Calibration device for railway bearing magneto-sensitive speed measurement sensor

Abstract

The invention provides a calibration device for a railway bearing magneto-sensitive speed measurement sensor, which comprises a stand column, a rotating disc assembly, a magnetism measurement assembly and a controller, and is characterized in that the rotating disc assembly is rotatably arranged at the upper end of the stand column and is used for placing a to-be-measured sensor and driving the to-be-measured sensor to rotate at a preset rotating speed; the magnetism measuring assembly is connected to the stand column and used for collecting the total number of pulse signals of the to-be-measured sensor during rotation within a preset time period. According to the embodiment, the controller determines the pulse signal frequency according to the total number of the pulse signals and the preset duration, determines the linear speed according to the preset rotating speed and the diameter of the vehicle bearing detected by the sensor to be detected, and finally determines the calibration coefficient according to the pulse signal frequency and the linear speed. Therefore, by re-determining the calibration coefficient, the measurement error caused by magnetic field attenuation is compensated, and the strict corresponding relation between the pulse signal output by the sensor and the real rotating speed is ensured. Accurate running speed control of the railway vehicle is ensured, and running safety is ensured.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a calibration device for a magnetically sensitive speed sensor of a railway bearing. Background Art

[0002] The axle box bearings of railway vehicles are equipped with magnetic speed sensors to measure vehicle speed. The ferromagnetic permanent magnet induction ring is the core component of the magnetic speed sensor.

[0003] When the total operating time of the railway axle box bearing reaches more than 15 years, the magnetic induction intensity of the ferromagnetic permanent magnet induction ring may decay over time. When the magnetic induction intensity decays to a certain extent, the sensitivity of the magnetic speed sensor will decrease, resulting in inaccurate speed measurement.

[0004] Since railway operation safety is a heavy responsibility, speed control is crucial to operation safety. When the vehicle mileage reaches 400,000 to 600,000 kilometers, the axle box bearings need to be inspected and repaired, and the magnetic speed sensor needs to be calibrated during the inspection.

[0005] However, there is currently no relevant technology in the industry to test or calibrate this, and it is usually only sent to the original factory or only tested for appearance.

[0006] As the mileage of subways in operation in my country continues to increase, the number of bearings that need to be inspected and repaired is increasing day by day, so there is an urgent need to solve the problem of calibration of magnetic speed sensors. Summary of the Invention

[0007] The content of this disclosure is intended to briefly introduce concepts that will be described in detail in the detailed description below. The content of this disclosure is not intended to identify key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0008] Some embodiments of the present invention provide a calibration device for a magnetic speed sensor of a railway bearing to solve the technical problems mentioned in the above background technology section.

[0009] The calibration device for the magnetic sensitive speed sensor of railway bearings includes a column, a rotating disk assembly, a magnetic measuring assembly and a controller, wherein: The rotating disk assembly is rotatably mounted on the upper end of the column, and is used to place the sensor to be tested and drive the sensor to be tested to rotate at a preset speed; The magnetic measuring component is connected to the column and is used to collect the total number of pulse signals of the sensor to be measured during rotation within a preset time period; The controller determines the pulse signal frequency based on the total number of pulse signals and the preset duration, and determines the linear speed based on the preset rotation speed and the diameter of the vehicle bearing detected by the sensor to be tested, and finally determines the calibration coefficient based on the pulse signal frequency and the linear speed.

[0010] Optionally, the rotating disk assembly includes a motor and a rotating disk, the motor is arranged inside the upper end of the column, and the transmission shaft of the motor is connected to the rotating disk.

[0011] Optionally, a stop is provided at the upper end of the rotating disk. During the detection process, the sensor to be tested is buckled onto the stop and rotates synchronously with the rotating disk.

[0012] Optionally, an upper support is fixedly provided at the top end of the column, and a bearing is fixedly provided inside the upper support.

[0013] Optionally, the longitudinal section of the rotating disk is T-shaped, and the bottom of the rotating disk is engaged with the inner ring of the bearing and connected to the transmission shaft of the motor.

[0014] Optionally, the magnetic measuring assembly includes a bracket and a magnetic measuring device connected to each other, the bracket is connected to the column, and the magnetic measuring device is adapted to the height of the sensor to be measured.

[0015] Optionally, the magnetic measuring device includes one of the following: a magnetic measuring pen, a pulse counter.

[0016] Optionally, the column is also connected to a timer linked to the motor.

[0017] Optionally, the bottom of the column is connected to a base.

[0018] Optionally, the column is made of aluminum alloy material; the rotating disk is made of nylon material.

[0019] The above embodiments of the present invention have the following beneficial effects: The sensor to be tested is driven to rotate at a preset speed by the rotating disk assembly, and the total number of pulse signals during the rotation of the sensor to be tested within a preset time period is collected by the magnetic measuring assembly, so that the controller can determine the pulse signal frequency and linear speed, and finally determine the calibration coefficient.

[0020] By re-determining the calibration coefficient, the measurement error caused by magnetic field attenuation is compensated, ensuring that the pulse signal output by the sensor maintains a strict correspondence with the actual speed. This ensures that railway vehicles can accurately control their driving speed and ensure driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a structural schematic diagram of an embodiment of a calibration device for a magnetic speed sensor for railway bearings according to the present invention; Description of reference numerals: 1. Magnetic measuring device; 2. Bearing; 3. Motor; 4. Bracket; 5. Base; 6. Column; 7. Timer; 8. Upper support; 9. Rotating disk; 10. Sensor to be measured. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0026] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] See also Figure 1 , Figure 1 FIG. 1 is a schematic structural diagram of an embodiment of a calibration device for a magnetic speed sensor of a railway bearing according to the present invention. Figure 1 As shown, the calibration device for a railway bearing magnetic speed sensor of the present invention includes a base 5, to which a column 6 is fixedly connected. A rotating disk assembly is disposed at the upper end of column 6. This rotating disk assembly is rotatable relative to column 6 and is used to position a sensor 10 to be tested and to rotate the sensor 10 at a preset rotational speed. The sensor 10 to be tested is the magnetic speed sensor to be calibrated.

[0028] Specifically, the rotating disk assembly includes a motor 3 and a rotating disk 9. The motor 3 can be mounted inside the upper end of the column 6, with the drive shaft of the motor 3 extending upward from the column 6 and connected to the bottom of the rotating disk 9. The motor 3 can be a low-speed motor with a rotational speed of 2 rpm. Of course, those skilled in the art can adjust the speed according to actual conditions.

[0029] In order to avoid electromagnetic interference, the pillar 6 can be made of aluminum alloy. The rotating disk 9 is made of nylon.

[0030] The upper end of the rotating disk 9 is provided with a stopper, which can be a positioning boss. During the testing process, the sensor 10 to be tested can be buckled onto the stopper, that is, the inner edge of the sensor 10 to be tested is firmly connected to the outer edge of the stopper, so that the sensor 10 to be tested rotates synchronously with the rotation of the rotating disk 9 driven by the motor 3.

[0031] Furthermore, in order to improve the stability of the rotating disk 9 during rotation, an upper support 8 is fixedly provided at the upper end of the column 6, and a bearing 2 is fixedly provided inside the upper support 8, that is, the outer ring of the bearing 2 is fixedly connected to the upper support 8. Figure 1 As shown, the rotating disk 9 can have a T-shaped longitudinal cross-section. The bottom of the rotating disk 9 engages with the inner ring of the bearing 2 and is connected to the drive shaft of the motor 3. During the detection process, the upper support 8 and the bearing 2 prevent the rotating disk 9 from shaking during rotation, thereby improving the reliability of the detection. As an example, the bearing 2 can be a spherical roller bearing with seals on both ends.

[0032] The calibration device also includes a magnetic measurement component for collecting the total number of pulse signals of the sensor 10 to be measured within a preset time period. Specifically, the magnetic measurement component includes a bracket 4 and a magnetic measurement device 1 connected to each other, and the bracket 4 is connected to the column 6.

[0033] It should be noted that when the sensor 10 rotates, the magnetic grid of the ferromagnetic permanent magnetic induction ring in the sensor 10 approaches the magnetic measuring device 1, resulting in a change in magnetic induction intensity, which generates a pulse signal. The magnetic measuring device 1 is used to collect the total number of pulse signals. Therefore, the height of the magnetic measuring device 1 is adjusted to match the height of the sensor 10 to improve the accuracy of collecting the total number of pulse signals from the rotating sensor 10. Furthermore, the total number of pulse signals can be measured 2-3 times continuously, and the average value is taken as the final total number of pulse signals.

[0034] As an example, the magnetic measuring device 1 includes but is not limited to a magnetic measuring pen, or a counter module of the Siemens FM350 or Mitsubishi FX5U-HSC model, or a pulse counter of the Hioki MR8880 model, etc. Those skilled in the art can make the selection according to actual conditions.

[0035] The calibration device may further include a controller, which is in communication with the motor 3 and the magnetic measuring device 1. The controller can control the start and stop or the speed of the motor 3, and receive the total number of pulse signals sent by the magnetic measuring device 1.

[0036] Furthermore, a timer may be provided within the controller, and the timer is set to the preset duration, so that the controller can control the operating duration of the motor 3 according to the preset duration, thereby controlling the rotation duration of the sensor 10 to be tested. Those skilled in the art may determine the controller based on actual circumstances. For example, the controller may be an MCU (Microcontroller Unit), a PLC (Programmable Logic Controller), a DSP (Digital Signal Processor), etc.

[0037] Furthermore, a timer 7 with a preset duration can be connected to the column 6. This timer 7 can be linked to the motor 3. For example, when the timer 7 starts, the motor 3 begins rotating. When the timer 7 stops, the motor 3 stops rotating, thereby controlling the rotation duration of the sensor 10 under test according to the preset duration. Of course, the timer 7 can also be communicatively connected to a controller, which controls the operation of the motor 3 based on the start and stop of the timer 7.

[0038] In the process of determining the calibration coefficient, the controller first converts the rotation speed of the rotating disk 9 into the linear speed according to the following formula: in, Indicates linear velocity; represents the diameter of the vehicle bearing detected by the sensor 10; represents the rotational speed of the rotating disk 9 , which can be determined by the rotational speed of the motor 3 .

[0039] Next, the controller determines the pulse frequency from the total number of pulse signals according to the following formula: in, Indicates the pulse frequency; Indicates the total number of pulse signals, collected by the magnetic measuring device 1.

[0040] Indicates the preset duration, which is determined by timer 7.

[0041] Finally, the controller determines the calibration factor according to the following formula: .

[0042] After the calibration coefficient is determined, when the sensor determines the vehicle speed, the product of the detected pulse frequency and the determined calibration coefficient can be used as the vehicle speed.

[0043] In this way, the calibration coefficient can be re-determined to compensate for the measurement error caused by magnetic field attenuation, ensuring that the pulse signal output by the sensor maintains a strict correspondence with the actual speed. This ensures that railway vehicles can accurately control their driving speed and ensure driving safety.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A calibration device for a magnetic speed sensor of a railway bearing, characterized in that: It includes a column, a rotating disk assembly, a magnetic measuring assembly and a controller, wherein: The rotating disk assembly is rotatably mounted on the upper end of the column, and is used to place the sensor to be tested and drive the sensor to be tested to rotate at a preset speed; The magnetic measuring component is connected to the column and is used to collect the total number of pulse signals of the sensor to be measured during rotation within a preset time period; The controller determines the pulse signal frequency based on the total number of pulse signals and the preset duration, and determines the linear speed based on the preset rotation speed and the diameter of the vehicle bearing detected by the sensor to be tested, and finally determines the calibration coefficient based on the pulse signal frequency and the linear speed.

2. The calibration device for a railway bearing magnetic speed sensor according to claim 1, characterized in that: The rotating disk assembly includes a motor and a rotating disk. The motor is arranged inside the upper end of the column, and the transmission shaft of the motor is connected to the rotating disk.

3. The calibration device for a railway bearing magnetic speed sensor according to claim 2, characterized in that: A stop is provided at the upper end of the rotating disk. During the detection process, the sensor to be tested is buckled onto the stop and rotates synchronously with the rotating disk.

4. The calibration device for a railway bearing magnetic speed sensor according to claim 3, characterized in that: An upper support is fixedly provided at the top end of the column, and a bearing is fixedly provided in the upper support.

5. The calibration device for a railway bearing magnetic speed sensor according to claim 4, characterized in that: The longitudinal section of the rotating disk is T-shaped, and the bottom of the rotating disk is engaged with the inner ring of the bearing and connected to the transmission shaft of the motor.

6. The calibration device for a railway bearing magnetic speed sensor according to claim 1, characterized in that: The magnetic measuring assembly includes a bracket and a magnetic measuring device connected to each other, the bracket is connected to the column, and the magnetic measuring device is adapted to the height of the sensor to be measured.

7. The calibration device for a railway bearing magnetic speed sensor according to claim 6, characterized in that: The magnetic measuring device includes one of the following items: a magnetic measuring pen and a pulse counter.

8. The calibration device for a railway bearing magnetic speed sensor according to claim 2, characterized in that: The column is also connected to a timer linked with the motor.

9. The calibration device for a railway bearing magnetic speed sensor according to claim 1, characterized in that: The bottom of the column is connected with a base.

10. The calibration device for a railway bearing magnetic speed sensor according to claim 2, characterized in that: The upright column is made of aluminum alloy material; the rotating disk is made of nylon material.

Images