CN113358853B - Portable hydraulic system fluid gas content on-line automatic checkout device - Google Patents
Portable hydraulic system fluid gas content on-line automatic checkout device Download PDFInfo
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- CN113358853B CN113358853B CN202110675589.5A CN202110675589A CN113358853B CN 113358853 B CN113358853 B CN 113358853B CN 202110675589 A CN202110675589 A CN 202110675589A CN 113358853 B CN113358853 B CN 113358853B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
- G01N33/2847—Water in oil
Abstract
The portable hydraulic system oil liquid gas content online automatic detection device is characterized in that a piston and a rack fixedly connected with the piston are arranged in a closed cavity of a mechanical part, the part of the rack positioned outside the closed cavity is meshed with a gear and is connected with a displacement sensor, and the gear is connected with a stepping motor controlled by a motor driver; one path of quick-change connector of the control valve group part of the device is a second electromagnetic switch valve after passing through a hose, the other path of quick-change connector is a pressure reducing valve connected with the first electromagnetic switch valve in series, the two paths of quick-change connector are connected in parallel and then connected into a closed cavity through a particle filter, the connector is connected into the closed cavity through a third electromagnetic switch valve, and a fourth electromagnetic switch valve is arranged at the top of the closed cavity; the power supply of the microcomputer control part supplies power to all electrical elements, the pressure sensor and the temperature sensor are connected with the closed cavity, the oil liquid quality detection sensor is connected with the front section oil circuit of the particle filter in parallel, the four sensors are connected with the microcontroller through the signal acquisition and conversion unit, and the four electromagnetic switch valves and the motor driver are connected with the microcontroller.
Description
Technical Field
The invention relates to an on-line detection technology for oil gas content of a hydraulic system, in particular to a portable on-line automatic detection device for oil gas content of the hydraulic system.
Background
During the design, use and maintenance of hydraulic systems, various factors can always cause the mixing of gases in the hydraulic oil, which can have serious impact on the system. Experiments show that 6% -10% of air is dissolved in the common hydraulic oil at normal temperature and normal pressure; the general hydraulic system is an open system, oil in an oil tank is communicated with the atmosphere through an air filter, and when the system returns oil, a large number of bubbles can be involved in the impact of the rapidly flowing oil on the liquid level; for walking machinery, the oil tank is often in shake, which causes the system to be involved in more bubbles when returning oil; when local cavitation occurs in certain components of the hydraulic system, a large amount of gas is evolved, which remains in the system for a long period of time in the form of tiny bubbles. In addition, many human factors can lead to an increase in air content in the hydraulic system.
The air content is an important pollution index of hydraulic oil, and when the air content exceeds a certain value, the air content can generate non-negligible influence on a hydraulic system, such as reducing the elastic modulus of oil liquid and reducing the stability of the system; cavitation and cavitation are generated to cause local high temperature and high pressure of the system and accelerate the aging of oil; reducing system efficiency, causing noise and vibration; accelerating the aging and deterioration of oil.
Most of the existing gas-content detection instruments adopt a vacuum pump as a power source, and the transmission mechanism is complex, has high operation difficulty, low measurement accuracy, large volume, overweight weight and difficult carrying, and is mostly used for off-line detection. The FES-AMD oil gas content detector of BarDyne company in the United states extracts oil samples in a piston vacuumizing mode and generates negative pressure through piston movement to separate oil, is small in size, but needs a large amount of manual operation in the detection process, is low in automation degree and large in measurement error. Air-X gas content detection equipment of Belgium DSI company utilizes X-ray to measure the gas content in oil liquid, but the detection precision is related to the detection time, and the longer the detection time is, the higher the precision is and the price is high. The CGS on-line detecting instrument of the Germany Flucon company calculates the gas content of the oil liquid through the complex impedance change with the medium without gas, but the instrument needs to be calibrated by using the medium without gas before use and is expensive. The domestic oil gas content detection instrument is mainly based on a vacuum pressure difference method in DL/T423-2009, and mainly comprises a full-automatic measuring instrument for the gas content of ZHYQ3502 of Shandong Zhonghui instrument, a LYQH-3000 insulating oil gas content measuring instrument for Shanghai Laiyang electric appliance technology, an SDHQL insulating oil gas content measuring instrument for Yangzhou Su electric technology, a JZ-HQ insulating oil gas content measuring instrument for Beijing Jiuzhou Chengxin technology and the like, wherein the detection range of the instruments is 0.1% -10%, the single detection time is about 7min, and partial instruments need offline sampling. The invention discloses an online gas content detection device for a hydraulic system [ application number 201310494701.0] and provides an oil gas content detection device based on a DL/T423-2009 vacuum pressure difference method, wherein an exhaust pump and a vacuum pump are arranged to complete the vacuumizing and exhausting processes, the volume and the weight of the device are increased, and the portability and the implementation of the device are poor. The invention patent 'portable hydraulic system air content measuring device [ application number 201510200282.4 ]' provides an oil liquid air content detecting device based on a vacuum pressure difference method, but the device can only sample and detect low-pressure (less than 1 MPa) media, and has low applicability. The invention provides a transmission mechanism for sucking and vacuumizing an air content measuring instrument [ application number 201710262075.0], which adopts a transmission mechanism formed by a bevel gear pair, a ball screw and the like, and has the advantages of manual operation in the operation process and low automation degree.
Disclosure of Invention
The invention aims to provide a portable oil gas content online automatic detection device for a hydraulic system.
The invention relates to a portable hydraulic system oil gas content online automatic detection device, the mechanical part of the device is composed of a closed cavity 1, a piston 4, a rack 5, a gear 7, a stepping motor 8, a motor driver 9, a displacement sensor 11, a first linear bearing 6 and a second linear bearing 10, wherein the piston 4 and the rack 5 fixedly connected with the piston are arranged in the closed cavity 1, the part of the rack 5 positioned outside the closed cavity 1 is meshed with the gear 7, the end part of the rack 5 is connected with the displacement sensor 11, the gear 7 is connected with the stepping motor 8, the motor driver 9 controls the action of the stepping motor 8, and the first linear bearing 6 and the second linear bearing 10 are arranged at two sides of the meshing part of the rack 5 and the gear 7; the control valve group part of the device consists of a quick-change connector 18, a hose 19, a pressure reducing valve 20, a first electromagnetic switch valve 21, a second electromagnetic switch valve 22, a particle filter 26, a third electromagnetic switch valve 24, a connector 23 and a fourth electromagnetic switch valve 29, wherein the quick-change connector 18 is divided into two paths after passing through the hose 19, one path is the second electromagnetic switch valve 22, the other path is the pressure reducing valve 20 connected with the first electromagnetic switch valve 21 in series, the two paths are connected with the closed cavity 1 after being connected in parallel and then connected with the closed cavity 1 through the particle filter 26, the connector 23 is connected with the closed cavity 1 through the third electromagnetic switch valve 24, and the fourth electromagnetic switch valve 29 is arranged at the top of the closed cavity 1; the microcomputer control part of the device consists of a power supply 12, an oil liquid quality detection sensor 25, a temperature sensor 27, a pressure sensor 28, a signal acquisition and conversion unit 16, a microcontroller 15, a display 14 and a data output unit 13, wherein the power supply 12 supplies power to all electrical elements, the pressure sensor 28 and the temperature sensor 27 are connected with the closed cavity 1, the oil liquid quality detection sensor 25 is connected with a front section oil circuit of a particle filter 26 in parallel, the pressure sensor 28, the temperature sensor 27, the oil liquid quality detection sensor 25 and a displacement sensor 11 are connected with the microcontroller 15 through the signal acquisition and conversion unit 16, and the first electromagnetic switch valve 21, the second electromagnetic switch valve 22, the third electromagnetic switch valve 24, the fourth electromagnetic switch valve 29 and the motor driver 9 are connected with the microcontroller 15.
The invention has the beneficial effects that:
1) According to the invention, the quick-change connector 18, the second electromagnetic switch valve 22 and the particle filter 26 are sequentially connected to form a sampling oil way of low-pressure oil liquid, the pressure reducing valve 20, the first electromagnetic switch valve 21 and the particle filter 26 are sequentially connected to form a sampling oil way of high-pressure oil liquid, so that the online detection of the oil gas content of the high-pressure system oil liquid and the low-pressure system oil liquid is realized, the application environment is wide, and the practicability is strong.
2) The invention realizes the automation of the oil gas content detection by programming control and signal acquisition and processing of the electromagnetic valves, the sensors, the motor drivers and the like of the gas content detection device through the microcontroller 15, can be automatically completed, can be manually intervened, and has strong practicability.
3) Besides detecting the gas content of the oil liquid, the invention is added with the oil liquid quality detection sensor 25, so that the change of the oxidant and water content, acid value, base number, particle number and viscosity of the oil sample can be detected on line while the gas content of the oil sample is detected.
3) The invention realizes the miniaturization and the light weight of the device through the compact design of the mechanical part, the integrated installation of the control valve group and the high integration of the microcomputer control part, and has the advantages of small volume, light weight, portability and the like.
Drawings
Fig. 1 is a schematic view of the structural principle of the present invention. Reference numerals illustrate: the device comprises a closed cavity 1, a bidirectional sealing ring 2, a guide belt 3, a piston 4, a rack 5, a first linear bearing 6, a gear 7, a stepping motor 8, a motor driver 9, a second linear bearing 10, a displacement sensor 11, a power supply 12, a data output unit 13, a display 14, a microcontroller 15, a signal acquisition and conversion unit 16, oil to be detected 17, a quick-change joint 18, a hose 19, a pressure reducing valve 20, a first electromagnetic switch valve 21, a second electromagnetic switch valve 22, a joint 23, a third electromagnetic switch valve 24, an oil quality detection sensor 25, a particle filter 26, a temperature sensor 27, a pressure sensor 28 and a fourth electromagnetic switch valve 29.
Detailed Description
As shown in figure 1, the invention is a portable hydraulic system oil gas content online automatic detection device, the mechanical part of the device is composed of a closed cavity 1, a piston 4, a rack 5, a gear 7, a stepping motor 8, a motor driver 9, a displacement sensor 11, a first linear bearing 6 and a second linear bearing 10, wherein the piston 4 and the rack 5 fixedly connected with the piston are arranged in the closed cavity 1, the part of the rack 5 positioned outside the closed cavity 1 is meshed with the gear 7, the end part of the rack 5 is connected with the displacement sensor 11, the gear 7 is connected with the stepping motor 8, the motor driver 9 controls the action of the stepping motor 8, and the first linear bearing 6 and the second linear bearing 10 are arranged on two sides of the meshing part of the rack 5 and the gear 7; the control valve group part of the device consists of a quick-change connector 18, a hose 19, a pressure reducing valve 20, a first electromagnetic switch valve 21, a second electromagnetic switch valve 22, a particle filter 26, a third electromagnetic switch valve 24, a connector 23 and a fourth electromagnetic switch valve 29, wherein the quick-change connector 18 is divided into two paths after passing through the hose 19, one path is the second electromagnetic switch valve 22, the other path is the pressure reducing valve 20 connected with the first electromagnetic switch valve 21 in series, the two paths are connected with the closed cavity 1 after being connected in parallel and then connected with the closed cavity 1 through the particle filter 26, the connector 23 is connected with the closed cavity 1 through the third electromagnetic switch valve 24, and the fourth electromagnetic switch valve 29 is arranged at the top of the closed cavity 1; the microcomputer control part of the device consists of a power supply 12, an oil liquid quality detection sensor 25, a temperature sensor 27, a pressure sensor 28, a signal acquisition and conversion unit 16, a microcontroller 15, a display 14 and a data output unit 13, wherein the power supply 12 supplies power to all electrical elements, the pressure sensor 28 and the temperature sensor 27 are connected with the closed cavity 1, the oil liquid quality detection sensor 25 is connected with a front section oil circuit of a particle filter 26 in parallel, the pressure sensor 28, the temperature sensor 27, the oil liquid quality detection sensor 25 and a displacement sensor 11 are connected with the microcontroller 15 through the signal acquisition and conversion unit 16, and the first electromagnetic switch valve 21, the second electromagnetic switch valve 22, the third electromagnetic switch valve 25, the fourth electromagnetic switch valve 29 and the motor driver 9 are connected with the microcontroller 15.
The installation mating surface of the piston 4 and the closed cavity 1 is provided with a bidirectional sealing ring 2 and a guide belt 3, wherein the closed cavity 1 is of a cylindrical structure, so that the piston 4 and the inner wall of the closed cavity 1 can be reliably sealed, and the closed cavity 1 cannot leak oil and gas.
The piston 4 is in coaxial threaded connection with the rack 5, and the axes of the first linear bearing 6 and the second linear bearing 10 are coaxial with the rack 5 and the piston 4, so that the piston 4 is coaxial with the closed cavity 1 in the moving process.
The oil quality detection sensor 25 is connected with the front section oil way of the particle filter 26 in parallel in a threaded plug-in connection mode, and the oil quality detection sensor 25 is applicable to most mineral oil, synthetic oil and semisynthetic oil, and the detection content is the oxidant and water content, acid value, alkali value, particle number and viscosity change of the oil.
The gas content detection device is based on an industry standard DL/T423-2009.
The hydraulic system oil is petroleum-based hydraulic oil and phosphate-based flame-retardant hydraulic oil.
The pressure of the oil liquid 17 to be detected determines the opening and closing of the first electromagnetic switch valve 21 and the second electromagnetic switch valve 22, when the oil liquid 17 to be detected is at low pressure (less than 1 MPa), the oil liquid enters the closed cavity 1 through the second electromagnetic switch valve 22, and when the oil liquid is at high pressure (more than or equal to 1 MPa), the oil liquid reduces the pressure of the oil liquid (less than 1 MPa) through the pressure reducing valve 20, and then enters the closed cavity 1 through the first electromagnetic switch valve 21.
The specific implementation working process of the invention is as follows: as shown in fig. 1, the piston 4 of the gas content detection device before measurement is positioned at the leftmost end of the closed cavity 1, no medium exists in the closed cavity 1, and the first electromagnetic switch valve 21, the second electromagnetic switch valve 22, the third electromagnetic switch valve 24 and the fourth electromagnetic switch valve 29 are all in a closed state. When the gas content detection device is connected to a region to be detected of the hydraulic system, the pressure of oil to be detected in the region is measured. The hydraulic system is generally provided with a reserved interface (quick-change connector or threaded plug) in the region to be detected, and a pressure detection device (such as a pressure gauge, a pressure sensor and the like) is connected to the reserved interface to measure the oil pressure in the region to be detected. When the hydraulic system is in operation, the gas content detection device is connected to a reserved interface of a to-be-detected area of the hydraulic system through the quick-change connector 18, if the to-be-detected oil 17 is low-pressure oil (less than 1 MPa), the second electromagnetic switch valve 22 is opened, and the to-be-detected oil 17 is introduced into the closed cavity 1 through the hose 19, the second electromagnetic switch valve 22 and the particle filter 26 in sequence; if the oil is high-pressure oil (more than or equal to 1 MPa), the first electromagnetic switch valve 21 is opened to introduce the oil 17 to be detected into the closed cavity through the hose 19, the pressure reducing valve 20, the first electromagnetic switch valve 21 and the particle filter 26 in sequence. The oxidant and water content, acid value, base number, particle number and viscosity change of the oil to be measured 17 can be detected by the oil quality detection sensor 29 before the oil passes through the particle filter 26. After the oil to be detected 17 is communicated with the closed cavity 1, the stepping motor 8 is started, the piston 4 is driven to move rightwards through the engagement of the gear 7 and the rack 5, oil is sucked, the displacement of the piston 4 is detected by the displacement sensor 11 in the oil suction process, the volume of sucked oil is further obtained, and the stepping motor 8 is stopped after the volume of sucked oil reaches the requirement. At this time, the oil in the closed cavity 1 is not filled, and some air cavities exist, so that air needs to be exhausted, the oil to be detected is filled with the required volume at the left end of the closed cavity 1, the second electromagnetic switch valve 22 (low-pressure oil) is closed or the first electromagnetic switch valve 21 (high-pressure oil) is closed, the fourth electromagnetic switch valve 29 is opened, the stepping motor 8 is started, the piston 4 is slowly moved leftwards until the left cavity of the piston 4 is filled with oil and the oil overflows from the third electromagnetic switch valve 24, the stepping motor 8 is stopped, and the fourth electromagnetic switch valve 29 is closed. Thus, the suction and the exhaust of the oil to be detected are completed. Next, vacuumizing is carried out, the stepping motor 8 is started and moves rightwards for a certain distance at a certain speed under the control of the motor driver 9, in the moving process, the temperature sensor 27 and the pressure sensor 28 respectively monitor the temperature and the pressure of the oil in the sealed cavity 1 in real time, the oil is input into the microcontroller 15 through the signal acquisition and conversion unit 16, the displacement sensor 11 monitors the displacement of the piston 4 in real time and transmits the displacement to the microcontroller, and the microcontroller 15 carries out the calculation formula according to the oil gas content based on a vacuum differential pressure method
（1）
And obtaining the air content of the oil to be detected. In the formula (1)GIs the gas content of the oil liquid,V gs for the volume of the gas in the oil to be detected,V o for the volume of the oil to be detected,V po is thatPure oil volume. In the oil gas content detection device, because of the additional volumes of the sensor joint, the oil inlet and outlet and other flow channels, the change of the gas volume under different pressures and temperatures, the elastic modulus and the thermal expansion factor of the oil are considered, and the formula (1) is corrected according to an ideal gas state equation:
（2）
in the formula (2),p 1 、T 1 、x 1 the pressure, the temperature and the piston displacement in the sealing cavity 1 are used for completing oil sampling;p 2 、T 2 、x 2 for the purpose of sealing the pressure, temperature and piston displacement in the cavity 1 when the complete separation of oil and gas is completed after the vacuum pumping,x’is the equivalent length of the volume of the runner;dpis thatp 1 The error of the measured value is determined,dTis thatT 1 Errors in the measured values, which are the inherent deviations of the measurements;K e is the effective bulk modulus of elasticity of the oil;β T is the thermal expansion coefficient of the oil. When the calculation program of the actual gas content detection device is set, the method is not limited to the calculation form of the formula (2), and other forms and correction parameters can be provided according to the actual working condition and problems, but the method is converted based on a vacuum differential pressure method. The display 14 displays the oil temperature, pressure, gas content parameters, oxidant and water content of the oil, acid value, alkali value, particle number, viscosity change and other oil parameters in real time during the detection process, and the obtained data can be communicatedThe data output unit 13 outputs the data. Finally, the third electromagnetic switch valve 24 is opened, the stepping motor 8 is started, the piston 4 moves leftwards, the oil in the sealed cavity 1 is discharged, and the connector 23 can be connected to an original system or other oil recovery devices. All the electric elements are programmed and controlled by the microcontroller from the hydraulic suction, exhaust and vacuumizing to the final oil removal, and manual operation can be performed by buttons on the microcontroller if manual intervention is needed.
When the gas content of the oil is measured, the influence of the oil temperature and the elastic modulus on the measurement result is considered, and the corresponding correction term is added into the calculation formula, so that the accuracy of gas content detection is ensured.
The invention increases the oil quality function on the basis of oil gas content detection, and improves the richness of the function of the device and the comprehensiveness of oil detection.
The foregoing detailed description is provided to illustrate the present invention and not to limit the invention, and any modifications and changes made to the present invention within the spirit of the present invention and the scope of the appended claims fall within the scope of the present invention.
Claims (5)
1. The utility model provides a portable hydraulic system fluid air content on-line automatic checkout device which characterized in that: the mechanical part of the device consists of a closed cavity (1), a piston (4), a rack (5), a gear (7), a stepping motor (8), a motor driver (9), a displacement sensor (11), a first linear bearing (6) and a second linear bearing (10), wherein the piston (4) and the rack (5) fixedly connected with the piston are arranged in the closed cavity (1), the part of the rack (5) positioned outside the closed cavity (1) is meshed with the gear (7), the end part of the rack (5) is connected with the displacement sensor (11), the gear (7) is connected with the stepping motor (8), the motor driver (9) controls the action of the stepping motor (8), and the first linear bearing (6) and the second linear bearing (10) are arranged on two sides of the meshing part of the rack (5) and the gear (7); the control valve group part of the device consists of a quick-change connector (18), a hose (19), a pressure reducing valve (20), a first electromagnetic switch valve (21), a second electromagnetic switch valve (22), a particle filter (26), a third electromagnetic switch valve (24), a connector (23) and a fourth electromagnetic switch valve (29), wherein the quick-change connector (18) is divided into two paths after passing through the hose (19), one path is the second electromagnetic switch valve (22), the other path is the pressure reducing valve (20) and the first electromagnetic switch valve (21) in series connection, the two paths are connected with the closed cavity (1) through the particle filter (26) after being connected in parallel, the connector (23) is connected with the closed cavity (1) through the third electromagnetic switch valve (24), and the fourth electromagnetic switch valve (29) is arranged at the top of the closed cavity (1); the microcomputer control part of the device consists of a power supply (12), an oil liquid quality detection sensor (25), a temperature sensor (27), a pressure sensor (28), a signal acquisition and conversion unit (16), a microcontroller (15), a display (14) and a data output unit (13), wherein the power supply (12) supplies power to all electrical elements, the pressure sensor (28) and the temperature sensor (27) are connected with a closed cavity (1), the oil liquid quality detection sensor (25) is connected with an oil way at the front section of a particle filter (26) in parallel, the pressure sensor (28), the temperature sensor (27), the oil liquid quality detection sensor (25) and a displacement sensor (11) are connected with a microcontroller (15) through a signal acquisition and conversion unit (16), a first electromagnetic switch valve (21), a second electromagnetic switch valve (22), a third electromagnetic switch valve (24), a fourth electromagnetic switch valve (29) and a motor driver (9) are connected with the microcontroller (15), the first electromagnetic switch valve (21) and the second electromagnetic switch valve (22) are dependent on the pressure of the oil liquid (17) to be detected, when the pressure to be detected is lower than the first electromagnetic switch valve (21) and the pressure to be limited to be high, the first electromagnetic switch valve (17) is limited to be opened, the first electromagnetic switch valve (21) is opened, and the second electromagnetic switch valve (22) is closed.
2. The portable hydraulic system oil gas content online automatic detection device according to claim 1, wherein: the sealing device is characterized in that a bidirectional sealing ring (2) and a guiding belt (3) are arranged on the matching surface of the piston (4) and the sealing cavity (1), and the sealing cavity (1) is of a cylindrical structure.
3. The portable hydraulic system oil gas content online automatic detection device according to claim 1, wherein: the piston (4) is coaxially connected with the rack (5) through threads, and the axes of the first linear bearing (6) and the second linear bearing (10) are coaxial with the rack (5) and the piston (4).
4. The portable hydraulic system oil gas content online automatic detection device according to claim 1, wherein: the oil liquid quality detection sensor (25) is connected with the front section oil way of the particle filter (26) in parallel in a threaded plug-in connection mode.
5. The portable hydraulic system oil gas content online automatic detection device according to claim 1, wherein: the hydraulic system oil is petroleum-based hydraulic oil and phosphate-based flame-retardant hydraulic oil.
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| CN1336547A (en) * | 2001-06-15 | 2002-02-20 | 燕山大学 | On-line monitor for pollution in hydraulic system oil liquid |
| CN201034909Y (en) * | 2007-01-24 | 2008-03-12 | 贾瑞清 | On-line oil-liquid polluting automatic detection device |
| CN101413521B (en) * | 2008-11-28 | 2011-05-04 | 西安建筑科技大学 | Experimental apparatus and method for obtaining multi-source diagnostic information of hydraulic equipment |
| CN106342199B (en) * | 2010-06-23 | 2014-07-02 | 中国兵器工业集团第七○研究所 | A kind of hydraulic gyration body is from dynamic test, detection control system |
| CN102435545A (en) * | 2011-09-06 | 2012-05-02 | 武汉理工大学 | Portable hydraulic oil particle and moisture detection device |
| CN103713114A (en) * | 2012-09-29 | 2014-04-09 | 成都金福天下投资管理有限公司 | Hydraulic oil test system |
| CN103573752B (en) * | 2013-10-21 | 2015-05-13 | 浙江大学 | On-line air content detection device for hydraulic system |
| CN104792972B (en) * | 2015-04-26 | 2016-04-13 | 浙江大学 | Portable hydraulic system air air content proving installation |
| CN105004854B (en) * | 2015-06-10 | 2017-09-26 | 东南大学 | A kind of lubricating oil gassiness measuring method |
| CN108333279B (en) * | 2018-01-25 | 2021-03-16 | 河南中分仪器股份有限公司 | Online monitoring device for dissolved gas in insulating oil and method for removing gas from insulating oil |
| CN209640150U (en) * | 2019-02-28 | 2019-11-15 | 江苏凯瑞德润滑技术有限公司 | A kind of hydraulic oil particle pollutant testing apparatus |
| CN110043533A (en) * | 2019-04-25 | 2019-07-23 | 兰州理工大学 | The measuring device and method of air separation pressure in contact surface hydraulic oil |
| CN110231462A (en) * | 2019-07-19 | 2019-09-13 | 贵州电网有限责任公司 | It is a kind of to pump out vibration hydraulic oil to detect the device and its application method of air content |
| CN112255579B (en) * | 2020-10-16 | 2023-09-19 | 西华大学 | Test bed |
| CN112461706B (en) * | 2020-11-13 | 2023-06-02 | 广西电网有限责任公司电力科学研究院 | Insulating oil gas content tester calibration device applied to vacuum differential pressure principle |
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