Measuring device for measuring rotating speed of bearing to be measured and method for measuring rotating speed of bearing

Abstract

The invention relates to a measuring device for measuring the rotating speed of a bearing to be measured and a method for measuring the rotating speed of the bearing. The measuring device comprises a frame configured to support and fix a first part of a bearing to be measured, and an optical fiber sensor configured to generate a counting signal based on a color on a second part of the bearing to be measured or a color of a synchronous rotating member synchronously rotating with the second part; and the data acquisition system is configured to receive the counting signal from the optical fiber sensor and calculate the rotating speed of the bearing to be measured based on the counting signal. The measuring device and the measuring method disclosed by the invention can accurately and reliably measure the speed of the ultrahigh rotating speed bearing.

Description

Technical Field

[0001] The present disclosure relates to a measuring device for measuring the rotational speed of a bearing to be measured and a method for measuring the rotational speed of a bearing. Background Art

[0002] In practice, it is often necessary to measure the rotational speed of bearings. Usually, this measurement is performed using photoelectric sensors. However, photoelectric sensors have many disadvantages. For example, measurement stability is not guaranteed, and there is a problem of signal loss, which makes the rotational speed measurement curve not smooth. Moreover, the maximum rotational speed of bearings that can be covered by photoelectric sensors is relatively low, generally around 30krpm, and at most 60krpm. For some new bearings, such as new ultra-high-speed bearings for textiles, the target speed is very high, for example, up to 150krpm. For such ultra-high-speed bearings, traditional photoelectric sensors cannot meet the requirements. In addition, traditional photoelectric sensors usually require a photosensitive patch or similar reflective component to excite the signal, and this reflective component will increase the imbalance of the rotor, especially at ultra-high speeds, and is prone to falling off. In addition, traditional photoelectric sensors are expensive and have strict requirements on the location of the sensor. If the distance between the sensor and the part to be measured is not appropriate, the measurement may fail.

[0003] It is hoped to provide a bearing speed measuring device that can accurately and reliably measure the speed of an ultra-high speed bearing. Summary of the Invention

[0004] In response to the problems and needs mentioned above, the present disclosure proposes a measuring device for measuring the speed of a bearing to be measured and a method for measuring the speed of a bearing to be measured. By adopting the following technical features, it solves the aforementioned problems of ordinary photoelectric sensors and brings other technical effects.

[0005] On the one hand, the present disclosure provides a measuring device for measuring the rotational speed of a bearing to be measured, wherein the bearing to be measured includes a first part and a second part that rotate relative to each other during operation, wherein the measuring device includes: a frame configured to support and fix the first part of the bearing to be measured; an optical fiber sensor configured to generate a counting signal based on the color on the second part of the bearing to be measured or the color of a synchronous rotating part that rotates synchronously with the second part; and a data acquisition system configured to receive the counting signal from the optical fiber sensor and calculate the rotational speed of the bearing to be measured based on the counting signal.

[0006] According to a preferred embodiment, the optical fiber sensor is configured to: emit light toward the second part of the bearing to be measured or the synchronous rotating part that rotates synchronously with the second part; receive reflected light from the second part of the bearing to be measured or the synchronous rotating part that rotates synchronously with the second part and identify the color; and emit different counting signals based on different colors.

[0007] According to a preferred embodiment, the measuring device further comprises a focusing lens, which is aligned with the emission end of the optical fiber sensor to focus the light emitted by the optical fiber sensor.

[0008] According to a preferred embodiment, the measuring device further comprises a sleeve in which the focusing lens is mounted, wherein the sleeve is threadedly connected to the optical fiber sensor, so that the distance between the focusing lens and the optical fiber sensor can be adjusted by rotating the sleeve relative to the optical fiber sensor.

[0009] According to a preferred embodiment, the measuring device further comprises a sensor bracket, one end of which is fixed to the frame and the other end of which is connected to the optical fiber sensor, wherein the position of the optical fiber sensor relative to the sensor bracket is adjustable.

[0010] According to a preferred embodiment, the optical fiber sensor passes through the through hole of the sensor bracket and is provided with an external thread, wherein the optical fiber sensor is fixed to the sensor bracket via a first nut and a second nut located on both sides of the through hole of the sensor bracket.

[0011] According to a preferred embodiment, the first part and the second part of the bearing to be tested are the outer ring and the inner ring of the bearing to be tested, respectively. The measuring device also includes a main shaft, which is configured to be fixedly connected to the inner ring of the bearing to be tested during the test. The synchronous rotating part is a stamping cup for being fixedly connected to the main shaft, and the stamping cup has a cup wall surrounding the axis of the main shaft. The distance between the cup wall and the axis of the main shaft is greater than the distance between the outer surface of the bearing to be tested and the axis of the main shaft. The optical fiber sensor generates a counting signal based on the color on the outer surface of the cup wall.

[0012] According to a preferred embodiment, the bearing to be tested is a special-shaped bearing, the first part of the bearing to be tested is the cylindrical outer part of the special-shaped bearing, the second part of the bearing to be tested includes a columnar inner part located within the outer part and an enlarged part at the end of the inner part that is integral with the inner part and has a radial dimension larger than that of the inner part; the optical fiber sensor generates a counting signal based on the color on the enlarged part.

[0013] The present disclosure also proposes a method for measuring the rotational speed of a bearing, wherein the bearing to be measured includes a first part and a second part that rotate relative to each other, wherein the method includes: forming a color area on the second part of the bearing to be measured or a synchronous rotating part that rotates synchronously with the second part of the bearing to be measured, the color area including at least a first sub-area with a first color and a second sub-area with a second color arranged along a circumferential direction; installing the bearing to be measured to a measuring device so that the first part of the bearing to be measured is fixed relative to the measuring device; generating a counting signal based on the color on the second part of the bearing to be measured or the color of the synchronous rotating part that rotates synchronously with the second part through an optical fiber sensor; receiving the counting signal from the optical fiber sensor through a data acquisition system, and calculating the rotational speed of the bearing to be measured based on the counting signal.

[0014] According to a preferred embodiment, when the first part and the second part of the bearing to be tested are the outer ring and the inner ring of the bearing to be tested, respectively, the method includes: fixedly connecting the inner ring of the bearing to be tested to the main shaft of the measuring device; forming the color area on a synchronous rotating part, and installing the synchronous rotating part to the main shaft of the measuring device, the synchronous rotating part is a stamping cup for being fixedly connected to the main shaft, the stamping cup has a cup wall surrounding the axis of the main shaft, and the distance between the cup wall and the axis of the main shaft is greater than the distance between the outer surface of the bearing to be tested and the axis of the main shaft; and generating a counting signal based on the color on the outer surface of the cup wall by a fiber optic sensor.

[0015] Hereinafter, the best embodiment for implementing the present disclosure will be described in more detail with reference to the accompanying drawings so that the features and advantages of the present disclosure can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings of the embodiments of the present disclosure. The drawings are only used to illustrate some embodiments of the present disclosure, and are not intended to limit all embodiments of the present disclosure to these drawings.

[0017] Figure 1 A schematic diagram showing the measurement of the rotational speed of a first type bearing using the measuring device disclosed herein is shown;

[0018] Figure 2 A schematic diagram showing, from another angle, measuring the rotational speed of a first type bearing using the measuring device disclosed herein;

[0019] Figure 3 The color setting of the first type of bearing is shown;

[0020] Figure 4 A schematic diagram showing a cross-sectional view of measuring the rotational speed of a second type bearing using the measuring device disclosed herein;

[0021] Figure 5A cross-sectional view at another angle shows a schematic diagram of measuring the rotational speed of a second type bearing using the measuring device disclosed herein;

[0022] Figure 6 A schematic diagram showing a method of measuring the rotational speed of a second type bearing using the measuring device disclosed herein is shown in perspective;

[0023] Figure 7 A schematic diagram showing the measurement of the rotational speed of a second type bearing using the measuring device of the present disclosure is shown from another angle.

[0024] Reference Signs List

[0025] 1 Bearing support part

[0026] 2 Extension

[0027] 3 Sensor bracket

[0028] 4 Data Acquisition System

[0029] 5 Fiber Optic Sensors

[0030] 6 sleeves

[0031] 7 Expansion

[0032] 8 Internal part

[0033] 9 External part

[0034] 10 Spindle

[0035] 11 First nut

[0036] 12 Second nut

[0037] 13 Punch Cup

[0038] 14 cup wall

[0039] 15 outer ring

[0040] 16 inner circle

[0041] 17 First sub-area

[0042] 18 Second sub-area

[0043] 19 Framework DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0045] Compared to the embodiments shown in the drawings, feasible embodiments within the scope of protection of the present disclosure may have fewer components, additional components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0046] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0047] The present disclosure relates to a measuring device and a bearing speed measurement method for measuring the speed of a bearing to be measured. The speed measurement device and the speed measurement method overcome the aforementioned shortcomings of traditional photoelectric sensor measurement and can accurately and reliably measure the speed of ultra-high speed bearings.

[0048] This measuring device is suitable for measuring various types of bearings, including but not limited to ball bearings, cylindrical roller bearings, needle roller bearings, tapered roller bearings, self-aligning bearings, non-self-aligning bearings, single-row bearings, double-row bearings, multi-row bearings, liquid-lubricated bearings, partially liquid-lubricated bearings, and non-lubricated bearings. Generally, the bearing to be tested has two parts that rotate relative to each other during operation. During testing, one part of the bearing to be tested is fixed to the measuring device, and the other part is rotated to measure the rotational speed of the other part. Herein, the two parts of the bearing are referred to as the first part and the second part, respectively, and the part that is fixed relative to the measuring device during testing is defined as the first part.

[0049] Attachment Figure 1-7 The measuring device of the present disclosure is presented, wherein, Figure 1-3 It involves measuring the rotational speed of a first type of bearing using the measuring device disclosed herein, Figure 4-7 The present invention relates to measuring the rotational speed of a second type of bearing using the measuring device disclosed herein. It should be noted that the first type of bearing and the second type of bearing shown in the figure are different bearings, but the two types of bearings can be measured using the same embodiment of the measuring device.

[0050] First, the overall structure and measurement principles applicable to various embodiments of the present disclosure are introduced.

[0051] The measuring device disclosed herein first includes a frame 19 configured to support and secure the first portion of the bearing under test. When the bearing under test is mounted on the measuring device, the first portion is fixed relative to the frame 19, while the second portion is rotatable relative to the frame 19. The purpose of the measuring device is to measure the rotational speed of the second portion of the bearing under test. The frame 19 also directly or indirectly supports other components of the measuring device, which will be described below.

[0052] The measuring device disclosed in the present invention also includes a fiber optic sensor 5 and a data acquisition system 4, which can be connected via an optical fiber. During the measurement, the position of the fiber optic sensor 5 is fixed relative to the measuring device. The fiber optic sensor 5 acts as a counter, which counts the color areas on the rotating rotating part to obtain a counting signal reflecting the number of rotations of the rotating part. The data acquisition system 4 is configured to receive the counting signal from the fiber optic sensor 5, and calculate the rotational speed of the rotating part to be measured based on the counting signal and in combination with the corresponding rotation time. Note that the rotating part mentioned here can be either the rotating part of the bearing to be measured or a component that rotates synchronously with the rotating part of the bearing to be measured.

[0053] The aforementioned color region on the rotating member is an area of identifiable color formed on the outer surface of the rotating member to be measured before the measurement begins. During measurement, the transmitting end of the optical fiber sensor 5 is aligned with this color region, so that the optical fiber sensor 5 can emit a light spot into this color region and receive light reflected from this color region to identify its color.

[0054] The color region may include two or more sub-regions arranged around the rotating part in a circumferential direction, each sub-region having its own color, and the colors of two adjacent sub-regions are different. Preferably, the color region includes only two sub-regions, namely a first sub-region having a first color and a second sub-region having a second color. In an alternative embodiment, the color region includes three sub-regions, each sub-region having a color different from the other sub-regions. In other alternative embodiments, the color region includes one or more sub-regions, and the colors of two adjacent sub-regions are different. The color region in the present disclosure can adopt various color combinations, and the color can include the color of the bearing itself, that is, the color region can retain the color of the bearing itself in part and be additionally colored in part.

[0055] Figure 3 A specific embodiment of a color region is shown, wherein the color region comprises a first sub-region 17 and a second sub-region 18, each occupying a 180-degree circumference. Preferably, the first sub-region 17 and the second sub-region 18 are black and blue, respectively. Black and blue have been shown to have high contrast and good recognition performance.

[0056] The fiber optic sensor 5 can emit different counting signals based on different colors. If the color region is formed by two subregions, the fiber optic sensor 5 can be configured to transmit an ON signal upon recognizing the first color and an OFF signal upon recognizing the second color. Each pair of ON / OFF signals transmitted represents one rotation of the rotating member. These ON / OFF signals are transmitted as counting signals to the data acquisition system 4. Based on the number of ON / OFF signals, the data acquisition system 4 determines the number of rotations of the rotating member and, therefore, the rotational speed. If the color region is formed by three or more subregions, the fiber optic sensor 5 can be configured to emit a first counting signal based on the first color, a second counting signal based on the second color, a third counting signal based on the third color, and so on.

[0057] As can be seen, the present disclosure measures rotational speed by applying color to the surface of the rotating part to be measured and using the fiber optic sensor 5 to identify and count the color. Because the color does not increase the imbalance of the rotating part and has minimal impact on high-speed rotating parts, the measurement device and method of the present disclosure can achieve stable and accurate data acquisition, thereby obtaining accurate bearing rotational speed, and are particularly suitable for high-speed rotational speed measurements.

[0058] The present disclosure does not limit the model or type of fiber optic sensor 5, as long as it can emit corresponding signals based on the different colors it recognizes. In one embodiment, the fiber optic sensor may include a light source, an optical fiber, and a photodetector. The light source generates light, which is transmitted through the optical fiber to the surface of the object to be detected. The light is then reflected or scattered by the surface and transmitted back through the optical fiber to the photodetector, where it is ultimately converted into an electrical signal for output. In a fiber optic sensor, color detection works based on the fact that light reflected from surfaces of different colors has different wavelengths. The shorter the wavelength, the bluer its color; the longer the wavelength, the redder its color. Therefore, by measuring the wavelength of light reflected from an object's surface, the object's color can be determined. In a fiber optic sensor, color can be described using the RGB color space. The RGB color space consists of three components: red, green, and blue, each with a value range of 0-255. By measuring the intensity of light reflected from an object's surface within the three wavelengths of red, green, and blue, the object's color in the RGB color space can be determined.

[0059] Preferably, a high-frequency optical fiber sensor 5 is used, with a frequency preferably greater than or equal to 2000 Hz, such as greater than or equal to 3000 Hz, such as greater than or equal to 4000 Hz. The optical fiber sensor 5 is typically suitable for measuring speeds in the range of 60 krpm to 240 krpm, and can measure a maximum speed of up to 1200 krpm.

[0060] Preferably, the measuring device further includes a focusing lens aligned with the emitting end of the optical fiber sensor 5 to focus the light emitted by the optical fiber sensor 5. The present disclosure does not impose any restrictions on the specific structure of the focusing lens or its distance from the optical fiber sensor 5, as long as it can focus the light emitted by the optical fiber sensor 5 to form a focused light spot on the rotating part to be measured.

[0061] By using a focusing lens matched with the optical fiber sensor 5, the light emitted by the sensor can be made more concentrated, so that different colors can be distinguished more easily and color transitions can be identified more accurately.

[0062] Preferably, the measuring device further comprises a sleeve 6 , and the focusing lens is installed in the sleeve 6 , for example, at an end of the sleeve 6 away from the optical fiber sensor 5 .

[0063] Preferably, the sleeve 6 has an internal thread, and the optical fiber sensor 5 has an external thread, and the sleeve 6 and optical fiber sensor 5 are threadedly connected. More preferably, the internal thread of the sleeve 6 and the external thread of the optical fiber sensor 5 are of sufficient length to allow the relative position of the optical fiber sensor 5 and the sleeve 6 to be adjusted by rotating the sleeve 6 relative to the optical fiber sensor 5, thereby adjusting the distance between the focusing lens and the optical fiber sensor 5. In this way, during testing, the size of the light spot projected by the optical fiber sensor 5 can be adjusted with a simple rotation.

[0064] Preferably, the frame 19 of the measuring device may include a bearing support portion 1 and an extension portion 2 located above the bearing support portion. The bearing support portion 1 has a hole for accommodating a bearing to be measured.

[0065] Preferably, the measuring device further comprises a sensor bracket 3, one end of the sensor bracket 3 is fixed to the frame 19 of the measuring device, such as the extension portion 2 of the frame 19, and the other end is connected to the optical fiber sensor 5. It is preferred that the position of the optical fiber sensor 5 relative to the sensor bracket 3 is adjustable so as to adjust the distance of the sensor relative to the rotating part to be measured. Preferably, as shown in the figure, the optical fiber sensor 5 passes through the through hole of the sensor bracket 3 and is provided with an external thread, wherein the optical fiber sensor 5 is fixed to the sensor bracket 3 by a first nut 11 and a second nut 12 located on both sides of the through hole of the sensor bracket 3. When it is desired to adjust the position of the optical fiber sensor 5, the first nut 11 and the second nut 12 can be removed, the position of the optical fiber sensor 5 relative to the sensor bracket 3 can be manually changed, and the first nut 11 and the second nut 12 can be retightened after the new position is determined.

[0066] Two measurement scenarios of the present disclosure are introduced below with reference to the accompanying drawings.

[0067] In this disclosure Figure 1-3 In the illustrated embodiment, the bearing to be tested is a profiled bearing comprising a cylindrical outer portion 9, a cylindrical inner portion 8 positioned within the outer portion 9, and an enlarged portion 7 at the end of the inner portion 8, which is radially larger than the inner portion 8. The enlarged portion 7 is integral with the inner portion 8. The outer portion 9 of the profiled bearing corresponds to the first portion of the bearing to be tested, which is fixed to the frame 19 of the measuring device. The inner portion 8 and the enlarged portion 7 together serve as the second portion of the bearing to be tested, which is also the rotating member to be measured.

[0068] In this measurement scenario, the color area is formed on the special-shaped bearing itself, specifically on the outer surface of the expansion part 7. The transmitting end of the optical fiber sensor 5 is aligned with the outer surface of the expansion part 7 and generates a counting signal based on the color on the expansion part 7.

[0069] The measurement method corresponding to this scenario may include the following steps. Unless a contradiction arises, the following steps do not have to be performed in the order described.

[0070] A color region is formed on the enlarged portion 7 of the profiled bearing to be tested, the color region including at least a first sub-region 17 having a first color and a second sub-region 18 having a second color arranged in the circumferential direction.

[0071] Mount the bearing to be tested on the measuring device so that its outer portion 9 is fixed relative to the device. The position of the fiber optic sensor 5 relative to the sensor holder 3 can be adjusted, as can the position of the focusing lens relative to the fiber optic sensor 5. Once adjusted, align the fiber optic sensor 5 with the colored area on the enlarged portion 7 of the bearing to be tested.

[0072] The inner portion 8 and the enlarged portion 7 of the bearing to be tested are rotated integrally, and a counting signal is generated by the optical fiber sensor 5 based on the color on the enlarged portion 7 of the bearing to be tested.

[0073] The data acquisition system 4 receives the counting signal from the optical fiber sensor 5 and calculates the rotational speed of the bearing to be measured based on the counting signal.

[0074] In this disclosure Figure 4-7 In the illustrated embodiment, the bearing under test is a conventional bearing having an inner ring 16 and an outer ring 15, which correspond to the second and first parts of the bearing under test, respectively. In this embodiment, the measuring device also includes a spindle 10, which is fixedly connected to the inner ring 16 of the bearing under test during testing. The measuring device also includes a synchronously rotating member, a rotating cup 13, which is fixedly connected to the spindle 10. The rotating cup can be formed by stamping. The rotating cup 13 has a cup wall 14 surrounding the axis of the spindle 10. The distance between the cup wall 14 and the axis of the spindle 10 is greater than the distance between the outer surface of the bearing under test and the axis of the spindle 10. In this measurement scenario, a color region is formed on the outer surface of the cup wall 14. The optical fiber sensor 5 generates a counting signal based on the color on the outer surface of the cup wall 14. The data acquisition system 4 calculates the rotational speed of the rotating cup 13 based on the counting signal. Since the rotating cup 13 , the main shaft 10 and the inner ring 16 of the bearing to be tested rotate synchronously, the rotational speed of the inner ring 16 of the bearing to be tested is also known.

[0075] The rotating cup 13 preferably has a cylindrical cup wall 14. Preferably, the diameter of the cylindrical cup wall 14 of the rotating cup 13 is larger than the diameter of the outer ring 15 of the bearing to be tested, and more preferably, the diameter of the cylindrical cup wall 14 of the rotating cup 13 is larger than twice the diameter of the outer ring 15 of the bearing to be tested.

[0076] In this measurement scenario, the dimensions of the bearing inner ring 16 and the spindle 10 are very small. If the bearing inner ring 16 or the spindle 10 were painted, the sensor's recognition area would also be very small, and the color might not be clearly recognized. By installing a large-diameter rotating cup 13 on the spindle 10 and positioning the sensor aligned with the surface of the rotating cup 13, the smaller measurement area can be converted to a larger one, ensuring better color recognition.

[0077] The measurement method corresponding to this scenario may include the following steps. Unless a contradiction arises, the following steps do not have to be performed in the order described.

[0078] A color region is formed on the outer surface of the rotary cup 13 of the measuring device. The color region includes at least a first subregion 17 having a first color and a second subregion 18 having a second color arranged in a circumferential direction.

[0079] The bearing to be tested is mounted to the measuring device such that the outer part 9 of the bearing to be tested is fixed relative to the measuring device and such that the inner part 8 of the bearing to be tested is fixed to the main shaft 10 of the measuring device.

[0080] Fix the rotating cup 13 to the main shaft 10 of the measuring device. Align the fiber optic sensor 5 with the color area on the rotating cup 13. The position of the fiber optic sensor 5 relative to the sensor holder 3 can be adjusted, and the position of the focusing lens relative to the fiber optic sensor 5 can be adjusted. Align the adjusted fiber optic sensor 5 with the color area on the enlarged portion 7 of the bearing to be measured.

[0081] By means of the optical fiber sensor 5 , a counting signal is generated based on the color in the color area.

[0082] The data acquisition system 4 receives the counting signal from the optical fiber sensor 5 and calculates the rotational speed of the bearing to be measured based on the counting signal.

[0083] The exemplary implementation schemes proposed in the present disclosure are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the scope of protection of the present disclosure, which is determined by the appended claims.

Claims

1. A measuring device for measuring the rotational speed of a bearing to be measured, wherein the bearing to be measured comprises a first part and a second part that rotate relative to each other during operation, wherein: The measuring device comprises: a frame configured to support and secure a first portion of the bearing to be tested; an optical fiber sensor configured to generate a counting signal based on a color on a second portion of the bearing to be measured or a color of a synchronously rotating member that rotates synchronously with the second portion; The data acquisition system is configured to receive the counting signal from the optical fiber sensor and calculate the rotational speed of the bearing to be measured based on the counting signal.

2. The measuring device according to claim 1, wherein The optical fiber sensor is configured as follows: emitting light toward a second portion of the bearing to be tested or a synchronously rotating member that rotates synchronously with the second portion; receiving reflected light from the second portion of the bearing to be tested or a synchronously rotating member that rotates synchronously with the second portion and identifying the color; Based on different colors, different counting signals are emitted.

3. The measuring device according to claim 1, wherein The measuring device further includes a focusing lens, which is aligned with the emission end of the optical fiber sensor to focus the light emitted by the optical fiber sensor.

4. The measuring device according to claim 3, wherein The measuring device further comprises a sleeve, wherein the focusing lens is mounted in the sleeve; The sleeve is connected to the optical fiber sensor via a thread, so that the distance between the focusing lens and the optical fiber sensor can be adjusted by rotating the sleeve relative to the optical fiber sensor.

5. The measuring device according to claim 1, wherein The measuring device further comprises a sensor bracket, one end of the sensor bracket is fixed to the frame, and the other end is connected to the optical fiber sensor; Wherein, the position of the optical fiber sensor relative to the sensor bracket is adjustable.

6. The measuring device according to claim 5, wherein The optical fiber sensor passes through the through hole of the sensor bracket, and the optical fiber sensor is provided with an external thread; Wherein, the optical fiber sensor is fixed to the sensor bracket through a first nut and a second nut located on both sides of the through hole of the sensor bracket.

7. The measuring device according to claim 1, wherein The first part and the second part of the bearing to be tested are the outer ring and the inner ring of the bearing to be tested respectively, and the measuring device further includes a main shaft, and the main shaft is configured to be fixedly connected to the inner ring of the bearing to be tested during the test process; The synchronous rotating member is a stamping cup fixedly connected to the main shaft, the stamping cup having a cup wall surrounding the axis of the main shaft, and the distance between the cup wall and the axis of the main shaft is greater than the distance between the outer surface of the bearing to be tested and the axis of the main shaft; The fiber optic sensor generates a counting signal based on the color on the outer surface of the cup wall.

8. The measuring device according to claim 1, wherein The bearing to be tested is a special-shaped bearing, the first part of the bearing to be tested is a cylindrical outer part of the special-shaped bearing, and the second part of the bearing to be tested includes a cylindrical inner part located within the outer part and an expanded part at an end of the inner part that is integrated with the inner part and has a radial dimension larger than that of the inner part; The optical fiber sensor generates a counting signal based on the color on the expanded portion.

9. A method for measuring the rotational speed of a bearing, wherein the bearing to be measured comprises a first part and a second part that rotate relative to each other, wherein: The method comprises: forming a color region on the second portion of the bearing to be tested or a synchronously rotating member that rotates synchronously with the second portion of the bearing to be tested, wherein the color region includes at least a first sub-region having a first color and a second sub-region having a second color arranged in a circumferential direction; Mounting the bearing to be tested to a measuring device so that the first portion of the bearing to be tested is fixed relative to the measuring device; generating a counting signal based on the color of a second portion of the bearing to be measured or the color of a synchronous rotating member that rotates synchronously with the second portion by means of an optical fiber sensor; The counting signal from the optical fiber sensor is received by a data acquisition system, and the rotational speed of the bearing to be measured is calculated based on the counting signal.

10. The method of claim 9, wherein: In a case where the first part and the second part of the bearing to be tested are respectively the outer ring and the inner ring of the bearing to be tested, the method includes: The inner ring of the bearing to be tested is fixedly connected to the main shaft of the measuring device; The color area is formed on a synchronous rotating member, and the synchronous rotating member is mounted on a main shaft of a measuring device, wherein the synchronous rotating member is a stamping cup fixedly connected to the main shaft, the stamping cup having a cup wall surrounding the axis of the main shaft, and the distance between the cup wall and the axis of the main shaft is greater than the distance between the outer surface of the bearing to be measured and the axis of the main shaft; A counting signal is generated based on the color on the outer surface of the cup wall by a fiber optic sensor.

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