CN115440445A - Anti-sinking extrusion molding process for medium-voltage crosslinked cable - Google Patents
Anti-sinking extrusion molding process for medium-voltage crosslinked cable Download PDFInfo
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- CN115440445A CN115440445A CN202211183142.7A CN202211183142A CN115440445A CN 115440445 A CN115440445 A CN 115440445A CN 202211183142 A CN202211183142 A CN 202211183142A CN 115440445 A CN115440445 A CN 115440445A
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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
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers
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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
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/143—Insulating conductors or cables by extrusion with a special opening of the extrusion head
- H01B13/144—Heads for simultaneous extrusion on two or more conductors
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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
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/145—Pretreatment or after-treatment
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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
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/146—Controlling the extrusion apparatus dependent on the capacitance or the thickness of the insulating material
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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
- H01B13/228—After-treatment
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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
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of cable production, in particular to a medium-voltage crosslinked cable dent-prevention extrusion molding process, which comprises the steps of S1, preheating, and placing a conductor in the center of an extrusion molding device after the conductor reaches the preheating standard; s2, feeding, wherein a central control unit in the control analyzer controls intelligent valves in the extrusion molding device to be opened simultaneously so that the first feed liquid, the second feed liquid and the third feed liquid flow into corresponding feed liquid pipelines; s3, performing three-layer co-extrusion, wherein the extrusion molding device performs three-layer co-extrusion on the conductor so as to respectively form a conductor shielding layer, an insulating layer and an insulating shielding layer from near to far on the surface of the conductor; s4, vulcanizing, namely conveying the insulated wire core subjected to the three-layer co-extrusion to a vulcanizing pipe filled with nitrogen for vulcanizing; s5, performing online detection, wherein a central control unit judges whether to adjust the operation parameters of the extrusion molding device according to data obtained by the online detection; the extrusion molding thickness uniformity of the medium-voltage crosslinked cable is improved, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of cable production, in particular to a medium-voltage crosslinked cable anti-sinking extrusion molding process.
Background
The medium-voltage crosslinked cable is widely applied to important departments such as superstores, subways, power plants, docks, tunnels and the like and public places. When the medium-voltage cross-linked cable is punctured due to the sunken conductor shielding, traffic paralysis, production stoppage and other serious losses are caused by sudden power failure, and the living order of people is seriously influenced. At present, a three-layer co-extrusion type technology is adopted for preparing the medium-voltage crosslinked cable, the pressure of an extruded melt is higher in the three-layer co-extrusion type technology, the shielding of an insulated wire core is trapped in the insulated wire core when the machine head is subjected to extrusion molding, and the product quality of the medium-voltage crosslinked cable is seriously influenced.
Chinese patent publication No. CN105119061a discloses a cable crimping sleeve for a three-layer co-extrusion cable and a three-layer co-extrusion cable crimping process, the cable crimping sleeve for a three-layer co-extrusion cable comprises a crimping circular tube made of steel, a partition part is arranged in the middle of the crimping circular tube, a first crimping cavity and a second crimping cavity are respectively formed in regions surrounded by two ends of the partition part and an inner tube wall of the crimping circular tube, and the lengths of the first crimping cavity and the second crimping cavity are the same. The invention also discloses a three-layer co-extrusion cable crimping process, which comprises the following steps: two cables needing crimping are crimped by the cable crimping sleeve for the three-layer co-extrusion cable in the technical scheme, and 30 meters of head and tail lines are reserved at two ends of the connector respectively. The cable crimping sleeve for the three-layer co-extrusion cable can conveniently and quickly complete cable crimping and improve the cable crimping quality. Therefore, the cable crimping sleeve for the three-layer co-extrusion cable and the three-layer co-extrusion cable crimping process have the following problems: the melt pressure at the machine head is high, so that the shielding layer of the medium-voltage crosslinked cable is easy to dent.
Disclosure of Invention
Therefore, the invention provides a sinking-preventing extrusion molding process for a medium-voltage crosslinked cable, which is used for solving the problem that a shielding layer of the medium-voltage crosslinked cable is easy to sink due to high melt pressure at a machine head in the prior art.
In order to achieve the above object, the present invention provides a medium voltage crosslinked cable dent-proof extrusion process, comprising:
s1, preheating, namely preheating the extrusion molding device, and placing a conductor in the center of the extrusion molding device after the extrusion molding device reaches a preheating standard;
s2, feeding, wherein a central control unit in a control analyzer controls a transmission switch of a conductor pipeline connected with a first die, a second intelligent valve of a first material liquid pipeline connected with a second die and a third intelligent valve of a second material liquid and third material liquid shared pipeline connected with a third die in the extrusion molding device to be simultaneously opened so that the first material liquid, the second material liquid and the third material liquid flow into corresponding material liquid pipelines;
s3, performing three-layer co-extrusion, namely performing three-layer co-extrusion on the conductor by using the extrusion molding device so that the first feed liquid covers the surface of the conductor to form a conductor shielding layer, the second feed liquid covers the surface of the conductor shielding layer to form an insulating layer, and the third feed liquid covers the surface of the insulating layer to form an insulating shielding layer; the conductor is an insulated wire core after three-layer co-extrusion is completed;
s4, vulcanizing, namely conveying the insulated wire core subjected to the three-layer co-extrusion to a vulcanizing pipe filled with nitrogen for vulcanizing;
s5, performing online detection, namely judging whether to adjust the operating parameters of the extrusion molding device or not by a central control unit according to the detected data, and detecting again after adjustment; the online detection is full-process monitoring; the operating parameters included extrusion device temperature, conductor transfer rate, monitoring frequency, location of each feed liquid conduit, and nitrogen feed rate into the vulcanization tube.
Further, in the step S3, when the extrusion molding device performs three-layer co-extrusion on the conductor, a first pressure gauge in the extrusion molding device detects a pressure P at the head of the first material liquid pipeline and transmits the detected data to the central control unit, and the central control unit compares the pressure P with a preset standard to determine whether to control the first mold to stretch and contract so as to adjust the pressure at the head of the first mold; the central control unit is provided with a first preset pressure P1, a second preset pressure P2 and a telescopic adjustment coefficient alpha 1, wherein P1 is more than 0 and less than P2, alpha 1 is more than 0 and less than 1,
if P is less than or equal to P1, the central control unit judges that the pressure at the first feed liquid pipeline head is lower than a preset standard range and controls the first die to extend for a distance L along the head direction, and L = (P1-P). Times.alpha.1 is set;
if P1 is larger than P and smaller than or equal to P2, the central control unit judges that the pressure at the head of the first feed liquid pipeline meets a preset standard range and does not control the first die to stretch so as to adjust the pressure at the head of the first feed liquid pipeline;
if P2 is less than P, the central control unit judges that the pressure at the first feed liquid pipeline nose is greater than a preset standard range and controls the first die to shorten the distance L along the nose reverse direction, and sets L = (P-P2) × alpha 1.
Further, when the central control unit judges that the pressure at the head of the first feed liquid pipeline does not accord with the preset standard range and controls the extension distance or the shortening distance of the first die, the central control unit compares the L with the preset standard to judge how to correspondingly adjust the flow velocity V2 of the second feed liquid and the third feed liquid; the central control unit is provided with a first preset distance L1, a second preset distance L2, a first regulating coefficient beta 1 and a second regulating coefficient beta 2, wherein beta 1 is more than 0 and beta 2 is more than 1,
when the central control unit judges that the first feed liquid pipeline is controlled to extend for a distance L along the direction of the machine head, if L is less than or equal to L1, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid does not need to be adjusted;
if L1 is larger than L and smaller than or equal to L2, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is adjusted by using beta 1, the flow velocity of the adjusted second feed liquid and the adjusted third feed liquid is marked as V2', and V2' = V2- (V2 multiplied by beta 1) is set;
if L2 is less than L, the central control unit judges that the flow rate of the second feed liquid and the flow rate of the third feed liquid are adjusted by using beta 2, the flow rates of the adjusted second feed liquid and the adjusted third feed liquid are recorded as V2', and V2' = V2- (V2 multiplied by beta 2);
when the central control unit judges that the first feed liquid pipeline is controlled to shorten the distance L along the direction opposite to the machine head, if L is less than or equal to L1, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid does not need to be adjusted;
if L1 is larger than L and smaller than or equal to L2, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is adjusted by using beta 1, the flow velocity of the adjusted second feed liquid and the adjusted third feed liquid is marked as V2', and V2' = V2+ (V2 x beta 1) is set;
if L2 is less than L, the central control unit determines that the flow rate V2 of the second feed liquid and the third feed liquid is adjusted by using β 2, and the flow rate of the adjusted second feed liquid and the flow rate of the adjusted third feed liquid are recorded as V2', and V2' = V2+ (V2 × β 2).
Further, in the step S4, when the insulated wire core is conveyed to the vulcanization pipe filled with nitrogen for vulcanization, the central control unit controls a gas pressure gauge arranged in the vulcanization pipe to detect a gas pressure P4 in the vulcanization pipe and compares P4 with a preset standard to determine whether to adjust a supply speed Vd of nitrogen in the vulcanization pipe; the central control unit is provided with a first preset air pressure Pa, a second preset air pressure Pb, a first air pressure regulating coefficient gamma 1 and a second air pressure regulating coefficient gamma 2, wherein Pa is more than 0 and less than Pb, gamma 1 is more than 0 and less than 1 and less than gamma 2,
if P4 is less than or equal to Pa, the central control unit judges the air pressure in the vulcanization pipe is lower than or equal to a preset standard and adjusts the nitrogen gas supply speed Vd by using gamma 2, and the adjusted nitrogen gas supply speed is recorded as Vd ', and Vd' = Vd multiplied by gamma 2 is set;
if Pa is more than P4 and less than or equal to Pb, the central control unit judges that the air pressure in the vulcanizing pipe meets the preset standard and does not regulate the supply speed of the nitrogen;
if Pb < P4, the central control unit judges that the air pressure of the vulcanization pipe is higher than a preset standard and adjusts the nitrogen supply speed Vd by using gamma 1, and the adjusted nitrogen supply speed is recorded as Vd ', and Vd' = Vd multiplied by gamma 1 is set.
Further, in the step S5, when the insulated wire core is detected on line, the central control unit receives the damaged position of the surface of the insulated wire core detected by the insulation detector connected to the central control unit, calculates the number N of the damaged positions of the surface of the insulated wire core through the calculation module in the central control unit, and compares N with a preset standard to determine the damaged reason of the surface of the insulated wire core; the central control unit is provided with a first preset damage number N1 and a second preset damage number N2, wherein N1 is more than 0 and less than N2,
if N is less than or equal to N1, the central control unit judges that the surface damage of the insulated wire core is an accidental reason;
if N1 is larger than N and is not larger than N2, the central control unit preliminarily judges that the surface damage of the insulated wire core is caused by the fact that the temperature T of the extrusion molding device is higher than a preset standard, and further judges according to the comparison of T and the preset standard;
and if N2 is less than N, the central control unit judges that the extrusion molding device breaks down and transmits the judgment information to a display screen connected with the control analyzer so as to remind the extrusion molding device of troubleshooting.
Further, when the central control unit preliminarily judges that the surface damage of the insulated wire core is caused by the fact that the temperature T of the extrusion molding device is higher than a preset standard, the central control unit compares the T with the preset standard to judge how to adjust the temperature T of the extrusion molding device; the central control unit is provided with a first preset temperature T1, a second preset temperature T2, a first temperature regulating coefficient c1 and a second temperature regulating coefficient c2, wherein T1 is more than 0 and less than T2, c2 is more than 0 and less than c1 and less than 1,
if T is less than or equal to T1, the central control unit judges that the surface damage of the insulated wire core is not caused by the temperature of the extrusion molding device and compares the conveying speed Vs of the insulated wire core with a preset standard so as to further judge the surface damage reason of the insulated wire core;
if T1 is larger than T and smaller than or equal to T2, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the temperature of the extrusion molding device is higher than a preset standard, c1 is used for adjusting the temperature T of the extrusion molding device, the adjusted temperature of the extrusion molding device is recorded as T ', and T' = T multiplied by c1 is set;
if T2 < T, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the temperature of the extrusion molding device is higher than a preset standard, c2 is used for adjusting the temperature T of the extrusion molding device, the adjusted temperature of the extrusion molding device is recorded as T ', and T' = T multiplied by c2 is set.
Further, when the central control unit judges that the surface damage of the insulated wire core is not caused by the temperature of the extrusion molding device, the central control unit compares the conductor conveying speed Vz with a preset standard to judge whether the conductor conveying speed is adjusted or not; the central control unit is provided with a first preset conveying speed Vz1, a second conveying speed Vz2, a first speed adjusting coefficient epsilon 1 and a second speed adjusting coefficient epsilon 2, wherein Vz1 is more than 0 and less than Vz2, epsilon 2 is more than 0 and less than epsilon 1 and less than 1,
if Vz is less than or equal to Vz1, the central control unit judges that the surface damage of the insulated wire core is not caused by the conductor transmission speed and transmits the judgment information to the display screen connected with the control analyzer to remind troubleshooting of the extrusion molding device;
if Vz1 is larger than Vz and is smaller than or equal to Vz2, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the conductor transmission speed does not meet the preset standard, and adjusts the conductor transmission speed Vz by using epsilon 1, and the adjusted conductor transmission speed is recorded as Vz ', and Vz' = Vz multiplied by epsilon 1 is set;
if Vz2 < Vz, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the conductor conveying speed does not meet the preset standard and adjusts the conductor conveying speed Vz by using epsilon 2, and the adjusted conductor conveying speed is marked as Vz ', and Vz' = Vz multiplied by epsilon 2 is set.
Further, in S5, the central control unit records the detection times M and compares M with a preset standard before performing online detection to determine whether online detection is allowed; the central control unit is provided with the highest detection times Mmax,
if M is less than Mmax, the central control unit judges that the online detection is allowed to be carried out;
and if M is larger than or equal to Mmax, the central control unit judges that the online detection is not allowed to be carried out and transmits a judgment result to the display screen connected with the control analyzer so as to remind the extrusion molding device of troubleshooting.
Further, the first mold, the second mold and the third mold can be extended and retracted under the control of the central control unit.
Further, initial operating parameters of the extrusion device are manually set by the control analyzer.
Compared with the prior art, the invention has the advantages that the flexibility of the first mould is correspondingly adjusted by detecting the pressure of the conductor shielding layer, different adjusting modes are set according to the online detection result, the precision of the extrusion process is improved, the performance of the medium-voltage cross-linked cable is ensured, and the uniformity of the extrusion molding thickness of the medium-voltage cross-linked cable is improved, so that the product quality is improved.
Furthermore, the central control unit compares the P with a preset standard to judge whether to control the first die to stretch and retract so as to adjust the pressure at the head of the first feed liquid pipeline, so that the problem that the conductor shielding layer is sunken due to overlarge pressure at the head is avoided, the precision of the extrusion process is improved, the quality of the prepared medium-voltage cross-linked cable is ensured, the extrusion efficiency of the medium-voltage cross-linked cable is improved, the extrusion thickness uniformity of the medium-voltage cross-linked cable is improved, and the product quality is improved.
Furthermore, a gas pressure instrument is arranged in the vulcanizing pipe and used for detecting the air pressure in the vulcanizing pipe, the central control unit can correspondingly adjust the supply speed of the nitrogen in the vulcanizing pipe according to the air pressure in the vulcanizing pipe, the problem that a conductor shielding layer is sunken in the vulcanizing process due to overlarge air pressure is solved, the quality of the prepared medium-voltage cross-linked cable is ensured, the extrusion molding efficiency of the medium-voltage cross-linked cable is improved, the extrusion molding thickness uniformity of the medium-voltage cross-linked cable is improved, and the product quality is improved.
Furthermore, the central control unit is provided with a first preset damage number and a second preset damage number, the central control unit calculates the number of the damage positions on the surface of the insulated wire core through the calculation module and performs corresponding adjustment, the precision of the extrusion process is improved, the extrusion efficiency of the medium-voltage crosslinked cable is improved while the quality of the prepared medium-voltage crosslinked cable is ensured, and the uniformity of the extrusion thickness of the medium-voltage crosslinked cable is improved, so that the product quality is improved.
Furthermore, the central control unit compares the temperature of the extrusion molding device with a preset standard to judge how to adjust the temperature of the extrusion molding device, so that the problems of large head pressure and poor extrusion stability due to overhigh temperature and low viscosity of the primary feed liquid are solved, the precision of the extrusion process is improved, the quality of the prepared medium-voltage cross-linked cable is ensured, the extrusion efficiency of the medium-voltage cross-linked cable is improved, the uniformity of the extrusion thickness of the medium-voltage cross-linked cable is improved, and the product quality is improved.
Furthermore, the central control unit is provided with the highest detection times, so that the problems of material waste and production time delay caused by repeated detection are solved, the quality of the prepared medium-voltage cross-linked cable is ensured, the extrusion molding efficiency of the medium-voltage cross-linked cable is improved, the extrusion molding thickness uniformity of the medium-voltage cross-linked cable is improved, and the product quality is improved.
Drawings
FIG. 1 is a schematic view of the structure of an extrusion apparatus according to an embodiment of the present invention;
FIG. 2 is a flow chart of an anti-sag extrusion process for a medium voltage crosslinked cable according to an embodiment of the present invention;
fig. 3 is a flowchart of the central control unit comparing P with a preset standard to determine whether to control the first feed liquid pipeline to extend or retract so as to adjust the pressure at the head of the first feed liquid pipeline according to the embodiment of the present invention;
FIG. 4 is a flowchart illustrating the control unit comparing P4 with a predetermined standard to determine whether to adjust the nitrogen gas feeding speed in the vulcanizing tube according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating that the central control unit compares N with a predetermined standard to determine whether the surface of the insulated wire core is damaged according to the embodiment of the present invention;
in the figure, a first die 1, a second die 2, a third die 3, a conductor pipe 4, a first feed liquid pipe 5, and a second feed liquid and third feed liquid common pipe 6 are shown.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, there is shown a schematic structural view of an extrusion molding apparatus according to an embodiment of the present invention, which includes:
an extrusion molding die comprising a third die 3 located on the outer surface of the extrusion molding apparatus, a first die 1 located inside the extrusion molding apparatus, and a second die 2 located between the first die 1 and the third die 3, for extrusion molding of the feed liquid;
a conductor pipe 4 connected to the first mold 1 for transferring a conductor; a transfer switch (not shown) is arranged on the conductor pipeline 4 and used for controlling the transfer and the transfer speed of the conductor;
feed liquid pipelines comprising a first feed liquid pipeline 5 connected with the second die 2 and a second feed liquid and third feed liquid shared pipeline 6 connected with the third die 3 for conveying feed liquid to corresponding pipelines;
the intelligent valves (not shown) comprise a second intelligent valve positioned on the first feed liquid pipeline 5 and a third intelligent valve positioned on the second feed liquid and third feed liquid shared pipeline 6, and are used for controlling the transmission state of the feed liquid in each feed liquid pipeline by switching the opening state of the intelligent valves;
referring to fig. 2, which is a flowchart illustrating a process for extrusion of a medium voltage crosslinked cable with dent prevention according to an embodiment of the present invention, the process for extrusion of a medium voltage crosslinked cable with dent prevention according to an embodiment of the present invention includes:
s1, preheating, namely preheating the extrusion molding device, and placing a conductor in the center of the extrusion molding device after the extrusion molding device reaches a preheating standard;
s2, feeding, wherein a central control unit in a control analyzer controls a transmission switch of a conductor pipeline 4 connected with a first die 1, a second intelligent valve of a first material liquid pipeline 5 connected with a second die 2 and a third intelligent valve of a second material liquid and third material liquid shared pipeline 6 connected with a third die 3 in the extrusion molding device to be simultaneously opened so that the first material liquid, the second material liquid and the third material liquid flow into corresponding material liquid pipelines;
s3, performing three-layer co-extrusion, wherein the extrusion molding device performs three-layer co-extrusion on the conductor so that the first material liquid covers the surface of the conductor to form a conductor shielding layer, the second material liquid covers the surface of the conductor shielding layer to form an insulating layer, and the third material liquid covers the surface of the insulating layer to form an insulating shielding layer; the conductor is an insulated wire core after three-layer co-extrusion is completed;
s4, vulcanizing, namely conveying the insulated wire core subjected to the three-layer co-extrusion to a vulcanizing pipe filled with nitrogen for vulcanizing;
s5, performing online detection, namely judging whether to adjust the operating parameters of the extrusion molding device or not by a central control unit according to the detected data, and detecting again after adjustment; the online detection is full-process monitoring; the operating parameters included extrusion device temperature, conductor transfer rate, monitoring frequency, location of each feed liquid conduit, and nitrogen feed rate into the vulcanization tube.
Referring to fig. 3, which is a flowchart illustrating that the central control unit compares P with a preset standard to determine whether to control the first material liquid pipeline 5 to stretch and contract to adjust the pressure at the head of the first material liquid pipeline 5 according to an embodiment of the present invention, in step S3, when the extrusion molding apparatus performs three-layer co-extrusion on a conductor, a first pressure gauge in the extrusion molding apparatus detects the pressure P at the head of the first material liquid pipeline 5 and transmits the detected data to the central control unit, and the central control unit compares P with the preset standard to determine whether to control the first mold 1 to stretch and contract to adjust the pressure at the head of the first mold 1; the central control unit is provided with a first preset pressure P1, a second preset pressure P2 and a telescopic adjusting coefficient alpha 1, wherein P1=100bar, P2=200bar, alpha 1=0.01,
if P is less than or equal to P1, the central control unit judges that the pressure at the machine head of the first feed liquid pipeline 5 is lower than a preset standard range and controls the first die 1 to extend for a distance L along the machine head direction, and sets L = (P1-P). Times.alpha.1;
if P1 is larger than P and is less than or equal to P2, the central control unit judges that the pressure at the machine head of the first material liquid pipeline 5 meets a preset standard range and does not control the first die 1 to stretch so as to adjust the pressure at the machine head of the first material liquid pipeline 5;
if P2 is less than P, the central control unit judges that the pressure at the nose of the first feed liquid pipeline 5 is greater than a preset standard range and controls the first die 1 to shorten the distance L along the opposite direction of the nose, and sets L = (P-P2) × alpha 1.
Specifically, when the central control unit determines that the pressure at the nose of the first feed liquid pipeline 5 does not meet the preset standard range and controls the first die 1 to extend or shorten the distance, the central control unit compares L with a preset standard to determine how to correspondingly adjust the flow velocity V2 of the second feed liquid and the third feed liquid; the central control unit is provided with a first preset distance L1, a second preset distance L2, a first regulating coefficient beta 1 and a second regulating coefficient beta 2, wherein L1=1mm, L2=2mm, beta 1=0.1, beta 2=0.15,
when the central control unit judges and controls the first feed liquid pipeline 5 to extend for a distance L along the machine head direction, if L is less than or equal to L1, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is not required to be adjusted;
if L1 is larger than L and smaller than or equal to L2, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is adjusted by using beta 1, the flow velocity of the adjusted second feed liquid and the adjusted third feed liquid is marked as V2', and V2' = V2- (V2 multiplied by beta 1) is set;
if L2 is less than L, the central control unit judges that the flow rate of the second feed liquid and the flow rate of the third feed liquid are adjusted by using beta 2, the flow rates of the adjusted second feed liquid and the adjusted third feed liquid are recorded as V2', and V2' = V2- (V2 multiplied by beta 2);
when the central control unit judges that the first feed liquid pipeline 5 is controlled to shorten the distance L along the direction opposite to the machine head, if L is less than or equal to L1, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid does not need to be adjusted;
if L1 is larger than L and smaller than or equal to L2, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is adjusted by using beta 1, the flow velocity of the adjusted second feed liquid and the adjusted third feed liquid is marked as V2', and V2' = V2+ (V2 x beta 1) is set;
if L2 is less than L, the central control unit determines that the flow rate V2 of the second feed liquid and the third feed liquid is adjusted by using β 2, and the flow rate of the adjusted second feed liquid and the flow rate of the adjusted third feed liquid are recorded as V2', and V2' = V2+ (V2 × β 2).
Referring to fig. 4, which is a flowchart illustrating the central control unit comparing P4 with a preset standard to determine whether to adjust the nitrogen gas supply rate in the vulcanization tube according to the embodiment of the present invention, in step S4, when the insulated wire core is conveyed to the vulcanization tube filled with nitrogen gas for vulcanization, the central control unit controls a gas pressure gauge disposed in the vulcanization tube to detect a gas pressure P4 in the vulcanization tube and compares P4 with the preset standard to determine whether to adjust the nitrogen gas supply rate Vd in the vulcanization tube; the central control unit is provided with a first preset air pressure Pa, a second preset air pressure Pb, a first air pressure regulating coefficient gamma 1 and a second air pressure regulating coefficient gamma 2, wherein Pa =8, pb =12, gamma 1=0.6, and gamma 2=1.4,
if P4 is less than or equal to Pa, the central control unit judges the air pressure in the vulcanization pipe is lower than or equal to a preset standard and adjusts the nitrogen gas supply speed Vd by using gamma 2, and the adjusted nitrogen gas supply speed is recorded as Vd ', and Vd' = Vd multiplied by gamma 2 is set;
if Pa is more than P4 and less than or equal to Pb, the central control unit judges that the air pressure in the vulcanizing pipe meets the preset standard and does not adjust the supply speed of the nitrogen;
if Pb < P4, the central control unit judges that the air pressure of the vulcanization pipe is higher than a preset standard and adjusts the nitrogen supply speed Vd by using gamma 1, and the adjusted nitrogen supply speed is recorded as Vd ', and Vd' = Vd multiplied by gamma 1 is set.
Please refer to fig. 5, which is a flowchart illustrating the central control unit comparing N with a preset standard to determine whether the surface of the insulated wire core is damaged according to the embodiment of the present invention, wherein in step S5, when the insulated wire core is detected on line, the central control unit receives the surface damage position of the insulated wire core detected by the insulation detector connected to the central control unit, calculates the number N of the surface damage positions of the insulated wire core through the calculation module in the central control unit, and compares N with the preset standard to determine the surface damage reason of the insulated wire core; the central control unit is provided with a first preset damage number N1 and a second preset damage number N2, wherein N1=5, N2=15,
if N is less than or equal to N1, the central control unit judges that the surface damage of the insulated wire core is an accidental reason;
if N1 is larger than N and is not larger than N2, the central control unit preliminarily judges that the surface damage of the insulated wire core is caused by the fact that the temperature T of the extrusion molding device is higher than a preset standard, and further judges according to the comparison of T and the preset standard;
and if N2 is less than N, the central control unit judges that the extrusion molding device breaks down and transmits the judgment information to a display screen connected with the control analyzer so as to remind the extrusion molding device of troubleshooting.
Continuing to refer to fig. 1 to 5, when the central control unit preliminarily determines that the surface damage of the insulated wire core is caused by the temperature T of the extrusion molding device being higher than the preset standard, the central control unit compares T with the preset standard to determine how to adjust the temperature T of the extrusion molding device; the central control unit is provided with a first preset temperature T1, a second preset temperature T2, a first temperature regulating coefficient c1 and a second temperature regulating coefficient c2, wherein T1=120 ℃, T2=140 ℃, c1=0.9, c2=0.8,
if T is less than or equal to T1, the central control unit judges that the surface damage of the insulated wire core is not caused by the temperature of the extrusion molding device and compares the conveying speed Vs of the insulated wire core with a preset standard so as to further judge the surface damage cause of the insulated wire core;
if T1 is larger than T and is smaller than or equal to T2, the central control unit judges that the damage to the surface of the insulated wire core is caused by the fact that the temperature of the extrusion molding device is higher than a preset standard, c1 is used for adjusting the temperature T of the extrusion molding device, the adjusted temperature of the extrusion molding device is marked as T ', and T' = T multiplied by c1 is set;
if T2 < T, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the temperature of the extrusion molding device is higher than a preset standard, c2 is used for adjusting the temperature T of the extrusion molding device, the adjusted temperature of the extrusion molding device is recorded as T ', and T' = T multiplied by c2 is set.
Specifically, when the central control unit determines that the surface breakage of the insulated wire core is not caused by the temperature of the extrusion apparatus, the central control unit compares the conductor transfer speed Vz with a preset standard to determine whether to adjust the conductor transfer speed; the central control unit is provided with a first preset conveying speed Vz1, a second conveying speed Vz2, a first speed adjusting coefficient epsilon 1 and a second speed adjusting coefficient epsilon 2, wherein Vz1=30m/s, vz2=40m/s, epsilon 1=0.9, epsilon 2=0.8,
if Vz is less than or equal to Vz1, the central control unit judges whether the surface damage of the insulated wire core is caused by the conductor transmission speed and transmits the judgment information to the display screen connected with the control analyzer to remind the extrusion molding device of troubleshooting;
if Vz1 is larger than Vz and smaller than or equal to Vz2, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the conductor conveying speed does not meet the preset standard, and adjusts the conductor conveying speed Vz by using epsilon 1, and the adjusted conductor conveying speed is recorded as Vz ', and Vz' = Vz multiplied by epsilon 1 is set;
if Vz2 < Vz, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the conductor conveying speed does not meet the preset standard and adjusts the conductor conveying speed Vz by using epsilon 2, and the adjusted conductor conveying speed is marked as Vz ', and Vz' = Vz multiplied by epsilon 2 is set.
Specifically, in S5, the central control unit records the detection times M and compares M with a preset standard before performing online detection to determine whether online detection is allowed; the central control unit is provided with the highest detection times Mmax =3,
if M is less than Mmax, the central control unit judges that the online detection is allowed to be carried out;
and if M is larger than or equal to Mmax, the central control unit judges that the online detection is not allowed to be carried out and transmits a judgment result to the display screen connected with the control analyzer so as to remind the extrusion molding device of troubleshooting.
Specifically, the first mold 1, the second mold 2, and the third mold 3 may be extended and contracted by the control of the central control unit.
In particular, the initial operating parameters of the extrusion device are set manually by the control analyzer.
Example 1
In this embodiment, when the apparatus is in operation, the control analyzer controls the first pressure detector to detect the pressure P at the head of the first feed liquid pipeline 5 through the central control unit, and measures that the pressure P =350bar at the head of the first feed liquid pipeline 5, where P > P2, the central control unit determines that the pressure at the head of the first feed liquid pipeline 5 is greater than the preset standard range and controls the first mold 1 to shorten the distance L = (350-200) × 0.01=1.5mm in the opposite direction of the head, where L1 < L2, the central control unit determines that β 1 is used to adjust the flow rates V2 of the second feed liquid and the third feed liquid, where V2=200ml/min of the second feed liquid and the third feed liquid in this embodiment, and the flow rates V2 of the adjusted second feed liquid and third feed liquid are V2'=200- (200 × 0.1) =180ml/min, where P4=15bar inside the sulfidizing pipe is satisfied, where γ 1 is used to adjust the supply rate V2' =200 =0 =1, and Vd '=15 s/m' is used to adjust the supply rate Vd, and Vd 'of the nitrogen is set as 0.6 s/m' in this embodiment. And the control analyzer controls the first pressure detector to detect the pressure P at the head of the first feed liquid pipeline 5 through the central control unit again, so that the pressure P =150bar at the head of the first feed liquid pipeline 5 is detected, at the moment, P1 is more than P and less than P2, and the central control unit judges that the pressure at the head of the first feed liquid pipeline 5 meets a preset standard range.
Example 2
In this embodiment, when the apparatus operates, the control analyzer controls the first pressure detector to detect the pressure P at the head of the first feed liquid pipeline 5 through the central control unit, so as to measure the pressure P =150bar at the head of the first feed liquid pipeline 5, at this time, P1 is greater than P and is less than P2, the central control unit determines that the pressure at the head of the first feed liquid pipeline 5 meets a preset standard range, and does not control the first mold 1 to stretch and contract so as to adjust the pressure at the head of the first feed liquid pipeline 5. In the embodiment, the internal pressure of the vulcanizing tube is P4=10bar, and Pa < P4 < Pb, the central control unit judges that the internal pressure of the vulcanizing tube meets the preset standard and does not adjust the nitrogen gas supply speed. In this embodiment, the number of damaged positions on the surface of the insulated wire core N =10, the central control unit preliminarily determines that the surface of the insulated wire core is damaged due to the fact that the temperature T of the extrusion molding device is higher than the preset standard, and further determines according to the comparison of T and the preset standard, in this embodiment, the temperature T of the extrusion molding device is =130 ℃, at this time, T1 < T2, the central control unit determines that the surface damage of the insulated wire core is caused by the fact that the temperature T of the extrusion molding device is higher than the preset standard, c1 is used for adjusting the temperature T of the extrusion molding device, and the adjusted temperature of the extrusion molding device is recorded as T ', T' =130 × 0.9=117 ℃.
Example 3
In the preferred embodiment of the invention, the second mold 2 is offset by 1 ° with respect to the first mold 1, the conductor shield layer pressure is 250bar, the inner diameter at the head of the second mold 2 is 22.2mm, the inner diameter at the head of the third mold 3 is 35.7mm, and the vulcanizer pressure is 6.5bar.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can be within the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a middling pressure crosslinked cable prevents sunken extrusion molding technology which characterized in that includes:
s1, preheating, namely preheating the extrusion molding device, and placing a conductor in the center of the extrusion molding device after the extrusion molding device reaches a preheating standard;
s2, feeding, wherein a central control unit in a control analyzer controls a transmission switch of a conductor pipeline connected with a first die, a second intelligent valve of a first material liquid pipeline connected with a second die and a third intelligent valve of a second material liquid and third material liquid shared pipeline connected with a third die in the extrusion molding device to be simultaneously opened so that the first material liquid, the second material liquid and the third material liquid flow into corresponding material liquid pipelines;
s3, performing three-layer co-extrusion, namely performing three-layer co-extrusion on the conductor by using the extrusion molding device so that the first feed liquid covers the surface of the conductor to form a conductor shielding layer, the second feed liquid covers the surface of the conductor shielding layer to form an insulating layer, and the third feed liquid covers the surface of the insulating layer to form an insulating shielding layer; the conductor is an insulated wire core after three layers of co-extrusion are finished;
s4, vulcanizing, namely conveying the insulated wire core subjected to the three-layer co-extrusion to a vulcanizing pipe filled with nitrogen for vulcanizing;
s5, performing online detection, namely judging whether to adjust the operation parameters of the extrusion molding device or not by a central control unit according to the detected data, and detecting again after adjustment; the online detection is full-process monitoring; the operating parameters included extrusion device temperature, conductor transfer rate, monitoring frequency, location of each feed liquid conduit, and nitrogen feed rate into the vulcanization tube.
2. The extrusion process for extrusion molding of medium voltage crosslinked cable with dent prevention as claimed in claim 1, wherein in step S3, when the extrusion molding apparatus performs three-layer co-extrusion on the conductor, a first pressure gauge in the extrusion molding apparatus detects the pressure P at the head of the first feed liquid pipe and transmits the detected data to the central control unit, and the central control unit compares P with a preset standard to determine whether to control the first die to extend and retract to adjust the pressure at the head of the first die; the central control unit is provided with a first preset pressure P1, a second preset pressure P2 and a telescopic adjustment coefficient alpha 1, wherein P1 is more than 0 and less than P2, alpha 1 is more than 0 and less than 1,
if P is less than or equal to P1, the central control unit judges that the pressure at the first feed liquid pipeline nose is lower than a preset standard range and controls a first die to extend for a distance L along the nose direction, and L = (P1-P). Times.alpha.1 is set;
if P1 is larger than P and smaller than or equal to P2, the central control unit judges that the pressure at the head of the first feed liquid pipeline meets a preset standard range and does not control the first die to stretch so as to adjust the pressure at the head of the first feed liquid pipeline;
if P2 is less than P, the central control unit judges that the pressure at the first feed liquid pipeline nose is greater than a preset standard range, controls the first die to shorten the distance L along the opposite direction of the nose, and sets L = (P-P2) × alpha 1.
3. The medium voltage crosslinked cable dent-prevention extrusion molding process according to claim 2, wherein when the central control unit determines that the pressure at the first feed liquid pipeline head does not meet the preset standard range and controls the first die to extend or shorten the distance, the central control unit compares L with the preset standard to determine how to adjust the flow rates V2 of the second feed liquid and the third feed liquid accordingly; the central control unit is provided with a first preset distance L1, a second preset distance L2, a first regulating coefficient beta 1 and a second regulating coefficient beta 2, wherein beta 1 is more than 0 and beta 2 is more than 1,
when the central control unit judges that the first feed liquid pipeline is controlled to extend for a distance L along the direction of the machine head, if L is less than or equal to L1, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid does not need to be adjusted;
if L1 is larger than L and smaller than or equal to L2, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is adjusted by using beta 1, the flow velocity of the adjusted second feed liquid and the adjusted third feed liquid is marked as V2', and V2' = V2- (V2 multiplied by beta 1) is set;
if L2 is less than L, the central control unit judges that the flow rate of the second feed liquid and the flow rate of the third feed liquid are adjusted by using beta 2, the flow rates of the adjusted second feed liquid and the adjusted third feed liquid are recorded as V2', and V2' = V2- (V2 multiplied by beta 2);
when the central control unit judges and controls the first feed liquid pipeline to shorten the distance L along the direction opposite to the machine head, if the distance L is less than or equal to L1, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is not required to be adjusted;
if L1 is larger than L and smaller than or equal to L2, the central control unit judges that the flow velocity V2 of the second feed liquid and the third feed liquid is adjusted by using beta 1, the flow velocity of the adjusted second feed liquid and the adjusted third feed liquid is marked as V2', and V2' = V2+ (V2 x beta 1) is set;
if L2 is less than L, the central control unit determines that the flow rate V2 of the second feed liquid and the third feed liquid is adjusted by using β 2, and the flow rate of the adjusted second feed liquid and the flow rate of the adjusted third feed liquid are recorded as V2', and V2' = V2+ (V2 × β 2).
4. The extrusion process of claim 1, wherein in step S4, when the insulated wire core is conveyed to the vulcanization tube filled with nitrogen gas for vulcanization, the central control unit controls a gas pressure gauge arranged in the vulcanization tube to detect a gas pressure P4 in the vulcanization tube and compares P4 with a preset standard to determine whether to adjust a nitrogen gas supply speed Vd in the vulcanization tube; the central control unit is provided with a first preset air pressure Pa, a second preset air pressure Pb, a first air pressure regulating coefficient gamma 1 and a second air pressure regulating coefficient gamma 2, wherein Pa is more than 0 and less than Pb, gamma 1 is more than 0 and less than 1 and less than gamma 2,
if P4 is less than or equal to Pa, the central control unit judges the air pressure in the vulcanization pipe is lower than or equal to a preset standard and adjusts the nitrogen gas supply speed Vd by using gamma 2, and the adjusted nitrogen gas supply speed is recorded as Vd ', and Vd' = Vd multiplied by gamma 2 is set;
if Pa is more than P4 and less than or equal to Pb, the central control unit judges that the air pressure in the vulcanizing pipe meets the preset standard and does not regulate the supply speed of the nitrogen;
if Pb < P4, the central control unit judges that the air pressure of the vulcanizing tube is higher than a preset standard and adjusts the supply speed Vd of the nitrogen by using gamma 1, and the adjusted supply speed of the nitrogen is recorded as Vd ', and Vd' = Vd multiplied by gamma 1 is set.
5. The extrusion process of claim 1, wherein in step S5, when the insulated wire core is detected on line, the central control unit receives the damaged position on the surface of the insulated wire core detected by the insulation detector connected to the central control unit, calculates the number N of damaged positions on the surface of the insulated wire core by the calculation module in the central control unit, and compares N with a preset standard to determine the damaged reason on the surface of the insulated wire core; the central control unit is provided with a first preset damage number N1 and a second preset damage number N2, wherein N1 is more than 0 and less than N2,
if N is less than or equal to N1, the central control unit judges that the surface damage of the insulated wire core is an accidental reason;
if N1 is larger than N and is not larger than N2, the central control unit preliminarily judges that the surface damage of the insulated wire core is caused by the fact that the temperature T of the extrusion molding device is higher than a preset standard, and further judges according to the comparison of T and the preset standard;
and if N2 is less than N, the central control unit judges that the extrusion molding device breaks down and transmits the judgment information to a display screen connected with the control analyzer so as to remind the extrusion molding device of troubleshooting.
6. The medium voltage crosslinked cable dent-prevention extrusion molding process according to claim 5, wherein when the central control unit preliminarily determines that the insulated wire core surface breakage is caused by the extrusion device temperature T being higher than a preset standard, the central control unit compares T with the preset standard to determine how to adjust the extrusion device temperature T; the central control unit is provided with a first preset temperature T1, a second preset temperature T2, a first temperature regulating coefficient c1 and a second temperature regulating coefficient c2, wherein T1 is more than 0 and less than T2, c2 is more than 0 and less than c1 and less than 1,
if T is less than or equal to T1, the central control unit judges that the surface damage of the insulated wire core is not caused by the temperature of the extrusion molding device and compares the conveying speed Vs of the insulated wire core with a preset standard so as to further judge the surface damage reason of the insulated wire core;
if T1 is larger than T and smaller than or equal to T2, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the temperature of the extrusion molding device is higher than a preset standard, c1 is used for adjusting the temperature T of the extrusion molding device, the adjusted temperature of the extrusion molding device is recorded as T ', and T' = T multiplied by c1 is set;
if T2 < T, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the temperature of the extrusion molding device is higher than a preset standard, c2 is used for adjusting the temperature T of the extrusion molding device, the adjusted temperature of the extrusion molding device is recorded as T ', and T' = T multiplied by c2 is set.
7. The medium voltage crosslinked cable dent-prevention extrusion molding process according to claim 6, wherein when the central control unit determines that the insulation core surface breakage is not caused by the extrusion device temperature, the central control unit compares the conductor transfer speed Vz with a preset standard to determine whether to adjust the conductor transfer speed; the central control unit is provided with a first preset conveying speed Vz1, a second conveying speed Vz2, a first speed adjusting coefficient epsilon 1 and a second speed adjusting coefficient epsilon 2, wherein Vz1 is more than 0 and less than Vz2, epsilon 2 is more than 0 and less than epsilon 1 and less than 1,
if Vz is less than or equal to Vz1, the central control unit judges that the surface damage of the insulated wire core is not caused by the conductor transmission speed and transmits the judgment information to the display screen connected with the control analyzer to remind troubleshooting of the extrusion molding device;
if Vz1 is larger than Vz and is smaller than or equal to Vz2, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the conductor transmission speed does not meet the preset standard, and adjusts the conductor transmission speed Vz by using epsilon 1, and the adjusted conductor transmission speed is recorded as Vz ', and Vz' = Vz multiplied by epsilon 1 is set;
if Vz2 < Vz, the central control unit judges that the surface damage of the insulated wire core is caused by the fact that the conductor conveying speed does not meet the preset standard and adjusts the conductor conveying speed Vz by using epsilon 2, and the adjusted conductor conveying speed is marked as Vz ', and Vz' = Vz multiplied by epsilon 2 is set.
8. The extrusion process for extrusion molding of medium voltage crosslinked cable with dent prevention according to claim 1, wherein in S5, the central control unit records the number of times of detection M and compares M with a preset standard to determine whether online detection is allowed before online detection; the central control unit is provided with the highest detection times Mmax,
if M is less than Mmax, the central control unit judges that the online detection is allowed to be carried out;
and if M is larger than or equal to Mmax, the central control unit judges that the online detection is not allowed to be carried out and transmits a judgment result to the display screen connected with the control analyzer so as to remind the extrusion molding device of troubleshooting.
9. The medium voltage crosslinked cable dent-prevention extrusion molding process according to claim 1, wherein the first mold, the second mold and the third mold are all retractable by the control of the central control unit.
10. The medium voltage crosslinked cable dent-proof extrusion process according to claim 1, wherein the initial operating parameters of the extrusion device are manually set by the control analyzer.
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