CN110993203A

CN110993203A - Preparation method of aluminum alloy cable

Info

Publication number: CN110993203A
Application number: CN201911342071.9A
Authority: CN
Inventors: 佟阳阳; 南赞峰; 程鹏
Original assignee: Zhejiang Chint Electric Cable Co ltd
Current assignee: Zhejiang Chint Electric Cable Co ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-04-10
Anticipated expiration: 2039-12-24
Also published as: CN110993203B

Abstract

The invention discloses a preparation method of an aluminum alloy cable, which effectively improves the shearing resistance of the cable and ensures certain flexibility by preparing a plurality of aluminum alloy sheaths which can be matched with each other and injecting a filler with the shearing hardening characteristic. The invention comprises the following production and assembly processes: stranding the conductors to form stranded wires and extruding the stranded wires to wrap the insulating layers to prepare cable cores; manufacturing a plurality of aluminum alloy sheaths in a machining mode; manufacturing a lantern ring according to the size of the outer wall of the aluminum alloy sheath; tightly arranging a plurality of cable cores, and inserting a limiting rod between the cable cores to form a cable core group; sleeving the lantern ring on the outer side of the aluminum alloy sheath, so that the lantern ring completely wraps the groove; injecting a filler with shear hardening characteristics into the groove on the outer side of the aluminum alloy sheath; and sleeving the aluminum alloy sheath on the assembled cable core, sequentially sleeving other aluminum alloy sheaths on the cable core, and clamping the aluminum alloy sheaths together in an extrusion manner.

Description

Preparation method of aluminum alloy cable

Technical Field

The invention relates to the field of cable production and manufacturing, in particular to a preparation method of an aluminum alloy cable.

Background

A cable is a conductor made of one or more conductors insulated from each other and an outer insulating sheath that carries power or information from one location to another. The cables are generally erected aloft or buried underground and used for long-distance high-voltage power transmission, and each cable is generally responsible for power transmission of a plurality of strands of lines, so that the transmission efficiency is high, the manufacturing cost is low, and the stability is good.

The insulating protective layer of the cable erected in the high altitude is easy to reduce in strength due to oxidation because of long-term contact with air, and when severe weather or other external forces occur, the cable is easy to break, so that internal circuits are disconnected, and economic loss and safety problems are caused; the cables buried underground are damaged by construction or some illegal activities, and particularly during the construction of an excavator, the consequence of breaking the cables is easily caused under the condition that the distribution of the underground cables is not known in advance, so that the breakdown of a power system is caused.

At present, the aluminum alloy cable for resisting shearing is mainly characterized in that a metal sleeve (a metal sleeve outside an anti-explosion hose similar to a bathroom) is additionally arranged outside the cable and can resist the damage of partial external force, but the metal sleeve is thin in outer wall, can be damaged and deformed when being severely impacted and is difficult to rebound, so that the sleeve extrudes an inner cable core, and the cable core is damaged.

Once the cable is damaged, huge economic loss is caused, great inconvenience is brought to life of people, the maintenance difficulty is high, the period is long, the existing common cable is poor in shearing resistance and is easy to break under external force; the shearing force of the existing aluminum alloy cable is greatly improved, most conditions can be met, the probability of cable breakage is reduced, and the aluminum alloy cable still cannot play an effective protection role when meeting an excavator or other large-scale machines.

Therefore, how to improve the shear resistance and the breakage resistance of the cable is one of the problems to be solved in the field of cable manufacturing at present.

Disclosure of Invention

The invention aims to provide a preparation method of an aluminum alloy cable, which effectively improves the shearing resistance of the cable and ensures certain flexibility by preparing a plurality of aluminum alloy sheaths which can be matched with each other and injecting a filler with shearing hardening property.

In order to realize the purpose of the invention, the invention adopts the following technical scheme: the preparation method of the aluminum alloy cable core comprises the following production and assembly processes:

1) preparing a cable core: stranding the multiple conductors to form uniform and compact stranded wires; extruding and insulating: an insulating layer is extruded on the outer side of the conductor stranded wire;

2) processing an aluminum alloy sheath: manufacturing a plurality of aluminum alloy sheaths in a machining mode, wherein the size of the inner wall of each aluminum alloy sheath is matched with that of a cable core to be wrapped, grooves are formed in the outer sides of the aluminum alloy sheaths, two end parts of each aluminum alloy sheath are processed into annular protruding parts and clamping grooves, and the height of each clamping groove is larger than the width of each protruding part;

3) preparing accessories: manufacturing a lantern ring according to the size of the outer wall of the aluminum alloy sheath;

4) cable core assembly: closely arranging a plurality of cable cores subjected to extrusion insulation, inserting a limiting rod between the cable cores, and enabling the limiting rod to be tightly attached to the outer wall of each cable core and isolating each cable core to form a cable core group;

5) assembling a lantern ring: sleeving the lantern ring on the outer side of the aluminum alloy sheath, so that the lantern ring completely wraps the groove;

6) filling material injection: filling the filler with the shear hardening characteristic into the groove on the outer side of the aluminum alloy sheath through the gap between the groove and the lantern ring;

7) assembling an aluminum alloy sheath: the aluminum alloy sheath is sleeved on the assembled cable core, the inner wall of the aluminum alloy sheath is attached to the cable core, a plurality of other aluminum alloy sheaths are sequentially sleeved on the cable core, the protruding portion of the aluminum alloy sheath is embedded into the clamping groove of the other aluminum alloy sheath in an extruding mode, and a gap for swinging of the two aluminum alloy sheaths is reserved between the clamping groove and the protruding portion.

Compared with the prior art, the preparation method of the aluminum alloy cable core adopting the technical scheme has the following beneficial effects:

according to the preparation method of the aluminum alloy cable core, in the aluminum alloy sheath processing procedure, the plurality of aluminum alloy sheath jackets have the same appearance and structure, batch production can be carried out, and the aluminum alloy sheaths can be matched with one another, so that the shearing resistance of the sheaths is ensured, a certain movable space is provided for cables, and the flexibility of the cables is enhanced.

Secondly, the recess of aluminum alloy sheath side is used for pouring into the filler of shear hardening characteristic, and the filler can harden rapidly when receiving violent external force to resist external force's destruction, guarantee that the aluminum alloy sheath does not take place deformation, thereby guarantee that inside cable core does not receive the damage.

And thirdly, the lantern ring can completely wrap the groove to avoid the filler in the groove from leaking.

As a further preferable scheme of the scheme, in the step 2), two end parts of the aluminum alloy sheath are further provided with limiting holes, the limiting holes extend into the grooves, and the limiting holes penetrate through the grooves to the two end parts; in the step 3), a limiting block and a limiting column are also prepared. The limiting columns are inserted into the limiting holes of the aluminum alloy sheaths connected with each other, so that mutual rotation between the aluminum alloy sheaths can be avoided, and the cable core is prevented from being distorted and broken.

And 6) before the filler is injected, penetrating the limiting column into the limiting holes of the two adjacent aluminum alloy sheaths to enable the two ends of the limiting column to be positioned in the grooves of the two adjacent aluminum alloy sheaths, fixing the limiting blocks to the two ends of the limiting column, and then injecting the filler.

Preferably, the two ends of the limiting column are provided with internal threads, the limiting block is provided with a screw hole, and the limiting block is fixed at the two ends of the limiting column in a bolt tightening mode, so that the limiting block can be mounted on and dismounted from the limiting column.

Preferably, in the step 5), the lantern ring is made of a thermal expansion material, the inner diameter of the lantern ring is enlarged by heating the lantern ring, the lantern ring is sleeved on the groove and then is rapidly filled with the filler, and then the filler is naturally cooled and reduced to close the groove. When the lantern ring made of metal or other stable materials is adopted, the lantern ring is difficult to sleeve into the groove, and when the lantern ring is sleeved on the groove, the groove is basically in a completely sealed state, so that fillers are difficult to inject into the groove. And the inner diameter of the lantern ring made of the thermal expansion material is expanded when the lantern ring is heated, the lantern ring can be easily sleeved on the groove, the filler is injected from the gap, after the lantern ring is cooled and contracted, the groove can be sealed, and the filler is prevented from leaking.

Preferably, the limiting block is provided with a plurality of blocking pieces on the outer side, and the upper parts of the blocking pieces are further provided with annular baffles which are perpendicular to the blocking pieces. The effectual stopper and the filler area of contact that has improved, when the stopper produced the small-amplitude removal, the filler begins the solidification sclerosis, blocks the stopper, avoids two sections aluminum alloy sheaths to take place the swing in the short time and breaks away from.

Preferably, in step 6), the filler is P4U or D3O material, the filler is slowly injected into the groove by a grouting machine, and then the hardened material is injected, wherein the P4U material and the D3O material are silicone high polymer, are non-newtonian fluids, are viscous fluids when subjected to a small external force, and are beneficial to being injected into the groove 22, and the fluids are suddenly hardened to resist damage caused by the external force when suddenly subjected to a large external force.

Drawings

Fig. 1 is a schematic structural diagram of a cable core in the embodiment of the invention.

Fig. 2 is a partially enlarged schematic view of the cable core in this embodiment.

Fig. 3 is a schematic structural diagram of the aluminum alloy sheath in this embodiment.

Fig. 4 is a schematic structural view of the collar in this embodiment.

Fig. 5 is a schematic structural view of the limiting rod in the embodiment.

Fig. 6 is a schematic structural diagram of the limiting column and the limiting block in this embodiment.

Fig. 7 is a schematic structural view of the cable core assembly in this embodiment.

Fig. 8 is a schematic view showing an assembly manner of the collar and the stopper rod in the present embodiment.

Fig. 9 is a schematic view of an assembly manner of the aluminum alloy sheath in this embodiment.

Fig. 10 is a partial sectional view showing the assembly of the aluminum alloy sheath according to the present embodiment.

Reference numerals: 1. a cable core; 10. stranding; 11. an insulating layer; 2. an aluminum alloy sheath; 20. a projection; 21. a card slot; 22. a groove; 23. a limiting hole; 24. a wire slot; 3. a collar; 4. a limiting rod; 5. a limiting column; 6. a limiting block; 60. a baffle plate.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The preparation method of the aluminum alloy cable comprises the following production and assembly processes:

1) preparing a cable core 1: as shown in fig. 1 and 2, multiple conductors are stranded to form uniform and compact stranded wires 10, the stranded wires 10 are subjected to extrusion insulation, and an insulation layer 11 is extruded on the outer sides of the conductor stranded wires 10.

2) And (3) processing the aluminum alloy sheath 2: as shown in fig. 3, a plurality of aluminum alloy sheaths 2 are manufactured in a machining mode, three wire grooves 24 are reserved on the inner walls of the aluminum alloy sheaths 2, and the size of each wire groove 24 is matched with the size of the cable core 1 to be wrapped; a groove 22 is formed in the outer side of the aluminum alloy sheath 2, the groove 22 is located between two adjacent wire grooves 24, and the groove 22 is located in the outer side wall of the aluminum alloy sheath 2; two end parts of the aluminum alloy sheath 2 are processed into an annular convex part 20 and a clamping groove 21, the height of the clamping groove 21 is larger than the width of the convex part 20, and the convex part 20 can be embedded into the clamping groove 21 and a certain gap is reserved, so that the aluminum alloy sheaths 2 can swing mutually; three limiting holes 23 are formed in two end portions of the aluminum alloy sheath 2, the limiting holes 23 extend into the grooves 22, and the limiting holes 23 penetrate through the grooves 22 towards the two end portions.

3) Preparing accessories: as shown in fig. 4, the lantern ring 3 is made according to the size of the outer wall of the aluminum alloy sheath 2, the lantern ring 3 is made of a thermal expansion material, the inner diameter of the lantern ring 3 made of the thermal expansion material is expanded when being heated, the lantern ring can be easily sleeved on the groove 22, filler is injected from a gap, and after the lantern ring is cooled and contracted, the groove 22 can be sealed, so that the filler is prevented from leaking;

as shown in fig. 5 and 6, a limiting block 6 and a limiting column 5 are prepared, a plurality of blocking pieces 60 are arranged on the outer side of the limiting block 6, round holes for screws to pass through are reserved in the limiting block 6, and an annular baffle is further arranged on the upper portions of the blocking pieces 60 and is perpendicular to the blocking pieces 60; screw holes are formed in two ends of the limiting column 5, and the limiting block 6 can be fixed to two ends of the limiting column 5 through screws.

4) Assembling the cable core 1: as shown in fig. 7, a plurality of cable cores 1 subjected to extrusion insulation are closely arranged, a limiting rod 4 is inserted between the cable cores 1, the limiting rod 4 is tightly attached to the outer wall of the cable core 1 and separates each cable core 1, so as to form a cable core 1 group.

5) Assembling the limiting column 5: the two limiting holes 23 in the aluminum alloy sheaths 2 to be connected are aligned, then the limiting columns 5 penetrate into the limiting holes 23, the two ends of each limiting column 5 are located in the grooves 22 of the two aluminum alloy sheaths 2, and then the limiting blocks 6 are fixed at the two ends of the limiting rod 4.

6) Assembling the lantern ring 3: as shown in fig. 8, the collar 3 is heated to expand and increase the inner diameter, and at this time, the collar 3 is fitted over the outer side of the aluminum alloy sheath 2 so that the collar 3 completely covers the groove 22.

7) Hot melting and shaping: the assembled aluminum alloy cable is externally compressed and clamped by a clamp, the aluminum alloy cable is transferred into a heating device and heated for 2 hours at the temperature of 60-100 ℃, the limiting rod 4 is made of EVA materials, the limiting rod 4 is foamed after being heated and thermally melted to expand, gaps among the cable cores 1 are filled, so that the cable cores 1 are kept cylindrical, and the cable cores 1 are prevented from being extruded by external force to cause the deformation of the cable cores 1 to gaps, and further, the conductive wires in the cable cores 1 are dislocated and deformed to cause the breakage of the insulating rubber outside the cable cores 1.

8) Pretreatment of the filler: the filler of P4U material was added to the AC-1300 foaming agent, stirred well and then the magnesium oxide powder and hardening phthalate were added to cause the filler to foam and start to cure.

9) Filling material injection: the filler in foaming and gradually solidifying is slowly injected into the groove 22 on the outer side of the aluminum alloy sheath 2 through the gap between the lantern ring 3 and the groove 22, then is naturally cooled and contracted by the lantern ring 3 until the lantern ring 3 completely seals the groove 22, the filler in foaming and solidifying can buffer part of impact force from the outside, the aluminum alloy sheath 2 is protected from being damaged, the displacement of the limiting column 5 can be limited, and the buffer is provided between the two adjacent aluminum alloy sheaths 2.

10) Assembling the aluminum alloy sheath 2: as shown in fig. 9 and 10, a plurality of aluminum alloy sheaths 2 are sequentially sleeved on the assembled cable core 1 group, the inner walls of the aluminum alloy sheaths 2 are attached to the cable core 1, the protruding portion 20 of one aluminum alloy sheath 2 is embedded into the clamping groove 21 of the other aluminum alloy sheath 2 in an extruding manner, and a gap for swinging of the two aluminum alloy sheaths 2 is reserved between the clamping groove 21 and the protruding portion 20.

When the aluminum alloy cable receives external force extrusion and takes place the swing, the swing of buckling (even when the protruding portion and the draw-in groove 21 of the aluminum alloy sheath 2 in the outside are about to break away from) takes place for adjacent aluminum alloy sheath 2, two spacing hole 23 interval grow that are located the outside, this moment because stopper 6 is shortening with spacing hole 23 interval, stopper 6 relative filler is moving, and a large amount of separation blade 60 of stopper 6 surface setting, then effectual stopper 6 and filler area of contact have improved, when stopper 6 produces the small-amplitude removal, the filler begins the solidification sclerosis, block stopper 6, avoid two sections aluminum alloy sheaths 2 to take place the swing in the short time and break away from.

The foregoing is a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims

1. The preparation method of the aluminum alloy cable is characterized by comprising the following production and assembly processes:

1) preparing a cable core: stranding a plurality of conductors to form a uniform and compact stranded wire (10), and extruding an insulating layer (11) on the outer side of the stranded wire (10);

2) processing an aluminum alloy sheath: manufacturing a plurality of aluminum alloy sheaths (2) in a machining mode, wherein the size of the inner wall of each aluminum alloy sheath (2) is matched with that of a cable core (1) to be wrapped, grooves (22) are formed in the outer sides of the aluminum alloy sheaths (2), two end parts of each aluminum alloy sheath (2) are processed into annular protruding parts (20) and clamping grooves (21), and the height of each clamping groove (21) is larger than the width of each protruding part (20);

3) preparing accessories: manufacturing a lantern ring (3) according to the size of the outer wall of the aluminum alloy sheath (2);

4) cable core assembly: tightly arranging a plurality of cable cores (1) which are extruded and insulated, inserting limiting rods (4) between the cable cores (1), wherein the limiting rods (4) are tightly attached to the outer wall of the cable cores (1) and isolate each cable core (1) to form a cable core group;

5) assembling a lantern ring: sleeving the lantern ring (3) on the outer side of the aluminum alloy sheath (2) to enable the lantern ring (3) to completely wrap the groove (22);

6) filling material injection: filling the filler with the shear hardening characteristic into the groove (22) on the outer side of the aluminum alloy sheath (2) through the gap between the groove (22) and the lantern ring (3);

7) assembling an aluminum alloy sheath: the aluminum alloy sheath (2) is sleeved on the assembled cable core (1), the inner wall of the aluminum alloy sheath (2) is attached to the cable core (1), other aluminum alloy sheaths (2) are sequentially sleeved on the cable core (1), the protruding portion (20) of the aluminum alloy sheath (2) is embedded into the clamping groove (21) of the other aluminum alloy sheath (2) in an extruding mode, and a gap for swinging of the two aluminum alloy sheaths (2) is reserved between the clamping groove (21) and the protruding portion (20).

2. The method for producing an aluminum alloy cable according to claim 1, wherein:

in the step 2), limiting holes (23) are formed in two end parts of the aluminum alloy sheath (2), the limiting holes (23) extend into the grooves (22), and the limiting holes (23) penetrate through the grooves (22) to the two end parts;

in the step 3), a limiting block (6) and a limiting column (5) are also prepared;

before the lantern ring assembly in the step 5) and the filler in the step 6) are injected, the limiting column (5) penetrates through the limiting holes (23) of the two adjacent aluminum alloy sheaths (2), the two ends of the limiting column (5) are located in the grooves (22) of the two adjacent aluminum alloy sheaths (2), the lantern ring (3) is assembled after the limiting block (6) is fixed to the two ends of the limiting column (5), and finally the filler is injected.

3. The method for producing an aluminum alloy cable according to claim 2, wherein: internal threads are arranged at two ends of the limiting column (5), screw holes are formed in the limiting block (6), and the limiting block (6) is fixed at two ends of the limiting column (5) in a bolt tightening mode.

4. The method for producing an aluminum alloy cable according to claim 1, wherein: in the step 5), the lantern ring (3) is made of thermal expansion materials, the inner diameter of the lantern ring (3) is firstly heated to be enlarged, the lantern ring (3) is sleeved on the groove (22) and then is rapidly filled with fillers, and then the filler is naturally cooled to be reduced, so that the groove (22) is closed.

5. The method for producing an aluminum alloy cable according to claim 3, wherein: a plurality of baffle plates (60) are arranged on the outer side of the limiting block (6), an annular baffle plate is further arranged on the upper portion of each baffle plate (60), the annular baffle plate is perpendicular to the baffle plates (60), and the baffle plates (60) are evenly arranged along the circumferential direction of the annular baffle plate.

6. The method for producing an aluminum alloy cable according to claim 5, wherein: the surfaces of the annular baffle plate and the baffle plate (60) of the limiting block (6) are provided with a frosting layer, scratches or a large amount of burrs.

7. The method for producing an aluminum alloy cable according to claim 1, wherein: in the step 6), the filler is P4U or D3O material, the filler is slowly injected into the groove (22) by a grouting machine, and then the hardening material is injected.

8. The method for producing an aluminum alloy cable according to claim 7, wherein: the filler is also provided with a foaming material, the foaming material is prepared from an AC-1300 foaming agent and magnesium oxide, the AC-1300 foaming agent and the filler are fully stirred and dissolved, the magnesium oxide is added, and the foamed filler is injected into the groove (22).

9. The method for producing an aluminum alloy cable according to claim 8, wherein: the hardening material is phthalate which generates a chemical combination reaction with the AC-1300 foaming agent in the foaming material, so that the foamed filler is hardened.