CN113241225B - Fireproof cable tubular aluminum sheath forming system and method - Google Patents
Fireproof cable tubular aluminum sheath forming system and method Download PDFInfo
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- CN113241225B CN113241225B CN202110539047.5A CN202110539047A CN113241225B CN 113241225 B CN113241225 B CN 113241225B CN 202110539047 A CN202110539047 A CN 202110539047A CN 113241225 B CN113241225 B CN 113241225B
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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
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Abstract
The invention provides a system and a method for forming a tubular aluminum sheath of a fireproof cable. The forming system comprises a forming device, an argon arc welding machine, a belt tractor and a workbench which are sequentially arranged on the same production line; the forming device comprises a support frame, an adjusting base, a first rolling forming die, a second rolling forming die, a first forming sheath, a second forming sheath and a circle correcting die which are linearly and sequentially distributed on the adjusting base, wherein the adjusting base is installed on a workbench through the support frame; the system has the beneficial effects that after the light and thin aluminum strip is bent and formed, the aluminum tube sheath is welded by an argon arc welding machine and coated on the cable core of the fireproof cable, the formed aluminum tube has a smooth surface, the product size precision is high, and the production specification range is large.
Description
Technical Field
The invention relates to the field of metal sheath processing and forming equipment in the wire and cable industry, in particular to a system and a method for forming a tubular aluminum sheath of a fireproof cable.
Background
With the rapid development of the national electric power industry, the demand of high-voltage cable products is increasing day by day, and the requirements on quality are also higher and higher. Cables are generally made by twisting several or several groups of conductors, each group of conductors being insulated from each other, usually twisted around a center and covered with a highly insulating covering, and have the characteristics of internal current conduction and external insulation. The fireproof cable is widely applied to important departments such as high-rise buildings, subways, power plants, nuclear power plants, hospitals, airport lamps and the like and public places, two kinds of fireproof cables are mainly arranged on the market at present, one kind of the fireproof cable is a magnesium oxide insulation rigid fireproof cable and a mica tape insulation corrugated copper sheath flexible fireproof cable, the metal layer of the existing fireproof cable is provided with a copper sheath, and at present, the copper resource in China is deficient, the copper price is high, and the cost of the fireproof cable is too high. Compared with copper, the aluminum metal is lower in cost root, can achieve the same effect as a copper sheath when serving as a protective sleeve, can be isolated when a cable is fired externally, prevents external flames from burning the internal structure of the cable, continuously protects the cable, and improves the fire resistance and the use safety of the cable.
In the production process of the aluminum sheath cable, the forming of the aluminum sheath is one of key processes for manufacturing the aluminum sheath cable, and the later welding process is directly influenced, so that the aluminum sheath forming device plays the most important role in the whole aluminum sheath forming system. The traditional way is that the aluminium slab band of cutting out in advance passes through forming device shaping to the aluminium tubulose, traditional aluminium pipe forming device adopts a set of fixed forming roller to carry out roll extrusion direct forming to the track more, consequently lead to the fashioned circumferential edge of chimney filter reason not smooth, in succession, and fixed forming roller, can make the track shaping in-process adjust, the centering, change is more complicated, in addition its mould adjustment is difficult, hardly guarantee that the shaping seam is on a straight line all the time, bring the degree of difficulty for subsequent welding process, greatly reduced aluminium sheath's production quality. In addition, most of the moulds of the existing aluminium sheath forming device are made of metal materials, the outer surface of the aluminium sheath is easy to scrape in the aluminium sheath forming process, and the aluminium sheath is easy to be adhered to the mould, so that the aluminium sheath is unstable in forming,
disclosure of Invention
The invention provides a system and a method for forming a tubular aluminum sheath of a fireproof cable, aiming at the defects of the prior art.
In order to achieve the technical purpose, the invention provides a fireproof cable tubular aluminum sheath forming system, which is characterized in that: the forming system comprises a forming device, an argon arc welding machine, a belt tractor and a workbench which are sequentially arranged on the same production line; the forming device comprises a support frame, an adjusting base, a first rolling forming die, a second rolling forming die, a first forming sheath, a second forming sheath and a circle correcting die which are linearly and sequentially distributed on the adjusting base, wherein the adjusting base is arranged on a workbench through the support frame; the first rolling forming die and the second rolling forming die are both composed of an upper roller and a lower roller, the upper roller is provided with a first U-shaped groove matched with the cable core, a U-shaped gap is arranged between the upper roller and the lower roller, and the opening of the first U-shaped groove is communicated with the U-shaped gap; the inner cavities of the first forming sheath and the second forming sheath are both conical cavities with inlets larger than outlets, and the compression angle a of the inner conical surfaces is 3-5 degrees; the inlet part of the rounding die is provided with a conical angle which is retracted inwards from the inlet end to the outlet end; the inner diameters of the outlet end of the second forming protective sleeve and the outlet part of the circle correcting die are equal and are the same as the outer diameter of the formed protective sleeve; the argon arc welding machine is arranged at the edge of the workbench behind the circle correcting die, and a welding head of the argon arc welding machine is arranged above the outlet part of the circle correcting die; the belt tractor is arranged behind the argon arc welding machine and comprises a belt conveyor bracket, an upper conveying belt, a lower conveying belt and a transmission mechanism, wherein a gap through which the forming protective sleeve passes is arranged between the upper conveying belt and the lower conveying belt, and the gap is on the same straight line with the central line of the forming device; the first rolling forming die, the second rolling forming die, the first forming sheath, the second forming sheath and the circle correcting die are all made of nylon MC901 bars.
The invention has the following excellent technical scheme: the adjusting bracket comprises a mounting base and two supporting plates symmetrically arranged on the mounting base, first strip-shaped bolt grooves distributed along the length direction of the mounting base are respectively arranged at two ends of the mounting base, second strip-shaped bolt grooves distributed along the width direction of the mounting base are symmetrically arranged on the adjusting base, the distribution length of the second strip-shaped bolt grooves extends from one end to the other end of the adjusting base and is perpendicular to the first strip-shaped bolt grooves on each adjusting bracket, and the mounting base is arranged in the second strip-shaped bolt grooves of the adjusting base through adjusting bolts; the upper and lower rollers of the first rolling forming die and the second rolling forming die are respectively arranged between two supporting plates of the corresponding adjusting bracket through rotating shafts, the first forming sheath and the second forming sheath are fixedly arranged between the two supporting plates of the corresponding adjusting bracket through fixing hoops, and the circle correcting die is arranged between the two supporting plates of the corresponding adjusting bracket through an adjusting mechanism; the center lines of the first forming sheath, the second forming sheath and the rounding die are on the same straight line.
The invention has the following excellent technical scheme: the nut thimble locking mechanism comprises an L-shaped locking block and a nut thimble, the L-shaped locking block is tightly attached to the edge of the adjusting base and is fixedly locked through a fixing bolt, and the nut thimble penetrates through the locking block from the outer side of the L-shaped locking block to tightly push the base of the adjusting support.
The invention has the advantages that: the first rolling forming die and the second rolling forming die are identical in structural size, a first U-shaped groove with the width larger than 4-7 mm of the diameter of the cross section of a cable core is formed in the middle of the upper roller along the circumferential direction, a U-shaped groove matched with the wheel body of the upper roller is formed in the middle of the lower roller along the circumferential direction, the wheel body of the upper roller is arranged in the U-shaped groove of the lower roller, and a U-shaped gap with the width matched with the wall thickness of the aluminum sheath sleeve is formed between the surface of the wheel body of the upper roller and the inner groove surface of the U-shaped groove of the lower roller.
The invention has the following excellent technical scheme: the diameter of the outlet end of the first forming sheath is larger than or equal to the inner diameter of the inlet end of the second forming sheath, and the diameter of the outlet end of the second forming sheath is equal to the outer diameter of the forming aluminum sheath.
The invention has the following excellent technical scheme: the taper angle b of the inlet part of the rounding die is 15 degrees; the school circle aperture of school circle mould is Dmm, and aluminium strip thickness is h, and fireproof cable core diameter D, D are calculated by following formula and are reachd: d is 2 × h + D.
The invention has the following excellent technical scheme: the first rolling forming die, the second rolling forming die, the first forming sheath, the second forming sheath and the circle correcting die are respectively formed by processing Cr40 materials through adjusting brackets and are subjected to modulation treatment and blackening rust-proof treatment; and a traction wheel is arranged between the second rolling forming die and the first forming sheath, and the traction wheel is arranged on the adjusting base through a traction bracket.
In order to achieve the technical purpose, the invention also provides a method for forming the tubular aluminum sheath of the fireproof cable, which is characterized by comprising the following steps of: the method uses the fire-proof cable tubular aluminum sheath forming system in any one of claims 1 to 7 for forming, and comprises the following specific steps:
(1) manually cutting the position 4-6 m away from the front end of the prepared aluminum strip into a width 4-6 cm smaller than the diameter of the circle correcting die, sequentially passing the cut part of the aluminum strip through a U-shaped gap between an upper roller and a lower roller of the first rolling forming die and the second rolling forming die, sequentially passing through the first forming sheath, the second forming sheath and the circle correcting die, and then putting the cut part on a belt tractor;
(2) starting a belt tractor, adjusting air pressure of an air cylinder of the belt tractor to enable a conveying belt on the tractor to compact an aluminum strip, adjusting the traction speed to enable the tractor to pull the aluminum strip for 8-12 m until the appearance of a formed hollow aluminum protective pipe at the outlet of the tractor meets the design requirement; in the traction process of the belt tractor, the aluminum belt is led to the central positions of the first rolling forming die, the second rolling forming die, the first forming sheath, the second forming sheath and the circle correcting die to be formed into the aluminum pipe by adjusting the front, back, left and right positions of the adjusting supports of the first rolling forming die, the second rolling forming die, the first forming sheath, the second forming sheath and the circle correcting die on the adjusting base;
(3) loosening the air pressure of an air cylinder of the belt tractor, cutting off the front part of the aluminum belt at the outlet of the tractor, placing a cable core of the fireproof cable above the aluminum belt, sequentially passing through U-shaped grooves on rollers on a first rolling forming die and a second rolling forming die, sequentially passing through a first forming sheath, a second forming sheath and a rounding die, then drawing to the outlet of the belt tractor, extending out the cut surface of a formed aluminum pipe, bundling the head end of the formed aluminum pipe and the end of a core of the fireproof cable in the aluminum pipe by using a steel wire, and opening the air pressure of the air cylinder of the belt tractor to enable a conveying belt on the tractor to compact the aluminum pipe sheath and the cable core which are wrapped with the core of the fireproof cable together;
(4) starting the argon arc welding machine, adjusting the welding current and the welding speed of the welding machine, adjusting the air pressure of an air cylinder of the belt tractor, ensuring that the fireproof cable core with the aluminum pipe sheath cannot deform due to overlarge pressure in the traction process, and welding the joint of the aluminum pipe sheath which passes through the rounding die and then is coated outside the cable core in the traction process of the belt tractor.
The further technical scheme of the invention is as follows: the thickness of the aluminum strip in the step (1) is 0.6-3.0mm, and the diameter of the formed aluminum sheath is phi 15 mm-phi 100 mm.
The further technical scheme of the invention is as follows: the air pressure of an air cylinder of the belt tractor in the step (2) and the step (4) is 8-15 MPa; and (4) controlling the welding current of the argon arc welding machine in the step (4) to be 45-75A, and controlling the welding speed to be 4-8 m/min.
The forming system bends a light and thin aluminum strip with the thickness of 0.6-3.0mm into a U shape through a gap between an upper forming pinch roller and a lower forming pinch roller of a roll forming die frame, obtains an aluminum tube with a required size through a forming sleeve and a rounding die, simultaneously completes a coating process of a fireproof cable core in the aluminum tube forming process, and finally performs welding through an argon arc welding machine to realize continuous production of the metal aluminum sheath of the fireproof electric wire and cable.
The invention has the beneficial effects that:
(1) the forming device comprises two groups of rolling forming dies, two group forming sleeves and one group of rounding dies, wherein the rolling forming die frame is used for forming the aluminum strip five times in the process of forming the aluminum strip into the aluminum pipe, so that the uniform deformation and the stable forming can be ensured, the formed aluminum sheath is in butt joint on the same straight line, and the forming efficiency and the quality of the aluminum sheath are improved.
(2) The five sets of dies are all arranged on the workbench through the adjusting die frame, and the die frames can be adjusted left and right, so that the five sets of dies can be positioned on the same straight line, and the forming quality of an aluminum sheath is ensured; and the ejector pin locking mechanisms are arranged at the two ends of the adjusting frame, so that the die can be prevented from moving randomly after being adjusted in place.
(3) The two groups of rolling forming dies can realize symmetrical coiling of two side edges of the aluminum strip, ensure symmetrical coiling positions of the aluminum strip through two-time edge folding and coiling, and ensure that a sheath butt seam formed in the later stage is opposite to a welding nozzle of a welding machine; the inner diameters of the two combined type sleeves are gradually reduced, so that the uniform forming of the aluminum sheath can be ensured, and the aluminum sheath is corrected through the rounding die after forming, so that the circumferential edge of the formed sheath is ensured to be smooth and continuous.
(4) The invention draws one end of the aluminum strip and the cable core through the drawing machine, ensures that the whole forming process can be continuously and automatically completed, and improves the production efficiency.
(5) The invention adopts the argon arc welding machine to carry out the forming welding of the aluminum sheath, and can solve the problem that the aluminum sheath is easy to oxidize to generate an oxide film because aluminum molecules are very active in the welding process.
(6) The five groups of dies are all processed by nylon MC901 bars, and the material has the characteristics of high toughness, good flexibility, fatigue resistance and the like. And the surface of the aluminum strip cannot be scratched in the process of forming the aluminum strip, the problem of adhesion cannot occur, and the stable forming of the aluminum sheath is ensured.
Drawings
FIG. 1 is a schematic view of a system for forming a tubular aluminum sheath for a fire-resistant cable according to the present invention;
FIG. 2 is a schematic view of the structure of the molding apparatus of the present invention;
FIG. 3 is a schematic view of the structure of the mold adjusting bracket of the present invention;
FIG. 4 is an installation view of the nut and thimble locking mechanism of the present invention;
FIG. 5 is a schematic cross-sectional view of the first and second roll forming dies of the present invention;
FIG. 6 is a schematic cross-sectional view of first and second formed sheaths of the present invention;
FIG. 7 is a cross-sectional view of the rounding die of the present invention;
fig. 8 is a schematic view of the welding of the formed aluminum sheath of the present invention.
In the figure: 1-forming device, 100-first rolling forming die, 1001-upper roller, 1002-lower roller, 1003-U-shaped gap, 1004-first U-shaped groove, 101-second rolling forming die, 102-first forming sheath, 103-second forming sheath, 104-rounding die, 1040-adjusting mechanism, 105-supporting frame, 106-adjusting base, 1060-second strip bolt groove, 107-adjusting support, 1070-mounting base, 1071-supporting plate, 1072-first strip bolt groove, 1073-adjusting bolt 108-nut thimble locking mechanism, 1080-L-shaped locking block, 1081-nut thimble, 1082-fixing bolt, 109-traction wheel, 110-traction support, 2-argon arc welding machine, 200-welding head, 3-belt tractor, 300-belt conveyor support, 301-upper conveying belt, 302-lower conveying belt, 4-workbench, 5-cable core, 6-aluminum sheath, 7-welding seam.
Detailed description of the preferred embodiments
The invention is further illustrated by the following figures and examples. Fig. 1 to 8 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the invention and are not intended to limit the scope of the claimed invention. 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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The embodiment provides a fireproof cable tubular aluminum sheath forming system, and the forming system shown in fig. 1 and 2 comprises a forming device 1, an argon arc welding machine 2, a belt tractor 3 and a workbench 4 which are sequentially arranged on the same production line; the forming device comprises a support frame 105, an adjusting base 106, a first rolling forming die 100, a second rolling forming die 101, a first forming sheath 102, a second forming sheath 103 and a circle correcting die 104 which are linearly and sequentially distributed on the adjusting base 106, wherein the adjusting base 106 is arranged on the workbench 4 through the support frame 105, the first rolling forming die 100, the second rolling forming die 101, the first forming sheath 102, the second forming sheath 103 and the circle correcting die 104 are respectively arranged on the adjusting base 106 through adjusting supports 107 and can be adjusted transversely and longitudinally along the adjusting base 106, and nut and thimble locking mechanisms 108 are respectively arranged at two ends of each adjusting support 107; the argon arc welding machine 2 is arranged at the edge of the workbench 4 behind the circle correcting die 104, and the welding head 200 of the argon arc welding machine is arranged above the outlet part of the circle correcting die 104; the belt tractor 3 is arranged behind the argon arc welding machine 2 and comprises a belt conveyor support 300, an upper conveying belt 301, a lower conveying belt 302 and a transmission mechanism, a gap through which a forming protective sleeve passes is arranged between the upper conveying belt 301 and the lower conveying belt 302, and the gap is on the same straight line with the central line of the forming device 1; the first rolling forming die 100, the second rolling forming die 101, the first forming sheath 102, the second forming sheath 103 and the rounding die 104 are all made of nylon MC901 bars.
The embodiment provides a fireproof cable tubular aluminum sheath forming system, as shown in fig. 3 and 4, the adjusting bracket 107 comprises a mounting base 1070 and two support plates 1071 symmetrically arranged on the mounting base 1070, first strip-shaped bolt slots 1072 are respectively arranged at two ends of the mounting base 1070 and distributed along the length direction of the mounting base 1070, second strip-shaped bolt slots 1060 distributed along the width direction of the mounting base 1070 are symmetrically arranged on the adjusting base 106, the distribution length of the second strip-shaped bolt slots 1060 extends from one end to the other end of the adjusting base 106 and is perpendicular to the first strip-shaped bolt slots 1072 on each adjusting bracket 107, and the mounting base 1070 is mounted in the second strip-shaped bolt slots 1060 of the adjusting base 106 through adjusting bolts 1073; the nut thimble locking mechanism 108 comprises an L-shaped locking block 1080 and a nut thimble 1081, the L-shaped locking block 1080 is tightly attached to the edge of the adjusting base 106 and is fixed and locked by a fixing bolt 1082, and the nut thimble 1081 penetrates through the locking block from the outer side of the L-shaped locking block 1080 to tightly push against the base of the adjusting support 107. As shown in fig. 2, the upper and lower rollers of the first rolling mold 100 and the second rolling mold 101 are respectively installed between the two support plates 1071 of the corresponding adjusting bracket through the rotating shaft, the first molding sheath 102 and the second molding sheath 103 are fixedly installed between the two support plates 1071 of the corresponding adjusting bracket through the fixing hoop, and the rounding mold 104 is installed between the two support plates 1071 of the corresponding adjusting bracket through the adjusting mechanism 1040; the centerlines of the first forming sheath 102, the second forming sheath 103 and the rounding die 104 are on the same straight line. The first rolling forming die 100, the second rolling forming die 101, the first forming sheath 102, the second forming sheath 103 and the rounding die 104 are respectively formed by processing Cr40 materials through an adjusting bracket 107 and are subjected to modulation treatment and blackening rust-proof treatment; in order to facilitate stable conveying of the aluminum strip, a traction wheel 109 is arranged between the second rolling forming die 101 and the first forming sheath 102, and the traction wheel 109 is mounted on the adjusting base 106 through a traction bracket 110.
The embodiment provides a fireproof cable tubular aluminum sheath forming system, as shown in fig. 5, the first rolling forming die 100 and the second rolling forming die 101 are composed of an upper roller 1001 and a lower roller 1002, a first U-shaped groove 1004 matched with a cable core 5 is arranged on the upper roller 1001, the first U-shaped groove 1004 is arranged along the middle of the upper roller 1001 along the circumferential direction, the width of the first U-shaped groove is 4 mm-7 mm larger than the diameter of the section of the cable core 5, a U-shaped groove matched with the roller body of the upper roller 1001 is arranged along the circumferential direction in the middle of the lower roller 1002, the roller body of the upper roller 1001 is arranged in the U-shaped groove of the lower roller 1002, and a U-shaped gap 1003 matched with the wall thickness of an aluminum sheath sleeve is formed between the surface of the roller body of the upper roller 1001 and the inner groove surface of the U-shaped groove of the lower roller 1002. As shown in fig. 6, the inner cavities of the first forming sheath 102 and the second forming sheath 103 are both conical cavities with inlets larger than outlets, and the compression angle a of the inner conical surface is 3-5 degrees; the inner diameters of the outlet end of the second forming sheath 103 and the outlet part of the circle correcting die 104 are equal and are the same as the outer diameter of the formed sheath; the diameter of the outlet end of the first molded jacket 102 is larger than or equal to the inner diameter of the inlet end of the second molded jacket 103, and the diameter of the outlet end of the second molded jacket 103 is equal to the outer diameter of the molded aluminum jacket. As shown in fig. 7, the inlet portion of the rounding die 104 is provided with a tapered angle that is tapered inward from the inlet end to the outlet end, and the tapered angle b of the inlet portion of the rounding die 104 is 15 °; the school circle aperture of school circle mould 104 is Dmm, and aluminium strip thickness is h, and fireproof cable core diameter D, D are calculated by following formula and are obtained: d is 2 × h + D.
The embodiment provides a method for forming a tubular aluminum sheath of a fireproof cable, which is to form light and thin aluminum with the thickness of 0.6-3.0mm in a forming system of the tubular aluminum sheath of the fireproof cable, and comprises the following specific steps:
(1) selecting an aluminum strip with the width same as the circumference of the inner ring of the circle correcting die 104, manually cutting 4-6 meters of the front end of the aluminum strip into a width smaller than the diameter of the circle correcting die by 4-6 centimeters, sequentially passing the cut part of the aluminum strip through a U-shaped gap 1003 between an upper roller and a lower roller of the first roll forming die 100 and the second roll forming die 101, and then sequentially passing through the first forming sheath 102, the second forming sheath 103 and the circle correcting die 104 to a belt tractor;
(2) starting a belt tractor 3, adjusting the air pressure of an air cylinder to be 8-15 MPa, enabling an upper conveying belt and a lower conveying belt on the tractor to compact an aluminum strip, adjusting the traction speed, and enabling the tractor to pull the aluminum strip for 8-12 m until a round surface is formed at the outlet of the tractor and is smooth, wherein the round surface reaches the hollow aluminum protective pipe required by design; in the traction process of the belt tractor, the aluminum belt is led to the central positions of the first rolling forming die 100, the second rolling forming die 101, the first forming sheath 102, the second forming sheath 103 and the rounding die 104 to be formed into the aluminum pipe by adjusting the front, back, left and right positions of the adjusting supports 107 of the first rolling forming die 100, the second rolling forming die 101, the first forming sheath 102, the second forming sheath 103 and the rounding die 104 on the adjusting base;
(3) loosening the air pressure of a cylinder 3 of the belt tractor, and cutting off the front aluminum strip at the outlet of the tractor, wherein the cut-off part comprises the length of 4-6 meters obtained after cutting in the step (1) and the length of 8-12 meters obtained after traction adjustment in the step (2); then, the cable core of the fireproof cable is placed above the aluminum belt and sequentially passes through the U-shaped grooves on the rollers of the first rolling forming die and the second rolling forming die, then sequentially passes through the first forming sheath 102, the second forming sheath 103 and the rounding die 104 and then is drawn to the outlet of the belt tractor 3, as shown in figure 1, and extends out of the cut surface of the forming aluminum pipe, then the head end of the forming aluminum pipe and the end of the fireproof cable core in the aluminum pipe are bundled together by using a steel wire, and the air pressure of an air cylinder of the belt tractor is opened to enable the conveying belt on the tractor to compact the aluminum pipe sheath covering the fireproof cable core and the cable core together;
(4) starting the argon arc welding machine 2, adjusting the welding current of the welding machine to be controlled at 45-75A and the welding speed to be 4-8 m/min, and adjusting the air pressure of an air cylinder of a belt tractor to ensure that the fireproof cable core with the aluminum pipe sheath cannot deform due to overlarge pressure in the process of being dragged again; in the traction process of the belt tractor 3, the seam of the aluminum pipe sheath which passes through the circle correcting die 104 and then covers the cable core is welded, and the diameter of the formed aluminum sheath is phi 15 mm-phi 100 mm.
The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. The utility model provides a fire prevention cable tubulose aluminium sheath molding system which characterized in that: the forming system comprises a forming device (1), an argon arc welding machine (2), a belt tractor (3) and a workbench (4) which are sequentially arranged on the same production line; the forming device comprises a support frame (105), an adjusting base (106), and a first rolling forming die (100), a second rolling forming die (101), a first forming sheath (102), a second forming sheath (103) and a circle correcting die (104) which are linearly and sequentially distributed on the adjusting base (106), wherein the adjusting base (106) is installed on the workbench (4) through the support frame (105), the first rolling forming die (100), the second rolling forming die (101), the first forming sheath (102), the second forming sheath (103) and the circle correcting die (104) are respectively installed on the adjusting base (106) through adjusting supports (107) and can be adjusted transversely and longitudinally along the adjusting base (106), and nut and thimble locking mechanisms (108) are respectively arranged at two ends of each adjusting support (107); the first rolling forming die (100) and the second rolling forming die (101) are both composed of an upper roller (1001) and a lower roller (1002), the first rolling forming die (100) and the second rolling forming die (101) are identical in structural size, a first U-shaped groove (1004) with the width larger than the diameter of the section of a cable core (5) by 4-7 mm is formed in the middle of the upper roller (1001) along the circumferential direction, a U-shaped groove matched with the roller body of the upper roller (1001) is formed in the middle of the lower roller (1002) along the circumferential direction, the roller body of the upper roller (1001) is arranged in the U-shaped groove of the lower roller (1002), and a U-shaped gap (1003) with the width matched with the wall thickness of the aluminum sheath sleeve is formed between the surface of the roller body of the upper roller (1001) and the inner groove surface of the U-shaped groove of the lower roller (1002); the inner cavities of the first forming sheath (102) and the second forming sheath (103) are both conical cavities with inlets larger than outlets, and the compression angle a of the inner conical surfaces is 3-5 degrees; the inlet part of the rounding die (104) is provided with a conical angle which is retracted from the inlet end to the outlet end; the inner diameters of the outlet end of the second forming sheath (103) and the outlet part of the circle correcting die (104) are equal and are the same as the outer diameter of the formed sheath; the argon arc welding machine (2) is arranged on the edge of the workbench (4) behind the circle correcting die (104), and the welding head (200) is arranged above the outlet part of the circle correcting die (104); the belt tractor (3) is arranged behind the argon arc welding machine (2) and comprises a belt conveyor support (300), an upper conveying belt (301), a lower conveying belt (302) and a transmission mechanism, a gap through which the forming protective sleeve passes is arranged between the upper conveying belt (301) and the lower conveying belt (302), and the gap and the central line of the forming device (1) are on the same straight line; the first rolling forming die (100), the second rolling forming die (101), the first forming sheath (102), the second forming sheath (103) and the circle correcting die (104) are all made of nylon MC901 bars.
2. A fire-resistant cable tubular aluminum sheath molding system as claimed in claim 1, wherein: the adjusting bracket (107) comprises a mounting base (1070) and two supporting plates (1071) symmetrically arranged on the mounting base (1070), first strip-shaped bolt grooves (1072) distributed along the length direction of the mounting base (1070) are respectively arranged at two ends of the mounting base (1070), second strip-shaped bolt grooves (1060) distributed along the width direction of the mounting base (1070) are symmetrically arranged on the adjusting base (106), the distribution length of the second strip-shaped bolt grooves (1060) extends from one end of the adjusting base (106) to the other end and is perpendicular to the first strip-shaped bolt grooves (1072) on each adjusting bracket (107), and the mounting base (1070) is mounted in the second strip-shaped bolt grooves (1060) of the adjusting base (106) through adjusting bolts (1073); the upper and lower rollers of the first rolling forming die (100) and the second rolling forming die (101) are respectively installed between two supporting plates (1071) of the corresponding adjusting bracket through rotating shafts, the first forming sheath (102) and the second forming sheath (103) are fixedly installed between the two supporting plates (1071) of the corresponding adjusting bracket through fixing hoops, and the circle correcting die (104) is installed between the two supporting plates (1071) of the corresponding adjusting bracket through an adjusting mechanism (1040); the center lines of the first forming sheath (102), the second forming sheath (103) and the rounding die (104) are on the same straight line.
3. A fire-resistant cable tubular aluminum sheath molding system according to claim 1 or 2, wherein: nut thimble locking mechanism (108) include L type latch segment (1080) and nut thimble (1081), the edge of adjustment base (106) is hugged closely in L type latch segment (1080) to fix locking through fixing bolt (1082), nut thimble (1081) passes the base of latch segment top tight regulation support (107) from the outside of L type latch segment (1080).
4. A fire-resistant cable tubular aluminum sheath molding system according to claim 1 or 2, wherein: the diameter of the outlet end of the first forming sheath (102) is larger than or equal to the inner diameter of the inlet end of the second forming sheath (103), and the diameter of the outlet end of the second forming sheath (103) is equal to the outer diameter of the forming aluminum sheath.
5. A fire-resistant cable tubular aluminum sheath molding system according to claim 1 or 2, wherein: the taper angle b of the inlet part of the rounding die (104) is 15 degrees; the circle checking aperture of the circle checking die (104) is Dmm, the thickness of the aluminum strip is h, the diameter D of the fireproof cable core is calculated by the following formula: d is 2 × h + D.
6. A fire-resistant cable tubular aluminum sheath molding system according to claim 1 or 2, wherein: the first rolling forming die (100), the second rolling forming die (101), the first forming sheath (102), the second forming sheath (103) and the circle correcting die (104) are respectively formed by processing Cr40 materials through adjusting brackets (107) and are subjected to modulation treatment and blackening rust prevention treatment; and a traction wheel (109) is arranged between the second rolling forming die (101) and the first forming sheath (102), and the traction wheel (109) is arranged on the adjusting base (106) through a traction bracket (110).
7. A method for forming a tubular aluminum sheath of a fireproof cable is characterized by comprising the following steps: the method uses the fireproof cable tubular aluminum sheath forming system of any one of claims 1 to 6 for forming, and comprises the following specific steps:
(1) manually cutting the position 4-6 m away from the front end of the prepared aluminum strip into a width 4-6 cm smaller than the diameter of the circle correcting die, sequentially passing the cut part of the aluminum strip through a U-shaped gap between an upper roller and a lower roller of the first rolling forming die and the second rolling forming die, sequentially passing through the first forming sheath, the second forming sheath and the circle correcting die, and then putting the cut part on a belt tractor;
(2) starting a belt tractor, adjusting air pressure of an air cylinder of the belt tractor to enable a conveying belt on the tractor to compact an aluminum strip, adjusting the traction speed to enable the tractor to pull the aluminum strip for 8-12 m until the appearance of a formed hollow aluminum protective pipe at the outlet of the tractor meets the design requirement; in the traction process of the belt tractor, the aluminum belt is led to the central positions of the first rolling forming die, the second rolling forming die, the first forming sheath, the second forming sheath and the circle correcting die to be formed into the aluminum pipe by adjusting the front, back, left and right positions of the adjusting supports of the first rolling forming die, the second rolling forming die, the first forming sheath, the second forming sheath and the circle correcting die on the adjusting base;
(3) loosening the air pressure of an air cylinder of the belt tractor, cutting off the front part of the aluminum belt at the outlet of the tractor, placing a cable core of the fireproof cable above the aluminum belt, sequentially passing through U-shaped grooves on rollers on a first rolling forming die and a second rolling forming die, sequentially passing through a first forming sheath, a second forming sheath and a rounding die, then drawing to the outlet of the belt tractor, extending out the cut surface of a formed aluminum pipe, bundling the head end of the formed aluminum pipe and the end of a core of the fireproof cable in the aluminum pipe by using a steel wire, and opening the air pressure of the air cylinder of the belt tractor to enable a conveying belt on the tractor to compact the aluminum pipe sheath and the cable core which are wrapped with the core of the fireproof cable together;
(4) starting the argon arc welding machine, adjusting the welding current and the welding speed of the welding machine, adjusting the air pressure of an air cylinder of the belt tractor, ensuring that the fireproof cable core with the aluminum pipe sheath cannot deform due to overlarge pressure in the traction process, and welding the seam of the aluminum pipe sheath which passes through the rounding die and then is coated outside the cable core in the traction process of the belt tractor.
8. The method of claim 7, wherein the method comprises the steps of: the thickness of the aluminum strip in the step (1) is 0.6-3.0mm, and the diameter of the formed aluminum sheath is phi 15 mm-phi 100 mm.
9. The method of claim 7, wherein the method comprises the steps of: the air pressure of an air cylinder of the belt tractor in the step (2) and the step (4) is 8-15 MPa; and (4) controlling the welding current of the argon arc welding machine in the step (4) to be 45-75A, and controlling the welding speed to be 4-8 m/min.
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| US3430330A (en) * | 1965-12-30 | 1969-03-04 | Gen Cable Corp | Method of making aluminum sheathed coaxial cable |
| CN209343860U (en) * | 2019-03-18 | 2019-09-03 | 沈兴线缆集团有限公司 | Oil well fireproof cable production sheath coating unit |
| CN210615738U (en) * | 2019-09-18 | 2020-05-26 | 广州珠江电缆有限公司 | Cable metal sheath wrapping welding production line |
| CN111952014A (en) * | 2020-09-02 | 2020-11-17 | 江苏亨通线缆科技有限公司 | Production system of aluminum sheath cable |
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2021
- 2021-05-18 CN CN202110539047.5A patent/CN113241225B/en active Active
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|---|---|---|---|---|
| US3430330A (en) * | 1965-12-30 | 1969-03-04 | Gen Cable Corp | Method of making aluminum sheathed coaxial cable |
| CN209343860U (en) * | 2019-03-18 | 2019-09-03 | 沈兴线缆集团有限公司 | Oil well fireproof cable production sheath coating unit |
| CN210615738U (en) * | 2019-09-18 | 2020-05-26 | 广州珠江电缆有限公司 | Cable metal sheath wrapping welding production line |
| CN111952014A (en) * | 2020-09-02 | 2020-11-17 | 江苏亨通线缆科技有限公司 | Production system of aluminum sheath cable |
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Effective date of registration: 20211022 Address after: 430058 no.536 houguanhu Avenue, Wuhan Economic and Technological Development Zone, Hubei Province Applicant after: AEROSPACE RICH CABLE Co.,Ltd. Applicant after: AEROSPACE ELECTRIC GROUP Co.,Ltd. Address before: 430058 no.536 houguanhu Avenue, Wuhan Economic and Technological Development Zone, Hubei Province Applicant before: AEROSPACE RICH CABLE Co.,Ltd. |
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