High-strength and high-conductivity aluminum alloy non-pressing connecting fitting

Abstract

The application discloses a high-strength and high-conductivity aluminum alloy non-pressure contact connecting fitting and belongs to the technical field of wire connecting fittings. The high-strength and high-conductivity aluminum alloy non-pressure contact connecting fitting comprises two wedge cores, two wedge shells, a connector, a spring and a plurality of screws. The spring is arranged between the two wedge cores, and the two wedge shells are connected through the connector. Each wedge core comprises two butt-jointed wedge-shaped core bodies, each wedge shell comprises two butt-jointed wedge-shaped shell bodies, arc-shaped grooves matched with wires are arranged on the wedge-shaped core bodies, the two wedge-shaped core bodies are clamped on the upper and lower sides of the wires respectively and are fixed through the plurality of screws, wedge-shaped grooves matched with the side surfaces of the two wedge-shaped core bodies are arranged on the wedge-shaped shell bodies, the two wedge-shaped shell bodies are clamped on the left and right sides of the two wedge-shaped core bodies and are fixed through the plurality of screws. The high-strength and high-conductivity aluminum alloy non-pressure contact connecting fitting is convenient to construct, reliable in connection and has the characteristics of high strength and high conductivity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire joint fittings, and particularly relates to a high-strength and high-conductivity aluminum alloy non-pressure joint fitting. BACKGROUND

[0002] The continuous growth of power demand and the uneven distribution of energy drive the rapid development of long-distance and cross-regional power transmission. As a prerequisite for long-distance and cross-regional power transmission, the construction of a strong and intelligent power transmission network is of great significance. Overhead transmission lines are the "skeleton" and "vein" of the strong and intelligent power transmission network. Due to the length limitation of the conductor / ground wire, the connection between conductors is realized by joint fittings in the construction of overhead transmission lines to complete uninterrupted power transmission, which is inevitable.

[0003] At present, the joint fittings widely used mainly include three types of pressure joint fittings, pre-stranded joint fittings and clamp joint fittings, among which the pressure joint fittings are most widely used. The joint fittings need to bear the full tension of the conductor / ground wire and also play a current-carrying role as a conductor. Although the above-mentioned three types of fittings are manufactured and constructed under high standards and strict requirements, problems affecting the safety of the line still occur in their service.(1) Faults of pressure joint fittings: the pressure joint fitting occurs in the pressure joint fitting process, which causes the local overload due to the deviation of the pressure joint position, resulting in wire drop, water ingress due to poor sealing of the joint fitting, wire slip due to insufficient holding force, wire damage caused by pressure joint construction, etc.;(2) Faults of pre-stranded joint fittings: the pre-stranded joint fitting has uniform holding force distribution and no stress concentration point, so it has a significant effect on improving the fatigue performance of the conductor joint. However, if not handled properly, the pre-stranded joint fitting may heat up, which affects the safety of the line. At the same time, gaps exist between the pre-stranded joint fitting pitch and between the single wires, which are prone to crevice corrosion and other problems in harsh environments, causing wire breakage;(3) Faults of clamp joint fittings: due to the small contact area of the clamp joint fitting, stress concentration occurs at the clamp position, which causes damage to the aluminum stranded wire, and there is a risk of heating during long-term operation. In severe cases, the joint may even overheat and melt. In addition, when the line is disconnected due to a fault, the above-mentioned three types of joint methods cannot achieve quick and flexible construction, and even cannot realize jointing due to the limitation of the construction conditions on site. Therefore, it is necessary to develop a non-pressure joint fitting that can be quickly and conveniently constructed to meet the needs of different application scenarios.

[0004] In addition, the connection fitting for aluminum conductor needs to meet the requirements of conductivity and load bearing, that is, it needs to have high conductivity and high strength. Due to the contradictory relationship between strength and conductivity, the strength of the aluminum alloy material used for the conductor and the fitting can only reach about 300 MPa when the room temperature conductivity of aluminum is greater than or equal to 55% IACS, which cannot meet the strength requirements for service in harsh conditions. Therefore, the development of high-strength high-conductivity aluminum alloy material with sufficient strength is of great significance for the diversification of service scenarios, service safety and energy saving of the connection fitting. SUMMARY

[0005] Therefore, the present application provides a high-strength high-conductivity aluminum alloy non-pressure connection fitting which is convenient to construct, reliable in connection, high in strength and high in conductivity.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0007] A high-strength high-conductivity aluminum alloy non-pressure connection fitting, comprising two wedge cores, two wedge shells, a connector, a spring and a plurality of screws; the spring is arranged between the two wedge cores, and the two wedge shells are connected through the connector; each wedge core comprises two butt-jointed wedge-shaped cores, and each wedge shell comprises two butt-jointed wedge-shaped shells; the wedge-shaped core is provided with an arc-shaped groove matched with the conductor; the two wedge-shaped cores are respectively clamped on the upper and lower sides of the conductor and fixed by the plurality of screws; the wedge-shaped shell is provided with a wedge-shaped groove matched with the side surface of the wedge-shaped core; the two wedge-shaped shells are respectively clamped on the two sides of the wedge-shaped core in the parallel direction of the conductor and fixed by the plurality of screws.

[0008] Further, the arc-shaped groove is provided with a knurled pattern for increasing the gripping force with the conductor.

[0009] Further, there is a taper of 1:20 between the outer wall of the wedge core and the inner wall of the wedge shell.

[0010] Further, the inner side of the wedge core is provided with a groove matched with the spring.

[0011] Further, the connector and the two wedge shells are connected through positive and reverse threads respectively, and the threads between the connector and the wedge shell are prevented from loosening by using a locking screw.

[0012] Further, the materials of the wedge core, the wedge shell and the connector are high-strength high-conductivity aluminum alloy.

[0013] Further, the high-strength high-conductivity aluminum alloy contains the following chemical components by weight percentage: Mg 0.6-0.7%, Si 0.35-0.45%, Fe 0.2-0.25%, B 0.01-0.05%, Re 0.08-0.1%, and the balance being Al.

[0014] Further, the preparation method of the high-strength and high-conductivity aluminum alloy comprises the following steps:

[0015] S1, in a melting furnace, aluminum boron intermediate alloy is added to the aluminum melt to remove Ti, V, Mn and Cr trace transition element impurities;

[0016] S2, Mg, Si, Fe and Re prepared according to the above mass percentage are added to the aluminum melt, the smelting temperature is 750 DEG C, the smelting time is 3 hours, and a mixed melt I is obtained;

[0017] S3, the mass percentage of each chemical component in the mixed melt is detected, the component content with mass percentage deviation is adjusted, the content range of each component is ensured within the corresponding mass percentage range, and a mixed melt II is obtained;

[0018] S4, the mixed melt II is degassed and double-stage filtered, and then cast into an aluminum alloy cast bar;

[0019] S5, the aluminum alloy cast bar is subjected to solid solution, artificial aging and cold rolling to obtain an aluminum alloy profile.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] The high-strength and high-conductivity aluminum alloy non-pressure joint fitting of the present application fixes the steel core aluminum strand in the two wedge cores, then fixes the wedge core in the wedge shell, locks the aluminum strand in the form of wedge core and wedge shell, connects the two wedge shells through the connector to realize the connection between the two aluminum strands; the contact part between the wedge core and the wire is in the form of knurling to increase the holding force of the wire; after the wire is installed, the end of the wedge core is fixed by screws to prevent the wire from slipping under stress; due to the taper of 1:20 between the outer wall of the wedge core and the inner wall of the wedge shell, when the steel core aluminum strand bears load, the steel core aluminum strand drives the wedge-shaped core to move outward, and the wedge-shaped core moves to the center to clamp the steel core aluminum strand, thereby realizing reliable fixation of the aluminum strand; the connector is connected with the two wedge shells through the male and female threads, and the spring is placed in the connector in a movable state, which can pre-tighten the wedge core during installation, and the situation that one end cannot reach the pre-tightening effect due to the asynchronous installation of the connector and the two wedge shells will not occur.

[0022] In addition, the wedge core, the wedge shell and the connector of the high-strength and high-conductivity aluminum alloy non-pressure contact connecting fitting are made of high-strength and high-conductivity aluminum alloy. The aluminum alloy is boronized by adding aluminum-boron intermediate alloy to the aluminum and the aluminum alloy, so that the content of Fe element can be reduced in addition to removing the impurities of Ti, V, Mn and Cr transition elements in the aluminum matrix, but there is no obvious effect on the element Si. The rare earth element rhenium is added, on the one hand, the Fe and Si elements in the aluminum can react with the Fe and Si elements, so that the Fe and Si elements are converted from the solid solution state to the precipitation state, thereby improving the conductivity of the aluminum, on the other hand, the atomic radius of rhenium is larger than that of aluminum, and the property is relatively active, and the surface defects of the alloy phase can be easily filled in the aluminum liquid, thereby improving the mechanical properties, corrosion resistance and heat resistance of the aluminum alloy. In addition, the addition of 0.08-0.1% of the rare earth element rhenium can make the Si in the aluminum alloy precipitate in the form of Si-rich clusters, improve the conductivity of the aluminum alloy, and at the same time, the content of silicon can be controlled, so that the weight ratio of magnesium and silicon in the aluminum alloy is less than 1.73, the solid solubility of Mg2Si in the aluminum is maintained, and the strengthening effect of Mg2Si in the alloy is ensured, thereby improving the strength of the aluminum alloy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a sectional view of the embodiment 1 of the present application;

[0024] Fig. 2 is a structural schematic view of the wedge core and the wedge shell in the embodiment 1 of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0026] Embodiment 1

[0027] As Figs. 1-2As shown, a high-strength, high-conductivity aluminum alloy non-pressure connection fitting includes two wedge cores 2, two wedge shells 1, a connector 4, a spring 5, and multiple screws 6; the spring 5 is arranged between the two wedge cores 2, and the two wedge shells 1 are connected by the connector 4; each wedge core 2 includes two abutting wedge-shaped cores 21, each wedge shell 1 includes two abutting wedge-shaped shells 11, the wedge-shaped core 21 is provided with an arc-shaped groove 22 matched with the wire, the two wedge-shaped cores 21 are respectively clamped on the upper and lower sides of the wire and fixed by multiple screws 6, and the wedge-shaped shell 11 is provided with a wedge-shaped groove 12 matched with the side surface of the two wedge-shaped cores, the two wedge-shaped shells 11 are clamped on the left and right sides of the two wedge-shaped cores 21 and the wire and fixed by multiple screws 6.

[0028] The arc-shaped groove 22 is provided with knurling patterns to increase the gripping force with the wire. After the wire is installed, the end of the wedge core 2 is fixed by the screw 6 to prevent the wire from slipping under stress.

[0029] According to experiments, the smaller the wedge angle, the greater the maximum friction force that the wedge core 2 can provide to the wire. A taper ratio of 1:20 and a wedge angle of 2.864° are selected. Because there is a taper of 1:20 between the outer wall of the wedge core 2 and the inner wall of the wedge shell 1, when the aluminum strand bears a load, the aluminum strand drives the wedge core 2 to move in the direction of the aluminum strand and in the direction of the wedge angle of the wedge shell, and the wedge core 2 simultaneously moves towards the axis of the aluminum strand to clamp the aluminum strand, thereby achieving the fixation of the aluminum strand.

[0030] The inner side of the wedge core 2 is provided with a groove matched with the spring 5, the spring 5 is clamped in the grooves of the two wedge cores, the spring 5 is placed in the connector 4 and is in a movable state, and the spring 5 can pre-tighten the wedge core 2 during installation, and the situation that one end cannot achieve pre-tightening effect due to different installation steps of the connector 4 and the two wedge shells 1 will not occur.

[0031] The connector 4 and the two wedge shells 1 are connected by positive and reverse threads, respectively, the inner threads at the two ends of the connector 4 are opposite in direction, the outer surface of the two wedge shells 1 is provided with a cylindrical connection structure (not shown in the figure), the cylindrical connection structure is provided with external threads, and the threads between the connector 4 and the wedge shell 1 are prevented from loosening by the use of a locking screw 3.

[0032] The high-strength and high-conductivity aluminum alloy non-pressure contact connecting fitting of the embodiment of the present application is installed with the spring in the middle of the connector, both wires are first clamped on the upper and lower wedge-shaped cores and fixed by screws, and then the two wedge-shaped shells are clamped on the wedge-shaped cores from the left and right sides and fixed by screws; the two wires with the installed wedge-shaped cores and wedge-shaped shells are inserted into the connector, at this time, the wedge-shaped cores and the wires can move to the side of the spring, the wire end enters the spring, the both ends of the spring are located in the grooves of the two wedge-shaped cores respectively, and pre-tightening is performed, and then the connector is axially rotated, the two wedge-shaped shells move towards each other under the action of the forward and reverse threads, so that the wedge-shaped cores and the wires are locked, and the two wires are connected and fastened.

[0033] Embodiment 2

[0034] The high-strength and high-conductivity aluminum alloy non-pressure contact connecting fitting of the embodiment of the present application is different from that of embodiment 1 in that the materials of the wedge-shaped core, the wedge-shaped shell and the connector are high-strength and high-conductivity aluminum alloys.

[0035] The high-strength and high-conductivity aluminum alloy contains the following chemical components by weight percentage: Mg 0.6%, Si 0.35%, Fe 0.2%, B 0.01%, Re 0.08%, and the balance is Al.

[0036] The preparation method of the high-strength and high-conductivity aluminum alloy comprises the following steps:

[0037] S1, in the melting furnace, aluminum boron intermediate alloy is added to the aluminum melt to remove Ti, V, Mn, Cr trace transition group element impurities;

[0038] S2, Mg, Si, Fe and Re prepared according to the above mass percentage are added to the aluminum melt, the melting temperature is 750 DEG C, and the melting time is 3 hours, to obtain a mixed melt one;

[0039] S3, the mass percentage of each chemical component in the mixed melt one is detected, the component content with mass percentage deviation is adjusted, the content range of each component is ensured within the corresponding mass percentage range, and a mixed melt two is obtained;

[0040] S4, after degassing and double-stage filtration of the mixed melt two, the aluminum alloy cast bar is cast;

[0041] S5, the aluminum alloy cast bar is subjected to solid solution, artificial aging, cold rolling, aging, and an aluminum alloy profile is obtained.

[0042] The trace transition group element impurities such as Ti, V, Mn, Cr and the like dissolved in the aluminum matrix can easily absorb free electrons in the aluminum to fill the electron shells which are not yet filled, so that the number of conduction electrons is reduced, thereby reducing the electrical conductivity of the material. Therefore, in the embodiment of the present application, boron element is used to react with the transition group element impurities to form insoluble borides (such as VB2, TiB2, etc.), which are settled at the bottom of the furnace and removed in the form of slag, thereby improving the electrical conductivity of the aluminum.

[0043] Example 3

[0044] The embodiment of the present application is different from example 2 in that:

[0045] The high-strength and high-conductivity aluminum alloy contains the following chemical components by weight percentage: Mg 0.65%, Si 0.40%, Fe 0.23%, B 0.03%, Re 0.09%, and the balance of Al.

[0046] The preparation method of the high-strength and high-conductivity aluminum alloy is substantially the same as that of example 2, and will not be repeated here.

[0047] Example 4

[0048] The embodiment of the present application is different from examples 2 and 3 in that:

[0049] The high-strength and high-conductivity aluminum alloy contains the following chemical components by weight percentage: Mg 0.7%, Si 0.45%, Fe 0.25%, B 0.05%, Re 0.1%, and the balance of Al.

[0050] The preparation method of the high-strength and high-conductivity aluminum alloy is substantially the same as that of example 2, and will not be repeated here.

[0051] In the embodiment of the present application, when no rare earth is added to the alloy, the Si element mainly exists in the alloy in a solid solution state. When 0.1% of the rare earth rhenium is added to the alloy, Si-rich clusters exist in the structure, that is, the addition of the rare earth is beneficial to the precipitation of Si in the alloy. Si element is an impurity element in the aluminum matrix, and the maximum solubility of Si element in aluminum is 1.65 wt.%, therefore, when the Mg content is fixed, the Si element is precipitated by 0.1% of the rare earth rhenium, so as to reduce the content of Si element in the aluminum alloy, and at the same time, it is also convenient for the reaction of silicon and magnesium to produce Mg2Si strengthening phase.

[0052] Comparative Example 1

[0053] The aluminum alloy contains the following chemical components by weight percentage: Mg 0.7%, Si 0.35%, Fe 0.2%, Re 0.08%, and the balance of Al, as well as trace elements Ti, V, Mn, Cr.

[0054] The preparation method of the aluminum alloy comprises the following steps:

[0055] (1) Mg, Si, Fe, Re prepared according to the above mass percentage were added into the aluminum melt, the smelting temperature was 750℃, the smelting time was 3 hours, to obtain mixed melt one;

[0056] (2) The mass percentage of each chemical component in the mixed melt was detected, the content of the component with deviation in mass percentage was adjusted, to ensure the content range of each component within the corresponding mass percentage range, to obtain mixed melt two;

[0057] (3) After degassing and double-stage filtration of the mixed melt two, it was cast into aluminum alloy cast bar;

[0058] (4) The aluminum alloy cast bar was subjected to solid solution, artificial aging and cold rolling, to obtain aluminum alloy profile.

[0059] Comparative Example 2

[0060] The aluminum alloy contains the following chemical components by weight percentage: Mg 0.7%, Si 0.4%, Fe 0.25%, B 3.35%, and the balance of Al.

[0061] The preparation method of the aluminum alloy comprises the following steps:

[0062] (1) In the smelting furnace, aluminum boron master alloy was added into the aluminum melt to remove trace transition group element impurities of Ti, V, Mn and Cr;

[0063] (2) Mg, Si and Fe prepared according to the above mass percentage were added into the aluminum melt, the smelting temperature was 700℃, the smelting time was 2 hours, to obtain mixed melt one;

[0064] (3) The mass percentage of each chemical component in the mixed melt was detected, the content of the component with deviation in mass percentage was adjusted, to ensure the content range of each component within the corresponding mass percentage range, to obtain mixed melt two;

[0065] (4) After degassing and double-stage filtration of the mixed melt two, it was cast into aluminum alloy cast bar;

[0066] (5) The aluminum alloy cast bar was subjected to solid solution, artificial aging and cold rolling, to obtain aluminum alloy profile.

[0067] Test analysis

[0068] (I) The tensile strength, elongation and electrical conductivity of the aluminum alloy materials prepared in Examples 2-4 and Comparative Examples 1-2 were detected, and the results are shown in the following table.

[0069] Table 1 Properties of each aluminum alloy

[0070]

[0071] (1) According to the test results of Examples 2-4, the tensile strength of the high-strength high-conductivity aluminum alloy is about 370 MPa, and the conductivity is about 60% IACS, which meets the requirements of the aluminum strand non-pressure connection fitting; (2) In Comparative Example 1, no boron treatment was performed, and the conductivity decreased. Moreover, because the magnesium-silicon ratio was greater than 1.73, the solid solubility of the strengthening phase Mg2Si in the aluminum decreased, thereby reducing the strength of the aluminum alloy; (3) In Comparative Example 2, no rare earth metal rhenium was used, resulting in a decrease in conductivity.

[0072] (2) The non-pressure connection fittings made of the aluminum alloy materials of Examples 2-4 and 6063 aluminum alloy were subjected to temperature rise, resistance, and grip strength tests. The tests were performed in accordance with the standards GB / T 2317.1-2008 "Power Fittings Test Methods Part 1 - Mechanical Tests" and GB / T 2317.3-2008 "Power Fittings Test Methods Part 3: Thermal Cycle Test".

[0073] (1) The temperature rise and resistance measurement results are shown in the following table:

[0074] Table 2.1 shows the measurement results of resistance before temperature rise. As can be seen from the test results, at different current values, the resistance of the same length of wire is greater than that of the connection tube, and the resistance of the aluminum alloy non-pressure connection fitting is about 63.8% of the same length of wire, meeting the requirement in DL / T 758-2009 that the non-pressure connection fitting should not be greater than 1.1 times the resistance of the same length of wire.

[0075] Table 2.1 Resistance measurement results before temperature rise

[0076]

[0077] A current of 840 A was applied to the test circuit, and the temperature rise of the wire and the fitting in the circuit was measured. After the temperature rise test, the resistance was measured, and the measurement results were basically the same as before the temperature rise. The resistance of the connection tube was about 65% of that of the wire, meeting the requirements of DL / T 758-2009 for connection fittings. The measurement results are shown in Table 2.2.

[0078] Table 2.2 Resistance measurement results after temperature rise

[0079]

[0080] (2) Grip strength test

[0081] The grip strength of the connection fitting was measured using a horizontal experimental tension machine YWL-100 in accordance with the standard GB / T 2317.1-2008 "Power Fittings Test Methods Part 1 - Mechanical Tests". The wire was fixed at both ends of the tension testing machine using a wedge-shaped wire clamp. The measurement results are shown in Table 2.3.

[0082] Table 2.3 grip measurement results

[0083]

[0084] From the above table, it can be seen that the tension is added to 95% of the calculated tensile force and the wire does not slip and break during the process of keeping 60 seconds, which shows that the grip of the aluminum alloy non-pressing connection fitting meets the requirement of DL / T 758-2009 "Connection fitting" that the grip value of the connection fitting should reach 95% of the calculated tensile force of the connected wire.

[0085] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A high-strength, high-conductivity aluminum alloy non-crimped bonding fitting, characterized by: The utility model relates to a high-strength and high-conductivity aluminum alloy non-pressure contact connecting fitting, which comprises two wedge cores, two wedge shells, a connector, a spring and a plurality of screws. The spring is arranged between the two wedge cores, and the two wedge shells are connected through the connector. Each wedge core comprises two wedge-shaped cores that are connected in a butt joint manner, and each wedge shell comprises two wedge-shaped shells that are connected in a butt joint manner. The wedge-shaped cores are provided with arc-shaped grooves that are matched with the wires. The wedge-shaped shells are provided with wedge-shaped grooves that are matched with the side surfaces of the wedge-shaped cores. The inner side of the wedge core is provided with a groove that is matched with the spring. The connector is connected with the two wedge shells through positive and reverse threads, respectively. The inner threads of the two ends of the connector are opposite in direction. The outer surfaces of the two wedge shells are provided with cylindrical connecting structures.

2. The high-strength, high-conductivity aluminum alloy non-crimp joining hardware of claim 1, wherein: The threads between the connector and the wedge shells are prevented from loosening by using a locking screw.

3. The high-strength, high-conductivity aluminum alloy non-crimp connector fitting of claim 1, wherein: The spring is arranged in the middle of the connector. The two wires are first clamped and screwed through the upper and lower wedge-shaped cores, and then clamped and screwed through the left and right wedge-shaped shells. The two wires with the installed wedge cores and wedge shells are inserted into the connector. At this time, the wedge cores and the wires can move towards the spring side. The ends of the wires enter the spring. The ends of the spring are located in the grooves of the two wedge cores, respectively. The connector is axially rotated. The two wedge shells move towards each other under the action of the positive and reverse threads, thereby locking the wedge cores and the wires. The two wires are connected and fastened. The materials of the wedge core, the wedge shell and the connector are high-strength and high-conductivity aluminum alloy. The high-strength and high-conductivity aluminum alloy contains the following chemical components by mass percentage: Mg 0.6-0.7%, Si 0.35-0.45%, Fe 0.2-0.25%, B 0.01-0.05%, Re 0.08-0.1%, and the balance being Al. The preparation method of the high-strength and high-conductivity aluminum alloy comprises the following steps: S1, in a melting furnace, aluminum boron intermediate alloy is added to the aluminum melt to remove trace transition element impurities such as Ti, V, Mn and Cr. S2, Mg, Si, Fe and Re prepared according to the above mass percentage are added to the aluminum melt, the melting temperature is 750°C, and the melting time is 3 hours to obtain a mixed melt one. S3, the mass percentage of each chemical component in the mixed melt is detected, and the component content with deviation in mass percentage is adjusted to ensure that the content of each component is within the corresponding mass percentage range to obtain a mixed melt two. S4, the mixed melt two is degassed and double-filtered, and then cast into an aluminum alloy cast bar. S5, the aluminum alloy cast bar is subjected to solid solution, artificial aging and cold rolling to obtain an aluminum alloy profile. The arc-shaped groove is provided with a knurled pattern to increase the gripping force with the wire. The outer wall of the wedge core and the inner wall of the wedge shell have a taper of 1:20.

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