CN112768132A - Fireproof pressure-resistant rubber special-shaped cable and preparation process thereof - Google Patents
Fireproof pressure-resistant rubber special-shaped cable and preparation process thereof Download PDFInfo
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- CN112768132A CN112768132A CN202011637311.0A CN202011637311A CN112768132A CN 112768132 A CN112768132 A CN 112768132A CN 202011637311 A CN202011637311 A CN 202011637311A CN 112768132 A CN112768132 A CN 112768132A
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
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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
- H01B13/227—Pretreatment
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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
- H01B7/08—Flat or ribbon cables
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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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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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
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
- H01B7/423—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation using a cooling fluid
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Abstract
The invention discloses a fireproof pressure-resistant rubber special-shaped cable and a preparation process thereof, wherein the fireproof pressure-resistant rubber special-shaped cable has good fireproof flame retardant property and extrusion resistance, and is high in forming quality in the preparation process.
Description
Technical Field
The invention belongs to the technical field of cables, and particularly relates to a fireproof pressure-resistant rubber special-shaped cable and a preparation process thereof.
Background
Cables are generally transmission lines for transmitting electric energy, electric signals, and the like, and in the present life, the cables are an indispensable part for information transmission. At present, when the cable is used, a plurality of severe environments exist, and the cable is easy to be damaged in the severe environments, so that the cable in the severe environments needs to be maintained frequently, the cost is extremely high, particularly in high-temperature environments, the insulativity, the fire resistance and the high-temperature resistance of the cable are the most basic conditions of the cable, and at present, a fire disaster is also a common disaster, and in the disaster process, the electric protection is set to a very large degree to transmit signals and electric energy by the cable to work, so that the fireproof performance of the cable is very important for the current production and life.
The existing flame-retardant cable has a single flame-retardant mode, the flame-retardant mode is usually a mode of directly adopting a flame-retardant rubber sleeve or a mode of coating a flame-retardant coating, and a mode of spraying flame-retardant powder on the surface of a rubber layer to form a flame-retardant layer is also adopted, but the existing coating mode and spraying mode do not have applicable special equipment, and the traditional equipment or modes such as spraying, dip-dyeing and spray guns have defects and can affect the forming quality, so the improvement is needed; in addition, the conventional flame-retardant cable necessarily comprises a plurality of wires, and adjacent wires are mainly shaped and separated by fillers such as cords, but the conventional flame-retardant cable is poor in stability, insufficient in extrusion resistance and poor in thermal conductivity.
Disclosure of Invention
The invention aims to provide a fireproof pressure-resistant rubber special-shaped cable and a preparation process thereof, wherein the fireproof pressure-resistant rubber special-shaped cable has good fireproof flame retardant property and extrusion resistance, and the forming quality is high in the preparation process.
The purpose of the invention is realized as follows: the utility model provides a withstand voltage rubber dysmorphism cable of fire prevention, includes the oversheath and arranges a plurality of wires in the oversheath in, the wire includes sinle silk and the insulating layer of cladding on the sinle silk outer wall, its characterized in that: the flexible framework with the flat structure is arranged in the outer sheath, the wires are distributed in a horizontal equidistant mode and are embedded in the flexible framework, the flame-retardant sleeve is further arranged between the outer sheath and the flexible framework, and the flame-retardant filling layer is further arranged between the flame-retardant sleeve and the outer sheath.
The invention is further configured to: the material of flexible skeleton is micropore rubber, and flexible skeleton flooding has insulating oil, and winds on the flexible skeleton and has a thin layer, still winds on the outer wall of thin layer and has the mica tape.
The invention is further configured to: the flame-retardant filling layer comprises a flame-retardant coating and flame-retardant powder attached to the outer wall of the flame-retardant coating, the outer sheath is also of a flat structure, an extending part is arranged on the narrow edge of the outer sheath, and a brace is embedded in the extending part.
A preparation process of a fireproof pressure-resistant rubber special-shaped cable comprises the following steps:
s1, stranding the cable monofilaments to form a wire core, and extruding and injection-molding an insulating sleeve on the surface of the wire core to form a single wire;
s3, arranging and drawing a plurality of leads in parallel, and forming a flexible framework in an extrusion injection molding mode;
s4, dipping the flexible framework in insulating oil for treatment, winding a film on the flexible framework, and finally winding a mica tape;
s5, extruding and wrapping a flame-retardant sleeve on the surface of the mica tape;
s6, coating a flame-retardant coating on the surface of the flame-retardant sleeve by a liquid spraying device;
s7, spraying flame-retardant powder on the outer wall of the flame-retardant sleeve sprayed with the flame-retardant coating through a spraying device;
s8, and finally, injecting on the outer surface to form the outer sheath.
The invention is further configured to: the liquid spraying device comprises a liquid spraying box, a cable channel, a liquid storage cavity, a conveying pump and a liquid spraying mechanism are arranged in the liquid spraying box, the liquid spraying mechanism comprises an upper group of the liquid spraying mechanism and a lower group of the liquid spraying mechanism, the upper group of the liquid spraying mechanism and the lower group of the liquid spraying mechanism are respectively positioned at the upper side and the lower side of the cable channel, the input end of the conveying pump is communicated with the liquid storage cavity, the output end of the conveying pump is communicated with the liquid spraying mechanism, the liquid spraying mechanism comprises a main flow channel and a liquid outlet cavity, an adjusting component is arranged in the liquid outlet cavity and comprises an adjusting block, a positioning rod and a reset spring, a fixing plate is arranged on a cavity opening of the liquid outlet cavity, the positioning rod is fixed on the inner side surface of the fixing plate, the adjusting block is in sliding connection with the positioning rod, the reset spring is sleeved on the positioning rod, two ends of the reset spring are respectively abutted against the fixing, the first rear flow guide wall and the second rear flow guide wall are matched with each other to form a second liquid outlet.
The invention is further configured to: the front side of the liquid spraying device is provided with a tension adjusting device, the tension adjusting device comprises an upper adjusting seat and a lower adjusting seat which are respectively positioned at the upper side and the lower side of a cable conveying path, the upper adjusting seat comprises an upper base and an upper roller positioned in the upper base, the upper roller and the upper base are elastically connected in an up-and-down telescopic manner, the lower adjusting seat comprises a lower base and a tensioning assembly positioned in the lower base, the tensioning assembly comprises a bottom plate and a lower roller arranged on the bottom plate, the lower roller and the lower adjusting seat are also elastically connected in an up-and-down telescopic manner, a driving device for driving the tensioning assembly to ascend and descend is also arranged in the lower base, the driving device comprises a permanent magnet arranged at the bottom of the bottom plate and an electromagnet which is arranged in the lower base, the tension adjusting device also comprises a tension sensor, and the tension sensor is used for detecting the tension of the cable and feeding back a signal to the control unit;
the control unit also comprises a timing module and an alarm module, and the control method of the control unit comprises the following steps:
l1, presetting a minimum tension value Fmin and a maximum tension value Fmax, detecting a real-time tension value F of the cable by a tension sensor, and judging whether the F is between the minimum tension value Fmin and the maximum tension value Fmax;
l2, if F is smaller than Fmin, the control unit increases current to the electromagnet, the lower roller rises, the cable is tensioned, the timing module is started, and if F is continuously smaller than Fmin within the time of connecting X seconds, the alarm module gives an alarm;
l3, if F is larger than Fmax, the control unit reduces current to the electromagnet, the lower roller descends, the cable is loosened in a wire inlet mode, the timing module is started, and if F is continuously larger than Fmin within Y-second connection time, the alarm module gives an alarm;
l4, if Fmin is less than or equal to F and less than or equal to Fmax, the tension of the cable is in a normal state, and the tension adjusting device maintains the current state.
The invention is further configured to: the rear side of the liquid spraying device is provided with a spraying device, the spraying device comprises a rotary drum through which a cable passes and a servo motor used for driving the rotary drum to rotate, the servo motor is used for driving the rotary drum to rotate in a reciprocating mode within +/-30 degrees, a spraying area is arranged in the rotary drum, a plurality of spray guns which are annularly and equidistantly arranged are arranged in the spraying area, and each spray gun comprises a powder mixing area and a powder cyclone spraying area.
The invention is further configured to: the powder mixing area comprises an outer pipe sleeve, a first powder input pipe and a second powder input pipe, the outer pipe sleeve, the first powder input pipe sleeve and the second powder input pipe are sequentially sleeved from outside to inside, a first necking channel is arranged on the output end of the first powder input pipe, a second necking channel is arranged on the output end of the second powder input pipe, a third necking channel is arranged on the outer pipe sleeve, a mixing cavity located in the axial area of the first necking channel and the third necking channel is formed in the outer pipe sleeve, a mechanical thimble is further arranged in the powder mixing area, and the mechanical thimble is used for communicating the first necking channel and the third necking channel;
the powder rotational flow injection area comprises an air pipe, a rotational flow air chamber and an injection pipe which are sequentially communicated, a third necking channel is coaxially arranged in the air pipe, the air pipe is connected with an air inlet pipe which obliquely and axially blows towards the air pipe and is tangentially arranged with the air pipe, the rotational flow air chamber is of a conical structure, the small end of the rotational flow air chamber is connected with the air pipe, the large end of the rotational flow air chamber is connected with the injection pipe, the inner diameter of the injection pipe is smaller than that of the large end of the rotational flow air chamber but larger than that of the small end of the rotational flow air chamber, a flow dividing rod right opposite to the air pipe is further arranged in the injection pipe, a built-in heating wire is further arranged in the injection pipe, an expanding opening of the conical structure is further arranged at the pipe orifice of the injection pipe, an arc-shaped flow guide part right opposite to the air pipe is; the flow dividing rod is also provided with an installation rod arranged in the cyclone air chamber, and the end part of the installation rod is provided with a guide impeller which is right opposite to the third necking channel.
The invention is further configured to: baffles positioned at two sides of the spray gun are also arranged in the spray area, a rotating motor for driving the baffles at two sides to fold or open is also arranged in the rotating drum, and the air pipe is also connected with a rear exhaust pipe.
The invention is further configured to: the front end of the rotary drum is also provided with a temperature sensor, the temperature sensor is used for measuring the temperature of the surface of the cable and feeding back a corresponding signal to the control unit, the control unit is also used for controlling the current of the heating wire, the temperature sensor is used for detecting the flame-retardant coating, and the lower the temperature is detected, the higher the current of the heating wire is; the higher the temperature detected by the temperature sensor, the smaller the heater wire current.
By adopting the technical scheme, the cable adopts a double flame retardant mode, has good flame retardant performance, is used for improving the extrusion resistance of the cable through the arrangement of the flexible framework, and can adsorb insulating oil to achieve the effect of uniform heat dissipation;
in the preparation process, secondary liquid spraying is realized through a liquid spraying device, the liquid spraying thickness is improved, and compared with a single large-amount liquid spraying mode, the liquid hanging amount is more stable and uniform;
the liquid outlet pressure of the liquid spraying device is adjusted by arranging the adjusting assembly, so that the liquid spraying pressure is kept constant, and the coating uniformity is improved;
the tension adjusting device is adopted to carry out full-automatic adjustment on the tension of the cable during conveying, so that the cable is positioned in the liquid spraying device and can be tightened, the uniformity of up-and-down spraying is ensured, and the forming quality is improved;
the spray attachment device adopts a novel spray gun design, so that the spray attachment device can directly mix two different flame-retardant powders, has good mixing effect, can realize continuous and stable spraying through secondary mixing of a cyclone air chamber after premixing, has small pulsation, has small influence on a spraying surface layer and high forming quality.
Drawings
FIG. 1 is a schematic view of the construction of the cable of the present invention;
FIG. 2 is a schematic view showing the structure of a liquid ejecting apparatus according to the present invention;
FIG. 3 is an enlarged view of the structure of FIG. 2 at A in the present invention;
FIG. 4 is a schematic view of the construction of the tension adjusting apparatus according to the present invention;
FIG. 5 is a schematic axial sectional view of the drum of the present invention;
FIG. 6 is a schematic view of the radial cross-sectional configuration of the spray zone of the present invention;
FIG. 7 is a schematic view of the construction of the lance of the present invention;
FIG. 8 is a control logic diagram of the tension adjustment mechanism of the present invention;
the reference numbers in the figures are: 1. an outer sheath; 2. a wire core; 3. an insulating layer; 4. a flexible backbone; 5. a flame-retardant sleeve; 6. a flame retardant coating; 7. a flame retardant powder; 8. a thin film layer; 9. mica tapes; 10. an extension portion; 11. anti-bracing; 101. a liquid spraying tank; 102. a liquid storage cavity; 103. a delivery pump; 104. a main flow channel; 105. a liquid outlet cavity; 106. an adjusting block; 107. positioning a rod; 108. a return spring; 109. a fixing plate; 110. a first liquid outlet; 111. a second liquid outlet; 201. an upper base; 202. an upper roller; 203. a lower base; 204. a base plate; 205. a lower roller; 206. a permanent magnet; 207. an electromagnet; 208. a tension sensor; 301. a rotating drum; 302. a servo motor; 303. a spray zone; 304. an outer sleeve; 305. a first powder input tube; 306. a second powder input tube; 307. a first throat channel; 308. a second throat channel; 309. a third throat channel; 310. a mixing chamber; 311. a mechanical thimble; 312. an air duct; 313. a cyclone air chamber; 314. an injection pipe; 315. an air inlet pipe; 316. a diverter rod; 317. flaring; 318. an arc-shaped flow guide part; 319. a baffle plate; 320. an air exhaust pipe; 321. an electric heating wire; 322. a spray gun; 323. mounting a rod; 324. and guiding the impeller.
Detailed Description
The invention is further described in the following with specific embodiments in conjunction with the accompanying drawings, see fig. 1-8:
the utility model provides a withstand voltage rubber dysmorphism cable of fire prevention, includes oversheath 1 and arranges a plurality of wires in oversheath 1 in, the wire includes sinle silk 2 and the insulating layer 3 of cladding on 2 outer walls of sinle silk, its characterized in that: the flexible cable is characterized in that a flexible framework 4 of a flat structure is arranged in the outer sheath 1, the wires are arranged in a horizontal equidistant mode and are embedded in the flexible framework 4, a flame-retardant sleeve 5 is further arranged between the outer sheath 1 and the flexible framework 4, and a flame-retardant filling layer is further arranged between the flame-retardant sleeve 5 and the outer sheath 1.
The flexible framework 4 is used for improving the extrusion resistance of the cable, the flame retardance is improved through the flame-retardant sleeve 5, and a further flame-retardant and fireproof effect is achieved through the flame-retardant filling layer, wherein the flame-retardant sleeve 5 can be made of halogen-free flame-retardant silicon rubber.
The material of the flexible framework 4 is microporous rubber, the buffering performance of the flexible framework 4 is improved through a microporous structure, the flexible framework 4 is soaked with insulating oil, so that the insulating oil is adsorbed in micropores, the insulativity of the flexible framework 4 is improved, in addition, the insulating oil can adsorb certain heat, the heat absorption effect can be achieved, the problem of local temperature rise of the cable core 2 can be solved, the effect of uniformly dispersing the heat can be achieved, and the effective protection effect can be achieved on the cable core 2; and a film layer 8 is wound on the flexible framework 4, the film layer 8 can be a PET film, the arrangement of the film layer 8 can avoid the outward leakage of insulating oil in the subsequent cable processing process, a mica tape 9 is also wound on the outer wall of the film layer 8, the mica tape 9 has the effects of flame retardance and heat insulation, the flame retardance can be improved, and the cable can play a role in protecting the film layer 8 in the subsequent processing and forming process.
The flame-retardant filling layer comprises a flame-retardant coating 6 and flame-retardant powder 7 attached to the outer wall of the flame-retardant coating 6, the flame-retardant coating 6 can adopt the existing outsourcing fireproof flame-retardant coating, and the flame-retardant powder 7 is sprayed on the flame-retardant coating 6, so that multiple flame-retardant and fireproof effects are achieved; the outer sheath 1 is also of a flat structure, an extending portion 10 is arranged on the narrow edge of the outer sheath 1, the extending portion 10 can improve the structural strength of the narrow edge of the outer sheath 1, the extending portion 10 is embedded with an anti-pulling strip 11 for improving the tensile strength, and the anti-pulling strip 11 can be twisted fiber filaments.
A preparation process of a fireproof pressure-resistant rubber special-shaped cable comprises the following steps: the method comprises the following steps:
s1, stranding the cable monofilaments to form a wire core 2, and extruding and injection-molding an insulating sleeve on the surface of the wire core 2 to form a single wire;
s3, arranging and drawing a plurality of leads in parallel, and forming a flexible framework 4 in an extrusion injection molding mode;
s4, dipping the flexible framework 4 in insulating oil, winding a film on the flexible framework 4, and finally winding a mica tape 9;
s5, extruding and wrapping the flame-retardant sleeve 5 on the surface of the mica tape 9;
s6, coating a flame-retardant coating on the surface of the flame-retardant sleeve 5 through a liquid spraying device;
s7, spraying flame-retardant powder 7 on the outer wall of the flame-retardant sleeve 5 sprayed with the flame-retardant coating through a spraying device;
s8, and finally, injecting the mixture on the outer surface to form the outer sheath 1.
The incoming cable is sequentially molded through the steps, and the specific liquid spraying device and the specific spraying device are selected for processing in the molding process, so that the flame retardant effect is improved, and the quality of the cable is enhanced.
The liquid spraying device comprises a liquid spraying box 101, a cable channel, a liquid storage cavity 102, a delivery pump 103 and a liquid spraying mechanism are arranged in the liquid spraying box 101, the liquid spraying mechanism is divided into an upper group and a lower group and is respectively positioned at the upper side and the lower side of the cable channel, the input end of the delivery pump 103 is communicated with the liquid storage cavity 102, the output end of the delivery pump 103 is communicated with the liquid spraying mechanism, the liquid spraying mechanism comprises a main channel 104 and a liquid outlet cavity 105, an adjusting component is arranged in the liquid outlet cavity 105, the adjusting component comprises an adjusting block 106, a positioning rod 107 and a reset spring 108, a fixing plate 109 is arranged on the opening of the liquid outlet cavity 105, the positioning rod 107 is fixed on the inner side surface of the fixing plate 109, the adjusting block 106 is in sliding connection with the positioning rod 107, the reset spring 108 is sleeved on the positioning rod 107, two ends of the reset spring 108 are respectively abutted against the fixing plate 109 and the adjusting block 106, a first, the first front guide wall and the second front guide wall cooperate to form a first liquid outlet 110, and the first rear guide wall and the second rear guide wall cooperate to form a second liquid outlet 111.
The traditional flame retardant coating mode is generally a dip dyeing type and a spray type, but the dip dyeing type is difficult to control the coating amount, and the spray type adopts a spray head to spray, and the spray type is pumped by a delivery pump 103, but the delivery pump 103 has the problem of output pressure fluctuation, so that the coating thickness and uniformity have differences; the invention controls the conveying pressure by arranging the adjusting component, and the adjusting principle is as follows: when delivery pump 103 pressure increases, regulating block 106 moves outward, thereby first liquid outlet 110, the bore of second liquid outlet 111 can increase, to the area increase that covers of spouting of fire-retardant cover 5, improve the homogeneity, when delivery pump 103 pressure reduces, regulating block 106 moves inwards, first liquid outlet 110, the bore of second liquid outlet 111 can reduce, to the area reduction that covers of spouting of fire-retardant cover 5, but can keep hydrojet pressure invariable, improve the homogeneity of coating, and first liquid outlet 110 and second liquid outlet 111 set up for the front and back, can carry out double-deck hydrojet to the cable surface, the mode that adopts the secondary hydrojet improves hydrojet thickness, and compare the mode of a large amount of hydrojets of single, this mode liquid hanging volume is more stable even.
The front side of the liquid spraying device is provided with a tension adjusting device, the tension adjusting device comprises an upper adjusting seat and a lower adjusting seat which are respectively positioned at the upper side and the lower side of a cable conveying path, the upper adjusting seat comprises an upper base 201 and an upper roller 202 positioned in the upper base 201, the upper roller 202 and the upper base 201 are elastically connected in a vertically telescopic manner, the lower adjusting seat comprises a lower base 203 and a tensioning assembly positioned in the lower base 203, the tensioning assembly comprises a bottom plate 204 and a lower roller 205 arranged on the bottom plate 204, the lower roller 205 and the lower adjusting seat are also elastically connected in a vertically telescopic manner, a driving device for driving the tensioning assembly to ascend and descend is also arranged in the lower base 203, the driving device comprises a permanent magnet 206 arranged at the bottom of the bottom plate 204, an electromagnet 207 which is arranged in the lower base 203 and is opposite to the permanent magnet 206 and has mutually exclusive magnetic poles, and a control, the tension adjustment device further comprises a tension sensor 208, the tension sensor 208 being adapted to detect the tension of the cable and to feed back a signal to the control unit.
In the production and conveying process of the cable, the tension can be changed, if the tension is too small, the cable can be bent to a certain degree, so that after the flame-retardant coating is sprayed, the thickness of the flame-retardant coating on two sides can be different, and the cable can be damaged due to too large tension, so that the tension of the cable can be kept constant through the tension adjusting device; the upper roller 202 is connected with the upper base 201 in a concrete connection mode and comprises an upper connecting support and an upper spring, the upper connecting support is connected with two ends of the upper roller 202, the top of the upper connecting support penetrates through the upper base 201 and can slide relatively, the top of the upper connecting support is also connected with an outer limiting plate positioned outside the upper base 201, the upper connecting support is also provided with an inner limiting plate positioned in the upper base 201, the inner limiting plate can slide up and down relative to the upper base 201, the upper spring is sleeved on the upper connecting support, and two ends of the upper spring are respectively abutted against the inner wall of the upper base 201 and the limiting plate, so that elastic reset is realized; lower gyro wheel 205 is connected with lower linking bridge and lower spring, lower linking bridge and bottom plate 204 fixed connection, and bottom plate 204 can slide from top to bottom in lower base 203, still is equipped with down the limiting plate on the lower linking bridge, and in lower limiting plate was fixed in lower base 203, lower linking bridge can slide from top to bottom relatively the limiting plate down, and lower spring overlaps on lower linking bridge, and the spring both ends are contradicted in bottom plate 204 and lower limiting plate respectively down.
The control unit also comprises a timing module and an alarm module, and the control method of the control unit comprises the following steps:
l1, presetting a minimum tension value Fmin and a maximum tension value Fmax, detecting a real-time tension value F of the cable by a tension sensor 208, and judging whether the F is between the minimum tension value Fmin and the maximum tension value Fmax;
l2, if F is less than Fmin, the control unit increases current to the electromagnet 207, the lower roller 205 rises, the cable is tensioned, the timing module is started, if the F is continuously less than Fmin within the time of connecting X seconds, the alarm module gives an alarm, if the time of continuously less than Fmin does not exceed X seconds, the timing module is cleared, and the timing module is convenient to re-time when the next F is less than Fmin;
l3, if F is larger than Fmax, the control unit reduces current to the electromagnet 207, the lower roller 205 descends, the cable is loosened, the timing module is started, if the F is continuously larger than Fmin within Y seconds of connection, the alarm module gives an alarm, if the F is continuously larger than Fmin and does not exceed Y seconds, the timing module is cleared, and the timing module is convenient to re-time when the F is larger than Fmin next time;
l4, if Fmin is not less than F and not more than Fmax, the tension of the cable is in a normal state, and the tension adjusting device can maintain the current state;
by the control method, automatic control and adjustment are realized, the precision is high, the duration time of the abnormal state is controlled, if the duration time is too long, the abnormal state is indicated to exceed the adjustment range of the tension adjusting device, so that an alarm is required to warn, and subsequent manual adjustment or traction speed adjustment of the tractor is facilitated.
In actual use, the spraying time of the spraying device can be when the flame-retardant coating is just sprayed and is still in a liquid state; or after drying, in a semi-cured state; or a fully cured state; wherein the semi-curing state has the best effect; because the flame-retardant powder 7 is sprayed and attached in a completely uncured state, the flame-retardant coating is easily blown by airflow and drips, and the quality of the flame-retardant coating 6 is affected; after the curing, the flame retardant powder 7 is sprayed, and the flame retardant powder 7 needs to be heated to a higher temperature, so that the flame retardant powder 7 can be adhered to the flame retardant coating 6, which results in insufficient energy saving and insufficient spraying quality.
The rear side of the liquid spraying device is provided with a spraying device, the spraying device comprises a rotary drum 301 for a cable to pass through and a servo motor 302 for driving the rotary drum 301 to rotate, a spraying area 303 is arranged in the rotary drum 301, a plurality of spray guns 322 which are annularly arranged at equal intervals are arranged in the spraying area 303, and each spray gun 322 comprises a powder mixing area and a powder cyclone spraying area.
The spraying device needs to be installed on a support, which is not shown in the figure, the servo motor 302 and the rotary drum 301 can be driven in a gear transmission mode, the servo motor 302 is used for driving the rotary drum 301 to rotate in a reciprocating mode within +/-30 degrees, six groups of spray guns 322 can be used for spraying the peripheral sides of cables simultaneously, the spraying uniformity is good, the spraying effect can be improved in the reciprocating rotation mode, and pipelines connected with the spray guns 322 cannot be pulled and separated due to the influence of rotation; the powder mixing area is mainly used for mixing different flame-retardant powders 7, and the powder rotational flow spraying area is mainly used for spraying the mixed flame-retardant powders 7 in a rotational flow mode, so that the direct impact of air flow on the flame-retardant coating is reduced.
The powder mixing area comprises an outer sleeve, a first powder input pipe 305 and a second powder input pipe 306, the outer sleeve, the first powder input pipe 305 and the second powder input pipe 306 are sequentially sleeved from outside to inside, a first necking channel 307 is arranged on the output end of the first powder input pipe 305, a second necking channel 308 is arranged on the output end of the second powder input pipe 306, a third necking channel 309 is arranged on the outer sleeve, a mixing cavity 310 located in the axial area of the first necking channel 307 and the third necking channel 309 is formed in the outer sleeve, a mechanical ejector pin 311 is further arranged in the powder mixing area, and the mechanical ejector pin 311 is used for communicating the first necking channel 307 and the third necking channel 309.
In order to improve the flame retardance, two flame retardant powders 7 are mixed and sprayed, for example, magnesium oxide powder and calcium chloride powder are adopted, the magnesium oxide powder airflow can be introduced from a first powder input pipe 305 in a sleeved mode, the calcium chloride powder airflow can be introduced from a second powder input pipe 306 in a sleeved mode, due to the arrangement of a first necking passage 307 and a second necking passage 308, accelerated airflow can be generated during airflow, the two airflows cannot simultaneously and completely pass through a third necking passage 309, and inevitably collide with each other in a mixing cavity 310 to be premixed, and then enter an air pipe 312 through the third necking passage 309; therefore, the powder mixing area is convenient for adding two different flame retardant powders 7 and the aim of premixing is achieved; in addition, the area of the outer sleeve surrounding the first powder input pipe 305 may be a closed structure and is not communicated with the mixing chamber 310, and in practical use, a heat medium may be introduced to preheat the first powder input pipe 305 and the second powder input pipe 306, that is, preheat the powder; the mechanical thimble 311 mainly includes a thimble and a return spring 108, and is controlled in a pneumatic manner, during ventilation, the return spring 108 is compressed, the thimble moves forward, during exhaust, the return spring 108 returns, the thimble moves backward, and the first throat channel 307 and the third throat channel 309 are communicated in a timed ventilation and exhaust manner, so that powder is prevented from being dredged and blocked in the first throat channel 307 or the third throat channel 309.
The powder cyclone injection area comprises an air pipe 312, a cyclone air chamber 313 and an injection pipe 314 which are sequentially communicated, the third necking channel 309 is coaxially arranged in the air pipe 312, the air pipe 312 is connected with an air inlet pipe 315 which obliquely and axially blows to the air pipe 312 and is tangentially arranged with the air pipe 312, the cyclone air chamber 313 is in a conical structure, the small end of the swirling air chamber 313 is connected with an air pipe 312, the large end of the swirling air chamber 313 is connected with an injection pipe 314, the inner diameter of the injection pipe 314 is smaller than the inner diameter of the large end of the swirling air chamber 313 but larger than the inner diameter of the small end of the swirling air chamber 313, a shunt rod 316 opposite to the air pipe 312 is arranged in the injection pipe 314, a built-in heating wire is arranged in the injection pipe 314, a flaring 317 with a conical structure is arranged at the pipe orifice of the injection pipe 314, an arc-shaped flow guide part 318 opposite to the air pipe 312 is arranged at the inner end of the shunt rod 316, the arc-shaped flow guide part 318 extends into the cyclone air chamber 313, and the outer end of the flow dividing rod 316 is provided with a conical flow guide part corresponding to the flaring 317; the flow dividing rod 316 is also provided with a mounting rod 323 arranged in the swirl air chamber 313, and the end part of the mounting rod 323 is provided with a guide impeller 324 opposite to the third necking channel 309.
Due to the structural arrangement of the air inlet pipe 315, when the air inlet pipe 315 is used for air inlet, a rotating airflow is generated, after the powder airflow enters the air pipe 312 from the third necking channel 309, the powder airflow flows along with the rotating airflow, and the two kinds of powder are subjected to secondary disturbance mixing in the flowing process, so that the two kinds of powder are more uniform; through the arrangement of the cyclone air chamber 313, after the rotating air flow enters, the rotating air flow can continue to swirl, and along with the increase of the space, the rotating air flow can play a further role in mixing and diluting the powder air flow, so that the mixing uniformity is improved, and the high-concentration air flow powder can be prevented from directly jetting the flame-retardant coating layer; when the rotating airflow swirls in the swirling air chamber 313, part of powder is sprayed out of the spraying pipe 314 along with the airflow, and part of powder is blocked by the inner end surface of the spraying pipe 314 to fall back, but rises again along with the rotating airflow, and is continuously mixed and disturbed in the swirling air chamber 313, so that the mixing uniformity is improved; the function of the diversion rod 316 is mainly two, on one hand, the powder airflow in the third necking channel 309 is prevented from directly flowing to the injection pipe 314, and on the other hand, the diversion rod plays a role in guiding the airflow in the swirling flow air chamber 313 to enter the injection pipe 314; the flaring 317 at the pipe orifice of the injection pipe 314 and the conical flow guide part of the flow dividing rod 316 are arranged, so that the injected powder airflow is further decompressed, and the powder airflow is prevented from directly damaging the flame-retardant coating layer; if necessary, the heating wire serves to heat the powder air flow, so that the flame-retardant powder 7 and the flame-retardant coating 6 can be better combined together.
The mounting rod 323 is fixed on the flow dividing rod 316, the guide impeller 324 is rotatably mounted on the mounting rod 323, when the air pipe or the third necking channel blows air into the cyclone air chamber, the guide impeller 324 rotates, and the air flow generated in the third necking channel rotates and expands towards the peripheral side in the rotating process, so that the powder in the air flow further moves and disperses in the radial direction and is mixed with the rotating air flow in the cyclone air chamber 313, the mixing uniformity is improved, and the powder air flow in the third necking channel 309 can be further prevented from directly flowing to the injection pipe 314.
The spraying area 303 can be formed by separating partition plates at two sides, a rotating motor is arranged at the inner side of the rotary drum 301 and positioned at the outer side of the partition plates, one end of a baffle 319 is arranged on the partition plates through a rotating shaft, and the rotating shaft and the rotating motor are in gear transmission; in a conventional state, the bottom end of the partition plate needs to be connected with a dust collecting pipe to collect powder in the spraying and attaching process, but after the spraying and attaching device is used, part of flame-retardant powder 7 is adhered to the inner wall of the spraying and attaching area 303 and is difficult to clean, and if the flame-retardant powder 7 is not cleaned, the adhered flame-retardant powder 7 is blown up again by air flow generated by the spray gun 322 when the spraying and attaching device is used next time, so that the forming quality of the next batch of cables is influenced, and therefore, the effect of a single dust collecting pipe is limited; through the setting of baffle 319, the powder can the adhesion on baffle 319, and after a batch cable shaping, the rotating electrical machines can drive the baffle 319 of both sides and fold, and exhaust tube 320 begins to bleed simultaneously, and along with folding of baffle 319, the clearance between the baffle 319 reduces gradually, and exhaust tube 320 causes the air current between the baffle 319 can accelerate speed gradually, and high-speed air current can play the cleaning effect to the powder of adhesion, consequently plays the effect of exempting from to tear open easily and clear up.
The front end of the rotating drum 301 is further provided with a temperature sensor, the temperature sensor is used for measuring the temperature of the surface of the cable and feeding corresponding signals back to the control unit, the control unit is further used for controlling the current of the heating wire, the temperature sensor is used for detecting the flame-retardant coating 6, and the lower the detected temperature is, the higher the current of the heating wire is; the higher the temperature detected by the temperature sensor, the smaller the heater wire current.
In the cable preparation process, after the flame-retardant coating is coated, in order to semi-cure the flame-retardant coating, cooling drying is usually required, and heating drying or normal-temperature drying and other modes are adopted, so that when the cable enters the rotary drum 301, the surface temperature value can change, and for better adjustment, the cable is electrified and heated by a heating wire, and the heating temperature is 60-80 ℃; that is, when the temperature of the flame retardant coating 6 is high, the temperature of the flame retardant powder 7 can be reduced, and a good adhesion effect can be achieved, and when the temperature of the flame retardant coating 6 is low, the temperature of the flame retardant powder 7 needs to be increased, so that an optimal adhesion effect can be achieved, and thus dynamic balance can be formed, and the molding quality can be improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a withstand voltage rubber dysmorphism cable of fire prevention, includes oversheath (1) and arranges a plurality of wires in oversheath (1) in, the wire includes sinle silk (2) and insulating layer (3) of cladding on sinle silk (2) outer wall, its characterized in that: be equipped with flexible skeleton (4) of flat structure in oversheath (1), the wire is horizontal equidistance and arranges and inlay in flexible skeleton (4), still is equipped with fire-retardant cover (5) between oversheath (1) and flexible skeleton (4), still is equipped with fire-retardant filling layer between fire-retardant cover (5) and oversheath (1).
2. The special-shaped fireproof pressure-resistant rubber cable as claimed in claim 1, wherein the special-shaped fireproof pressure-resistant rubber cable comprises: the material of flexible skeleton (4) is micropore rubber, and flexible skeleton (4) flooding has insulating oil, and has a thin layer (8) around the package on flexible skeleton (4), still has mica tape (9) around the package on the outer wall of thin layer (8).
3. The special-shaped fireproof pressure-resistant rubber cable as claimed in claim 2, wherein the special-shaped fireproof pressure-resistant rubber cable comprises: the flame-retardant filling layer comprises a flame-retardant coating (6) and flame-retardant powder (7) attached to the outer wall of the flame-retardant coating (6), the outer sheath (1) is also of a flat structure, an extension part (10) is arranged on the narrow edge of the outer sheath (1), and an anti-bracing strip (11) is embedded in the extension part (10).
4. A preparation process of the fireproof pressure-resistant rubber special-shaped cable applicable to any one of claims 1 to 3 comprises the following steps: the method comprises the following steps:
s1, stranding the cable monofilaments to form a wire core (2), and extruding and injection-molding an insulating sleeve on the surface of the wire core (2) to form a single wire;
s3, arranging and drawing a plurality of wires in parallel, and forming a flexible framework (4) in an extrusion injection molding mode;
s4, dipping the flexible framework (4) in insulating oil, winding a film on the flexible framework (4), and finally winding a mica tape (9);
s5, extruding and wrapping a flame-retardant sleeve (5) on the surface of the mica tape (9);
s6, coating a flame-retardant coating on the surface of the flame-retardant sleeve (5) through a liquid spraying device;
s7, spraying flame-retardant powder (7) on the outer wall of the flame-retardant sleeve (5) sprayed with the flame-retardant coating through a spraying device;
s8, and finally, injecting the mixture on the outer surface to form the outer sheath (1).
5. The preparation process of the fireproof pressure-resistant rubber special-shaped cable according to claim 4, characterized in that: the liquid spraying device comprises a liquid spraying box (101), a cable channel, a liquid storage cavity (102), a conveying pump (103) and a liquid spraying mechanism are arranged in the liquid spraying box (101), the liquid spraying mechanism is divided into an upper group and a lower group which are respectively positioned at the upper side and the lower side of the cable channel, the input end of the conveying pump (103) is communicated with the liquid storage cavity (102), the output end of the conveying pump (103) is communicated with the liquid spraying mechanism, the liquid spraying mechanism comprises a main channel (104) and a liquid outlet cavity (105), an adjusting assembly is arranged in the liquid outlet cavity (105), the adjusting assembly comprises an adjusting block (106), a positioning rod (107) and a reset spring (108), a fixing plate (109) is arranged on a cavity opening of the liquid outlet cavity (105), the positioning rod (107) is fixed on the inner side surface of the fixing plate (109), the adjusting block (106) is slidably connected with the positioning rod (107), the reset spring (108) is sleeved on the positioning rod (107), and two ends of, a first front flow guide wall and a first rear flow guide wall are further arranged in the liquid outlet cavity (105), a second front flow guide wall and a second rear flow guide wall are arranged on the adjusting block (106), the first front flow guide wall and the second front flow guide wall are matched with each other and form a first liquid outlet (110), and the first rear flow guide wall and the second rear flow guide wall are matched with each other and form a second liquid outlet (111).
6. The preparation process of the fireproof pressure-resistant rubber special-shaped cable according to claim 5, characterized in that: the front side of the liquid spraying device is provided with a tension adjusting device, the tension adjusting device comprises an upper adjusting seat and a lower adjusting seat which are respectively positioned at the upper side and the lower side of a cable conveying path, the upper adjusting seat comprises an upper base (201) and an upper roller (202) positioned in the upper base (201), the upper roller (202) is elastically connected with the upper base (201) in a vertically telescopic manner, the lower adjusting seat comprises a lower base (203) and a tensioning assembly positioned in the lower base (203), the tensioning assembly comprises a bottom plate (204) and a lower roller (205) arranged on the bottom plate (204), the lower roller (205) is elastically connected with the lower adjusting seat in a vertically telescopic manner, a driving device for driving the tensioning assembly to ascend and descend is further arranged in the lower base (203), the driving device comprises a permanent magnet (206) arranged at the bottom of the bottom plate (204), an electromagnet (207) which is arranged in the lower base (203) and is opposite to the permanent magnet (206) and has a magnetic pole, The tension adjusting device also comprises a tension sensor (208), and the tension sensor (208) is used for detecting the tension of the cable and feeding back a signal to the control unit;
the control unit also comprises a timing module and an alarm module, and the control method of the control unit comprises the following steps:
l1, presetting a lowest tension value Fmin and a highest tension value Fmax, detecting a real-time tension value F of the cable by a tension sensor (208), and judging whether the F is between the lowest tension value Fmin and the highest tension value Fmax;
l2, if F is less than Fmin, the control unit increases current to the electromagnet (207), the lower roller (205) rises, the cable is tensioned, the timing module is started, and if F is less than Fmin continuously within the time of connecting X seconds, the alarm module gives an alarm;
l3, if F is larger than Fmax, the control unit reduces current to the electromagnet (207), the lower roller (205) descends, the cable inlet wire is loosened, the timing module is started, and if F is continuously larger than Fmin within Y-second connection time, the alarm module gives an alarm;
l4, if Fmin is less than or equal to F and less than or equal to Fmax, the tension of the cable is in a normal state, and the tension adjusting device maintains the current state.
7. The preparation process of the fireproof pressure-resistant rubber special-shaped cable according to claim 6, characterized in that: the rear side of the liquid spraying device is provided with a spraying device, the spraying device comprises a rotary drum (301) through which a cable passes and a servo motor (302) used for driving the rotary drum (301) to rotate, the servo motor (302) is used for driving the rotary drum (301) to rotate in a reciprocating mode within +/-30 degrees, a spraying area (303) is arranged in the rotary drum (301), a plurality of spray guns (322) which are annularly and equidistantly arranged are arranged in the spraying area (303), and each spray gun (322) comprises a powder mixing area and a powder rotational flow spraying area.
8. The preparation process of the fireproof pressure-resistant rubber special-shaped cable according to claim 7, characterized in that: the powder mixing area comprises an outer sleeve, a first powder input pipe (305) and a second powder input pipe (306), the outer sleeve, the first powder input pipe (305) sleeve and the second powder input pipe (306) are sequentially sleeved from outside to inside, a first necking channel (307) is arranged at the output end of the first powder input pipe (305), a second necking channel (308) is arranged at the output end of the second powder input pipe (306), a third necking channel (309) is arranged on the outer sleeve, a mixing cavity (310) located in the axial area of the first necking channel (307) and the third necking channel (309) is formed in the outer sleeve, a mechanical ejector pin (311) is further arranged in the powder mixing area, and the mechanical ejector pin (311) is used for conveying the first necking channel (307) and the third necking channel (309);
the powder rotational flow injection area comprises an air pipe (312), a rotational flow air chamber (313) and an injection pipe (314) which are sequentially communicated, a third necking channel (309) is coaxially arranged in the air pipe (312), the air pipe (312) is connected with an air inlet pipe (315) which is obliquely and axially blown to the air pipe (312) and is tangentially arranged with the air pipe (312), the rotational flow air chamber (313) is of a conical structure, the small end of the rotational flow air chamber (313) is connected with the air pipe (312), the large end of the rotational flow air chamber (313) is connected with the injection pipe (314), the inner diameter of the injection pipe (314) is smaller than the inner diameter of the large end of the rotational flow air chamber (313) but larger than the inner diameter of the small end of the rotational flow air chamber (313), a flow dividing rod (316) which is right opposite to the air pipe (312) is also arranged in the injection pipe (314), a built-in heating wire is also arranged in the injection pipe (314), the inner end of the shunt rod (316) is provided with an arc-shaped flow guide part (318) which is opposite to the air pipe (312), the arc-shaped flow guide part (318) extends into the cyclone air chamber (313), and the outer end of the shunt rod (316) is provided with a conical flow guide part corresponding to the flaring opening (317); the flow dividing rod (316) is also provided with an installation rod (323) arranged in the cyclone wind chamber (313), and the end part of the installation rod (323) is provided with a guide impeller (324) which is opposite to the third necking channel (309).
9. The preparation process of the fireproof pressure-resistant rubber special-shaped cable according to claim 8, characterized in that: baffles (319) positioned at two sides of the spray gun (322) are also arranged in the spray area (303), a rotating motor for driving the baffles (319) at two sides to close or open is also arranged in the rotating drum (301), and the air pipe (312) is also connected with a rear exhaust pipe (320).
10. The preparation process of the fireproof pressure-resistant rubber special-shaped cable according to claim 9, characterized in that: the front end of the rotary drum (301) is also provided with a temperature sensor, the temperature sensor is used for measuring the temperature of the surface of the cable and feeding back a corresponding signal to the control unit, the control unit is also used for controlling the current of the heating wire, the temperature sensor is used for detecting the flame-retardant coating (6), and the lower the detected temperature is, the higher the current of the heating wire is; the higher the temperature detected by the temperature sensor, the smaller the heater wire current.
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| CN211719313U (en) * | 2020-05-23 | 2020-10-20 | 青岛海能特种电缆有限公司 | Mineral cable of resistance to pressure |
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| CN2701033Y (en) * | 2004-05-18 | 2005-05-18 | 李明斌 | Multiple insulation high temperature and high voltage electric cable |
| CN103474140A (en) * | 2013-09-13 | 2013-12-25 | 江苏远洋东泽电缆股份有限公司 | Vessel shielding degaussing flat cable and manufacturing method thereof |
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Denomination of invention: A kind of fire-resistant and pressure-resistant rubber special-shaped cable and preparation process thereof Effective date of registration: 20220912 Granted publication date: 20210824 Pledgee: Agricultural Bank of China (Limited by Share Ltd.) branch of Lin Hai City Pledgor: Mingpin Cable Group Co.,Ltd. Registration number: Y2022330002075 |
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