Method for detecting aging of sealing element of train brake cylinder based on olfaction

Abstract

The invention discloses a method for detecting aging of a sealing element of a train brake cylinder based on olfaction, which is used for monitoring the gas leakage condition in real time so as to realize high-sensitivity dynamic sealing performance detection. An inner cavity of the brake cylinder is communicated with the auxiliary air cylinder through a first air pipeline, the brake cylinder is provided with a sealing gasket, and an air inlet and outlet pipeline penetrates through the sealing gasket to be communicated with the inner cavity of the brake cylinder. A gas release device is installed in the auxiliary air cylinder, when a train is in a braking state, the release device releases gas into the auxiliary air cylinder at a constant speed, the gas enters an inner cavity of a brake cylinder, and the gas can be sensed by an olfactory sensor; the minimum gas leakage threshold value in the failure leakage state of the sealing gasket is preset and judged; all the olfactory sensors are connected to a data acquisition and analysis module, the data acquisition and analysis module processes sensor signals in real time, and whether the sealing gasket fails or not is judged through a real-time leakage value obtained through detection and analysis.

Description

Technical Field

[0001] The invention relates to the technical field of sealing performance detection, and in particular to a method for detecting aging of a train brake cylinder seal based on smell. Background Art

[0002] The train braking system relies on air compression to drive. The brake cylinder is a core component, and its sealing performance directly affects the braking effect and operational safety. Therefore, the brake cylinder needs to be inspected regularly to ensure the braking effect and operational safety. However, the existing sealing performance detection methods mainly rely on manual inspection or pressure monitoring, which has the problems of low efficiency, insufficient sensitivity and poor adaptability to dynamic working conditions.

[0003] Therefore, it is urgent to develop an efficient and sensitive detection method suitable for the aging performance detection of train brake cylinder seals. Summary of the invention

[0004] In view of the above problems, the present invention provides a method for detecting the aging of train brake cylinder seals based on smell, which monitors gas leakage in real time, thereby achieving high-sensitivity dynamic sealing detection.

[0005] A method for detecting the aging of a train brake cylinder seal based on smell, the technical solution of which is as follows: the inner cavity of the brake cylinder is connected to the auxiliary air cylinder through a first gas pipeline, the brake cylinder is provided with a sealing gasket, and the inlet and outlet gas pipelines penetrate the sealing gasket to connect to the inner cavity of the brake cylinder, characterized in that:

[0006] A plurality of olfactory sensors are arranged around the outer ring of the sealing gasket; a gas release device is installed inside the auxiliary air cylinder. When the train is in a braking state, the release device releases gas into the auxiliary air cylinder at a constant speed, and the gas enters the inner cavity of the brake cylinder through the first gas pipeline. The gas is the gas that can be sensed by the olfactory sensor; a minimum gas leakage threshold for determining the failure and leakage state of the sealing gasket is pre-set;

[0007] All olfactory sensors are connected to the data acquisition and analysis module, which processes the sensor signals in real time, obtains the real-time leakage value through detection and analysis, and compares the real-time leakage value with the minimum gas leakage threshold under the sealing gasket failure leakage state to determine whether the sealing gasket has failed;

[0008] After detecting the failure of the gasket, the alarm and display module will sound an alarm and provide information on the leakage amount and leakage location.

[0009] It is further characterized by:

[0010] A temperature and humidity sensor is also installed around the sealing pad. Through the real-time temperature and humidity, an environmental interference compensation module is provided in the data acquisition and analysis module. The environmental interference compensation module compensates and corrects the olfactory sensor data collected according to the temperature and humidity. After that, the data acquisition and analysis module obtains the compensated and corrected value to ensure that the results obtained by the data acquisition and analysis module are accurate and reliable;

[0011] For the olfactory sensor, generally speaking, the higher the temperature, the higher the output value, and the higher the humidity, the higher the output value. Therefore, it is necessary to collect the temperature and humidity values ​​during the braking process, and then perform compensation correction through the environmental interference compensation module;

[0012] The gas is sulfur hexafluoride gas;

[0013] Three olfactory sensors are arranged at 120° intervals on the outer circumference of the sealing pad. When the train starts braking, each olfactory sensor outputs the gas concentration value to the data acquisition and analysis module in real time. The data acquisition and analysis module collects data at a frequency of 1 Hz.

[0014] The data acquisition and analysis module first determines the effectiveness of the olfactory sensor based on the numerical output of each olfactory sensor. If there is a sudden change in the data at 1Hz, the corresponding olfactory sensor will be recorded as failed. After the failed olfactory sensor is removed, the numerical output of all the olfactory sensors that are not failed is calculated and the calculation is continued at a frequency of 1Hz during the train braking process.

[0015] The data acquisition and analysis module reads the temperature and humidity sensor readings. If the temperature and humidity are higher than the reference standard temperature and humidity, the olfactory sensor value is adjusted down accordingly according to the percentage of excess. If the temperature and humidity are lower than the reference standard temperature and humidity, the olfactory sensor value is adjusted up accordingly by the same proportion to compensate and calibrate the accuracy of the olfactory sensor value. When the average gas concentration exceeds the limit, the alarm and display module sounds an alarm, indicating that the sealing gasket has failed.

[0016] The reference standard temperature and humidity values ​​are the temperature and humidity values ​​when the train is in normal running state without braking;

[0017] The olfactory sensor is an electrochemical olfactory sensor, and the gas release device is installed inside the auxiliary air cylinder. When the train brakes, gas is released into the auxiliary air cylinder at a rate of 1 ml / minute; the data acquisition and analysis module is installed in the train driver's cab, displays the test result data in real time, and has the function of data saving and downloading; the environmental interference compensation module uses a temperature and humidity sensor, and transmits the temperature and humidity to the data acquisition and analysis module, and adjusts the output value of the olfactory sensor according to the temperature and humidity during detection.

[0018] After adopting the present invention, during the operation of the brake cylinder, the olfactory sensor monitors the changes in gas concentration outside the sealing gasket in real time to determine whether there is a leak in the sealing gasket. It has the characteristics of high sensitivity, real-time, non-contact and strong adaptability, and can detect extremely small gas leaks with an accuracy of ppm level. The sensor is external and does not affect the normal operation of the brake cylinder. It can be used in complex environments with vibration, temperature and humidity changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the arrangement of the olfactory sensor and the gas release device of the present invention;

[0020] The names corresponding to the serial numbers in the figure are as follows:

[0021] Brake cylinder 10 , first gas pipeline 11 , inlet and outlet gas pipelines 12 , auxiliary air cylinder 20 , sealing gasket 30 , olfactory sensor 40 , gas release device 50 , temperature and humidity sensor 60 . DETAILED DESCRIPTION

[0022] A method for detecting the aging of train brake cylinder seals based on olfactory detection, see Figure 1 : The inner cavity of the brake cylinder 10 is connected to the auxiliary air cylinder 20 through the first gas pipeline 11, the brake cylinder 10 is provided with a sealing gasket 30, and the inlet and outlet gas pipelines 12 penetrate the sealing gasket 30 and are connected to the inner cavity of the brake cylinder 10;

[0023] A plurality of olfactory sensors 40 are arranged around the outer ring of the sealing gasket 30; a gas release device 50 is installed inside the auxiliary air cylinder 20. When the train is in a braking state, the gas release device 50 releases gas into the auxiliary air cylinder 20 at a constant speed, and the gas enters the inner cavity of the brake cylinder 10 through the first gas pipeline 11. The gas is the gas that the olfactory sensor 40 can sense; the minimum gas leakage threshold for judging the sealing gasket failure leakage state is pre-set;

[0024] All olfactory sensors 40 are connected to the data acquisition and analysis module, which processes the signals of the olfactory sensors 40 in real time, compares the real-time leakage value obtained by detection and analysis with the minimum gas leakage threshold value under the sealing gasket failure leakage state, and determines whether the sealing gasket fails;

[0025] After detecting the failure of the gasket, the alarm and display module will sound an alarm and provide information on the leakage amount and leakage location.

[0026] During specific implementation: the gas is sulfur hexafluoride gas;

[0027] Three olfactory sensors 40 are arranged at intervals of 120° on the outer circumference of the sealing pad 30. When the train starts braking, each olfactory sensor 40 outputs a gas concentration value to the data acquisition and analysis module in real time. The data acquisition and analysis module collects data at a frequency of 1 Hz.

[0028] A temperature and humidity sensor 60 is also installed around the sealing pad 30. Through the real-time temperature and humidity, an environmental interference compensation module is set in the data acquisition and analysis module. The environmental interference compensation module compensates and corrects the data collected by the olfactory sensor 40 according to the temperature and humidity. After that, the data acquisition and analysis module obtains the compensated and corrected value to ensure that the results obtained by the data acquisition and analysis module are accurate and reliable;

[0029] For the olfactory sensor 40, generally, the higher the temperature, the higher the output value, and the higher the humidity, the higher the output value, so it is necessary to collect temperature and humidity values ​​during the braking process, and then perform compensation correction through the environmental interference compensation module;

[0030] The data acquisition and analysis module first determines the validity of the olfactory sensor 40 according to the numerical output of each olfactory sensor 40. If there is a sudden change in the data at 1 Hz, for example, the data fluctuates by more than 200% within two consecutive seconds, the corresponding olfactory sensor 40 will be recorded as failed. After the failed olfactory sensor 40 is removed, the average value of the numerical output of all the olfactory sensors 40 that are not failed is calculated, and the calculation is continued at a frequency of 1 Hz during the train braking process;

[0031] The data acquisition and analysis module reads the temperature and humidity sensor readings. If the temperature and humidity are higher than the reference standard temperature and humidity, the value of the olfactory sensor 30 is adjusted down accordingly according to the percentage of excess. If the temperature and humidity are lower than the reference standard temperature and humidity, the value of the olfactory sensor 30 is adjusted up accordingly by the same proportion to compensate and calibrate the value accuracy of the olfactory sensor 30. When the average gas concentration exceeds the limit, the alarm and display module alarms, indicating that the sealing gasket 30 is failed.

[0032] The reference standard temperature and humidity values ​​are the temperature and humidity values ​​when the train is in normal driving state without braking.

[0033] In specific implementation, the olfactory sensor 40 is an electrochemical olfactory sensor, and the gas release device 50 is installed inside the auxiliary air cylinder 20. When the train brakes, gas is released into the auxiliary air cylinder 20 at a rate of 1 ml / minute; the data acquisition and analysis module is installed in the train driver's cab, and displays the test result data in real time, and has the function of data saving and downloading. The environmental interference compensation module uses the temperature and humidity sensor 60, and transmits the temperature and humidity to the data acquisition and analysis module, and adjusts the output value of the olfactory sensor 40 according to the temperature and humidity during the detection, thereby ensuring the accuracy and reliability of the detection.

[0034] During the operation of the brake cylinder, the olfactory sensor monitors the changes in gas concentration outside the sealing gasket in real time to determine whether there is a leak in the sealing gasket. It has the characteristics of high sensitivity, real-time, non-contact and strong adaptability. It can detect extremely small gas leaks with an accuracy of ppm level. The sensor is external and does not affect the normal operation of the brake cylinder. It can be used in complex environments with vibration, temperature and humidity changes.

[0035] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for detecting the aging of a train brake cylinder seal based on smell, wherein the inner cavity of the brake cylinder is connected to the auxiliary air cylinder through a first gas pipeline, the brake cylinder is provided with a sealing gasket, and the inlet and outlet gas pipelines penetrate the sealing gasket to connect to the inner cavity of the brake cylinder, characterized in that: A plurality of olfactory sensors are arranged around the outer ring of the sealing gasket; a gas release device is installed inside the auxiliary air cylinder. When the train is in a braking state, the release device releases gas into the auxiliary air cylinder at a constant speed, and the gas enters the inner cavity of the brake cylinder through the first gas pipeline. The gas is the gas that can be sensed by the olfactory sensor; a minimum gas leakage threshold for determining the failure and leakage state of the sealing gasket is pre-set; All olfactory sensors are connected to the data acquisition and analysis module, which processes the sensor signals in real time, obtains the real-time leakage value through detection and analysis, and compares the real-time leakage value with the minimum gas leakage threshold under the sealing gasket failure leakage state to determine whether the sealing gasket has failed; After detecting the failure of the gasket, the alarm and display module will sound an alarm and provide information on the leakage amount and leakage location.

2. The method for detecting aging of train brake cylinder seals based on smell according to claim 1 is characterized in that: A temperature and humidity sensor is also installed around the sealing gasket. Through the real-time temperature and humidity, an environmental interference compensation module is provided in the data acquisition and analysis module. The environmental interference compensation module compensates and corrects the olfactory sensor data collected according to the temperature and humidity. After that, the data acquisition and analysis module obtains the compensated and corrected value to ensure that the results obtained by the data acquisition and analysis module are accurate and reliable.

3. The method for detecting aging of train brake cylinder seals based on smell according to claim 1 is characterized in that: The gas is sulfur hexafluoride gas.

4. The method for detecting aging of train brake cylinder seals based on smell according to claim 2 is characterized in that: Three olfactory sensors are arranged at 120° intervals on the outer circumference of the sealing pad. When the train starts to brake, each olfactory sensor outputs the gas concentration value to the data acquisition and analysis module in real time. The data acquisition and analysis module collects data at a frequency of 1 Hz.

5. The method for detecting aging of train brake cylinder seals based on smell according to claim 4 is characterized in that: The data acquisition and analysis module first determines the effectiveness of each olfactory sensor based on the numerical output of each olfactory sensor. If there is a sudden change in the 1Hz data, the corresponding olfactory sensor will be recorded as failed. After eliminating the failed olfactory sensors, the average value of the numerical output of all non-failed olfactory sensors is calculated and continued at a frequency of 1Hz during the train braking process.

6. The method for detecting aging of train brake cylinder seals based on smell according to claim 2, characterized in that: The data acquisition and analysis module reads the temperature and humidity sensor readings. If the temperature and humidity are higher than the reference standard temperature and humidity, the olfactory sensor value is lowered accordingly according to the excess percentage. If the temperature and humidity are lower than the reference standard temperature and humidity, the olfactory sensor value is increased accordingly in the same proportion to compensate and calibrate the accuracy of the olfactory sensor value. When the average gas concentration exceeds the limit, the alarm and display module sounds an alarm to indicate that the sealing gasket has failed.

7. The method for detecting aging of train brake cylinder seals based on smell according to claim 6 is characterized in that: The reference standard temperature and humidity values ​​are the temperature and humidity values ​​when the train is in normal driving state without braking.

8. The method for detecting aging of train brake cylinder seals based on smell according to claim 5, characterized in that: The olfactory sensor is an electrochemical olfactory sensor, and the gas release device is installed inside the auxiliary air cylinder. When the train brakes, gas is released into the auxiliary air cylinder at a rate of 1 ml / minute; the data acquisition and analysis module is installed in the train driver's cab, displays the test result data in real time, and has the function of data saving and downloading; the environmental interference compensation module uses a temperature and humidity sensor, and transmits the temperature and humidity to the data acquisition and analysis module, and adjusts the output value of the olfactory sensor according to the temperature and humidity during detection.

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