Aluminum alloy extra-high voltage electric power fitting

Abstract

The application discloses a kind of aluminium alloy extra-high voltage electric power fittings, it is related to electric power fittings technical field, including shell, setting in the end of shell tightening nut, coaxially setting in the steel core limit sleeve of shell inside and the helical wire of being threaded in shell inside, the linkage ring of being circumferentially rotatable setting in shell inside is further included in shell;Equal-angle distribution hinged clamping jaw on linkage ring;Guide tooth is set at the front end of clamping jaw;Array is set in the meshing tooth of clamping jaw bottom;Locking drive assembly is set in shell inside based on the axial rotation of tightening nut into push clamping jaw and realize the radial folding of wire clamping locking.The application solves the problem that the existing wire butt joint clamping fitting is mostly with smooth inner wall surface to fit and hold the wire aluminum strand outer circle, it is difficult to adapt to the clearance of wire embedded aluminum strand to form mechanical engagement clamping, and the problem that fretting sliding is easily generated under wind shock condition, aluminum strand wear, wire breakage and fitting loosening are caused by long-term operation.

Description

Technical Field

[0001] This invention relates to the field of power fittings technology, specifically to an aluminum alloy ultra-high voltage power fitting. Background Technology

[0002] Ultra-high voltage (UHV) power fittings are metal connectors used in 1000kV AC, ±800kV and above DC UHV transmission lines and substations. They are mainly used for suspending, anchoring and connecting conductors, bearing the mechanical tension of the line and ensuring current conduction. At the same time, they optimize the electric field and suppress corona discharge through structures such as voltage equalization and shielding. They are characterized by high mechanical strength, stringent electrical performance, smooth surface, corrosion resistance and durability, and are key components to ensure the safe and stable operation of UHV power grids.

[0003] For example, a high-current measuring power fitting for ultra-high voltage direct current transmission projects, disclosed in CN216904220U, includes a sleeve rod one and a sleeve rod two of the same size. A bidirectional lead screw is provided between the sleeve rod one and the sleeve rod two, and the two threaded parts of the bidirectional lead screw are respectively threaded to the open ends of the sleeve rod one and the sleeve rod two. A connecting plate is fixed to one of the opposite ends of the sleeve rod one and the sleeve rod two, and a clamping assembly for fixing the line is provided on the outer wall of the connecting plate. The clamping assembly includes a movable ring inserted into two through holes on the outer wall of the connecting plate and a clamping block detachably connected to the outer wall of the connecting plate. Limiting blocks are connected to both ends of the movable ring. A collar corresponding to the through hole is connected to the inner wall of the connecting plate, and the inner wall of the collar is slidably connected to the outer wall of the horizontal and vertical section of the movable ring. Existing high-current measuring power fittings for ultra-high voltage direct current (UHVDC) transmission projects are simple in structure, highly practical, and functional. Currently, the mainstream conductor clamping fittings used in overhead transmission line projects mainly include four categories: bolt-type tension clamps, hydraulic tension clamps, pre-stretched clamps, and wedge-shaped self-locking clamps. These fittings have undergone long-term engineering practice and have formed a mature technical system and large-scale application, serving as core foundational components to ensure the safe and stable operation of overhead transmission lines. However, during long-term service in complex weather conditions in the field, existing fittings still have some areas for optimization.

[0004] The existing steel-cored aluminum stranded wire uses national standard steel-cored aluminum stranded wire (with continuous spiral grooves formed by the spiral twisting of the outer aluminum strands). However, the existing clamping hardware for wire connection mostly uses a smooth inner wall surface that matches the outer circle of the wire. It can only rely on the clamping pre-tightening force to achieve a surface fit and tight grip with the outer circle of the aluminum strands of the wire. Most of them cannot adapt to the spiral groove structure formed by the stranding of the wire, and it is also difficult to stably embed into the spiral gap between adjacent aluminum strands to form an effective mechanical meshing and locking. Under conditions such as long-term wind vibration and low-frequency galloping at high altitudes, the continuous high-frequency micro-vibration of the wire will cause reciprocating micro-movement relative sliding between the clamping surface of the hardware and the aluminum strands of the wire. After long-term operation, it is easy to cause micro-movement wear, surface scratches and fatigue damage to the aluminum strands, which will lead to problems such as wire strand breakage, loosening of the hardware clamping, and deterioration of electrical current carrying capacity.

[0005] To address the aforementioned issues, there is an urgent need for innovative designs based on existing aluminum alloy ultra-high voltage power fittings. Summary of the Invention

[0006] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. Specifically, the invention aims to provide an aluminum alloy ultra-high voltage power fitting that solves the problems mentioned in the background. Existing conductor clamping fittings often use a smooth inner wall surface to adhere to and hold the outer circumference of the aluminum strands of the conductor, which makes it difficult to adapt to the gaps between the conductors embedded in the aluminum strands to form a mechanical meshing clamp. Under wind and vibration conditions, this can easily lead to micro-slippage, and long-term operation can cause wear of the aluminum strands, breakage of the conductor strands, and loosening of the fittings.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an aluminum alloy ultra-high voltage power fitting, comprising a housing, a tightening nut disposed at the end of the housing, a steel core limiting sleeve coaxially disposed inside the housing, and a spiral conductor passing through the housing; the housing also includes a linkage ring that can be circumferentially rotatable inside the housing.

[0008] Clamping claws are hinged to the linkage ring at equal angles;

[0009] Guide teeth are provided at the front end of the clamping jaws;

[0010] An array of engaging teeth is set at the bottom of the clamping jaws;

[0011] A locking drive assembly installed inside the housing, which uses the axial rotation of a tightening nut to drive the clamping jaws to radially retract, thereby achieving wire clamping and locking.

[0012] An anti-loosening compensation component is installed inside the housing based on an elastic rebound compensation gap to achieve a constant clamping force.

[0013] The locking drive assembly includes a front push ring and a thrust sleeve with a wedge-shaped inner wall arranged sequentially along the axial direction of the outer shell. A limit groove is provided on the inner wall of the outer shell, and a slider that slides in cooperation with the limit groove is provided on the outer wall of the linkage ring. The wedge-shaped inner wall of the thrust sleeve fits against the inclined surface of the clamping claw.

[0014] The anti-loosening compensation component includes a disc spring disposed between two sets of push rings.

[0015] Preferably, the limiting groove is an arc-shaped annular groove, the slider slides with a clearance fit with the inner wall of the limiting groove, and the circumferential rotation angle range of the linkage ring is 12°.

[0016] Preferably, the inner diameter of the steel core limiting sleeve matches the outer diameter of the central steel core of the spiral conductor, and its outer diameter is smaller than the stranded outer diameter of the outer aluminum strands of the spiral conductor.

[0017] Preferably, the disc spring is a multi-disc spring with alternating positive and negative stacking, and the two ends of the disc spring abut against the end faces of the front push rings on both sides.

[0018] Preferably, the front end of the guide tooth is provided with a spiral guide angle of 20° to 30°, and the tilt direction of the guide angle is adapted to the twisting direction of the outer aluminum strands of the spiral wire.

[0019] Preferably, the meshing teeth are V-shaped self-locking inverted cone structures with small ends and large tails, and the tips of the meshing teeth are provided with arc transition surfaces that match the outer circle of the aluminum strands of the spiral wire.

[0020] Preferably, the inclined surface on the back of the clamping claw is at the same angle as the wedge-shaped inner wall of the thrust sleeve.

[0021] Preferably, the clamping claws are provided in 6 sets, which are evenly arrayed and hinged along the circumference of the linkage ring at 60°, and the hinge axis of the clamping claws is parallel to the axis of the helical guide wire.

[0022] Preferably, the inner wall of the outer casing is provided with an axial limiting step, and the outer wall of the front push ring is in sliding fit with the inner wall of the outer casing. The axial limiting step is used to limit the maximum pushing stroke of the front push ring.

[0023] Preferably, the outer shell, linkage ring, and clamping claws are all made of high-strength aluminum alloy, and the surface of the meshing teeth of the clamping claws is hardened and wear-resistant.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. When the spiral wire is inserted into the outer shell, the aluminum strand of the wire contacts the guide teeth at the front end of the clamping claw, which drives the linkage ring to rotate circumferentially along the limiting groove of the outer shell through the slider. This causes the meshing teeth on the inner side of the claw to automatically align with the spiral groove of the wire. The tightening nut pushes the front push ring and the thrust sleeve to feed axially. The wedge-shaped inner wall of the thrust sleeve presses the inclined surface on the back of the claw, driving the circumferential array of claws to retract radially. This can adaptively and securely clamp wires with different radii and outer diameters. The meshing teeth are embedded in the spiral groove to form a mechanical meshing lock. Combined with the V-shaped self-locking inverted cone with a small end and a large tail of the teeth, it achieves unidirectional tightening as it is pulled, solving the problems of slippage, loosening, and poor versatility of existing hardware friction clamping.

[0026] 2. This invention utilizes a disc spring structure between two sets of front push rings. After the fitting is locked, the disc spring is in a pre-compressed state and provides a stable elastic preload. During long-term high-altitude service of the fitting, when encountering weather conditions such as wind vibration or low-frequency vibration, or when clamping gaps are caused by fretting wear of components due to long-term operation, the disc spring can continuously push the front push ring and the thrust sleeve axially through its own elastic rebound, automatically compensating for the clamping gap. This keeps the clamping claws in a radially retracted state, ensuring that the meshing teeth and the spiral groove of the wire maintain a tight surface contact, thus avoiding the problem of clamping force attenuation over time. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the power fittings of the present invention.

[0028] Figure 2 This is a cross-sectional view of the outer casing of the power fitting structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the internal structure of the power fittings of the present invention.

[0030] Figure 4 This is a schematic diagram of the outer shell structure of the present invention.

[0031] Figure 5 This is a schematic diagram of the clamping claw inside the outer shell of the present invention.

[0032] Figure 6 This is a schematic diagram of the adaptive clamping structure of the present invention.

[0033] Figure 7 This is a schematic diagram of the clamping claw of the present invention.

[0034] Figure 8 This is a schematic diagram of the clamping claw of the present invention from another angle.

[0035] Figure 9 for Figure 4 An enlarged schematic diagram of the structure at point A.

[0036] In the diagram: 1. Outer shell; 101. Limiting groove; 2. Tightening nut; 3. Spiral wire; 4. Steel core limiting sleeve; 5. Push ring; 6. Disc spring; 7. Thrust sleeve; 8. Linkage ring; 801. Slider; 9. Clamping claw; 901. Guide tooth; 902. Engaging tooth. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1 to 9 The present invention provides a technical solution: an aluminum alloy ultra-high voltage power fitting, including a housing 1, a tightening nut 2 disposed at the end of the housing 1, a steel core limiting sleeve 4 coaxially disposed inside the housing 1, and a spiral wire 3 passing through the housing 1. The housing 1 also includes a linkage ring 8 that can be circumferentially rotatably disposed inside the housing 1.

[0039] Clamping claws 9 are hinged to the linkage ring 8 at equal angles;

[0040] Guide teeth 901 are provided at the front end of the clamping claw 9;

[0041] An array of engaging teeth 902 is arranged at the bottom of the clamping claw 9;

[0042] A locking drive assembly is installed inside the housing 1, which uses the axial rotation of the tightening nut 2 to push the clamping claw 9 to radially retract in order to achieve wire clamping and locking.

[0043] An anti-loosening compensation component is installed inside the housing 1 to achieve constant clamping force by using an elastic rebound compensation gap;

[0044] The locking drive assembly includes a front push ring 5 and a thrust sleeve 7 with a wedge-shaped inner wall arranged sequentially along the axial direction of the housing 1. A limit groove 101 is provided on the inner wall of the housing 1. A slider 801 that slides in cooperation with the limit groove 101 is provided on the outer wall of the linkage ring 8. The wedge-shaped inner wall of the thrust sleeve 7 is in contact with the inclined surface of the clamping claw 9.

[0045] The anti-loosening compensation component includes a disc spring 6 disposed between the two sets of front push rings 5.

[0046] In this embodiment, when the spiral wire 3 is inserted into the housing 1, the end of the wire first contacts the steel core limiting sleeve 4 to complete the centering positioning. The spiral aluminum strands on the outer wall of the wire contact the guide teeth 901, and the driving linkage ring 8 rotates circumferentially along the limiting groove 101 through the slider 801, so that the meshing teeth 902 are aligned with the spiral groove of the wire. When the nut 2 is screwed in and tightened, the front push ring 5 is pushed to move axially, which drives the thrust sleeve 7 to squeeze the inclined surface of the clamping claw 9, so that the clamping claw 9 is radially closed, and the meshing teeth 902 are embedded in the spiral groove of the wire to achieve mechanical meshing and locking. When a clamping gap occurs during long-term operation, the disc spring 6 pushes the front push ring 5 and the thrust sleeve 7 to compensate for the gap through elastic rebound, so that the clamping claw 9 always maintains stable clamping and eliminates the risk of micro-motion wear and loosening under wind and vibration conditions.

[0047] The limiting groove 101 is an arc-shaped annular groove. The slider 801 slides with the inner wall of the limiting groove 101 with clearance. The circumferential rotation angle range of the linkage ring 8 is 12°.

[0048] In this embodiment, the mating structure of the arc-shaped groove and the slider 801 can provide precise limiting guidance for the circumferential rotation of the linkage ring 8, preventing the linkage ring 8 from radially moving. At the same time, the 12° rotation range can completely cover the spiral helix angle range of the national standard steel-cored aluminum stranded wire, ensuring that the guide tooth 901 can smoothly drive the linkage ring 8 to rotate, so that the meshing tooth 902 is precisely aligned with the spiral groove of the spiral wire 3, avoiding the problems of jamming and misalignment.

[0049] The inner diameter of the steel core limiting sleeve 4 matches the outer diameter of the center steel core of the spiral conductor 3, and its outer diameter is smaller than the stranded outer diameter of the outer aluminum strands of the spiral conductor 3.

[0050] In this embodiment, the steel core limiting sleeve 4 can precisely limit the insertion depth of the spiral wire 3. When the wire is inserted, the central steel core can be embedded in the inner ring of the steel core limiting sleeve 4 to achieve center positioning. At the same time, the outer ring can isolate the outer aluminum strands to avoid misalignment of the meshing teeth 902 caused by excessive insertion of the aluminum strands, and ensure the alignment accuracy of the meshing teeth 902 and the spiral groove after the wire is inserted.

[0051] The disc spring 6 is a multi-disc spring with alternating positive and negative stacking. The two ends of the disc spring 6 abut against the end faces of the front push rings 5 ​​on both sides.

[0052] In this embodiment, the alternating stacked disc springs 6 can provide a longer compensation stroke and a stable elastic preload. When wear and gaps occur during long-term operation of the fittings, they can push the front push ring 5 and the thrust sleeve 7 to move through their own elastic rebound, continuously compensating for the clamping gap and ensuring that the clamping force of the clamping claw 9 on the spiral wire 3 is always stable, thus avoiding the problem of clamping loosening under wind and vibration conditions.

[0053] The front end of the guide tooth 901 is provided with a spiral guide angle of 20°~30°, and the tilt direction of the guide angle is adapted to the twisting direction of the outer aluminum strand of the spiral wire 3.

[0054] In this embodiment, the spiral guide angle can form a smooth guiding fit with the spiral surface of the outer aluminum strand during the insertion of the wire, converting the axial insertion force of the wire into the circumferential rotational force of the linkage ring 8, automatically driving the linkage ring 8 to rotate. This achieves precise alignment of the meshing teeth 902 and the spiral groove without manual alignment, greatly improving the convenience of on-site construction.

[0055] The meshing tooth 902 is a V-shaped self-locking inverted cone structure with a small end and a large tail. The tip of the meshing tooth 902 is provided with an arc transition surface that matches the outer circle of the aluminum strand of the spiral wire 3.

[0056] In this embodiment, the inverted cone structure with a small end and a large tail can achieve one-way self-locking. When the wire is under tension, the meshing teeth 902 will wedge tighter and tighter in the spiral groove, fundamentally preventing the wire from loosening. The arc transition surface of the tooth tip can form a surface contact with the outer circle of the aluminum strand, avoiding stress concentration and damage to the aluminum strand. At the same time, it increases the meshing contact area and improves the reliability of clamping and locking.

[0057] The inclined surface on the back of the clamping claw 9 is at the same angle as the wedge-shaped inner wall of the thrust sleeve 7.

[0058] In this embodiment, the same tilt angle ensures that when the thrust sleeve 7 is pushed axially, the wedge-shaped inner wall and the inclined surface form a complete surface contact fit, and the axial screwing force of the tightening nut 2 is uniformly converted into the radial closing force of the clamping claw 9, avoiding the deformation and jamming of the claw due to uneven local force. At the same time, in conjunction with the self-locking angle design, the wedge-shaped self-locking of the clamping structure is realized, further improving the anti-loosening effect.

[0059] The clamping claws 9 are provided in 6 sets, which are evenly arrayed and hinged along the circumference of the linkage ring 8 at 60°. The hinge axis of the clamping claws 9 is parallel to the axis of the spiral guide wire 3.

[0060] In this embodiment, the layout of the 6 sets of jaws in a 60° uniform array corresponds one-to-one with the 6 spiral grooves formed by the 6 aluminum strands on the outer layer of the national standard steel-cored aluminum stranded wire. This ensures that the meshing teeth 902 of each set of clamping jaws 9 can accurately engage in the corresponding spiral grooves, achieving uniform force distribution in the circumference and improving the stability and coaxiality of the wire clamping. The hinge axis parallel to the wire axis ensures the smoothness of the radial retraction action of the clamping jaws 9 and avoids interference in the action.

[0061] The inner wall of the outer casing 1 is provided with an axial limiting step, and the outer wall of the front push ring 5 is in sliding fit with the inner wall of the outer casing 1. The axial limiting step is used to limit the maximum pushing stroke of the front push ring 5.

[0062] In this embodiment, the axial limiting step can rigidly limit the advancing position of the front push ring 5, avoiding the problem of excessive tightening of the nut 2 during construction, which would cause the clamping claw 9 to retract excessively and crush the aluminum strand. At the same time, it can ensure that the disc spring 6 is always within a reasonable compression range, ensuring the long-term effectiveness of its elastic compensation function.

[0063] The outer shell 1, the linkage ring 8, and the clamping claw 9 are all made of high-strength aluminum alloy, and the surface of the meshing teeth 902 of the clamping claw 9 is hardened and wear-resistant.

[0064] In this embodiment, the high-strength aluminum alloy material can significantly reduce the overall weight of the fitting while ensuring its mechanical strength, thus meeting the lightweight design requirements of ultra-high voltage transmission lines. The hardened and wear-resistant treatment on the surface of the meshing teeth 902 can improve the wear resistance of the teeth, avoid fretting wear under long-term wind and vibration conditions, and extend the overall service life of the fitting.

[0065] Working principle: When using this aluminum alloy UHV power fitting, first connect one end of the outer shell 1 to the splicing fitting or tower fixing structure of the transmission line, and pre-fit the tightening nut 2 onto the end of the spiral conductor 3 to be spliced.

[0066] When wire clamping and splicing is required, the spiral wire 3 is coaxially inserted from the open end of the outer shell 1. The spiral wire 3 continues to be pushed inward, and its central steel core is first embedded into the inner ring of the steel core limiting sleeve 4 to achieve the centering positioning of the wire. The outer ring of the steel core limiting sleeve 4 forms a limit on the outer aluminum strands to prevent the wire from being over-inserted. During this process, the spiral surface of the outer aluminum strands of the spiral wire 3 contacts the guide tooth 901 at the front end of the clamping claw 9. The spiral guide angle at the front end of the guide tooth 901 converts the axial insertion force of the wire into a circumferential thrust, which drives the clamping claw 9 and the linkage ring 8 to rotate synchronously. The slider 801 on the outer wall of the linkage ring 8 slides along the limiting groove 101 on the inner wall of the outer shell 1 to provide guidance and limit for the rotation until the meshing teeth 902 on the inner side of the clamping claw 9 are precisely aligned with the spiral groove between the outer aluminum strands of the spiral wire 3.

[0067] After alignment, rotate the tightening nut 2 to make it screw inward along the external thread at the end of the outer shell 1. The end of the tightening nut 2 pushes the front push ring 5 to move inward along the inner wall of the outer shell 1. The front push ring 5 simultaneously pushes the disc spring 6 and the other front push ring 5 to move, thereby driving the thrust sleeve 7 to move inward axially. The wedge-shaped inner wall of the thrust sleeve 7 fits and presses against the inclined surface on the back of the clamping claw 9, converting the axial thrust into a radial closing force, pushing the circumferential array of clamping claws 9 to move inward radially around the hinge point, so that the meshing teeth 902 are completely embedded in the spiral groove of the spiral wire 3, realizing mechanical meshing and locking with the aluminum strand. When the thrust sleeve 7 is pushed to the axial limit step of the inner wall of the outer shell 1, the maximum locking stroke is reached. At this time, the disc spring 6 is in a pre-compressed state, providing a stable elastic pre-tightening force for the clamping structure.

[0068] During long-term high-altitude service of the fittings, when encountering weather conditions such as wind vibration and galloping, or when fretting wear occurs due to long-term operation leading to clamping gaps, the disc spring 6 can use its own elastic rebound to push the front push ring 5 and the thrust sleeve 7 on both sides to continuously feed axially, automatically compensating for the clamping gaps. This ensures that the meshing teeth 902 of the clamping claw 9 always maintain a tight meshing clamping state with the spiral groove of the spiral conductor 3, fundamentally eliminating the problem of fretting slippage and wear caused by gaps between the conductor and the fittings. This avoids safety hazards such as aluminum strand wear, conductor strand breakage, and fitting loosening, ensuring the long-term safe and stable operation of the UHV transmission line.

[0069] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aluminum alloy ultra-high voltage power fitting, comprising a housing (1), a tightening nut (2) disposed at the end of the housing (1), a steel core limiting sleeve (4) coaxially disposed inside the housing (1), and a spiral conductor (3) passing through the housing (1), characterized in that: The outer shell (1) also includes a linkage ring (8) that can be rotatably disposed inside the outer shell (1). Clamping claws (9) are hinged to the linkage ring (8) at equal angles; Guide teeth (901) are provided at the front end of the clamping claw (9); The array is set at the bottom of the clamping claw (9) with engaging teeth (902); A locking drive assembly is set inside the housing (1) based on the axial rotation of the tightening nut (2) to push the clamping claw (9) to radially retract in order to achieve wire clamping and locking; An anti-loosening compensation component is installed inside the outer shell (1) to achieve constant clamping force by using an elastic rebound compensation gap; The locking drive assembly includes a front push ring (5) arranged sequentially along the axial direction of the outer shell (1) and a thrust sleeve (7) with a wedge-shaped inner wall. A limit groove (101) is provided on the inner wall of the outer shell (1). A slider (801) is provided on the outer wall of the linkage ring (8) and slides in cooperation with the limit groove (101). The wedge-shaped inner wall of the thrust sleeve (7) is in contact with the inclined surface of the clamping claw (9). The anti-loosening compensation component includes a disc spring (6) disposed between two sets of push rings (5).

2. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The limiting groove (101) is an arc-shaped annular groove, and the slider (801) slides with the inner wall of the limiting groove (101) with a clearance. The circumferential rotation angle range of the linkage ring (8) is 12°.

3. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The inner diameter of the steel core limiting sleeve (4) matches the outer diameter of the center steel core of the spiral conductor (3), and its outer diameter is smaller than the stranded outer diameter of the outer aluminum strands of the spiral conductor (3).

4. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The disc spring (6) is a multi-piece disc spring stacked alternately in opposite directions, and the two ends of the disc spring (6) abut against the end faces of the front push rings (5) on both sides respectively.

5. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The front end of the guide tooth (901) is provided with a spiral guide angle of 20°~30°, and the tilt direction of the guide angle is adapted to the twisting direction of the outer aluminum strand of the spiral wire (3).

6. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The meshing tooth (902) is a V-shaped self-locking inverted cone structure with a small end and a large tail. The tip of the meshing tooth (902) is provided with an arc transition surface that matches the outer circle of the aluminum strand of the spiral wire (3).

7. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The inclined surface on the back of the clamping claw (9) is at the same angle as the wedge-shaped inner wall of the thrust sleeve (7).

8. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The clamping claws (9) are provided in 6 sets, which are evenly arrayed and hinged along the circumference of the linkage ring (8) at 60°. The hinge axis of the clamping claws (9) is parallel to the axis of the spiral guide wire (3).

9. The aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The inner wall of the outer shell (1) is provided with an axial limiting step, and the outer wall of the front push ring (5) is in sliding fit with the inner wall of the outer shell (1). The axial limiting step is used to limit the maximum propulsion stroke of the front push ring (5).

10. An aluminum alloy ultra-high voltage power fitting according to claim 1, characterized in that: The outer shell (1), linkage ring (8), and clamping claw (9) are all made of high-strength aluminum alloy. The surface of the meshing teeth (902) of the clamping claw (9) is hardened and wear-resistant.

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