CN109616849B - Method for butt joint and aluminum embedding of 19 stranded steel strands of overhead conductor - Google Patents
Method for butt joint and aluminum embedding of 19 stranded steel strands of overhead conductor Download PDFInfo
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- CN109616849B CN109616849B CN201910019393.3A CN201910019393A CN109616849B CN 109616849 B CN109616849 B CN 109616849B CN 201910019393 A CN201910019393 A CN 201910019393A CN 109616849 B CN109616849 B CN 109616849B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
- H01R43/048—Crimping apparatus or processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
- H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
- H01R4/183—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
- H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
- H01R4/20—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping using a crimping sleeve
Abstract
The invention discloses a method for butt joint aluminum-embedded compression joint of 19 stranded steel wires of overhead conductors, which comprises a steel pipe (1) and an aluminum alloy pipe (2), wherein the aluminum alloy pipe (2) is embedded into the steel pipe (1) and wraps the two butt joint circular wire concentric stranded overhead conductors with 19 stranded steel wires (3), and the steel pipe (1) is compressed to ensure that the aluminum alloy pipe (2) is tightly attached to the circular wire concentric stranded overhead conductors with 19 stranded steel wires (3) to form a steel core connecting pipe. According to the invention, the layer of aluminum alloy pipe is added between the steel pipe and the 19 stranded steel wires of the round wire concentric stranded overhead conductor, the phenomena of crushing, undervoltage and strand loosening of the 19 stranded steel wires of the round wire concentric stranded overhead conductor when the steel pipe and the 19 stranded steel wires of the round wire concentric stranded overhead conductor are crimped are avoided by utilizing the high shaping and high static friction coefficient of the aluminum alloy pipe, and meanwhile, the gripping force requirement of the joint is met, so that the butt-joint crimping of the 19 stranded steel wires of the round wire concentric stranded overhead conductor is easier to implement, the crimping quality is higher, the crimping joint can avoid nondestructive detection, and the labor intensity and the engineering cost are reduced.
Description
Technical Field
the invention belongs to the technical field of compression joint of 19 stranded steel strands of a circular concentric stranded overhead conductor, and particularly relates to a compression joint method for butt joint of 19 stranded steel strands of an overhead conductor and embedding aluminum.
Background
in the traditional process of splicing the overhead conductors and the ground wires in the power transmission and transformation project, the joints of 19 stranded steel strands of galvanized round wire concentric stranded overhead conductors (or 19 stranded steel strands of aluminum-clad round wire concentric stranded overhead conductors) of steel-cored aluminum strands and the ground wires are all hydraulically connected by directly sheathing the 19 stranded steel strands of round wire concentric stranded overhead conductors with steel pipes, if the steel pipes are not matched with the 19 stranded steel strands of round wire concentric stranded overhead conductors in hardness, the size of a crimping die is unreasonable, the crimping pressure is insufficient, the defects of undervoltage, strand loosening, overvoltage, steel wire surface damage and the like are easy to occur, and the holding force of the joints is not satisfied with the standard requirement. In the defect of crimping of 19 stranded steel wires of a round wire concentric stranded overhead conductor of a steel-cored aluminum stranded wire and a ground wire, hardness mismatching of a steel pipe and the 19 stranded steel wires of the round wire concentric stranded overhead conductor cannot be avoided, in the production process of the 19 stranded steel wires of the aluminum-clad round wire concentric stranded overhead conductor, a cold-drawn steel wire penetrates through liquid aluminum for aluminizing, tempering is equivalently done once, the hardness of the cold-drawn steel wire is reduced, the hardness of the 19 stranded steel wires of the round wire concentric stranded overhead conductor is lower than that of the steel pipe, the inner wall of the steel pipe bites the 19 stranded steel wires of the round wire concentric stranded overhead conductor during crimping, and the holding force of a joint is reduced.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method for butt-jointing, embedding and aluminum crimping of 19 stranded steel strands of an overhead conductor can solve the technical problems in the prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a 19 hank steel strand wires of overhead conductor butt joint inlay aluminium crimping method, this method includes butt joint inlay aluminium crimping structure, its structure includes steel pipe and aluminum alloy pipe, the aluminum alloy pipe is embedded into the steel pipe to wrap up two butt joint circle line concentric hank overhead conductor 19 hank steel strand wires, the crimping steel pipe makes the aluminum alloy pipe closely laminate the concentric 19 hank steel strand wires of hank overhead conductor wire of circle line and form the steel core splicing sleeve, steel pipe and aluminum alloy pipe length are the same, be two steel core strand wire pitches, this crimping method includes the following step:
1) embedding an aluminum alloy pipe into the steel pipe;
2) Inserting the 19 stranded steel strands of the two butted circular wire concentric stranded overhead conductors from two ends of an aluminum alloy pipe, and ensuring that the insertion depths of the 19 stranded steel strands of the two circular wire concentric stranded overhead conductors are equal;
3) adopting a crimping die to crimp the steel pipe, so that the aluminum alloy pipe is tightly attached to the surfaces of the 19 stranded steel strands of the round wire concentric stranded overhead conductor and gaps among the 19 stranded steel strands of the steel pipe and the round wire concentric stranded overhead conductor are filled to form a steel core splicing sleeve;
Thickness and length of aluminum tube:
(1) aluminum material quantity S between 19 stranded steel stranded wires of steel core splicing sleeve embedded into round wire concentric stranded overhead conductor after compression molding
In the formula (15)
r-steel core strand wire radius.
(3) thickness of aluminium tube required for embedding
In formula (16)
r-steel core strand wire radius.
The thickness of the embedded aluminum pipe is deltaal
δal＝δq+1(mm) (17)
(3) outer diameter D of embedded aluminum pipealis composed of
Dal＝10r+1+2δal(mm) (18)
in the formula (18)
r-steel core strand wire radius.
The length of the aluminum alloy pipe (2) is two steel core strand pitches.
The compression joint stress after the compression joint of the compression joint die for the steel pipe is as follows: when the press is not stopped after the steel core splicing sleeve is pressed and formed, the inner radius of the steel pipe is rfeThe center thickness of the steel pipe is dfeThe pitch diameter of the steel core strand thread is d2of aluminumThe thickness of the middle diameter of the pipe is dal；
According to the relation between the true stress sigma and the true strain epsilon of the material
σ＝Eε (8)
in the formula (8), E < - > is the Young modulus of the material;
After the press machine is stopped and moved away after the steel core splicing sleeve is subjected to compression joint forming, assuming that the compressive stress of the aluminum pipe wall is sigma1Inner radius of steel pipefe+ΔrfeThe center thickness of the steel pipe is dfe+ΔdfeThe radius of the pitch diameter circle of the steel core stranded wire thread is R + delta R, and the pitch diameter thickness of the aluminum pipe is dal+Δdal
After the pressure of the press machine is relieved after the steel core splicing sleeve is formed by compression joint, each thickness increment relation is
Δrfe-ΔR＝Δdal (12)
After the pressure of the press machine is relieved after the steel core splicing sleeve is pressed and formed, the compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe is
In formula (14):
σ1after the steel core splicing sleeve is formed by compression, the pressure of the press is relieved,
Compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
Sigma-before the pressure of a press is released after the steel core splicing sleeve is pressed and formed,
Compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
rfe-the internal radius of the steel tube after crimping;
R-steel core strand thread pitch diameter d2Half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
EalYoung's modulus of aluminum alloys.
thickness delta of steel pipefeIs composed of
in the formula (20)
Fb-calculating the breaking force of the wire (or ground);
σsfe-steel pipe yield strength;
Dal-the external diameter of the intercalated aluminium tube.
the outer diameter of the steel pipe is
Dfe＝Dal+2δfe (21)。
the crimping die is as follows:
cross sectional area of crimping
steel core crimping cross-sectional area sx
in the formula (22)
r-steel core strand wire radius.
Section s of embedded aluminum tubeqIs composed of
In the formula (23)
Dal-the external diameter of the intercalated aluminium tube;
r-steel core strand wire radius.
cross-sectional area s of steel pipegIs composed of
In the formula (24)
Dfe-the outside diameter of the steel pipe;
Dal-the external diameter of the intercalated aluminium tube.
Crimping die crimping cross-sectional area syIs composed of
sy＝sx+sq+sg (25)
The side length alpha of the regular hexagon pressing die is
The diagonal b of the regular hexagonal pressing die is
b＝a+2acos60°＝2a (27)
the safe working temperature range after the steel core splicing sleeve is formed by compression joint is as follows:
assuming that the environmental temperature is t when the splicing sleeve is installed0The linear expansion coefficient of the steel core and the steel pipe is afeThe coefficient of expansion of the embedded aluminum pipeline is aalWhen the operating temperature is t1Time of flight
radial expansion of steel core
ΔRt＝Rafe(t1-t0) (28)
expansion amount of embedded aluminum pipe
Δdalt＝dalaal(t1-t0) (29)
expansion of inner diameter of steel pipe
Δrfet＝rfeafe(t1-t0) (30)
Safety temperature
when the temperature rises:
Namely, the increase of the running temperature of the splicing sleeve is met
In the formula (32)
σ1After the steel core splicing sleeve is formed by compression, the pressure of the press is relieved,
compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
sigma-before the pressure of a press is released after the steel core splicing sleeve is pressed and formed,
compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
rfe-the internal radius of the steel tube after crimping;
r-steel core strand thread pitch diameter d2half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
Eal-young's modulus of the aluminium alloy;
afe-coefficient of linear expansion of steel;
aal-coefficient of linear expansion of aluminium;
When the temperature is reduced:
Namely the reduction of the operation temperature of the splicing sleeve is satisfied
In the formula (34)
Fb-calculating the breaking force of the wire (or ground);
σ1After the copper core splicing sleeve is formed by crimping, the pressure of the press is released,
compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe;
after the sigma-copper core splicing sleeve is formed by compression joint, before the pressure of a press is released,
compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe;
rfe-the internal radius of the steel tube after crimping;
R-steel core strand thread pitch diameter d2half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
Eal-young's modulus of the aluminium alloy;
r-radius of steel wire of steel core strand;
afe-coefficient of linear expansion of steel;
aalThe linear expansion coefficient of aluminum.
the invention has the beneficial effects that: compared with the prior art, the layer of aluminum alloy pipe is added between the steel pipe and the 19 stranded steel strands of the round wire concentric stranded overhead conductor, the phenomena of crushing, undervoltage and strand loosening of the 19 stranded steel strands of the round wire concentric stranded overhead conductor when the steel pipe and the 19 stranded steel strands of the round wire concentric stranded overhead conductor are crimped are avoided by utilizing the high shaping and high static friction coefficient of the aluminum alloy pipe, and meanwhile, the requirement of holding force of the joint is met, so that the butt-joint crimping of the 19 stranded steel strands of the round wire concentric stranded overhead conductor is easier to implement, the crimping quality is higher, the crimping joint can avoid nondestructive detection, and the labor intensity and the engineering cost are reduced.
drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the structure of the present invention;
FIG. 3 is a schematic diagram of the post-crimping structure of the present invention;
FIG. 4 is a simplified model diagram of 19 stranded steel strands of a round wire concentric stranded overhead conductor;
fig. 5 is a schematic longitudinal section view of 19 stranded steel strands of the round wire concentric stranded overhead conductor.
Detailed Description
the invention is further described with reference to the accompanying drawings and specific embodiments.
example 1: the utility model provides a 19 hank steel strand wires of overhead conductor butt joint inlay aluminium crimping method, this method includes butt joint inlay aluminium crimping structure, its structure includes steel pipe 1 and aluminum alloy pipe 2, aluminum alloy pipe 2 is embedded into steel pipe 1 to wrap up two butt joint 19 hank steel strand wires of circle line concentric hank overhead conductor 3, crimping steel pipe 1 makes aluminum alloy pipe 2 closely laminate 19 hank steel strand wires of circle line concentric hank overhead conductor 3 and form the steel core continuation pipe, steel pipe 1 and 2 length of aluminum alloy pipe are the same, be two steel core strand wires pitch, this method includes the following step:
1) embedding an aluminum alloy pipe into the steel pipe;
2) Inserting the 19 stranded steel strands of the two butted circular wire concentric stranded overhead conductors from two ends of an aluminum alloy pipe, and ensuring that the insertion depths of the 19 stranded steel strands of the two circular wire concentric stranded overhead conductors are equal;
3) adopting a crimping die to crimp the steel pipe, so that the aluminum alloy pipe is tightly attached to the surfaces of the 19 stranded steel strands of the round wire concentric stranded overhead conductor and gaps among the 19 stranded steel strands of the steel pipe and the round wire concentric stranded overhead conductor are filled to form a steel core splicing sleeve;
Thickness and length of aluminum tube:
(1) Aluminum material amount s between 19 stranded steel stranded wires of steel core splicing sleeve embedded into round wire concentric stranded overhead conductor after being compression-molded
In the formula (15)
r-steel core strand wire radius.
(4) Thickness of aluminium tube required for embedding
in formula (16)
r-steel core strand wire radius.
the thickness of the embedded aluminum pipe is deltaal
δal＝δq+1(mm) (17)
(3) Outer diameter D of embedded aluminum pipealis composed of
Dal＝10r+1+2δal(mm) (18)
in the formula (18)
r-steel core strand wire radius.
the length of the aluminum alloy pipe (2) is two steel core strand pitches.
the novel circular concentric stranded overhead conductor 19 stranded steel stranded wires are in butt joint with an embedded aluminum compression joint pipe, which is composed of an outer layer steel pipe and an inner layer aluminum alloy pipe, and is shown in figure 1. The outer steel pipe provides the concentric 19 hank steel strand wires of stranded overhead conductor of circle line main tension resistance and joint pressure of butt joint, and the inlayer aluminum alloy pipe provides steel wire embedding filler material (see figure 2), utilizes the high static friction coefficient of aluminum alloy to change joint pressure into tension resistance, improves the power of holding of joint (see figure 3).
Because the inner layer aluminum alloy pipe hardness is low, can not press 19 hank steel strands of the concentric hank air wire of round wire, as long as the mould matches with the crimping pipe, under-voltage, pine strand phenomenon can not appear in the crimping head, can need not carry out nondestructive test to the crimping head.
Crimp tube inlay aluminum tube counting
1. the pitch diameter of the steel core strand is d2Computing
According to the definition of the screw thread parameters, the pitch diameter d of the screw thread2Commonly used for geometric calculations, is the diameter of an imaginary cylinder whose generatrix has equal widths of the tooth-like troughs and projections. The pitch diameter of the steel core strand thread is d2The diameter of the great circle O in fig. 4 has a radius R, and for a steel core strand of 19 steel wires, the arc length of the intersection of the circle O and the circle P is equal to 1/24 of the circumference of the circle O.
I.e. theta
(1) In the formula
R-steel core strand thread pitch diameter d2Half of (1);
theta is half of the arc angle of the pitch diameter of the steel core stranded wire thread cut by the outer layer steel wire.
Equation of circle O of
x2+y2＝R2 (2)
x＝Rcosθ (3)
y＝Rsinθ (4)
Equation of circle P of
(x-4r)2+y2＝r2 (5)
(5) in the formula
r-steel core strand wire radius.
Using the above five equations to form a system of equations
R＝4.785r (6)
namely, it is
d2＝9.57r (7)
2. Crimp stress calculation
when the press is not stopped after the steel core splicing sleeve is pressed and formed, as shown in figure 4, the inner radius of the steel pipe is rfethe center thickness of the steel pipe is dfeThe pitch diameter of the steel core strand thread is d2the thickness of the middle diameter of the aluminum pipe is dal。
according to the relation between the true stress sigma and the true strain epsilon of the material
σ＝Eε (8)
(8) In the formula
E- -is the Young's modulus of the material
after the press machine is stopped and moved away after the steel core splicing sleeve is subjected to compression joint forming, assuming that the compressive stress of the aluminum pipe wall is sigma1inner radius of steel pipefe+ΔrfeThe center thickness of the steel pipe is dfe+Δdfethe radius of the pitch diameter circle of the steel core stranded wire thread is R + delta R, and the pitch diameter thickness of the aluminum pipe is dal+Δdal。
After the pressure of the press machine is relieved after the steel core splicing sleeve is formed by compression joint, the thickness increment relations are
Δrfe-ΔR＝Δdal (12)
after the pressure of the press machine is relieved after the steel core splicing sleeve is pressed and formed, the compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe is
In formula (14)
σ1after the steel core splicing sleeve is formed by compression, the pressure of the press is relieved,
Compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
Sigma-before the pressure of a press is released after the steel core splicing sleeve is pressed and formed,
compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
rfe-the internal radius of the steel tube after crimping;
r-steel core strand thread pitch diameter d2half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
Ealyoung's modulus of aluminum alloys.
3. calculation of embedded aluminium tube
(1) aluminum material quantity S between 19 stranded steel stranded wires of steel core splicing sleeve embedded into round wire concentric stranded overhead conductor after compression molding
in the formula (15)
r-steel core strand wire radius.
(5) Thickness of aluminium tube required for embedding
In formula (16)
r-steel core strand wire radius.
The thickness of the embedded aluminum pipe is deltaal
δal＝δq+1(mm) (17)
(3) Outer diameter D of embedded aluminum pipealIs composed of
Dal＝10r+1+2δal(mm) (18)
In the formula (18)
r-steel core strand wire radius.
(4) Embedding layer aluminum pipe material:
According to the yield strength and the oxidation resistance of the aluminum alloy, the embedded layer aluminum pipe is made of 5A05 antirust aluminum.
(5) Length of the embedded aluminum tube:
According to the data, the coefficient of static friction of the aluminum alloy and the aluminum alloy is 1.05-1.35, and the coefficient of static friction of the aluminum alloy and the low-carbon steel is 0.61. For 19 stranded aluminum-clad steel strands of the round wire concentric stranded overhead conductor and 19 stranded galvanized steel strands of the round wire concentric stranded overhead conductor, the static friction force of the 19 stranded galvanized steel strands of the round wire concentric stranded overhead conductor and the aluminum alloy embedded layer pipe is calculated, and the critical compression joint length l of the embedded layer aluminum pipe thread damageqminIs composed of
in the formula (19)
Fb-calculating the breaking force of the wire (or ground);
R-steel core strand thread pitch diameter d2half of (1);
d2The pitch diameter of the steel core strand thread.
Calculated, embedded layer aluminumcritical crimp length l for pipe thread damageqminIs smaller than the pitch of the steel core strand, and the pitch of the steel core strand is generally lOf qmin3 to 4 times, so for safety reasons the length of the inlay aluminum tube takes 2 steel core strand pitches (1 steel core strand pitch is 18 times the steel core diameter).
Calculating a steel pipe: the steel pipe material: the steel core is continuously crimped with the steel pipe by using a material Q345B, and the yield strength is 345 MPa.
Inner diameter of steel pipe: the inner diameter of a continuous steel pipe of the steel core stranded wire is equal to the outer diameter of the embedded layer aluminum pipe.
steel pipe external diameter: the total breaking force of 19 stranded steel strands of the circular concentric stranded overhead conductor is FbThe yield strength of the steel pipe is sigmasfeThen the thickness delta of the steel pipefeIs composed of
In the formula (20)
Fb-calculating the breaking force of the wire (or ground);
σsfe-steel pipe yield strength;
Dal-the external diameter of the intercalated aluminium tube.
The outer diameter of the steel pipe is
Dfe＝Dal+2δfe (21)
Length of steel pipe: the length of the steel pipe is the same as that of the embedded layer aluminum pipe, and the steel pipe is 2 steel core stranded wire pitches (1 steel core stranded wire pitch is 18 times of the diameter of the steel core).
Calculating the parameters of the mould: cross-sectional area of crimping die
1. cross-sectional area of crimping die
Steel core crimping cross-sectional area sx
in the formula (22)
r-steel core strand wire radius.
Section s of embedded aluminum tubeqIs composed of
In the formula (23)
Dal-the external diameter of the intercalated aluminium tube;
r-steel core strand wire radius.
Cross-sectional area s of steel pipegIs composed of
In the formula (24)
Dfe-the outside diameter of the steel pipe;
Dal-the external diameter of the intercalated aluminium tube.
Crimping die crimping cross-sectional area syIs composed of
sy＝sx+sq+sg (25)
2. The side length alpha of the regular hexagon pressing die is
3. The diagonal b of the regular hexagonal pressing die is
b＝a+2acos60°＝2a (27)
calculating the safe operation temperature: assuming that the environmental temperature is t when the splicing sleeve is installed0The linear expansion coefficient of the steel core and the steel pipe is afethe coefficient of expansion of the embedded aluminum pipeline is aalWhen the operating temperature is t1time of flight
1. Radial expansion of steel core
ΔRt＝Rafe(t1-t0) (28)
2. expansion amount of embedded aluminum pipe
Δdalt＝dalaal(t1-t0) (29)
3. expansion of inner diameter of steel pipe
Δrfet＝rfeafe(t1-t0) (30)
4. Safety temperature
When the temperature rises:
Namely, the increase of the running temperature of the splicing sleeve is met
In the formula (32)
σ1After the steel core splicing sleeve is formed by compression, the pressure of the press is relieved,
Compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
Sigma-before the pressure of a press is released after the steel core splicing sleeve is pressed and formed,
Compressive stress of the steel core, the embedded aluminum pipe and the steel pipe;
rfe-the internal radius of the steel tube after crimping;
R-steel core strand thread pitch diameter d2half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
Eal-young's modulus of the aluminium alloy;
afe-coefficient of linear expansion of steel;
aal-coefficient of linear expansion of aluminium;
when the temperature is reduced:
namely the reduction of the operation temperature of the splicing sleeve is satisfied
In the formula (34)
Fb-calculating the breaking force of the wire;
σ1After the copper core splicing sleeve is formed by crimping, the pressure of the press is released,
Compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe;
After the sigma-copper core splicing sleeve is formed by compression joint, before the pressure of a press is released,
Compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe;
rfe-the internal radius of the steel tube after crimping;
r-steel core strand thread pitch diameter d2Half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
Eal-young's modulus of the aluminium alloy;
r-radius of steel wire of steel core strand;
afe-coefficient of linear expansion of steel;
aalthe linear expansion coefficient of aluminum.
Example calculation
1. Steel cored aluminum strand parameters
2. Calculation of parameters of embedded aluminum tube
3. steel pipe parameter calculation
4. compression mold parameter calculation
5. safe operating temperature calculation
The above description is only an example of the specific embodiments of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art can easily find out the modifications or alterations within the technical scope of the present disclosure, which should be covered by the protection scope of the present disclosure. For this reason, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. a method for butting and embedding aluminum in 19 stranded steel strands of an overhead conductor is characterized by comprising the following steps of: the method comprises a steel strand butt-joint aluminum-embedded compression joint structure, the structure comprises a steel pipe (1) and an aluminum alloy pipe (2), the aluminum alloy pipe (2) is embedded into the steel pipe (1) and wraps two butt-joint round wire concentric stranded overhead conductors (19 stranded steel strands) (3), the compression joint steel pipe (1) enables the aluminum alloy pipe (2) to be tightly attached to the round wire concentric stranded overhead conductors (19 stranded steel strands) (3) to form a steel core splicing pipe, and the compression joint method comprises the following steps:
1) Embedding an aluminum alloy pipe into the steel pipe;
2) inserting the 19 stranded steel strands of the two butted circular wire concentric stranded overhead conductors from two ends of an aluminum alloy pipe, and ensuring that the insertion depths of the 19 stranded steel strands of the two circular wire concentric stranded overhead conductors are equal;
3) Adopting a crimping die to crimp the steel pipe, so that the aluminum alloy pipe is tightly attached to the surfaces of the 19 stranded steel strands of the round wire concentric stranded overhead conductor and gaps among the 19 stranded steel strands of the steel pipe and the round wire concentric stranded overhead conductor are filled to form a steel core splicing sleeve;
Thickness and length of aluminum tube:
(1) Aluminum material amount s between 19 stranded steel stranded wires of steel core splicing sleeve embedded into round wire concentric stranded overhead conductor after being compression-molded
In the formula (15)
r-radius of steel wire of steel core strand;
(2) thickness of aluminium tube required for embedding
in formula (16)
r-radius of steel wire of steel core strand;
the thickness of the embedded aluminum pipe is deltaal
δal＝δq+1(mm) (17)
(3) outer diameter D of embedded aluminum pipealIs composed of
Dal＝10r+1+2δal(mm) (18)
In the formula (18)
r-radius of steel wire of steel core strand;
The length of the aluminum alloy pipe (2) is two steel core strand pitches.
2. the butt-joint aluminum-embedded crimping method for 19 stranded steel strands of overhead conductors according to claim 1, characterized in that: the compression joint stress after the compression joint of the compression joint die for the steel pipe is as follows: when the press is not stopped after the steel core splicing sleeve is pressed and formed, the inner radius of the steel pipe is rfeThe center thickness of the steel pipe is dfeThe pitch diameter of the steel core strand thread is d2the thickness of the middle diameter of the aluminum pipe is dal；
according to the relation between the true stress sigma and the true strain epsilon of the material
σ＝Eε (8)
In the formula (8), E < - > is the Young modulus of the material;
after the press machine is stopped and moved away after the steel core splicing sleeve is subjected to compression joint forming, assuming that the compressive stress of the aluminum pipe wall is sigma1inner radius of steel pipefe+ΔrfeThe center thickness of the steel pipe is dfe+Δdfethe radius of the pitch diameter circle of the steel core stranded wire thread is R + delta R, and the pitch diameter thickness of the aluminum pipe is dal+Δdal
after the pressure of the press machine is relieved after the steel core splicing sleeve is formed by compression joint, each thickness increment relation is
Δrfe-ΔR＝Δdal (12)
After the pressure of the press machine is relieved after the steel core splicing sleeve is pressed and formed, the compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe is
in formula (14):
σ1after the steel core splicing tube is formed by compression joint, the pressure of a press is relieved, and the compression stress of the steel core, the embedded layer aluminum tube and the steel tube is relieved;
Sigma-compressive stress of the steel core, the embedded aluminum pipe and the steel pipe before pressure of the press machine is relieved after the steel core splicing pipe is formed by compression;
rfe-the internal radius of the steel tube after crimping;
R-steel core strand thread pitch diameter d2half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
EalYoung's modulus of aluminum alloys.
3. the method of claim 1the aluminum-embedded compression joint method for 19 stranded steel strands of overhead conductor is characterized by comprising the following steps: thickness delta of steel pipefeIs composed of
In the formula (20)
Fb-calculating the breaking force of the wire (or ground);
σsfe-steel pipe yield strength;
Dal-the external diameter of the intercalated aluminium tube;
the outer diameter of the steel pipe is
Dfe＝Dal+2δfe (21)。
4. The butt-joint aluminum-embedded crimping method for 19 stranded steel strands of overhead conductors according to claim 1, characterized in that: the crimping die is as follows:
cross sectional area of crimping
steel core crimping cross-sectional area sx
In the formula (22)
r-radius of steel wire of steel core strand;
section s of embedded aluminum tubeqIs composed of
In the formula (23)
Dal-the external diameter of the intercalated aluminium tube;
r-radius of steel wire of steel core strand;
Cross-sectional area s of steel pipegis composed of
In the formula (24)
Dfe-the outside diameter of the steel pipe;
Dal-the external diameter of the intercalated aluminium tube;
Crimping die crimping cross-sectional area syIs composed of
sy＝sx+sq+sg (25)
The side length alpha of the regular hexagon pressing die is
The diagonal b of the regular hexagonal pressing die is
b＝a+2acos60°＝2a (27)
5. The butt-joint aluminum-embedded crimping method for 19 stranded steel strands of overhead conductors according to claim 3, characterized in that: the safe working temperature range after the steel core splicing sleeve is formed by compression joint is as follows:
Assuming that the environmental temperature is t when the splicing sleeve is installed0The linear expansion coefficient of the steel core and the steel pipe is afethe coefficient of expansion of the embedded aluminum pipeline is aalwhen the operating temperature is t1time of flight
radial expansion of steel core
ΔRt＝Rafe(t1-t0) (28)
Expansion amount of embedded aluminum pipe
Δdalt＝dalaal(t1-t0) (29)
Expansion of inner diameter of steel pipe
Δrfet＝rfeafe(t1-t0) (30)
Safety temperature
when the temperature rises:
Namely, the increase of the running temperature of the splicing sleeve is met
In the formula (32)
σ1After the steel core splicing tube is formed by compression joint, the pressure of a press is relieved, and the compression stress of the steel core, the embedded layer aluminum tube and the steel tube is relieved;
sigma-compressive stress of the steel core, the embedded aluminum pipe and the steel pipe before pressure of the press machine is relieved after the steel core splicing pipe is formed by compression;
rfe-the internal radius of the steel tube after crimping;
R-steel core strand thread pitch diameter d2Half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
Eal-young's modulus of the aluminium alloy;
afe-coefficient of linear expansion of steel;
aal-coefficient of linear expansion of aluminium;
When the temperature is reduced:
Namely the reduction of the operation temperature of the splicing sleeve is satisfied
In the formula (34)
Fb-calculating the breaking force of the wire;
σ1after the pressure of a press machine is relieved after the copper core splicing sleeve is formed by compression joint, the compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe is relieved;
After the sigma < - > copper core splicing sleeve is formed by compression joint, before the pressure of a press is relieved, the compressive stress among the steel core, the embedded layer aluminum pipe and the steel pipe is relieved;
rfe-the internal radius of the steel tube after crimping;
r-steel core strand thread pitch diameter d2half of (1);
dal-equivalent thickness of the intercalated aluminum tube;
Efe-young's modulus of steel;
Eal-young's modulus of the aluminium alloy;
r-radius of steel wire of steel core strand;
afe-coefficient of linear expansion of steel;
aalThe linear expansion coefficient of aluminum.
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| CN110364831A (en) * | 2019-08-08 | 2019-10-22 | 贵州电网有限责任公司 | A kind of embedding aluminium crimping structure of the full tension of steel-cored aluminium strand |
| CN110444983B (en) * | 2019-08-08 | 2020-12-25 | 贵州电网有限责任公司 | Compression joint method for 19-strand steel-reinforced aluminum stranded wires of circular-wire concentric stranded overhead conductor |
| CN110445061B (en) * | 2019-08-08 | 2021-03-02 | 贵州电网有限责任公司 | Crimping method for aluminum-embedded strain clamp of 19 stranded steel-cored aluminum strands |
| CN110364907B (en) * | 2019-08-08 | 2021-01-26 | 贵州电网有限责任公司 | Compression joint method for 7-strand steel-cored aluminum strands of round-wire concentric stranded overhead conductor |
| CN110380308A (en) * | 2019-08-09 | 2019-10-25 | 贵州电网有限责任公司 | A kind of 19 embedding aluminium strain clamp compression bonding methods of strand steel strand wires |
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