Additional lead fatigue test device
By using a multi-source large displacement excitation test device and adjusting the tension with a linear motor and pulley system, the problem of existing devices being unable to accurately simulate aerodynamic loads is solved. This achieves high-precision, multi-source excitation simulation of additional conductors, improving the accuracy and flexibility of the test.
Patent Information
- Application Number
- CN202422837234.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-11-20
AI Technical Summary
The existing fatigue testing equipment for additional conductors of electrified railway catenary cannot accurately simulate the complex load spectrum caused by aerodynamic forces, and cannot flexibly adjust the initial tension and amplitude, resulting in inaccurate test results.
The test device employs multi-source large displacement excitation, including a support column, an additional conductor tension loading assembly, a suspension assembly, an end anchoring assembly, and a fatigue vibration load loading assembly. A linear motor is used to provide high-speed, high-precision large-amplitude excitation, and the tension is adjusted by pulley blocks and counterweight strings to simulate vibration under aerodynamic conditions.
It achieves high-precision, multi-source complex excitation simulation of additional conductors, and can flexibly adjust the tension, improving the accuracy and reliability of the test and effectively evaluating the fatigue resistance of the additional conductors.
Smart Images
Figure CN223597438U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the electrification railway contact network technical field, concretely relates to a kind of additional conductor fatigue test device for electrification railway contact network additional conductor. BACKGROUND
[0002] High-speed railway contact network is erected along the overhead line and the special power supply line without backup, which transmits electric energy to motor train unit through reliable and stable contact with high-speed running on-board pantograph, and is the key system to ensure the safe, high-speed and punctual operation of train. The contact network additional conductor is an important part of the contact network system, which is overhead conductor except contact suspension, including power supply line, positive feed line, protection line, return line, overhead ground wire and lightning conductor, most of which are suspended above the railway line. The additional conductor system is generally erected in overhead mode, and the working environment is poor. In actual operation process, in addition to being affected by environmental wind load, it is also subjected to the aerodynamic force generated by high-speed train for a long time. With the rapid development of high-speed railway in China and the speed-up of existing line trains, the influence of train aerodynamic force on contact network additional conductor has attracted more and more attention. The primary cause of fatigue of additional conductor and its parts is vibration. When the train runs at high speed, the air near the side, bottom and tail of the train moves, forming a non-steady, viscous turbulent field, which in turn produces complex forces on the surrounding facilities. Each train passing will cause a series of vibrations of contact network parts, and long-term vibration will cause cumulative damage to high-speed contact network additional conductor parts. When the cumulative damage reaches a certain degree, metal fatigue fracture will occur, leading to part failure and further causing contact network failure.
[0003] In power system, there are many kinds of overhead conductor galloping test platforms. Most of them are scaled down by actual single span conductor, iron tower is simulated by column, conductor is erected between iron towers, and test is carried out by loading instantaneous excitation on test point of conductor to make conductor vibrate. The instantaneous excitation is mostly single-point loading, which cannot simulate the complex load spectrum caused by aerodynamic force, so it cannot accurately test and analyze the additional conductor. The initial tension of traditional test device for additional conductor is a fixed value, which is not convenient to adjust. In addition, the amplitude provided by the existing test device is small, generally tens of millimeters. SUMMARY
[0004] The utility model provides a kind of test device based on multi-source large displacement excitation, which can well simulate the vibration of additional conductor under the influence of aerodynamic force and the fatigue resistance of wire and suspension parts.
[0005] The utility model solves its technical problem by adopting the following technical scheme:
[0006] An additional conductor fatigue test device, comprising a plurality of support columns, an additional conductor, an additional conductor tension loading assembly, an additional conductor suspension assembly, a terminal anchoring assembly, a fatigue vibration load loading assembly;
[0007] The support columns are sequentially fixed to the ground, the first terminal support column at the left end is provided with the additional conductor tension loading assembly, and the second terminal support column at the right end is provided with the terminal anchoring assembly; the second support column on the left side and the second support column on the right side are both provided with the additional conductor suspension assembly, the additional conductor suspension assembly is provided with the additional conductor fixing device, and the fatigue vibration load loading assembly is arranged on the middle support columns;
[0008] One end of the additional conductor is connected with the additional conductor tension loading assembly, the other end is connected with the terminal anchoring assembly, and the additional conductor is connected with the additional conductor fixing device and the fatigue vibration load loading assembly.
[0009] Further, the additional conductor tension loading assembly comprises a pulley block and a counterweight string, the left end of the pulley block is connected with the first terminal support column, the right end is connected with the additional conductor, and the lower side of the pulley block is connected with the counterweight string.
[0010] Further, the pulley block comprises a fixed pulley frame, a movable pulley frame, a first fixed pulley, a second fixed pulley, a first movable pulley, a second movable pulley and a pulley rope; one end of the pulley rope is fixedly connected with one end of the fixed pulley frame, and sequentially passes through the first movable pulley, the second fixed pulley, the second movable pulley and the first fixed pulley, and the other end is connected with the counterweight string; the transmission ratio of the pulley block is 1:4.
[0011] Further, the fatigue vibration load loading assembly comprises a driving device, the driving device comprises a linear motor; the linear motor is installed on the side of the support column; the additional conductor clamp is installed on the output end of the linear motor, and the additional conductor clamp clamps the additional conductor.
[0012] Further, the additional conductor suspension assembly is a cantilever structure and is offset to one side.
[0013] Further, the terminal anchoring assembly comprises a wire clamp and a base; the wire clamp is connected to the base; and the base is fixed to the second terminal support column.
[0014] Further, the counterweight string comprises a pull rod and a plurality of counterweight blocks, the counterweight blocks are circular structures, a circular hole is arranged in the middle, and a through groove is arranged between the circular hole and the outer edge.
[0015] Further, the test device comprises at least three support columns each provided with a fatigue vibration load loading assembly, thereby forming a multi-source oscillation excitation.
[0016] Further, the additional conductor tension loading assembly adjusts the tension of the additional conductor by increasing or decreasing the number of counterweight blocks.
[0017] Further, the excitation frequency of the fatigue vibration load loading assembly is 1Hz-20Hz, and the amplitude is ±500mm.
[0018] The linear motor has the characteristics of no intermediate transmission mechanism, direct conversion of electric energy into linear motion mechanical energy, no intermediate transmission mechanism, simplified whole system, improved precision, reduced vibration and noise. Due to the inertia and resistance moment of the intermediate transmission mechanism, the linear motor has short acceleration and deceleration time, can realize rapid starting and reverse operation, and the linear motor is not affected by centrifugal force, so that the linear speed is not limited and can reach a very high speed.
[0019] The advantages and positive effects of the utility model are:
[0020] The driving device of the fatigue vibration load loading assembly is a linear motor, which can provide high-speed, high-precision and large-amplitude excitation. BRIEF DESCRIPTION OF DRAWINGS
[0021] The technical solutions of the utility model will be further described in detail below in combination with the drawings and embodiments, but it should be known that these drawings are only designed for explanation purposes, and therefore cannot be regarded as the limitation of the scope of the utility model. In addition, unless specifically indicated, these drawings are only intended to conceptually illustrate the structural configuration described herein, and do not necessarily be drawn in proportion.
[0022] Figure 1 It is the installation structure schematic view of the utility model;
[0023] Figure 2 It is the additional wire tension loading assembly structure schematic view of the utility model;
[0024] Figure 3 It is the counterweight block structure schematic view of the utility model;
[0025] Figure 4 It is the end anchoring assembly structure schematic view of the utility model;
[0026] Figure 5 It is the additional wire suspension assembly structure schematic view of the utility model;
[0027] Figure 6 It is the fatigue vibration load loading assembly structure schematic view of the utility model. DETAILED DESCRIPTION
[0028] First, it should be noted that the specific structure, features, and advantages of this utility model will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the utility model in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of this utility model that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.
[0029] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0031] This embodiment provides an additional conductor fatigue testing device, including a support column, an additional conductor 2, an additional conductor suspension assembly 6, an additional conductor tension loading assembly 5, an end anchoring assembly 7, and a fatigue vibration load loading assembly 8.
[0032] like Figure 1 As shown, the test setup includes at least seven supports, all fixed to the ground. The first end support 1a at the left end is fitted with an additional conductor tension loading assembly 5, and the second end support 1b at the right end is fitted with an end anchoring assembly 7. The second end support 3a on the left and the second end support 3b on the right are fitted with additional conductor suspension assemblies 6, on which the additional conductor to be tested is fixed. The middle support is fitted with a fatigue vibration load loading assembly 8. The supports are spaced 10 meters apart, with the end supports being 2 meters high and the middle support being 3 meters high.
[0033] like Figure 1 As shown, the additional conductor tension loading assembly 5 is installed on the upper right part of the first end support 1a; the end anchoring assembly 7 is installed on the upper left part of the second end support 1b; the additional conductor suspension assembly 6 is installed on the top of the suspension support 3; and the fatigue vibration load loading assembly 8 is installed on the three middle supports. Figure 1 The middle part of numbers 4a, 4b, and 4c.
[0034] As Figure 2 shown, the additional wire tension loading assembly 5 includes a pulley block 51 and a weight string 52. The upper left end of the pulley block is connected to the first end support column 1a, the right end is connected to the additional wire 2, and the lower left end is connected to the weight string 52. The pulley block 51 includes a fixed pulley frame 511, a movable pulley frame 512, a first fixed pulley 513, a second fixed pulley 514, a first movable pulley 515, a second movable pulley 516, and a pulley rope 517. One end of the pulley rope 517 is fixedly connected to one end of the fixed pulley frame 511, and in turn passes through the first movable pulley 515, the second fixed pulley 514, the second movable pulley 516, and the first fixed pulley 513, and is connected to the weight string at the end. The transmission ratio of the pulley block 51 is 1:4. The additional wire tension loading assembly 5 can increase or decrease the number of weight blocks 522 to adjust the tension of the additional wire. Each weight block weighs 25 kg, and there are 12 in total, totaling 300 kg, which is provided to the additional wire by the pulley block with a transmission ratio of 1:4, providing a tension of 12 kN to the additional wire.
[0035] As Figure 3 shown, the weight string 52 includes a pull rod 521 and a plurality of weight blocks 522; the diameter of the pull rod 521 is φ16 mm; the weight block 522 is a circular structure 5221 with a diameter of 360 mm and a thickness of 35 mm, a circular hole 5222 is provided in the middle, and a through groove 5223 is provided between the circular hole and the outer edge, the weight block 522 is arranged in order by passing through the through groove 5223 into the pull rod 521.
[0036] As Figure 5 shown, the additional wire suspension assembly 6 is installed at the top of the left second support column 3a and the right second support column 3b, and is a cantilever structure that is offset to one side.
[0037] As Figure 4 shown, the end anchoring assembly 7 includes a wire clamp 701 and a base 702; the wire clamp 701 is connected to the base 702; the base is fixed to the second end support column 1b.
[0038] As Figure 6 shown, the fatigue vibration load loading assembly 8 includes a driving device, which is a linear motor 801; the linear motor 801 is installed on the side of the support column; the linear motor output end 802 is installed with an additional wire clamp 803, which clamps the additional wire 2; three sets of fatigue vibration load loading assemblies 8 are provided in this embodiment, the excitation frequency of the fatigue vibration load loading assembly 8 is 1 Hz to 20 Hz, and the amplitude is ±500 mm; of course, three or more sets of fatigue vibration load loading assemblies 8 can also be considered to form a multi-source oscillation excitation.
[0039] The driving device of the fatigue vibration load loading assembly is a linear motor, can provide high-speed, high-precision, large-amplitude excitation, three or more loading assemblies are adopted, and multiple source complex excitation can be realized; the gravity type loading scheme of the pulley set and the counterweight string can realize the function of flexibly and conveniently adjusting the additional conductor tension.
[0040] The utility model discloses a plurality of fatigue vibration load loading assemblies provide different vertical displacement and load for additional conductor, simulate the vibration condition of additional conductor when being excited by train aerodynamic force along the direction of additional conductor in actual, be used to study the vibration characteristic of additional conductor and the fatigue resistance of additional conductor fixing device under different tension, different excitation frequency and different excitation amplitude, make up the deficiency of traditional single-end single-source excitation additional conductor, and can conveniently adjust the tension of additional conductor.
[0041] The above embodiment has been described in detail, but the content described can only be the preferred embodiment of the utility model, and cannot be considered to limit the implementation range of the utility model. Any equivalent change and improvement made according to the utility model application range should still belong to the patent coverage range of the utility model.
Claims
1. An additional wire fatigue testing device characterized by: The test device comprises a plurality of pillars, an additional conductor (2), an additional conductor tension loading assembly (5), an additional conductor suspension assembly (6), a terminal anchoring assembly (7), and a fatigue vibration load loading assembly (8). The pillars are fixed to the ground in sequence, a first terminal pillar (1a) at the left end is provided with the additional conductor tension loading assembly (5), and a second terminal pillar (1b) at the right end is provided with the terminal anchoring assembly (7); the second pillar (3a) at the left side and the second pillar (3b) at the right side are both provided with the additional conductor suspension assembly (6), the additional conductor suspension assembly (6) is provided with an additional conductor fixing device, and the pillars in the middle are all provided with the fatigue vibration load loading assembly (8). One end of the additional conductor (2) is connected to the additional conductor tension loading assembly (5), the other end is connected to the terminal anchoring assembly (7), and the additional conductor (2) is connected to the additional conductor fixing device and the fatigue vibration load loading assembly (8) respectively.
2. The apparatus of claim 1, wherein: The additional conductor tension loading assembly (5) comprises a pulley block (51) and a weight string (52), the left end of the pulley block is connected to the first terminal pillar (1a), the right end is connected to the additional conductor (2), and the lower part of the pulley block is connected to the weight string (52).
3. An apparatus for additional wire fatigue testing as defined in claim 2, wherein: The pulley block (51) comprises a fixed pulley frame (511), a movable pulley frame (512), a first fixed pulley (513), a second fixed pulley (514), a first movable pulley (515), a second movable pulley (516), and a pulley rope (517); one end of the pulley rope is fixedly connected to one end of the fixed pulley frame, and sequentially passes through the first movable pulley, the second fixed pulley, the second movable pulley, and the first fixed pulley, and the other end is connected to the weight string.
4. The apparatus of claim 1, wherein: The fatigue vibration load loading assembly (8) comprises a driving device, the driving device comprises a linear motor (801); the linear motor (801) is installed on the side of the pillar; the linear motor output end (802) is provided with an additional conductor clamp (803), and the additional conductor clamp (803) clamps the additional conductor (2).
5. The apparatus of claim 1, wherein: The additional conductor suspension assembly (6) is a cantilever structure and deviates to one side.
6. The apparatus of claim 1, wherein: The terminal anchoring assembly (7) comprises a wire clamp (701) and a base (702); the wire clamp (701) is connected to the base (702); and the base is fixed to the second terminal pillar (1b).
7. The apparatus of claim 2, wherein: The weight string (52) comprises a pull rod (521) and a plurality of weight blocks (522), the weight block (522) is a circular structure (5221), a circular hole (5222) is arranged in the middle, and a through groove (5223) is arranged between the circular hole and the outer edge.
8. The apparatus of claim 1, wherein: The test device comprises at least three pillars each provided with a fatigue vibration load loading assembly (8), forming a multi-source oscillation excitation.
9. The apparatus of claim 2, wherein: The additional conductor tension loading assembly (5) adjusts the tension of the additional conductor by increasing or decreasing the number of weight blocks (522).
10. The apparatus of claim 1, wherein: The excitation frequency of the fatigue vibration load loading assembly (8) is 1 Hz to 20 Hz, and the amplitude is ±500 mm.