Copper-magnesium alloy contact wire with improved tensile strength and material utilization

Abstract

The utility model provides a kind of copper magnesium alloy contact wire of improving tensile strength and material utilization, belong to electrification railway and urban rail transit technical field, comprising: clamping portion, it is located contact line top position and overall section is fan-shaped structure, for with catenary wire clamp cooperation;Connecting portion, it is located clamping portion below and overall section is isosceles trapezoidal structure, connecting portion both sides and the both sides between clamping portion are formed with groove;Supporting portion, it is located contact line bottom position and is connected in clamping portion below, supporting portion and pantograph sliding cooperation;Clamping portion cross-sectional area accounts for 20%-33% of contact line cross-sectional area, supporting portion cross-sectional area accounts for 55%-60% of contact line cross-sectional area, the utility model can be by increasing the cross-sectional area ratio of supporting portion so that the wear resistance effect of contact line is better, simultaneously can by adjusting the size and angle of each clamping portion, connecting portion and supporting portion make contact line can be normally used while reducing the material consumption of the production of contact line.

Description

Technical Field

[0001] This utility model relates to the field of electrified railway and urban rail transit technology, specifically to a copper-magnesium alloy contact wire that improves tensile strength and material utilization. Background Technology

[0002] In the fields of electrified railways and urban rail transit, the contact wire is a key component for power transmission, and its performance directly affects the safety and stability of train operation. Currently, conventional copper and copper alloy contact wires generally adopt a gourd-shaped cross-section design with clamping grooves. This design faces the challenge of insufficient tensile strength in high-speed electrified railways (speeds of 400-450 km / h), and also suffers from low material utilization and high production costs.

[0003] According to the railway industry standard TB / T2809-2017 "Copper and Copper Alloy Contact Wires for Electrified Railways", the local wear of contact wires used in high-speed electrified railway contact networks must be controlled within 20%, while the wear area of ​​rigid contact networks for urban rail transit must not exceed 35%.

[0004] However, the gourd-shaped cross-section contains redundant material in the middle and upper regions, resulting in an overly large overall cross-sectional area and significant material waste. For example, the actual working area at the bottom of the original contact wire accounts for only 53.93%, while the upper clamping area accounts for 20.01%, indicating room for optimization. Utility Model Content

[0005] In view of this, the present invention provides a copper-magnesium alloy contact wire that improves tensile strength and material utilization. The present invention can improve the wear resistance of the contact wire by increasing the cross-sectional area ratio of the support part. At the same time, it can reduce the material consumption in the production of the contact wire while ensuring normal use by adjusting the various dimensions and angles of the clamping part, connecting part and support part.

[0006] To solve the above-mentioned technical problems, this utility model provides a copper-magnesium alloy contact wire that improves tensile strength and material utilization. It includes a clamping part located at the top of the contact wire and having an overall fan-shaped cross-section. The center point of the arc edge of the clamping part is located in the middle of the contact wire and is used to cooperate with the dropper wire clamp.

[0007] The connecting part is located below the clamping part and has an overall cross-sectional shape of an isosceles trapezoid. The smaller end of the connecting part is located near the clamping part. Grooves are formed between the two sides of the connecting part and the two sides of the clamping part. The connecting part and the clamping part are located on the same center line.

[0008] The support part is located at the bottom of the contact line and connected to the clamping part below. The support part is also located on the same center line as the connecting part. The cross-section of the support part is fan-shaped, and the fan-shaped structure has a straight segment that is connected to the bottom of the connecting part. The support part slides with the pantograph.

[0009] The clamping part accounts for 20%-33% of the contact wire's cross-sectional area, while the supporting part accounts for 55%-60%. Increasing the proportion of the supporting part's cross-sectional area improves the wear resistance of the contact wire.

[0010] The total height of the contact wire is 14.5mm-15mm, of which the height of the support part is 3.5mm-4mm and the height of the support part is 7.4mm-7.8mm.

[0011] The distance between the two ends of the arc edge on the clamping part is 7.53mm-9.77mm.

[0012] The width of the bottom plane of the clamping part is 5.3mm-7.17mm.

[0013] The angle between the outer surfaces of both sides of the clamping part and the horizontal plane at the bottom of the clamping part is 54°-59°.

[0014] The angle between the outer surfaces of the two sides of the connector and the top horizontal plane of the connector is 30°-35°.

[0015] The corner of the trench is R0.4×6mm.

[0016] The diameter of the support part is 14.8mm-15.5mm. The top of the clamping part has multiple identification grooves with a radius of 0.25mm-0.4mm.

[0017] The bottom of the support has a downwardly extending structure that connects to the top surface of the support. The cross-section of the support is semi-circular.

[0018] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. Improve tensile strength to meet the requirements of high-speed operation: To address the stringent tensile strength requirements of contact wires in high-speed electrified railways (400–450 km / h), this invention significantly enhances the overall mechanical properties of the contact wire by optimizing the structural proportions of the clamping, connecting, and supporting parts. Experimental data shows that the optimized contact wire maintains conductivity while increasing tensile strength by more than 12%, fully meeting the safety and stability requirements under high-speed operating conditions.

[0019] 2. Optimize material allocation and improve utilization rate: Breaking through the design limitations of traditional gourd-shaped cross-sections with redundant materials in the middle and upper parts, this utility model increases the cross-sectional area ratio of the support part to 55%-60%, while reducing the redundant area of ​​the clamping part. Taking Example 3 as an example, the optimized material utilization rate is increased by 2.14%. Under the premise of ensuring the electromechanical performance of the contact wire, approximately 2.1 kg of copper-magnesium alloy material can be saved per kilometer of contact wire, significantly reducing production costs and resource consumption.

[0020] 3. Enhances wear resistance and extends service life: By increasing the cross-sectional area of ​​the support section (actual working surface) to 59.14% and optimizing its fan-shaped structure and straight section design, this invention increases the contact area between the contact wire and the pantograph by more than 10%, resulting in a more uniform distribution. This effectively disperses sliding friction pressure, reduces local wear rates, and extends the wear life of the contact wire in high-speed sliding scenarios by more than 30%, thereby reducing maintenance frequency and replacement costs. Attached Figure Description

[0021] Figure 1 This is a comparative structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is a structural schematic diagram of Embodiment 3 of the present invention; Figure 5 This is a structural diagram summarizing the data comparison of this utility model; Figure 6 This is a structural diagram for the data comparison summary of this utility model.

[0022] Explanation of reference numerals in the attached figures: 1. Clamping part; 2. Connecting part; 3. Supporting part; 4. Identification groove. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-6 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0024] Comparative example: Contact wires in existing technologies, such as Figure 1As shown: It includes a clamping part 1, which is located at the top of the contact line and has an overall cross-section in the shape of a fan. The center point of the arc edge of the clamping part 1 is located in the middle of the contact line and is used to cooperate with the dropper wire clamp.

[0025] The connecting part 2 is located below the clamping part 1 and has an overall cross-section of an isosceles trapezoid. The smaller end of the connecting part 2 is located near the clamping part 1. Grooves are formed between the two sides of the connecting part 2 and the two sides of the clamping part 1.

[0026] The support part 3 is located at the bottom of the contact line and connected to the clamping part 1 below. The cross-section of the support part 3 is semi-circular, and the semi-circular structure has a straight segment that is connected to the bottom of the connecting part 2. The support part 3 is in sliding fit with the pantograph.

[0027] The clamping part 1 is also provided with three identification slots 4 at the top, each of which has a radius of 2.5 mm. Furthermore, the bottom of the trapezoidal structure of the support part 3 has a downwardly extending structure. This extending structure is rectangular and its bottom is connected to the top surface of the support part 3. The length of the extending part is the same as the length of the bottom of the trapezoidal structure of the support part 3, and it is also the same as the diameter of the support part 3. The cross-section of the support part 3 is a semi-circular structure.

[0028] Specifically, the total height of the contact line is 14.4 (±0.14) mm, of which the height of the clamping part 1 is 4 mm, the height of the connecting part 2 is 3.2 mm, and the diameter of the support part 3 is 14.4 (±0.29) mm. Therefore, the width of the end of the connecting part 2 near the support part 3 is also 14.4 (±0.29) mm.

[0029] The distance between the two ends of the arc edge on the clamping part 1 is 9.71 (±0.19) mm, the plane width of the bottom of the clamping part 1 is 7.24 (+0.29; -0.14) mm, and the center of the arc edge of the clamping part 1 is located at the same center as the support part 3. The radius of the clamping part 1 is 7.2 mm, the clamping part 1 is located directly above the center, and the angle between the outer surface of the two sides of the clamping part 1 and the horizontal plane of the bottom of the clamping part 1 is 51 (±1)°. Correspondingly, the top plane width of the trapezoidal structure of the connecting part 2 is 6.8mm, the angle between the outer surface of the two sides of the connecting part 2 and the top horizontal plane of the connecting part 2 is 27 (±1)°, and the two sides of the connecting part 2 and the two sides of the clamping part 1 are connected together by chamfering to form a groove, and the chamfer of the two grooves is R0.4×6mm.

[0030] As shown above, the cross-sectional area of ​​the contact wire is 151 square millimeters, of which the clamping part 1 has a cross-sectional area of ​​32.2186 square millimeters, accounting for 20.01% of the total area; the connecting part 2 has a cross-sectional area of ​​38.6529 square millimeters, accounting for 25.6% of the total area; and the supporting part 3 has a cross-sectional area of ​​81.4301 square millimeters, accounting for 53.93% of the total area. Example 1: The difference from the comparative example is that, for example Figure 2 As shown: the total height of the contact line is 14.8 (±0.14) mm, of which the height of the clamping part 1 is 4 mm, the height of the connecting part 2 is 3.2 mm, and the diameter of the supporting part 3 is 14.4 (±0.29) mm. Therefore, the width of the end of the connecting part 2 near the supporting part 3 is also 14.8 (±0.29) mm.

[0031] Specifically, the distance between the two ends of the arc edge on the clamping part 1 is 9.77 (±0.19) mm, the plane width of the bottom of the clamping part 1 is 7.17 (+0.29; -0.14) mm, and the center of the arc edge of the clamping part 1 is located at the same center as the support part 3. The radius of the clamping part 1 is 7.2 mm, the clamping part 1 is located directly above the center, and the angle between the outer surfaces of the two sides of the clamping part 1 and the horizontal plane of the bottom of the clamping part 1 is 54 (±1)°. Correspondingly, the top plane width of the trapezoidal structure of the connecting part 2 is 6.8mm, the angle between the outer surface of the two sides of the connecting part 2 and the top horizontal plane of the connecting part 2 is 30 (±1)°, and the two sides of the connecting part 2 and the two sides of the clamping part 1 are connected together by chamfering to form a groove, and the chamfer of the two grooves is R0.4×6mm.

[0032] As can be seen from the above, the cross-sectional area of ​​the contact wire is 156.179 square millimeters, of which the cross-sectional area of ​​clamping part 1 is 32.0504 square millimeters, accounting for 20.52% of the total area; the cross-sectional area of ​​connecting part 2 is 38.1118 square millimeters, accounting for 24.4% of the total area; and the cross-sectional area of ​​supporting part 3 is 86.0168 square millimeters, accounting for 55.08% of the total area.

[0033] Compared with the prior art of the comparative example, the cross-sectional proportion of the clamping part 1 and the connecting part 2 is reduced, while the cross-sectional proportion of the supporting part 3 is increased, thereby enabling the clamping part 1 and the connecting part 2 to be used normally while increasing the prominent tensile strength of the supporting part 3.

[0034] Example 2: The difference from the comparative example is that, for example Figure 3As shown: the total height of the contact line is 15 (±0.14) mm, of which the height of the clamping part 1 is 4 mm, the height of the connecting part 2 is 3.2 mm, and the diameter of the support part 3 is 15.2 (±0.29) mm. Therefore, the width of the end of the connecting part 2 near the support part 3 is also 15.2 (±0.29) mm.

[0035] Specifically, the distance between the two ends of the arc edge on the clamping part 1 is 7.53 (±0.19) mm, the plane width of the bottom of the clamping part 1 is 5.3 (+0.29; -0.14) mm, and the center of the arc edge of the clamping part 1 is located at the same center as the support part 3. The radius of the clamping part 1 is 7.2 mm, the clamping part 1 is located directly above the center, and the angle between the outer surfaces of the two sides of the clamping part 1 and the horizontal plane of the bottom of the clamping part 1 is 59 (±1)°. Correspondingly, the top plane width of the trapezoidal structure of the connecting part 2 is 5mm, the angle between the outer surface of the two sides of the connecting part 2 and the top horizontal plane of the connecting part 2 is 33 (±1)°, and the two sides of the connecting part 2 and the two sides of the clamping part 1 are connected together by chamfering to form a groove, and the chamfer of the two grooves is R0.4×6mm.

[0036] As shown above, the cross-sectional area of ​​the contact wire is 154.867 square millimeters, of which the clamping part 1 has a cross-sectional area of ​​20.2283 square millimeters, accounting for 13.6% of the total area; the connecting part 2 has a cross-sectional area of ​​43.91 square millimeters, accounting for 28.35% of the total area; and the supporting part 3 has a cross-sectional area of ​​90.7292 square millimeters, accounting for 58.59% of the total area.

[0037] Compared with the prior art of the comparative example, the cross-sectional area ratio of the clamping part 1 is reduced in most cases, the cross-sectional area ratio of the connecting part 2 is increased in a small part, and the cross-sectional area ratio of the support part 3 is increased in most cases. This allows the clamping part 1 and the connecting part 2 to be used normally while increasing the tensile strength of the support part 3.

[0038] Example 3: The difference from the comparative example is that, for example Figure 4 As shown: the extension on the connecting part 2 is reduced, and the supporting part 3 is a fan-shaped structure with a straight line segment. The fan-shaped structure is not a semicircle, and the center of the fan-shaped structure is located directly above the straight line segment. The radius of the clamping part 1 is reduced, and the center of the adjusted clamping part 1 is located 0.7 mm directly above the center of the fan-shaped structure. At the same time, the radius of the identification groove 4 on the clamping part 1 is 0.4 mm.

[0039] Specifically, the total height of the contact line is 14.5 (±0.13) mm, of which the height of the clamping part 1 is 3.5 mm, the height of the connecting part 2 is 3.2 mm, the radius of the supporting part 3 is 7.8 mm, and the length of the straight section of the supporting part 3 is 15.5 (±0.32) mm. Therefore, the width of the end of the connecting part 2 near the supporting part 3 is also 15.5 (±0.32) mm.

[0040] Specifically, the distance between the two ends of the arc edge on the clamping part 1 is 8.5 (+0.18; -0.05) mm, the plane width of the bottom of the clamping part 1 is 5.7 (+0.15; -0.05) mm, and the center of the arc edge of the clamping part 1 is located at the same center as the support part 3. The radius of the clamping part 1 is 6 mm, the clamping part 1 is located directly above the center, and the angle between the outer surfaces of the two sides of the clamping part 1 and the horizontal plane of the bottom of the clamping part 1 is 50 (±1)°. Correspondingly, the top plane width of the trapezoidal structure of the connecting part 2 is 5.32mm, the angle between the outer surface of the two sides of the connecting part 2 and the top horizontal plane of the connecting part 2 is 35 (±1)°, and the two sides of the connecting part 2 and the two sides of the clamping part 1 are connected together by chamfering to form a groove, and the chamfer of the two grooves is R0.4×6mm.

[0041] As shown above, the cross-sectional area of ​​the contact wire is 147.7638 square millimeters, of which the clamping part 1 has a cross-sectional area of ​​20.7523 square millimeters, accounting for 14.04% of the total area; the connecting part 2 has a cross-sectional area of ​​39.6178 square millimeters, accounting for 26.81% of the total area; and the supporting part 3 has a cross-sectional area of ​​87.3937 square millimeters, accounting for 59.14% of the total area.

[0042] Compared with the existing technology of the comparative example, the cross-sectional area ratio of the clamping part 1 is reduced in most cases, the cross-sectional area ratio of the connecting part 2 is increased in a small part, and the cross-sectional area ratio of the support part 3 is increased in most cases. This allows the clamping part 1 and the connecting part 2 to be used normally while increasing the tensile strength of the support part 3. It also reduces the cross-sectional area of ​​the contact wire, saves material consumption in the production of the contact wire, and achieves the purpose of cost reduction and efficiency improvement.

[0043] In summary, such as Figure 5 , 6 As shown: Example 1: The proportion of the support part 3 is increased to 55.08%, which is 1.15 percentage points higher than the prior art of the comparative example.

[0044] Example 2: The support part 3 accounts for 58.59%, which is 4.66 percentage points higher than the prior art of the comparative example.

[0045] Example 3: The support part 3 accounts for as much as 59.14%, which is 5.21 percentage points higher than the prior art of the comparative example. Moreover, through the fan-shaped structure and straight segment design, the actual working surface contact area is increased by 12% and the distribution is more uniform.

[0046] Conclusion: The support part 3 in Example 3 has the largest increase in proportion and the best effect. In addition, the material consumption of Example 3 is reduced by 2.14% compared with the prior art, and about 2.5 kg of copper-magnesium alloy material is saved per kilometer of contact line. Based on the copper price, the cost per kilometer is reduced by about 215 yuan.

[0047] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A copper-magnesium alloy contact wire with improved tensile strength and material utilization, comprising: The clamping part (1) is located at the top of the contact line and has a fan-shaped cross-section. The center point of the arc edge of the clamping part (1) is located in the middle of the contact line and is used to cooperate with the dropper wire clamp. The connecting part (2) is located below the clamping part (1) and has an overall cross-section of an isosceles trapezoid. The smaller end of the connecting part (2) is located near the clamping part (1). Grooves are formed between the two sides of the connecting part (2) and the two sides of the clamping part (1). The support part (3) is located at the bottom of the contact line and connected to the clamping part (1). The support part (3) has a fan-shaped cross-section with a straight segment connected to the bottom of the connecting part (2). The support part (3) is in sliding fit with the pantograph. The characteristic is that the cross-sectional area of ​​the clamping part (1) accounts for 20%-33% of the cross-sectional area of ​​the contact wire, and the cross-sectional area of ​​the supporting part (3) accounts for 55%-60% of the cross-sectional area of ​​the contact wire. By increasing the cross-sectional area ratio of the supporting part (3), the wear resistance of the contact wire is better.

2. The copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in claim 1, characterized in that, The total height of the contact line is 14.5mm-15mm, of which the height of the support part (3) is 3.5mm-4mm and the height of the support part (3) is 7.4mm-7.8mm.

3. The copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in claim 2, characterized in that, The distance between the two ends of the arc edge on the clamping part (1) is 7.53mm-9.77mm.

4. The copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in claim 1, characterized in that, The bottom plane width of the clamping part (1) is 5.3mm-7.17mm.

5. The copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in claim 4, characterized in that, The angle between the outer surfaces of both sides of the clamping part (1) and the bottom horizontal plane of the clamping part (1) is 54°-59°.

6. The copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in claim 5, characterized in that, The angle between the outer surfaces of the two sides of the connecting part (2) and the top horizontal plane of the connecting part (2) is 30°-35°.

7. The copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in claim 5, characterized in that, The corner of the groove has a radius of 0.4 × 6 mm.

8. The copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in claim 5, characterized in that, The diameter of the support part (3) is 14.8mm-15.5mm.

9. A copper-magnesium alloy contact wire for improving tensile strength and material utilization as described in claim 5, characterized in that, The top of the clamping part (1) has a plurality of identification grooves (4), the radius of which is 0.25mm-0.4mm.

10. A copper-magnesium alloy contact wire with improved tensile strength and material utilization as described in any one of claims 1-5, characterized in that, The bottom of the trapezoidal structure of the support part (3) has a downward extending structure, the bottom of which is connected to the top surface of the support part (3), and the cross-section of the support part (3) is a semi-circular structure.

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