An embedded large pipe diameter oil particle detection device and a detection method thereof

Abstract

The application relates to the technical field of large-pipe-diameter oil metal abrasive particle detection, and discloses an embedded large-pipe-diameter oil abrasive particle detection device, which comprises a detection unit and a circuit unit. The detection unit comprises an embedded pipe and a coil assembly arranged on the embedded pipe. The coil assembly comprises a planar coil and a detection coil. The planar coil is horizontally arranged in the middle part of the inner cavity of the embedded pipe, and the detection coil is wound on the outer sidewall of the embedded pipe. The circuit unit is connected with the coil assembly and comprises a signal generation circuit and a signal acquisition circuit. The signal generation circuit generates two-way output. One-way output is connected with the input end of the planar coil, and the input end of the signal acquisition circuit is connected with the detection coil. The application can realize the detection of metal abrasive particles under the condition of a 30mm large-pipe-diameter, and has high accuracy. Furthermore, the detection device has simple structure and is convenient to install in the oil pipeline.

Description

Technical Field

[0001] This invention relates to the field of large-diameter oil abrasive particle detection technology, and in particular to an embedded large-diameter oil abrasive particle detection device and its detection method. Background Technology

[0002] In actual working conditions, condition monitoring of high-speed rotating and reciprocating motion components in mechanical equipment is particularly important. Their high-speed cyclic motion characteristics make parts more prone to wear. These components are typically lubricated with oil, and the metal debris generated during wear circulates through the lubrication system. Therefore, monitoring the size and content of metal particles in the oil system can accurately determine and predict the health status of the mechanical equipment. This is a crucial basis for assessing equipment service status and diagnosing the root cause of faults. By identifying the material of the abrasive particles, the location of damaged parts can be pinpointed, reducing the difficulty of equipment maintenance. Just as blood tests aid in diagnosing diseases, analyzing metal particles in the oil can diagnose and predict potential mechanical failures, improving the real-time nature of equipment condition monitoring, avoiding economic losses due to downtime for inspection, and enhancing the reliability of long-term mechanical operation.

[0003] Currently, the most mature inductive oil detection devices both domestically and internationally typically employ a two-coil or three-coil structure. These structures generally detect flow channels with a diameter of around 10mm, which is often insufficient for monitoring high-flow, large-diameter oil lines. Some equipment is bulky, requiring a correspondingly larger volume of lubricating oil. Therefore, in recent years, there has been an urgent need to detect oil lines with diameters exceeding 10mm to improve the accuracy of equipment health monitoring and promptly identify potential faults. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above-mentioned large-diameter oil metal abrasive detection devices, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide an embedded large-diameter oil wear detection device, which aims to solve the problems of complex structure, difficult installation, and inaccurate detection of existing wear detection equipment in large-diameter oil pipelines.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an embedded large-diameter oil abrasive detection device, which includes a detection unit and a circuit unit. The detection unit includes an embedded tube and a coil assembly disposed on the embedded tube. The coil assembly includes a planar coil and a detection coil. The planar coil is placed flat in the middle of the inner cavity of the embedded tube, and the detection coil is wound on the outer wall of the embedded tube. The circuit unit is connected to the coil assembly and includes a signal generation circuit and a signal acquisition circuit. The signal generation circuit generates two outputs, one of which is connected to the input terminal of the planar coil, and the input terminal of the signal acquisition circuit is connected to the detection coil.

[0008] As a preferred embodiment of the embedded large-diameter oil abrasive detection device of the present invention, wherein: a coil platform is provided in the inner cavity of the embedded tube, and the plane of the coil platform passes through the central axis of the inner tube; the planar coil is placed in the coil platform; symmetrically arranged parallel convex rings are arranged on the outer side wall of the embedded tube, and the detection coil is distributed between the two convex rings.

[0009] As a preferred embodiment of the embedded large-diameter oil wear particle detection device of the present invention, the signal acquisition circuit includes an instrumentation amplifier, a multiplier, and at least three operational amplifiers. The output terminal of the instrumentation amplifier is connected to the input terminal of the multiplier, and the output terminal of the multiplier is connected to the output terminal of the operational amplifier.

[0010] The other output of the signal generation circuit is connected to the signal input terminal of the multiplier.

[0011] As a preferred embodiment of the embedded large-diameter oil abrasive detection device of the present invention, it further includes: an installation pipe unit, comprising a first pipe section and a second pipe section, the first pipe section and the second pipe section being connected to each other and having an installation cavity, wherein the detection unit is installed in the installation cavity; and a connecting pipe unit, comprising a first connecting pipe and a second connecting pipe, each being connected to the access end of the first pipe section and the second pipe section, respectively.

[0012] As a preferred embodiment of the embedded large-diameter oil abrasive detection device of the present invention, the first section of the pipe and the second section of the pipe have the same structure; the first section of the pipe has a round pipe and a flange disposed at the end of the round pipe, and adjacent flanges are connected by bolts.

[0013] As a preferred embodiment of the embedded large-diameter oil abrasive detection device of the present invention, wherein: a semi-groove is formed on the side wall of the flange away from the round pipe, and the two semi-grooves can be combined and communicated to form the mounting cavity; a sealing gasket is provided between the end of the embedded pipe and the mounting cavity; and a wiring connection hole is formed on the radial side wall of the flange body.

[0014] As a preferred embodiment of the embedded large-diameter oil abrasive detection device of the present invention, wherein: mounting seats are symmetrically arranged on the side wall of the circular tube, an eccentric rod is rotatably arranged on the mounting seat, a mounting hole is opened between the mounting seat and the side wall of the circular tube, and a limit member is provided in the mounting hole; the mounting hole communicates with the inner cavity of the circular tube, and the rotation point of the eccentric rod is located on the axial extension line of the mounting hole.

[0015] In a preferred embodiment of the embedded large-diameter oil abrasive detection device of the present invention, the central diameter of the mounting hole is larger than the diameters at both ends; the limiting member includes a limiting post, a flange disposed on the side wall of the limiting post, and a limiting spring connected between the flange and the central side wall of the mounting hole; the axial length of the limiting post is greater than the axial length of the mounting hole, and an inclined surface is provided at the end of the limiting post away from the mounting base.

[0016] As a preferred embodiment of the embedded large-diameter oil abrasive detection device of the present invention, wherein: one end of the first connecting pipe and the second connecting pipe is connected to an external oil pipe, and the side wall of the other end is provided with an insertion groove; the inclined surface can be inserted into the insertion groove.

[0017] Another objective of this invention is to provide an embedded method for detecting metal abrasive particles in large-diameter oil pipes. The purpose of this method is to solve the problems of complex structure, difficult installation, and inaccurate detection of abrasive particles in existing large-diameter oil pipes and oil circuits by using the above-mentioned detection device.

[0018] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for detecting embedded large-diameter oil metal abrasive particles, which uses the above-mentioned embedded large-diameter oil abrasive particle detection device and further includes the following detection steps:

[0019] S1: Connect the mounting tube unit with the built-in detection unit into the oil pipe, and connect the coil assembly to the corresponding circuit unit;

[0020] S2: Power on the signal generation circuit initially and set the excitation signal and the corresponding demodulation signal;

[0021] S3: The area where the oil passes through the detection unit is monitored by the abrasive signal output by the signal acquisition circuit in the oscilloscope.

[0022] S4: By observing the magnitude and number of pulse waveform amplitudes in the abrasive grain signal, the size and number of abrasive grains can be determined.

[0023] The beneficial effects of this invention are:

[0024] This invention uses an embedded coil mounting structure to install the detection coil between the mounting pipes at the connection of two oil pipe sections, resulting in a simple structure; and the connecting pipes at both ends facilitate the connection between the external oil pipes and the mounting pipes.

[0025] The coil assembly is connected to the detection circuit, enabling the detection of 500µm metal particles in an oil path with a diameter of 30mm. Furthermore, a coherent demodulation scheme can be used to clearly and efficiently extract the oil abrasive signal. After subsequent filtering and amplification, an abrasive signal with a high signal-to-noise ratio can be obtained, significantly improving the accuracy of abrasive detection. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0027] Figure 1 This is a schematic diagram of the overall structure of the detection unit of the embedded large-diameter oil abrasive detection device of the present invention.

[0028] Figure 2 This is a schematic diagram of the radial planar structure of the embedded tube in the embedded large-diameter oil abrasive particle detection device of the present invention.

[0029] Figure 3 This is a three-dimensional cross-sectional view of the detection unit AA of the embedded large-diameter oil abrasive detection device of the present invention.

[0030] Figure 4 This is a schematic diagram of the signal generation circuit connection of the embedded large-diameter oil abrasive detection device of the present invention.

[0031] Figure 5 This is a schematic diagram of the signal acquisition circuit of the embedded large-diameter oil abrasive detection device of the present invention.

[0032] Figure 6 This is a schematic diagram of the signal acquisition circuit of the embedded large-diameter oil abrasive detection device of the present invention.

[0033] Figure 7 This is a curve showing the frequency response of the filtering module in the signal acquisition circuit of the embedded large-diameter oil abrasive detection device of the present invention.

[0034] Figure 8 This is a schematic diagram of the mounting pipe unit structure of the embedded large-diameter oil abrasive particle detection device of the present invention.

[0035] Figure 9 This is a schematic diagram of the connection structure between the mounting pipe unit and the detection unit of the embedded large-diameter oil abrasive detection device of the present invention.

[0036] Figure 10 This is a schematic diagram of the radial plane structure of the mounting pipe unit of the embedded large-diameter oil abrasive particle detection device of the present invention.

[0037] Figure 11 This is a schematic cross-sectional view of the mounting pipe unit BB of the embedded large-diameter oil abrasive detection device of the present invention.

[0038] Figure 12 This is a schematic diagram of the CC cross-sectional structure of the mounting pipe unit of the embedded large-diameter oil abrasive detection device of the present invention.

[0039] Figure 13 This is a schematic diagram of the mounting pipe unit, connecting pipe unit, and oil pipe connection structure of the embedded large-diameter oil abrasive detection device of the present invention.

[0040] Figure 14 This is a top-view DD cross-sectional view of the embedded large-diameter oil abrasive detection device of the present invention.

[0041] Figure 15 This is a schematic diagram of the state change structure of the eccentric rod and limiting component of the embedded large-diameter oil abrasive detection device of the present invention.

[0042] Figure 16 This is an oscilloscope signal waveform diagram when no abrasive particles enter the planar coil in this invention.

[0043] Figure 17 This is the oscilloscope signal waveform when ferromagnetic abrasive particles enter the planar coil in this invention.

[0044] Figure 18 This is the oscilloscope signal waveform when non-ferromagnetic abrasive particles enter the planar coil in this invention. Detailed Implementation

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0048] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0049] Example 1

[0050] Reference Figures 1-6 According to embodiment 11, the first embodiment of the present invention provides an embedded large-diameter oil abrasive detection device. This detection device includes a detection unit 100, a circuit unit 200, a mounting tube unit 300, and a connecting tube unit 400. The detection unit 100 is the core device for detecting abrasive particles in oil in this solution and is embedded in the mounting tube unit 300. It is connected to the circuit unit 200 and displays the detection process of abrasive particles in oil through the circuit structure. The mounting tube unit 300 is used for the installation and protection of the detection unit 100 and is connected to the connecting tube unit 400 to realize the rapid assembly between two oil pipe sections Y.

[0051] Specifically, the detection unit 100 includes an inner tube 101 and a coil assembly 102 disposed on the inner tube 101. The coil assembly 102 includes a planar coil 102a and a detection coil 102b. The planar coil 102a is placed flat in the middle of the inner cavity of the inner tube 101, and the detection coil 102b is wound on the outer wall of the inner tube 101.

[0052] Furthermore, a coil platform 101a is provided in the inner cavity of the embedded tube 101, and the plane of the coil platform 101a passes through the central axis of the embedded tube 101; a planar coil 102a is placed in the coil platform 101a; symmetrically arranged parallel convex rings 101b are provided on the outer side wall of the embedded tube 101, and the detection coil 102b is distributed between the two convex rings 101b.

[0053] The embedded tube 101 is used for mounting the coil assembly 102, that is, both the planar coil 102a and the detection coil 102b are mounted on the embedded tube 101. Correspondingly, the planar coil 102a is encapsulated in the coil platform 101a and is located in the middle of the cavity of the embedded tube 101. The coil platform 101a divides the cavity of the embedded tube 101 into two symmetrical parts. It should be noted that the coil platform 101a is made of non-magnetic material, specifically PLA (polylactic acid, a biodegradable material) 3D printed, to avoid interfering with the magnetic field generated by the planar coil 102a. In addition, the edges of the coil platform 101a have a streamlined design to reduce the impact on the flow of oil in the oil circuit.

[0054] Two convex rings 101b can be integrally formed on the outer wall of the inner tube 101, symmetrically arranged and parallel to each other at the axial center of the tube body. The two convex rings 101b are used to limit and protect the detection coil 102b, and the axial area where the detection coil 102b is wound is smaller than the radial area where the planar coil 102a is distributed. (See attached image) Figure 4 and 11 As shown in the diagram, the induction coil is made of three layers of 50 turns of enameled wire with a diameter of 0.2 mm.

[0055] Furthermore, under the action of the connected circuit, the planar coil 102a generates a magnetic field that fills the cavity at its location and can be symmetrically canceled out. Thus, when no abrasive particles pass through, the acquisition circuit receives a carrier signal with the same frequency as the excitation signal. After demodulation, the output is a noise signal with a very small peak-to-peak value. The detection coil 102b is used to be induced by the magnetic field of the planar coil 102a and outputs the signal fluctuation caused by the abrasive particles passing through the magnetic field.

[0056] The circuit unit 200 is connected to the coil assembly 102 and includes a signal generation circuit 201 and a signal acquisition circuit 202. The signal generation circuit 201 generates two outputs, one of which is connected to the input terminal of the planar coil 102a. The input terminal of the signal acquisition circuit 202 is connected to the detection coil 102b.

[0057] The signal acquisition circuit 202 includes an instrumentation amplifier 202a, a multiplier 202b, and at least three operational amplifiers 202c. The output terminal of the instrumentation amplifier 202a is connected to the input terminal of the multiplier 202b, and the output terminal of the multiplier 202b is connected to the output terminal of the operational amplifier 202c.

[0058] The other output of the signal generation circuit 201 is connected to the signal input terminal of the multiplier 202b.

[0059] Specifically, the signal generator in the signal generation circuit 201 generates an AC excitation signal. It generates two signals: one input is given to the planar coil 102a as the excitation signal, with a voltage amplitude of 10V; the other input is given to the multiplier 202b in the signal acquisition circuit 202 for demodulating the abrasive particle signal within the carrier signal, with a voltage amplitude of 1V. The signal generation circuit 201 used in this embodiment is shown in the attached figure. Figure 4 As shown in the image.

[0060] The signal acquisition circuit 202 amplifies the induced signal acquired by the detection coil 102b and demodulates the particle signal in the carrier signal, outputting it to the acquisition device for analysis. In this scheme, the acquisition device is an oscilloscope, which uses AC coupling mode to read the processed signal. Further, the signal acquisition circuit 202 used in this embodiment is shown in the attached figure. Figure 5 and 6 As shown in the diagram. Among them, the instrumentation amplifier 202a uses the AD620ANZ, which has extremely strong low-noise amplification capability for weak signals and a high common-mode rejection ratio to suppress common-mode signals; the multiplier 202b uses the AD835ANZ; and the operational amplifier 202c uses the OP37EP, which is connected in series in a 3-group configuration to achieve higher amplification gain.

[0061] Furthermore, in the signal acquisition circuit 202 used in this embodiment, the multiplier 202b is connected to the first and second operational amplifiers to form a coherent demodulation module for coherent demodulation of the signal, so that the abrasive signal is demodulated from the carrier signal generated by the excitation signal. Since coherent demodulation will cause the original signal to be attenuated by half and generate a high-frequency signal at the same time, the abrasive signal needs to be amplified after passing through the coherent demodulation module, and the generated high-frequency signal needs to be filtered out. That is, the attenuated abrasive signal is amplified by the third and fourth operational amplifiers, and the high-frequency signal is filtered out by the fifth operational amplifier.

[0062] In this circuit, the fifth operational amplifier forms a low-pass Butterworth filter with a band-stop frequency of 70kHz. Its filtering characteristics are shown in the attached figure. Figure 7 As shown in the diagram, the desired abrasive grain signal is obtained after filtering out high-frequency signals using a low-pass filter, and finally connected to an oscilloscope for display.

[0063] Example 2

[0064] Reference Figures 8-15This is the second embodiment of the present invention, which differs from the first embodiment in that it further includes: an installation pipe unit 300, including a first pipe section 301 and a second pipe section 302, which are connected to each other and are provided with an installation cavity M, in which the detection unit 100 is installed; and a connecting pipe unit 400, including a first connecting pipe 401 and a second connecting pipe 402, which are respectively connected to the access ends of the first pipe section 301 and the second pipe section 302.

[0065] The first section of pipe 301 and the second section of pipe 302 have the same structure; the first section of pipe 301 has a round pipe 301a and a flange 301b disposed at the end of the round pipe 301a, and adjacent flanges 301b are connected by bolts L.

[0066] Specifically, the mounting pipe unit 300 is composed of two sections of pipe. In this embodiment, the two sections (i.e., the first section 301 and the second section 302) have the same structure. Therefore, in the following description, only the structure of the first section 301 will be described in detail. Of course, the pipe sections can also be implemented using other different structural solutions, which can be modified and adapted according to the actual installation scenario. In this regard, no further explanation will be provided.

[0067] The first section of pipe 301 includes a round pipe 301a and a flange 301b. A through hole is provided on the side wall of the flange 301b. The flange positions of the two sections of pipe are connected by bolts L to realize the assembly of the pipe unit 300.

[0068] A half-groove 301b-1 is provided on the side wall of the flange 301b away from the round tube 301a. The two half-grooves 301b-1 can be combined and communicated to form an installation cavity M. A sealing gasket F is provided between the end of the inner tube 101 and the installation cavity M. A line connection hole 301b-2 is provided on the radial side wall of the flange 301b.

[0069] Furthermore, since the embedded tube 101 needs to be installed inside the mounting tube, a cavity, namely the mounting cavity M, needs to be opened inside the mounting tube. Therefore, a semi-groove 301b-1 is opened on the side wall of the end where the two flanges 301b contact. After the two tube sections are combined, they can form the mounting cavity M. It should be noted that the axial length of the mounting cavity M is slightly larger than the axial length of the embedded tube 101, so that sealing gaskets F can be placed at both ends of the embedded tube 101 during installation to prevent oil leakage. Furthermore, it is necessary to shield the magnetic field in this device from interference from external magnetic fields. Therefore, the tube sections, especially the flanges 301b, need to be made of materials that can shield electromagnetic fields, such as copper, aluminum, and steel. The wiring connection hole 301b-2 is used for the extension and connection of the wiring in the planar coil 102a and the detection coil 102b, that is, the connection with the signal generation circuit 201 and the signal acquisition circuit 202.

[0070] A mounting base 301a-1 is symmetrically arranged on the side wall of the circular tube 301a. An eccentric rod 301a-2 is rotatably mounted on the mounting base 301a-1. A mounting hole 301a-3 is opened between the mounting base 301a-1 and the side wall of the circular tube 301a. A limit member 301a-4 is provided in the mounting hole 301a-3. The mounting hole 301a-3 communicates with the inner cavity of the circular tube 301a, and the rotation point of the eccentric rod 301a-2 is located on the axial extension line of the mounting hole 301a-3.

[0071] The central diameter of the mounting hole 301a-3 is larger than the diameters at both ends; the limiting member 301a-4 includes a limiting post 301a-4a, a flange 301a-4b disposed on the side wall of the limiting post 301a-4a, and a limiting spring 301a-4c connected between the flange 301a-4b and the central side wall of the mounting hole 301a-3; the axial length of the limiting post 301a-4a is greater than the axial length of the mounting hole 301a-3, and an inclined surface X is provided at the end away from the mounting base 301a-1.

[0072] The round pipe 301a provides an interface for the insertion and installation of the connecting pipe unit 400. The end of the pipe away from the flange 301b has a groove S for insertion. It should be noted that when the first connecting pipe 401 or the second connecting pipe 402 is inserted, an elastic gasket T is placed at the insertion end of the connecting pipe to prevent oil leakage.

[0073] A limiting assembly for installation is symmetrically arranged on the outer wall of the circular tube 301a. The assembly includes a mounting base 301a-1, an eccentric rod 301a-2, a mounting hole 301a-3, and a limiting member 301a-4. The mounting base 301a-1 protrudes from the outer wall of the circular tube 301a, while the eccentric rod 301a-2 is hinged to the end of the mounting base 301a-1. The mounting base 301a-1 and the side wall of the circular tube 301a are connected through the mounting hole 301a-3, and the limiting member 301a-4 is placed inside the mounting hole 301a-3. The mounting base 301a-1 limits the installation position of the eccentric rod 301a-2. The eccentric rod 301a-2 is a lever structure used to push the movement of the limiting post 301a-4a in the limiting member 301a-4, thereby achieving the insertion and release effect with the connecting tube.

[0074] In the limiting component 301a-4, the limiting post 301a-4a penetrates the mounting hole 301a-3. Under the action of the limiting spring 301a-4c, one end of the limiting post 301a-4a is always in contact with the eccentric sidewall of the eccentric rod 301a-2, while the other end can extend into the cavity of the round tube 301a after compression. When the connecting tube is inserted, it can be inserted into the insertion groove C opened at the end of the connecting tube. The flange 301a-4b on the limiting post 301a-4a is always located in the middle area of ​​the mounting hole 301a-3, which is used to limit the range of motion of the limiting post 301a-4a.

[0075] One end of the first connecting pipe 401 and the second connecting pipe 402 is connected to the external oil pipe Y, and the other end has a plug-in groove C on its side wall; the inclined surface X can be inserted into the plug-in groove C.

[0076] The connecting pipe unit 400 is used to connect the oil pipe Y to the installation pipe unit 300. One end of the first connecting pipe 401 and the second connecting pipe 402 is connected to one end of the oil pipe Y using existing technology, while the other end is inserted into the limiting member 301a-4 on the side wall of the round pipe 301a via the insertion groove C. The purpose of setting the inclined surface X to cooperate with the insertion groove C is that by inserting the inclined surface X, the connecting pipe 401 can be moved, and the insertion can be limited.

[0077] Combined with appendix Figures 8-15 As shown, in the assembly process with the oil pipe Y, the detection unit 100 and the installation pipe unit 300 are installed first. The first section of pipe 301 and the second section of pipe 302 are separated. Then, sealing gaskets F are placed at both ends of the embedded pipe 101, which is equipped with the planar coil 102a and the detection coil 102b. The whole is then placed in the installation cavity M, and the two sections of pipe are combined and connected by bolts L.

[0078] Next, assemble the connecting pipes at both ends of the installation pipe. First, deflect the eccentric rod 301a-2 to minimize or eliminate the compression of the limiting post 301a-4a. Under the action of the limiting spring 301a-4c, the limiting post 301a-4a does not extend into the round tube 301a. Then, insert the plug end of the connecting pipe into the round tube 301a. After full insertion, deflect the eccentric rod 301a-2 again, causing the eccentric sidewall of the eccentric part of the eccentric rod 301a-2 to compress the end of the limiting post 301a-4a, causing the other end of the limiting post 301a-4a to extend into the round tube 301a and be inserted into the insertion groove C. When the eccentric rod 301a-2 deflects to its maximum angle and remains stable, the limiting post 301a-4a is stably locked, thus achieving a stable lock between the connecting pipe and the installation pipe.

[0079] Example 3

[0080] Reference Figures 1-18This is the first embodiment of the present invention, which provides a method for detecting embedded large-diameter oil abrasive particles. The method uses the detection device for detecting embedded large-diameter oil abrasive particles described in embodiments 1 and 2 above, and further includes the following detection steps:

[0081] S1: Connect the mounting pipe unit 300, which has a built-in detection unit 100, into the oil pipe Y, and connect the coil assembly 102 to the circuit unit 200 accordingly.

[0082] Specifically, this step is used to connect the detection device described in the above embodiments to the oil pipeline to be tested and to connect the detection circuit; the detailed assembly steps are described in the above embodiments and will not be repeated here.

[0083] S2: Power on the signal generation circuit 201 initially, and set the excitation signal and the corresponding demodulation signal; wherein, the set excitation signal includes the frequency and amplitude of the excitation signal.

[0084] S3: The oil passes through the area of ​​the detection unit 100 and the abrasive signal is output by the signal acquisition circuit 202 in the oscilloscope.

[0085] When this detection device is in operation, the embedded planar coil 102a will generate a left-right symmetrical alternating magnetic field in the cavity of the embedded tube 101, while the detection coil 102b on the outer wall of the embedded tube 101 will generate magnetic induction in the alternating magnetic field. The signal acquisition circuit 202 collects the changes in magnetic induction of the detection coil 102b and generates a wear particle signal carrying disturbance. The output terminal of the signal acquisition circuit 202 is connected to an oscilloscope to visually display the waveform changes of the carrier signal.

[0086] S4: By observing the magnitude and number of pulse waveform amplitudes in the abrasive grain signal, the size and number of abrasive grains can be determined.

[0087] Furthermore, when no abrasive particles pass through the detection unit 100 area in the oil circuit, the signal acquisition circuit 202 receives a carrier signal with the same frequency as the excitation signal. After demodulation, the output is a noise signal without disturbance, meaning the waveform of the noise signal is relatively uniform with no obvious fluctuations. When abrasive particles pass through the detection unit 100 area in the oil circuit, the abrasive particles cause a change in the magnetic field generated by the planar coil 102a. The detection coil 102b will sense a slight disturbance, causing the carrier signal to be amplified and demodulated by the signal acquisition circuit 202, resulting in a noise signal with amplitude fluctuations. It should be noted that the amplitude of this pulse disturbance can reflect the size of the abrasive particles, and its pulse characteristics can distinguish between ferromagnetic and non-ferromagnetic particles. These signals can directly reflect the wear condition of mechanical equipment parts and can indirectly assess the health status of the tested equipment and estimate its service life.

[0088] Implementation example:

[0089] Based on the above embodiment, an example is demonstrated. An experimental device is set up, and the selected oil pipe has an inner diameter of 30mm and an outer diameter of 34mm (much larger than the conventional small pipe diameter of 10mm). Before the test, 1000μm-100μm iron particles and 1000μm-400μm copper particles are prepared and labeled and sealed with heat shrink tubing; and connected to the oil circuit environment where the test is conducted.

[0090] Then, the waveform generated by the signal generator was adjusted to a 130kHz sine wave with the same frequency and phase. One path was amplified and connected to the excitation coil, while the other path was used as a reference signal for demodulation. At this time, it was observed that the detection device had no output signal when there were no abrasive particles. Due to the presence of electromagnetic waves and power frequency interference in the environment, the oscilloscope could sense a noise signal with an amplitude of about 320mV when there were no abrasive particles.

[0091] When an empty heat shrink tubing is passed through the testing device, the waveform on the oscilloscope shows no change, indicating that a single heat shrink tubing has no effect on the sensing of the testing device. (See attached image) Figure 16 As shown in the image.

[0092] The metal abrasive particles were then wrapped in heat-shrink tubing for testing. The waveform on the oscilloscope changed, reflecting the change in the induced signal when the abrasive particles passed through the detection device.

[0093] As attached Figure 17 As shown, the voltage signal amplitude Vpp induced by the detection device when a 200µm iron particle passes through is 720mV, the waveform is clearly visible, and the signal-to-noise ratio is high; the surface still has good particle resolution for ferromagnetic abrasive particles when the surface is 200µm in size. And as shown in the attached... Figure 18 As shown in the figure, when a 500µm copper particle passes through the detection device, a waveform with a Vpp of 400mV can be sensed, and the waveform change is still clearly visible.

[0094] Experiments have shown that this detection device can detect metal particles as small as 500 μm in an oil path with a diameter of 30 mm; and can clearly and efficiently extract the oil abrasive signal, which can be obtained after subsequent filtering and amplification to obtain an abrasive signal with a high signal-to-noise ratio.

[0095] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An embedded large-diameter oil abrasive particle detection device, characterized in that: include, The detection unit (100) includes an embedded tube (101) and a coil assembly (102) disposed on the embedded tube (101). The coil assembly (102) includes a planar coil (102a) and a detection coil (102b). The planar coil (102a) is placed flat in the middle of the inner cavity of the embedded tube (101), and the detection coil (102b) is wound on the outer wall of the embedded tube (101). The circuit unit (200), connected to the coil assembly (102), includes a signal generation circuit (201) and a signal acquisition circuit (202). The signal generation circuit (201) generates two outputs, one of which is connected to the input terminal of the planar coil (102a). The input terminal of the signal acquisition circuit (202) is connected to the detection coil (102b).

2. The embedded large-diameter oil abrasive particle detection device according to claim 1, characterized in that: A coil platform (101a) is provided in the inner cavity of the inner tube (101), and the plane of the coil platform (101a) passes through the central axis of the inner tube (101). The planar coil (102a) is placed in the coil platform (101a); The inner tube (101) has symmetrically arranged parallel convex rings (101b) on its outer side wall, and the detection coil (102b) is distributed between the two convex rings (101b).

3. The embedded large-diameter oil abrasive particle detection device according to claim 1 or 2, characterized in that: The signal acquisition circuit (202) includes an instrumentation amplifier (202a), a multiplier (202b), and at least three operational amplifiers (202c). The output terminal of the instrumentation amplifier (202a) is connected to the input terminal of the multiplier (202b), and the output terminal of the multiplier (202b) is connected to the output terminal of the operational amplifier (202c). Another output of the signal generation circuit (201) is connected to the signal input terminal of the multiplier (202b).

4. The embedded large-diameter oil abrasive particle detection device according to claim 2, characterized in that: It also includes, The mounting tube unit (300) includes a first tube section (301) and a second tube section (302), which are connected to each other and are provided with a mounting cavity (M). The detection unit (100) is installed in the mounting cavity (M). The connecting pipe unit (400) includes a first connecting pipe (401) and a second connecting pipe (402), which are respectively connected to the access ends of the first section pipe (301) and the second section pipe (302).

5. The embedded large-diameter oil abrasive particle detection device according to claim 4, characterized in that: The first tube section (301) and the second tube section (302) have the same structure; The first section of pipe (301) has a round pipe (301a) and a flange (301b) disposed at the end of the round pipe (301a), and adjacent flanges (301b) are connected by bolts (L).

6. The embedded large-diameter oil abrasive particle detection device according to claim 5, characterized in that: A half-groove (301b-1) is provided on the side wall of the flange (301b) away from the circular tube (301a). The two half-grooves (301b-1) can be combined and communicated to form the mounting cavity (M). A sealing gasket (F) is provided between the end of the inner tube (101) and the mounting cavity (M). The flange (301b) has a wiring connection hole (301b-2) on its radial side wall.

7. The embedded large-diameter oil abrasive particle detection device according to claim 6, characterized in that: A mounting base (301a-1) is symmetrically arranged on the side wall of the circular tube (301a). An eccentric rod (301a-2) is rotatably arranged on the mounting base (301a-1). A mounting hole (301a-3) is opened between the mounting base (301a-1) and the side wall of the circular tube (301a). A limiting member (301a-4) is provided in the mounting hole (301a-3). The mounting hole (301a-3) communicates with the inner cavity of the round tube (301a), and the rotation point of the eccentric rod (301a-2) is located on the axial extension line of the mounting hole (301a-3).

8. The embedded large-diameter oil abrasive particle detection device according to claim 7, characterized in that: The diameter of the middle hole of the mounting hole (301a-3) is larger than the diameters of its two ends; The limiting member (301a-4) includes a limiting post (301a-4a), a flange (301a-4b) disposed on the side wall of the limiting post (301a-4a), and a limiting spring (301a-4c) connected between the flange (301a-4b) and the middle side wall of the mounting hole (301a-3). The axial length of the limiting post (301a-4a) is greater than the axial length of the mounting hole (301a-3), and the end of the post away from the mounting base (301a-1) is provided with a bevel (X).

9. The embedded large-diameter oil abrasive particle detection device according to claim 8, characterized in that: One end of the first connecting pipe (401) and the second connecting pipe (402) is connected to an external oil pipe (Y), and the other end is provided with a plug-in inclined groove (C) on its side wall. The inclined surface (X) can be inserted into the insertion groove (C).

10. A method for detecting abrasive particles in embedded large-diameter oil pipes, characterized in that: The detection device for embedded large-diameter oil abrasive detection as described in claim 9 further includes the following detection steps: The mounting tube unit (300) with the built-in detection unit (100) is connected to the oil pipe (Y), and the coil assembly (102) is connected to the circuit unit (200). Power on the signal generation circuit (201) initially and set the excitation signal and the corresponding demodulation signal; The oil passes through the area of ​​the detection unit (100) and the abrasive signal is output by the signal acquisition circuit (202) in the observation oscilloscope. The size and number of abrasive particles can be determined by observing the amplitude and number of pulse waveforms in the abrasive particle signal.

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