CN115388066B - Hydraulic system cleanliness online detection system and method - Google Patents
Hydraulic system cleanliness online detection system and method Download PDFInfo
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- CN115388066B CN115388066B CN202211161490.4A CN202211161490A CN115388066B CN 115388066 B CN115388066 B CN 115388066B CN 202211161490 A CN202211161490 A CN 202211161490A CN 115388066 B CN115388066 B CN 115388066B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Abstract
The invention discloses a device, a system and a method for online detection of cleanliness of a hydraulic system, wherein the device, the system and the method comprise the following steps: the valve body is arranged in the shell, the shell is provided with a liquid inlet cavity, an air inlet cavity and a liquid outlet cavity which are communicated with the valve body, an air inlet one-way valve is arranged in the air inlet cavity, and a liquid inlet one-way valve is arranged in the liquid inlet cavity; the filter body, the filter body is connected with the casing is detachable, the inner chamber and the play liquid chamber intercommunication of the filter body, be equipped with multistage filter plate in the filter body, the filter fineness of filter plate reduces to the direction of keeping away from the casing along being close to the casing gradually. The invention can realize the automatic online detection of the cleanliness of the hydraulic system to be detected, and has high detection efficiency and detection accuracy.
Description
Technical Field
The invention belongs to the technical field of detection devices, and particularly relates to a device, a system and a method for online detection of cleanliness of a hydraulic system.
Background
Particulate impurities in hydraulic systems are a major cause of wear of components in hydraulic systems. Particulate impurities in the oil enter the kinematic pair, which can cause metal on the surface of the part to peel off, deteriorate the lubrication conditions and accelerate the wear of the part. Therefore, the cleanliness detection of the hydraulic system is enhanced, and relevant measures are taken, so that excessive abrasion of parts can be prevented, the working time of the hydraulic system is prolonged, the maintenance and repair cost of equipment is reduced, and the service lives of the equipment and the parts are prolonged.
At present, a common cleanliness detection method is a manual operation method, and is characterized in that a certain amount of oil is taken in a hydraulic system, the volume of the oil is measured, solid impurities in the oil are extracted, the solid impurities are manually classified, the weight of the solid impurities is weighed, and the solid impurities are compared with an NAS cleanliness grade division table to determine the cleanliness of the oil in the hydraulic system. The method can not realize on-line measurement, wastes time and labor, has low efficiency, has manual operation errors, and influences the detection accuracy.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the device, the system and the method for online detection of the cleanliness of the hydraulic system, which can realize automatic online detection of the cleanliness of the hydraulic system to be detected and have high detection efficiency and detection accuracy.
The invention provides the following technical scheme:
in a first aspect, an online cleanliness detection device for a hydraulic system is provided, which includes:
the valve body is arranged in the shell, the shell is provided with a liquid inlet cavity, an air inlet cavity and a liquid outlet cavity which are communicated with the valve body, an air inlet one-way valve is arranged in the air inlet cavity, and a liquid inlet one-way valve is arranged in the liquid inlet cavity;
the filter body is detachably connected with the shell, an inner cavity of the filter body is communicated with the liquid outlet cavity, a multi-stage filter disc is arranged in the filter body, and the filtering precision of the filter disc is gradually reduced along the direction from the filter body to the direction far away from the shell.
Furthermore, the valve body is provided with a special-shaped flow channel communicated with the air inlet cavity and the liquid outlet cavity, a transverse hole communicated with the special-shaped flow channel and a vertical hole communicated with the transverse hole, and the vertical hole is communicated with the liquid inlet cavity.
Further, the casing is equipped with the air inlet with the chamber intercommunication that admits air, the check valve that admits air switches on along the direction of air inlet to valve body, the feed liquor check valve switches on along the direction of feed liquor chamber to valve body.
Furthermore, the check valve admits air includes air inlet valve and admission valve spring, the valve body is connected to the one end of admission valve spring, and the afterbody of air inlet valve is connected to the other end, the head shape and the air inlet shape of air inlet valve match.
Further, the feed liquor check valve includes feed liquor valve body, feed liquor valve steel ball and feed liquor valve spring, the feed liquor valve body is connected with the casing is detachable, the feed liquor valve body is equipped with the inlet with feed liquor chamber intercommunication, the feed liquor valve steel ball is located in the feed liquor valve body and can the shutoff inlet, feed liquor valve steel ball is connected to the one end of feed liquor valve spring, and the feed liquor intracavity wall is connected to the other end.
Further, five stages of filter discs are arranged in the filter body, namely a first filter disc, a second filter disc, a third filter disc, a fourth filter disc and a fifth filter disc, wherein the filter precision of the first filter disc, the second filter disc, the third filter disc, the fourth filter disc and the fifth filter disc is 100 micrometers, 50 micrometers, 25 micrometers, 15 micrometers and 5 micrometers respectively.
Furthermore, a filter body cover is arranged at the end part of the filter body, and a liquid outlet communicated with the inner cavity of the filter body is formed in the filter body cover; the filter body is equipped with multistage clamping ring along the direction of casing to filter body lid in, the quantity of clamping ring is less than 1 of the quantity of cassette, the cassette is located respectively between casing and the first clamping ring, between two adjacent clamping rings and between last clamping ring and the filter body lid.
Further, the filter plate comprises a metal framework, double-layer metal wire nets clamped at the inner sides of the metal framework and a filter membrane clamped between the double-layer metal wire nets, the size of the opening of the metal wire mesh is larger than the filtering precision of the filtering membrane.
In a second aspect, an online detection system for the cleanliness of a hydraulic system is provided, which comprises an electromagnetic switch valve, a flow sensor, an air pump, a control module and the online detection device for the cleanliness of the hydraulic system in the first aspect; the liquid inlet one-way valve of the online hydraulic system cleanliness detection device is connected with the electromagnetic switch valve, a flow sensor is connected between the electromagnetic switch valve and the liquid inlet one-way valve, an air inlet cavity of the online hydraulic system cleanliness detection device is connected with the air pump, and the air pump, the electromagnetic switch valve and the flow sensor are respectively connected with the control module.
In a third aspect, a method for online detection of cleanliness of a hydraulic system by using the system of the second aspect is provided, which includes:
accessing the online cleanliness detection system of the hydraulic system to a hydraulic system to be detected;
the electromagnetic switch valve is opened through the control module, and if the hydraulic system to be tested has pressure, the liquid inlet one-way valve is directly opened; if the hydraulic system to be measured has no pressure, the air pump is opened through the control module, and the liquid inlet one-way valve is opened by utilizing the negative pressure generated by the gas flowing through the valve body;
oil in the hydraulic system to be measured enters the filter body after passing through the liquid inlet one-way valve, the liquid inlet cavity, the valve body and the liquid outlet cavity, and flows through the multi-stage filter sheets in the filter body, and the particulate matters with different size grades are intercepted by the filter sheets;
after the flow sensor reads the preset oil volume, closing the electromagnetic switch valve through the control module;
and taking out the filter discs at all levels, drying, and counting the number of particles on the surfaces of the filter discs at all levels to obtain the number of particles in unit volume of oil, and evaluating the cleanliness of the oil.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the online detection device for the cleanliness of the hydraulic system, the liquid inlet one-way valve is connected to the hydraulic system to be detected, and then is directly opened if the hydraulic system to be detected has pressure, and is opened by ventilating the air inlet cavity side if the hydraulic system to be detected has no pressure and utilizing the negative pressure generated by gas flowing through the valve body, so that the online detection device for the cleanliness of the hydraulic system to be detected with pressure and without pressure is applicable to the cleanliness detection of the hydraulic system to be detected with pressure and without pressure, and the application range is wide;
(2) The online detection device for the cleanliness of the hydraulic system, provided by the invention, is simple in structure, does not need to disassemble the hydraulic system to be detected when the cleanliness of the hydraulic system is detected, can realize the interception of particles with different sizes and grades in oil liquid through the multistage filter discs in the filter body, is time-saving and labor-saving, and is high in detection efficiency and detection accuracy;
(3) The online detection system and method for the cleanliness of the hydraulic system can realize automatic online detection of the cleanliness of the hydraulic system to be detected, and are simple to operate, high in detection efficiency, low in detection cost and unlimited in detection medium.
Drawings
FIG. 1 is a schematic diagram of the internal structure of an online detection device for the cleanliness of a hydraulic system in an embodiment;
FIG. 2 is an explosion structure diagram of the online cleanliness detection device for the hydraulic system in the embodiment;
FIG. 3 is a schematic structural view of a filter in the example;
FIG. 4 is a schematic structural diagram of online detection of cleanliness of a hydraulic system in the embodiment;
FIG. 5 is a flowchart illustrating a method for online detection of cleanliness of a hydraulic system according to an embodiment;
labeled as: 1. a first filter sheet; 2. a valve body; 3. a first seal ring; 4. a housing; 5. a second seal ring; 6. an intake valve spring; 7. an air inlet valve; 8. a third seal ring; 9. a liquid inlet valve body; 10. a fifth seal ring; 11. a liquid inlet valve steel ball; 12. a fourth seal ring; 13. a liquid inlet valve spring; 14. a liquid inlet; 15. an air inlet; 16. a sixth seal ring; 17. a liquid discharge port; 18. a special-shaped flow channel; 19. a transverse bore; 20. a second filter sheet; 21. a fourth filter sheet; 22. a fifth filter sheet; 23. a filter body cover; 24. a filter body; 25. a third filter sheet; 26. a first pressure ring; 27. a second pressure ring; 28. a third pressure ring; 29. a fourth compression ring; 30. an air inlet check valve; 31. a liquid inlet check valve; 32. a metal skeleton; 33. a wire mesh; 34. a filtration membrane; 35. a liquid inlet cavity; 36. an air inlet cavity; 37. a liquid outlet cavity; 38. and (6) a vertical hole.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 3, the present embodiment provides an online cleanliness detection device for a hydraulic system, which includes a housing 4 and a filter 24.
The valve body 2 is arranged in the shell 4, and the shell 4 is provided with a liquid inlet cavity 35, a gas inlet cavity 36 and a liquid outlet cavity 37 which are communicated with the valve body 2. The housing 4 is provided with an air inlet 15 communicated with the air inlet chamber 36, and the air inlet 15 is used for connecting an air pump so that air blown out by the air pump enters the valve body 2. An air inlet one-way valve 30 is installed in the air inlet cavity 36, the air inlet one-way valve 30 is communicated along the direction from the air inlet 15 to the valve body 2, a liquid inlet one-way valve 31 is installed in the liquid inlet cavity 35, and the liquid inlet one-way valve 31 is communicated along the direction from the liquid inlet cavity 35 to the valve body 2.
The valve body 2 is provided with a special-shaped flow passage 18 for communicating the air inlet cavity 36 and the liquid outlet cavity 37, a transverse hole 19 communicated with the special-shaped flow passage 18 and a vertical hole 38 communicated with the transverse hole 19, and the vertical hole 38 is communicated with the liquid inlet cavity 35 to realize the communication between the air inlet cavity 36 and the liquid outlet cavity 37 and between the liquid inlet cavity 35 and the liquid outlet cavity 37. The cross section of the special-shaped flow passage 18 is in a splayed shape extending along the axial direction of the valve body 2, so that gas or liquid can flow conveniently. A first sealing ring 3 and a second sealing ring 5 are further arranged between the valve body 2 and the shell 4, the first sealing ring 3 is positioned between the liquid inlet cavity 35 and the liquid outlet cavity 37, and oil in the liquid inlet cavity 35 is prevented from leaking; the second sealing ring 5 is located between the gas inlet chamber 36 and the liquid inlet chamber 35, and prevents gas in the gas inlet chamber 36 and oil in the liquid inlet chamber 35 from leaking.
The air inlet one-way valve 30 comprises an air inlet valve 7 and an air inlet valve spring 6, one end of the air inlet valve spring 6 is connected with the valve body 2, the other end of the air inlet valve spring 6 is connected with the tail of the air inlet valve 7, the shape of the head of the air inlet valve 7 is matched with the shape of the air inlet 15, the air inlet 15 can be sealed, and a third sealing ring 8 is arranged between the air inlet valve 7 and the air inlet 15. The intake check valve 30 functions to: in the stage of blowing gas into the gas inlet 15, when the pressure of the gas entering from the gas inlet 15 is higher than the sum of the pretightening force of the gas inlet valve spring 6 and the gas pressure inside the valve body 2, the gas inlet valve spring 6 is compressed, the gas inlet check valve is opened, and the gas can enter the inside of the valve body 2 through the gas inlet check valve; when the air blowing is completed, the air pressure at the air inlet 15 is lower than the sum of the pretightening force of the air inlet valve spring 6 and the air pressure inside the valve body 2, then the air inlet valve spring 6 cannot be compressed, the air inlet one-way valve is closed, the air inlet valve 7 and the third sealing ring 8 play a sealing role at the air inlet 15, the air does not enter the valve body 2 from the air inlet 15 any more, and the air inside the valve body 2 cannot be discharged from the air inlet 15.
The liquid inlet check valve 31 comprises a liquid inlet valve body 9, a liquid inlet valve steel ball 11 and a liquid inlet valve spring 13, the liquid inlet valve body 9 is detachably connected with the shell 4, a fourth sealing ring 12 is arranged between the liquid inlet valve body 9 and the shell 4, the liquid inlet valve body 9 is provided with a liquid inlet 14 communicated with the liquid inlet cavity 35, the liquid inlet valve steel ball 11 is arranged in the liquid inlet valve body 9 and can block the liquid inlet 14, a fifth sealing ring 10 is arranged between the liquid inlet valve steel ball 11 and the liquid inlet 14, one end of the liquid inlet valve spring 13 is connected with the liquid inlet valve steel ball 11, and the other end of the liquid inlet valve spring 13 is connected with the inner wall of the liquid inlet cavity 35. The liquid inlet check valve 31 has the functions of: when the pressure of the liquid inlet 14 is higher than the sum of the pretightening force of the liquid inlet valve spring 13 and the internal pressure of the valve body 2, the liquid inlet valve spring 13 is compressed, the liquid inlet check valve is opened, and the oil liquid of the hydraulic system to be tested can flow into the valve body 2 through the liquid inlet 14 and the liquid inlet cavity 35; when the pressure of the liquid inlet 14 is lower than the sum of the pretightening force of the liquid inlet valve spring 13 and the internal pressure of the valve body 2, the liquid inlet valve spring 13 is not compressed any more, the liquid inlet one-way valve is closed, and the liquid inlet valve steel ball 11 is matched with the fifth sealing ring 10 to play a sealing role, so that gas in the valve body 2 is prevented from flowing out of the liquid inlet 14.
The filter body 24 is detachably connected with the shell 4, the inner cavity of the filter body 24 is communicated with the liquid outlet cavity 37, a multi-stage filter sheet is arranged in the filter body 24, and the filtering precision of the filter sheet is gradually reduced along the direction from the part close to the shell 4 to the part far away from the shell 4. The number of the filter sheets and the filtering precision of each stage of filter sheets are installed and set according to the requirements of the referenced cleanliness standard, and after the oil liquid passes through the filter body 24, particles with different sizes are retained on the filter sheets with different filtering precisions.
In this embodiment, five stages of filters are disposed in the filter body 24, namely, the first filter 1, the second filter 20, the third filter 25, the fourth filter 21 and the fifth filter 22, respectively, and the filtering precisions of the first filter 1, the second filter 20, the third filter 25, the fourth filter 21 and the fifth filter 22 are 100 μm, 50 μm, 25 μm, 15 μm and 5 μm, respectively.
The filter sheet comprises a metal framework 32, a double-layer metal wire mesh 33 clamped on the inner side of the metal framework 32 and a filter membrane 34 clamped between the double-layer metal wire mesh 33, wherein the size of an opening of the metal wire mesh 33 is larger than the filtering precision of the filter membrane 34. When the filter membrane 34 is installed, the filter membrane 34 is sandwiched between the double-layer wire mesh 33, and then the wire mesh 33 is clamped in the metal framework 32.
The end part of the filter body 24 is provided with a filter body cover 23, and the filter body cover 23 is provided with a liquid discharge port 17 communicated with the inner cavity of the filter body 24; the filter body 24 is internally provided with multi-stage press rings along the direction from the shell 4 to the filter body cover 23, the number of the press rings is 1 less than that of the filter sheets, and each stage of the filter sheets are respectively arranged between the shell 4 and the first press ring, between two adjacent press rings and between the last press ring and the filter body cover 23.
In this embodiment, a first press ring 26, a second press ring 27, a third press ring 28 and a fourth press ring 29, which have gradually decreasing diameters, are sequentially assembled in the filter body 24 along the direction from the housing 4 to the filter body cover 23, and steps matched with the outer diameters of the press rings are arranged on the inner wall of the filter body 24. The diameter of the first filter sheet 1 is the same as that of the first pressing ring 26 and is arranged between the shell 4 and the first pressing ring 26, the diameter of the second filter sheet 20 is the same as that of the second pressing ring 27 and is arranged between the first pressing ring 26 and the second pressing ring 27, the diameter of the third filter sheet 25 is the same as that of the third pressing ring 28 and is arranged between the second pressing ring 27 and the third pressing ring 28, the diameter of the fourth filter sheet 21 is the same as that of the fourth pressing ring 29 and is arranged between the third pressing ring 28 and the fourth pressing ring 29, and the fifth filter sheet 22 is arranged between the fourth pressing ring 29 and the filter cover 23. When the filter sheets are mounted, the fifth filter sheet 22, the fourth press ring 29, the fourth filter sheet 21, the third press ring 28, the third filter sheet 25, the second press ring 27, the second filter sheet 20, the first press ring 26 and the first filter sheet 1 are sequentially assembled in the filter body 24.
Example 2
As shown in fig. 4, the present embodiment provides an online detection system for cleanliness of a hydraulic system, which includes an electromagnetic switch valve, a flow sensor, an air pump, a control module, and the online detection device for cleanliness of a hydraulic system described in embodiment 1; the liquid inlet one-way valve of the online hydraulic system cleanliness detection device is connected with the electromagnetic switch valve, a flow sensor is connected between the electromagnetic switch valve and the liquid inlet one-way valve and used for monitoring the volume of passing liquid, the air inlet cavity of the online hydraulic system cleanliness detection device is connected with the air pump, the electromagnetic switch valve and the flow sensor are respectively connected with the control module, and the end part of a filter body of the online hydraulic system cleanliness detection device is connected with the liquid container.
Example 3
As shown in fig. 1 and fig. 5, the present embodiment provides a method for online detecting cleanliness of a hydraulic system by using the system described in embodiment 2, including:
step one, assembling a fifth filter disc 22, a fourth press ring 29, a fourth filter disc 21, a third press ring 28, a third filter disc 25, a second press ring 27, a second filter disc 20, a first press ring 26 and a first filter disc 1 in a filter body 24 in sequence, and then connecting the filter body 24 to a shell 4 to complete the assembly of the online detection device for the cleanliness of the hydraulic system.
And step two, connecting the assembled hydraulic system cleanliness online detection device, the electromagnetic switch valve, the flow sensor, the air pump, the control module and the liquid container according to the graph 4, then connecting the assembled hydraulic system cleanliness online detection system into a low-pressure pipeline of the hydraulic system to be detected, and presetting the volume of oil to be extracted in the control module.
Step three, opening an electromagnetic switch valve through a control module, and directly opening a liquid inlet one-way valve if the hydraulic system to be tested has pressure; if the hydraulic system to be tested has no pressure, the air pump is started through the control module, the air inlet one-way valve is opened by pressure air provided by the air pump, the air enters the special-shaped flow passage 18 of the valve body through the air inlet cavity, and then is discharged into the air from the liquid outlet 17 through the filter body 24; at this time, the negative pressure is generated by the high-speed flow of the air in the irregular flow passage 18, and the liquid inlet check valve 31 is opened by the atmospheric pressure.
And step four, the oil liquid in the hydraulic system to be tested enters the filter body 24 through the liquid inlet one-way valve 31, the liquid inlet cavity 35, the vertical hole 38 of the valve body, the transverse hole 19 of the valve body, the special-shaped flow passage 18 of the valve body and the liquid outlet cavity 35, and flows through the five-stage filter sheet in the filter body 24, and the five-stage filter sheet intercepts particles with different size grades.
Step five, after the flow sensor reads the oil volume preset by the control module, closing the electromagnetic switch valve through the control module, and closing the liquid inlet check valve 31 under the action of the liquid inlet valve spring 13; after all the oil in the valve body 2 flows into the liquid container through the filter 24, the air pump is closed, and the air inlet one-way valve 30 is closed under the action of the air inlet valve spring 6.
And step six, disassembling the filter body 24, taking out each stage of filter sheet from the filter body 24, counting the number of particles on the surface of each stage of filter sheet, and calculating the number of particles in each stage in each 100ml of oil.
And step seven, grading the cleanliness of the oil according to the calculation results of the table 1 and the step six.
TABLE 1 NAS cleanliness class Scale tables
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be considered as the protection scope of the present invention.
Claims (9)
1. The online detection system for the cleanliness of the hydraulic system is characterized by comprising an electromagnetic switch valve, a flow sensor, an air pump, a control module and an online detection device for the cleanliness of the hydraulic system;
the online detection device for the cleanliness of the hydraulic system comprises a shell and a filter body;
the valve body is arranged in the shell, the shell is provided with a liquid inlet cavity, an air inlet cavity and a liquid outlet cavity which are communicated with the valve body, an air inlet one-way valve is arranged in the air inlet cavity, and a liquid inlet one-way valve is arranged in the liquid inlet cavity;
the filter body is detachably connected with the shell, an inner cavity of the filter body is communicated with the liquid outlet cavity, a multi-stage filter is arranged in the filter body, and the filtering precision of the filter is gradually reduced along the direction from the filter body to the filter body;
the liquid inlet one-way valve is connected with a hydraulic system to be tested, an electromagnetic switch valve is connected between the liquid inlet one-way valve and the hydraulic system to be tested, a flow sensor is connected between the electromagnetic switch valve and the liquid inlet one-way valve, the air inlet cavity is connected with an air pump, and the air pump, the electromagnetic switch valve and the flow sensor are respectively connected with a control module;
after the flow sensor reads the preset oil volume, the electromagnetic switch valve is closed through the control module, the filter discs at all levels are taken out, the number of particles on the surfaces of the filter discs at all levels is counted after drying, the number of particles at all levels in unit volume oil is obtained, and the oil cleanliness is evaluated.
2. The online detection system for the cleanliness of the hydraulic system according to claim 1, wherein the valve body is provided with a special-shaped flow passage for communicating the air inlet cavity and the liquid outlet cavity, a transverse hole for communicating with the special-shaped flow passage, and a vertical hole for communicating with the transverse hole, and the vertical hole is communicated with the liquid inlet cavity.
3. The online detection system for the cleanliness of the hydraulic system according to claim 1, wherein the housing is provided with an air inlet communicated with an air inlet cavity, the air inlet one-way valve is communicated along the direction from the air inlet to the valve body, and the liquid inlet one-way valve is communicated along the direction from the liquid inlet cavity to the valve body.
4. The online detection system for the cleanliness of the hydraulic system according to claim 3, wherein the air inlet check valve comprises an air inlet valve and an air inlet valve spring, one end of the air inlet valve spring is connected with the valve body, the other end of the air inlet valve spring is connected with the tail part of the air inlet valve, and the shape of the head part of the air inlet valve is matched with that of the air inlet.
5. The online detection system for the cleanliness of the hydraulic system according to claim 3, wherein the liquid inlet check valve comprises a liquid inlet valve body, a liquid inlet valve steel ball and a liquid inlet valve spring, the liquid inlet valve body is detachably connected with the shell, the liquid inlet valve body is provided with a liquid inlet communicated with the liquid inlet cavity, the liquid inlet valve steel ball is arranged in the liquid inlet valve body and can block the liquid inlet, one end of the liquid inlet valve spring is connected with the liquid inlet valve steel ball, and the other end of the liquid inlet valve spring is connected with the inner wall of the liquid inlet cavity.
6. The online detection system for the cleanliness of the hydraulic system according to claim 1, wherein five stages of filters are arranged in the filter body, namely a first filter, a second filter, a third filter, a fourth filter and a fifth filter, and the filtering accuracies of the first filter, the second filter, the third filter, the fourth filter and the fifth filter are 100 μm, 50 μm, 25 μm, 15 μm and 5 μm respectively.
7. The online detection system for the cleanliness of the hydraulic system according to claim 1, characterized in that a filter body cover is mounted at the end of the filter body, and the filter body cover is provided with a liquid discharge port communicated with an inner cavity of the filter body; the filter body is equipped with multistage clamping ring along the direction of casing to filter body lid in, the quantity of clamping ring is less than 1 of the quantity of cassette, the cassette is located respectively between casing and the first clamping ring, between two adjacent clamping rings and between last clamping ring and the filter body lid.
8. The online detection system for the cleanliness of the hydraulic system according to claim 1, wherein the filter plate comprises a metal framework, a double-layer wire mesh clamped inside the metal framework and a filter membrane clamped between the double-layer wire mesh, and the opening size of the wire mesh is larger than the filtering precision of the filter membrane.
9. A method for online detection of the cleanliness of a hydraulic system by using the online detection system of the cleanliness of the hydraulic system of any one of claims 1 to 8, is characterized by comprising the following steps:
connecting the online detection system of the cleanliness of the hydraulic system to a hydraulic system to be detected;
the electromagnetic switch valve is opened through the control module, and if the hydraulic system to be tested has pressure, the liquid inlet one-way valve is directly opened; if the hydraulic system to be measured has no pressure, the air pump is opened through the control module, and the liquid inlet one-way valve is opened by utilizing the negative pressure generated by the gas flowing through the valve body;
oil in the hydraulic system to be tested enters the filter body after passing through the liquid inlet check valve, the liquid inlet cavity, the valve body and the liquid outlet cavity and flows through the multistage filter discs in the filter body, and the filter discs at each stage intercept particulate matters with different size grades;
after the flow sensor reads the preset oil volume, closing the electromagnetic switch valve through the control module;
and taking out the filter discs at all levels, drying, and counting the number of particles on the surfaces of the filter discs at all levels to obtain the number of particles in unit volume of oil, and evaluating the cleanliness of the oil.
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| CN1031069C (en) * | 1989-09-25 | 1996-02-21 | 盖特诺·拉索 | Improved method for purifying oil |
| DE102012021843A1 (en) * | 2012-10-26 | 2014-04-30 | Hydac Filtertechnik Gmbh | Hydraulic system with at least one hydrostatic displacement unit |
| CN103335201B (en) * | 2013-06-27 | 2016-06-22 | 西安交通大学苏州研究院 | A kind of intelligent hydraulic station |
| CN212941705U (en) * | 2020-07-07 | 2021-04-13 | 西安科控润滑油有限公司 | Lubricating oil viscosity, cleanliness on-line monitoring oil purification equipment |
| CN113281385B (en) * | 2021-05-24 | 2022-02-18 | 无锡职业技术学院 | Portable air blowing type alcohol concentration measuring device and measuring method |
| CN113309762A (en) * | 2021-06-25 | 2021-08-27 | 三一重机有限公司 | Hydraulic oil cleanliness monitoring method, device and monitoring equipment |
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