CN111292905B - Production equipment and production method for composite smooth aluminum sleeve cable sheath - Google Patents
Production equipment and production method for composite smooth aluminum sleeve cable sheath Download PDFInfo
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- CN111292905B CN111292905B CN202010226480.9A CN202010226480A CN111292905B CN 111292905 B CN111292905 B CN 111292905B CN 202010226480 A CN202010226480 A CN 202010226480A CN 111292905 B CN111292905 B CN 111292905B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
- B23K9/1675—Arc welding or cutting making use of shielding gas and of a non-consumable electrode making use of several electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/06—Rod-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/154—Coating solid articles, i.e. non-hollow articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
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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
- H01B7/187—Sheaths comprising extruded non-metallic layers
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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
- H01B7/1875—Multi-layer sheaths
- H01B7/188—Inter-layer adherence promoting means
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- Manufacturing Of Electric Cables (AREA)
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Abstract
The invention discloses production equipment and a production method of a composite smooth aluminum sleeve cable sheath, wherein the production equipment comprises a cable pay-off rack, an aluminum tape cladding device, an aluminum sleeve welding device, an aluminum sleeve drawing device, a multilayer co-extrusion device, a cooling water tank and a cable take-up device, the double-gun welding device comprises two welding gun modules, each welding gun module comprises a mold frame and a welding gun arranged corresponding to the mold frame, the second group of welding gun modules perform second welding on the welding seams of the first group of welding gun modules after welding, and the aluminum sleeve drawing device is used for reducing the diameter of an aluminum sleeve. The invention adopts the double-gun welding device to weld the flat aluminum sleeve, the welding line is straight, the welding line quality is more reliable, and the surface of the welding line of the smooth aluminum sleeve after diameter reduction is smooth and round after the welded aluminum sleeve passes through the drawing die.
Description
Technical Field
The invention relates to a high-voltage cable production technology.
Background
In the existing corrugated aluminum sleeve high-voltage cable, a certain gap exists between the aluminum sleeve and the buffer layer in the rolling process of the corrugated aluminum sleeve, and the size of the gap is controlled according to the process.
The existing corrugated aluminum sleeve high-voltage cable process control is specified, and the gap between the aluminum sleeve and the buffer strip is 0.5-1.0 mm. In the production process, the buffer layer is in indirect contact with the cable outer shield and the corrugated aluminum sleeve, and belongs to point contact. The shallower the aluminum jacket embossments, the worse the contact. The semiconductive buffer layer is composed of a layer of semiconductive non-woven fabric, a layer of semiconductive fluffy cotton with the thickness of about 1.5mm, and a layer of conductive polyacrylate expansion powder which is not provided with conductivity is coated in the middle of the semiconductive non-woven fabric. Although the fluffy cotton has the semi-conductive property, the fluffy cotton is easy to deform due to the loose and porous structure, so that the conductive performance of the fluffy cotton is reduced; and the polyacrylate expansion powder required for water resistance does not have conductivity by itself. Therefore, the contact capacity of the insulated wire core of the cable and the aluminum sleeve (shield) is reduced, the semi-conductive insulation shield is in a suspension potential state, the suspension potential is higher as the voltage of the cable is higher, and further poor-contact type discharge occurs, after the cable runs for several years, the internal electric corrosion phenomenon occurs on part of the cable, the discharge capacity is increased along with the rise of the voltage, and hidden dangers are generated on the long-term safe running of the cable.
In the prior art, a coating process is adopted for hot melt adhesive between an aluminum sleeve and an outer sheath, the thickness of the hot melt adhesive is not uniform enough, and the thickness is not easy to control.
In addition, the existing corrugated aluminum sleeve high-voltage cable is welded by a single gun in the aluminum sleeve welding process, so that the welding is firm, but the surface of the welding seam has a dent. If the aluminum sleeve is drawn by a drawing die (reducing), the weld seam dent caves in the inner surface of the aluminum sleeve, and the gap between the smooth aluminum sleeve and the cable insulation layer is reduced after the aluminum sleeve is drawn, if the dent is serious, the weld seam dent of the aluminum sleeve is possibly clung to the surface of the insulation shield, and after the cable is bent for many times through production, construction and the like, the weld seam dent of the aluminum sleeve is possibly damaged the cable insulation shield layer, thereby causing hidden troubles to the long-term safe operation of the cable.
Disclosure of Invention
The invention aims to solve the technical problems that the hot melt adhesive coating of a high-voltage cable produced by wrinkle or flat aluminum sleeve high-voltage cable equipment and a high-voltage cable produced by the process in the prior art is not uniform enough and is easy to bow or wrinkle, and the problem that the surface of a welding seam of an aluminum sleeve is indented.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a compound level and smooth aluminium sheathing cable sheath production facility, includes cable pay off rack, aluminium strip cladding device, aluminium sheathing welding set, aluminium sheathing draw-off gear, multilayer crowded device altogether, cooling trough and cable take-up, install the cable core dish on the cable pay off rack for emit the cable core, install the aluminium tape dish on the aluminium strip pay off rack for emit the aluminium strip, aluminium strip cladding device is used for cladding the aluminium strip outside the cable core, two rifle welding set are used for welding the aluminium strip and form the aluminium sheathing, two rifle welding set include two welder modules, the welder module includes die carrier and the welder that corresponds the die carrier setting, and the second welder module of second group carries out the second welding on the welding seam after the first group welder module has welded, aluminium sheathing draw-off gear is used for carrying out the undergauge to the aluminium sheathing, multilayer crowded device altogether includes multilayer crowded aircraft nose altogether, The hot melt adhesive extruder, the outer sheath extruder and the outer conducting layer extruder respectively extrude hot melt adhesive, outer sheath material melt and outer conducting layer melt and convey the hot melt adhesive, outer sheath material melt and the outer conducting layer melt to the multilayer co-extruder head, the multilayer co-extruder head compounds the aluminum sleeve, the hot melt adhesive, the outer sheath and the outer conducting layer together and carries out cooling forming through a cooling water tank, a take-up reel is installed on the cable take-up device, and a finished product composite smooth aluminum sleeve high-voltage cable is wound on the take-up reel.
Preferably, the double-gun welding device adopts a tungsten electrode welding gun, and the distance between the two welding guns is the outer diameter of the outer sleeve of the porcelain bottle of the tungsten electrode welding gun.
Preferably, the welding current of the former welding gun is A1, the welding current of the latter welding gun is A2, and A2 is greater than A1.
Preferably, A2 is 1.5-3% larger than A1.
Preferably, separate power supplies are used for both torches, and one of them is an AC power supply and the other is a DC power supply.
Preferably, the diameter reduction ratio before and after drawing the aluminum jacket is not more than 9%.
Preferably, the two-gun welding device is provided with two groups along the cable conveying direction, and when one group of the two-gun welding device fails, the other group of the two-gun welding device is started to weld.
Preferably, the device further comprises an inner layer extruder, wherein the inner layer extruder is used for extruding the inner layer melt and conveying the inner layer melt to the multi-layer co-extrusion head.
Preferably, a traction device for traction cable conveying is arranged between the aluminum sleeve drawing device and the multilayer co-extrusion device.
The invention also provides a production method of the composite smooth aluminum sheathed cable sheath, which adopts the production equipment of the composite smooth aluminum sheathed cable sheath to produce and comprises the following steps:
s1: the cable core is paid out from a cable core disc on a cable pay-off rack, and after an aluminum tape is paid out from an aluminum tape disc on an aluminum tape pay-off rack, the aluminum tape is coated outside the cable core through an aluminum tape coating device;
s2: welding an aluminum strip by a double-gun welding device to form an aluminum sleeve;
s3: reducing the diameter of the aluminum sleeve by an aluminum sleeve drawing device;
s4: compounding the aluminum sleeve, the hot melt adhesive, the outer sheath and the outer conductive layer together through a multi-layer co-extrusion machine head;
s5: cooling and molding the cable after composite molding through a cooling water tank;
s6: and winding the finished composite smooth aluminum sleeve high-voltage cable on a take-up reel through a cable take-up device.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the cable is designed by adopting the composite smooth aluminum sleeve, so that the electric field distribution is more uniform after the semi-conductive buffer layer is integrally and tightly contacted with the inner surface of the smooth aluminum sleeve, and the partial discharge on the surface of the insulation shield is avoided, and the electric corrosion phenomenon is further generated; the smooth aluminum-sheathed cable has a more compact structure, the outer diameter of the smooth aluminum-sheathed cable is smaller than that of the corrugated aluminum-sheathed cable, raw materials are saved, and the production cost of the cable is reduced.
2. The single gun welding sometimes has defects such as missing welding, rosin joint, welding infirm, consequently adopts two rifle welding set welding flat aluminium cover, on the basis of a bit of indenture to original single gun welding seam, carries out the welding for the second time again, and the welding aluminium strip is indulged the package and is formed the welding behind the sizing die carrier fixing device of design through the mould in the die carrier, and the welding seam straight line is straight, can not remove about, and the welding seam quality is more reliable. The welding speed can be improved by using the double welding guns, different welding parameters can be selected simultaneously, the two welding guns are provided with independent welding power supplies, AC welding and DC welding can be selected firstly, different balance or pulse is provided, the welding has deep penetrating power, the welding is firmer, the surface of a welding seam is smoother, no dent is formed, and the quality is more reliable. Therefore, the original weld seam indentation is made up by two times of welding, the surface of the weld seam is smoother, and after the welded aluminum sleeve passes through the drawing die, the surface of the weld seam of the reduced smooth aluminum sleeve is smooth and round.
3. The double-gun welding device is designed into two groups, when one group of welding guns breaks down, the other group of welding guns are automatically started immediately, the machine halt is avoided, and the welding quality is ensured.
4. The smooth aluminum sleeve is further coated with a layer of hot melt adhesive to achieve an anti-corrosion effect, and the hot melt adhesive has a key effect of firmly bonding the outer sheath and the smooth aluminum sleeve together, namely the aluminum sleeve, the hot melt adhesive and the outer sheath are compounded together, so the compound smooth aluminum sleeve is called as a compound smooth aluminum sleeve for short. The invention designs a three-layer co-extrusion technology of a hot melt adhesive, an outer sheath and an outer conductive layer, and the hot melt adhesive extrusion technology has the advantages that the thickness of the extruded hot melt adhesive is uniform, the thickness can be uniformly controlled, and the periphery surface of a smooth aluminum sleeve is completely covered, so that the hot melt adhesive not only achieves the anticorrosion effect, but also plays a role in adhesion, and the cable outer sheath, the conductive layer and the smooth aluminum sleeve are firmly adhered together.
5. The three-layer co-extrusion device enables the smooth aluminum sleeve, the outer sheath and the conducting layer to be tightly integrated, and the smooth aluminum sleeve cable can not bow or wrinkle when being bent and wound and constructed by utilizing the characteristics of large elastic modulus, large bending shrinkage and the like of the outer sheath when being bent, so that the cable quality is ensured.
6. The sheath is co-extruded in multiple layers, so that the eccentricity of each layer can be reduced, the aluminum sleeve, the hot melt adhesive, the outer sheath and the conducting layer are tightly combined, the thickness of the sheath layer is increased, and the voltage-resistant breakdown level of the cable sheath layer can be improved. The multilayer co-extrusion machine head adopts the design of the flow channel to improve the melting pressure of the machine head, so that the joint of the hot melt adhesive, the outer sheath and the conductive layer is more compact under the action of high pressure, and the surface smoothness of the conductive layer is improved; the flow rate of the material is improved, the retention time of the material in the machine head is reduced, the possibility of producing and burning is reduced, the material in small dead angles can be quickly taken away, the generation of burnt particles is reduced, and the surface quality of the cable is improved.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a twin gun welding apparatus;
FIG. 3 is a schematic view of a multi-layer coextrusion apparatus;
FIG. 4 is a schematic structural diagram of a multi-layer co-extrusion head;
in the figure: 1: a cable pay-off rack; 2: an aluminum strip pay-off rack; 3: an aluminum strip cladding device; 4: a double gun welding device; 41: a welding gun; 42: a mold frame; 43: a flaw detector; 5: an aluminum jacket drawing device; 6: a traction device; 7: a multilayer co-extrusion device; 71: a multi-layer co-extrusion machine head; 701: a hot melt adhesive inlet; 702: an inner layer melt inlet; 703: an outer jacket melt inlet; 704: an outer conductive layer melt inlet; 705: extruding a mold sleeve; 706: a first extrusion molding die core; 707: a second extrusion molding die core; 708: a third extrusion molding die core; 72: a hot melt adhesive extruder; 73: an outer sheath extruder; 74: an outer conductive layer extruder; 8, a cooling water tank; 9: a cable take-up device; 100: a flat aluminum jacketed cable core; 101: co-extruding the layers; 1001: a cable core; 1002: a flat aluminum sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.
Example one
Referring to fig. 1 to 3, a production device for a composite smooth aluminum sheath cable sheath comprises a cable pay-off rack 1, an aluminum tape pay-off rack 2, an aluminum tape cladding device 3, a double-gun welding device 4, an aluminum sheath drawing device 5, a multi-layer co-extrusion device 7, a cooling water tank 8 and a cable take-up device 9, wherein a cable core disc is installed on the cable pay-off rack and used for paying off a cable core, an aluminum tape disc is installed on the aluminum tape pay-off rack and used for paying off an aluminum tape, the aluminum tape cladding device is used for cladding the aluminum tape outside the cable core, the double-gun welding device is used for welding the aluminum tape and forming an aluminum sheath, the aluminum sheath drawing device is used for reducing the diameter of the aluminum sheath, the multi-layer co-extrusion device 7 comprises a multi-layer co-extrusion machine head 71, a hot melt adhesive extruder 72, an outer sheath extruder 73 and an outer conductive layer extruder 74, and the hot melt adhesive extruder, the outer conductive layer extruder and the outer hot melt adhesive conductive layer extruder respectively extrude, The aluminum sheath, the hot melt adhesive, the outer sheath and the outer conducting layer are compounded together by the multi-layer co-extrusion machine head and are cooled and formed through the cooling water tank, and the take-up reel is mounted on the cable take-up device and winds the finished composite smooth aluminum sheath high-voltage cable onto the take-up reel.
The double-gun welding device comprises two welding gun modules, the welding gun modules comprise a mold frame 42 (a mold is arranged on the mold frame) and welding guns 41 corresponding to the mold frame, and the second group of welding gun modules perform second welding on the welded seams of the first group of welding gun modules. This is the single gun welding to prior art adoption, and the welding seam can be some indents and can have hourglass welding, rosin joint sometimes, weld defects such as not firm, therefore adopts double gun welding set welding flat aluminium cover, on original first welding basis, carries out the welding for the second time, and original welding seam indent has been compensatied in twice welding, and the welding seam surface is more level and more smooth, in addition, the welding for the second time has darker osmotic force. The welding aluminum strip is longitudinally wrapped by the die in the die set and then is subjected to forming welding by the designed sizing die set fixing device, the welding line is straight and straight, the left and right movement is avoided, and the welding line quality is more reliable.
The structure of two welding guns and the corresponding die carrier structure can refer to the prior art, and the distance between the two welding guns is the outer diameter of the outer sleeve of the tungsten electrode welding gun porcelain bottle. Like this, two welder interval fixed positions and interval are little, and single rifle welding permeability is limited, and after the welding of preceding welder, the welding is followed to a back welder, and the permeability is stronger, and the welding seam is more level and more smooth more reliable.
The two welding guns can select different welding parameters, according to the welding sequence, the welding current of the former welding gun is A1, the welding current of the latter welding gun is A2, A2 is larger than A1, and specifically, A2 is 1.5-3% larger than A1. One skilled in the art will appreciate that the current level can be designed according to the thickness dimension of the aluminum strip. In addition, two welding guns have independent welding power supplies, AC welding and DC welding can be selected firstly, different balance or pulse is provided, the welding has deep penetration force, the welding is firmer, the surface of a welding line is smoother, no dent is formed, and the quality is more reliable.
The welding speed can be improved by using the double welding guns, and meanwhile, after the welded aluminum sleeve passes through the drawing die, the surface of the welding seam of the diameter-reduced smooth aluminum sleeve is smooth and round. Wherein the diameter shrinkage ratio before and after drawing the aluminum sleeve is not more than 9 percent. According to the standard regulation, the larger the cable specification is, the thicker the average thickness of the aluminum sleeve is, the thicker the aluminum sleeve is, if the diameter reduction ratio is larger, the drawing force is also larger, the equipment is easy to damage, therefore, the diameter reduction ratio before and after the aluminum sleeve is drawn once is not more than 9%. The larger the cable specification is, the thicker the aluminum sleeve is, and two dies can be arranged for drawing so as to reduce the reducing proportion and the drawing force.
Furthermore, the double-gun welding device is provided with two groups along the cable conveying direction, and when one group of the double-gun welding device breaks down, the other group of the double-gun welding device is automatically started to weld. The fault shutdown of the welding gun is avoided, and the welding quality is ensured.
The invention discloses a multi-layer co-extrusion machine head, which belongs to the prior art and adopts the multi-layer co-extrusion machine head to compound an aluminum sleeve, a hot melt adhesive, an outer sheath and an outer conductive layer together. Compared with the prior art for coating the hot melt adhesive, the extruded hot melt adhesive has uniform thickness, the thickness can be uniformly controlled, and the surfaces around the smooth aluminum sleeve completely cover, so that the hot melt adhesive not only achieves the anti-corrosion effect, but also plays a role in adhesion, and firmly adheres the cable outer sheath, the conductive layer and the smooth aluminum sleeve together.
Further, an inner layer extruder can be further included, and the inner layer extruder is used for extruding the inner layer melt and conveying the inner layer melt to the multi-layer co-extrusion machine head.
Referring to fig. 4, the multi-layer co-extrusion head includes a head body, the head body is provided with a plurality of glue inlets and a plurality of glue inlet channels respectively communicated with the plurality of glue inlets, and outlets of the glue inlet channels are provided with a shunting body. The glue inlet and the glue inlet channel correspond to the setting of multilayer coextrusion, and a hot melt adhesive inlet 701, an inner layer melt inlet 702, an outer sheath melt inlet 703 and an outer conductive layer melt inlet 704 are respectively arranged corresponding to the hot melt adhesive extruder 72, the inner layer extruder, the outer sheath extruder 73 and the outer conductive layer extruder 74.
The multilayer co-extrusion machine head adopts a structure for improving the melting pressure of the machine head on the design of a flow channel. Specifically, the splitter is of a conical structure, and a plurality of annular flow channels which gradually narrow from the inlet end to the outlet end of the glue inlet channel are axially arranged on the circumferential surface of the splitter. Therefore, the melting pressure of the machine head can be improved, the joint of the hot melt adhesive, the outer sheath and the conductive layer is more compact under the action of high pressure, and the surface smoothness of the conductive layer is improved. It will be understood by those skilled in the art that the specific set point and range of melt pressure is set according to the thickness of each jacket layer.
In addition, refer to the structure of multilayer coextrusion aircraft nose among the prior art, multilayer coextrusion aircraft nose is equipped with the extrusion molding mould, the extrusion molding mould includes extrusion molding die sleeve and extrusion molding mold core, and wherein the quantity of extrusion molding mold core corresponds the design according to advancing the jiao dao, in this embodiment, corresponds four layers of coextrusion technique, sets up an extrusion molding die sleeve 705 to it has extrusion molding mold core one 706, two 707 of extrusion molding mold core and four 708 of extrusion molding mold core to correspond the design, forms four runners, corresponds hot melt adhesive, inlayer fuse-element, oversheath fuse-element, outer conducting layer fuse-element.
Furthermore, in order to improve the flow rate of materials in the machine head, the inner cone angle of the extrusion molding die sleeve is 4-9 degrees larger than the outer cone angle of the extrusion molding die core. The angle enables the extrusion pressure of the plastic of the sheath to be gradually increased, the tissue between the plastic layers of the sheath is compact, the sheaths of all layers are tighter, the angle difference is larger, the extrusion pressure is larger, but the angle difference is not too large, otherwise, the extrusion pressure is increased, and the extrusion flow is reduced. Therefore, the flow rate of the material can be improved, the retention time of the material in the machine head is reduced, the possibility of production scorching is reduced, the material in small dead angles can be quickly taken away, the generation of scorching particles is reduced, and the surface quality of the cable is improved.
The cable pay-off rack 1, the aluminum strip pay-off rack 2, the aluminum strip coating device 3, the aluminum sleeve drawing device 5, the cooling water tank 8 and the cable take-up device 9 can refer to the prior art, and are not described herein again.
Example two
A composite smooth aluminum sheathed cable sheath production method adopts the composite smooth aluminum sheathed cable sheath production equipment of the embodiment I to carry out production, and the production process flow is as follows:
s1: the cable core is paid out from a cable core disc on a cable pay-off rack, and after an aluminum tape is paid out from an aluminum tape disc on an aluminum tape pay-off rack, the aluminum tape is coated outside the cable core through an aluminum tape coating device;
s2: welding an aluminum strip by a double-gun welding device to form an aluminum sleeve;
s3: reducing the diameter of the aluminum sleeve by an aluminum sleeve drawing device;
s4: compounding the aluminum sleeve, the hot melt adhesive, the outer sheath and the outer conductive layer together through a multi-layer co-extrusion machine head;
s5: cooling and molding the cable after composite molding through a cooling water tank;
s6: and winding the finished composite smooth aluminum sleeve high-voltage cable on a take-up reel through a cable take-up device.
In the production process flow of the designed smooth aluminum sleeve high-voltage cable, drawing (reducing) the aluminum sleeve is an important newly designed process, according to the design structure, a layer of hot melt adhesive is required to be coated outside the smooth aluminum sleeve to achieve the anti-corrosion effect, and the key effect of the hot melt adhesive is to firmly bond the outer sheath and the smooth aluminum sleeve together, namely the aluminum sleeve, the hot melt adhesive and the outer sheath are combined together, so the composite smooth aluminum sleeve is called as a composite smooth aluminum sleeve for short. Therefore, the three-layer co-extrusion device technology of the hot melt adhesive, the sheath and the conductive layer is innovatively designed, the hot melt adhesive extrusion technology is uniform in thickness of the extruded hot melt adhesive, the thickness of the extruded hot melt adhesive can be uniformly controlled, and the peripheral surface of the completely covered smooth aluminum sleeve is completely covered, so that the hot melt adhesive not only achieves the anti-corrosion effect, but also plays a role in adhesion, and the cable sheath, the conductive layer and the smooth aluminum sleeve are firmly adhered together.
The process requirements of coating the hot melt adhesive outside the composite smooth aluminum sleeve are as follows: argon arc welding or continuous extrusion is used for wrapping a cable core of the high-voltage cable to form an aluminum sleeve, after the smooth aluminum sleeve passes through a specially designed drawing die, a cable core semi-finished product coated with the smooth aluminum sleeve is drawn through a three-layer co-extrusion molding machine device and then enters a water tank for cooling, a hot melt adhesive is condensed to form an anticorrosive layer after being cooled, the hot melt adhesive is firmly adhered to an outer sheath and the aluminum sleeve, finally, the finished product coated with the hot melt adhesive and the outer sheath is wound on a take-up reel, and the outer sheath cannot bow or wrinkle when the cable is bent and taken up by utilizing the characteristics of large elastic modulus, large bending shrinkage and the like of the outer sheath, so that the appearance quality of the cable is ensured.
The smooth aluminum sheathed cable has the advantages that: the designed outer sheath three-layer co-extrusion device enables the smooth aluminum sheath, the outer sheath and the conducting layer to be tightly integrated, and the phenomenon of arching or wrinkling can not be generated during the bending take-up and construction of the cable, so that the appearance quality of the cable is ensured; the high-voltage cable is designed by adopting the composite smooth aluminum sleeve, so that the electric field distribution is more uniform after the semi-conductive buffer layer is integrally and tightly contacted with the inner surface of the smooth aluminum sleeve, the partial discharge on the surface of the insulation shield is avoided, and the electric corrosion phenomenon cannot occur after the cable runs for a long time; the smooth aluminum-sheathed cable has a more compact structure, the outer diameter of the smooth aluminum-sheathed cable is smaller than that of the corrugated aluminum-sheathed cable, raw materials are saved, and the production cost of the cable is reduced.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (6)
1. The utility model provides a compound level and smooth aluminium sheathing cable sheathing production facility which characterized in that: the aluminum tape welding device comprises a cable pay-off rack, an aluminum tape coating device, a double-gun welding device, an aluminum tape drawing device, a multilayer co-extrusion device, a cooling water tank and a cable take-up device, wherein a cable core disc is installed on the cable pay-off rack and used for releasing a cable core, an aluminum tape disc is installed on the aluminum tape pay-off rack and used for releasing an aluminum tape, the aluminum tape coating device is used for coating the aluminum tape outside the cable core, the double-gun welding device is used for welding the aluminum tape and forming an aluminum cover, the double-gun welding device comprises two welding gun modules, each welding gun module comprises a die set and a welding gun corresponding to the die set, the second welding gun modules are used for carrying out second welding on welding seams after the first welding gun module is welded, the aluminum cover drawing device is used for reducing the diameter of the aluminum cover, and the multilayer co-extrusion device comprises a multilayer co-extrusion machine head, a hot melt adhesive extruder and an outer sheath extruder, The outer conducting layer extruder is used for extruding hot melt adhesive, an outer sheath extruder and an outer conducting layer extruder respectively and conveying the hot melt adhesive, an outer sheath material melt and the outer conducting layer melt to the multilayer coextrusion machine head, the multilayer coextrusion machine head compounds an aluminum sleeve, the hot melt adhesive, the outer sheath and the outer conducting layer together and carries out cooling forming through a cooling water tank, a take-up reel is installed on a cable take-up device, a finished product composite smooth aluminum sleeve high-voltage cable is wound on the take-up reel, a tungsten electrode welding gun is adopted by the double-gun welding device, the distance between the two welding guns is the outer diameter of an outer sleeve of a porcelain bottle of the tungsten electrode welding gun, the welding current of the former welding gun is A1, the welding current of the latter welding gun is A2, A2 is larger than A1, the A2 is 1.5-3% larger than the A1, the two welding guns both adopt independent power supplies, one of the two welding guns is an AC power supply, and the other is a DC power supply.
2. The composite smooth aluminum sheath cable sheath production equipment of claim 1, wherein: the reducing ratio before and after drawing the aluminum sleeve is not more than 9 percent.
3. The composite smooth aluminum sheath cable sheath production equipment of claim 1, wherein: the double-gun welding device is provided with two groups along the cable conveying direction, and when one group of the double-gun welding device breaks down, the other group of the double-gun welding device is started to weld.
4. The composite smooth aluminum sheath cable sheath production equipment as claimed in any one of claims 1 to 3, wherein: the multi-layer co-extrusion die further comprises an inner layer extruder, and the inner layer extruder is used for extruding the inner layer melt and conveying the inner layer melt to the multi-layer co-extrusion die head.
5. The composite smooth aluminum sheath cable sheath production equipment of claim 4, wherein: and a traction device for traction cable conveying is arranged between the aluminum sleeve drawing device and the multilayer co-extrusion device.
6. A production method of a composite smooth aluminum sleeve cable sheath is characterized by comprising the following steps: the production equipment for producing the composite smooth aluminum sleeve cable sheath of any one of claims 1 to 5 comprises the following steps:
s1: the cable core is paid out from a cable core disc on a cable pay-off rack, and after an aluminum tape is paid out from an aluminum tape disc on an aluminum tape pay-off rack, the aluminum tape is coated outside the cable core through an aluminum tape coating device;
s2: welding an aluminum strip by a double-gun welding device to form an aluminum sleeve;
s3: reducing the diameter of the aluminum sleeve by an aluminum sleeve drawing device;
s4: compounding the aluminum sleeve, the hot melt adhesive, the outer sheath and the outer conductive layer together through a multi-layer co-extrusion machine head;
s5: cooling and molding the cable after composite molding through a cooling water tank;
s6: and winding the finished composite smooth aluminum sleeve high-voltage cable on a take-up reel through a cable take-up device.
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| CN114283991A (en) * | 2021-12-20 | 2022-04-05 | 杭州电缆股份有限公司 | Smooth aluminum sheath high-voltage power cable and production process thereof |
| CN117095856A (en) * | 2023-03-15 | 2023-11-21 | 特变电工山东鲁能泰山电缆有限公司 | High-voltage cable preparation method, production line and high-voltage cable |
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