Fatigue test method for additional lead of overhead line system of high-speed railway

Abstract

The invention discloses a fatigue test method for an additional lead of a high-speed railway overhead line system. The method comprises a vibration test and a fatigue test. The vibration test is carried out in a high-speed railway overhead line system part vibration test field, a tested part is installed on the vibration field, the tension and test frequency of an overhead line system are adjusted, and the vibration test is started at the maximum frequency at which the overhead line system does not resonate within the range of 1Hz-3Hz; the fatigue test is carried out in a contact network part fatigue test system, installation is carried out according to the actual use state, the fastening torque of a connecting bolt meets the standard and design pattern requirements, and test parameters are set according to a specific test piece until the output waveform reaches the input requirement; the state of the part is checked regularly in the vibration test and fatigue test process, and the test is stopped when the phenomena of fracture, damage and loosening are found; the fatigue test process is allowed to be interrupted, and fatigue times are accumulated according to actually recorded fatigue times; the fatigue test of the lead can be realized, and the use safety of the product is improved.

Description

Technical Field

[0001] The invention belongs to the field of testing methods, and in particular relates to a fatigue testing method for additional conductors of a high-speed railway contact network. Background Art

[0002] The overhead contact network of high-speed railways is an important infrastructure to ensure the normal operation of trains, and its additional conductors are an important part of the overhead contact network. Under the condition of high-speed train operation, the additional conductors are repeatedly affected by the dynamic effects of the train and environmental loads for a long time, and are prone to fatigue damage, which in turn affects the reliability and service life of the overhead contact network. At present, there are few experimental studies on the fatigue performance of additional conductors of the overhead contact network. Both at home and abroad, a complete, systematic and scientific fatigue test method for rope-type multi-strand stranded wire structures has not yet been developed to simulate the fatigue conditions under actual operating conditions, making it difficult to accurately evaluate the fatigue performance of the conductors and formulate corresponding optimization design plans.

[0003] Therefore, developing a scientific and effective fatigue test method is of great significance to improving the operational reliability and safety of high-speed railway contact networks. Summary of the invention

[0004] The present invention adopts the following technical solutions:

[0005] A fatigue test method for an additional conductor of a high-speed railway contact network, the method comprising a vibration test and a fatigue test;

[0006] in,

[0007] The vibration test is carried out in a vibration test field for high-speed railway contact network parts. The tested parts are installed on the vibration field, the contact network tension and the test frequency are adjusted, and the vibration test is started at the maximum frequency within the range of 1 Hz to 3 Hz at which the contact network does not resonate. During the vibration test, the status of the parts is checked regularly, and the test is stopped when fracture, damage or looseness is found. Interruptions are allowed during the test process, and the number of vibrations is accumulated according to the actual recorded number of vibrations.

[0008] The fatigue test is carried out in a contact network component fatigue test system, which is installed according to the actual use status. The tightening torque of the connecting bolts meets the standards and design drawings. The test parameters are set according to the specific test piece, and the output waveform is based on the input requirements. During the fatigue test, the status of the parts is checked regularly, and the test is stopped if any breakage, damage or looseness is found. Interruptions are allowed during the fatigue test process, and the number of fatigue times is accumulated according to the actual recorded number of fatigue times.

[0009] Furthermore, the test parameters of the vibration test are as follows:

[0010] Installation conditions: Install according to the working status;

[0011] Test load: maximum working load;

[0012] Waveform: sine wave;

[0013] Vertical amplitude: 35mm when the driving speed is less than or equal to 200km / h; 45mm when the driving speed is greater than 200km / h;

[0014] Frequency: 1Hz~3Hz;

[0015] Number of cycles: ≥2×106 times.

[0016] Furthermore, the parameters of the fatigue test are as follows:

[0017] Installation conditions: Install according to the working status;

[0018] Test load and amplitude: maximum working load ± 30% of maximum working load;

[0019] Waveform: sine wave;

[0020] Frequency: 1Hz~3Hz;

[0021] Cycle number: ≥5×10 5 Second-rate.

[0022] Furthermore, for components that need to undergo vibration and fatigue tests at the same time, the test sequence is to conduct vibration test first, and then fatigue test after passing the test. After the fatigue test, the component destructive load test is carried out according to the requirements of the standards and design drawings.

[0023] Furthermore, the maximum working load of the full tension type pre-twisted splice in vibration and fatigue test loads is:

[0024] QJ1-70, QJ2-63: 7kN;

[0025] QJ1-120, QJ2-125: 10kN;

[0026] QJ1-185, QJ2-200: 13kN;

[0027] QJ1-240, QJ2-250, QJ2-315: 15kN.

[0028] Furthermore, the maximum working load of the non-full tension type pre-twisted splicing strip and the T-type pre-twisted splicing strip in the vibration test load is 10% of the rated breaking force of the spliced ​​wire.

[0029] Furthermore, components should meet the following requirements after vibration and fatigue tests:

[0030] a) Parts should not be damaged, broken, severely deformed, loose or slipping, or have bolts stuck;

[0031] b) The failure load is greater than or equal to 95% of the specified value;

[0032] c) Actual tightening torque test of bolts after vibration test: After the vibration test, in the fastening device of the plate stamping type suspension string clamp, the tightening torque value of the nut that produces the clamping force on the parts should be greater than or equal to 85% of the tightening torque value before the vibration test; in the fastening devices of other parts, the tightening torque value of the nut that produces the clamping force on the parts should be greater than or equal to 90% of the tightening torque value before the vibration test;

[0033] d) According to the installation state of the actual tightening torque of the bolts after the vibration test, the sliding load test is carried out on the components, and the sliding load decreases less than or equal to 5% of the specified value.

[0034] The beneficial technical effects of the present invention are:

[0035] The present invention provides a fatigue test method for additional conductors of high-speed railway overhead wires. By simulating the force and environmental influence of the conductors under actual operating conditions, the fatigue performance of the additional conductors can be accurately evaluated. The test method of the present invention has the following features:

[0036] Beneficial effects:

[0037] Strong authenticity: The test conditions can fully reproduce the actual stress state of the additional conductor under the action of train power, providing reliable fatigue performance data support.

[0038] High efficiency: By optimizing the test process and loading method, the test efficiency is significantly improved and the test cycle is shortened.

[0039] Strong guidance: The test results can provide a scientific basis for contact network design optimization, material selection, and operation and maintenance, thereby improving the overall safety and economy of the contact network.

[0040] Wide applicability: This method is applicable to the fatigue performance research of various types of contact network conductors and has strong versatility and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of a vibration test field in an embodiment of the present invention;

[0042] Figure 2 The vibration test installation and control curve in the embodiment of the present invention;

[0043] Figure 3 A schematic diagram of a fatigue test system in an embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of fatigue test in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following is a further clear and complete description of a method and device for clearing a power capacity market taking into account flexibility provided by the present invention in conjunction with the accompanying drawings:

[0046] A fatigue test method for an additional conductor of a high-speed railway contact network, the method comprising a vibration test and a fatigue test;

[0047] in,

[0048] The vibration test is carried out at the vibration test site of high-speed railway contact network components, such as Figure 1 As shown, the tested parts are installed on the vibration field as required. Typical parts installation is as follows Figure 2 As shown, adjust the contact network tension and test frequency, and start the vibration test at the maximum frequency within the range of 1Hz to 3Hz at which the contact network does not resonate; during the vibration test, check the status of the parts regularly, and stop the test if any breakage, damage or looseness is found; the test process is allowed to be interrupted, and the number of vibrations is accumulated according to the actual recorded number of vibrations;

[0049] Fatigue test in contact network parts fatigue test system ( Figure 3 As shown in the figure, install according to the actual use status. The typical parts installation is as follows Figure 4 The tightening torque of the connecting bolts meets the requirements of the standards and design drawings. The test parameters are set according to the specific test piece, and the output waveform meets the input requirements. During the fatigue test, the status of the parts is checked regularly, and the test is stopped when fracture, damage, or loosening is found. The fatigue test process is allowed to be interrupted, and the fatigue times are accumulated according to the actual recorded fatigue times.

[0050] The test parameters of the vibration test are as follows:

[0051] Installation conditions: Install according to the working status;

[0052] Test load: maximum working load;

[0053] Waveform: sine wave;

[0054] Vertical amplitude: 35mm when the driving speed is less than or equal to 200km / h; 45mm when the driving speed is greater than 200km / h;

[0055] Frequency: 1Hz~3Hz;

[0056] Number of cycles: ≥2×106 times.

[0057] The parameters of the fatigue test are as follows:

[0058] Installation conditions: Install according to the working status;

[0059] Test load and amplitude: maximum working load ± 30% of maximum working load;

[0060] Waveform: sine wave;

[0061] Frequency: 1Hz~3Hz;

[0062] Cycle number: ≥5×10 5 Second-rate.

[0063] For components that need to undergo vibration and fatigue tests at the same time, the test sequence is to perform vibration test first, and then fatigue test after passing the test. After the fatigue test, the component destructive load test is carried out according to the requirements of the standards and design drawings.

[0064] Furthermore, the maximum working load of the full tension type pre-twisted splice in vibration and fatigue test loads is:

[0065] QJ1-70, QJ2-63: 7kN;

[0066] QJ1-120, QJ2-125: 10kN;

[0067] QJ1-185, QJ2-200: 13kN;

[0068] QJ1-240, QJ2-250, QJ2-315: 15kN.

[0069] The maximum working load in the vibration test load of non-full tension pre-twisted splicing strips and T-type pre-twisted splicing strips is 10% of the rated breaking force of the spliced ​​wire.

[0070] Furthermore, components should meet the following requirements after vibration and fatigue tests:

[0071] a) Parts should not be damaged, broken, severely deformed, loose or slipping, or have bolts stuck;

[0072] b) The failure load is greater than or equal to 95% of the specified value;

[0073] c) Actual tightening torque test of bolts after vibration test: After the vibration test, in the fastening device of the plate stamping type suspension string clamp, the tightening torque value of the nut that produces the clamping force on the parts should be greater than or equal to 85% of the tightening torque value before the vibration test; in the fastening devices of other parts, the tightening torque value of the nut that produces the clamping force on the parts should be greater than or equal to 90% of the tightening torque value before the vibration test;

[0074] d) According to the installation state of the actual tightening torque of the bolts after the vibration test, the sliding load test is carried out on the components, and the sliding load decreases less than or equal to 5% of the specified value.

[0075] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A fatigue test method for additional conductors of high-speed railway contact network, characterized in that: The method includes vibration testing and fatigue testing; in, The vibration test is carried out in a vibration test field for high-speed railway contact network parts. The tested parts are installed on the vibration field, the contact network tension and the test frequency are adjusted, and the vibration test is started at the maximum frequency within the range of 1 Hz to 3 Hz at which the contact network does not resonate. During the vibration test, the status of the parts is checked regularly, and the test is stopped when fracture, damage or looseness is found. Interruptions are allowed during the test process, and the number of vibrations is accumulated according to the actual recorded number of vibrations. The fatigue test is carried out in a contact network component fatigue test system, which is installed according to the actual use status. The tightening torque of the connecting bolts meets the standards and design drawings. The test parameters are set according to the specific test piece, and the output waveform is based on the input requirements. During the fatigue test, the status of the parts is checked regularly, and the test is stopped if any breakage, damage or looseness is found. Interruptions are allowed during the fatigue test process, and the number of fatigue times is accumulated according to the actual recorded number of fatigue times.

2. A fatigue test method for additional conductors of a high-speed railway overhead contact network according to claim 1, characterized in that: The test parameters of the vibration test are as follows: Installation conditions: Install according to the working status; Test load: maximum working load; Waveform: sine wave; Vertical amplitude: 35mm when the driving speed is less than or equal to 200km / h; 45mm when the driving speed is greater than 200km / h; Frequency: 1Hz~3Hz; Number of cycles: ≥2×106 times.

3. A fatigue test method for additional conductors of a high-speed railway overhead contact network according to claim 1, characterized in that: The parameters of the fatigue test are as follows: Installation conditions: Install according to the working status; Test load and amplitude: maximum working load ± 30% of maximum working load; Waveform: sine wave; Frequency: 1Hz~3Hz; Cycle number: ≥5×10 5 Second-rate.

4. A fatigue test method for additional conductors of a high-speed railway overhead contact network according to claim 1, characterized in that: For components that need to undergo vibration and fatigue tests at the same time, the test sequence is to perform vibration test first, and then fatigue test after passing the test. After the fatigue test, the component destructive load test is carried out according to the requirements of the standards and design drawings.

5. A fatigue test method for additional conductors of a high-speed railway overhead contact network according to claim 1, characterized in that: Maximum working load of full tension pre-twisted splice in vibration and fatigue test load: QJ1-70, QJ2-63: 7kN; QJ1-120, QJ2-125: 10kN; QJ1-185, QJ2-200: 13kN; QJ1-240, QJ2-250, QJ2-315: 15kN.

6. A fatigue test method for additional conductors of a high-speed railway overhead contact network according to claim 1, characterized in that: The maximum working load in the vibration test load of non-full tension pre-twisted splicing strips and T-type pre-twisted splicing strips is 10% of the rated breaking force of the spliced ​​wire.

7. A fatigue test method for additional conductors of a high-speed railway overhead contact network according to claim 1, characterized in that: After vibration and fatigue tests, components should meet the following requirements: a) Parts should not be damaged, broken, severely deformed, loose or slipping, or have bolts stuck; b) The failure load is greater than or equal to 95% of the specified value; c) Actual tightening torque test of bolts after vibration test: After the vibration test, in the fastening device of the plate stamping type suspension string clamp, the tightening torque value of the nut that produces the clamping force on the parts should be greater than or equal to 85% of the tightening torque value before the vibration test; in the fastening devices of other parts, the tightening torque value of the nut that produces the clamping force on the parts should be greater than or equal to 90% of the tightening torque value before the vibration test; d) According to the installation state of the actual tightening torque of the bolts after the vibration test, the sliding load test is carried out on the components, and the sliding load decreases less than or equal to 5% of the specified value.

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