CN106404608B - Lubricating interface sum frequency signal measuring device and method for measuring tribochemical performance - Google Patents
Lubricating interface sum frequency signal measuring device and method for measuring tribochemical performance Download PDFInfo
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- CN106404608B CN106404608B CN201610775652.1A CN201610775652A CN106404608B CN 106404608 B CN106404608 B CN 106404608B CN 201610775652 A CN201610775652 A CN 201610775652A CN 106404608 B CN106404608 B CN 106404608B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001050 lubricating effect Effects 0.000 title claims abstract description 21
- 238000006073 displacement reaction Methods 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000000314 lubricant Substances 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 abstract description 12
- 238000005259 measurement Methods 0.000 description 11
- 238000001845 vibrational spectrum Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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Abstract
The invention relates to a lubrication interface sum frequency signal measuring device, which comprises: a prism frame displacement adjusting mechanism, a prism frame, a hemispherical segment prism and a movable ball. The prism frame is arranged on the prism frame displacement adjusting mechanism, the hemispherical segment prism is arranged on the prism frame, and the movable ball can rotate or swing. The prism frame displacement adjusting mechanism can adjust the height of the prism frame and the parallelism of the prism frame and the horizontal plane, and further adjust the height of the hemispherical prism and the parallelism of the hemispherical prism and the horizontal plane, so that the hemispherical prism is contacted with the movable ball, and the movable ball and the hemispherical prism form a pair of friction pairs. In addition, the invention also relates to a method for measuring the tribochemical performance of the lubricating interface on line.
Description
Technical Field
The invention relates to an experimental device and a method, in particular to a sum frequency signal online measuring device for a friction process under a lubricating interface condition and a method for measuring the friction chemical property of the lubricating interface.
Background
The interface phenomenon is closely related to the nature, the interface research is closely related to a plurality of physical and chemical problems, and the interface research is applied to the fields of material science, physical chemistry, analytical chemistry, polymer chemistry, environmental protection, petrochemical industry and the like. The lubricating interface can generate chemical change in the interface molecules in the friction process, and the friction process has important significance for the interface research. At present, some interface research means, such as mechanical, optical and electrochemical methods, as well as particle scattering and X-ray diffraction technologies, and the like exist, most of the methods need to be carried out under vacuum conditions, and the surface state of a sample needs to be changed, and mechanical methods, such as surface tension and contact angle measurement, can know the macroscopic properties of a gas-liquid interface and a solid-liquid interface, but cannot obtain the microscopic molecular information of the gas-liquid interface and the solid-liquid interface. The above experimental techniques are limited by various conditions, and the sum frequency vibration spectrum is used as a nonlinear optical method, has unique interface selectivity and interface monolayer sensitivity, and is favorable for analyzing measurement signals to obtain interface molecular information.
And the sum frequency vibration spectrum can give information of molecules in the aspects of interface orientation, interface molecule density, molecular vibration peak mode attribution, dynamics and the like through measurement of light intensity, phase and polarization. However, the sum frequency signal is very weak, and an experimental device needs to be designed for measuring the sum frequency signal of the friction process under the condition of the lubrication interface.
Disclosure of Invention
In view of the above, it is necessary to provide a device for measuring the intermediate frequency signal in a dynamic system and a method for measuring the tribochemical properties of a lubrication interface.
A lubricated interface and frequency signal measuring device, comprising: a prism frame displacement adjusting mechanism, a prism frame, a hemispherical segment prism and a movable ball. The prism frame is arranged on the prism frame displacement adjusting mechanism, the hemispherical segment prism is arranged on the prism frame, and the movable ball can rotate or swing. The prism frame displacement adjusting mechanism can adjust the height of the prism frame and the parallelism of the prism frame and the horizontal plane, and further adjust the height of the hemispherical prism and the parallelism of the hemispherical prism and the horizontal plane, so that the hemispherical prism is contacted with the movable ball, and the movable ball and the hemispherical prism form a pair of friction pairs.
A method of measuring tribochemical properties, comprising the steps of: providing a lubricating interface sum frequency signal measuring device, wherein a pair of friction pairs is formed by a ball and a hemispherical prism-lacking mirror in the lubricating interface sum frequency signal measuring device; two beams of light of the sum frequency system are vertically incident from the circumferential surface of the hemispherical segmental prism respectively and are converged at the contact point of the hemispherical segmental prism and the movable sphere, so that sum frequency light is generated; the sum frequency light is vertically emitted out through the circumferential surface of the hemispherical segmental prism and enters a monochromator after being reflected by a subsequent reflector, and is used for analyzing chemical changes generated in the friction process.
Compared with the prior art, the lubricating interface and frequency signal measuring device provided by the invention realizes the precise contact of the movable ball and the hemispherical segmental prism in the friction process; the hemispherical prism not only provides a fixed interface, but also enables light to vertically enter, ensures the total reflection of the incident light at the interface, and enhances the energy of the light so as to enhance sum frequency signals; and the online measurement of the sum frequency signal in the friction process is realized. In addition, the invention adopts a sum frequency vibration spectrum method, takes infrared light and visible light as incident light, two beams of light are overlapped at a lubricating interface to generate a sum frequency signal, has unique interface selectivity and interface monolayer sensitivity, and is beneficial to analyzing a measurement signal to obtain interface molecular information.
Drawings
Fig. 1 is a schematic perspective view of a lubrication interface and a frequency signal measurement device according to an embodiment of the present invention.
Fig. 2 is a top view of a lubrication interface and a frequency signal measurement device according to an embodiment of the present invention.
Fig. 3 is a side view of a lubrication interface and a frequency signal measurement device provided by an embodiment of the present invention.
Fig. 4 is a schematic diagram of a three-dimensional structure of a hemispherical prism according to an embodiment of the present invention.
Fig. 5 is an experimental schematic diagram for measuring a lubrication interface and a frequency signal according to an embodiment of the present invention.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The lubrication interface and the frequency signal measuring device provided by the invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The lubricating interface sum frequency signal measuring device comprises a prism frame displacement adjusting mechanism, a prism frame, a hemisphere prism lack mirror and a movable ball. The prism frame is arranged on the prism frame displacement adjusting mechanism, and the prism frame displacement adjusting mechanism can adjust the height of the prism frame and the parallelism of the prism frame and the horizontal plane, so as to adjust the height of the prism and the parallelism of the prism and the horizontal plane, and make the prism contact with the movable ball.
Referring to fig. 1 to 3, a specific structure of a lubrication interface and frequency signal measuring device 1 includes: a prism frame displacement adjusting mechanism 10, a prism frame 11, a hemisphere prism lack mirror 12 and a movable ball. The prism frame displacement adjusting mechanism 10 comprises a vertical displacement adjusting platform 13, a vertical fixing rod frame 14, a prism frame horizontal displacement adjusting unit 16 and a height adjusting knob 17.
The vertical displacement adjusting platform 13 may be a scissor-type lifting platform, and the vertical displacement adjusting platform 13 is manually driven to lift, or may be other lifting platforms as long as the vertical displacement adjusting platform 13 can lift.
The vertical fixing bar 14 includes a first vertical fixing bar 141 and a second vertical fixing bar 142. The prism frame horizontal displacement adjusting unit 16 comprises a first platform 161, a second platform 162 and a plurality of knobs 163 passing through the first platform 161 and contacting the second platform 162. The first platform 161 is disposed on the vertical displacement adjusting platform 13 through a first vertical fixing rod frame 141, and the second platform 162 is disposed on a plurality of knobs 163 penetrating through the first platform 161. The second vertical fixing bar bracket 142 is fixed to the second platform 162. The height adjusting knob 17 is disposed on the second vertical fixing rod bracket 142, and can adjust the height of the vertical fixing rod bracket 14.
The prism frame 11 is composed of a first prism frame 110 and a second prism frame 111, the first prism frame 110 includes a first transverse bar frame 112, a first fixing device 113 and a first locking device 114, the first fixing device 113 is disposed at one end of the first transverse bar frame 112, and the other end of the first transverse bar frame 112 is fixed to the second vertical fixing bar frame 142 through the first locking device 114. The second prism frame 111 comprises a second transverse bar frame 115, a second fixing device 116 and a second locking device 117, the second fixing device 116 is disposed at one end of the second transverse bar frame 115, and the other end of the second transverse bar frame 115 is fixed to the second vertical fixing bar frame 142 through the second locking device 117. And, the first fixing device 113 and the second fixing device 116 are disposed opposite to each other in the vertical direction, and are used for fixing the hemispherical segment prism 12 therein. The positions of the first prism frame 110 and the second prism frame 111 on the second vertical fixing rod frame 142 are adjustable, so that the prisms 12 with different sizes can be clamped by the prism frame 11.
The movable ball is supported by a support means (not shown), and in particular the movable ball may be arranged on, supported by, three ceramic bearings, and one end of the movable ball is connected to a connecting shaft, which is connected to a transmission shaft, which is connected to a motor via a coupling. The movable ball may be rotated or swung by the driving of the motor.
The height of the hemispherical segment prism 12 can be adjusted by adjusting the vertical displacement adjusting platform 13, the height adjusting knob 17 or the prism frame 11, so that the hemispherical segment prism 12 is contacted with the movable ball.
The hemispherical segment prism 12 is fixed by the first fixing device 113 and the second fixing device 116, and the parallelism between the second platform 162 and the horizontal plane can be adjusted by adjusting some of the knobs 163 of the plurality of knobs 163 penetrating the first platform 161, so as to adjust the bottom surface of the hemispherical segment prism 12 to be parallel to the horizontal plane.
The movable ball can be contacted with the hemispherical segmental prism 12 by controlling the lubricating interface and the frequency signal measuring device 1, the movable ball is driven to rotate or swing after the motor rotates, and the movable ball and the lower surface of the hemispherical segmental prism 12 form a pair of friction pairs.
The hemispherical segmental prism 12 is a hemispherical segmental quartz prism which is designed and processed by self. Referring to fig. 4, the half-sphere prism 12 is a prism in which the top of the half-sphere prism is cut off by a plane. The hemispherical segment prism 12 includes an upper surface, a lower surface, and a circumferential surface disposed between the upper surface and the lower surface. The upper and lower surfaces may or may not be parallel. Preferably, the upper surface and the lower surface are parallel, and the diameter ratio of the upper surface to the lower surface is 1: 2. the first and second fixing means 113 and 116 are in contact with the upper and lower surfaces, respectively, to hold the hemispherical-segment prism 12 therebetween.
It will be appreciated that the lubrication interface and frequency signal measurement device 1 may further comprise a microscope 19, the microscope 19 facilitating observation of the coincidence of the light points.
The embodiment of the invention also provides a method for measuring the tribochemical performance of the lubricating interface on line.
First, a lubrication interface and a frequency signal measuring device 1 as described above are provided. Referring to fig. 5, the hemispherical prism 12 and the movable ball 18 are used as a pair of friction pairs, and a lubricant 20 is added between the pair of friction pairs. The lower surface of the hemispherical prism 12 is placed parallel to the horizontal plane, the hemispherical prism 12 is in contact with the movable ball 18, and then the motor is started, so that the movable ball 18 obtains the rotating speed, and friction is generated between the movable ball 18 and the hemispherical prism 12. The positions of the hemispherical prism 12 and the movable ball 18 are adjusted so that the hemispherical prism 12 and the movable ball 18 are positioned right at the convergence point of the infrared light and the visible light. The infrared light and the visible light of the sum frequency system are respectively vertically incident from the circumferential surface of the hemispherical prism, namely, the infrared light and the visible light of the sum frequency system are incident to the spherical center of the hemispherical prism, namely, are converged at the contact point of the hemispherical prism 12 and the movable sphere 18, and meanwhile, the optical path difference of the two beams of light is 0, so that the time overlapping is ensured. Therefore, sum frequency light with the frequency being the sum of the frequencies of the two beams of light is generated, vertically emitted through the circumferential surface of the hemispherical prism-lacking mirror 12, and then reflected by the reflector to enter the monochromator for analyzing chemical changes generated in the friction process in real time.
The sum frequency vibration spectrum belongs to a second-order nonlinear optical effect, and is light omega with different frequencies1And ω2Interacting with a non-linear medium to generate a beam with frequency omega1+ω2Of (2) is detected. And sum frequency vibration spectrum is the vibration spectrum of the interface molecules. In the experiment, a beam of infrared light omega with tunable frequency1And a beam of fixed frequency omega2The two beams of light are completely overlapped in time and space and can generate a frequency omega1+ω2Of mixed frequency light, tuning frequency omega of infrared light1And the sum frequency light is enhanced until the infrared frequency is matched with the vibration energy level of the interface molecules, and is represented as a spectrum peak on the spectrum, and the sum frequency signal changes along with the infrared frequency, namely the sum frequency spectrum of the interface molecules.
The working principle of the method for measuring the friction chemical property of the lubricating interface on line comprises the following steps: the chemical performance characterization of the friction experiment of the lubricating interface adopts a sum frequency vibration spectrum method, takes infrared light and visible light as incident light, two beams of light are overlapped at the lubricating interface to generate a sum frequency signal, and the sum frequency vibration spectrum is measured to analyze interface molecular information in the friction process. When the movable ball 18 rotates coaxially with the motor, a pair of friction pairs is formed with the hemispherical prism 12, a lubricating interface is formed after the lubricant 20 is added, and the change of lubricating interface molecules in the friction process of the movable ball 18 and the hemispherical prism 12 can be detected on line according to the measured sum frequency signal.
The lubricating interface and frequency signal measuring device provided by the embodiment can realize that: the ball is precisely contacted with the prism in the friction process; the self-designed hemispherical prism-lacking lens not only provides a fixed interface, but also enables light to be vertically incident, ensures the total reflection of the incident light at the interface, and enhances the energy of the light so as to enhance sum frequency signals; and the online measurement of the sum frequency signal in the friction process is realized. In the embodiment, a sum frequency vibration spectrum method is adopted, infrared light and visible light are used as incident light, two beams of light are overlapped at a lubrication interface to generate a sum frequency signal, and the sum frequency signal has unique interface selectivity and interface monolayer sensitivity and is beneficial to analyzing a measurement signal to obtain interface molecule information.
In addition, other modifications within the spirit of the invention may occur to those skilled in the art, and such modifications within the spirit of the invention are intended to be included within the scope of the invention as claimed.
Claims (7)
1. A lubricated interface and frequency signal measuring device, comprising:
a prism frame displacement adjusting mechanism;
the prism frame is arranged on the prism frame displacement adjusting mechanism;
the hemispherical prism comprises an upper surface, a lower surface and a circumferential surface arranged between the upper surface and the lower surface, wherein the upper surface and the lower surface are parallel, and the hemispherical prism is arranged on the prism frame;
a movable ball capable of rotating or swinging;
a microscope for observing the coincidence of the light spots;
the prism frame displacement adjusting mechanism can adjust the height of the prism frame and the parallelism of the prism frame and the horizontal plane, further adjust the height of the hemispherical prism and the parallelism of the hemispherical prism and the horizontal plane, so that the hemispherical prism contacts with the movable ball, the movable ball and the hemispherical prism form a pair of friction pairs,
the prism frame displacement adjusting mechanism comprises a vertical displacement adjusting platform, a vertical fixing rod frame, a prism frame horizontal displacement adjusting unit and a height adjusting knob; the vertical fixing rod frame is arranged on the vertical displacement adjusting platform; the prism frame is arranged on the vertical fixing rod frame, and the prism frame horizontal displacement adjusting unit is arranged on the vertical fixing rod frame and used for adjusting the parallelism of the prism and the horizontal plane; the height adjusting knob is arranged on the vertical fixing rod frame and used for adjusting the height of the prism; the vertical fixing rod frame comprises a first vertical fixing rod frame and a second vertical fixing rod frame; the prism frame horizontal displacement adjusting unit comprises a first platform, a second platform and a plurality of knobs which are arranged on the first platform in a penetrating mode and are in contact with the second platform, the first platform is arranged on the vertical displacement adjusting platform through a first vertical fixing rod frame, and the second platform is arranged on the plurality of knobs which are arranged on the first platform in a penetrating mode; the second vertical fixing rod frame is fixed on the second platform; the bottom surface of the hemispherical segmental prism can be adjusted to be parallel to the horizontal plane by adjusting certain knobs.
2. The lubricated interface and frequency signal measuring device of claim 1, wherein: the diameter ratio of the upper surface to the lower surface is 1: 2.
3. the lubricated interface and frequency signal measuring device of claim 1, wherein: the prism frame is composed of a first prism frame and a second prism frame, and the first prism frame and the second prism frame fix the hemispherical prism.
4. A lubricated interface and frequency signal measuring device as claimed in claim 3, wherein: the first prism frame comprises a first transverse bar frame, a first fixing device and a first locking device, the first fixing device is arranged at one end of the first transverse bar frame, and the other end of the first transverse bar frame is fixed on the second vertical fixing bar frame through the first locking device; the second prism frame comprises a second transverse rod frame, a second fixing device and a second locking device, the second fixing device is arranged at one end of the second transverse rod frame, and the other end of the second transverse rod frame is fixed on the second vertical fixing rod frame through the second locking device; the first fixing device and the second fixing device are arranged oppositely in the vertical direction and are used for fixing the hemispherical prism-lacking mirror.
5. The lubricated interface and frequency signal measuring device of claim 4, wherein: and the first fixing device and the second fixing device are respectively contacted with the upper surface and the lower surface of the hemispherical prism to fix the hemispherical prism.
6. A method of measuring tribochemical properties, comprising the steps of:
providing a lubricating interface and frequency signal measuring device according to any one of claims 1 to 5, wherein a pair of friction pairs is formed by a ball and a hemispherical prism lacking mirror in the lubricating interface and frequency signal measuring device;
two beams of light of the sum frequency system are vertically incident from the circumferential surface of the hemispherical segmental prism respectively and are converged at the contact point of the hemispherical segmental prism and the movable sphere, so that sum frequency light is generated;
the sum frequency light is vertically emitted out through the circumferential surface of the hemispherical segmental prism and enters a monochromator after being reflected by a subsequent reflector, and is used for analyzing chemical changes generated in the friction process.
7. The method of measuring tribochemical properties according to claim 6, wherein: and a lubricant is added to a contact area of the movable ball and the hemispherical segmental prism.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610775652.1A CN106404608B (en) | 2016-08-31 | 2016-08-31 | Lubricating interface sum frequency signal measuring device and method for measuring tribochemical performance |
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| CN201610775652.1A CN106404608B (en) | 2016-08-31 | 2016-08-31 | Lubricating interface sum frequency signal measuring device and method for measuring tribochemical performance |
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| CN106404608A CN106404608A (en) | 2017-02-15 |
| CN106404608B true CN106404608B (en) | 2019-12-20 |
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2016
- 2016-08-31 CN CN201610775652.1A patent/CN106404608B/en active Active
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