Tension fitting for stranded carbon fiber composite core wire and installation method thereof

Abstract

The invention provides a strain fitting for a stranded carbon fiber composite core wire and an installation method of the strain fitting. The strain fitting comprises a self-fastening sleeve; the self-fastening sleeve comprises a sleeve body, and a fastening supporting block is arranged in the sleeve body. The outer crimping pipe is connected with the self-fastening sleeve, and the lining pipe is inserted into the outer crimping pipe; the top pressing piece is connected with the storage groove; a middle conical through hole and a plurality of peripheral inclined through holes are formed in the front side face of the fastening supporting block body. Each group of wedge-shaped clamps comprises two wedge-shaped clamping blocks; the carbon fiber composite core wire is inserted into the lining pipe, a composite core at the rear part of the carbon fiber composite core wire is divided into a plurality of single-strand wires, one of the single-strand wires is inserted into the middle conical through hole, and the other single-strand wires are respectively inserted into the corresponding peripheral inclined through holes; and the two wedge-shaped clamping blocks are used for clamping the single-strand wire. The strain fitting provided by the invention is convenient to install and can reduce the radial pressure intensity of the twisted carbon fiber composite core wire.

Description

Technical Field

[0001] The invention relates to the technical field of cable installation, in particular to a tension fitting for a stranded carbon fiber composite core conductor and an installation method thereof. Background Art

[0002] The carbon fiber composite core conductor replaces the steel core in the existing steel core aluminum stranded wire with a carbon fiber composite core. The carbon fiber composite core conductor has the advantages of low specific gravity, large current carrying capacity, low loss, and low sag, and has been increasingly applied and promoted in recent years. Among them, the multi-strand twisted carbon fiber composite core conductor is one of the two mainstream types of composite cores, and has better bending resistance than the rod-type carbon fiber composite core. The existing tension fittings still wrap the entire stranded carbon fiber composite core conductor. However, the cross-section of the stranded carbon fiber composite core conductor is not a perfect circle and cannot fit perfectly with the clamp. During the clamping process, a stress concentration effect will occur, which will lead to the generation of cracks, reducing the reliability and service life of the composite core.

[0003] How to design a tension fitting that is easy to install and can reduce the radial pressure on the twisted carbon fiber composite core conductor is a problem that technicians in this field need to solve. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem solved by the present invention is to provide a tension fitting for a stranded carbon fiber composite core conductor, which is easy to install and can reduce the radial pressure on the stranded carbon fiber composite core conductor and an installation method thereof.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a tension fitting for a stranded carbon fiber composite core conductor, comprising: an outer compression tube, a self-tightening sleeve, an inner liner tube, multiple sets of wedge-shaped clamps and a top pressure piece;

[0006] The self-tightening sleeve comprises a sleeve body, the interior of the sleeve body is provided with a fastening support block, and the rear end of the fastening support block and the inner wall of the sleeve body form a receiving groove;

[0007] The rear end of the external compression tube is connected to the front end of the self-tightening sleeve, and the inner liner is inserted into the external compression tube; the top pressure piece is inserted into the receiving groove, and the top pressure piece is connected to the receiving groove;

[0008] An intermediate conical through hole is provided on the front side surface of the fastening support block, and the central axis of the intermediate conical through hole is coaxially arranged with the central axis of the self-fastening sleeve; a plurality of peripheral inclined through holes are also provided on the front side surface of the fastening support block, all of which are arranged outside the intermediate conical through hole, and are evenly arranged around the circumference of the intermediate conical through hole, and the central axis of each of the peripheral inclined through holes is inclined relative to the central axis of the intermediate conical through hole; the intersection of the central axes of all the peripheral inclined through holes is on the central axis of the intermediate conical through hole; the angle between the central axis of each peripheral inclined through hole and the central axis of the intermediate conical through hole is in the range of 2-3°.

[0009] Each group of the wedge-shaped clamps comprises two wedge-shaped clamping blocks; the middle tapered through hole is for inserting a group of the wedge-shaped clamps; each of the peripheral inclined through holes is for inserting a group of the wedge-shaped clamps; the cone angle of the middle tapered through hole is equal to the cone angle of the peripheral inclined through hole; the two wedge-shaped clamping blocks of the wedge-shaped clamps have the same shape; when the two wedge-shaped clamping blocks are arranged opposite to each other, the cone angle formed by the outer side surface of the wedge-shaped clamp is equal to the cone angle of the middle tapered through hole; each of the wedge-shaped clamping blocks has an arc-shaped concave groove, and the radius of the concave groove is equal to the radius of the single strand;

[0010] The front part of the carbon fiber composite core conductor is inserted into the inner lining tube, and the composite core at the rear part of the carbon fiber composite core conductor is divided into a plurality of single strands, one of which is inserted into the middle conical through hole, and the remaining single strands are respectively inserted into the corresponding peripheral inclined through holes; the concave grooves of the two wedge-shaped clamping blocks of the wedge-shaped clamp in the middle conical through hole clamp the single strand; the concave grooves of the two wedge-shaped clamping blocks of the wedge-shaped clamp in the peripheral inclined through hole clamp the single strand; and the top pressure piece applies pressure to the wedge-shaped clamp.

[0011] Preferably, after the aluminum strands at the rear of the carbon fiber composite core conductor are cut off, the rear end of the aluminum strands of the carbon fiber composite core conductor and the rear end of the inner lining tube are in the same plane, and there is a gap between the rear end of the inner lining tube and the front end of the self-tightening sleeve.

[0012] Preferably, a rubber pad is sleeved on the front end of the pressing member, and the rubber pad is in contact with the wedge-shaped clamp.

[0013] Furthermore, the thickness of the rubber pad is 3-6 mm.

[0014] Preferably, the front end of the middle tapered through hole and the front ends of all the peripheral inclined through holes have rounded corners; the rear end of the middle tapered through hole and the rear ends of all the peripheral inclined through holes have rounded corners.

[0015] Preferably, the cone angle of the middle tapered through hole is equal to the cone angle of the peripheral inclined through hole;

[0016] The two wedge-shaped clamping blocks of the wedge-shaped clamp have the same shape; when the two wedge-shaped clamping blocks are arranged opposite to each other, the included angle formed by the wedge-shaped clamp is equal to the cone angle of the middle cone through hole;

[0017] Each of the wedge-shaped clamping blocks has an arc-shaped recessed groove, and the radius of the recessed groove is equal to the radius of the single-strand wire.

[0018] Preferably, the concave groove of each wedge-shaped clamping block is provided with convex lines.

[0019] The present invention also relates to a method for installing a tension fitting for a stranded carbon fiber composite core conductor, comprising the following steps:

[0020] Step 1), cutting off the aluminum stranded wire at the end of the carbon fiber composite core conductor;

[0021] Step 2), inserting the carbon fiber composite core conductor into the inner lining tube, aligning and crimping the rear end of the inner lining tube with the rear end of the aluminum strand of the carbon fiber composite core conductor;

[0022] Step 3), inserting the inner lining tube into the outer compression tube, separating all the single strands of the carbon fiber composite core conductor, inserting one of the single strands into the middle conical through hole, and inserting the remaining single strands into the peripheral inclined through holes; connecting the outer compression tube with the self-tightening sleeve;

[0023] Step 4), inserting a wedge-shaped clamp into each of the peripheral inclined through holes, and inserting a wedge-shaped clamp into the middle tapered through hole, so that the two wedge-shaped clamping blocks of the wedge-shaped clamp clamp the corresponding single strand wire; adjusting all the single strand wires in the carbon fiber composite core conductor so that all the wedge-shaped clamps are tightened;

[0024] Step 5), the pressing piece is connected to the external pressure pipe until the rubber pad provided on the front end of the pressing piece generates pressure on the wedge-shaped clamp.

[0025] Preferably, in the step 1), after the aluminum stranded wire at the end of the carbon fiber composite core conductor is cut off, the exposed length of the composite core at the end of the carbon fiber composite core conductor is 250-300 mm.

[0026] Preferably, in step 3), the interval between the rear end of the liner pipe and the front end of the self-tightening sleeve is 10 to 15 mm.

[0027] Preferably, in step 4), the inner wall of the wedge-shaped clamp fits with the outer side surface of the single strand of the composite core; the outer wall of the wedge-shaped clamp in the middle conical through hole fits with the inner wall of the middle conical through hole; the outer wall of the wedge-shaped clamp in the peripheral inclined through hole fits with the inner wall of the peripheral inclined through hole.

[0028] As described above, the tension fittings for stranded carbon fiber composite core conductors and the installation method thereof of the present invention have the following beneficial effects: when the two wedge-shaped clamps are arranged relative to each other, the cone angle formed by the conical outer side surface of the wedge-shaped clamp is equal to the cone angle of the intermediate conical through hole, and the wedge-shaped clamp has an arc-shaped concave groove inside, and the radius of the concave groove is equal to the radius of the single strand, then the two wedge-shaped clamps of the wedge-shaped clamp in the intermediate conical through hole clamp the single strand, and when the two wedge-shaped clamps of the wedge-shaped clamp in the peripheral inclined through hole clamp the single strand, the wedge-shaped clamp can be completely fitted with each single strand of the composite core, and the intermediate conical through hole is The single strand wire 13 inserted into the shaped through hole 221 and the single strand wire 13 in the peripheral inclined through hole 222 are both fixed by two wedge-shaped clamping blocks 410. Compared with the method in the prior art that the hardware crimps the composite core rod as a whole, the tension hardware of the present invention clamps and fixes the bifurcated single strand wire 13 separately, which can reduce the radial pressure on the carbon fiber composite core conductor, and also can reduce the damage to the composite core 12 caused by stress concentration; the installation method of the present invention is easy to use, the construction difficulty is not high, and the operability is strong; the present invention is a tension hardware that is easy to install and can reduce the radial pressure on the twisted carbon fiber composite core conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the outer structure of the carbon fiber composite core conductor when the carbon fiber composite core conductor is inserted into the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0030] Figure 2 Display as Figure 1 Schematic diagram of the structure of the AA section.

[0031] Figure 3 Display as Figure 1 Schematic diagram of the structure of the BB section.

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the self-tightening sleeve of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0033] Figure 5 It is a schematic side view of the structure of the self-tightening sleeve of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0034] Figure 6It is a schematic diagram of the front side structure of the self-tightening sleeve of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0035] Figure 7 It is a schematic diagram showing the rear side structure of the self-tightening sleeve of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the wedge-shaped clamp block of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0037] Fig. 9 It is a schematic diagram showing the internal structure of the self-tightening sleeve of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0038] Fig.10 It is a schematic diagram of the three-dimensional structure of the external connection pressure tube of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0039] Fig.11 It is a schematic diagram of the three-dimensional structure of the top pressing piece of the tension fitting for the stranded carbon fiber composite core conductor of this embodiment.

[0040] Description of Figure Numbers

[0041] 10 Carbon fiber composite core conductor

[0042] 11 Aluminum stranded wire

[0043] 12 Composite core

[0044] 13 Single strand

[0045] 100 External pressure pipe

[0046] 110 Pipe body inner thread

[0047] 200 Self-tightening sleeve

[0048] 210 sleeve body

[0049] 220 Fastening support block

[0050] 221 Middle tapered through hole

[0051] 222 Peripheral inclined through hole

[0052] 223 block external thread

[0053] 230 Storage Slot

[0054] 231 Groove internal thread

[0055] 240 Fillet

[0056] 300 Lined Pipe

[0057] 400 Wedge Grips

[0058] 410 Wedge Clamp

[0059] 411 Depression

[0060] 500 Pressed parts

[0061] 510 Pressed external thread

[0062] 600 Rubber pad

[0063] 700 Deflector DETAILED DESCRIPTION

[0064] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0065] Please refer to the attached drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the attached drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0066] like Figures 1 to 11 As shown, the tension fitting for stranded carbon fiber composite core conductor of this embodiment includes: an outer compression tube 100, a self-tightening sleeve 200, an inner liner tube 300, a plurality of sets of wedge-shaped clamps 400 and a top pressure piece 500;

[0067] The self-tightening sleeve 200 includes a sleeve body 210, and a fastening support block 220 is provided inside the sleeve body 210. The rear end of the fastening support block 220 and the inner wall of the sleeve body 210 form a receiving groove 230.

[0068] The rear end of the external compression tube 100 is connected to the front end of the self-tightening sleeve 200, and the inner liner 300 is inserted into the external compression tube 100; the top pressure piece 500 is inserted into the receiving groove 230, and the top pressure piece 500 is connected to the receiving groove 230;

[0069] An intermediate conical through hole 221 is provided on the front side of the fastening support block 220, and the central axis of the intermediate conical through hole 221 is coaxially arranged with the central axis of the self-fastening sleeve 200, and the central axis of the self-fastening sleeve 200 is perpendicular to the front side of the self-fastening sleeve 200; a plurality of peripheral inclined through holes 222 are also provided on the front side of the fastening support block 220, and all the peripheral inclined through holes 222 are arranged outside the intermediate conical through hole 221, and all the peripheral inclined through holes 222 are evenly arranged around the circumference of the intermediate conical through hole 221, and the central axis of each peripheral inclined through hole 222 is inclined relative to the central axis of the intermediate conical through hole 221; the intersection of the central axes of all the peripheral inclined through holes 222 is on the central axis of the intermediate conical through hole 221; the value range of the angle C between the central axis of each peripheral inclined through hole 222 and the central axis of the intermediate conical through hole 221 is 2-3°;

[0070] Each set of wedge clamps 400 includes two wedge clamps 410; the middle tapered through hole 221 is for inserting a set of wedge clamps 400; each peripheral inclined through hole 222 is for inserting a set of wedge clamps 400; the cone angle of the middle tapered through hole 221 is equal to the cone angle of the peripheral inclined through hole 222; the two wedge clamps 410 of the wedge clamp 400 have the same shape; when the two wedge clamps 410 are arranged opposite to each other, the cone angle formed by the outer side surface of the wedge clamp 400 is equal to the cone angle of the middle tapered through hole 221; each wedge clamp 410 has an arc-shaped concave groove 411, and the radius of the concave groove 411 is equal to the radius of the single strand 13;

[0071] The front part of the carbon fiber composite core conductor 10 is inserted into the inner liner tube 300, and the composite core 12 at the rear part of the carbon fiber composite core conductor 10 is divided into a plurality of single strands 13, wherein one single strand 13 is inserted into the middle conical through hole 221, and the remaining single strands 13 are respectively inserted into the corresponding peripheral inclined through holes 222; the recessed grooves 411 of the two wedge-shaped clamping blocks 410 of the wedge-shaped clamp 400 in the middle conical through hole 221 clamp the single strand 13; the recessed grooves 411 of the two wedge-shaped clamping blocks 410 of the wedge-shaped clamp 400 in the peripheral inclined through hole 222 clamp the single strand 13; the top pressure piece 500 applies pressure to the wedge-shaped clamp 400.

[0072] The carbon fiber composite core conductor 10 includes an aluminum stranded wire 11 and a composite core 12 located inside the aluminum stranded wire 11 . The composite core 12 includes a plurality of single strands 13 .

[0073] Since the cone angle formed by the conical outer side surface of the wedge-shaped clamp 400 is equal to the cone angle of the middle conical through hole 221 when the two wedge-shaped clamps 410 are arranged relative to each other, the wedge-shaped clamp 410 has an arc-shaped recessed groove 411 inside, and the radius of the recessed groove 411 is equal to the radius of the single-stranded wire 13. When the two wedge-shaped clamps 410 of the wedge-shaped clamp 400 in the middle conical through hole 221 clamp the single-stranded wire 13, and the two wedge-shaped clamps 410 of the wedge-shaped clamp 400 in the outer peripheral inclined through hole 222 clamp the single-stranded wire 13, the inner wall of the wedge-shaped clamp 400 fits with the outer side surface of the single-stranded wire 13 of the composite core 12; the outer wall of the wedge-shaped clamp 400 in the middle conical through hole 221 is The wall is fitted with the inner wall of the middle conical through hole 221; the outer wall of the wedge-shaped fixture 400 in the outer peripheral inclined through hole 222 is fitted with the inner wall of the outer peripheral inclined through hole 222, and the single strand 13 inserted in the middle conical through hole 221 and the single strand 13 in the outer peripheral inclined through hole 222 are fixed by two wedge-shaped clamps 410. Compared with the method of crimping the composite core rod as a whole by the hardware in the prior art, the tension hardware of the present invention clamps and fixes the bifurcated single strand 13 separately, which can reduce the radial pressure on the carbon fiber composite core conductor, and also can reduce the damage to the composite core 12 caused by stress concentration; the installation method of the present invention is easy to use, the construction difficulty is not high, and the operability is strong. The installation method can reduce the radial pressure on the twisted carbon fiber composite core conductor to improve the reliability of the composite core 12 itself, so as to achieve the purpose of reducing damage and prolonging life. The present invention is a tension hardware that is easy to install and can reduce the radial pressure on the twisted carbon fiber composite core conductor.

[0074] The value range of the angle C between the central axis of each peripheral inclined through hole 222 and the central axis of the middle tapered through hole 221 is 2-3°. The value range of the angle C can reduce the bending angle of the composite core 12 and reduce the stress concentration effect of the composite core 12. In this embodiment, the angle between the central axis of the peripheral inclined through hole 222 and the central axis of the middle tapered through hole 221 is 2.6°.

[0075] Since the cross-section of the composite core 12 of the carbon fiber composite core conductor 10 is not a perfect circle, the overall crimping of the composite core 12 will cause stress concentration. The tension fitting of the present invention can ensure that the tension fitting is completely fitted to the composite core 12, thereby reducing the damage to the composite core 12 caused by stress concentration.

[0076] The contact area between the wedge-shaped clamp 400 of the present invention and the composite core 12 is also increased compared to the existing integrally crimped tension fittings. According to preliminary calculations, under the same gripping force, the pressure of the wedge-shaped clamp 400 of the present invention on the composite core 12 can be reduced by more than 60%.

[0077] Compared with the existing integral clamping hardware, the tension hardware of the present invention can still provide gripping force when the single-strand wires 13 of part of the composite core 12 are broken, thereby delaying the complete wire break accident and buying time for rescue.

[0078] In this embodiment, the front end of the fastening support block 220 is provided with a block external thread 223, and the rear end of the external compression tube 100 is provided with a tube internal thread 110, and the tube internal thread 110 is threadedly connected to the block external thread 223; the front end of the top pressure piece 500 is provided with a pressure piece external thread 510, and the groove wall of the receiving groove 230 is provided with a groove internal thread 231, and the pressure piece external thread 510 is threadedly connected to the groove internal thread 231. An inner liner tube 300 is provided between the external compression tube 100 and the aluminum stranded wire 11 as a connection, and the inner liner tube 300 is made of heat-resistant aluminum alloy material. The number of the peripheral inclined through holes 222 is six. The top pressure piece 500 is a steel anchor.

[0079] After the pressing member 500 is connected to the receiving groove 230 , the pressing member 500 will press the rear end of the protruding wedge-shaped clamp 400 to play a fixing role.

[0080] In order to facilitate the installation of the single strand wire 13 of the composite core 12 and the wedge-shaped clamp 400, the middle conical through hole 221 and the outer peripheral inclined through hole 222 are both through hole structures that shrink from back to front; when the two wedge-shaped clamps 410 are arranged opposite to each other, the wedge-shaped clamp 400 is a structure that shrinks from back to front.

[0081] After the aluminum strands 11 at the rear of the carbon fiber composite core conductor 10 are cut off, the rear end of the aluminum strands 11 of the carbon fiber composite core conductor 10 is in the same plane as the rear end of the inner liner 300, and there is a gap between the rear end of the inner liner 300 and the front end of the self-tightening sleeve 200. This structure allows the aluminum strands 11 that have not been stripped to be clamped by the inner liner 300.

[0082] The outer side surface of the rear part of the self-tightening sleeve 200 is connected to the guide plate 700. The self-tightening sleeve 200 and the guide plate 700 are welded into one body.

[0083] The angle between the central axis of each peripheral inclined through hole 222 and the central axis of the middle tapered through hole 221 is equal to the cone angle of the middle tapered through hole 221 . This structure is conducive to the wedge-shaped clamp 400 to stably clamp the single strand 13 of the composite core 12 .

[0084] The front end of the top pressing piece 500 is sleeved with a rubber pad 600, and the rubber pad 600 is in contact with the wedge clamp 400. The rubber pad 600 is a cover structure, and the rubber pad 600 covers the front end of the top pressing piece 500. The rubber pad 600 serves as a buffer between the top pressing piece 500 and the wedge clamp 400. The rubber pad 600 is made of wear-resistant material. Since the rear ends of the wedge clamps 400 in different peripheral inclined through holes 222 cannot be in the same plane, when the top pressing piece 500 is tightened in the groove body inner thread 231 in the receiving groove 230, the rubber pad 600 can fit the rear ends of all the wedge clamps 400, that is, the top pressing piece 500 applies pressure to the wedge clamps 400 through the rubber pad 600.

[0085] In order to make the rubber pad 600 achieve a better buffering effect between the top pressing piece 500 and the wedge-shaped clamp 400, the thickness of the rubber pad 600 is 3-6 mm. In this embodiment, the thickness of the rubber pad is 5 mm.

[0086] The front end of the middle tapered through hole 221 and the front ends of all the peripheral inclined through holes 222 have rounded corners 240; the rear end of the middle tapered through hole 221 and the rear ends of all the peripheral inclined through holes 222 have rounded corners 240. The rounded corners 240 can avoid stress concentration at the front end of the middle tapered through hole 221, the front end of the peripheral inclined through hole 222, the rear end of the middle tapered through hole 221, and the rear end of the peripheral inclined through hole 222; since the stress transition at the front end of the middle tapered through hole 221 and the front end of the peripheral inclined through hole 222 is relatively smooth, it is convenient for the single strand 13 to be inserted from the front end of the middle tapered through hole 221 and the front end of the peripheral inclined through hole 222.

[0087] The concave groove 411 of each wedge-shaped clamping block 410 is provided with convex lines, which make the surface of the concave groove 411 have rough lines to enhance the friction force.

[0088] The installation method of the tension fittings for the stranded carbon fiber composite core conductor of this embodiment comprises the following steps:

[0089] Step 1), cutting off the aluminum stranded wire 11 at the end of the carbon fiber composite core conductor 10;

[0090] Step 2), insert the carbon fiber composite core conductor 10 into the inner liner tube 300, align the rear end of the inner liner tube 300 with the rear end of the aluminum stranded wire 11 of the carbon fiber composite core conductor 10, and crimp;

[0091] Step 3), insert the inner liner tube 300 into the outer compression tube 100, separate all the single strands 13 of the carbon fiber composite core conductor 10, insert one single strand 13 into the middle conical through hole 221, and insert the remaining single strands 13 into the outer peripheral inclined through holes 222; connect the outer compression tube 100 to the self-tightening sleeve 200;

[0092] Step 4), insert a wedge-shaped clamp 400 into each peripheral inclined through hole 222, and insert a wedge-shaped clamp 400 into the middle tapered through hole 221, so that the two wedge-shaped clamping blocks 410 of the wedge-shaped clamp 400 clamp the corresponding single strand 13; adjust all the single strands 13 in the carbon fiber composite core conductor 10 so that all the wedge-shaped clamps 400 are tightened;

[0093] Step 5), the pressing piece 500 is connected to the external pressure pipe 100 until the rubber pad 600 provided on the front end of the pressing piece 500 generates pressure on the wedge-shaped clamp 400.

[0094] In step 1), after the aluminum strand 11 at the end of the carbon fiber composite core conductor 10 is cut off, the length of the composite core 12 at the end of the carbon fiber composite core conductor 10 is exposed to 250-300 mm. The length of the composite core 12 exposed enables the composite core 12 to be clamped by the wedge-shaped clamp 400 with a longer length. In this embodiment, the length of the composite core 12 at the end of the carbon fiber composite core conductor 10 is exposed to 280 mm.

[0095] In step 2), the rear end of the inner liner tube 300 and the rear end of the aluminum stranded wire 11 of the carbon fiber composite core conductor 10 are crimped using an existing crimping tool.

[0096] In step 3), in said step 3), the interval between the rear end of the inner liner tube 300 and the front end of the self-tightening sleeve 200 is 10 to 15 mm. The value range of this interval can reduce the angle formed between the multiple single strands 13 that are forked. In this embodiment, the interval between the rear end of the inner liner tube 300 and the front end of the self-tightening sleeve 200 is 12 mm.

[0097] In step 4), the inner wall of the wedge-shaped clamp 400 fits with the outer side surface of the single strand 13 of the composite core 12; the outer wall of the wedge-shaped clamp 400 in the middle conical through hole 221 fits with the inner wall of the middle conical through hole 221; the outer wall of the wedge-shaped clamp 400 in the peripheral inclined through hole 222 fits with the inner wall of the peripheral inclined through hole 222, so that the wedge-shaped clamp 400 can stably clamp the single strand 13.

[0098] In step 4), all the single strands 13 in the carbon fiber composite core conductor 10 are adjusted by shaking the single strands 13, and the rear ends of the single strands 13 are always in the corresponding middle conical through holes 221, so that the wedge-shaped clamp 400 holding the single strands 13 can be tightened.

[0099] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A tension fitting for a stranded carbon fiber composite core conductor, characterized in that: include: An external compression pipe (100), a self-tightening sleeve (200), an inner liner pipe (300), a plurality of sets of wedge-shaped clamps (400) and a pressing piece (500); The self-tightening sleeve (200) comprises a sleeve body (210), the interior of the sleeve body (210) is provided with a fastening support block (220), and the rear end of the fastening support block (220) and the inner wall of the sleeve body (210) form a receiving groove (230); The rear end of the external pressure-receiving tube (100) is connected to the front end of the self-tightening sleeve (200), and the inner liner tube (300) is inserted into the external pressure-receiving tube (100); the pressing piece (500) is inserted into the receiving groove (230), and the pressing piece (500) is connected to the receiving groove (230); The front side surface of the fastening support block (220) is provided with a middle conical through hole (221), and the central axis of the middle conical through hole (221) is coaxially arranged with the central axis of the self-fastening sleeve (200); the front side surface of the fastening support block (220) is also provided with a plurality of peripheral inclined through holes (222), and all of the peripheral inclined through holes (222) are arranged outside the middle conical through hole (221) and around the circumference of the middle conical through hole (221). All of the peripheral inclined through holes (222) are evenly arranged, and the central axis of each of the peripheral inclined through holes (222) is inclined relative to the central axis of the middle tapered through hole (221); the intersection of the central axes of all of the peripheral inclined through holes (222) is located on the central axis of the middle tapered through hole (221); the value range of the angle between the central axis of each of the peripheral inclined through holes (222) and the central axis of the middle tapered through hole (221) is 2-3°; Each group of the wedge-shaped clamps (400) comprises two wedge-shaped clamping blocks (410); the intermediate conical through hole (221) is for inserting a group of the wedge-shaped clamps (400); each of the peripheral inclined through holes (222) is for inserting a group of the wedge-shaped clamps (400); the cone angle of the intermediate conical through hole (221) is equal to the cone angle of the peripheral inclined through hole (222); the two wedge-shaped clamping blocks (410) of the wedge-shaped clamp (400) are of the same shape; when the two wedge-shaped clamping blocks (410) are arranged opposite to each other, the cone angle formed by the outer side surface of the wedge-shaped clamp (400) is equal to the cone angle of the intermediate conical through hole (221); each of the wedge-shaped clamping blocks (410) has an arc-shaped concave groove (411), and the radius of the concave groove (411) is equal to the radius of the single strand (13); The front part of the carbon fiber composite core conductor (10) is inserted into the inner lining tube (300), and the composite core (12) at the rear part of the carbon fiber composite core conductor (10) is divided into a plurality of single strands (13), one of the single strands (13) is inserted into the middle conical through hole (221), and the remaining single strands (13) are respectively inserted into the corresponding outer peripheral inclined through holes (222); the concave grooves (411) of the two wedge-shaped clamping blocks (410) of the wedge-shaped clamp (400) in the middle conical through hole (221) clamp the single strands (13); the concave grooves (411) of the two wedge-shaped clamping blocks (410) of the wedge-shaped clamp (400) in the outer peripheral inclined through hole (222) clamp the single strands (13); The pressing member (500) applies pressure to the wedge-shaped clamp (400).

2. The tension fitting for stranded carbon fiber composite core conductor according to claim 1, characterized in that: After the aluminum stranded wire (11) at the rear of the carbon fiber composite core conductor (10) is cut off, the rear end of the aluminum stranded wire (11) of the carbon fiber composite core conductor (10) and the rear end of the inner lining tube (300) are in the same plane, and there is a gap between the rear end of the inner lining tube (300) and the front end of the self-tightening sleeve (200).

3. The tension fitting for stranded carbon fiber composite core conductor according to claim 1, characterized in that: A rubber pad (600) is sleeved on the front end of the pressing member (500), and the rubber pad (600) is in contact with the wedge-shaped clamp (400).

4. The tension fitting for stranded carbon fiber composite core conductor according to claim 3, characterized in that: The thickness of the rubber pad (600) is 3-6 mm.

5. The tension fitting for stranded carbon fiber composite core conductor according to claim 1, characterized in that: The front end of the middle tapered through hole (221) and the front ends of all the peripheral inclined through holes (222) have rounded corners (240); the rear end of the middle tapered through hole (221) and the rear ends of all the peripheral inclined through holes (222) have rounded corners (240).

6. The tension fitting for stranded carbon fiber composite core conductor according to claim 1, characterized in that: The concave groove (411) of each wedge-shaped clamping block (410) is provided with raised patterns.

7. A method for installing a tension fitting for a stranded carbon fiber composite core conductor according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1), cutting off the aluminum stranded wire (11) at the end of the carbon fiber composite core conductor (10); Step 2), inserting the carbon fiber composite core conductor (10) into the inner lining tube (300), aligning and crimping the rear end of the inner lining tube (300) with the rear end of the aluminum stranded wire (11) of the carbon fiber composite core conductor (10); Step 3), inserting the inner lining tube (300) into the external compression tube (100), separating all the single strands (13) of the carbon fiber composite core conductor (10), inserting one of the single strands (13) into the middle conical through hole (221), and inserting the remaining single strands (13) into the peripheral inclined through holes (222); connecting the external compression tube (100) to the self-tightening sleeve (200); Step 4), inserting a wedge-shaped clamp (400) into each of the outer peripheral inclined through holes (222), and inserting a wedge-shaped clamp (400) into the middle tapered through hole (221), so that the two wedge-shaped clamping blocks (410) of the wedge-shaped clamp (400) clamp the corresponding single strand (13); adjusting all the single strands (13) in the carbon fiber composite core conductor (10) so that all the wedge-shaped clamps (400) are tightened; Step 5), the pressing piece (500) is connected to the external pressure pipe (100) until the rubber pad (600) sleeved on the front end of the pressing piece (500) generates pressure on the wedge-shaped clamp (400).

8. The method for installing a tension fitting for a stranded carbon fiber composite core conductor according to claim 7, characterized in that: In the step 1), after the aluminum strand (11) at the end of the carbon fiber composite core conductor (10) is cut off, the exposed length of the composite core (12) at the end of the carbon fiber composite core conductor (10) is 250 to 300 mm.

9. The method for installing a tension fitting for a stranded carbon fiber composite core conductor according to claim 7, characterized in that: In the step 3), the interval between the rear end of the liner tube (300) and the front end of the self-tightening sleeve (200) is 10 to 15 mm.

10. The method for installing a tension fitting for a stranded carbon fiber composite core conductor according to claim 7, characterized in that: In the step 4), the inner wall of the wedge-shaped clamp (400) is fitted with the outer side surface of the single strand (13) of the composite core (12); the outer wall of the wedge-shaped clamp (400) in the middle conical through hole (221) is fitted with the inner wall of the middle conical through hole (221); and the outer wall of the wedge-shaped clamp (400) in the peripheral inclined through hole (222) is fitted with the inner wall of the peripheral inclined through hole (222).

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