CN112067426B - Visual measuring device for erosion of separated valve port and use method - Google Patents
Visual measuring device for erosion of separated valve port and use method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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Abstract
The separated valve port erosion visual measuring device comprises a base plate (1) provided with an oil inlet flow passage (1 a), a valve port plate seat (1 f), a valve port seat (1 g), an oil return flow passage (1 e) and a sealing groove (1 c); the valve port plate (10) and the valve port plate (12) are respectively provided with a dismounting screw hole (10 a) and a dismounting screw hole (12 a); the upper cover plate (3) is provided with a visual window (3 a). The method comprises the following steps: focusing the high-speed camera on the valve port; step (2) recording an erosion process; step (3) the valve port plate (10) and the valve port plate (12) are disassembled; recording the shape of the working edge by using a shape instrument, and measuring the diameter (phi) of the round angle; step (5), the valve port plate (10) and the valve port plate (12) are arranged in a test model; repeating the steps (3) - (5) for N times, wherein N is more than or equal to 3; and (7) comparing the N-th and N+1th erosion morphology changes, wherein N is more than or equal to 1.
Description
Technical Field
The invention relates to the field of hydraulic slide valve experimental devices, in particular to a visual measuring technology for erosion of a hydraulic valve port.
Background
Erosion is a type of abrasion phenomenon in which the surface of a material is broken when impacted by small, loose, flowing particles. Erosive wear has become one of the causes of material failure in many industrial sectors, and british scientist t.s.eyre believes that erosive wear accounts for 8% of the total number of wear failures that are frequent in industrial production. Erosion is caused by the impact of a multiphase flow medium on the surface of a material, and can be classified into sandblasting (medium gas) and slurry-type (medium liquid) erosion depending on the medium. The erosion wear in the hydraulic element belongs to slurry erosion, namely erosion caused by liquid carrying solid particles impacting the surface of a material at a certain speed. The hydraulic component is a high-load precise component, and various friction pairs, hydraulic valve control ports and the like in the hydraulic pump are extremely easy to be damaged by erosion and the like of polluted oil.
The hydraulic valve is essentially a "variable valve port", which determines the control characteristics of the hydraulic valve. Each valve port structure has a specific flow area, and to some extent, the valve port flow area determines the control characteristics of the hydraulic valve. Thus, the integrity and accuracy of the hydraulic port structure also determines the hydraulic port characteristics.
Solid particle pollutants are the most common pollutants with the greatest hazard effect in a hydraulic system, and the faults of the hydraulic system caused by solid particles account for 60% -70% of the total faults according to statistics. When high-speed oil containing solid particle pollutants flows through the hydraulic valve port, solid particles are like accelerated 'shells', strike the valve port, especially the valve port control edge, and under the repeated action of high-energy erosion, the valve port control edge is eroded and worn, and the high-speed oil has irreversibility, so that the control performance of the hydraulic valve port and the valve is degraded. Long-term experiments conducted by british coal institute on water-in-oil emulsion subsurface overflow valves have found erosion grooves at the valve seat, ultimately leading to seal failure.
The conventional hydraulic valve design does not consider the special property that oil belongs to solid-liquid two-phase flow, generally controls the cleanliness of the oil by arranging a filter in a hydraulic system loop, and does not endow the element with erosion resistance from the design angle of the element.
Therefore, the hydraulic valve port can be effectively designed to resist erosion only by researching the erosion mechanism of the hydraulic valve port under the action of oil containing solid particles. Search of prior art publications patent found that the studies on hydraulic port washout were mainly: 1) The hydraulic valve erosion and abrasion characteristic analysis and structure discussion [ J ] "(Zhang Hong, xiong Shibo, liang Yiwei, xiong Xiaoyan. Coal journal, 2008 (02): 214-217.) takes a high water-based planar pilot valve with a positive ejector rod structure as a research object, combines a computational fluid dynamics theory (CFD) with an erosion theory, and analyzes the erosion and abrasion distribution of coal particles to different parts of the high water-based planar valve through visual simulation; 2) The CFD method is adopted to research that particles in oil liquid generate erosion abrasion to the front stage of the jet pipe servo valve, so that the performance of the servo valve is reduced, and the result shows that the most serious erosion abrasion part of the jet pipe servo valve is a wedge and the erosion abrasion tends to be reduced along with the increase of jet pipe displacement. 3) "real-time observation device of valve port jet erosion [ P ]" (Ji Hong, chen Qianpeng, zhao Jihong, liu Shiqi, wei Chunhui, zhang Peizhen, mo, zhang He. Gansu province: CN109975154a, 2019-07-05.) proposes a real-time observation device for valve port jet erosion using a high-speed camera, wherein the valve port opening is adjusted by a cam mechanism.
The above related hydraulic valve port erosion research and test method provides a beneficial reference for hydraulic valve erosion visualization and measurement experiments, but has the following disadvantages:
(1) Because of the complexity of valve port flow, most of research on valve port erosion mechanism is still in theoretical analysis and numerical calculation at present, and valve port erosion experimental device and research are less;
(2) The related erosion experimental device can only visualize the flowing process of the valve port, the valve port and the valve body can not be separated, the erosion morphology of the valve port can not be further researched, and the correlation between the liquid flow erosion morphology and the erosion morphology is not established.
Disclosure of Invention
The invention aims to provide a separated valve port erosion visual measurement device and a use method thereof.
The invention relates to a separated valve port erosion visual measuring device and a using method thereof, wherein the measuring device comprises a bottom plate 1, a visual screen 2, an upper cover plate 3, a first valve port plate 10, a second valve port plate 12, a sealing ring 8, a high-speed camera 15, a high-power micro lens 16 and an automatic zooming three-dimensional surface appearance instrument 17, an oil inlet 1b, an oil inlet runner 1a, a first valve port plate seat 1f, a second valve port seat 1g, an oil return runner 1e, an oil return port 1d and a sealing groove 1c are arranged on the bottom plate 1, and the overflow cross sections of the oil inlet runner 1a and the oil return runner 1e are all rectangular; the first valve port plate 10 is embedded in the first valve port plate seat 1f, the second valve port plate 12 is embedded in the second valve port seat 1g, a valve port 1h is formed by the first valve port plate 10 and the second valve port plate 12, a first dismounting screw hole 10a is formed in the first valve port plate 10, and a second dismounting screw hole 12a is formed in the second valve port plate 12, so that the separation of the valve port 1h and the bottom plate 1 is realized; the upper cover plate 3 is provided with a visual window 3a.
The invention relates to a use method of a separated valve port erosion visualization and measurement device, which comprises the following steps:
starting an experiment system hydraulic station, opening a high-speed camera and debugging and focusing on a valve port area formed by a first valve port plate 10 and a second valve port plate 12;
step (2) opening a test model inlet stop valve, and recording the action process of solid particles in oil in a valve port area and the first valve port plate 10 and the second valve port plate 12;
step (3), after the etching time T is preset, opening a test model, and removing the first valve port plate 10 and the second valve port plate 12;
recording the appearance of the working edge of the valve port plate by using an automatic zooming three-dimensional surface appearance instrument, measuring the round corner diameter (phi) of the working edge of the first valve port plate 10 and the second valve port plate 12, and analyzing the thickness of the round corner diameter (phi) along with the thickness of the working edgex）Drawing phi according to the change rule of the directionx) A curve;
step (5) loading the first valve port plate 10 and the second valve port plate 12 into a test model;
step (6) repeating the steps (3) - (5) for N times, wherein N is more than or equal to 3;
and (7) comparing and analyzing the change rule of the valve port erosion morphology of the nth time and the (n+1) th time by using an automatic zooming three-dimensional surface morphology instrument differential processing technology, wherein N is more than or equal to 1.
Compared with the background technology, the invention has the beneficial effects that: the three-dimensional complex valve port flow is simplified to be equivalent to two-dimensional plane flow with valve port flow characteristics, the separation type valve port consists of a first valve port plate and a second valve port plate, and the first valve port plate and the second valve port plate can be separated and assembled from the bottom plate. When the high-pressure liquid flow flows through, a large pressure difference is generated, so that the liquid flow passes through at a high speed, and the action process of oil liquid and solid particles under a small opening degree and the valve port wall surface, particularly the working edge of the valve port, is captured by a high-speed camera with a high-power micro lens. In addition, after a certain erosion time, the first valve port plate and the second valve port plate can be detached from the first valve port plate seat and the second valve port plate seat on the bottom plate through the disassembling screw holes, and then the appearance of the working edge of the valve port is observed and recorded by using an automatic zooming three-dimensional surface appearance instrument, the appearance before and after erosion is compared and analyzed, the visualization of the erosion process of the valve port is combined, and the mapping relation between the erosion process of the valve port and the erosion appearance is established, so that the erosion mechanism of the hydraulic valve port is revealed, and an experimental basis is provided for providing an effective valve port erosion-resistant design.
Drawings
Fig. 1 is a schematic diagram of an experimental model of the present invention, fig. 2 is a high-speed camera system of the present invention, fig. 3 is an auto-zoom three-dimensional surface profiler, fig. 4 is a bottom plate structure diagram of an experimental model of the present invention, fig. 5 is a first valve port plate structure diagram of an experimental model of the present invention, fig. 6 is a second valve port plate structure diagram of an experimental model of the present invention, and fig. 7 is a graph of a separated valve port phi (x).
Reference numerals and corresponding names are: 1-bottom plate, 1 a-oil inlet flow channel, 1 b-oil inlet, 1 c-seal groove, 1 d-oil return port, 1 e-oil return flow channel, 1 f-first valve port seat, 1 g-second valve port seat, 1 h-valve port, 2-visual screen, 3-upper cover plate, 3 a-visual window, 4-first screw, 5-second screw, 6-third screw, 7-fourth screw, 8-seal ring, 9-fifth screw, 10-first valve port plate, 10 a-first dismounting screw, 11-sixth screw, 12-second valve port plate, 12 a-second dismounting screw, 13-seventh screw, 14-eighth screw, 15-high speed camera, 16-high magnification micro lens and 17-automatic zooming three-dimensional surface appearance.
Detailed Description
The invention relates to a separated valve port erosion visual measuring device and a using method thereof, wherein the measuring device comprises a bottom plate 1, a visual screen 2, an upper cover plate 3, a first valve port plate 10, a second valve port plate 12, a sealing ring 8, a high-speed camera 15, a high-power micro lens 16 and an automatic zooming three-dimensional surface appearance instrument 17, an oil inlet 1b, an oil inlet runner 1a, a first valve port plate seat 1f, a second valve port seat 1g, an oil return runner 1e, an oil return port 1d and a sealing groove 1c are arranged on the bottom plate 1, and the overflow cross sections of the oil inlet runner 1a and the oil return runner 1e are all rectangular; the first valve port plate 10 is embedded in the first valve port plate seat 1f, the second valve port plate 12 is embedded in the second valve port seat 1g, a valve port 1h is formed by the first valve port plate 10 and the second valve port plate 12, a first dismounting screw hole 10a is formed in the first valve port plate 10, and a second dismounting screw hole 12a is formed in the second valve port plate 12, so that the separation of the valve port 1h and the bottom plate 1 is realized; the visual screen 2 is made of transparent organic glass; the upper cover plate 3 is provided with a visual window 3a.
In the measuring device, the high-power micro lens 16 is installed on the high-speed camera 15 to capture the erosion process of the granular oil liquid containing the valve port 1h and the first valve port plate 10 and the second valve port plate 12; the automatic zoom three-dimensional surface topography instrument 17 is used for measuring the erosion topography of the first valve port plate 10 and the second valve port plate 12 after a certain erosion time.
As shown in fig. 6, an oil inlet 1b, an oil inlet flow channel 1a, an oil return flow channel 1e and an oil return port 1d are formed on a bottom plate 1; the first valve port plate 10 is embedded in the first valve port plate seat 1f, the second valve port plate 12 is embedded in the second valve port seat 1g, and the valve port 1h is formed by the first valve port plate 10 and the second valve port plate 12, so that three-dimensional complex valve port flow is simplified and equivalent to two-dimensional plane flow with valve port flow characteristics.
The first valve port plate 10 is provided with a first dismounting screw hole 10a, and the second valve port plate 12 is provided with a second dismounting screw hole 12a, so that after a certain erosion time, the first valve port plate and the second valve port plate are dismounted to carry out subsequent morphology observation experiments.
As shown in fig. 1 to 6, the material of the visual screen 2 is transparent organic glass, and a visual window 3a is formed on the cover plate 3. The high-power micro lens 16 is installed on the high-speed camera 15 and used for capturing the erosion process of the particle-containing oil liquid in the valve port 1h, the first valve port plate 10 and the second valve port plate 12, and the automatic zooming three-dimensional surface morphology meter 17 is used for measuring the erosion morphology of the first valve port plate 10 and the second valve port plate 12 after a certain erosion time and comparing and analyzing the morphology before and after the erosion.
As shown in fig. 1 to 7, the usage method of the separated valve port erosion visualization and measurement device comprises the following steps:
starting an experiment system hydraulic station, opening a high-speed camera and debugging and focusing on a valve port area formed by a first valve port plate 10 and a second valve port plate 12;
step (2) opening a test model inlet stop valve, and recording the action process of solid particles in oil in a valve port area and the first valve port plate 10 and the second valve port plate 12;
step (3), after the etching time T is preset, opening a test model, and removing the first valve port plate 10 and the second valve port plate 12;
recording the appearance of the working edge of the valve port plate by using an automatic zooming three-dimensional surface appearance instrument, measuring the round corner diameter (phi) of the working edge of the first valve port plate 10 and the second valve port plate 12, and analyzing the thickness of the round corner diameter (phi) along with the thickness of the working edgex）Drawing phi according to the change rule of the directionx) A curve;
step (5) loading the first valve port plate 10 and the second valve port plate 12 into a test model;
step (6) repeating the steps (3) - (5) for N times, wherein N is more than or equal to 3;
and (7) comparing and analyzing the change rule of the valve port erosion morphology of the nth time and the (n+1) th time by using an automatic zooming three-dimensional surface morphology instrument differential processing technology, wherein N is more than or equal to 1.
As shown in fig. 1 to 7, the working process of the invention is as follows: the three-dimensional complex valve port flow is simplified and equivalent to two-dimensional plane flow with valve port flow characteristics, a valve port is formed by a first valve port plate and a second valve port plate, and the action process of oil liquid and solid particles and the valve port wall surface, especially the valve port working edge under the tiny opening degree is captured by means of a high-speed camera with a high-power micro lens. In addition, after a certain erosion time, the first valve port plate and the second valve port plate which are separated from the valve port components are detached from the first valve port plate seat and the second valve port plate seat on the bottom plate through the disassembling screw holes, and then the appearance of the working edge of the valve port is observed and recorded by using an automatic zooming three-dimensional surface appearance instrument, the appearance before and after erosion is compared and analyzed, and the visual result of the valve port erosion process is combined, so that the mapping relation between the valve port erosion process and the erosion appearance is established, the hydraulic valve port erosion mechanism is revealed, and an experimental basis is provided for providing an effective valve port erosion-resistant design.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. Visual measuring device of disconnect-type valve port erosion, including bottom plate (1), visual screen (2), upper cover plate (3), first valve port board (10), second valve port board (12), sealing washer (8), high-speed camera (15), high-power micro-lens (16), automatic three-dimensional surface appearance (17), its characterized in that zooms automatically: an oil inlet (1 b), an oil inlet flow passage (1 a), a first valve port plate seat (1 f), a second valve port seat (1 g), an oil return flow passage (1 e), an oil return port (1 d) and a sealing groove (1 c) are formed in the bottom plate (1), and the overflow cross sections of the oil inlet flow passage (1 a) and the oil return flow passage (1 e) are rectangular; the first valve port plate (10) is embedded in the first valve port plate seat (1 f), the second valve port plate (12) is embedded in the second valve port seat (1 g), a valve port (1 h) is formed through the first valve port plate (10) and the second valve port plate (12), a first dismounting screw hole (10 a) is formed in the first valve port plate (10), and a second dismounting screw hole (12 a) is formed in the second valve port plate (12), so that the separation of the valve port (1 h) and the bottom plate (1) is realized; a visual window (3 a) is formed in the upper cover plate (3).
2. The split valve port washout visualization measurement device of claim 1, wherein: the high-power micro lens (16) is arranged on the high-speed camera (15) and used for capturing the erosion process of the granular oil liquid containing the valve port (1 h) and the first valve port plate (10) and the second valve port plate (12); the automatic zooming three-dimensional surface topography instrument (17) is used for measuring the erosion topography of the first valve port plate (10) and the second valve port plate (12) after a certain erosion time.
3. The visual measuring device for the erosion of the separated valve port is characterized in that the visual screen (2) is made of transparent organic glass.
4. A method of using a split valve port erosion visualization measurement device as defined in any one of claims 1 to 3, comprising the steps of:
starting an experiment system hydraulic station, opening a high-speed camera and debugging and focusing on a valve port area formed by a first valve port plate (10) and a second valve port plate (12);
step (2) opening a test model inlet stop valve, and recording the action process of solid particles in oil in a valve port area, a first valve port plate (10) and a second valve port plate (12);
after the erosion time is preset, opening a test model, and removing the first valve port plate (10) and the second valve port plate (12);
recording the appearance of the working edge of the valve port plate by using an automatic zooming three-dimensional surface appearance instrument, measuring the round corner diameters of the working edges of the first valve port plate (10) and the second valve port plate (12), analyzing the change rule of the round corner diameters (phi) along with the thickness direction of the working edges, and drawing a phi (x) curve; wherein phi is the diameter of a round corner, and x is the thickness of a working edge;
step (5), the first valve port plate (10) and the second valve port plate (12) are installed in a test model;
step (6) repeating the steps (3) to (5) for N times, wherein N is more than or equal to 3;
and (7) comparing and analyzing the change rule of the valve port erosion morphology of the nth time and the (n+1) th time by using an automatic zooming three-dimensional surface morphology instrument differential processing technology, wherein N is more than or equal to 1.
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| CN112067426B true CN112067426B (en) | 2023-08-04 |
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| CN113567108B (en) * | 2021-07-09 | 2022-07-05 | 同济大学 | Method for measuring erosion abrasion loss of valve port of slide valve |
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