Composite high-speed rail dropper resistant to cyclic load and crimping system

Abstract

The invention provides a composite high-speed rail dropper resistant to cyclic load. The composite high-speed rail dropper resistant to cyclic load has high fatigue resistance, corrosion resistance, cyclic load resistance and excellent electromechanical performance and can adapt to high-speed dynamic working conditions. The system comprises a central unit which is composed of at least one group of first composite units; the peripheral twisting assembly comprises a plurality of groups of second composite units with the same equivalent diameter; a plurality of the second composite units and the shaped composite stranded wires are annularly distributed on the periphery of the central unit, each of the first composite units and the second composite units is of a 1 + 6 stranded wire structure formed by seven corresponding equal-diameter units, and each of the first composite units and the second composite units comprises at least one group of filament stranded structures; and the corresponding filament twisting structure is a 1 + 6 twisted wire structure formed by twisting seven filaments with the same diameter.

Description

Technical Field

[0001] This invention relates to the technical field of dropper wire structures, specifically a composite high-speed rail dropper wire resistant to cyclic loads. This invention also provides a high-speed rail dropper wire crimping system. Background Technology

[0002] With the rapid development of high-speed railways in my country, the catenary droppers, as the core force-transmitting component of the pantograph-catenary system, directly affect the current collection quality and operational safety of trains. However, existing integral droppers for high-speed railway catenaries generally suffer from the following technical challenges in actual operation: 1. Fatigue fracture caused by defects in the crimping process Existing dropper wire crimping commonly employs dog-tooth three-point crimping or ring crimping processes, leading to stress concentration at the ends of the crimped tube and the crimped terminal tube. Studies show that when dropper wires are repeatedly bent under dynamic loads, the crimped joint generates additional bending moment due to the point contact mode, resulting in uneven stress on individual wires and accelerating strand breakage and wire breakage. For example, at a speed of 350 km / h, the vibration frequency at the root of the crimped tube reaches more than 20 bends per pantograph pass, while the traditional crimping process results in a dropper wire damage rate as high as 17%, far exceeding the 4% of the ring crimping process. 2. Defects caused by limitations in materials and structural design Current dropper wires (such as JTMH10 copper-magnesium alloy stranded wire) are prone to lattice distortion and decreased fatigue resistance under long-term electrolytic corrosion, acid rain environments, and high current loads. Simultaneously, wear at the contact surface between the core ring and the clamp eye leads to crack propagation, further reducing service life. Statistics show that approximately 54.3% of fracture failures originate from wire breakage at the crimp joint, and 13.6% are caused by cracks in the core ring. 3. Insufficient dynamic load sensitivity and standard adaptation When train speeds exceed 300 km / h, the dynamic load on the droppers is proportional to the square of the speed, making it difficult for traditional crimping processes to meet the high-cycle fatigue life requirements of the EN50119 standard. Tests show that for every 10 km / h increase in speed, dropper performance degrades by 30%, and the probability of fatigue failure at the mid-span is significantly higher than in other areas. Furthermore, existing crimping equipment lacks a precise crimping force monitoring system, resulting in large variations in crimping quality and making it unsuitable for high-frequency dynamic load environments. 4. High operation and maintenance costs and security risks Due to the aforementioned problems, the replacement cycle of overhead contact line droppers on high-speed railways has been significantly shortened. Taking the Beijing-Guangzhou high-speed railway as an example, in 2015, the number of dropper strand breakage failures surged by 70% year-on-year, increasing the average annual maintenance cost by over ten million yuan. Frequent replacements not only occupy maintenance windows but also threaten train operation safety, necessitating improvements in cyclic load resistance performance from the fundamental technological aspects.

[0003] In summary, existing crimping systems have significant shortcomings in terms of dynamic stress distribution, material fatigue resistance, and process control precision. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a composite high-speed rail dropper that is resistant to cyclic loads, possessing high fatigue resistance, corrosion resistance, cyclic load resistance, excellent electromechanical properties, and the ability to adapt to high-speed dynamic operating conditions.

[0005] A composite high-speed rail dropper cable resistant to cyclic loads, characterized in that it comprises: The central unit is composed of at least one set of the first composite units; And the peripheral stranding assembly, which includes several sets of second composite units with the same equivalent diameter; The outer periphery of the central unit is provided with several second composite units and composite stranded wires. The first composite unit and the second composite unit are each composed of 7 corresponding equal diameter units forming a 1+6 stranded wire structure. The first composite unit and the second composite unit include at least one set of filament stranding structure. The corresponding filament stranding structure is 7 equal diameter filaments stranded together to form a 1+6 stranded wire structure.

[0006] Its further features are: Both the first composite unit and the second composite unit are composed of seven sets of fine filament twisted structures forming a 1+6 twisted wire structure. At this time, the central unit and the outer twisted assembly are both composite units formed by twisting fine filament twisted structures. When the first composite unit and the second composite unit include at least one thick filament, the diameter of the thick filament is equal to the equivalent diameter of the stranded filament structure; Preferably, the first composite unit and the second composite unit include four fine filament twisted structures and three thick filaments. The center of the composite unit is a fine filament twisted structure, and the other three sets of fine filament twisted structures and thick filaments are arranged at staggered intervals on the outer periphery of the fine filament twisted structure at the center position, twisted together to form a 1+6 twisted wire structure. The cross-sectional area of ​​the suspension wire is 10 mm. 2 12 mm 2 16mm 2 ; When the cross-sectional area of ​​the suspension wire is 10 mm 2 At this time, the central unit is a set of composite units, and the outer stranding assembly is six sets of composite units, which together form a 1+6 composite stranded wire structure. When the cross-sectional area of ​​the suspension wire is 12 mm 2 At that time, the central unit is a group of first composite units, and the outer stranding assembly is six groups of second composite units, which together form a 1+6 composite stranded wire structure. When the cross-sectional area of ​​the suspension wire is 16mm² 2At that time, the central unit consists of three sets of composite units, and the outer stranded assembly consists of nine sets of composite units. The three sets of composite units are stranded together to form the central unit, and the nine sets of composite units are stranded around the outer periphery of the central unit to form a composite stranded wire structure. Used to form 10mm 2 16mm 2 The diameter of each thick wire in the suspension wire is 0.5 mm; the diameter of each thin wire is 0.167 mm. Used to form 12mm 2 The diameter of each thick wire in the central unit of the suspension wire is 0.65 mm, and the diameter of each thin wire is 0.217 mm; while the diameter of each thick wire in the outer stranded assembly is 0.54 mm, and the diameter of each thin wire is 0.18 mm.

[0007] A high-speed rail dropper wire crimping system, characterized in that it comprises: Two sets of heart-shaped rings; Several sets of clamped tubes, each set of clamped tubes includes two annular ends and a central annular honeycomb body, wherein the two ends of the central annular honeycomb body are respectively provided with annular ends; Drop wire; And two sets of crimp terminals, including crimp ends and inlet ends; The upper end of the drop wire wraps around the upper heart-shaped ring in the longitudinal direction to form an upper crimping section and extends outward to be inserted into the crimping end of the upper crimping terminal. The lower end of the drop wire wraps around the lower heart-shaped ring in the longitudinal direction to form a lower crimping section and extends outward to be inserted into the crimping end of the lower crimping terminal. The upper crimping section includes two overlapping sections of partial drop wires, which are crimped together by two sets of spaced-apart crimping tubes. The lower crimping section includes two overlapping sections of partial drop wires, which are crimped together by two sets of spaced-apart crimping tubes. The crimping position of the crimping tubes is concentrated in the central annular honeycomb structure. When the drop wire is subjected to uneven stress, some of the stress is transferred to the central annular honeycomb structure, which allows the stress to be reliably released within the honeycomb structure. Because the honeycomb structure has many connections, it will gradually release the stress to each honeycomb edge, thus ensuring reliable stress release.

[0008] Its further features are: It also includes two auxiliary lines, which are cut sections of the same diameter dropper wire. Each auxiliary line is located in the corresponding length area of ​​the upper and lower crimping sections. Both the two local dropper wires and the auxiliary lines are located inside the corresponding clamping tubes. The two sets of clamping tubes are spaced apart and press the outer periphery of the three dropper wires that form an equivalent circle. When the dropper wires are subjected to uneven stress, some of the stress is transferred to the auxiliary lines. Since both ends of the auxiliary lines are exposed, they can effectively release some stress. Moreover, the equivalent circle formed by the three dropper wires makes the pressing of the clamping tubes more stable and reliable. The outer peripheral groove of the heart ring is used to embed the dropper wire. The heart ring includes a sealing surface, which is located at the outer peripheral closed position of the heart ring for connecting the catenary dropper wire clamp or the contact wire dropper wire clamp. The inner edge of the heart ring corresponding to the sealing surface is embedded with a number of graphite pillars. The graphite pillars contact the catenary dropper wire clamp or the contact wire dropper wire clamp to form a self-lubricating body, which reduces wear, increases tensile strength, and reduces the risk of strain fracture of the heart ring. The crimping end of the crimping terminal is an annular honeycomb structure; When two sets of clamped tubes are crimped, the two sets of clamped tubes are intermittently crimped in opposite directions, with the same number of canine teeth on each side. With the help of auxiliary lines, the crimping is made more round and the stress distribution is more uniform, thereby decomposing the stress concentration in the crimping end area of ​​a single tube, eliminating internal stress, and reducing fatigue fracture at the end of the dropper clamped tube.

[0009] After adopting the present invention, the dropper wire has the following beneficial effects: 1. Improved tensile strength and fatigue resistance: The dropper wire is made of multiple strands twisted together, which makes the stress distribution uniform and significantly improves the overall tensile strength. At the same time, the twisted structure can reduce the risk of fatigue fracture of a single wire when bending. 2. Optimized flexibility: Compared to solid wire made of a single material, the multi-strand stranded structure allows for greater bending angles without damaging the conductor, making it especially suitable for the complex environment of high-speed railways; 3. Balance between conductivity and heat dissipation: Improved skin effect - In high-frequency or high-current scenarios, the multi-strand structure of stranded wires can reduce the skin effect (the phenomenon of current concentration on the conductor surface) and reduce energy loss; Heat dissipation efficiency - The tiny gaps between the strands help heat dissipation, avoid local overheating, and extend the life of the dropper.

[0010] 4. Enhanced reliability: Vibration resistance and fault tolerance - If one of the copper wires or strands breaks, the other wires can still maintain current transmission, resulting in higher system reliability; cross-twisting reduces gaps on the outer surface of the conductor and improves surface roundness. Attached Figure Description

[0011] Figure 1 The cross-sectional area of ​​the suspension wire in this invention is 10 mm. 2 12 mm 2 Structural sectional view; Figure 2 for Figure 1 The corresponding dropper wire stranding and forming process diagram; Figure 3 The cross-sectional area of ​​the dropper wire in this invention is 16mm². 2 Structural sectional view; Figure 4 This is a simplified schematic diagram of the crimping system of the present invention; Figure 5This is a front view of the core ring of the crimping system of the present invention; Figure 6 This is a side view of the core ring of the crimping system of the present invention; Figure 7 This is a perspective view of the crimping tube of the crimping system of the present invention; Figure 8 This is a front view of the crimping terminal of the crimping system of the present invention; Figure 9 A perspective view of the annular honeycomb structure of the crimping terminal constituting the crimping system of the present invention; The names corresponding to the serial numbers in the diagram are as follows: Central unit 10, peripheral twisted assembly 20, composite unit 30, fine filament twisted structure 40, fine filament 41, coarse filament 50; 1. Heart-shaped ring, 11. Graphite column, 12. Sealing surface, 2. Crimping tube, 21. Ring end, 22. Middle ring honeycomb body, 3. Suspension wire, 4. Crimping terminal, 5. Crimping end, 51. Inlet end, 52. Upper crimping section, 6. Lower crimping section. Detailed Implementation

[0012] A composite high-speed rail dropper cable resistant to cyclic loads, see Figures 1-3 It includes a central unit 10 and an outer twisting assembly 20; The outer stranding assembly 20 includes several sets of composite units 30 with the same equivalent diameter; The central unit 10 is composed of at least one set of composite units 30. Several composite units 30 and composite stranded wires are arranged around the outer periphery of the central unit 10. The composite unit 30 is composed of 7 units of equal diameter forming a 1+6 stranded wire structure. The composite unit 30 includes at least one set of fine wire stranding structure 40. The fine wire stranding structure 40 is formed by stranding 7 fine wires 41 of equal diameter to form a 1+6 stranded wire structure.

[0013] In specific implementation, the composite unit 30 includes four fine filament twisted structures 40 and three thick filaments 50. The center of the composite unit 30 is the fine filament twisted structure 40, and the other three sets of fine filament twisted structures 40 and thick filaments 50 are arranged at staggered intervals on the outer periphery of the fine filament twisted structure at the center position, twisting together to form a 1+6 twisted wire structure.

[0014] In practice, the cross-sectional area of ​​the suspension wire is 10 mm². 2 12 mm 2 16mm 2 ; When the cross-sectional area of ​​the suspension wire is 10 mm 2 12 mm 2 At this time, the central unit 10 is a group of composite units, and the outer stranding assembly 20 is six groups of composite units, which together form a 1+6 composite stranded wire structure. The stranding process is described in [link to documentation]. Figure 2 ; When the cross-sectional area of ​​the suspension wire is 16mm² 2 At that time, the central unit 10 consists of three composite units, the outer stranding assembly 20 consists of nine composite units, the three composite units 30 are stranded together to form the central unit 10, and the nine composite units 30 are stranded around the outer periphery of the central unit 10 to form a composite stranded wire structure. Used to form 10mm 2 16mm 2 The diameter of each thick wire 50 in the suspension wire is 0.5mm; the diameter of each thin wire 41 is 0.167mm. Used to form 12mm 2 The diameter of each thick wire 50 in the center unit of the suspension wire is 0.65mm, and the diameter of each thin wire 41 is 0.217mm; while the diameter of each thick wire 50 in the outer stranded assembly is 0.54mm, and the diameter of each thin wire 41 is 0.18mm.

[0015] Each thick filament 50 and thin filament 40 adopts a two-stage three-stage DC online annealing and each strand strand is further annealed and softened by the twisting unit. In practice, all coarse filament 50 and fine filament 41 are made of the same material, and the following two schemes are adopted: Option 1 - Brass: Its composition is Mg: 0.2-0.4wt%, Zn: 4-8wt%, with the balance being Cu and unavoidable impurities, and the total amount of unavoidable impurities ≦0.10wt%. The surface is treated with nickel or tin plating, with a plating layer of 5-10µm. Option 2 - Bronze: Its composition is Mg: 0.2-0.4wt%, Sn: 1-3wt%, with the balance being Cu and unavoidable impurities, and the total amount of unavoidable impurity elements is ≤0.10wt%, with no surface treatment.

[0016] The drop wire has the following beneficial effects: 1. Improved tensile strength and fatigue resistance: The dropper wire is made of multiple strands twisted together, which makes the stress distribution uniform and significantly improves the overall tensile strength. At the same time, the twisted structure can reduce the risk of fatigue fracture of a single wire when bending. 2. Optimized flexibility: Compared to solid wire made of a single material, the multi-strand stranded structure allows for greater bending angles without damaging the conductor, making it especially suitable for the complex environment of high-speed railways; 3. Balance between conductivity and heat dissipation: Improved skin effect - In high-frequency or high-current scenarios, the multi-strand structure of stranded wires can reduce the skin effect (the phenomenon of current concentration on the conductor surface) and reduce energy loss; Heat dissipation efficiency - The tiny gaps between the strands help heat dissipation, avoid local overheating, and extend the life of the dropper.

[0017] 4. Enhanced reliability: Vibration resistance and fault tolerance - If one of the copper wires or strands breaks, the other wires can still maintain current transmission, resulting in higher system reliability; cross-twisting reduces gaps on the outer surface of the conductor and improves surface roundness. 5. Tin plating or nickel plating on the surface of the wire can balance conductivity, corrosion resistance and economy; 6. Stranding the wires of the same diameter avoids the possibility of internal stress caused by the difference in thermal expansion between the two types of wires.

[0018] A high-speed rail dropper crimping system, see Figures 4-9 It includes two sets of heart rings 1, several sets of crimp tubes 2, suspension wires 3, and two sets of crimp terminals 5; Each set of clamping tubes 2 includes two annular ends 21 and a middle annular honeycomb body 22, with annular ends 21 respectively provided at both ends of the middle annular honeycomb body 22; Each set of crimp terminals 5 includes a crimp terminal 51 and an inlet terminal 52; The upper end of the drop wire 3 wraps around the upper heart-shaped ring 1 to form an upper crimping section 6 and extends outward to be inserted into the crimping end 51 of the upper crimping terminal 5. The lower end of the drop wire wraps around the lower heart-shaped ring 1 to form a lower crimping section 7 and extends outward to be inserted into the crimping end 51 of the lower crimping terminal 5. The upper crimping section 6 includes two overlapping sections of drop wire 3, which are crimped together by two sets of spaced-apart crimping tubes 2. The lower crimping section 7 includes two overlapping sections of drop wire 3, which are crimped together by two sets of spaced-apart crimping tubes 6. The crimping position of the crimping tubes 6 is concentrated in the middle annular honeycomb body 22. When the suspension wire 3 receives uneven stress, part of the stress is transferred to the central annular honeycomb 22, which allows the stress to be reliably released within the honeycomb. Because the honeycomb has many connections, it will gradually release the stress to each honeycomb edge, thus ensuring reliable stress release.

[0019] In a specific embodiment, it also includes two auxiliary lines 4, which are cut sections of the same diameter dropper wire. Each auxiliary line 4 is located in the corresponding length region of the upper crimping section 6 and the lower crimping section 7. The two local dropper wires and the auxiliary lines 4 are all located in the inner cavity of the corresponding clamping tube 2. The two sets of clamping tubes 2 are spaced apart and press the outer periphery of the three dropper wires that form an equivalent circle. When the dropper wire 3 receives uneven stress, part of the stress is transferred to the auxiliary line 4. Since both ends of the auxiliary line 4 are exposed, it can effectively release part of the stress. Moreover, the equivalent circle formed by the three dropper wires makes the pressing of the clamping tube more stable and reliable.

[0020] In a specific embodiment, the outer peripheral groove of the heart ring 1 is used to embed the dropper wire 3. The heart ring 1 includes a sealing surface 12, which is located at the outer peripheral closed position of the heart ring 1 for connecting the catenary dropper wire clamp or the contact wire dropper wire clamp. The inner edge of the heart ring corresponding to the sealing surface 12 is embedded with a plurality of graphite pillars 11. The graphite pillars 11 contact the catenary dropper wire clamp or the contact wire dropper wire clamp to form a self-lubricating body, which reduces wear, increases tensile strength, and reduces the risk of strain fracture of the heart ring.

[0021] In a specific embodiment, the crimping end 51 of the crimping terminal 5 is an annular honeycomb structure.

[0022] When the two sets of clamping tubes 2 are crimped, the two sets of clamping tubes 2 are intermittently crimped in opposite directions, with the same number of canine teeth on each side. With the help of the auxiliary line 4, the crimping is made more round and the stress distribution is more uniform, thereby decomposing the stress concentration in the crimping end area of ​​the single tube, eliminating internal stress, and reducing fatigue fracture at the end of the clamping tube of the dropper.

[0023] In specific implementation, the material of the heart ring 1 is CuMg0.5 wt% or CuNi2Si; the material of the clamping tube 2 and the terminal 5 is T2 copper, with nickel or tin plating on the surface; both ends of the crimped suspension wire 3 are crimped with two sections of dog tooth-shaped three-point crimping through the auxiliary line 4 using double clamping tube 2, with the two sets of clamping tubes 2 crimped in opposite directions, and the number of crimping points on each side is the same.

[0024] The adoption of the high-speed rail dropper wire crimping system has the following beneficial effects: 1. The core ring material uses CuMg0.5 wt% or CuNi2Si instead of the traditional 12Cr18Ni9 material: The copper-magnesium alloy has both high conductivity (about 60% IACS) and tensile strength (≥550 MPa), and its wear resistance is better than that of the traditional copper-silver alloy. In addition, the upward continuous casting + continuous extrusion process replaces the continuous casting and rolling process, which makes the metal grains finer (grain size is one millionth of that of foreign products), improving toughness and fatigue resistance; the copper-nickel-silicon alloy (CuNi2Si) has been used in components such as contact wire dropper clamps. Its conductivity and mechanical strength are well balanced. When used in core rings, it can improve the overall conductivity and reduce the risk of electric sparks. 2. The contact surface of the semi-sealed heart-shaped ring is inlaid with high-purity graphite pillars, forming a self-lubricating body, which reduces wear, increases tensile strength, and reduces the risk of strain fracture. 3. Honeycomb-shaped crimp tubes and terminals: ① Enhanced compressive strength and stability: Enables the dropper wire to remain stable even under frequent vibration and high-speed impact.

[0025] ② Material utilization and lightweighting: The amount of material used is reduced, while the strength is maintained through mechanical dispersion effect, resulting in overall lightweighting of the droppers; ③ Optimized heat dissipation and conductivity: The increased surface area is beneficial for heat dissipation and uniform current distribution, which can reduce the local resistance and temperature rise of the suspension wire and improve the efficiency of power transmission. ④ The end fatigue stress concentration zone is decomposed and evenly distributed; ⑤ The surface coating provides corrosion protection and extends service life; 4. Innovation in crimping technology: ① The double-clamp crimping tube intermittent positive and negative crimping has the same number of canine teeth on each side. With the help of auxiliary lines, the crimping is more rounded and the stress distribution is more uniform. It decomposes the stress concentration in the single tube crimping end area, eliminates internal stress, and reduces fatigue fracture at the end of the dropper crimping tube. ② The fatigue resistance of the overall dropper is enhanced, which greatly improves the service life of the overall dropper, reduces costs, and makes train operation safer.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite high-speed rail dropper resistant to cyclic loads, characterized in that, It includes: The central unit is composed of at least one set of the first composite units; And the peripheral stranding assembly, which includes several sets of second composite units with the same equivalent diameter; The outer periphery of the central unit is provided with several second composite units and composite stranded wires. The first composite unit and the second composite unit are each composed of 7 corresponding equal diameter units forming a 1+6 stranded wire structure. The first composite unit and the second composite unit include at least one set of filament stranding structure. The corresponding filament stranding structure is 7 equal diameter filaments stranded together to form a 1+6 stranded wire structure.

2. The composite high-speed rail dropper wire resistant to cyclic loads according to claim 1, characterized in that: Both the first composite unit and the second composite unit are composed of seven sets of fine filament twisted structures forming a 1+6 twisted wire structure. At this time, the central unit and the outer twisted assembly are both composite units formed by twisting fine filament twisted structures.

3. The composite high-speed rail dropper wire resistant to cyclic loads according to claim 1, characterized in that: When the first composite unit and the second composite unit include at least one thick filament, the diameter of the thick filament is equal to the equivalent diameter of the stranded filament structure.

4. The composite high-speed rail dropper wire resistant to cyclic loads according to claim 1, characterized in that: The first composite unit and the second composite unit include four fine filament twisted structures and three thick filaments. The center of the composite unit is a fine filament twisted structure, and the other three sets of fine filament twisted structures and thick filaments are arranged at staggered intervals on the outer periphery of the fine filament twisted structure at the center position, twisting together to form a 1+6 twisted wire structure.

5. A high-speed rail dropper wire crimping system, characterized in that, It includes: Two sets of heart-shaped rings; Several sets of clamped tubes, each set of clamped tubes includes two annular ends and a central annular honeycomb body, wherein the two ends of the central annular honeycomb body are respectively provided with annular ends; The dropper wire is a composite high-speed rail dropper wire resistant to cyclic loads as described in any one of claims 1-4; And two sets of crimp terminals, including crimp ends and inlet ends; The upper end of the drop wire wraps around the upper heart-shaped ring in the longitudinal direction to form an upper crimping section and extends outward to be inserted into the crimping end of the upper crimping terminal. The lower end of the drop wire wraps around the lower heart-shaped ring in the longitudinal direction to form a lower crimping section and extends outward to be inserted into the crimping end of the lower crimping terminal. The upper crimping section includes two overlapping sections of partial drop wires, which are crimped together by two sets of spaced-apart crimping tubes. The lower crimping section includes two overlapping sections of partial drop wires, which are crimped together by two sets of spaced-apart crimping tubes. The crimping position of the crimping tubes is concentrated in the central annular honeycomb structure.

6. A high-speed rail dropper crimping system according to claim 5, characterized in that... It also includes two auxiliary lines, which are cut sections of the same diameter dropper wire. Each auxiliary line is located in the corresponding length region of the upper crimping section and the lower crimping section. The two local dropper wires and the auxiliary lines are all located in the inner cavity of the corresponding crimping tube. The two sets of crimping tubes are spaced apart and press together the outer periphery of the three dropper wires that enclose an equivalent circle.

7. A high-speed rail dropper crimping system according to claim 5, characterized in that: The outer circumferential groove of the heart ring is used to embed the dropper wire. The heart ring includes a sealing surface, which is located at the outer circumferential closed position of the heart ring for connecting the catenary dropper wire clamp or the contact wire dropper wire clamp. The inner edge of the heart ring corresponding to the sealing surface is embedded with several graphite pillars. The graphite pillars contact the catenary dropper wire clamp or the contact wire dropper wire clamp to form a self-lubricating body, which reduces wear, increases tensile strength, and reduces the risk of strain fracture of the heart ring.

8. A high-speed rail dropper crimping system according to claim 5, characterized in that: The crimping end of the crimping terminal is an annular honeycomb structure.

9. A high-speed rail dropper crimping system according to claim 5, characterized in that: When two sets of clamped tubes are crimped, the two sets of clamped tubes are intermittently crimped in opposite directions, with the same number of canine teeth on each side. With the help of auxiliary lines, the crimping is made more round and the stress distribution is more uniform, thereby decomposing the stress concentration in the crimping end area of ​​a single tube, eliminating internal stress, and reducing fatigue fracture at the end of the dropper clamped tube.

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