On-line measurement system and method for AB value of ratchet wheel compensation device of electrified railway overhead line system based on tension measurement

Abstract

The invention relates to the technical field of railway catenary measurement, and discloses an electrified railway catenary ratchet wheel compensation device AB value online measurement system and method based on tension measurement, and the system comprises a tension measurement unit and an AB value calculation unit. The method comprises the following steps: (1) acquiring initial values of AB values and initial tension values of a contact line and a carrier cable, (2) measuring the tension values of the contact line and the carrier cable by a tension measuring unit by adopting a tension sensor at each sampling moment, and (3) measuring the tension values of the contact line and the carrier cable according to the tension values of the contact line and the carrier cable and the initial tension values of the contact line and the carrier cable. (4) according to the initial value of the AB value and the variable quantity of the AB value at each sampling moment, the AB value calculation unit calculates the real-time AB value at each sampling moment according to the initial value of the AB value and the variable quantity of the AB value at each sampling moment. The dynamic change of the AB value of the catenary ratchet compensation device is calculated through on-line detection of the tension of the contact line and the carrier cable, and the defects that the AB value of an existing catenary ratchet compensation device is inconvenient to detect, and the measurement precision is prone to being affected by the environment (dust and rainwater) are overcome. The method is of great significance to the development of the on-line measurement technology for the AB value of the ratchet compensation device of the overhead line system of the electrified railway.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of railway catenary measurement technology, and discloses an online measurement system and method for AB value of a ratchet compensation device of an electrified railway catenary based on tension measurement. BACKGROUND

[0002] The catenary is the only contact part of the train pantograph and the power supply system in the high-speed railway power supply system, and its safe operation is related to the safe operation of the high-speed train. In order to ensure that the line sag and tension change after the temperature change can be safe and stable, a catenary compensation device is arranged, which includes a contact line compensation device and a load cable compensation device, and the working principles of the two are the same. The component in the compensation device, i.e., the plummet, is used to adjust the compensation tension of the contact line and the load cable, and the tension of the line is kept balanced by the gravity of the plummet string. When the temperature changes, the expansion and contraction of the line make the plummet string rise and fall, and when the plummet string rises and falls beyond the allowed range, such as falling too much to make the bottom surface of the plummet string contact the ground or rising too much to make the ear ring hole of the plummet rod be clamped in the fixed pulley groove, the compensator will lose the compensation effect. Therefore, the A and B values of the compensator are used to limit the rising and falling range of the plummet string. The distance from the center of the ear ring hole of the plummet rod to the lower edge of the compensation (fixed) pulley is the A value. The distance from the bottom surface of the lowermost plummet of the plummet string to the ground (or the base surface) is called the B value of the compensator. The A and B values of the compensator change with the temperature and tension.

[0003] One of the existing measurement methods for the A and B values of the contact line and the load cable is to rely on manual on-line site measurement, which is low in efficiency, low in precision, high in safety risk, and cannot achieve online real-time detection. The second method is to use a patrol vehicle or the like to detect the compensation device regularly or irregularly, and the detection data obtained by this method is only the data at the measurement time, and online real-time detection cannot be achieved. The third method is to use a range finder installed on the plummet to measure the distance, and the disadvantage of this method is that the installation is difficult, and the measurement precision is easily affected by the environment (dust, rain). SUMMARY

[0004] (I) Technical problems to be solved

[0005] In view of the deficiencies of the prior art, the present application provides an online measurement system and method for AB value of a ratchet compensation device of an electrified railway catenary based on tension measurement, which solves the above problems.

[0006] (II) Technical solutions

[0007] In order to achieve the above-mentioned purposes, the present application provides the following technical solutions:

[0008] An online measurement system for AB value of a ratchet compensation device of an electrified railway catenary based on tension measurement, characterized in that it comprises a tension measurement unit and an AB value calculation unit.

[0009] tension measurement unit: for measuring the tension value of the contact line and the messenger wire by using the tension sensor, and transmitting the measured tension value to the AB value calculation unit after signal processing;

[0010] AB value calculation unit: for receiving the tension value transmitted by the tension measurement unit, calculating the change amount of the AB value, and calculating the real-time AB value;

[0011] The tension measurement unit includes a tension measurement sensor module, a tension signal acquisition module, and a data transmission module.

[0012] The AB value calculation unit includes an AB value change amount calculation module, an AB value calculation module, and a data transmission module.

[0013] Preferably, each catenary ratchet compensation device includes two devices: a contact line ratchet compensation device and a messenger wire ratchet compensation device, and one tension measurement unit is installed in each of the contact line ratchet compensation device and the messenger wire ratchet compensation device, i.e., one tension measurement unit is installed in the contact line ratchet compensation device, referred to as a contact line tension measurement unit; and one tension measurement unit is installed in the messenger wire ratchet compensation device, referred to as a messenger wire tension measurement unit.

[0014] The contact line tension measurement unit is fixedly installed on the compensation rope of the contact line ratchet, and the AB value of the contact line ratchet compensation device is calculated by measuring the tension value of the compensation rope of the contact line ratchet. The messenger wire tension measurement unit is fixedly installed on the compensation rope of the messenger wire ratchet, and the AB value of the messenger wire ratchet compensation device is calculated by measuring the tension value of the compensation rope of the messenger wire ratchet.

[0015] An AB value online measurement method for a catenary ratchet compensation device of an electrified railway based on tension measurement, characterized by comprising the following steps:

[0016] Step one, obtaining the initial values Ha and Hb of the AB value, and the initial tension values F0 of the contact line and the messenger wire;

[0017] Step two, at the sampling time t, the tension measurement unit measures the tension value F(t) of the compensation rope of the contact line or the messenger wire by using the tension sensor;

[0018] Step three, according to the tension value F(t) of the contact line or the messenger wire, the initial tension value F0 of the contact line and the messenger wire, and the AB value calculation unit, the AB value change amounts Δa(t) and Δb(t) at the sampling time t are calculated;

[0019] Step four, according to the initial value Ha and Hb of the AB value and the change amount Δa(t) and Δb(t) of the AB value, the AB value calculation unit calculates the real-time AB value of the sampling time t as Ha(t) and Hb(t).

[0020] Step five, according to the real-time AB value Ha(t) and Hb(t), if Ha(t) and Hb(t) exceed the set threshold value, an alarm information is sent out.

[0021] Preferably, the step three is specifically:

[0022] For the change amount Δa(t) of the sampling time t, the following method is used for calculation: Δa(t) = (F(t)-F0)*π*d / G

[0023] For the change amount Δb(t) of the sampling time t, the following method is used for calculation: Δb(t) = (F(t)-F0)*π*d / G

[0024] Wherein:

[0025] F(t) represents the sampling time t, the contact line or the force cable tension measuring unit (A10) uses a tension sensor to measure the tension value F(t) of the contact line or the force cable;

[0026] d represents the small wheel diameter in the ratchet structure in the ratchet compensation device;

[0027] G represents the total weight of the ratchet compensation device;

[0028] Preferably, the step four is specifically:

[0029] For the sampling time t, if the compensation rope tension of the contact line ratchet or the force cable ratchet increases, the ratchet is tightened, the plummet of the ratchet compensation device is lifted, the real-time A value is Ha(t) = Ha-Δa(t), and the real-time B value is Hb(t) = Hb+Δb(t);

[0030] For the sampling time t, if the compensation rope tension of the contact line ratchet or the force cable ratchet decreases, the ratchet is relaxed, the plummet of the ratchet compensation device is lowered, the real-time A value is Ha(t) = Ha+Δa(t), and the real-time B value is Hb(t) = Hb-Δb(t);

[0031] (Three) beneficial effects

[0032] Compared with the prior art, the present application provides an online measurement system and method for the AB value of the ratchet compensation device of the electrified railway contact network based on tension measurement, which has the following beneficial effects:

[0033] The present application realizes online real-time detection of the AB value of the catenary ratchet compensation device by online detection of the tension of the contact wire and the load-bearing cable, calculation of the dynamic change of the AB value of the catenary ratchet compensation device, solves the problems of low detection efficiency and the influence of the measurement precision by the environment (dust, rain) of the AB value of the existing catenary ratchet compensation device, and has important significance for the development of the online measurement technology of the AB value of the catenary ratchet compensation device of the electrified railway. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A structure diagram of an online measurement system of the AB value of the catenary ratchet compensation device of the electrified railway based on tension measurement is provided for the present application;

[0035] Figure 2 A general flowchart of an online measurement method of the AB value of the catenary ratchet compensation device of the electrified railway based on tension measurement is provided for the present application;

[0036] Figure 3 A structure diagram of the catenary ratchet compensation device of the electrified railway and an installation position diagram of the tension measurement unit are provided for the present application;

[0037] In the figure: 1, load-bearing cable ratchet compensation device; 2, compensation rope of the load-bearing cable ratchet; 3, tension measurement unit for the load-bearing cable; 4, contact wire ratchet compensation device; 5, compensation rope of the contact wire ratchet; 6, tension measurement unit for the contact wire; 7, load-bearing cable plummet; 8, contact network plummet;

[0038] Figure 4 A structure diagram of the ratchet in the catenary ratchet compensation device of the electrified railway is provided for the present application;

[0039] In the figure: 9, large wheel of the ratchet; 10, small wheel of the ratchet; 11, compensation rope; DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] Reference Figure 1 An online measurement system of the AB value of the catenary ratchet compensation device of the electrified railway based on tension measurement, comprising a tension measurement unit (A10) and an AB value calculation unit (A20);

[0042] Tension Measurement Unit (A10): Used to measure the tension value of the contact wire and the catenary using a tension sensor, and transmits the measured tension value to the AB value calculation unit after signal processing;

[0043] AB value calculation unit (A20): Used to receive the tension value transmitted by the tension measurement unit, calculate the change in AB value, and calculate the real-time AB value;

[0044] The tension measurement unit (A10) includes a tension measurement sensing module (A101), a tension signal acquisition module (A102), and a data transmission module (A103);

[0045] The AB value calculation unit (A20) includes an AB value change calculation module (A201), an AB value calculation module (A202), and a data transmission module (A203);

[0046] Combination Figure 3 Each contact wire ratchet compensation device (catcher wire ratchet compensation device 1 and contact wire ratchet compensation device 4) is equipped with a tension measuring unit (A10) (catcher wire tension measuring unit 3 and contact wire tension measuring unit 6), that is: the contact wire ratchet compensation device 4 is equipped with one of the aforementioned tension measuring units (A10), referred to as the contact wire tension measuring unit 6; the catcher wire ratchet compensation device 1 is equipped with one of the aforementioned tension measuring units, referred to as the catcher wire tension measuring unit 3.

[0047] Combination Figure 3 The contact wire tension measuring unit 6 is fixedly installed on the compensating rope 5 of the contact wire ratchet. By measuring the tension value of the compensating rope 5 of the contact wire ratchet, the AB value of the contact wire ratchet compensation device 4 is calculated. The catenary tension measuring unit 3 is fixedly installed on the compensating rope 2 of the catenary ratchet. By measuring the tension value of the compensating rope 2 of the catenary ratchet, the AB value of the catenary ratchet compensation device 1 is calculated.

[0048] See Figure 2 and Figure 1 An online measurement method for the AB value of a ratchet compensation device for an electrified railway contact network based on tension measurement includes the following steps:

[0049] S10, obtain the initial values ​​Ha and Hb of AB, and the initial tension value F0 of the contact wire and the catenary;

[0050] S20, at sampling time t, the tension measuring unit (A10) uses a tension sensor to measure the compensating rope tension value F(t) of the contact wire or the load-bearing cable;

[0051] S30, based on the tension value F(t) of the contact wire or the catenary and the initial tension value F0 of the contact wire and the catenary, the AB value calculation unit (A20) calculates the AB value change Δa(t) and Δb(t) at sampling time t;

[0052] S40, based on the initial values ​​Ha and Hb of the AB values, and the changes in the AB values ​​Δa(t) and Δb(t), the AB value calculation unit (A20) calculates the real-time AB values ​​at sampling time t as Ha(t) and Hb(t).

[0053] S50, based on the real-time AB values ​​Ha(t) and Hb(t), if Ha(t) and Hb(t) exceed the set threshold, an alarm message is issued.

[0054] Combination Figure 2 , Figure 3 and Figure 4 Specifically, S30 is as follows:

[0055] The change Δa(t) at sampling time t is calculated using the following method: Δa(t)=(F(t)-F0)*π*d / G

[0056] The change Δb(t) at sampling time t is calculated using the following method: Δb(t)=(F(t)-F0)*π*d / G

[0057] in:

[0058] F(t) represents the sampling time t. The contact wire or catenary tension measurement unit (A10) uses a tension sensor to measure the tension value F(t) of the contact wire or catenary.

[0059] d represents the diameter of the small wheel in the ratchet structure of the ratchet compensation device. Figure 4 The ratchet wheel 10 in the middle;

[0060] G represents the total weight of the weight in the ratchet compensation device. Figure 3 (7) The catenary weight or 8) in the catenary;

[0061] Combination Figure 2 Specifically, S40 is as follows:

[0062] For sampling time t, if the tension of the compensating rope of the contact wire ratchet or the catenary ratchet increases, the ratchet will tighten, and the dropper of the ratchet compensation device will be raised. The real-time value of A is Ha(t) = Ha - Δa(t), and the real-time value of B is Hb(t) = Hb + Δb(t).

[0063] For the sampling time t, if the compensation rope tension of the contact line ratchet or the force cable ratchet decreases, the ratchet is relaxed, the plummet of the ratchet compensation device is lowered, the real-time A value is Ha(t)=Ha+Δa(t), and the real-time B value is Hb(t)=Hb-Δb(t);

[0064] In the present application, the online measurement system and method for the AB value of the ratchet compensation device of the electrified railway catenary based on tension measurement are adopted in the embodiments of the present application. The dynamic change of the AB value of the catenary ratchet compensation device is calculated through online detection of the tension of the contact wire and the force cable, online real-time detection of the AB value of the catenary ratchet compensation device is realized, the deficiencies of low detection efficiency and easily affected measurement precision of the existing AB value detection of the catenary ratchet compensation device are solved, and the development of the online measurement technology for the AB value of the catenary ratchet compensation device has important significance.

[0065] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An online measurement system for the AB value of a ratchet compensation device for an electrified railway contact network based on tension measurement, characterized in that, Includes a tension measurement unit and an AB value calculation unit; Tension measurement unit: Used to measure the tension value of the contact wire and the catenary wire using a tension sensor, and transmits the measured tension value to the AB value calculation unit after signal processing; AB value calculation unit: used to receive the tension value transmitted by the tension measurement unit, calculate the change in AB value, and calculate the real-time AB value; The tension measurement unit includes a tension measurement sensing module, a tension signal acquisition module, and a data transmission module; The AB value calculation unit includes an AB value change calculation module, an AB value calculation module, and a data transmission module.

2. The online measurement system for the AB value of the ratchet compensation device for electrified railway contact network based on tension measurement according to claim 1, characterized in that: Each contact wire ratchet compensation device includes two devices: a contact wire ratchet compensation device and a catenary ratchet compensation device. One tension measuring unit is installed in each of the contact wire ratchet compensation devices; that is, the contact wire ratchet compensation device has one tension measuring unit installed, referred to as the contact wire tension measuring unit; the catenary ratchet compensation device has one tension measuring unit installed, referred to as the catenary tension measuring unit. The contact wire tension measuring unit is fixedly installed on the compensating rope of the contact wire ratchet. By measuring the tension value of the compensating rope of the contact wire ratchet, the AB value of the contact wire ratchet compensation device is calculated. The catenary tension measuring unit is fixedly installed on the compensating rope of the catenary ratchet. By measuring the tension value of the compensating rope of the catenary ratchet, the AB value of the catenary ratchet compensation device is calculated.

3. A method for online measurement of the AB value of an electrified railway contact wire ratchet compensation device based on tension measurement, using the online measurement system for the ratchet compensation device of an electrified railway contact wire based on tension measurement as described in claim 1, characterized in that, Includes the following steps: Step 1: Obtain the initial values ​​of AB, Ha and Hb, as well as the initial tension value F0 of the contact wire and the catenary. Step 2: At sampling time t, the tension measurement unit uses a tension sensor to measure the tension value F(t) of the compensating rope of the contact wire or the catenary. Step 3: Based on the tension value F(t) of the contact wire or the catenary and the initial tension value F0 of the contact wire and the catenary, the AB value calculation unit calculates the AB value changes Δa(t) and Δb(t) at sampling time t. Step four: Based on the initial values ​​Ha and Hb of the AB values, and the changes in the AB values ​​Δa(t) and Δb(t), the AB value calculation unit calculates the real-time AB values ​​Ha(t) and Hb(t) at sampling time t. Step 5: Based on the real-time AB values ​​Ha(t) and Hb(t), if Ha(t) and Hb(t) exceed the set threshold, an alarm message is issued.

4. The online measurement method for the AB value of the electrified railway contact network compensation device based on tension measurement according to claim 3, characterized in that, Step three specifically involves: The change Δa(t) at sampling time t is calculated using the following method: Δa(t)=(F(t)-F0)*π*d / G The change Δb(t) at sampling time t is calculated using the following method: Δb(t)=(F(t)-F0)*π*d / G in: F(t) represents the sampling time t. The contact wire or catenary tension measurement unit (A10) uses a tension sensor to measure the tension value F(t) of the contact wire or catenary. d represents the diameter of the small wheel in the ratchet body structure of the ratchet compensation device; G represents the total weight of the weights in the ratchet compensation device.

5. The online measurement method for the AB value of the electrified railway contact network compensation device based on tension measurement according to claim 3, characterized in that, Step four is as follows: For sampling time t, if the tension of the compensating rope of the contact wire ratchet or the catenary ratchet increases, the ratchet will tighten, and the dropper of the ratchet compensation device will be raised. The real-time value of A is Ha(t) = Ha - Δa(t), and the real-time value of B is Hb(t) = Hb + Δb(t). For sampling time t, if the tension of the compensating rope of the contact wire ratchet or the catenary ratchet decreases, the ratchet loosens, and the dropper of the ratchet compensation device descends, the real-time value of A is Ha(t)=Ha+Δa(t), and the real-time value of B is Hb(t)=Hb-Δb(t).

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