CN108179259B - Steel core prestress treatment system and prestress treatment method for steel core aluminum stranded wire - Google Patents

Abstract

The invention provides a steel core prestress treatment system and a prestress treatment method for a steel core aluminum stranded wire, wherein a wire inlet tension device, a heating device and a wire outlet tension device are sequentially arranged between a wire pay-off rack and a wire take-up rack; the wire inlet tension device comprises a wire inlet tension wheel and a wire inlet wheel driving piece for driving the wire inlet tension wheel to rotate; the wire outlet tension device comprises a wire outlet tension wheel and a wire outlet wheel driving piece for driving the wire outlet tension wheel to rotate; the rotation speed of the incoming wire tension wheel is smaller than that of the outgoing wire tension wheel; the steel core of the steel-cored aluminum stranded wire which is paid out from the wire pay-off rack is wound on the wire-in tension wheel, and after passing through the heating device, the steel core is wound on the wire-out tension wheel. The invention can solve the problem that the deformation and creep generated by the traditional steel-cored aluminum strand under the action of temperature and stress change the stress characteristics of the steel-cored aluminum strand, thereby affecting the operation safety of the steel-cored aluminum strand.

Description

Steel core prestressing system and prestressing method for steel core aluminum stranded wire

Technical field

The invention relates to the technical field of overhead transmission lines, and in particular to a steel core prestressing system and prestressing method for steel core aluminum stranded wires.

Background technique

Steel core aluminum stranded wire is one of the most commonly used conductors in overhead transmission lines, accounting for more than 80% of the entire conductor type. As a composite structural component, its inner steel strand core is mainly responsible for bearing force, while the outer aluminum wire is mainly used as a conductor to transmit electrical energy. During operation, the performance of the conductor depends on the steel core, aluminum wire and the structural matching characteristics of the two. The steel core made by traditional methods is twisted with the outer aluminum wire to form a steel core aluminum stranded wire. Its performance is the combination of steel core and aluminum wire. For steel-core aluminum stranded wires, the steel core mainly serves as a load-bearing member and plays a load-bearing function, while the aluminum wire mainly plays a conductive function. Therefore, the mechanical properties of the steel core largely determine the mechanical properties of the steel core aluminum stranded wire.

In practical applications, due to the temperature changes of the ACSR and the external loads such as wind, ice and snow, the ACSR will deform to a certain extent, causing the sag of the ACSR to increase. This in turn brings great safety risks to line operation. How to improve the mechanical properties of the steel core in steel-core aluminum stranded wires is a problem that needs to be solved by those skilled in the art.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a steel core prestressing treatment system and a prestressing treatment method for steel core aluminum stranded wires.

In order to solve the above technical problems, the present invention provides a steel core prestressing treatment system for steel core aluminum stranded wires, including: a conductor pay-out frame and a conductor take-up frame. The conductor pay-out frame pays out the steel core aluminum stranded wire. The conductor pay-off frame receives the steel core of the steel-core aluminum stranded wire; an incoming wire tension device, a heating device and an outgoing wire tension device are arranged in sequence between the conductor pay-off frame and the conductor take-up frame. ; The incoming line tension device includes an incoming line tension wheel and an incoming line wheel driving member that drives the incoming line tension wheel to rotate; the outgoing line tension device includes an outgoing line tension wheel and an outgoing line wheel driving member that drives the outgoing line tension wheel to rotate ; The rotation speed of the incoming wire tension wheel is less than the rotation speed of the outgoing wire tension wheel; the steel core of the steel core aluminum stranded wire released from the wire pay-off frame is wound on the incoming wire tension wheel, After passing through the heating device, it is wound around the outlet tension wheel.

Preferably, the heating device is a medium frequency induction heating furnace.

Preferably, the steel core prestressing treatment system of the steel core aluminum stranded wire further includes: an air blowing and cleaning device; the air blowing and cleaning device is arranged between the outlet wire tension device and the wire take-up frame, and Above the steel core of the steel-core aluminum stranded wire.

The invention also relates to a steel core prestressing treatment method for steel core aluminum stranded wires. The steel core prestressing treatment system for steel core aluminum stranded wires includes the following steps: After the core is released from the wire pay-off frame, the steel core is wound around the incoming wire tension wheel of the incoming wire tension device and the outgoing wire tension wheel of the outgoing wire tension device. The incoming wire tension device and the outgoing wire tension device are The steel core applies tension, and the rotation speed of the incoming wire tension wheel is less than the rotation speed of the outlet wire tension wheel. The tension applied to the steel core output from the outlet wire tension device is the maximum breaking of the steel core. 30%-60% of the force; after the steel core is output from the incoming wire tension device and before the steel core is input into the outgoing wire tension device, the heating device heats the steel core, and the heating temperature is 360 ° C - 400 ° C; the wire take-up frame performs a wire take-up operation on the steel core output from the outlet tension device.

Preferably, the steel core prestressing treatment method processes the steel core at a speed of 3-5m/min.

Further, the speed at which the outgoing wire tension device processes the steel core is 3-5m/min.

Further, the speed at which the heating device processes the steel core is 3-5m/min.

Preferably, the steel core prestressing treatment system further includes: an air blowing cleaning device; the air blowing cleaning device is provided between the outlet wire tension device and the wire take-up frame, and is located between the steel core aluminum strand above the steel core of the wire; the air blowing and cleaning device blows air on the steel core output by the incoming wire tension device.

Further, the air blowing cleaning device blows high-pressure gas on the surface of the steel core, and the pressure of the blown high-pressure gas is 5Mpa-7Mpa.

Furthermore, the speed at which the air blowing cleaning device processes the steel core is 3-5m/min.

As mentioned above, the steel core prestressing system and prestressing method of the steel core aluminum stranded wire of the present invention have the following beneficial effects:

The incoming wire tension device and the outgoing wire tension device of the present invention form a tension applying component that applies prestress to the steel core; the steel core is prestressed so that the steel core obtains a certain compressive stress. After stranding the external aluminum wire, it can Change the mechanical properties of the steel core aluminum stranded wire during construction and operation; through the steel core prestressing treatment, the initial elongation of the steel core during subsequent construction is eliminated, and through cooperation with the aluminum wire, the overall steel core aluminum stranded wire is reduced Initial elongation, and can change the stress distribution of the steel core aluminum stranded wire, causing the migration point temperature of the steel core aluminum stranded wire to drop; eliminating the creep of the steel core, thereby reducing the service life of the entire steel core aluminum stranded wire The periodic creep amount solves the problem of increased sag after operation; a heating device is installed between the incoming wire tension device and the outgoing wire tension device to heat the steel core during the prestressing process of the steel core, which can improve the steel core. The stress distribution of the steel core works together with the stress obtained by the steel core to accelerate the strain deformation of the steel core and achieve the effect of prestressing the steel core; the invention can solve the deformation of the traditional steel core aluminum stranded wire under the action of temperature and stress. And creep changes the stress characteristics of steel core aluminum stranded wires, which in turn affects the operation safety of steel core aluminum stranded wires.

Description of the drawings

Figure 1 shows a schematic structural diagram of the steel core prestressing system of the steel core aluminum stranded wire in this embodiment.

Figure 2 shows a schematic diagram of the stress-strain relationship of the untreated steel core, carbon fiber composite core and prestressed steel core in this embodiment.

Explanation of reference numbers

10 steel core

100 wire pay-off stand

200 wire take-up stand

300 incoming line tension device

310 Inlet tension wheel

400 heating device

500 outlet tension device

510 outlet tension wheel

600 air blow cleaning device

Detailed ways

The implementation of the present invention is described below with specific embodiments. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

Please see attached picture. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to coordinate with the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the implementation of the present invention. Restrictive conditions, so they have no technical substantive significance. Any structural modifications, changes in proportions, or adjustments in size should still fall within the scope of the present invention as long as they do not affect the effects that the present invention can produce and the purposes that can be achieved. Within the scope of the technical content disclosed. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for convenience of description and are not used to limit the scope of this specification. The scope of the invention that can be implemented, and changes or adjustments in their relative relationships, as long as there is no substantial change in the technical content, shall also be regarded as the scope of the invention that can be implemented.

The prestressed processing system for the steel core 10 of the steel core aluminum stranded wire in this embodiment includes: a conductor pay-out frame 100 and a conductor take-up frame 200. The conductor pay-out frame 100 pays out the steel core 10 of the steel core aluminum stranded wire. The wire frame 100 receives the steel core 10 of the steel core aluminum stranded wire;

An incoming wire tension device 300, a heating device 400 and an outgoing wire tension device 500 are arranged in sequence between the wire pay-off frame 100 and the wire take-up frame 200;

The incoming line tension device 300 includes an incoming line tension wheel 310 and an incoming line wheel driving part that drives the incoming line tension wheel 310 to rotate;

The outlet tension device 500 includes an outlet tension wheel 510 and an outlet wheel driving part that drives the outlet tension wheel 510 to rotate;

The rotation speed of the incoming wire tension wheel 310 is smaller than the rotation speed of the outgoing wire tension wheel 510; the steel core 10 of the steel core aluminum stranded wire released from the wire pay-off frame 100 is wound on the incoming wire tension wheel 310, and then passes through the heating device 400 Finally, it is wound on the outlet tension wheel 510.

In the present invention, the rotation speed of the inlet tension wheel 310 is smaller than the rotation speed of the outlet tension wheel 510, so when the rotation speed of the outlet tension wheel 510 drives the output of the steel core 10, prestress is applied to the steel core 10; the inlet tension device 300 and the outlet tension device 500 form a tension application component that applies prestress to the steel core 10; the steel core 10 is prestressed so that the steel core 10 obtains a certain compressive stress. After stranding the external aluminum wire, the steel core 10 can be changed. The mechanical properties of the core 10 aluminum stranded wire during construction and operation; through the prestressing treatment of the steel core 10, the initial elongation of the steel core 10 during subsequent construction is eliminated, and through cooperation with the aluminum wire, the entire steel core 10 aluminum stranded wire is reduced The initial elongation of the wire, and can change the stress distribution of the steel core 10 aluminum stranded wires, causing the migration point temperature of the steel core 10 aluminum stranded wires to drop; eliminate the creep amount of the steel core 10, thereby reducing the entire steel core 10 The creep amount of the aluminum stranded wire during the service life cycle solves the problem of increased sag after operation; a heating device 400 is provided between the incoming wire tension device 300 and the outgoing wire tension device 500 to pre-stress the steel core 10 Heating can improve the stress distribution of the steel core 10 and act together with the stress obtained by the steel core 10 to accelerate the strain deformation of the steel core 10 to achieve the effect of prestressing the steel core 10 .

Using the system of this embodiment to prestress the steel core 10 is to eliminate the initial elongation that will occur during the construction of the steel core 10 in advance during the production process. Steel core 10 aluminum stranded wire is composed of steel core 10 and aluminum wire, which reduces the initial elongation of steel core 10 and thereby reduces the initial elongation of steel core 10 aluminum stranded wire. The steel core 10 treated by prestressing has low creep. Compared with the untreated steel core 10, a positive pressure is generated before the aluminum wire is stranded. Then, after the aluminum wire is stranded, the entire steel core 10 is stranded. When the wire is stressed, it acts as a reaction force to the tensile stress, reducing the effect of the tensile stress. In this way, the external aluminum wire is quickly acted upon by force and undergoes plastic deformation, and the tensile force of the aluminum stranded wires of the steel core 10 is transferred to the steel core 10. In this way, the migration point temperature of the steel core 10 aluminum stranded wire is lower than that of the untreated steel core 10 aluminum stranded wire.

In this embodiment, the driving part of the incoming line wheel is an incoming line control motor, and the driving part of the outgoing line wheel is an outgoing line control motor.

The rotation speed of the outlet tension wheel 510 is 0.1m/min-0.5m/min faster than the rotation speed of the inlet tension wheel 310. When the rotation speed of the outlet tension wheel 510 drives the output of the steel core 10, prestress is applied to the steel core 10.

The heating device 400 is a medium frequency induction heating furnace. The medium frequency induction heating furnace can heat the steel core 10 stably and evenly. Since the medium frequency induction heating furnace is non-contact heating, it can ensure that it will not affect the prestressing process of the steel core 10 .

The steel core 10 prestressing treatment system of the steel core aluminum stranded wire also includes: an air blowing cleaning device 600; the air blowing cleaning device 600 is arranged between the outlet tension device 500 and the conductor take-up frame 200, and is located between the steel core aluminum stranded wire above the steel core 10. The air blowing cleaning device 600 can blow off impurities on the steel core 10 before the steel core 10 enters the wire take-up frame 200, thereby achieving a cleaning effect on the surface of the steel core 10.

This embodiment also relates to a method for prestressing the steel core 10 of the steel core aluminum stranded wire. The steel core 10 prestressing processing system of the steel core aluminum stranded wire is used, which includes the following steps: After the core 10 is released from the wire pay-off frame 100, the steel core 10 is wound around the incoming wire tension wheel 310 of the incoming wire tension device 300 and the outlet wire tension wheel 510 of the outlet wire tension device 500. The incoming wire tension device 300 and the outlet wire tension device 500 applies tension to the steel core 10, and the rotation speed of the incoming wire tension wheel 310 is less than the rotation speed of the outlet tension wheel 510. The tension applied to the steel core 10 output from the outlet tension device 500 is 30% of the maximum breaking force of the steel core 10. %-60%; after the steel core 10 is output from the incoming wire tension device 300 and before the steel core 10 is input into the outgoing wire tension device 500, the heating device 400 heats the steel core 10, and the heating temperature is 360°C-400°C; the wire is retracted The wire rack 200 performs a wire take-up operation on the steel core 10 output from the outlet wire tension device 500 .

The tension applied to the steel core 10 output from the outlet tension device 500 is 30%-60% of the maximum breaking force of the steel core 10, which can ensure the strength of the steel core 10 while ensuring the prestressing effect of the steel core 10. The temperature at which the heating device 400 heats the steel core 10 can ensure the required prestressing treatment effect of the steel core 10 .

The steel core 10 prestressing treatment method processes the steel core 10 at a speed of 3-5m/min. The speed at which the outlet tension device 500 processes the steel core 10 is 3-5m/min. The heating device 400 processes the steel core 10 at a speed of 3-5 m/min. The speed of processing the steel core 10 not only ensures the prestressing treatment effect of the steel core 10, but also has high processing efficiency.

The steel core 10 prestressing treatment system also includes: an air blowing cleaning device 600; the air blowing cleaning device 600 is arranged between the outlet tension device 500 and the wire take-up frame 200, and is above the steel core 10 of the steel core aluminum stranded wire; The air blowing cleaning device 600 blows air onto the steel core 10 output from the incoming line tension device 300 to achieve a cleaning effect on the surface of the steel core 10 .

The air blowing cleaning device 600 blows high-pressure gas on the surface of the steel core 10, and the pressure of the blown high-pressure gas is 5Mpa-7Mpa. Blowing high-pressure gas can quickly and efficiently clean the surface of the steel core 10 .

The speed at which the air blow cleaning device 600 processes the steel core 10 is 3-5m/min.

As shown in Figure 2, in the stress-strain line S1 of the untreated steel core 10, the stress-strain relationship of the untreated steel core 10 is linear in the initial stage. After reaching a certain amount of deformation, the stress increases slowly and the strain increases rapidly. Large, this shows that the untreated steel core 10 has undergone plastic deformation at this time. In the stress-strain line S2 of the carbon fiber composite core, for the carbon fiber composite core, the stress-strain relationship is linear during the entire stress stage. Therefore, carbon fiber composite core conductors have excellent sag performance characteristics. For the prestressed steel core 10 of this embodiment, it can be seen from Figure 2 that in the stress-strain line S3 of the prestressed steel core 10, in its stress stage, the stress-strain also presents a linear relationship, so as As a reinforcing core wire, it also has excellent sag performance characteristics.

The invention can solve the problem of the deformation and creep of traditional steel core 10 aluminum stranded wires changing the force characteristics of the steel core 10 aluminum stranded wires under the action of temperature and stress, thereby affecting the operation safety of the steel core 10 aluminum stranded wires. .

In summary, this embodiment effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above embodiments only illustrate the principles and effects of this embodiment, but are not used to limit this embodiment. Anyone familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the embodiments. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in this embodiment shall still be covered by the claims of this embodiment.

Claims (10)

1. A steel core pre-stress treatment system for a steel core aluminum strand, comprising: the wire pay-off rack (100) and the wire take-up rack (200), wherein the wire pay-off rack (100) pays out a steel core (10) of the steel-cored aluminum strand, and the wire pay-off rack (100) receives the steel core (10) of the steel-cored aluminum strand; the wire pay-off rack is characterized in that a wire inlet tension device (300), a heating device (400) and a wire outlet tension device (500) are sequentially arranged between the wire pay-off rack (100) and the wire take-up rack (200);

the wire inlet tension device (300) comprises a wire inlet tension wheel (310) and a wire inlet wheel driving piece for driving the wire inlet tension wheel (310) to rotate;

the wire outlet tension device (500) comprises a wire outlet tension wheel (510) and a wire outlet wheel driving piece for driving the wire outlet tension wheel (510) to rotate;

the rotational speed of the incoming line tension wheel (310) is less than the rotational speed of the outgoing line tension wheel (510);

the steel core (10) of the steel-cored aluminum strand paid out from the wire pay-off rack (100) is wound on the wire-in tension wheel (310), penetrates into the heating device (400) and is wound on the wire-out tension wheel (510);

the tension applied to the steel core (10) output by the wire outlet tension device (500) is 30% -60% of the maximum breaking force of the steel core (10); after the steel core (10) is output from the wire inlet tension device (300) and before the steel core (10) is input into the wire outlet tension device (500), the steel core (10) is heated by the heating device (400), and the heating temperature is 360-400 ℃.

2. The steel core prestress treatment system of a steel-cored aluminum strand according to claim 1, wherein: the heating device (400) is an intermediate frequency induction heating furnace.

3. The steel core prestress treatment system of a steel-cored aluminum strand according to claim 1, wherein: further comprises: a blow cleaning device (600); the blowing cleaning device (600) is arranged between the wire outlet tension device (500) and the wire collecting frame (200) and is positioned above the steel core (10) of the steel-cored aluminum strand.

4. A steel core prestress treatment method of a steel core aluminum stranded wire, which adopts a steel core (10) prestress treatment system of the steel core aluminum stranded wire according to any one of claims 1-2, and is characterized in that: the method comprises the following steps:

after a steel core (10) of a steel-cored aluminum strand is paid out from a wire pay-off rack (100), the steel core (10) is sequentially wound on a wire-in tension wheel (310) of a wire-in tension device (300) and a wire-out tension wheel (510) of a wire-out tension device (500), the wire-in tension device (300) and the wire-out tension device (500) apply tension to the steel core (10), the rotation speed of the wire-in tension wheel (310) is smaller than that of the wire-out tension wheel (510), and the tension applied to the steel core (10) output from the wire-out tension device (500) is 30% -60% of the maximum breaking force of the steel core (10); after the steel core (10) is output from the wire inlet tension device (300) and before the steel core (10) is input into the wire outlet tension device (500), the steel core (10) is heated by a heating device (400), and the heating temperature is 360-400 ℃; the wire take-up frame (200) performs a take-up operation on the steel core (10) output from the wire-out tension device (500).

5. The steel core prestress treatment method of the steel-cored aluminum strand according to claim 4, wherein: the speed of the steel core (10) treated by the steel core (10) prestress treatment method is 3-5m/min.

6. The steel core prestress treatment method of the steel-cored aluminum strand according to claim 5, wherein the steel core prestress treatment method comprises the following steps: the speed of the wire outlet tension device (500) for treating the steel core (10) is 3-5m/min.

7. The steel core prestress treatment method of the steel-cored aluminum strand according to claim 5, wherein the steel core prestress treatment method comprises the following steps: the speed of the heating device (400) for treating the steel core (10) is 3-5m/min.

8. The steel core prestress treatment method of the steel-cored aluminum strand according to claim 4, wherein: the steel core (10) pre-stress treatment system further comprises: a blow cleaning device (600); the blowing cleaning device (600) is arranged between the wire outlet tension device (500) and the wire collecting frame (200) and is positioned above the steel core (10) of the steel-cored aluminum strand; the blowing cleaning device (600) blows the steel core (10) output by the wire inlet tension device (300).

9. The steel core prestress treatment method of the steel-cored aluminum strand of claim 8, wherein: the blowing cleaning device (600) blows high-pressure gas to the surface of the steel core (10), and the pressure of the blown high-pressure gas is 5Mpa-7Mpa.

10. The steel core prestress treatment method of the steel-cored aluminum strand of claim 8, wherein: the speed of the blowing cleaning device (600) for treating the steel core (10) is 3-5m/min.