CN111667955A - Fireproof flexible cable production process and flexible fireproof cable produced by same - Google Patents
Fireproof flexible cable production process and flexible fireproof cable produced by same Download PDFInfo
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- CN111667955A CN111667955A CN202010451352.4A CN202010451352A CN111667955A CN 111667955 A CN111667955 A CN 111667955A CN 202010451352 A CN202010451352 A CN 202010451352A CN 111667955 A CN111667955 A CN 111667955A
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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
- H01B13/02—Stranding-up
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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
- H01B13/02—Stranding-up
- H01B13/0207—Details; Auxiliary devices
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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
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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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- 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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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Abstract
The invention belongs to the technical field of preparation of fireproof cables, and particularly relates to a fireproof flexible cable production process and a fireproof flexible cable produced by the fireproof flexible cable production process, wherein an insulation detection device used in the process comprises a base, a first roller, a first hollow column, an induction unit, a first limiting plate and a controller; the base is fixedly connected with two first limiting plates, a through hole is formed in the center of each first limiting plate, the cross section of each first limiting plate is L-shaped, and a first groove is formed in the upper portion and the lower portion of the end face of one first limiting plate; according to the insulation detection device used in the fireproof flexible cable production process, the sensing unit arranged on the inner wall of the first hollow column is abutted to the plastic insulator of the lead, and then the pressure change on the pressure sensor is used for judging that the outer wall of the lead is damaged and further judging that the outer wall of the lead is not insulated, so that the potential safety hazard that the inner wire harness is not exposed when the plastic insulator is damaged is solved.
Description
Technical Field
The invention belongs to the technical field of fireproof cables, and particularly relates to a fireproof flexible cable production process and a fireproof flexible cable produced by the fireproof flexible cable.
Background
The power communication cable product plays a role in transmitting electric energy, important data, images and other information in building and equipment engineering safety systems, and the conventional cable product often has a series of problems of combustion supporting, even toxic gas release and the like in a fire disaster and harms the safety of lives and properties of people, so that irrecoverable loss and negative effects are brought. According to statistics, the occurrence of building fire caused by the fire of the electric lines in places with dense crowds, high-rise important buildings, office buildings and the like causes huge loss to people. In view of the fact that cables are hidden in laying, flexible in burning and toxic in burning smoke in fire, various fire prevention requirements are put forward for electric wires and cables in relevant departments of fire fighting and building design so as to adapt to and meet the increasing safety requirements of people. The fireproof cable needs to have certain resistance and inhibition capability to fire, such as flame retardance, fire resistance, low smoke and no resistance. Except meeting the fire prevention function, the cable is when guaranteeing power transmission, also can provide information transmission, provide the communication function of circuit temperature parameter often for architectural equipment etc. in addition, provides higher and higher requirement to traditional fire prevention cable.
In the process of producing the flexible fireproof cable, the insulation detection of a plastic insulator on the outer wall of a lead is needed, the detection equipment is a spark tester, the device loads a set voltage value to the plastic insulator periodically according to a certain rule, and the lead part is grounded, so that a voltage difference is formed between the lead and the surface of the plastic insulator, the insulation layer can be detected to be poor, if the plastic insulator is provided with a gap, the inner lead is not exposed, the spark tester cannot detect the gap, and the potential leakage hazard of the lead is caused.
Some technical solutions related to a production process of a fireproof flexible cable also appear in the prior art, for example, a chinese patent with application number CN201810773330.2 discloses a production process of a fireproof flexible cable and a flexible fireproof cable produced by the same, wherein the production process of the fireproof flexible cable comprises unreeling, straightening, injection molding, cladding, cabling and reeling; the device used by the invention adopts the single copper core, the inside of the device is compact, and the section of the copper core is the power transmission section of the cable, so that no redundant space is generated inside the cable, and the weight and the material consumption of the power transmission line falling in unit length are reduced; but the fireproof flexible cable production process in the technical scheme does not effectively solve the technical hidden trouble that the plastic insulator is provided with a gap and the inner lead is not exposed and cannot be detected.
In view of this, in order to overcome the above technical problems, the present applicant has devised and developed a fireproof flexible cable production process and a fireproof flexible cable produced thereby, and adopted a special manufacturing apparatus and process to solve the above technical problems.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a fireproof flexible cable production process and a fireproof flexible cable produced by the fireproof flexible cable production process.
The invention relates to a production process of a fireproof flexible cable, which comprises the following steps:
s1: wrapping the electric wire with glue: firstly, a single bare copper wire is twisted into a strand through a stranding machine after being detected to be defect-free through a machine, then the strand is wrapped with a layer of plastic insulator on the outer side of the strand through an extruder to be made into a lead, and then the lead is cooled through a cold water pool; the defective electric wires are removed in advance, so that rework treatment in the later period is avoided, the yield of the cable is improved, the phenomenon of short circuit between the wires is avoided by wrapping a layer of plastic insulator on the outer side of the wire harness, and the extruded wires are cooled in a cold water tank, so that the characteristic of improving the hardness of the plastic insulator is achieved;
s2: insulation monitoring, namely enabling the lead in S1 to pass through five groups of induction units arranged on the inner wall of a first hollow column on an insulation detection device, enabling an induction head of each induction unit to abut against the outer wall of the lead, judging the outer wall of the lead to be qualified through pressure change on a pressure sensor, and further judging the insulation of the outer wall of the lead; when the induction head is abutted against the outer wall of the wire, the bottom end of the induction head transmits pressure to the pressure sensors through the first spring, the pressure sensors transmit data to the controller, the pressure value on the display screen is 0.7-1.2N at the moment, if the plastic insulator is damaged, one of the pressure sensors can fluctuate beyond the range, so that the outer wall of the wire is judged to be damaged, and if the outer wall of the wire is not damaged, the outer wall of the wire is insulated;
s3: manufacturing a wire core: wrapping an aluminized polyester sheath on the outer wall of the wire by a machine, wrapping a mica tape on the periphery of the aluminized polyester sheath, and wrapping a ceramic silicon rubber layer outside the mica tape by an extruder to form a wire core; the aluminum-plated polyester sheath can eliminate electrostatic effect, improves the barrier property to gas, water vapor and light, achieves the purpose of high temperature fire resistance through the mica tape, ensures the insulating property of the cable, has fire resistance, becomes hard at 650 ℃ and above, can reach 3000 ℃ at most, can be rapidly fired into a ceramic-shaped hard complete shell along with the rise of temperature, the longer the burning time is, the higher the temperature is, the harder the shell is, and the hard shell after burning plays a role in protecting a circuit;
s4: filling with a filler: the cable core is orderly arranged, then the filler is added, and then the cable core is wrapped by a wrapping tape, wherein the filler is prepared from the following raw materials in percentage by weight: perlite powder: magnesium oxide: binder 15: 30: 1; the magnesium oxide is burnt at a high temperature of more than 1000 ℃ to be converted into crystals, and then the perlite powder has the characteristics of low heat conductivity coefficient and non-burning, so that the inner wire core is protected, and the fire resistance of the cable is improved;
s5: interlocking and armoring: installing a layer of armor layer on the outer surface of the wrapped wrapping tape in S2, wherein the armor layer is made of aluminum alloy; the common steel-tape armor layer can generate eddy current loss, so that electric energy is lost, but the aluminum alloy armor layer can enhance the compressive strength and weaken the eddy current loss;
s6: and (3) extrusion molding: wrapping a layer of ceramic silicon rubber outside the armor layer by an extruder to prepare a cable; when a fire disaster happens, the ceramic silicon rubber at the outermost layer of the cable is firstly contacted with flame, so that the aim of protection is firstly achieved through the characteristics of the ceramic silicon rubber;
the insulation detection device in the S2 comprises a base, a first roller, a first hollow column, an induction unit, a first limiting plate and a controller; the base is fixedly connected with two first limiting plates, a through hole is formed in the center of each first limiting plate, the cross section of each first limiting plate is L-shaped, a first groove is formed in the upper portion and the lower portion of the end face of one first limiting plate, a first roller is rotatably connected between the two first limiting plates, a second groove is formed in the upper portion and the lower portion of the end face of the first roller, and the specification of each first groove is consistent with that of the second groove; the inner wall of the first roller is connected with a first hollow column in a sliding mode, the upper portion and the lower portion of one end of the first hollow column are fixedly connected with lugs, each lug can slide along a corresponding first groove, each lug is connected into a second groove in a sliding mode, five groups of mounting grooves are formed in the inner side wall of the first hollow column, one group of mounting grooves is at least eight, the positions of the mounting grooves in each group are staggered, an induction unit is installed in each mounting groove and comprises an induction head, a first spring and a pressure sensor, the induction head is conical in structure, the top end of the induction head is blunt, the bottom end of the induction head is connected with the first spring, the other end of the first spring is connected with the pressure sensor, and the pressure sensor is attached to the inner wall of the first roller; the controller is used for controlling the automatic operation of the insulation detection device; when the device is used, the spark tester loads a set voltage value on the plastic insulator periodically according to a certain rule, and the wire part is grounded, so that a voltage difference is formed between the wire and the surface of the plastic insulator, and the poor insulating layer can be detected; therefore, the wire passes through the first hollow column, five groups of sensing units are mounted on the inner wall of the first hollow column, the sensing head of each sensing unit abuts against the outer wall of the wire, the bottom end of the sensing head transmits pressure to the pressure sensor through the first spring, the pressure sensor transmits data to the controller, the pressure value on the display screen is 0.7-1.2N at the moment, if the plastic insulator is damaged, the pressure of the sensing head is reduced until one pressure sensor fluctuates to exceed the range, and therefore the outer wall of the wire is judged to be damaged, and if the plastic insulator is not damaged, the outer wall of the wire is insulated; the positions of each group of mounting grooves are staggered, so that the outer wall of the lead can be detected, the top end of the induction head is blunted, the surface plastic insulator of the lead is prevented from being scratched, friction with the plastic insulator is reduced, and if an induction unit on the inner wall of the first hollow column is damaged, the convex block can sequentially slide out along the second groove and the first groove, so that the first hollow column is driven to slide out along the first roller, and the damaged induction unit is replaced; according to the invention, the sensing unit arranged on the inner wall of the first hollow column is abutted against the plastic insulator of the lead, and then the pressure change on the pressure sensor is used for judging whether the outer wall of the lead is damaged or not, so that the problem that the potential safety hazard that an internal wiring harness is exposed when the plastic insulator is damaged is solved.
Preferably, a motor is arranged on the base, a third gear is connected with the motor key, the third gear is meshed with a second gear, a first gear is arranged on the outer wall of the first roller, and the first gear is meshed with the second gear; when the hollow column is used, a worker cannot find the damaged sensing unit in time due to the fact that the sensing unit on the inner side wall of the first hollow column is damaged, and therefore detection can be invalid; when the lead passes through the induction units on the inner wall of the first hollow column, the controller controls the motor to drive the third gear to rotate, the third gear drives the second gear to rotate, the second gear drives the first gear to rotate, so that the first roller is driven to rotate along the two first limiting plates, and the first roller drives the first hollow column to rotate because the convex blocks on the first hollow column are connected in the second groove on the first roller in a sliding manner, so that the five groups of induction units are driven to rotate along the lead, and if one induction unit is damaged, other induction units can still detect the plastic insulator of the lead; according to the invention, the induction unit is driven by the motor to rotate around the outer wall of the lead, so that the stability of the insulation detection device is improved.
Preferably, the base is fixedly connected with two second limiting plates, a through hole is formed in the center of each second limiting plate, a second roller is rotatably connected between the two second limiting plates, a through hole is formed in the lower portion of one end of the second roller, and artificial sponge is adhered to the inner wall of the second roller; when the insulation detection device is used, water drops on the outer wall of the lead can flow into the mounting groove on the inner wall of the first hollow column when passing through the sensing unit, so that the pressure sensor in the mounting groove is damaged, the insulation detection device fails, and the sensing unit can be misjudged by granular plastic cement adhered to the outer wall of the lead; therefore, the wire firstly passes through the artificial sponge arranged on the inner wall of the second roller, water drops on the outer wall of the wire are absorbed by the artificial sponge, the absorbed water is discharged by the artificial sponge through the through holes, granular plastic cement adhered on the outer wall of the wire is scraped by the artificial sponge, the surface of the wire is cleaner, and the detection is realized by the sensing unit on the first hollow column, so that the detection accuracy of the sensing unit is improved; according to the invention, the artificial sponge on the second roller can absorb moisture and take out impurities on the surface of the wire, so that the accuracy of the insulation detection device is improved.
Preferably, a group of concave cavities are formed in one end of the artificial sponge on the inner wall of the second roller, the number of the concave cavities is at least four, the bottom of each concave cavity is connected with a second spring, and the other end of each second spring is connected with a wax block; when the wire is used, after moisture and impurities are removed through the artificial sponge, the outer surface of the wire is dry, if the wire is directly rubbed with the induction head of the induction unit, the induction head is seriously abraded, and the service life of the induction head is shortened; therefore, when the wire passes through the artificial sponge, water is absorbed firstly, the wax block is arranged at the other end of the artificial sponge and is in contact with the outer wall of the wire through the elasticity of the second spring, so that a layer of wax film is plated on the outer wall of the wire, when the wire plated with the wax film is in contact with the induction head on the induction unit, the friction force between the wire and the induction head is reduced, and the service life of the induction head is prolonged; according to the invention, the wax block arranged at one end of the artificial sponge rubs with the outer wall of the lead, so that the outer wall of the lead is coated with a layer of wax film, the friction force with the induction head is reduced, and the service life of the induction unit is prolonged.
Preferably, the outer wall of the second roller is provided with a fourth gear, the fourth gear is meshed with a fifth gear, and the fifth gear is connected to the second gear through a transmission rod; when the artificial sponge is used, the lead passes through the artificial sponge in a static state, so that the artificial sponge has limited impurity removal capacity, and the outer wall of the lead can not be fully plated with a wax film by a wax block in the artificial sponge; therefore, when the controller controls the motor to drive the second gear to rotate, the fifth gear is connected to the second gear through the transmission rod, so that the fifth gear can rotate along with the fifth gear, the fourth gear is driven to rotate, the second roller drives the artificial sponge to rotate, the artificial sponge rotates along the lead, the friction time between the artificial sponge and the outer wall of the lead is prolonged, and the outer wall of the lead can be fully coated with the wax film by the wax block; the motor drives the artificial sponge on the second roller to rotate, so that the outer wall of the wire is cleaned more cleanly, and the outer wall of the wire is coated with the wax film without dead angles, thereby improving the accuracy and prolonging the service life of the induction element.
A flexible fireproof cable is suitable for the fireproof flexible cable production process and comprises a copper wire, a plastic insulator, a polyester sheath, a mica tape, ceramic silicon rubber, a filler, a wrapping tape and an armor layer; the surface of the polyester sheath is subjected to aluminum plating treatment, the ceramic silicon rubber is divided into two parts, and the filler comprises perlite powder, magnesium oxide and an adhesive; firstly, a single undamaged copper wire is twisted into a strand of wire bundle through a wire twisting machine, a layer of plastic insulator wraps the outer side of the strand of wire bundle, the phenomenon of short circuit between wires is avoided, the extruded wires are cooled through a cold water tank, the hardness of the plastic insulator is improved, then the wires pass through five groups of induction units arranged on the inner wall of a hollow column, and the outer wall of the wires is judged to be damaged through pressure change on a pressure sensor, so that the outer wall of the wires is judged to be uninsulated; the polyester sheath through aluminizing can eliminate the electrostatic effect, reach high temperature fire-resistant purpose through the mica tape, pottery porcelain silicone rubber rises along with the temperature, the casing is harder, hard shell after the burning plays the guard action to the circuit, rethread perlite powder coefficient of heat conductivity is low and non-combustible's characteristic, thereby the fire resistance of cable has been improved, can also weaken the eddy current loss when can strengthen compressive strength with the aluminum alloy armor, when the conflagration breaing out, the outermost pottery porcelain silicone rubber of cable contacts with flame at first, thereby reach the purpose of protection at first through the characteristic of pottery silicone rubber.
The invention has the following beneficial effects:
1. the insulation detection device used in the invention judges that the outer wall of the lead is damaged through the fact that the sensing unit arranged on the inner wall of the first hollow column abuts against the plastic insulator of the lead and then the pressure on the pressure sensor changes, so that the outer wall of the lead is not insulated, and the potential safety hazard that the inner wire harness is not exposed when the plastic insulator is damaged is solved.
2. The insulation detection device used in the invention drives the induction unit to rotate around the outer wall of the lead through the motor, thereby improving the stability of the insulation detection device.
3. The insulation detection device used in the invention has the characteristics that the artificial sponge on the second roller can absorb moisture and take out impurities on the surface of the wire, so that the accuracy of the insulation detection device is improved.
Drawings
The invention is further described with reference to the following figures and embodiments.
FIG. 1 is a flow chart of the process for producing a fire-retardant flexible cable according to the present invention;
FIG. 2 is a perspective view of an insulation detection device used in the present invention;
FIG. 3 is a structural view of a first drum and a first hollow column according to the present invention;
FIG. 4 is a structural position diagram of a sensing unit according to the present invention;
FIG. 5 is a view showing the construction of a No. two roller and an artificial sponge according to the present invention;
FIG. 6 is a view of the structural position of the wax block of the present invention;
FIG. 7 is a cross-sectional view of a flexible fire-rated cable according to the present invention;
in the figure: the device comprises a base 1, a first roller 2, a first hollow column 3, an induction unit 4, an induction head 41, a first spring 42, a pressure sensor 43, a first limit plate 5, a controller 6, a bump 7, a first gear 8, a second gear 9, a third gear 10, a second limit plate 11, a second roller 12, an artificial sponge 13, a wax block 14, a fourth gear 15, a fifth gear 16, a copper wire 17, a plastic insulator 18, a polyester sheath 19, a mica tape 20, a ceramic silicon rubber 21, a filler 22, an armor layer 23, a wrapping tape 24 and a second spring 25.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 7, the production process of the fireproof flexible cable of the present invention includes the following steps:
s1: wrapping the electric wire with glue: firstly, a single bare copper wire 17 is twisted into a strand through a stranding machine after being detected to be defect-free through a machine, then the strand is wrapped with a layer of plastic insulator 18 on the outer side of the strand through an extruder to be made into a lead, and then the lead is cooled through a cold water pool; the defective electric wires are removed in advance, so that rework treatment in the later period is avoided, the yield of the cable is improved, the phenomenon of short circuit between the wires is avoided by wrapping a layer of plastic insulator 18 on the outer side of the wire harness, and the extruded wires are cooled in a cold water tank, so that the characteristic of improving the hardness of the plastic insulator 18 is achieved;
s2: insulation monitoring, namely passing the lead in S1 through five groups of induction units 4 arranged on the inner wall of a first hollow column 3 on an insulation detection device, wherein an induction head 41 of each induction unit 4 is abutted against the outer wall of the lead, and the outer wall of the lead is judged to be damaged through pressure change on a pressure sensor 43, so that the outer wall of the lead is judged to be uninsulated; when the induction head 41 is abutted against the outer wall of the lead, the bottom end of the induction head 41 transmits pressure to the pressure sensors 43 through the first spring 42, the pressure sensors 43 transmit data to the controller 6, the pressure value on the display screen is 0.7-1.2N at the moment, if the plastic insulator 18 is damaged, one of the pressure sensors 43 fluctuates to exceed the range, so that the outer wall of the lead is judged to be damaged, and if the outer wall of the lead is not damaged, the outer wall of the lead is insulated;
s3: manufacturing a wire core: wrapping an aluminized polyester sheath 19 on the outer wall of the wire by a machine, wrapping a mica tape 20 on the periphery of the aluminized polyester sheath 19, and wrapping a ceramic silicon rubber 21 outside the mica tape 20 by an extruder to prepare a wire core; the aluminum-plated polyester sheath 19 can eliminate the electrostatic effect, improve the barrier property to gas, water vapor and light, and achieve the purpose of high temperature fire resistance through the mica tape 20, the ceramic silicon rubber 21 has the fire resistance property while ensuring the insulating property of the cable, and becomes hard at 650 ℃ and above, the maximum temperature can reach 3000 ℃, and the ceramic silicon rubber can be rapidly fired into a ceramic-shaped hard complete shell along with the rise of the temperature, the longer the burning time is, the higher the temperature is, the harder the shell is, and the hard shell after burning plays a role in protecting the circuit;
s4: filling with the filler 22: the cable core is orderly arranged, then the filler 22 is added, and then the cable core is wrapped by the wrapping tape 24, wherein the filler 22 is prepared from the following raw materials in percentage by weight: perlite powder: magnesium oxide: binder 15: 30: 1; the magnesium oxide is burnt at a high temperature of more than 1000 ℃ to be converted into crystals, and then the perlite powder has the characteristics of low heat conductivity coefficient and non-burning, so that the inner wire core is protected, and the fire resistance of the cable is improved;
s5: interlocking and armoring: in S2, a layer of armor layer 23 is arranged on the outer surface of the wrapped wrapping tape 24, and the armor layer 23 is made of aluminum alloy; the common steel-tape armor layer 23 can generate eddy current loss, so that electric energy is lost, but the aluminum alloy armor layer 23 can enhance the compressive strength and weaken the eddy current loss;
s6: and (3) extrusion molding: wrapping a layer of ceramic silicon rubber 21 outside the armor layer 23 by an extruder to prepare a cable; when a fire disaster happens, the ceramic silicon rubber 21 at the outermost layer of the cable is firstly contacted with flame, so that the aim of protection is firstly achieved through the characteristics of the ceramic silicon rubber;
the insulation detection device in the S2 comprises a base 1, a first roller 2, a first hollow column 3, a sensing unit 4, a first limiting plate 5 and a controller 6; the base 1 is fixedly connected with two first limiting plates 5, a through hole is formed in the center of each first limiting plate 5, the cross section of each first limiting plate 5 is L-shaped, a first groove is formed in the upper portion and the lower portion of the end face of one first limiting plate 5, a first roller 2 is rotatably connected between the two first limiting plates 5, a second groove is formed in the upper portion and the lower portion of the end face of the first roller 2, and the specification of each first groove is consistent with that of the second groove; the inner wall of the first roller 2 is connected with a first hollow column 3 in a sliding way, the upper part and the lower part of one end of the first hollow column 3 are fixedly connected with convex blocks 7, each convex block 7 can slide along a corresponding first groove, each convex block 7 is connected in a second groove in a sliding way, five groups of mounting grooves are arranged on the inner side wall of the first hollow column 3, at least eight mounting grooves are arranged in one group, the positions of the mounting grooves in each group are staggered, an induction unit 4 is arranged in each mounting groove, the sensing unit 4 comprises a sensing head 41, a first spring 42 and a pressure sensor 43, wherein the sensing head 41 is conical, the top end of the induction head 41 is blunt, the bottom end of the induction head 41 is connected with a first spring 42, the other end of the first spring 42 is connected with a pressure sensor 43, and the pressure sensor 43 is attached to the inner wall of the first roller 2; the controller 6 is used for controlling the automatic operation of the insulation detection device; when the device is used, the spark tester loads a set voltage value on the plastic insulator 18 periodically according to a certain rule, and the wire part is grounded, so that a voltage difference is formed between the wire and the surface of the plastic insulator 18, and the poor insulating layer can be detected; therefore, the wire passes through the first hollow column 3, five groups of sensing units 4 are mounted on the inner wall of the first hollow column 3, a sensing head 41 of each sensing unit 4 abuts against the outer wall of the wire, the bottom end of the sensing head 41 transmits pressure to a pressure sensor 43 through a spring 42, the pressure sensor 43 transmits data to a controller 6, the pressure value on a display screen is 0.7-1.2N, if the plastic insulator 18 is damaged, the pressure of the sensing head 41 is reduced until one pressure sensor 43 fluctuates to exceed the range, and therefore the outer wall of the wire is judged to be damaged, and if the plastic insulator 18 is not damaged, the outer wall of the wire is insulated; the positions of each group of mounting grooves are staggered, so that the outer wall of the lead can be detected, the top end of the induction head 41 is blunted, the surface plastic insulator 18 of the lead is prevented from being scratched, friction with the plastic insulator 18 is reduced, and if the induction unit 4 on the inner wall of the first hollow column 3 is damaged, the lug 7 can sequentially slide out along the second groove and the first groove, so that the first hollow column 3 is driven to slide out along the first roller 2, and the damaged induction unit 4 is replaced; according to the invention, the sensing unit 4 arranged on the inner wall of the first hollow column 3 is abutted against the plastic insulator 18 of the lead, and then the pressure change on the pressure sensor 43 is utilized to judge that the outer wall of the lead is damaged, so that the outer wall of the lead is not insulated, and the potential safety hazard that the inner wire harness is not exposed when the plastic insulator 18 is damaged is solved.
As an embodiment of the invention, a motor is arranged on the base 1, the motor is connected with a third gear 10 through a key, the third gear 10 is meshed with a second gear 9, a first gear 8 is arranged on the outer wall of the first roller 2, and the first gear 8 is meshed with the second gear 9; when the detection device is used, a worker cannot find the detection failure in time due to the fact that one induction unit 4 on the inner side wall of the first hollow column 3 is damaged; therefore, when the lead passes through the induction units 4 on the inner wall of the first hollow column 3, the controller 6 controls the motor to drive the third gear 10 to rotate, the third gear 10 drives the second gear 9 to rotate, the second gear 9 drives the first gear 8 to rotate, so that the first roller 2 is driven to rotate along the two first limiting plates 5, and the lug 7 on the first hollow column 3 is connected in the second groove on the first roller 2 in a sliding manner, so that the first roller 2 drives the first hollow column 3 to rotate, so that the five groups of induction units 4 are driven to rotate along the lead, and if one induction unit 4 is damaged, the other induction units 4 can still detect the plastic insulator 18 of the lead; according to the invention, the induction unit 4 is driven by the motor to rotate around the outer wall of the lead, so that the stability of the insulation detection device is improved.
As an embodiment of the invention, two second limiting plates 11 are fixedly connected to the base 1, a through hole is formed in the center of each second limiting plate 11, a second roller 12 is rotatably connected between the two second limiting plates 11, a through hole is formed in the lower portion of one end of the second roller 12, and an artificial sponge 13 is adhered to the inner wall of the second roller 12; when the device is used, water drops on the outer wall of the lead can flow into the mounting groove on the inner wall of the first hollow column 3 when passing through the sensing unit 4, so that the pressure sensor 43 in the mounting groove is damaged, the failure of the insulation detection device is caused, and the granular plastic cement adhered on the outer wall of the lead can also cause misjudgment on the sensing unit 4; therefore, the wire firstly passes through the artificial sponge 13 arranged on the inner wall of the second roller, water drops on the outer wall of the wire are absorbed by the artificial sponge 13, the absorbed water is discharged through the through holes by the artificial sponge 13, and granular plastic cement adhered on the outer wall of the wire is scraped off by the artificial sponge 13, so that the surface of the wire is cleaner, and the detection is realized by the sensing unit 4 on the first hollow column 3, so that the detection accuracy of the sensing unit 4 is improved; according to the invention, the artificial sponge 13 on the second roller 12 can absorb moisture and take out impurities on the surface of the wire, so that the accuracy of the insulation detection device is improved.
As an embodiment of the invention, a group of recesses are arranged inside one end of the artificial sponge 13 on the inner wall of the second roller 12, the number of the recesses is at least four, the bottom of each recess is connected with a second spring 25, and the other end of the second spring 25 is connected with a wax block 14; when the wire is used, after moisture and impurities are removed through the artificial sponge 13, the outer surface of the wire is dry, if the wire is directly rubbed with the induction head 41 of the induction unit 4, the induction head 41 is seriously abraded, and the service life of the induction head 41 is shortened; therefore, when the lead passes through the artificial sponge 13, moisture is absorbed firstly, the wax block 14 is arranged at the other end of the artificial sponge 13, the wax block 14 is contacted with the outer wall of the lead through the elasticity of the second spring 25, so that a layer of wax film is plated on the outer wall of the lead, when the lead after being plated with the wax film is contacted with the induction head 41 on the induction unit 4, the friction force between the lead and the induction head 41 is reduced, and the service life of the induction head 41 is prolonged; according to the invention, the wax block 14 arranged at one end of the artificial sponge 13 rubs with the outer wall of the lead, so that a layer of wax film is plated on the outer wall of the lead, the friction force between the lead and the induction head 41 is reduced, and the service life of the induction unit 4 is prolonged.
As an embodiment of the invention, a fourth gear 15 is arranged on the outer wall of the second roller 12, the fourth gear 15 is meshed with a fifth gear 16, and the fifth gear 16 is connected to the second gear 9 through a transmission rod; when the artificial sponge 13 is used, the lead passes through the artificial sponge 13 in a static state, so that the artificial sponge 13 has limited impurity removal capacity, and the outer wall of the lead cannot be fully plated with a wax film by the wax block 14 in the artificial sponge 13; therefore, when the controller 6 controls the motor to drive the second gear 9 to rotate, the fifth gear 16 is connected to the second gear 9 through the transmission rod, so that the fifth gear 16 also rotates along with the second gear, the fourth gear 15 is driven to rotate, the second roller 12 drives the artificial sponge 13 to rotate, the artificial sponge 13 rotates along the lead, the friction time between the artificial sponge 13 and the outer wall of the lead is prolonged, and the outer wall of the lead can be fully coated with the wax film by the wax block 14; according to the invention, the motor drives the artificial sponge 13 on the second roller 12 to rotate, so that the outer wall of the wire is cleaned more cleanly, and the outer wall of the wire is coated with the wax film without dead angles, thereby improving the accuracy and the service life of the induction element.
A flexible fireproof cable is suitable for the fireproof flexible cable production process and comprises a copper wire 17, a plastic insulator 18, a polyester sheath 19, a mica tape 20, ceramic silicon rubber 21, a filler 22, a wrapping tape 24 and an armor layer 23; the surface of the polyester sheath 19 is subjected to aluminizing treatment, the ceramic silicon rubber 21 is divided into two parts, and the filler 22 comprises perlite powder, magnesium oxide and an adhesive; firstly, twisting a single copper wire 17 which is not damaged into a strand through a stranding machine, wrapping a layer of plastic insulator 18 on the outer side of the strand, so that the phenomenon of short circuit between wires is avoided, cooling the extruded wires through a cold water tank to achieve the characteristic of improving the hardness of the plastic insulator 18, then, passing the wires through five groups of induction units 4 arranged on the inner wall of a hollow column 3, judging that the outer wall of the wires is damaged through the pressure change on a pressure sensor 43, and further judging that the outer wall of the wires is not insulated; the polyester sheath 19 through aluminizing can eliminate the electrostatic effect, reach high temperature fire-resistant purpose through the mica tape 20, pottery silicone rubber 21 is along with the temperature rise, the casing is harder, hard shell after the burning plays the guard action to the circuit, the characteristics of the low and incombustible coefficient of pearlite powder thermal conductivity of rethread, thereby the fire resistance of cable has been improved, can also weaken the eddy current loss when can strengthen compressive strength with aluminum alloy armor layer 23, when the conflagration breaks out, pottery silicone rubber 21 of cable outmost contacts with flame at first, thereby reach the purpose of protection at first through the characteristic of pottery silicone rubber.
When the wire is used, the wire firstly passes through the artificial sponge 13 arranged on the inner wall of the second roller, the controller 6 controls the motor to drive the second gear 9 to rotate, and simultaneously, the fifth gear 16 is connected to the second gear 9 through the transmission rod, so the fifth gear 16 also rotates along with the motor, and the fourth gear 15 is driven to rotate, so that the second roller 12 drives the artificial sponge 13 to rotate, so that the artificial sponge 13 rotates along the wire, the friction time between the artificial sponge 13 and the outer wall of the wire is prolonged, water drops on the outer wall of the wire are absorbed through the artificial sponge 13, the artificial sponge 13 discharges the absorbed water through the through holes, granular plastic cement adhered on the outer wall of the wire is scraped through the artificial sponge 13, the surface of the wire is cleaner, the wax block 14 is arranged at the other end of the artificial sponge 13, the wax block 14 is contacted with the outer wall of the wire through the elasticity of the second spring 25, and a layer of wax film is plated on the outer wall of the wire, the wire passes through the first hollow column 3, the controller 6 controls the motor to drive the third gear 10 to rotate, the third gear 10 drives the second gear 9 to rotate, the second gear 9 drives the first gear 8 to rotate, so as to drive the first roller 2 to rotate along the two first limiting plates 5, the first roller 2 drives the first hollow column 3 to rotate due to the fact that the lug 7 on the first hollow column 3 is connected in the second groove on the first roller 2 in a sliding mode, five groups of sensing units 4 are installed on the inner wall of the first hollow column 3, the sensing head 41 of each sensing unit 4 is abutted against the outer wall of the wire, the bottom end of the sensing head 41 transmits pressure to the pressure sensor 43 through the first spring 42, the pressure sensor 43 transmits data to the controller 6, the pressure value on the display screen is between 0.7N and 1.2N, and if the plastic insulator 18 is damaged, the pressure of the sensing head 41 is reduced, until one of the pressure sensors 43 fluctuates beyond the range, the outer wall of the lead is judged to be damaged, and if the outer wall of the lead is not damaged, the outer wall of the lead is insulated; the positions of each group of mounting grooves are staggered, so that the outer wall of the lead can be detected, the top end of the induction head 41 is blunted, the surface plastic insulator 18 of the lead is prevented from being scratched, friction with the plastic insulator 18 is reduced, and if the induction unit 4 on the inner wall of the first hollow column 3 is damaged, the lug 7 can sequentially slide out along the second groove and the first groove, so that the first hollow column 3 is driven to slide out along the first roller 2, and the damaged induction unit 4 is replaced; the granular plastic adhered to the outer wall of the lead is scraped in advance through the artificial sponge 13, so that the detection accuracy of the induction unit 4 is improved; if one of the sensing units 4 is damaged, the other sensing units 4 can still detect the plastic insulator 18 of the lead, and when the lead plated with the wax film is in contact with the sensing head 41 on the sensing unit 4, the friction force between the lead plated with the wax film and the sensing head 41 is reduced, and the service life of the sensing head 41 is prolonged.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A production process of a fireproof flexible cable is characterized by comprising the following steps: the production process comprises the following steps:
s1: wrapping the electric wire with glue: firstly, a single bare copper wire (17) is twisted into a strand through a stranding machine after being detected to be defect-free through a machine, then the strand is wrapped with a layer of plastic insulator (18) to be made into a lead through an extruder, and then the lead is cooled through a cold water pool;
s2: insulation detection, namely passing the lead in S1 through five groups of induction units (4) arranged on the inner wall of a first hollow column (3) on an insulation detection device, wherein an induction head (41) of each induction unit (4) is abutted against the outer wall of the lead, and the outer wall of the lead is judged to be damaged through pressure change on a pressure sensor (43), so that the outer wall of the lead is judged to be uninsulated;
s3: manufacturing a wire core: wrapping an aluminized polyester sheath (19) on the outer wall of the wire by a machine, wrapping a mica tape (20) on the periphery of the aluminized polyester sheath (19), and wrapping a ceramic silicon rubber (21) on the outer surface of the mica tape (20) by an extruder to prepare a wire core;
s4: filling with a filler (22): the cable core is orderly arranged, then a filler (22) is added, and then the cable core is wrapped by a wrapping tape (24), wherein the filler (22) is prepared from the following raw materials in percentage by weight: perlite powder: magnesium oxide: binder 15: 30: 1;
s5: interlocking and armoring: installing a layer of armor layer (23) on the outer surface of the wrapped wrapping tape (24) in S2, wherein the armor layer (23) is made of aluminum alloy;
s6: and (3) extrusion molding: wrapping a layer of ceramic silicon rubber (21) outside the armor layer (23) by an extruder to prepare a cable;
the insulation detection device in the S2 comprises a base (1), a first roller (2), a first hollow column (3), an induction unit (4), a first limiting plate (5) and a controller (6); the base (1) is fixedly connected with two first limiting plates (5), a through hole is formed in the center of each first limiting plate (5), the cross section of each first limiting plate (5) is L-shaped, a first groove is formed in the upper portion and the lower portion of the end face of one first limiting plate (5), a first roller (2) is rotatably connected between the two first limiting plates (5), second grooves are formed in the upper portion and the lower portion of the end face of the first roller (2), and the specification of each first groove is consistent with that of each second groove; sliding connection is hollow post (3) No. one on the inner wall of cylinder (2), the upper portion and the lower part of the one end of hollow post (3) have linked firmly lug (7), every lug (7) all can slide along a corresponding recess, every equal sliding connection of lug (7) is in No. two recesses, be equipped with five groups of mounting grooves on the inside wall of hollow post (3), a set of the mounting groove is eight at least, every group the position of mounting groove all staggers the setting, every all install induction element (4) in the mounting groove, induction element (4) are including inductive head (41), spring (42), pressure sensor (43), the structure of inductive head (41) is the taper shape, the top of inductive head (41) is blunted, a spring (42) is connected to the bottom of inductive head (41), the other end of the first spring (42) is connected with a pressure sensor (43), and the pressure sensor (43) is attached to the inner wall of the first roller (2); the controller (6) is used for controlling the automatic operation of the insulation detection device.
2. The process for producing a fireproof flexible cable according to claim 1, wherein: the motor is arranged on the base (1), the motor is connected with a third gear (10) in a key mode, the third gear (10) is meshed with a second gear (9), a first gear (8) is arranged on the outer wall of the first roller (2), and the first gear (8) is meshed with the second gear (9).
3. The process for producing a fireproof flexible cable according to claim 2, wherein: no. two limiting plates (11), every have been linked firmly on base (1) the center department of No. two limiting plates (11) is provided with the through-hole, two rotate between No. two limiting plates (11) and connect No. two cylinder (12), the below of the one end of No. two cylinder (12) is equipped with the through hole, be stained with artificial sponge (13) on the inner wall of No. two cylinder (12).
4. A process for manufacturing a fire-resistant flexible cable according to claim 3, wherein: a group of concave cavities are formed in one end of an artificial sponge (13) on the inner wall of the second roller (12), the number of the concave cavities is at least four, the bottom of each concave cavity is connected with a second spring (25), and the other end of each second spring (25) is connected with a wax block (14).
5. The process for producing a fireproof flexible cable according to claim 4, wherein: a fourth gear (15) is arranged on the outer wall of the second roller (12), the fourth gear (15) is meshed with a fifth gear (16), and the fifth gear (16) is connected to the second gear (9) through a transmission rod.
6. A flexible fireproof cable is characterized in that: the flexible fireproof cable is suitable for the production process of any one of the fireproof flexible cables in the claims 1 to 5, and comprises a copper wire (17), a plastic insulator (18), a polyester sheath (19), a mica tape (20), ceramic silicon rubber (21), a filler (22), a wrapping tape (24) and an armor layer (23); the surface of the polyester sheath (19) is subjected to aluminizing treatment, the ceramic silicon rubber (21) comprises two parts, and the filler (22) comprises perlite powder, magnesium oxide and an adhesive.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010451352.4A CN111667955A (en) | 2020-05-25 | 2020-05-25 | Fireproof flexible cable production process and flexible fireproof cable produced by same |
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| CN202010451352.4A CN111667955A (en) | 2020-05-25 | 2020-05-25 | Fireproof flexible cable production process and flexible fireproof cable produced by same |
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| CN111667955A true CN111667955A (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114446543A (en) * | 2022-01-11 | 2022-05-06 | 韦伯斯特感应科技(常州)有限公司 | Production process of water-cooled cable and water-cooled cable |
-
2020
- 2020-05-25 CN CN202010451352.4A patent/CN111667955A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114446543A (en) * | 2022-01-11 | 2022-05-06 | 韦伯斯特感应科技(常州)有限公司 | Production process of water-cooled cable and water-cooled cable |
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Application publication date: 20200915 |