and the clamping air bag 5 is arranged on the connecting seat 3 and moves along with the movement of the connecting seat 3;
The clamping air bag 5 is annular, and after being inflated, the conductor 1 and the conductor 1 wrapped with the outer protective layer 49 are clamped;
The pulling process of the pulling module comprises the following steps:
The connection seat 3 is at the initial end of the traction track 2, the central processing unit controls the inflator pump to inflate the clamping airbag 5 so that the clamping airbag 5 inflates and expands to clamp the conductor 1 and the conductor 1 wrapped with the outer protective layer 49, at this time, the central processing unit controls the connection seat 3 to slide along the length direction of the traction track 2, so that the connection seat 3 and the clamping airbag 5 on the connection seat 3 synchronously move forwards, so that the clamping airbag and the end of the traction track 2 to which the connection seat 3 moves (the length of traction is equivalent to the length of the traction track 2);
When the connection seat 3 reaches the tail end of the traction track 2, the central processing unit controls the electronic pressure release valve 4 to discharge the gas in the clamping air bag 5 so as to release the clamping state of the clamping air bag 5 on the conductor 1 and the conductor 1 wrapped with the outer protective layer 49, and controls the traction driving mechanism to drive the connection seat 3 to return to the initial end from the tail end of the traction track 2, and repeats the process, so that the reciprocating traction on the conductor 1 and the conductor 1 wrapped with the outer protective layer 49 is realized;
the traction evaluation unit obtains the extrusion speed of the extrusion molding module, and determines the traction speed V PULL of the traction unit according to the following formula:
VPULL＝Vextrusion·(1+μ);
Wherein μ is an adjustment coefficient, the value of which is determined according to historical operation data, V extrusion is an actual extrusion speed parameter (m/s ) of the extrusion molding module for the outer protective layer, and the value of which is determined according to the following formula:
Vextrusion＝n·τ·(1-kF·F);
Wherein N is the target rotational speed of the extrusion screw for the outer protective layer in units of revolutions per second (1/s), which is a known rotational speed preset by the staff according to the extrusion material, τ is a conversion factor, i.e. the screw rotational speed is measured without resistance influence (i.e. the screw idle rotational speed) by experimental determination, the actual extrusion speed is measured in an ideal working environment, the linear speed generated by the rotation of each revolution of the screw is determined in units of meters per revolution (m/revolution), F is the resistance of the screw (i.e. the resistance F of the screw is related to the properties of the extrusion material itself, which can be obtained by a pressure sensor on the screw, (1/N, 1/newton)), k F is an adjustment factor, the actual extrusion speed of the screw is measured at different resistances by experimental determination, and the fitting data is determined;
In this embodiment, the conversion coefficient τ and the adjustment factor k F are determined according to the following steps:
1) Conversion coefficient τ:
The experiment measurement is that the screw rotation speed n 'is measured under the condition of no resistance influence, the actual extrusion speed V extrusion is measured by using the material similar to the outer protective layer in the ideal working environment (namely, the actual extrusion speed generated when the material similar to the outer protective layer is extruded by taking the rotation speed n' as a command in the ideal working environment), and τ is determined:
2) Adjustment factor k F:
Experimental determination k F was determined by linear regression fit of the data based on the resistance produced by the different materials, measuring the actual extrusion speed V extrusion (i.e., the actual extrusion speed produced when extruding the different materials with the rotational speed n' as the command under ideal operating conditions):
In this embodiment, the mutual cooperation of the pulling module and the extrusion module 6 makes the production process of the cable more efficient, and ensures that the whole system has the advantages of high intelligent degree, strong low temperature resistance of the cable, high pulling stability and good synchronous pulling reliability;
The sampling module 9 comprises a steering unit and a sampling unit, the sampling unit is used for collecting state data of the low-temperature protection layer 14, and the steering unit is used for adjusting the collection angle of the sampling unit so that the sampling unit can collect performance data of a plurality of angles of the low-temperature protection layer 14;
The sampling unit comprises an ultrasonic transmitter 25, an ultrasonic collector 26, a beta temperature sensor 43A and a data storage, wherein the ultrasonic transmitter 25 transmits ultrasonic waves to the low-temperature protective layer 14, the ultrasonic collector 26 collects ultrasonic wave data reflected by the low-temperature protective layer 14, the beta temperature sensor 43A collects temperature data of the low-temperature protective layer 14, and the data storage stores ultrasonic wave transmission intensity of the ultrasonic transmitter 25, ultrasonic wave intensity obtained by ultrasonic wave collection and temperature data obtained by the beta temperature sensor 43A;
The steering unit comprises a detection base 20, a detection seat 24, a steering gear 23, a steering driving mechanism 18, an identification probe 19 and at least two positioning marks 13, wherein the detection base 20 is provided with a detection hole for the conductor 1 to pass through, the sampling unit is arranged on the detection seat 24, the steering gear 23 is nested on the detection seat 24, the steering gear 23 is arranged on the inner wall of the detection cavity and meshed with the steering gear 23, the at least two positioning marks 13 are arranged on the detection seat 24 and distributed at equal intervals along the circumferential direction of the outer wall of the detection seat 24, and the identification probe 19 is arranged on the inner wall of the detection hole and is arranged relative to the positioning marks 13;
A sliding rail 22 is arranged on the cavity wall of the detection base 20, and the sliding rail 22 and the detection hole are coaxially arranged;
The steering unit further comprises at least two limiting rods 21, wherein the limiting rods 21 are U-shaped, one ends of the limiting rods 21 are connected with the connecting seat 3, the other ends of the limiting rods 21 are in sliding connection with the sliding rails 22, and when the steering driving mechanism 18 drives the detection seat 24, the detection seat 24 can be limited, so that the sampling unit can acquire performance data of the low-temperature protection layer 14;
Optionally, the production method of the low-temperature-resistant cable further comprises the step S5, wherein the state data comprise temperature T, attenuation coefficient A of sound waves in the low-temperature protective layer 14, density D and elastic modulus E of the low-temperature protective layer 14;
in the present embodiment, the temperature T is directly measured by the β temperature sensor 43A, and the attenuation coefficient a in the low temperature protective layer 14 is calculated by the following formula:
Wherein P 0 is the power before the material is attenuated, the value of which is determined by an ultrasonic transmitter, P is the power after the material is attenuated, the value of which is acquired by the ultrasonic acquisition device, d is the distance of the sound wave propagating in the material, and the distance unit is preferably Centimeter (CM), namely the fixed distance of the extruded low-temperature protective layer (shown in figure 12);
the density D (unit: kg/m 3) of the low-temperature protective layer was calculated according to the following formula:
Wherein Z is the acoustic impedance of the low temperature protective layer in units of Pa.s/m or kg/(m 2 s), which is measured directly by experimental means (corresponding to a known value), v is the propagation velocity of the ultrasonic wave in the low temperature protective layer in units of m/s, which is based on:
wherein d is the distance of sound wave propagation in the material, the unit is meter, t is the propagation time of sound wave, and the unit is second, namely the time from the sound wave emission of the ultrasonic generator to the ultrasonic wave reception of the ultrasonic collector;
The elastic modulus E is calculated according to the following formula:
E=D·v2;
Wherein D is the density of the low-temperature protective layer, and v is the propagation speed of the ultrasonic wave in the low-temperature protective layer, and the unit is meter per second (m/s);
Optionally, in step S5, the quality evaluation module obtains the State data acquired by the sampling module, and calculates a State index State of the low-temperature protection layer according to the following formula:
wherein T is the temperature of the low-temperature protective layer, the unit is the temperature (degree centigrade), A is the attenuation coefficient of sound waves in the low-temperature protective layer, decibels per centimeter (dB/cm), D is the density of the low-temperature protective layer, the unit is kg/m 3, and E is the elastic modulus of the low-temperature protective layer, and the unit is Pascal (Pa);
optionally, the production method of the low temperature resistant cable further comprises the following steps that in step 6, the triggering condition is set as follows:
The State index State exceeds a set qualification threshold range;
The set qualification threshold Range (taking Range1 and Range2 as examples) is set by a manager or a system according to the actual situation of the low-temperature protection layer, which is a technical means well known to those skilled in the art, and those skilled in the art can query related technical manuals to obtain the technology, so that the description is omitted in this embodiment;
Specifically, if the State index State of the low-temperature protection layer is not in the Range of [ Range1, range2], which indicates that the State of the low-temperature protection layer does not meet the system requirement, triggering the adjustment module to adjust the extrusion parameters of the extrusion module;
If the State index State of the low-temperature protection layer is in the Range of [ Range1, range2], the State of the low-temperature protection layer is proved to be in accordance with the system requirement, and the current extrusion parameters of the extrusion module and the foaming parameters of the bubble module are maintained;
The regulation and control module comprises an extrusion parameter adjustment unit and an extrusion analysis unit, wherein the extrusion analysis unit is used for analyzing the extrusion parameters of the extrusion module to form extrusion analysis results, the extrusion parameter adjusting unit triggers the adjustment of the extrusion parameters of the extrusion module according to the extrusion analysis result of the extrusion analysis unit;
The extrusion analysis unit acquires the State index State and a set qualification threshold range, and calculates extrusion parameters according to the following formula:
Wherein, T new is a newly adjusted temperature adjustment value, P new is a newly adjusted pressure adjustment value, T is an original temperature value, P is an original pressure value, alpha T is a temperature adjustment scale factor, the value is set according to specific practical conditions, alpha P is a pressure adjustment scale factor, the value is set according to specific practical conditions, if State < Range1, a "+" sign is taken, if State > Range2, a "-" sign is taken, state is a State index of the low temperature protective layer, and Target is a center point of a set qualification threshold value, the value of which is determined according to the following formula (namely, the set qualification threshold value ranges [ Range1, range2] take Range1, range2 as an example):
Wherein Range1 is the lower limit of the set qualification threshold Range, range2 is the upper limit of the set qualification threshold Range, and Range2> Range1;
The value ranges of the temperature adjustment scale factor alpha T and the pressure adjustment scale factor alpha P are respectively as follows:
αT∈[0.1,1.0];
αP∈[0.1,5.0];
In the present embodiment, an example of determining the temperature adjustment scaling factor α T and the pressure adjustment scaling factor α P is provided, in particular:
(1) The raw materials adopt a scene of crosslinked polyethylene (XLPE), and then:
temperature adjustment scaling factor α T =0.8;
pressure adjustment scaling factor α P =2.0;
(2) The raw materials adopt a PVC scene, and then:
Temperature adjustment scaling factor α T =0.5;
Pressure adjustment scaling factor α P =1.0;
(3) The raw materials adopt a scene of High Density Polyethylene (HDPE), and then:
temperature adjustment scaling factor α T =0.6;
pressure adjustment scaling factor α P =1.5;
for any of the above scenarios, the adjusting step includes:
S11, performing control experiments in an actual production environment, and collecting influence data of temperature and pressure on state indexes;
S12, optimizing and adjusting, namely optimizing a temperature adjustment scale factor and a pressure adjustment scale factor by using a statistical method based on the collected data;
S13, implementing and monitoring, namely applying the optimized temperature adjustment scale factor and pressure adjustment scale factor to production, continuously monitoring the effect of the production, and performing fine adjustment according to the requirement;
in summary, the setting and optimization process of the temperature adjustment scale factor and the pressure adjustment scale factor will ensure the quality and consistency of the cable production, meeting the requirements of specific applications;
the extrusion parameter adjusting unit acquires new extrusion parameters (extrusion analysis results) calculated by the extrusion analysis unit, transmits the extrusion parameters to the central controller, and triggers the central controller to control the extrusion module 6 so as to improve the control precision and reliability of the low-temperature protection layer 14;
Optionally, in step S6, the insulating material used by the insulating protection module 10 includes at least one of Polyethylene (PE), cross-linked polyethylene (XLPE), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), polyetheretherketone (PEEK) or Polyimide (PI);
The insulation protection module 10 comprises a heating unit, an extrusion molding unit and a transmission unit, wherein the heating unit heats insulation materials, the transmission unit transmits the insulation materials heated by the heating unit into the extrusion molding unit, and the extrusion molding unit extrudes and wraps the insulation materials in a molten state on the periphery of the low-temperature protection layer 14 to form an outer protection layer;
The temperature raising unit comprises a heating cavity 42, a temperature raising member 41, a temperature raising controller and a gamma temperature sensor 43B, wherein the heating cavity 42 is used for placing the insulating material, the gamma temperature sensor 43B is used for collecting the temperature in the heating cavity 42, the temperature raising member 41 is used for heating the insulating material in the heating cavity 42 so that the insulating material can be changed into a molten state, and the temperature raising controller is used for controlling the temperature raising temperature of the temperature raising member 41 based on the gamma temperature sensor 43B;
The conveying unit comprises a conveying cavity 46, a conveying screw 45 and a conveying driving mechanism 44, wherein the conveying cavity 46 is connected with the heating cavity 42 and the extrusion molding unit, so that insulating materials in a molten state can be processed and conveyed smoothly, one end of the conveying screw 45 is in driving connection with the conveying driving mechanism 44 to form a conveying part, and the other end of the conveying screw 45 penetrates through the conveying cavity 46 and stretches out of the conveying cavity 46;
in addition, the transfer chamber 46 is configured as a sealed chamber structure;
wherein the temperature raising member 41 is circumferentially provided on the inner walls of the heating chamber 42 and the transferring chamber 46 so that the insulating material in a molten state processed and transferred through the heating chamber 42 and the transferring chamber 46 can be smoothly processed and supplied;
The extrusion unit comprises an extrusion cavity 38, an extrusion screw and an extrusion driving mechanism 39, wherein the extrusion cavity 38 is used for placing the extrusion screw, the extrusion cavity 38 is used for placing the insulating material in a molten state, the extrusion cavity 38 is provided with an extrusion port, the extrusion screw 30 is arranged in the extrusion cavity 38 and extrudes the insulating material in the molten state from the extrusion port of the extrusion cavity 38, one end of the extrusion screw is in driving connection with the extrusion driving mechanism 39, and the extrusion part is arranged outside the extrusion cavity 38, so that the other end of the extrusion screw penetrates through the extrusion cavity 38 and stretches into the extrusion cavity 38 and extrudes the insulating material in the molten state from the extrusion port of the extrusion cavity 38;
the extrusion unit further comprises a die placing groove and an extrusion die 40, wherein the die placing groove is used for placing the extrusion die 40, the extrusion placing groove is arranged at the extrusion port, and the extrusion die 40 is used for repairing the extruded outer protective layer 49 so that the insulating material in a molten state is uniformly wrapped on the periphery of the low-temperature protective layer 14;
wherein the extrusion die 40 is detachably connected with the die placement groove;
Meanwhile, for the manufacture of cables with different diameters, an adaptive extrusion molding die 40 is selected, which is a technical means well known to those skilled in the art, and those skilled in the art can inquire about related technical manuals to know the technology, so that the description is omitted in this embodiment;
Optionally, the production method of the low-temperature-resistant cable further comprises the steps of cooling the outer protective layer 49 through the cooling module 11 after the outer protective layer is obtained;
The cooling module 11 comprises a cooling cavity 47, a cooling pipe 50, a cooling water tank 12 and at least two cooling nozzles 48, wherein the cooling cavity 47 is provided with a hollow sliding channel, the cooling water tank 12 stores cooling water, the cooling nozzles 48 spray cooling water so as to cool an extruded outer protective layer 49, and the cooling pipe 50 is connected with the cooling water tank 12 and the cooling nozzles 48;
Wherein the cooling nozzle 48 is disposed on the inner wall of the cooling chamber 47 and is disposed towards the outer protective layer 49;
meanwhile, the cooling module 11 adopts a water cooling mode to enable the extruded outer protective layer 49 to be cooled rapidly;
The units involved in this example are examples, and the art may set different appropriate units according to its own needs when implementing this embodiment.
In this embodiment, through the mutual cooperation of the insulation protection module 10 and the cooling module 11, the manufacturing precision of the outermost protection layer 49 is higher, and the whole system is ensured to have the advantages of good protection effect, accurate quality control, good cable toughness and high intelligent degree.
The second embodiment is to be understood as including all the features of any one of the foregoing embodiments and further improving the features on the basis of the features, and the regulating module further includes a foam analysis unit and a foam parameter adjustment unit, where the foam analysis unit is used for analyzing a foam parameter of the foam module to form a foam analysis result, and the foam parameter adjustment unit triggers adjustment of the foam parameter of the foam module according to the foam analysis result of the foam analysis unit, where the foam parameter adjustment unit is shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11, fig. 12, fig. 13, fig. 14, fig. 15 and fig. 16;
The set qualification threshold Range (taking Range1 and Range2 as examples) is set by a manager or a system according to the actual situation of the low-temperature protection layer, which is a technical means well known to those skilled in the art, and those skilled in the art can query related technical manuals to obtain the technology, so that the description is omitted in this embodiment;
Specifically, if the State index State of the low-temperature protection layer is not in the Range of [ Range1, range2], which indicates that the State of the low-temperature protection layer does not meet the system requirement, triggering the adjusting module to adjust the foaming parameters of the bubble module;
If the State index State of the low-temperature protection layer is in the Range of [ Range1, range2], the State of the low-temperature protection layer is proved to be in accordance with the system requirement, and the foaming parameters of the current bubble module are maintained;
the foaming analysis unit acquires the State index State and a set qualification threshold range, and calculates foaming parameters according to the following formula:
Wherein R f,new is a newly adjusted foaming ratio value, namely, the ratio of the foaming agent to the volume of the low-temperature protective layer, R f is an original foaming agent ratio value, alpha R is a foaming agent ratio adjustment scaling factor, the value is set according to specific practical conditions, range1 is the lower limit of a set qualified threshold Range, range2 is the upper limit of the set qualified threshold Range, range2> Range1, (Range 2 and Range1 are not 0), if State < Range1, a "+" sign is taken, if State > Range2, a "-" sign is taken;
In the example, the value range of the proportion factor alpha R for the proportion adjustment of the foaming agent is 0.01% -0.1% of the difference of per unit state indexes;
In this embodiment, an example of a scaling factor α R for determining the blowing agent scaling is provided, specifically:
(1) The raw materials adopt a scene of crosslinked polyethylene (XLPE), and then:
The scaling factor α R =0.04% of the blowing agent scaling;
(2) The raw materials adopt a PVC scene, and then:
the scaling factor α R =0.02% of the blowing agent scaling;
(3) The raw materials adopt a scene of High Density Polyethylene (HDPE), and then:
the scaling factor α R =0.03% of the blowing agent scaling;
in summary, for any of the above scenarios, the adjusting step includes:
S21, performing control experiments in an actual production environment and collecting influence data of the foaming agent proportion on the state index;
S22, optimizing and adjusting, namely optimizing the foaming agent proportion factor by using a statistical method based on the collected data;
s23, implementing and monitoring, namely applying the optimized foaming agent scale factor to production, continuously monitoring the effect of the foaming agent scale factor, and performing fine adjustment according to the requirement;
in summary, the setting and optimizing process of the foaming agent proportion factors ensures the quality and consistency of the cable production and meets the requirements of specific applications;
The foaming parameter adjusting unit acquires new foaming parameters (foaming analysis results) obtained by calculation of the foaming analysis unit, transmits the foaming parameters to the central controller, and triggers the central controller to control the foaming module so as to improve the control precision and reliability of the low-temperature protective layer;
Through the cooperation of foaming analysis unit and foaming parameter adjustment unit, make the low temperature protective layer can form the gas pocket, promotes the low temperature protection level of cable, guarantees that whole cable has that the low temperature resistance is strong, the protection effect is good, the good advantage of reliability.
The foregoing disclosure is only a preferred embodiment of the present invention and is not intended to limit the scope of the invention, so that all equivalent technical changes made by applying the description of the present invention and the accompanying drawings are included in the scope of the present invention, and in addition, elements in the present invention can be updated as the technology develops.
Claims (5)
1. The production method of the low-temperature-resistant cable is characterized by comprising the following steps of:
S1, a raw material treatment module is used for treating raw materials and supplying the treated raw materials to an extrusion module;
S2, extruding the raw materials through the extrusion module and wrapping the raw materials on the periphery of the conductor to form a low-temperature protective layer;
S3, injecting chemical or physical foaming agents into the raw materials in the extrusion process of the extrusion module through a bubble module so as to form micro bubbles in the low-temperature protective layer;
s4, solidifying and cooling the low-temperature protection layer through a solidifying and cooling module, and collecting state data of the low-temperature protection layer through a sampling module;
S5, acquiring the state data obtained by sampling by the sampling module through a quality evaluation module, and evaluating the formed low-temperature protection layer to form an evaluation result;
s6, acquiring the evaluation result and a set qualified threshold range through a regulation and control module, and dynamically adjusting extrusion parameters of the extrusion module if a trigger condition is met;
s7, extruding an insulating material through an insulating protection module and wrapping the insulating material outside the low-temperature protection layer to form an outer protection layer;
the production method of the low-temperature-resistant cable further comprises the steps that the sampling module collects the state data of at least two angles of the periphery side of the low-temperature protection layer in the process of sampling the low-temperature protection layer;
during the extrusion process of the extrusion module, a conductor is pulled through a pulling module, so that the conductor is wrapped with the low-temperature protective layer, wherein the pulling speed of the pulling module is matched with the extrusion speed of the extrusion module;
in the step S5, the state data comprise temperature T, attenuation coefficient A of sound waves in the low-temperature protective layer, density D and elastic modulus E of the low-temperature protective layer;
In step S5, the quality evaluation module obtains the State data acquired by the sampling module, and calculates a State index State of the low-temperature protection layer according to the following formula:
;
Wherein T is the temperature of the low-temperature protective layer, A is the attenuation coefficient of sound waves in the low-temperature protective layer, D is the density of the low-temperature protective layer, and E is the elastic modulus of the low-temperature protective layer;
The temperature T is directly measured by a beta temperature sensor, and the attenuation coefficient A in the low-temperature protective layer is calculated by the following formula:
;
Wherein P 0 is the power before the attenuation of the material, the value of the power is determined by an ultrasonic transmitter, P is the power after the attenuation of the material, the value of the power is acquired by the ultrasonic acquisition device, d is the distance of the sound wave propagating in the material, and the distance unit is cm, namely the fixed distance of the extruded low-temperature protective layer;
The density D of the low-temperature protective layer is calculated according to the following formula in kg/m 3,:
;
wherein Z is acoustic impedance of the low-temperature protective layer, in Pa sec per meter, pa.s/m, or kg/(m 2 s), the value of which is directly measured by experimental means, v is propagation speed of the ultrasonic wave in the low-temperature protective layer, in m sec, and the value of which is calculated according to the following formula:
;
wherein d is the distance of sound wave propagation in the material, the unit is meter, t is the propagation time of sound wave, and the unit is second, namely the time from the sound wave emission of the ultrasonic generator to the ultrasonic wave reception of the ultrasonic collector;
The elastic modulus E is calculated according to the following formula:
;
Wherein D is the density of the low-temperature protective layer, the unit is kg/m 3, and v is the propagation speed of the ultrasonic wave in the low-temperature protective layer, and the unit is meters per second.
2. The method for producing a low temperature resistant cable according to claim 1, further comprising, in step 6, the triggering condition is set as:
The State index State exceeds a set qualification threshold range.
3. The method for producing a low temperature resistant cable according to claim 2, further comprising adding a low temperature plasticizer DOA or a flexible epoxy compound during the treatment of the raw material.
4. A method of producing a low temperature resistant cable according to claim 3, wherein in step S7, the insulating material used for the insulating protection module comprises at least one of polyethylene, cross-linked polyethylene, polyvinyl chloride, polyvinylidene fluoride, polyetheretherketone or polyimide.
5. The method for producing a low-temperature-resistant cable according to claim 4, further comprising cooling the outer protective layer by a cooling module after the outer protective layer is obtained.
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| CN114758842B (en) * | 2022-05-25 | 2022-11-15 | 广州南洋电缆集团有限公司 | High-voltage cable that lightweight is able to bear or endure to transship new energy automobile and production facility thereof |
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| CN117877793A (en) * | 2024-02-28 | 2024-04-12 | 广东新亚光电缆股份有限公司 | Environment-friendly PP insulating low-voltage cable |
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