A bidirectional dynamic loading device for rolling bearings and a method for testing rolling bearings

Abstract

The application discloses a kind of rolling bearing bidirectional dynamic loading device and the testing method of rolling bearing, and rolling bearing bidirectional dynamic loading device includes: base, driving part, rotating spindle, first bearing seat, second bearing seat, exciter and telescopic loading frame;The inner ring of bearing is connected with rotating spindle;Telescopic loading frame is respectively with the outer ring of bearing on first bearing seat, the outer ring of bearing on second bearing seat abuts along the axial direction of rotating spindle, to load the vibration of exciter to bearing.In the application, the bearing on first bearing seat and the bearing on second bearing seat rotate under the driving of same rotating spindle, and vibrate under the excitation of same exciter, even if there is random environmental influence factor in experimental process, but it has substantially the same influence on two bearings, therefore, the vibration signal of two bearings can be collected, and the influence of random environmental influence factor can be offset by the vibration signal of two bearings.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing loading testing, and in particular to a rolling bearing bidirectional dynamic loading device and a rolling bearing testing method. Background Art

[0002] In the existing technology, traditional rolling bearing fault diagnosis test benches all apply loads to a single rolling bearing, collect the bearing's vibration signal through a sensor, and use an existing knowledge base to analyze the bearing's fault condition from the collected vibration signal. As long as the fault diagnosis conditions in the existing knowledge base are rich enough, a correct fault analysis can be obtained. However, this method is overly dependent on the amount of information in the knowledge base and cannot eliminate the environmental influencing factors randomly generated during the experiment. Even if some feature extraction methods are used to manually denoise the collected signals, the impact of environmental factors can only be reduced to a certain extent, and it cannot be truly eliminated, resulting in low accuracy in rolling bearing fault testing.

[0003] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rolling bearing bidirectional dynamic loading device and a rolling bearing testing method in response to the above-mentioned defects of the prior art, aiming to solve the problem of low accuracy of rolling bearing fault testing in the prior art.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] A bidirectional dynamic loading device for a rolling bearing, comprising:

[0007] base;

[0008] A driving member, disposed on the base;

[0009] a rotating spindle connected to the output shaft of the driving member;

[0010] A first bearing seat and a second bearing seat are both arranged on the base and used to install bearings; the first bearing seat and the second bearing seat are arranged along the axis direction of the rotating main shaft;

[0011] an exciter, disposed on the base;

[0012] a telescopic loading frame connected to the output shaft of the vibrator;

[0013] Wherein, the inner ring of the bearing is connected to the rotating main shaft;

[0014] The telescopic loading frame abuts against the outer ring of the bearing on the first bearing seat and the outer ring of the bearing on the second bearing seat respectively along the axial direction of the rotating main shaft to load the vibration of the exciter to the bearings.

[0015] The rolling bearing bidirectional dynamic loading device, wherein the telescopic loading frame is symmetrically arranged with respect to the axis of the output shaft of the exciter;

[0016] The telescopic loading frame comprises:

[0017] A fixed fulcrum device, arranged on the base;

[0018] A first fixing rod and a second fixing rod are arranged on a side of the fixed fulcrum device away from the rotating main axis;

[0019] A first telescopic rod and a second telescopic rod are arranged on a side of the fixed fulcrum device facing the rotating main shaft;

[0020] a third telescopic rod, wherein an end portion of the first telescopic rod and an end portion of the second telescopic rod are both connected to the third telescopic rod, and two ends of the third telescopic rod are respectively in contact with an outer ring of a bearing on the first bearing seat and an outer ring of a bearing on the second bearing seat;

[0021] A fixed frame, with two ends respectively connected to the fixed fulcrum device and the third telescopic rod;

[0022] a fourth telescopic rod, having two ends connected to the first fixed rod and the second fixed rod respectively;

[0023] a sleeve, both ends of which are respectively connected to the fourth telescopic rod and the output shaft of the exciter;

[0024] Wherein, the first fixing rod and the second fixing rod are symmetrically arranged with respect to the axis of the output shaft of the exciter;

[0025] The first telescopic rod and the second telescopic rod are symmetrically arranged about the axis of the output shaft of the exciter.

[0026] The rolling bearing bidirectional dynamic loading device, wherein the first telescopic rod comprises:

[0027] a first telescopic portion and a first fixed portion connected to each other, wherein an end portion of the first telescopic portion is connected to the fixed fulcrum device;

[0028] The second telescopic rod comprises:

[0029] a second telescopic portion and a second fixed portion connected to each other, wherein an end portion of the second telescopic portion is connected to the fixed fulcrum device;

[0030] The third telescopic rod comprises:

[0031] A third telescopic portion, a third fixed portion, and a fourth telescopic portion connected in sequence;

[0032] Wherein, the third telescopic portion is connected to the end of the first telescopic portion;

[0033] The fourth telescopic portion is connected to the end of the second telescopic portion;

[0034] An end portion of the fixing frame is connected to the third fixing portion.

[0035] The rolling bearing bidirectional dynamic loading device, wherein the fourth telescopic rod comprises:

[0036] a fifth telescopic portion, a fourth fixed portion, and a sixth telescopic portion connected in sequence;

[0037] Wherein, the end portion of the fifth telescopic portion is connected to the first fixing rod;

[0038] The end of the sixth telescopic portion is connected to the second fixing rod;

[0039] An end portion of the sleeve is connected to the fourth fixing portion.

[0040] The rolling bearing bidirectional dynamic loading device, wherein the rolling bearing bidirectional dynamic loading device further comprises:

[0041] The brake is arranged at one end of the rotating main shaft away from the driving member and is used to stop the rotation of the rotating main shaft.

[0042] The rolling bearing bidirectional dynamic loading device, wherein the brake is a magnetic powder brake.

[0043] A method for testing a rolling bearing, wherein the method is applied to the rolling bearing bidirectional dynamic loading device as described above, and the method comprises the steps of:

[0044] Install the target bearing and the bearing to be tested on the first bearing seat and the second bearing seat respectively;

[0045] Starting the driving member to drive the rotating main shaft to rotate, and driving the inner ring of the target bearing and the inner ring of the bearing to be tested to rotate;

[0046] Controlling the vibration exciter to generate vibration, and applying the vibration to the outer ring of the target bearing and the outer ring of the bearing to be tested through a telescopic loading frame;

[0047] Acquiring a vibration signal of the target bearing and a vibration signal of the bearing to be tested;

[0048] A test result of the bearing to be tested is obtained according to the vibration signal of the target bearing and the vibration signal of the bearing to be tested.

[0049] The rolling bearing testing method, wherein the vibration signal is a vibration signal based on the time domain; the test results include: a faulty bearing;

[0050] Obtaining a test result of the bearing to be tested based on the vibration signal of the target bearing and the vibration signal of the bearing to be tested includes:

[0051] Performing Fourier transform on the vibration signal of the target bearing to obtain a frequency-domain vibration signal of the target bearing, and performing Fourier transform on the vibration signal of the bearing to be tested to obtain a frequency-domain vibration signal of the bearing to be tested;

[0052] At the same frequency, the target amplitude of the frequency-domain-based vibration signal of the target bearing and the measured amplitude of the frequency-domain-based vibration signal of the bearing to be tested are compared. When the difference between the target amplitude and the measured amplitude is greater than a preset threshold, the bearing to be tested is a faulty bearing.

[0053] The rolling bearing testing method further comprises:

[0054] The outer ring of the bearing to be tested is rotated, and the vibration exciter is continuously controlled to generate vibration, and the vibration is applied to the outer rings of the target bearing and the bearing to be tested by a telescopic loading frame until the outer ring of the bearing to be tested rotates one circle;

[0055] determining a maximum value of a difference between the target amplitude and the amplitude to be measured;

[0056] The fault position of the faulty bearing is determined according to the maximum value.

[0057] The rolling bearing testing method further comprises:

[0058] The fault cause of the faulty bearing is determined according to the frequency corresponding to the amplitude to be measured when the difference between the target amplitude and the amplitude to be measured is greater than a preset threshold.

[0059] Beneficial effect: In the present invention, the bearings on the first bearing seat and the bearings on the second bearing seat rotate under the drive of the same rotating main shaft and vibrate under the excitation of the same exciter. Even if there are random environmental factors during the experiment, they have basically the same impact on the two bearings. Therefore, the vibration signals of the two bearings can be collected and the impact of the random environmental factors can be offset by the vibration signals of the two bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a first stereoscopic view of the bidirectional dynamic loading device for rolling bearings in the present invention.

[0061] Figure 2 This is a second stereoscopic view of the bidirectional dynamic loading device for rolling bearings according to the present invention.

[0062] Figure 3 This is a first stereoscopic view of the telescopic loading frame of the present invention.

[0063] Figure 4 This is a second stereoscopic view of the telescopic loading frame of the present invention.

[0064] Figure 5 It is a flow chart of the testing method of rolling bearings in the present invention.

[0065] Figure 6 It is a spectrum of the vibration signal of the target bearing based on the time domain in the present invention.

[0066] Figure 7 It is a graph of the vibration signal of the bearing to be tested based on the time domain in the present invention.

[0067] Figure 8 It is a spectrum of the vibration signal of the target bearing based on the frequency domain in the present invention.

[0068] Figure 9 It is a spectrum of the vibration signal of the bearing to be tested based on the frequency domain in the present invention.

[0069] Description of reference numerals:

[0070] 10. Base; 11. Platform seat; 12. Vibration seat; 20. Driving member; 30. Rotating spindle; 31. First shoulder; 32. Second shoulder; 41. First bearing seat; 42. Second bearing seat; 50. Vibrator; 60. Telescopic loading frame; 61. Fixed fulcrum device; 62. First fixed rod; 63. Second fixed rod; 64. First telescopic rod; 641. First fixed part; 642. First telescopic part; 65. Second telescopic rod; 651. Second fixed part; 652. Second telescopic part; 66. Third telescopic rod; 661. Third telescopic part; 662. Third fixed part; 663. Fourth telescopic part; 67. Fixed frame; 671. Column; 672. Connecting rod; 68. Fourth telescopic rod; 681. Fifth telescopic part; 682. Fourth fixed part; 683. Sixth telescopic part; 69. Sleeve; 70. Brake. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solutions and advantages of the present invention more clear and distinct, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0072] Please also see Figures 1-4 The present invention provides some embodiments of a bidirectional dynamic loading device for a rolling bearing.

[0073] like Figures 1-2 As shown, the rolling bearing bidirectional dynamic loading device of the present invention includes:

[0074] Base 10;

[0075] A driving member 20 is provided on the base 10;

[0076] A rotating main shaft 30 connected to the output shaft of the driving member 20;

[0077] A first bearing seat 41 and a second bearing seat 42 are both provided on the base 10 and used for mounting bearings; the first bearing seat 41 and the second bearing seat 42 are provided along the axis of the rotating spindle 30;

[0078] The exciter 50 is provided on the base 10;

[0079] a telescopic loading frame 60 connected to the output shaft of the vibration exciter 50;

[0080] Wherein, the inner ring of the bearing is connected to the rotating main shaft 30;

[0081] The telescopic loading frame 60 abuts against the outer ring of the bearing on the first bearing seat 41 and the outer ring of the bearing on the second bearing seat 42 along the axial direction of the rotating main shaft 30 to load the vibration of the exciter 50 to the bearings.

[0082] It is worth noting that the base 10 refers to a device that supports other structures. The base 10 includes a platform seat 11 and an excitation seat 12. The driving member 20 refers to a device that drives the rotating spindle 30 to rotate, specifically driving the rotating spindle 30 to rotate with the axis as the rotation center. The driving member 20 is specifically arranged on the platform seat 11. The rotating spindle 30 refers to a rotating shaft-shaped device. The bearing seat refers to a device for installing bearings. The bearings can be rolling bearings. The exciter 50 refers to a device for generating an excitation force, specifically exciting the bearings so that the bearings obtain a certain form and size of vibration. It is specifically arranged on the excitation seat 12. The telescopic loading frame 60 refers to a device that transmits the excitation force of the exciter 50.

[0083] In the present invention, the bearing on the first bearing seat 41 and the bearing on the second bearing seat 42 rotate under the drive of the same rotating main shaft 30, and vibrate under the excitation of the same exciter 50. Even if there are random environmental factors during the experiment, they have basically the same impact on the two bearings. Therefore, the vibration signals of the two bearings can be collected and the impact of the random environmental factors can be offset by the vibration signals of the two bearings.

[0084] In the specific test bearing, a target bearing and a bearing to be tested can be respectively installed on the first bearing seat 41 and the second bearing seat 42, the target bearing is a bearing with normal performance and no failure, the target bearing and the bearing to be tested are driven to rotate and loaded with vibration, vibration signals of the target bearing and the bearing to be tested are collected, and then a test result of the bearing to be tested can be obtained according to the vibration signals of the target bearing and the bearing to be tested.

[0085] In a preferred implementation manner of the embodiment of the present application, as shown in Figures 2-4 The telescopic loading frame 60 is symmetrically arranged about the axis of the output shaft of the exciter 50.

[0086] The telescopic loading frame 60 comprises:

[0087] A fixed fulcrum device 61 is arranged on the base 10.

[0088] A first fixed rod 62 and a second fixed rod 63 are arranged on the side of the fixed fulcrum device 61 away from the rotating main shaft 30.

[0089] A first telescopic rod 64 and a second telescopic rod 65 are arranged on the side of the fixed fulcrum device 61 facing the rotating main shaft 30.

[0090] A third telescopic rod 66 is connected with the end of the first telescopic rod 64 and the end of the second telescopic rod 65, and the two ends of the third telescopic rod 66 are respectively in abutment with the outer ring of the upper bearing of the first bearing seat 41 and the outer ring of the upper bearing of the second bearing seat 42.

[0091] A fixed frame 67 is connected with the fixed fulcrum device 61 and the third telescopic rod 66 at two ends.

[0092] A fourth telescopic rod 68 is connected with the first fixed rod 62 and the second fixed rod 63 at two ends.

[0093] A sleeve 69 is connected with the fourth telescopic rod 68 and the output shaft of the exciter 50 at two ends.

[0094] The first fixed rod 62 and the second fixed rod 63 are symmetrically arranged about the axis of the output shaft of the exciter 50.

[0095] The first telescopic rod 64 and the second telescopic rod 65 are symmetrically arranged about the axis of the output shaft of the exciter 50.

[0096] Specifically, the fixed rod refers to a rod-shaped device that is fixedly set, and the telescopic rod refers to a rod-shaped device that is telescopic along the axis. The direction of the axis of the rotating main shaft 30 is the x-axis, and the direction perpendicular to the axis of the rotating main shaft 30 in the horizontal plane is the y-axis. The third telescopic rod 66 and the fourth telescopic rod 68 are parallel to the x-axis, the axis of the sleeve 69 is parallel to the y-axis, the axis of the sleeve 69 coincides with the axis of the output shaft of the vibrator 50, and the fixed fulcrum device 61 is located on the axis of the output shaft of the vibrator 50. Since the telescopic loading frame 60 is symmetrically arranged about the axis of the output shaft of the vibrator 50 and the position of the fixed fulcrum device 61 remains unchanged, the y-axis vibration output by the output shaft of the vibrator 50 is transmitted to the fourth telescopic rod 68, and respectively passes through the first fixed rod 62 and the second fixed rod 63, and is transmitted to the first telescopic rod 64 and the second telescopic rod 65, and is transmitted to the third telescopic rod 66 to convert it into ±x-axis vibration, and finally transmitted to the two bearings.

[0097] Specifically, to facilitate vibration transmission, the axis of the first fixed rod 62 coincides with the axis of the second telescopic rod 65, and the axis of the second fixed rod 63 coincides with the axis of the first telescopic rod 64. Furthermore, the length of the first fixed rod 62 and the first telescopic rod 64 can be adjusted using the principle of leverage (of course, the lengths of the second fixed rod 63 and the second telescopic rod 65 are also adjusted accordingly).

[0098] In a preferred implementation of the embodiment of the present invention, Figures 3-4 As shown, the fixing frame 67 includes:

[0099] The column 671 and the connecting rod 672 are connected to each other, the column 671 is set on the third telescopic rod 66, and the two ends of the connecting rod 672 are respectively connected to the column 671 and the fixed support device 61.

[0100] Specifically, the axis of the upright 671 is perpendicular to the x-axis and the y-axis, and the axis of the connecting rod 672 is parallel to the y-axis. In other words, the fixing bracket 67 is also symmetrically arranged about the axis of the output shaft of the exciter 50. The fixing bracket 67 ensures that the position of the third telescopic rod 66 on the y-axis remains unchanged.

[0101] In a preferred implementation of the embodiment of the present invention, Figures 2-4 As shown, the first telescopic rod 64 includes:

[0102] A first fixed portion 641 and a first telescopic portion 642 connected to each other, wherein an end portion of the first fixed portion 641 is connected to the fixed fulcrum device 61;

[0103] The second telescopic rod 65 includes:

[0104] A second fixed portion 651 and a second telescopic portion 652 are connected to each other, and an end portion of the second fixed portion 651 is connected to the fixed fulcrum device 61;

[0105] The third telescopic rod 66 includes:

[0106] The third telescopic portion 661, the third fixed portion 662 and the fourth telescopic portion 663 are connected in sequence;

[0107] The third telescopic portion 661 is connected to the end of the first telescopic portion 642;

[0108] The fourth telescopic portion 663 is connected to the end of the second telescopic portion 652;

[0109] An end portion of the fixing bracket 67 is connected to the third fixing portion 662 .

[0110] Specifically, to facilitate vibration transmission, the end of the first fixing portion 641 of the first telescopic rod 64 is connected to the fixed fulcrum device 61 , and the end of the second fixing portion 651 of the second telescopic rod 65 is connected to the fixed fulcrum device 61 .

[0111] In a preferred implementation of the embodiment of the present invention, Figures 2-4 As shown, the fourth telescopic rod 68 includes:

[0112] The fifth telescopic portion 681, the fourth fixed portion 682 and the sixth telescopic portion 683 are connected in sequence;

[0113] The end of the fifth telescopic portion 681 is connected to the first fixing rod 62;

[0114] The end of the sixth telescopic portion 683 is connected to the second fixing rod 63;

[0115] An end portion of the sleeve 69 is connected to the fourth fixing portion 682 .

[0116] Specifically, in order to facilitate the vibration transmission of the exciter 50, the end of the sleeve 69 is connected to the fourth fixed part 682. When the exciter 50 is started, the fourth fixed part 682 moves, and the lengths of the fifth telescopic part 681 and the sixth telescopic part 683 change. The angle between the first fixed rod 62 and the fifth telescopic part 681 changes, the angle between the second fixed rod 63 and the sixth telescopic part 683 changes, the angle between the first fixed rod 62 and the second fixed rod 63 changes, the angle between the first telescopic rod 64 and the second telescopic rod 65 changes accordingly, and the length of the first telescopic rod 64 and the length of the second telescopic rod 65 also changes, the angle between the first telescopic part 642 and the third telescopic part 661 changes, and the angle between the second telescopic part 652 and the fourth telescopic part 663 changes, thereby causing the third telescopic part 661 and the fourth telescopic part 663 to move along the +x axis and -x axis directions, respectively.

[0117] In a preferred implementation of the embodiment of the present invention,Figures 1-2 As shown in the figure, the rolling bearing bidirectional dynamic loading device further comprises:

[0118] A brake 70 is arranged at the end of the rotating main shaft 30 away from the driving member 20, and is used to stop the rotation of the rotating main shaft 30.

[0119] Specifically, in order to stop the rotation of the rotating main shaft 30, the brake 70 is arranged at the end of the rotating main shaft 30 away from the driving member 20, so that the rotation of the rotating main shaft 30 can be quickly stopped.

[0120] In a preferred implementation manner of the embodiment of the present application, as shown in the figure, Figures 1-2 Specifically, the brake 70 is a magnetic powder brake. Specifically, the magnetic powder brake can be used as needed.

[0121] In a preferred implementation manner of the embodiment of the present application, as shown in the figure, Figures 1-2 The rotating main shaft 30 is provided with a first shaft shoulder 31 and a second shaft shoulder 32, and the first bearing seat 41 and the second bearing seat 42 are located between the first shaft shoulder 31 and the second shaft shoulder 32. The bearing on the first bearing seat 41 is mounted on the first shaft shoulder 31, and the bearing on the second bearing seat 42 is mounted on the second shaft shoulder 32.

[0122] It should be noted that when the bearing is installed, the inner ring of the bearing can be installed, or the outer ring of the bearing can be installed. When the outer ring of the bearing needs to be tested, the inner ring of the bearing is installed on the shaft shoulder. When the inner ring of the bearing needs to be tested, the outer ring of the bearing is installed on the shaft shoulder.

[0123] In a preferred implementation manner of the embodiment of the present application, the first vibration sensor and the second vibration sensor are arranged on the first bearing seat 41 and the second bearing seat 42 respectively. The first vibration sensor detects the vibration signal of the bearing on the first bearing seat 41, and the second vibration sensor detects the vibration signal of the bearing on the second bearing seat 42.

[0124] The present application also provides a preferred embodiment of a rolling bearing testing method:

[0125] As shown in the figure, the rolling bearing testing method of the embodiment of the present application comprises the following steps: Figure 5

[0126] Step S100, the target bearing and the bearing to be tested are respectively installed on the first bearing seat and the second bearing seat.

[0127] ​Specifically, the target bearing refers to a normal, fault-free bearing, and the test bearing refers to the bearing to be tested. The target bearing is mounted in the first bearing seat, and its inner or outer ring is connected to the rotating main shaft, specifically, the first shaft shoulder. The test bearing is mounted in the second bearing seat, and its inner or outer ring is connected to the rotating main shaft, specifically, the second shaft shoulder. It should be noted that when the target bearing has its inner ring connected to the rotating main shaft, the test bearing also has its inner ring connected to the rotating main shaft. The following description uses the example of a rotating main shaft connecting the inner rings of the target bearing and the inner ring of the test bearing.

[0128] Step S200: Start the driving member to drive the rotating spindle to rotate, and drive the inner ring of the target bearing and the inner ring of the bearing to be tested to rotate.

[0129] Specifically, the driving member is started to drive the rotating main shaft to rotate, and drives the inner ring of the target bearing and the inner ring of the bearing to be tested to rotate, while the outer ring of the target bearing and the outer ring of the bearing to be tested do not rotate.

[0130] Step S300: Control the vibration exciter to generate vibration, and load the vibration to the outer ring of the target bearing and the outer ring of the bearing to be tested through a telescopic loading frame.

[0131] Specifically, the vibration exciter is started, and vibration is applied to the outer ring of the target bearing and the outer ring of the bearing to be tested through the telescopic loading frame, specifically applying vibration along the axial direction of the bearing.

[0132] Step S400: Acquire the vibration signal of the target bearing and the vibration signal of the bearing to be tested.

[0133] Specifically, when the inner ring of the target bearing and the inner ring of the bearing to be tested rotate and the outer rings of the target bearing and the outer rings of the bearing to be tested are subjected to vibration loading, a vibration signal of the outer ring of the target bearing and the outer ring of the bearing to be tested are obtained. Specifically, the vibration signal of the outer ring of the target bearing and the outer ring of the bearing to be tested can be collected using a vibration sensor.

[0134] It can be understood that when obtaining the vibration signal of the target bearing and the vibration signal of the bearing to be tested, the vibration signals are collected at the corresponding positions of the target bearing and the bearing to be tested. The position for collecting the vibration signal on the bearing to be tested can be one or more, and the average value of the vibration signals collected at multiple positions is used as the vibration signal of the bearing to be tested.

[0135] Step S500: Obtain a test result of the bearing to be tested according to the vibration signal of the target bearing and the vibration signal of the bearing to be tested.

[0136] Specifically, if the vibration signal of the target bearing is consistent with or similar to that of the bearing under test, the bearing under test is the same as the target bearing and is therefore normal and fault-free. If the vibration signal of the target bearing differs significantly from that of the bearing under test, the bearing under test is different from the target bearing and is therefore faulty.

[0137] The vibration signal is a vibration signal based on the time domain; the test result includes: a faulty bearing, and step S500 specifically includes:

[0138] Step S510: Perform Fourier transform on the vibration signal of the target bearing to obtain a frequency-domain-based vibration signal of the target bearing, and perform Fourier transform on the vibration signal of the bearing to be tested to obtain a frequency-domain-based vibration signal of the bearing to be tested.

[0139] Step S520: At the same frequency, compare the target amplitude of the frequency-domain-based vibration signal of the target bearing with the measured amplitude of the frequency-domain-based vibration signal of the bearing to be tested; when the difference between the target amplitude and the measured amplitude is greater than a preset threshold, the bearing to be tested is a faulty bearing.

[0140] Specifically, the vibration signals of the target bearing and the bearing under test are collected in the time domain. A Fourier transform is first performed on the time domain vibration signal to obtain a frequency domain vibration signal. The difference between the target amplitude and the measured amplitude of the frequency domain vibration signal at the same frequency is compared. If the difference is greater than a preset threshold, the bearing under test is faulty. If the difference is less than or equal to the preset threshold, the bearing under test is normal. The preset threshold can be set as needed.

[0141] Step S600: rotate the outer ring of the bearing to be tested, continue to control the exciter to generate vibration, and load the vibration to the outer ring of the target bearing and the outer ring of the bearing to be tested through the telescopic loading frame until the outer ring of the bearing to be tested rotates one circle.

[0142] Step S700: Determine the maximum value of the difference between the target amplitude and the amplitude to be measured.

[0143] Step S800: Determine the fault position of the faulty bearing according to the maximum value.

[0144] Specifically, the vibration signal of the bearing under test is collected at one or more locations. Different locations generate different vibration signals. To ensure accurate testing, the outer ring of the bearing under test needs to be rotated, and the collection location needs to be changed. Vibration signals from different locations are collected and compared. This not only comprehensively detects the bearing under test but also determines the fault location of the faulty bearing by maximizing the difference. Fault locations include inner ring faults, outer ring faults, and rolling element faults. Of course, the fault location can also be specifically determined at a specific location on the inner or outer ring.

[0145] Step S900: Determine the cause of the faulty bearing according to the frequency corresponding to the amplitude to be measured when the difference between the target amplitude and the amplitude to be measured is greater than a preset threshold.

[0146] Specifically, by analyzing the frequencies where the difference is greater than a preset threshold, the cause of the faulty bearing is determined. Fault causes include cracks, size mismatch, wear, etc. Specific embodiment 1

[0148] The speed of the driving part is 1797 rpm (clockwise rotation). The exciter can be a 4827 modal exciter with a rated thrust of up to 650N and a peak displacement of up to 50.8mm. The generated excitation wave is suitable for pulse, sine and random signals with a wide frequency range of 2-5000HZ.

[0149] The collected vibration signal can be Figure 6 and Figure 7 The vibration signal based on time domain of the target bearing is Figure 6 , the time domain-based vibration signal of the bearing to be tested is Figure 7 , after Fourier transform, the vibration signal based on the frequency domain is obtained. The vibration signal based on the frequency domain of the target bearing is Figure 8 , the vibration signal of the bearing to be tested based on the frequency domain is Figure 9 ,like Figure 8 and Figure 9 If the frequencies of the amplitudes are consistent, it means the bearing to be tested is normal and has no faults. If the frequencies of the amplitudes of the bearing to be tested and the normal bearing are different, it means the bearing to be tested has faults. Figure 8 、 Figure 9 It can be seen that Figure 9 There are frequencies around 550HZ and 700HZ Figure 8 If the vibration amplitude does not exist, the bearing to be tested is faulty.

[0150] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A bidirectional dynamic loading device for rolling bearings, characterized in that: include: base; A driving member, disposed on the base; a rotating spindle connected to the output shaft of the driving member; A first bearing seat and a second bearing seat are both arranged on the base and used to install bearings; the first bearing seat and the second bearing seat are arranged along the axis direction of the rotating main shaft; an exciter, disposed on the base; a telescopic loading frame connected to the output shaft of the vibrator; Wherein, the inner ring of the bearing is connected to the rotating main shaft; The telescopic loading frame abuts against the outer ring of the bearing on the first bearing seat and the outer ring of the bearing on the second bearing seat respectively along the axial direction of the rotating main shaft to load the vibration of the exciter to the bearings; A first vibration sensor and a second vibration sensor are respectively provided on the first bearing seat and the second bearing seat, wherein the first vibration sensor detects a vibration signal of the bearing on the first bearing seat, and the second vibration sensor detects a vibration signal of the bearing on the second bearing seat; The telescopic loading frame is symmetrically arranged about the axis of the output shaft of the exciter; The telescopic loading frame comprises: A fixed fulcrum device, arranged on the base; A first fixing rod and a second fixing rod are arranged on a side of the fixed fulcrum device away from the rotating main axis; A first telescopic rod and a second telescopic rod are arranged on a side of the fixed fulcrum device facing the rotating main shaft; a third telescopic rod, wherein an end portion of the first telescopic rod and an end portion of the second telescopic rod are both connected to the third telescopic rod, and two ends of the third telescopic rod are respectively in contact with an outer ring of a bearing on the first bearing seat and an outer ring of a bearing on the second bearing seat; A fixed frame, with two ends respectively connected to the fixed fulcrum device and the third telescopic rod; a fourth telescopic rod, having two ends connected to the first fixed rod and the second fixed rod respectively; a sleeve, both ends of which are connected to the fourth telescopic rod and the output shaft of the exciter respectively; Wherein, the first fixing rod and the second fixing rod are symmetrically arranged with respect to the axis of the output shaft of the exciter; The first telescopic rod and the second telescopic rod are symmetrically arranged about the axis of the output shaft of the exciter; The first telescopic rod comprises: a first telescopic portion and a first fixed portion connected to each other, wherein an end portion of the first fixed portion is connected to the fixed fulcrum device; The second telescopic rod comprises: a second telescopic portion and a second fixed portion connected to each other, wherein an end portion of the second fixed portion is connected to the fixed fulcrum device; The third telescopic rod comprises: A third telescopic portion, a third fixed portion, and a fourth telescopic portion connected in sequence; Wherein, the third telescopic portion is connected to the end of the first telescopic portion; The fourth telescopic portion is connected to the end of the second telescopic portion; The end of the fixing frame is connected to the third fixing portion; The fourth telescopic rod comprises: a fifth telescopic portion, a fourth fixed portion, and a sixth telescopic portion connected in sequence; Wherein, the end portion of the fifth telescopic portion is connected to the first fixing rod; The end of the sixth telescopic portion is connected to the second fixing rod; An end portion of the sleeve is connected to the fourth fixing portion.

2. The rolling bearing bidirectional dynamic loading device according to claim 1, characterized in that: The rolling bearing bidirectional dynamic loading device further comprises: The brake is arranged at one end of the rotating main shaft away from the driving member and is used to stop the rotation of the rotating main shaft.

3. The rolling bearing bidirectional dynamic loading device according to claim 2, characterized in that: The brake is a magnetic powder brake.

4. A method for testing a rolling bearing, characterized in that: Applied to the rolling bearing bidirectional dynamic loading device according to any one of claims 1 to 3, the testing method comprises the steps of: Install the target bearing and the bearing to be tested on the first bearing seat and the second bearing seat respectively; Starting the driving member to drive the rotating main shaft to rotate, and driving the inner ring of the target bearing and the inner ring of the bearing to be tested to rotate; Controlling the vibration exciter to generate vibration, and applying the vibration to the outer ring of the target bearing and the outer ring of the bearing to be tested through a telescopic loading frame; Acquiring a vibration signal of the target bearing and a vibration signal of the bearing to be tested; A test result of the bearing to be tested is obtained according to the vibration signal of the target bearing and the vibration signal of the bearing to be tested.

5. The rolling bearing testing method according to claim 4, characterized in that: The vibration signal is a vibration signal based on the time domain; the test results include: faulty bearing; Obtaining a test result of the bearing to be tested based on the vibration signal of the target bearing and the vibration signal of the bearing to be tested includes: Performing Fourier transform on the vibration signal of the target bearing to obtain a frequency-domain vibration signal of the target bearing, and performing Fourier transform on the vibration signal of the bearing to be tested to obtain a frequency-domain vibration signal of the bearing to be tested; At the same frequency, the target amplitude of the frequency-domain-based vibration signal of the target bearing and the measured amplitude of the frequency-domain-based vibration signal of the bearing to be tested are compared. When the difference between the target amplitude and the measured amplitude is greater than a preset threshold, the bearing to be tested is a faulty bearing.

6. The rolling bearing testing method according to claim 5, characterized in that: The test method further comprises: The outer ring of the bearing to be tested is rotated, and the vibration exciter is continuously controlled to generate vibration, and the vibration is applied to the outer rings of the target bearing and the bearing to be tested by a telescopic loading frame until the outer ring of the bearing to be tested rotates one circle; determining a maximum value of a difference between the target amplitude and the amplitude to be measured; The fault position of the faulty bearing is determined according to the maximum value.

7. The rolling bearing testing method according to claim 6, characterized in that: The test method further comprises: The fault cause of the faulty bearing is determined according to the frequency corresponding to the amplitude to be measured when the difference between the target amplitude and the amplitude to be measured is greater than a preset threshold.

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