CN112067426A - Visual measuring device for erosion of separated valve port and using method - Google Patents
Visual measuring device for erosion of separated valve port and using method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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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
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- 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
A visual measuring device for erosion of a separated valve port and a using method are provided, wherein an oil inlet flow channel (1 a), a valve port plate seat (1 f), a valve port seat (1 g), an oil return flow channel (1 e) and a sealing groove (1 c) are formed in a bottom plate (1); 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 a high-speed camera to a valve port; step (2) recording the erosion process; step (3), disassembling the valve port plate (10) and the valve port plate (12); step (4) recording the appearance of the working edge by using a appearance instrument, and measuring the diameter (phi) of the fillet; step (5), installing the valve port plate (10) and the valve port plate (12) into a test model; repeating the steps (3) - (5) for N times, wherein N is more than or equal to 3; and (7) comparing the change of the erosion morphology of the Nth time and the (N + 1) th time, wherein N is more than or equal to 1.
Description
Technical Field
The invention relates to the field of hydraulic slide valve experiment devices, in particular to a hydraulic valve port erosion visualization measurement technology.
Background
Erosion is a type of wear in which the surface of a material is damaged when impacted by small, loose, flowing particles. Erosive wear has become one of the causes of material failure in many industrial sectors, and british scientists t.s.eyre consider erosive wear to account for 8% of the total number of wear failures that are common in industrial production. Erosion is caused by the impact of a multiphase flow medium on the surface of a material, and is classified into sand blast type erosion (the medium is gas) and slurry type erosion (the medium is liquid) according to the medium. The erosion wear in the hydraulic element belongs to slurry type erosion, namely, solid particles carried by liquid impact the surface of a material at a certain speed to cause erosion. The hydraulic element is a high-load precision element, and various friction pairs in the hydraulic pump, a control valve port of the hydraulic valve and the like 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, which to some extent determines the control characteristics of the hydraulic valve. Therefore, the structural integrity and accuracy of the hydraulic valve port also determines the hydraulic valve port characteristics.
The solid particle pollutants are the most common pollutants with the greatest harm effect in the hydraulic system, and the faults of the hydraulic system caused by the 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 act as accelerated 'shells' and impact the valve port, particularly the valve port control edge, and under the repeated action of the high-energy erosion, the valve port control edge is eroded and abraded and has irreversibility, so that the control performance of the hydraulic valve port and the control performance of the hydraulic valve port are degraded. Long-term experiments of the overflow valve under the water-in-oil emulsion are carried out by British coal research institute, and the erosion groove is found at the valve seat, so that the sealing failure is finally caused.
The traditional hydraulic valve design does not consider the special property that oil belongs to solid-liquid two-phase flow, the cleanliness of the oil is generally controlled by arranging a filter in a hydraulic system loop, and the anti-erosion capacity is not given to an element from the design angle of the element.
Therefore, the effective anti-erosion design scheme of the hydraulic valve port can be provided only by researching the erosion mechanism of the hydraulic valve port under the action of the oil liquid containing solid particles. The prior patent publications are searched to find that the research on the erosion of the hydraulic valve port mainly comprises the following steps: 1) "analysis of hydraulic valve erosion wear characteristics and structural discussion [ J ]" (zhanghong, bear poem, Liangyi dimension, bear dawn Yan. coal journal, 2008(02): 214-; 2) the numerical simulation [ J ] "( Yao, Jiahua, Jinyao lan. Zhejiang university journal (engineering edition), 2015,49(12): 2252-. 3) "a real-time observation device [ P ] of valve port efflux erosion" (Ji hong, Chen Qianpeng, Zhao Jihong, Liu Shi Qi, Weichunhui, Zhang Beizhen, Wan Ji, Zhang Hao.Gansu province: CN109975154A,2019-07-05.) proposes a real-time observation device for valve port jet erosion by using a high-speed camera, in which the valve port opening is adjusted by a cam mechanism.
The above research and test method related to the erosion of the hydraulic valve port provides a beneficial reference for the visual and measurement experiment of the erosion of the hydraulic valve, but has the following defects:
(1) due to the complexity of valve port flow, most of the current valve port erosion mechanisms are still researched in theoretical analysis and numerical calculation, and the valve port erosion experimental device and research are few;
(2) the relevant erosion experimental device can only visualize the valve port flow process, the valve port and the valve body can not be separated, the valve port erosion appearance can not be further researched, and the correlation between the liquid flow erosion and the erosion appearance can not be established.
Disclosure of Invention
The invention aims to provide a visual measuring device for erosion of a separated valve port and a using method.
The invention relates to a visual measuring device for erosion of a separated valve port and a using method, 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 microscope lens 16 and an automatic zooming three-dimensional surface morphology instrument 17, wherein the bottom plate 1 is provided with an oil inlet 1b, an oil inlet flow channel 1a, a first valve port plate seat 1f, a second valve port seat 1g, an oil return flow channel 1e, an oil return port 1d and a sealing groove 1c, and the overflowing sections of the oil inlet flow channel 1a and the oil return flow channel 1e are 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, the first valve port plate 10 is provided with a first dismounting screw hole 10a, the second valve port plate 12 is provided with a second dismounting screw hole 12a, and 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 3 a.
The invention discloses a using method of a separate valve port erosion visualization and measurement device, which comprises the following steps:
starting a hydraulic station of an experimental system, opening a high-speed camera and debugging and focusing the high-speed camera to 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 a first valve port plate 10 and a second valve port plate 12;
step (3) opening the test model after the preset erosion time T, and detaching the first valve port plate 10 and the second valve port plate 12;
step (4) recording the appearance of the working edge of the valve port plate by using an automatic zooming three-dimensional surface appearance instrument, measuring the fillet 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 fillet diameter (phi) along with the working edge (step (4))x）Law of change of directionDrawing phi: (x) A curve;
step (5), the first valve port plate 10 and the second valve port plate 12 are installed into a test model;
step (6) repeating the steps (3) - (5) 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 for the Nth time and the (N + 1) th time by using an automatic zooming three-dimensional surface topography instrument difference 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 and equivalent to two-dimensional plane flow with the valve port flow characteristics, the separated valve port is composed 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 detached from the bottom plate. When high-pressure liquid flows through, a large pressure difference is generated to enable the liquid to pass through at a high speed, and an action process of oil liquid and solid particles under a micro opening degree and a valve port wall surface, particularly a valve port working edge, is captured by a high-speed camera with a high-power microscope 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 detaching screw holes, 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 contrastively analyzed, the valve port erosion process is visualized in combination, and the mapping relation between the valve port erosion process 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 effective valve port erosion resistant design.
Drawings
Fig. 1 is a schematic view of an experimental model of the present invention, fig. 2 is a high-speed camera system of the present invention, fig. 3 is an automatic zooming three-dimensional surface topography instrument, fig. 4 is a structural view of a bottom plate in the experimental model of the present invention, fig. 5 is a structural view of a first valve port plate in the experimental model of the present invention, fig. 6 is a structural view of a second valve port plate in the experimental model of the present invention, and fig. 7 is a graph of a split valve port phi (x).
Reference numerals and corresponding names: 1-bottom plate, 1 a-oil inlet flow channel, 1 b-oil inlet, 1 c-sealing groove, 1 d-oil return port, 1 e-oil return flow channel, 1 f-first valve port plate seat, 1 g-second valve port plate 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-sealing ring, 9-fifth screw, 10-first valve port plate, 10 a-first removing screw, 11-sixth screw, 12-second valve port plate, 12 a-second removing screw, 13-seventh screw, 14-eighth screw, 15-high-speed camera, 16-high-power microscope, And 17-automatic zooming three-dimensional surface topography instrument.
Detailed Description
The invention relates to a visual measuring device for erosion of a separated valve port and a using method, 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 microscope lens 16 and an automatic zooming three-dimensional surface morphology instrument 17, wherein the bottom plate 1 is provided with an oil inlet 1b, an oil inlet flow channel 1a, a first valve port plate seat 1f, a second valve port seat 1g, an oil return flow channel 1e, an oil return port 1d and a sealing groove 1c, and the overflowing sections of the oil inlet flow channel 1a and the oil return flow channel 1e are 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, the first valve port plate 10 is provided with a first dismounting screw hole 10a, the second valve port plate 12 is provided with a second dismounting screw hole 12a, and 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 3 a.
In the measuring device, the high power microscope 16 is mounted on the high speed camera 15 and is used for capturing the erosion process of the oil containing particles in the valve port 1h 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.
As shown in fig. 6, an oil inlet 1b, an oil inlet flow passage 1a, an oil return flow passage 1e and an oil return port 1d are formed in a bottom plate 1 to form an oil flow passage; 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 first valve port plate 10 and the second valve port plate 12 form a valve port 1h, so that three-dimensional complex valve port flow is simplified and equivalent to two-dimensional plane flow with valve port flow characteristics.
The first screw hole 10a of tearing open together has been seted up on the first valve port board 10, has seted up the second on the second valve port board 12 and has played and tear screw hole 12a open, is convenient for after certain erosion time, dismantles first valve port board and second valve port board and gets off and carry out follow-up topography observation experiment.
As shown in fig. 1-6, the visualization screen 2 is made of transparent organic glass, and the cover plate 3 is provided with a visualization window 3 a. The high power microscope 16 is installed on the high speed camera 15 and is used for capturing the erosion process of the oil containing particles in the valve port 1h and the first valve port plate 10 and the second valve port plate 12, and 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 and comparing and analyzing the topography before and after the erosion.
As shown in fig. 1 to 7, the use method of the visual and measuring device for erosion of the separated valve port comprises the following steps:
starting a hydraulic station of an experimental system, opening a high-speed camera and debugging and focusing the high-speed camera to 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 a first valve port plate 10 and a second valve port plate 12;
step (3) opening the test model after the preset erosion time T, and detaching the first valve port plate 10 and the second valve port plate 12;
step (4) recording the appearance of the working edge of the valve port plate by using an automatic zooming three-dimensional surface appearance instrument, measuring the fillet 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 fillet diameter (phi) along with the working edge (step (4))x）Law of change of direction, drawing Φ: (x) A curve;
step (5), the first valve port plate 10 and the second valve port plate 12 are installed into a test model;
step (6) repeating the steps (3) - (5) 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 for the Nth time and the (N + 1) th time by using an automatic zooming three-dimensional surface topography instrument difference processing technology, wherein N is more than or equal to 1.
As shown in fig. 1 to 7, the working process of the present invention is: the three-dimensional complex valve port flow is simplified and equivalent to two-dimensional plane flow with the valve port flow characteristic, the valve port is formed by the first valve port plate and the second valve port plate, and the action process of oil and solid particles under micro-aperture and the wall surface of the valve port, especially the working edge of the valve port, is captured by means of a high-speed camera with a high-power microscope. In addition, after a certain erosion time, the first valve port plate and the second valve port plate which are the components of the separated valve port are detached from the first valve port plate seat and the second valve port plate seat on the bottom plate through the detaching screw holes, 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 contrastively analyzed, and the mapping relation between the valve port erosion process and the erosion appearance is established in combination with the visual result of the valve port erosion process, so that the erosion mechanism of the hydraulic valve port is revealed, and an experimental basis is provided for effective valve port erosion resistant design.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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 microscope head (16), automatic three-dimensional surface topography appearance (17) that zooms, its characterized in that: an oil inlet (1 b), an oil inlet flow channel (1 a), a first valve port plate seat (1 f), a second valve port seat (1 g), an oil return flow channel (1 e), an oil return port (1 d) and a sealing groove (1 c) are formed in the bottom plate (1), and the overflowing sections of the oil inlet flow channel (1 a) and the oil return flow channel (1 e) are rectangular; the first valve port plate (10) is embedded in a first valve port plate seat (1 f), the second valve port plate (12) is embedded in a second valve port seat (1 g), a valve port (1 h) is formed by the first valve port plate (10) and the second valve port plate (12), a first joint disassembly screw hole (10 a) is formed in the first valve port plate (10), a second joint disassembly screw hole (12 a) is formed in the second valve port plate (12), and the valve port (1 h) is separated from the bottom plate (1); the upper cover plate (3) is provided with a visual window (3 a).
2. The visual and measurement experimental apparatus of disconnect-type valve port erosion of claim 1, characterized in that: the high-power microscope lens (16) is arranged on the high-speed camera (15) and is used for capturing the erosion process of oil containing particles in 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 and measurement experimental apparatus of disconnect-type valve port erosion of claim 1, characterized in that the material of visual screen (2) is transparent organic glass.
4. Use method of visual and measuring device of disconnect-type valve port erosion, its characterized in that, its step is:
starting a hydraulic station of an experimental system, opening a high-speed camera and debugging and focusing the high-speed camera to 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 a first valve port plate (10) and a second valve port plate (12);
step (3) after the erosion time is preset, opening the test model, and detaching the first valve port plate (10) and the second valve port plate (12);
step (4) recording the appearance of the working edge of the valve port plate by using an automatic zooming three-dimensional surface appearance instrument, and measuring the first valve port plate (10) and theThe working edge fillet diameter (phi) of the second valve port plate (12) is analyzed and the fillet diameter (phi) is analyzed along with the thickness of the working edge (phi) (phi)x）Law of change of direction, drawing Φ: (x) A curve;
step (5), a first valve port plate (10) and a second valve port plate (12) are installed in a test model;
step (6) repeating the steps (3) - (5) 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 for the Nth time and the (N + 1) th time by using an automatic zooming three-dimensional surface topography instrument difference processing technology, wherein N is more than or equal to 1.
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Cited By (1)
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| CN113567108A (en) * | 2021-07-09 | 2021-10-29 | 同济大学 | Method for measuring erosion abrasion loss of valve port of slide valve |
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