Impedance-type abrasive material classification device and method

Abstract

The present invention provides an impedance-type abrasive material differentiation device and method. The device of the present invention comprises a sensing coil, a channel, an excitation unit, a detection unit and a data processing and analysis unit; the oil carrying metal abrasive particles is transported through the sensing coil through the channel; the excitation unit applies excitation to the coil, and the sensing coil generates a magnetic field around it; the detection unit detects the impedance change of the coil and obtains the impedance signal generated by the abrasive particles; the data processing and analysis unit analyzes the detected impedance signal to obtain the material and size of the abrasive particles. The method of the present invention analyzes the material and size of the metal abrasive particles through the characteristic curve of the relationship between the inductance resistance signal and the particle size of abrasive particles of different materials, thereby obtaining the wear parts of the mechanical equipment. The impedance-type abrasive material differentiation device and method provided by the present invention realizes the differentiation of the material of the metal abrasive particles, thereby obtaining more detailed status information of the mechanical equipment, which can be used for the diagnosis of the wear parts and wear degrees of the mechanical equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical fault diagnosis, and more specifically, to an impedance-type abrasive material differentiation device and method. Background Art

[0002] The materials used for the components of a mechanical system are different due to their different functions. Mechanical friction pairs will produce wear particles. By distinguishing the materials of the wear particles, the wear position can be located, providing important information for the condition monitoring and fault prediction of mechanical equipment.

[0003] At present, the main methods for distinguishing mechanical abrasive materials are spectral analysis and imaging. Spectral analysis distinguishes abrasive materials through atomic absorption or radiation spectra. Imaging method is to take pictures of abrasives through CCD image sensors, and then distinguish abrasive materials through image recognition algorithms. However, the detection devices based on spectral and imaging methods have high requirements for the detection environment and are greatly affected by the transmittance of oil. And because of the high precision of the device, the cost is high and the stability is low. Therefore, it is very important to develop a new method for distinguishing abrasive materials and a high-stability detection device. Summary of the invention

[0004] According to the above-mentioned technical problem of how to detect and distinguish the material of metal abrasive particles, an impedance-type abrasive material distinguishing device and method are provided. The present invention mainly uses the principle of electromagnetic induction. First, the oil carrying metal abrasive particles is transported through the channel through the sensing coil; then, the excitation unit applies excitation to the coil, and the sensing coil generates a magnetic field around it; then, the detection unit measures the change in the impedance of the coil to obtain the impedance signal generated by the abrasive particles; finally, the detected impedance signal is analyzed by the data processing and analysis unit to obtain the material and size of the abrasive particles.

[0005] The technical means adopted by the present invention are as follows:

[0006] An impedance-type abrasive material differentiation device comprises: a sensor coil, a channel, an excitation unit, a detection unit and a data processing and analysis unit; wherein:

[0007] The channel is closely attached to the surface of the sensing coil or passes through the inner hole of the sensing coil. The sensing coil is connected to the excitation unit and the detection unit. The data processing and analysis unit is connected to the detection unit.

[0008] Furthermore, the inner hole diameter of the sensing coil is 0.1 mm-10 mm, the number of turns is 5-2000, and it is used to generate an alternating electromagnetic field.

[0009] Furthermore, the channel is used to transport oil carrying metal abrasive particles through the sensor coil.

[0010] Furthermore, the excitation unit is used to apply alternating current excitation to the sensor coil.

[0011] Furthermore, the detection unit is used to detect the impedance change of the sensor coil and obtain the impedance signal generated by the abrasive particles.

[0012] Furthermore, the data processing and analysis unit is used to analyze the impedance signal obtained by the detection unit, and then obtain the material and size of the abrasive particles.

[0013] Furthermore, the data processing and analysis unit determines the material and size of the abrasive particles that generate the measured pulse signal through the characteristic curve of the relationship between the inductance resistance signal and the particle size of the abrasive particles of different materials.

[0014] The present invention also provides a method for distinguishing abrasive material based on the impedance-type abrasive material distinguishing device, comprising:

[0015] S1. Distinguishing the approximate properties of the wear particles to be detected according to the direction of the detected inductance signal;

[0016] S2. If the detected inductance pulse is positive, it is ferromagnetic abrasive particles; if the detected inductance pulse is negative, it is non-ferromagnetic abrasive particles;

[0017] S3. The material and size of the abrasive particles that generate the measured pulse signal are determined by using the characteristic curve of the relationship between the inductance resistance signal and the particle size of the abrasive particles of different materials.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The impedance-type abrasive material differentiation device and method provided by the present invention firstly transports the oil carrying metal abrasives through the channel through the sensing coil; then, the excitation unit applies excitation to the coil, and the sensing coil generates a magnetic field around it; then, the detection unit measures the change in the coil impedance to obtain the impedance signal generated by the abrasive; finally, the data processing and analysis unit analyzes the detected impedance signal to obtain the material and size of the abrasive.

[0020] 2. The impedance-type abrasive material differentiation device and method provided by the present invention realizes the differentiation of metal abrasive materials, thereby obtaining more detailed status information of mechanical equipment, which can be used for diagnosing the wear parts and wear degrees of mechanical equipment.

[0021] Based on the above reasons, the present invention can be widely promoted in the fields of mechanical fault diagnosis and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0024] Figure 2 The ferromagnetic abrasive particles and non-ferromagnetic abrasive particles provided in the embodiments of the present invention generate inductance pulse images in different directions.

[0025] Figure 3 The ferromagnetic abrasive particles and non-ferromagnetic abrasive particles provided in the embodiments of the present invention generate resistance pulse images in different directions.

[0026] Figure 4 The inductance-particle size signal characteristic curve diagram of the metal abrasive particles provided in the embodiment of the present invention under 2V, 2MHz AC excitation.

[0027] Figure 5 The resistance-particle size signal characteristic curve diagram of the metal abrasive particles provided in the embodiment of the present invention under 2V, 2MHz AC excitation.

[0028] In the figure: 1. sensor coil; 2. channel; 3. excitation unit; 4. detection unit; 5. data processing and analysis unit. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0033] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] like Figure 1 As shown, the present invention provides an impedance-type abrasive material differentiation device, comprising: a sensor coil 1, a channel 2, an excitation unit 3, a detection unit 4 and a data processing and analysis unit 5; wherein:

[0037] The channel 2 is closely attached to the surface of the sensing coil 1 or passes through the inner hole of the sensing coil 1 . The sensing coil 1 is connected to the excitation unit 3 and the detection unit 4 . The data processing and analysis unit 5 is connected to the detection unit 4 .

[0038] In specific implementation, as a preferred embodiment of the present invention, the inner diameter of the sensing coil 1 is 0.1mm-10mm, the number of turns is 5-2000, and it is used to generate an alternating electromagnetic field. The purpose of using this type of micro coil is to improve the uniformity of the magnetic field in the sensing area to ensure the stability of the detection result.

[0039] In a specific implementation, as a preferred embodiment of the present invention, the channel 2 is used to transport oil carrying metal abrasive particles through the sensor coil 1.

[0040] In specific implementation, as a preferred embodiment of the present invention, the excitation unit 3 is used to apply AC excitation to the sensor coil 1. In this embodiment, the excitation unit 3 applies 2V, 2MHz AC to the sensor coil 1;

[0041] In specific implementation, as a preferred embodiment of the present invention, the detection unit 4 is used to detect the impedance change of the sensor coil 1 and obtain the impedance signal generated by the abrasive particles.

[0042] In specific implementation, as a preferred embodiment of the present invention, the data processing and analysis unit 5 is used to analyze the impedance signal obtained by the detection unit 4, and then obtain the material and size of the abrasive particles. The data processing and analysis unit 5 determines the material and size of the abrasive particles that generate the measured pulse signal through the characteristic curve of the relationship between the inductance resistance signal and the particle size of abrasive particles of different materials. The magnetic permeability and electrical conductivity of different metals are significantly different, so the signal pulse values ​​generated by various metals are significantly different. According to this principle, the data processing and analysis unit 5 uses the inductance-particle size signal characteristics and resistance-particle size signal characteristics (inductance signal, resistance signal) of metal particles of different materials, and can distinguish metal materials (stainless steel, carbon steel, copper, aluminum, brass, aluminum alloy, etc.) through data comparison.

[0043] The working principle of the impedance-type abrasive material classification device provided by the present invention is as follows:

[0044] After the excitation unit 3 applies 2V, 2MHz AC to the sensing coil 1, an alternating electromagnetic field is generated around the sensing coil 1. When the metal abrasive particles pass through the sensing coil 1, they are affected by the magnetic field and produce magnetization effect and eddy current effect. The ferromagnetic metal abrasive particles will enhance the magnetic flux of the coil, thereby enhancing the inductance of the coil; the non-ferromagnetic metal abrasive particles will weaken the magnetic flux of the coil, thereby reducing the inductance of the coil; the metal abrasive particles will break the balance between the skin effect and the proximity effect of the coil, resulting in a change in the AC resistance of the coil.

[0045] The present invention also provides a method for distinguishing abrasive material based on the impedance-type abrasive material distinguishing device, comprising:

[0046] S1. Distinguishing the approximate properties of the wear particles to be detected according to the direction of the detected inductance signal;

[0047] S2. If the detected inductance pulse is positive, it is ferromagnetic abrasive particles; if the detected inductance pulse is negative, it is non-ferromagnetic abrasive particles;

[0048] S3. The material and size of the abrasive particles that generate the measured pulse signal are determined by using the characteristic curve of the relationship between the inductance resistance signal and the particle size of the abrasive particles of different materials.

[0049] Example

[0050] like Figure 2 , 3 As shown in the figure, ferromagnetic abrasive particles and non-ferromagnetic abrasive particles will generate inductance signal pulses and resistance signal pulses, and the signal amplitudes generated by metal abrasive particles of different materials with a diameter of 0.1 mm are different. Ferromagnetic abrasive particles generate positive inductance pulses and resistance pulses, and non-ferromagnetic abrasive particles generate negative inductance pulses and positive resistance pulses.

[0051] like Figure 4The figure shows the characteristic curve of inductance-particle size signal of metal abrasive particles of different materials under 2V, 2MHz AC excitation. Due to the difference in magnetic permeability and conductivity, the inductance pulse amplitude of abrasive particles of different materials has different trends with particle size.

[0052] like Figure 5 As shown, it is a characteristic curve of resistance-particle size signal of metal abrasive particles of different materials under 2V, 2MHz AC excitation. Due to the difference in magnetic permeability and conductivity, the resistance pulse amplitude of abrasive particles of different materials has different trends with particle size. Based on this, the data processing and analysis unit 5 can judge the size and material of the abrasive particles according to the detected inductance and resistance pulse signals.

[0053] For example, when the detection unit 4 detects an inductance signal of 2uH and a resistance signal of 3.8Ω, it can first be determined as ferromagnetic metal abrasive particles based on the inductance signal. Figure 4 In the example, based on the 2uH inductance signal, it can be determined to be 0.47mm carbon steel or 0.495mm stainless steel; Figure 5 In the figure, based on the 3.8Ω resistance signal, it can be judged that it is 0.47mm carbon steel or 0.69mm stainless steel; thus, it can be determined that the abrasive particles that generate 2uH inductance signal and 3.8Ω resistance signal are 0.47mm carbon steel.

[0054] For another example, when the detection unit 4 detects an inductance signal of -1uH and a resistance signal of 11.5Ω, it can first be determined as a non-ferromagnetic metal abrasive based on the inductance signal. Figure 4 In the example, based on the -1uH inductance signal, it can be determined to be 0.54mm copper or 0.635mm aluminum; Figure 5 In the figure, based on the 11.5Ω resistance signal, it can be judged to be 0.78mm copper or 0.635mm aluminum; thus, it can be determined that the abrasive particles that produce -1uH inductance signal and 11.5Ω resistance signal are 0.635mm aluminum.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An impedance-type abrasive material classification device, characterized in that: include: Sensing coil, channel, excitation unit, detection unit and data processing and analysis unit; wherein: The channel is closely attached to the surface of the sensing coil or passes through the inner hole of the sensing coil, the sensing coil is connected to the excitation unit and the detection unit, and the data processing and analysis unit is connected to the detection unit; The channel is used to transport the oil carrying the metal abrasive particles through the sensing coil; The inner hole diameter of the sensor coil is 0.1mm-10mm, the number of turns is 5-2000, and it is used to generate an alternating electromagnetic field; The excitation unit is used to apply alternating current excitation to the sensing coil; The detection unit is used to detect the impedance change of the sensor coil and obtain the impedance signal generated by the abrasive particles; The data processing and analysis unit is used to analyze the impedance signal obtained by the detection unit, and then obtain the material and size of the abrasive particles; The data processing and analysis unit determines the material and size of the abrasive particles that generate the measured pulse signal through the characteristic curve of the relationship between the inductance resistance signal and the particle size of the abrasive particles of different materials; Due to the difference in magnetic permeability and electrical conductivity, the resistance pulse amplitude of abrasive particles of different materials has different trends with particle size. After the excitation unit applies 2V, 2MHz AC to the sensor coil, an alternating electromagnetic field is generated around the sensor coil; when the metal abrasive particles pass through the sensor coil, they are affected by the magnetic field to produce magnetization effect and eddy current effect. The ferromagnetic metal abrasive particles enhance the magnetic flux of the coil, thereby enhancing the inductance of the coil; the non-ferromagnetic metal abrasive particles weaken the magnetic flux of the coil, thereby reducing the inductance of the coil; the metal abrasive particles break the balance between the skin effect and the proximity effect of the coil, resulting in a change in the AC resistance of the coil; The abrasive material distinguishing method based on the impedance-type abrasive material distinguishing device comprises: S1. Distinguishing the properties of the wear particles to be detected according to the direction of the detected inductance signal; S2. If the detected inductance pulse is positive, it is ferromagnetic abrasive particles; if the detected inductance pulse is negative, it is non-ferromagnetic abrasive particles; S3. The material and size of the abrasive particles that generate the measured pulse signal are determined by the characteristic curve of the relationship between the inductance resistance signal and the particle size of the abrasive particles of different materials. The magnetic permeability and electrical conductivity of different metals are significantly different, so the signal pulse values ​​generated by various metals are significantly different. Based on this principle, the inductance-particle size signal characteristics and resistance-particle size signal characteristics of metal particles of different materials are used to distinguish metal materials through data comparison.

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