Device for rapidly measuring ferromagnetic wear particle content in used lubricating grease

Abstract

An apparatus for rapidly measuring the content of ferromagnetic wear particles in used lubricating grease includes a test mainframe. Inside the housing of the mainframe, there are a coil and a circuit module. The coil is connected to the input end of the circuit module, and the output end of the circuit module is connected to a display. A display and function keys are installed on the panel of the housing of the mainframe. A test port is provided on the housing of the mainframe, and the coil is provided around the test port. There is also a sampler that cooperates with the test port. The advantages of the present invention are: simple and compact structure, capable of sampling and measuring on-site, or measuring in a laboratory after sampling with the sampler, rapidly analyzing the sampled used lubricating grease, short time period, strong correspondence between the results and the spectrometry method, and suitable for on-site maintenance of equipment. Especially for the characteristics of high grease consistency, poor fluidity, and difficulty in extracting wear particles, there is no need to pretreat the sample, which is convenient, fast, and highly operable.

Description

Technical Field

[0001] The present invention relates to a device for quickly measuring the content of ferromagnetic wear particles in used lubricating grease, which is used to quickly detect the content of ferromagnetic wear particles in used lubricating grease, determine the wear state of equipment, and provide a reference for timely replacement or continued use of the grease. Background Art

[0002] Lubricating grease is called the "blood" of industrial equipment and plays roles such as reducing friction, anti-wear, cooling, and cleaning during the operation of equipment. The performance of lubricating grease plays an important role in the reliable operation of equipment. During the use of equipment, with the passage of time, due to external pollution, oxidation and degradation of the grease itself and other reasons, the performance of the grease deteriorates, resulting in equipment wear. By regularly sampling and detecting the used lubricating grease and wear particles, abnormal wear of the equipment can be detected in the early stage of equipment wear, and the lubricating grease can be replaced in time, which can avoid abnormal equipment failures, extend the service life, and ensure the reliable operation of the equipment.

[0003] When abnormal wear of equipment occurs, the metal on the surface of the friction pair enters the grease. Most of the friction pairs of equipment are made of metal, and the worn metal contains ferromagnetic particles. The analysis of worn metal particles in used lubricating grease generally adopts the method of digesting and other treatments on the sample after sampling, and testing by spectrometry. Spectrometry testing has high technical requirements on the one hand and a long cycle on the other hand.

[0004] In addition, Chinese patent document (CN107884450A) discloses a lubricating oil detection device, including an oil storage cylinder, an oscillation coil, a detection oscillator, a reference oscillator, a difference frequency digital segmenter, and a display alarm. On one side of the oil storage cylinder, an oil inlet pipe is connected. At the bottom end of the oil inlet pipe, an oil outlet pipe is connected. A connector is installed on the oil inlet pipe, and the connector is used to connect the oil inlet pipe and the first oil guide pipe. An oil extractor is installed on the oil guide pipe. One end of the oil extraction port of the oil extractor is connected with an oil extraction pipe, and the oil extraction pipe is used to extract lubricating oil from the tank; an oil temperature detector, a conductivity detector, a viscosity detector, and a concentration detector are arranged in the oil storage cylinder, and the oil temperature detector, the conductivity detector, the viscosity detector, and the concentration detector are all connected to a signal differentiator, the signal differentiator is connected to a signal processor, and the signal processor is connected to a display. This device also has the disadvantages of adopting the method of digesting and other treatments on the sample after sampling, being unable to quickly sample and measure on-site, and having a complex structure. Summary of the Invention

[0005] The present invention provides a device for quickly measuring the content of ferromagnetic wear particles in used lubricating grease to solve the above problems existing in the prior art.

[0006] The technical solution of the present invention is: A device for quickly measuring the content of ferromagnetic wear particles in used lubricating grease, including a test host. Inside the housing of the host, there is a coil and a circuit module. The coil is connected to the input end of the circuit module, and the output end of the circuit module is connected to a display. On the panel of the housing of the host, a display and function keys are installed. It is characterized in that a test port is provided on the housing of the host, and the coil is provided around the test port. There is also a sampler that cooperates with the test port. The sampler includes a sampling nozzle, a sampling piston, a sample storage tube, and a piston rod. The sampling nozzle is provided at the front end of the sample storage tube. The sampling piston is slidably installed in the sample storage tube. The front end of the piston rod is connected to the rear end of the sampling piston, and the rear end of the piston rod extends out of the rear end of the sample storage tube.

[0007] The advantages of the present invention are: The structure is simple and compact. It can take samples on-site for measurement, or it can be taken to the laboratory for measurement after sampling with the sampler. It can quickly analyze the samples of used lubricating grease. The time period is short, and the result has a strong correspondence with the spectrometry method, which is suitable for on-site maintenance of equipment. Especially for the characteristics of high grease consistency, poor fluidity, and difficulty in extracting wear particles, there is no need to pretreat the samples, which is convenient, fast, and highly operable. Description of the Drawings

[0008] Figure 1 is the overall external structure schematic diagram of the present invention;

[0009] Figure 2 is Figure 1 the internal structure schematic diagram of;

[0010] Figure 3 is Figure 1 the sectional structure schematic diagram of the sampler in;

[0011] Figure 4 is Figure 2 the composition schematic diagram of the circuit module in.

[0012] Description of the reference numerals: 1. Sampler, 11. Sampling nozzle, 12. Sampling piston, 13. Sample storage tube, 14. Piston rod, 15. Pull rod tube, 16. Pull rod, 17. Sleeve, 18. Positioning rod, 19. Positioning scale, 20. Positioning hole, 21. Through hole, 2. Host housing, 3. Test port, 4. Display, 5. Function keys (or knobs), 6. Coil, 7. Circuit module. Detailed Embodiment

[0013] See Figures 1-4, an apparatus for rapidly measuring the content of ferromagnetic wear particles in used lubricating grease according to the present invention includes a test mainframe. Inside the housing 2 of the mainframe, a coil 6 and a circuit module 7 are installed. The coil 6 is connected to the input end of the circuit module 7, and the output end of the circuit module 7 is connected to a display 4. A display 4 and function keys 5 are installed on the panel of the housing 2 of the mainframe. It is characterized in that a test port 3 is provided on the housing 2 of the mainframe (usually located at the top), and the coil 6 is provided around the inside of the test port 3. A sampler 1 is also provided which cooperates with the test port 3. The sampler 1 includes a sampling nozzle 11, a sampling piston 12, a sample storage tube 13, and a piston rod 14. The sampling nozzle 11 is provided at the front end of the sample storage tube 13. The sampling piston 12 is slidably installed inside the sample storage tube 13. The front end of the piston rod 14 is connected to the rear end of the sampling piston 12, and the rear end of the piston rod 14 extends out of the rear end of the sample storage tube 13. The above parts of the sampler 1 have the same structure as a common syringe.

[0014] A coaxial pull rod tube 15 is connected to the rear end of the sample storage tube 13. A pull rod 16 is slidably installed inside the pull rod tube 15. The front end of the pull rod 16 is connected to the rear end of the piston rod 14, and the rear end of the pull rod 16 extends out of the rear end of the pull rod tube 15 and is provided with a radial through hole 21. A positioning scale 19 is provided outside the pull rod tube 15. A plurality of spaced-apart positioning holes 20 are provided at the rear part of the positioning scale 19. A positioning rod 18 for passing through the through hole 21 and inserting into the positioning hole 20 is also provided. The positioning hole 20 can be a through hole or a threaded hole, and the positioning rod 18 is correspondingly a smooth rod or a screw rod.

[0015] The front end of the positioning scale 19 is connected to the outside of the pull rod tube 15 through a sleeve 17 (or directly). Considering the complex application working conditions of the equipment and the inconvenient sampling at the narrow sampling parts of some equipment, the sampler 1 is configured with a pull rod 16 of a certain length, which can facilitate sampling.

[0016] The circuit module 7 includes an oscillator, an F / V converter, an amplifier, and an A / D circuit. The input end of the oscillator is connected to the coil 6. The output end of the oscillator is sequentially connected to the F / V converter, the amplifier, and the A / D circuit. The output end of the A / D circuit is connected to the display 4. The F / V converter therein is used to convert the frequency signal output by the oscillator into a voltage (or current) signal, which becomes a digital signal or a curve (graph) proportional to the content of ferromagnetic particles in the measured lubricating grease after being amplified by the amplifier and processed by the A / D circuit, and is displayed on the display.

[0017] The function keys 5 include necessary keys or knobs such as a power switch, vibration frequency adjustment, and amplification adjustment (calibration) of the amplifier. The display 4 can also be a touch screen to complete some functions of the function keys 5. All belong to conventional technologies.

[0018] Usage method of the present invention:

[0019] 1. Sampling: Insert the sampling nozzle 11 of the sampler 1 into the fuel tank (a component similar to an injection needle can be installed on the sampling nozzle 11 for convenient sampling), pull out the pull rod 16 to suck the required amount (such as 5 ml) of the lubricating grease to be measured into the sample storage tube 13; then pass the positioning rod 18 through the through hole 21 behind the pull rod 16 and insert it into a positioning hole 20 at the rear of the positioning scale 19 to prevent the sample in the sampler 1 from leaking or being contaminated, and facilitate carrying the sample to the test host for testing. Severely worn samples can also be taken away from the site for further analysis.

[0020] 2. Measurement: After the test host is turned on and stabilized for 10 minutes to ensure the equipment is in a stable state, place the front part (the part of the sample storage tube 13) of the sampler 1 with the sample into the test port 3 at the top of the host housing 2, click the "Reading" button, and the display 4 shows the corresponding numbers or curves (length or height graphs). Determine the ferromagnetic particle content according to the size of the numbers or graphs.

[0021] Calibrate the device regularly. Use the sampler 1 to calibrate the lubricating grease standard products with iron contents of 50 ppm, 100 ppm, 200 ppm, 500 ppm, and 1000 ppm on the test host respectively.

[0022] The working principle of the present invention is: When the lubricating grease containing ferromagnetic particles is placed in the coil 6, the inductance of the coil 6 is changed, thereby changing the vibration frequency of the oscillator. The change amount of the vibration frequency is converted into a voltage or current signal through the F / V converter, and after being amplified and processed by the amplifier and the A / D circuit, it is converted into a digital signal proportional to the ferromagnetic particle content, and finally displayed on the display 4. By calibrating with lubricating grease with a known ferromagnetic particle content, the ferromagnetic particle content in the lubricating grease to be measured can be detected.

Claims

1. An apparatus for rapidly measuring the content of ferromagnetic wear particles in used lubricating grease, comprising a test mainframe. Inside the mainframe housing (2), a coil (6) and a circuit module (7) are installed. The coil (6) is connected to the input end of the circuit module (7), and the output end of the circuit module (7) is connected to a display (4). On the panel of the mainframe housing (2), a display (4) and function keys (5) are installed. It is characterized in that a test port (3) is provided on the mainframe housing (2), and the coil (6) is provided around the inside of the test port (3). A sampler (1) is also provided, which cooperates with the test port (3). The sampler (1) includes a sampling nozzle (11), a sampling piston (12), a sample storage tube (13), and a piston rod (14). The sampling nozzle (11) is provided at the front end of the sample storage tube (13). The sampling piston (12) is slidably installed inside the sample storage tube (13). The front end of the piston rod (14) is connected to the rear end of the sampling piston (12), and the rear end of the piston rod (14) extends out of the rear end of the sample storage tube (13). A coaxial pull rod tube (15) is connected to the rear end of the sample storage tube (13). A pull rod (16) is slidably installed inside the pull rod tube (15). The front end of the pull rod (16) is connected to the rear end of the piston rod (14), and the rear end of the pull rod (16) extends out of the rear end of the pull rod tube (15) and is provided with a radial through hole (21). A positioning scale (19) is provided outside the pull rod tube (15), and a plurality of spaced positioning holes (20) are provided at the rear part of the positioning scale (19). A positioning rod (18) for passing through the through hole (21) and inserting into the positioning hole (20) is also provided. When lubricating grease containing ferromagnetic particles is placed inside the coil, the inductance of the coil is changed, thereby changing the vibration frequency of the oscillator. The change amount of the vibration frequency is converted into a voltage or current signal through an F / V converter, amplified and processed by an amplifier and an A / D circuit, and converted into a digital signal proportional to the content of ferromagnetic particles, and finally displayed on the display. By calibrating with lubricating grease of known ferromagnetic particle content, the content of ferromagnetic particles in the measured lubricating grease is detected. The circuit module (7) includes an oscillator, an F / V converter, an amplifier, and an A / D circuit. The input end of the oscillator is connected to the coil (6), and the output end of the oscillator is sequentially connected to the F / V converter, the amplifier, and the A / D circuit. The output end of the A / D circuit is connected to the display (4).

2. The apparatus for rapidly measuring the content of ferromagnetic wear particles in used lubricating grease according to claim 1, It is characterized in that the front end of the positioning scale (19) is directly or connected to the outside of the pull rod tube (15) through a sleeve (17).

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