Bearing ring grinding burn high-speed detection method and device

Abstract

The invention provides a bearing ring grinding burn high-speed detection method and device. The detection method comprises the following steps: exciting to generate a magnetic Barkhausen signal in a manner that a permanent magnet magnetizing device is fixed and a detected bearing ring rotates at a high speed relative to the magnetizing device; a magnetic domain in a magnetized area generates magnetic domain motion under the action of relative motion of a permanent magnet magnetic field, magnetic domain wall displacement generates a magnetic Barkhausen signal, and a receiving coil receives the magnetic Barkhausen signal. According to the detection method, the magnetic Barkhausen noise is excited through the high-speed rotation relative motion of the permanent magnet and the bearing ring, so that the process of generating a time-varying magnetic field through alternating current generated by a signal generator and a power amplifier is omitted; the defects that an existing instrument is low in grinding burn detection speed, and the problems of electromagnetic interference and heating are difficult to solve are overcome. In addition, the invention further provides a bearing ring grinding burn high-speed detection device based on permanent magnet excitation magnetic Barkhausen.

Description

Technical Field

[0001] The present invention relates to a high-speed detection method and device for grinding burns of bearing rings. Background Art

[0002] Grinding burns can lead to a reduction in the service performance of bearing rings. The magnetic Barkhausen method is an important method for detecting grinding burns of rings at present. The existing magnetic Barkhausen instruments on the market mainly use a time-varying magnetic field to excite the magnetic Barkhausen signal to detect grinding burns. The magnetic Barkhausen noise detection device generally consists of two parts: a magnetization unit and a signal receiving unit. The magnetization unit is made by winding a multi-turn coil on a magnetic yoke, and the signal receiving unit generally uses a highly sensitive coil. When the magnetic Barkhausen instrument works, a time-varying excitation signal (generally a sine wave waveform) is generated by a signal generator, amplified by a power amplifier, and then passed into the coil wound on the magnetic yoke, so that the magnetic yoke generates a magnetic field that changes with time, thereby magnetizing the workpiece to be detected and generating a magnetic Barkhausen signal. The signal receiving unit receives the magnetic Barkhausen signal, and judges whether grinding burns occur according to the root mean square of the received magnetic Barkhausen signal. Using this magnetization method requires a sufficiently large current to generate a sufficiently strong magnetic field, and the number of turns of the coil wound on the magnetic yoke also affects the magnitude of the magnetic field.

[0003] The existing magnetic Barkhausen detection methods generally use a time-varying magnetic field to excite the magnetic Barkhausen noise signal, which will cause problems such as heating of the excitation coil and electromagnetic interference. In addition, limited by the low excitation frequency (generally 0.1 - 200 Hz), the response speed of the time-varying magnetic field exciting the magnetic Barkhausen noise is slow, and there is a limitation of slow detection speed. Summary of the Invention

[0004] Based on this, a high-speed detection method and device for grinding burns of bearing rings are proposed. By the relative high-speed rotation of a permanent magnet and a bearing ring to excite the magnetic Barkhausen noise, the process of generating an alternating current through a signal generator and a power amplifier to generate a time-varying magnetic field is omitted, and the defects of slow detection speed, electromagnetic interference, and difficult-to-solve heating problems existing in current instruments are overcome.

[0005] In a first aspect, the present invention provides a high-speed detection method for grinding burns of bearing rings, by keeping the permanent magnet magnetization device stationary while the bearing ring to be detected rotates at a high speed relative to the permanent magnet magnetization device to excite and generate a magnetic Barkhausen signal; Within the magnetized region, magnetic domain motion is generated under the action of the relative motion of the magnetic field of the permanent magnet. The displacement of the magnetic domain walls generates the magneto Barkhausen signal. The receiving coil receives the magneto Barkhausen signal, which can be converted into a digital magneto Barkhausen signal through a signal amplifier and low-pass filtering and then by an acquisition card. By calculating the root mean square envelope of the digital magneto Barkhausen signal as the judgment condition for raceway burning, it is determined whether the bearing raceway has grinding burns by monitoring whether the ratio of the maximum value to the minimum value of the root mean square envelope of the digital magneto Barkhausen signal is within the set range.

[0006] Furthermore, using a permanent magnet magnetization device for fixation, the bearing raceway is rotated at a high speed relative to the permanent magnet magnetization device to generate the magneto Barkhausen signal, including the following steps: Step 1: The relative motion between the magnetic field of the permanent magnet and the raceway of the bearing raceway is realized by the way of the bearing rotating at a constant speed and the probe remaining stationary. The magnetic field of the permanent magnet interacts with the internal magnetic domains of the bearing raceway. Through the relative motion between the magnetic field of the permanent magnet and the raceway of the bearing raceway, Barkhausen jumps are induced through the perturbation of the interaction. The bearing rotating device includes two driving wheels and a driven wheel for assisting rotation. The two driving wheels rotate at a constant speed to drive the bearing raceway to rotate. The driven wheel has an elastic pressing structure, and the driven wheel can press the bearing raceway tightly to prevent the bearing raceway from shaking. When installing the bearing, the driven wheel is pulled apart, the bearing raceway is placed above the two driving wheels, and the driven wheel is released to ensure that the elastic pressing structure of the driven wheel is in a stretched state; Step 2: The probe for detection is a probe integrated with a permanent magnet yoke and a signal receiving coil. The signal receiving coil adopts a linear array coil to achieve full coverage scanning of the bearing raceway. The lower end surface of the bearing raceway and the lower surface of the lead foot of the permanent magnet yoke are in the same plane. There is an elastic pressing structure inside the probe, and the number of detection coils in the probe is not less than , rounded down, L is the width of the bearing raceway, is the outer diameter of the detection coil. Before detection, the probe is pressed tightly so that the wedge-shaped end of the probe is in a compressed state. The probe can realize two magnetization methods: circumferential local magnetization and axial local magnetization along the raceway; Step 3: The rotation angle of the driven wheel is detected by an encoder to control the sampling point distance interval to achieve equidistant sampling. The single sampling rotation angle is that the driven wheel rotates angle for one sampling. The sampling point distance interval is at most , is the outer diameter of the receiving coil, and the rotation angle of the driving wheel is , is the effective rotation radius of the driven wheel; Step 4: Use the ground and tempered burn bearing rings and the non-ground and non-burned bearing rings of the same size for comparison to determine the optimal rotational speed for the magnetic Barkhausen detection sensitivity. Take the maximum value of the root mean square envelope of the digital magnetic Barkhausen signal of the ground and tempered burn at the same rotational speed and the average value of the root mean square envelope of the digital magnetic Barkhausen signal of the non-ground and non-burned for the ratio as the basis for determining the magnetic Barkhausen detection sensitivity. By changing the rotational speed of the driving wheel, different ratios are obtained. The larger the ratio , the higher the magnetic Barkhausen detection sensitivity. Select the rotational speed corresponding to the maximum value of the ratio as the optimal rotational speed; Step 5: Pick up the magnetic Barkhausen signal through a coil placed in the middle of the yoke poles and perpendicular to the raceway of the bearing ring. The magnetic Barkhausen signal of the receiving coil can be collected by an analog signal acquisition card. The sampling frequency is higher than twice the highest frequency of the magnetic Barkhausen signal, and its sampling frequency preferably ranges from ; Step 6: Calculate the root mean square envelope of the magnetic Barkhausen signal. By calculating the root mean square of each sampling point and connecting the calculated root mean squares in sequence, the root mean square envelope of the magnetic Barkhausen signal is obtained. The maximum value and the minimum value of the root mean square envelope of the magnetic Barkhausen signal are the maximum and minimum values of the root mean square envelope corresponding to one rotation of the bearing. Determine whether there is a burn by the ratio of the maximum value to the minimum value of the root mean square envelope of one rotation of the bearing and the average value of the root mean square envelope. When both condition parameters are lower than the alarm threshold, the ring is judged as a qualified product; when any one of the condition parameters is higher than the alarm threshold, it is judged as a non-qualified product.

[0007] Furthermore, the signal detected by the magnetic Barkhausen signal for the bearing ring is a qualified sample detection signal with continuous and uniform noise. When the non-qualified ground and tempered burn sample rotates into and away from the magnetization area below the receiving coil in the burn area, the magnetic Barkhausen signal shows a trend of first increasing and then decreasing, and the ratio of the maximum value to the minimum value of the root mean square envelope of one rotation of the bearing increases; when the non-qualified quenched and tempered burn sample rotates into and away from the magnetization area below the receiving coil in the quenched burn area, the magnetic Barkhausen signal shows a trend of first decreasing and then increasing, and the ratio of the maximum value to the minimum value of the root mean square envelope of one rotation of the bearing decreases.

[0008] Second aspect, the present invention provides a detection device for a high-speed detection method of bearing ring grinding burn according to any one of the above, including a bearing rotation drive unit, a permanent magnet yoke excitation unit, a magnetic Barkhausen signal receiving unit, a magnetic Barkhausen signal acquisition unit, and a magnetic Barkhausen signal processing unit. The bearing rotation drive unit consists of a driving wheel and a driven wheel. The permanent magnet yoke excitation unit includes a single permanent magnet to provide an excitation magnetic field. The permanent magnet yoke excitation unit can be set to two detection modes: axial magnetization and circumferential magnetization. When axially magnetized, the connection line of the permanent magnet poles is parallel to the axial direction of the bearing ring. When circumferentially magnetized, the connection line of the permanent magnet poles is perpendicular to the axial direction of the bearing ring. The magnetic Barkhausen signal receiving unit is composed of a coil, and the axis of the coil is perpendicular to the bearing raceway. The magnetic Barkhausen signal processing unit includes a low-pass filter operational amplifier, which can filter out high-frequency noise interference signals. The magnetic Barkhausen signal acquisition unit converts the analog signal of the magnetic Barkhausen signal receiving unit into a digital signal through an analog signal acquisition card and a calculation algorithm of the root mean square envelope.

[0009] Compared with the prior art, the advantages of the present invention: The high-speed detection method and device for bearing ring grinding burn of the present invention use a single permanent magnet to provide an excitation magnetic field, utilize the interaction between the permanent magnet magnetic field and the internal magnetic domains of the raceway, and induce Barkhausen jumps through the perturbation of the interaction caused by the relative movement between the permanent magnet and the bearing ring raceway, eliminating the signal generator and power amplifier required for traditional time-varying magnetic field magnetization; realize the relative movement between the permanent magnet magnetic field probe and the bearing ring raceway by the way of the bearing rotating at a constant speed and the probe remaining stationary, and adjust the amplitude response sensitivity of the magnetic Barkhausen noise by controlling the bearing rotation speed; use the yoke structure to realize the local magnetization of the bearing ring raceway, and magnetize the bearing ring raceway in the axial or circumferential magnetization mode; use the coil placed in the middle of the yoke poles and perpendicular to the raceway to pick up the magnetic Barkhausen signal; use the root mean square envelope amplitude of the magnetic Barkhausen signal to identify the grinding burn of the raceway. When there is no grinding burn on the raceway, the magnetic Barkhausen envelope amplitude is a flat straight line; when there is a grinding burn on the raceway, the envelope amplitude of the magnetic Barkhausen signal changes suddenly at the position of the grinding burn.

[0010] The high-speed detection method and device for bearing ring grinding burn of the present invention use a single permanent magnet yoke excitation and a parallel arrangement of multiple detection coils to achieve full coverage detection of the raceway. Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of the detection device of the present invention; Figure 2 is a schematic diagram of the cooperation relationship between the permanent magnet yoke structure and the receiving coil of the present invention; Figure 3 Magnetic Barkhausen signal diagram without grinding burn for the present invention; Figure 4 Root mean square envelope diagram of the Magnetic Barkhausen signal of the raceway without grinding burn for the present invention; Figure 5 Magnetic Barkhausen signal diagram of tempering burn for the present invention; Figure 6 Root mean square envelope diagram of the Magnetic Barkhausen signal of the raceway with tempering burn for the present invention; Figure 7 Detection signal diagram of quenching burn for the present invention; Figure 8 Root mean square envelope diagram of the Magnetic Barkhausen signal of the raceway with quenching burn for the present invention; Figure 9 Schematic diagram of the detection system for the present invention; Figure 10 Circuit diagram of the low-pass filter amplifier for the present invention; In the figure: driving wheel 1, driven wheel 2, bearing raceway to be detected 3, permanent magnet yoke 4, spring pressing structure 5, signal receiving coil 6, bearing rotation driving unit 7, permanent magnet yoke excitation unit 8, Magnetic Barkhausen signal receiving unit 9, Magnetic Barkhausen signal processing unit 10, Magnetic Barkhausen signal acquisition unit 11. Specific implementation manner

[0012] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only one aspect of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the scope of protection of the present invention.

[0013] Please refer to Figures 1 - 10 , the present invention provides a high-speed detection method for grinding burn of bearing raceways. The detection method is to use a method in which the permanent magnet magnetization device is stationary and the bearing raceway 3 to be detected rotates at high speed relative to the magnetization device to excite the generation of Magnetic Barkhausen signals; Magnetic domains in the magnetization region generate magnetic domain motion under the action of the permanent magnet magnetic field. Among them, the displacement of magnetic domain walls generates Magnetic Barkhausen signals. The receiving coil receives the Magnetic Barkhausen signals, and after passing through a signal amplifier and low-pass filtering, they are converted into digital Magnetic Barkhausen signals by an acquisition card. Calculate the root mean square envelope of the digital Magnetic Barkhausen signals as the judgment condition for raceway burn. By monitoring whether the ratio of the maximum value to the minimum value of the root mean square envelope of the Magnetic Barkhausen signals is within the set range, it is judged whether the bearing raceway has grinding burn.

[0014] Furthermore, a method for detecting grinding burn using a permanent magnet to fix and a bearing race to rotate relative to a magnetization device at high speed to generate magnetic Barkhausen signals includes the following steps: Step 1: Use the method of the bearing rotating at a constant speed and the probe remaining stationary to achieve the relative movement between the permanent magnet magnetic field and the bearing raceway. Utilize the interaction between the permanent magnet magnetic field and the internal magnetic domains of the raceway. Through the disturbance of the interaction caused by the relative movement between the permanent magnet magnetic field and the bearing raceway, Barkhausen jumps are induced. The bearing rotating device includes two driving wheels 1 and an auxiliary rotating driven wheel 2. The bearing race is driven to rotate by the uniform rotation of the two driving wheels. The driven wheel is designed as an elastic pressing structure 5 for pressing the bearing race to prevent the race from shaking. When installing the bearing, the driven wheel needs to be pulled apart, the bearing race is placed above the two driving wheels, and the driven wheel is released to ensure that the elastic pressing structure 5 is in a stretched state; Step 2: The detection probe uses a permanent magnet yoke 4 and a signal receiving coil 6 as an integrated probe. The signal receiving coil uses a linear array coil to achieve full coverage scanning of the bearing race. The lower end surface of the coil is in the same plane as the lower surface of the yoke lead. There is an elastic pressing structure 5 designed inside the probe. The number of detection coils of the magnetic Barkhausen probe shall not be less than , and round down the result. L is the width of the bearing race, is the outer diameter of the detection coil. Before detection, press the detection probe to make the wedge-shaped end of the detection probe in a compressed state. This probe structure can achieve two magnetization methods: circumferential local magnetization and axial local magnetization along the raceway; Step 3: Control the sampling point distance interval by detecting the rotation angle of the driven wheel through an encoder to achieve equal-space sampling. The single sampling rotation angle is once every angle of the driven wheel rotation for sampling. The sampling point distance interval is at most half of the outer diameter of the receiving coil, that is , is the outer diameter of the receiving coil, then the corresponding rotation angle of the driving wheel is , is the effective rotation radius of the driven wheel; Step 4: Use grinding and tempering burned bearing races and non-grinding burned bearing races with the same size specifications as comparison specimens to determine the best magnetic Barkhausen detection sensitivity rotation speed. The maximum value of the root mean square envelope of the magnetic Barkhausen signals of the grinding burned ones at the same rotation speed and the average value of the root mean square envelope of the non-grinding burned ones The ratio is used as the basis for judging the magnetic Barkhausen detection sensitivity. By changing the rotation speed of the driving wheel, different ratios The ratio The larger the ratio, the higher the magnetic Barkhausen detection sensitivity. Select the rotation speed corresponding to the maximum value of the ratio as the best rotation speed; Step 5: Pick up the magnetic Barkhausen signals by using a coil placed in the middle of the yoke poles and perpendicular to the raceway of the ring. Use an analog signal acquisition card to collect the magnetic Barkhausen signals of the receiving coil. The sampling frequency should be higher than twice the highest frequency of the magnetic Barkhausen signals. Its sampling frequency preferably ranges from ; Step 6: Calculate the root mean square envelope of the magnetic Barkhausen noise signals. Calculate the root mean square of each sampling point, and connect the calculated root mean squares in sequence to obtain the root mean square envelope. The maximum value , minimum value of the root mean square envelope are the maximum and minimum values of the root mean square envelope corresponding to one rotation of the bearing. Determine whether there is burn by the two condition parameters of the ratio of the maximum value to the minimum value of the root mean square envelope and the average value of the root mean square envelope. When both condition parameters are lower than the alarm threshold, the ring is judged as a qualified product. When any one of the condition parameters is higher than the alarm threshold, it is judged as a non - qualified product.

[0015] Further, the signal characteristics of the permanent - magnet - excited magnetic Barkhausen detection of the bearing ring are as follows: for qualified sample detection signals, they are continuous and uniform noise signals; for unqualified re - fire - burned samples, during the process that the re - fire - burned area rotates into and away from the magnetization area below the receiving coil, the magnetic Barkhausen signals show a trend of first increasing and then decreasing, and the ratio of the maximum value to the minimum value of the single - turn root mean square envelope increases significantly; for unqualified quenching - burned samples, during the process that the quenching - burned area rotates into and away from the magnetization area below the receiving coil, the magnetic Barkhausen signals show a trend of first decreasing and then increasing, and the ratio of the maximum value to the minimum value of the root mean square envelope of one rotation of the bearing decreases.

[0016] In one of the embodiments, taking the axial magnetization method as an example, the method for detecting grinding burns of bearing rings based on magnetic Barkhausen of the present invention includes the following steps: Step 1: First, fix the bearing ring on the bearing rotation drive unit 7. Pull the driven wheel 2 vertically upward along the track, place the bearing ring vertically above the two driving wheels 1, make the outer surface of the bearing ring fit with the surface of the driving wheels 1, and release the driven wheel to ensure that the spring - pressing structure 5 is in a pressed state; Step 2: The inner diameter of the bearing ring , the width of the bearing ring , the outer diameter of the detection coil , and the rotation radii of the driving wheels and the driven wheel are all , then the single - sampling rotation angle can be obtained; Step 3: Determine the optimal sensitivity rotation speed by using a comparative test. Respectively, the rotation speeds of the driving wheels are , , , , For five groups of gradient rotational speed experiments, take the maximum value of the root mean square envelope of the magnetic Barkhausen signals of grinding burn in the five groups and the average value of the root mean square envelope without grinding burn The maximum value of the ratio The rotational speed of the driving wheel corresponding to is used as the rotational speed with the best magnetic Barkhausen detection sensitivity; Step 4: Place the detection probe vertically downward, with the detection surface of the probe perpendicular to the surface of the bearing race. Apply a downward pressure to the probe to keep the probe in a pressed state; Step 5: Power on the bearing rotation drive device and start the driving wheel. When the speed of the driving wheel is stable, the signal acquisition unit acquires the magnetic Barkhausen signal. When the driving wheel drives the bearing race to start uniform motion, the raceway of the bearing race is magnetized to generate a magnetic Barkhausen signal. The Barkhausen signal picked up by the receiving coil first passes through a signal amplifier and then through a low-pass filter and enters the acquisition card to obtain the magnetic Barkhausen signal waveform, as Figure 3 , Figure 5 and Figure 7 are respectively the magnetic Barkhausen signal waveforms of the unburned bearing race, the magnetic Barkhausen signal waveforms of the bearing race with tempering burn, and the magnetic Barkhausen signal waveforms of the bearing race with quenching burn. Finally, the data is processed by the magnetic Barkhausen signal processing unit to obtain the root mean square envelope, as Figure 4 , Figure 6 and Figure 8 are respectively the root mean square envelopes of the unburned bearing race, the root mean square envelopes of the bearing race with tempering burn, and the root mean square envelopes of the bearing race with quenching burn; Step 6: The magnetic Barkhausen signal processing unit calculates the ratio Max / Min of the maximum value Max to the minimum value Min of the root mean square envelope of the acquired magnetic Barkhausen signal and the mean value Avg of the envelope. If the Max / Min ratio is greater than the alarm threshold Thres1 or Avg is greater than the alarm threshold Thres2, it is an unqualified bearing, as Figure 3 shown by c, d, e, f in Figure 3 and Figure 4 are qualified bearings.

[0017] In a second aspect, the present invention provides a detection device for the high-speed detection method of bearing ring grinding burn as described above, including a bearing rotation drive unit 7, a permanent magnet yoke excitation unit 8, a magnetic Barkhausen signal receiving unit 9, a magnetic Barkhausen signal acquisition unit 11, and a magnetic Barkhausen signal processing unit 10. The bearing rotation drive unit consists of a driving wheel and a driven wheel, and its main function is to make the bearing ring rotate at high speed. The permanent magnet yoke excitation unit is composed of a single permanent magnet to provide an excitation magnetic field. The permanent magnet yoke excitation unit can be set to two detection modes: axial magnetization and circumferential magnetization. When axially magnetized, the connection line of the permanent magnet poles is parallel to the axial direction of the bearing ring; when circumferentially magnetized, the connection line of the permanent magnet poles is perpendicular to the axial direction of the bearing ring. The magnetic Barkhausen signal receiving unit is generally composed of coils, and the coil axis is perpendicular to the bearing raceway. The magnetic Barkhausen signal processing unit includes a low-pass filter operational amplifier, which mainly filters out high-frequency noise interference signals. The magnetic Barkhausen signal acquisition unit includes an analog signal acquisition card and a root mean square envelope calculation algorithm, which converts the analog signal received and processed by the magnetic Barkhausen signal into a digital signal.

[0018] Compared with the prior art, the advantages of the present invention are as follows: For the high-speed detection method and device of bearing ring grinding burn of the present invention, a single permanent magnet is used to provide an excitation magnetic field, and the interaction between the permanent magnet magnetic field and the internal magnetic domains of the raceway is utilized. The relative movement between the permanent magnet and the bearing ring raceway causes perturbations in the interaction to induce Barkhausen jumps, eliminating the signal generator and power amplifier required for traditional time-varying magnetic field magnetization; the relative movement between the permanent magnet magnetic field probe and the bearing ring raceway is realized by the way of the bearing rotating at a constant speed and the probe remaining stationary, and the amplitude response sensitivity of the magnetic Barkhausen noise is adjusted by controlling the rotation speed of the bearing; the local magnetization of the bearing ring raceway is realized by using a yoke structure, and the bearing ring raceway is magnetized in an axial or circumferential magnetization mode; the pickup of the magnetic Barkhausen signal is realized by using a coil placed in the middle of the yoke poles and perpendicular to the ring raceway; the identification of the grinding burn of the raceway is realized by using the root mean square envelope amplitude of the magnetic Barkhausen signal. When there is no grinding burn on the raceway, the magnetic Barkhausen envelope amplitude is a flat straight line; when there is a grinding burn on the raceway, the envelope amplitude of the magnetic Barkhausen signal changes suddenly at the position of the grinding burn.

[0019] For the high-speed detection method and device of bearing ring grinding burn of the present invention, a single permanent magnet yoke excitation and a parallel arrangement of multiple detection coils are adopted to achieve full coverage detection of the raceway.

[0020] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not limited to the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-speed detection method for grinding burns of bearing rings, characterized in that, By keeping the permanent magnet magnetization device stationary and rotating the bearing race to be detected at a high speed relative to the permanent magnet magnetization device, a magnetic Barkhausen signal is excited and generated; Magnetic domain movement occurs within the magnetization region due to the relative movement of the magnetic field of the permanent magnet, and magnetic domain wall displacement generates the magnetic Barkhausen signal. The receiving coil receives the magnetic Barkhausen signal, which can be converted into a digital magnetic Barkhausen signal through a signal amplifier and low-pass filter and then by a data acquisition card. By calculating the root mean square envelope of the digital magnetic Barkhausen signal as the determination condition for raceway burn, it is determined whether the bearing race has grinding burn by monitoring whether the ratio of the maximum value to the minimum value of the root mean square envelope of the digital magnetic Barkhausen signal is within the set range.

2. The high-speed detection method for bearing ring grinding burn according to claim 1, characterized in that Using the permanent magnet magnetization device fixed, rotating the bearing race at a high speed relative to the permanent magnet magnetization device to generate the magnetic Barkhausen signal, including the following steps: Step 1: Realize the relative movement between the magnetic field of the permanent magnet and the raceway of the bearing race by rotating the bearing at a constant speed and keeping the probe stationary. The magnetic field of the permanent magnet interacts with the internal magnetic domains of the bearing raceway. Through the relative movement between the magnetic field of the permanent magnet and the raceway of the bearing race, Barkhausen jumps are induced by the perturbation of the interaction. The bearing rotation device includes two driving wheels and a driven wheel for assisting rotation. The two driving wheels rotate at a constant speed to drive the bearing race to rotate. The driven wheel has a spring pressing structure, and the driven wheel can press the bearing race tightly to prevent the bearing race from shaking. When installing the bearing, the driven wheel needs to be pulled open, the bearing race is placed above the two driving wheels, and the driven wheel is released to ensure that the spring pressing structure of the driven wheel is in a stretched state; Step 2: The probe for detection is a probe integrated with a permanent magnet yoke and a signal receiving coil. The signal receiving coil adopts a linear array coil to achieve full coverage scanning of the bearing ring. The lower end surface of the bearing ring is in the same plane as the lower surface of the lead foot of the permanent magnet yoke. A spring pressing structure is provided inside the probe, and the number of detection coils of the probe shall not be less than , rounded down. L is the width of the bearing ring, is the outer diameter of the detection coil. Before detection, press the probe tightly so that the wedge-shaped end of the probe is in a compressed state. The probe can achieve two magnetization methods: circumferential local magnetization and axial local magnetization along the raceway; Step 3: Detect the rotation angle of the driven wheel through the encoder to control the sampling point distance interval, thereby achieving equidistant sampling. The single sampling rotation angle is degrees of rotation of the driven wheel for one sampling, and the sampling point distance interval is at most , is the outer diameter of the receiving coil, and the rotation angle of the driving wheel is , is the effective rotation radius of the driven wheel; Step 4: Use the ground and tempered burned bearing rings and the non-ground and burned bearing rings of the same size as a comparison to determine the optimal rotational speed for the magnetic Barkhausen detection sensitivity. Take the maximum value of the root mean square envelope of the digital magnetic Barkhausen signal of the ground and tempered burned bearing rings at the same rotational speed and the average value of the root mean square envelope of the digital magnetic Barkhausen signal of the non-ground and burned bearing rings for the ratio as the basis for determining the magnetic Barkhausen detection sensitivity. Obtain different ratios by changing the rotational speed of the driving wheel . The larger the ratio , the higher the magnetic Barkhausen detection sensitivity. Select the rotational speed corresponding to the maximum value of the ratio as the optimal rotational speed; Step 5: Pick up the magnetic Barkhausen signal through a coil placed in the middle of the yoke magnetic pole and perpendicular to the raceway of the bearing ring. The magnetic Barkhausen signal of the receiving coil can be collected by an analog signal acquisition card, and the sampling frequency is higher than twice the highest frequency of the magnetic Barkhausen signal. The sampling frequency preferably ranges from ; Step 6: Calculate the root mean square envelope of the magnetic Barkhausen signal. By calculating the root mean square of each sampling point , connecting the calculated root mean squares in sequence to obtain the root mean square envelope of the magnetic Barkhausen signal. The maximum value and minimum value of the root mean square envelope of the magnetic Barkhausen signal are the maximum and minimum values of the root mean square envelope corresponding to one rotation of the bearing. Determine whether there is burning by the ratio of the maximum value to the minimum value of the root mean square envelope of one rotation of the bearing and the average value of the root mean square envelope. When both condition parameters are lower than the alarm threshold, the raceway is judged as a qualified product; when any one of the condition parameters is higher than the alarm threshold, it is judged as a non - qualified product.

3. The high-speed detection method for bearing ring grinding burn according to claim 2, characterized in that The signal detected by the magnetic Barkhausen signal for the bearing race is a qualified sample detection signal, which is a continuous and uniform noise signal; during the process of the unqualified re-fire burn sample rotating to the magnetization region below the receiving coil and moving away, the magnetic Barkhausen signal shows a trend of first increasing and then decreasing, and the ratio of the maximum value to the minimum value of the root mean square envelope of a single rotation of the bearing increases; during the process of the unqualified quenching burn sample rotating to the magnetization region below the receiving coil and moving away, the magnetic Barkhausen signal shows a trend of first decreasing and then increasing, and the ratio of the maximum value to the minimum value of the root mean square envelope of a single rotation of the bearing decreases.

4. A detection device for the high-speed detection method of bearing ring grinding burn as described in any one of claims 1-3, characterized in that, It includes a bearing rotation drive unit, a permanent magnet yoke excitation unit, a magnetic Barkhausen signal receiving unit, a magnetic Barkhausen signal acquisition unit, and a magnetic Barkhausen signal processing unit. The bearing rotation drive unit consists of a driving wheel and a driven wheel. The permanent magnet yoke excitation unit includes a single permanent magnet to provide an excitation magnetic field. The permanent magnet yoke excitation unit can be set to two detection modes: axial magnetization and circumferential magnetization. When axially magnetized, the connection line of the permanent magnet poles is parallel to the axial direction of the bearing raceway. When circumferentially magnetized, the connection line of the permanent magnet poles is perpendicular to the axial direction of the bearing raceway. The magnetic Barkhausen signal receiving unit is composed of a coil, and the axis of the coil is perpendicular to the bearing raceway. The magnetic Barkhausen signal processing unit includes a low-pass filter operational amplifier, which can filter out high-frequency noise interference signals. The magnetic Barkhausen signal acquisition unit converts the analog signal of the magnetic Barkhausen signal receiving unit into a digital signal through an analog signal acquisition card and a calculation algorithm for the root mean square envelope line.

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