CN113358853A - Portable hydraulic system oil gas content on-line automatic detection device - Google Patents
Portable hydraulic system oil gas content on-line automatic detection device Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 239000010729 system oil Substances 0.000 title claims description 11
- 239000002245 particle Substances 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 105
- 239000012530 fluid Substances 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000003063 flame retardant Substances 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 239000002253 acid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- 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—Specific substances contained in the oils or fuels
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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—Specific substances contained in the oils or fuels
- G01N33/2847—Water in oils
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Abstract
An online automatic detection device for oil gas content of a portable hydraulic system 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, which is 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 a quick-change connector of a control valve group part of the device passes through a hose and is a second electromagnetic switch valve, the other path of the quick-change connector is a pressure reducing valve connected with a first electromagnetic switch valve in series, the two paths of the quick-change connector are connected in parallel and then are 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 for all electrical elements, the pressure sensor and the temperature sensor are connected with the closed cavity, the oil quality detection sensor is connected with the oil circuit at the front section 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 online detection technology of oil gas content of a hydraulic system, in particular to a portable online automatic detection device of oil gas content of the hydraulic system.
Background
In the design, use and maintenance process of a hydraulic system, gas is always mixed in hydraulic oil due to various factors, and the system is seriously influenced. Experiments show that 6-10% of air is dissolved in 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 amount of bubbles are involved in the impact of the rapidly flowing oil on the liquid level; for the walking machinery, the oil tank is often in shaking, so that more bubbles are rolled into the system during oil return; the creation of localized cavitation in certain components of a hydraulic system can produce large quantities of gas that can remain in the form of tiny bubbles for long periods of time within the system. In addition, many human factors can cause the air content in the hydraulic system to increase.
The gas content is an important pollution index of the hydraulic oil, and when the gas content exceeds a certain value, the gas content can generate non-negligible influence on a hydraulic system, such as reduction of the elastic modulus of the hydraulic oil and reduction of the stability of the system; cavitation and cavitation are generated to cause local high temperature and high pressure of the system, and the aging of the oil liquid is accelerated; reducing system efficiency, causing noise and vibration; accelerating the aging and deterioration of the oil liquid, and the like.
Most present gassiness volume detecting instrument adopts the vacuum pump as the power supply, and drive mechanism is complicated, and the operation degree of difficulty is big, and it is not high to measure the accuracy, and is bulky, weight overweight, difficult carrying, and mostly off-line measuring. The FES-AMD oil gas content detector of the American BarDyne company extracts an oil sample in a piston vacuumizing mode and separates oil from liquid by generating negative pressure through piston movement, the volume is small, but the detection process needs a large amount of manual operation, the automation degree is low, and the measurement error is large. Air-X gas content detection equipment of DSI company of Belgian measures the gas content in oil by using X-rays, but the detection precision is related to the detection time, and the longer the detection time, the higher the precision and the higher the price. The CGS on-line detection instrument of the German Flucon company calculates the gas content of oil liquid through the complex impedance change of the gas-free medium, but the instrument needs to be calibrated by using the gas-free medium before use, and is expensive. Most of domestic oil gas content detection instruments are based on a vacuum differential pressure method in DL/T423-2009, mainly comprise a ZHYQ3502 portable insulating oil gas content full-automatic determinator of Shandong Zhonghui instruments, an LYQH-3000 insulating oil gas content tester of Shanghai Yangyang electrical apparatus technology, an SDHQL insulating oil gas content determinator of Yangzhou Su electrical power, a JZ-HQ insulating oil gas content determinator of Beijing Jiuzhou Chengxin technology and the like, the detection range of the instruments is 0.1% -10%, the single detection time is about 7min, and part of the instruments need to be sampled offline. The invention relates to an on-line gas content detection device [ application number 201310494701.0] for a hydraulic system, and provides an oil gas content detection device based on a DL/T423-2009 vacuum differential pressure method. The invention patent 'portable hydraulic system air content measuring device [ application number 201510200282.4 ]' provides an oil gas content detection device based on a vacuum differential pressure method, but the device can only sample and detect low-pressure (less than 1 MPa) media and has low applicability. The invention discloses a transmission mechanism for imbibing and vacuumizing a gas content measuring instrument [ application number 201710262075.0], which adopts a bevel gear pair, a ball screw and the like to form the transmission mechanism, the operation process is manual operation, and the automation degree is low.
Disclosure of Invention
The invention aims to provide a portable online automatic detection device for oil gas content of 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 4 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 stepping motor 8 to act, and the first linear bearing 6 and the second linear bearing 10 are arranged at the 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 that the pressure reducing valve 20 is connected with the first electromagnetic switch valve 21 in series, the two paths are 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 is composed of a power supply 12, an oil 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 for all electrical elements, the pressure sensor 28 and the temperature sensor 27 are connected with the closed cavity 1, the oil quality detection sensor 25 is connected with a front-section oil circuit of the particle filter 26 in parallel, the pressure sensor 28, the temperature sensor 27, the oil quality detection sensor 25 and the 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 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 path of low-pressure oil, and the pressure reducing valve 20, the first electromagnetic switch valve 21 and the particle filter 26 are sequentially connected to form a sampling oil path of high-pressure oil, so that the online detection of the oil gas content of a high-pressure system and a low-pressure system is realized, the application environment is wide, and the practicability is strong.
2) The invention carries out programming control and signal acquisition and processing on each electromagnetic valve, sensor, motor driver and the like of the gas content detection device through the microcontroller 15, realizes the automation of oil gas content detection, can be automatically completed, can also be manually intervened, and has stronger practicability.
3) Besides the detection of the gas content of the oil, the oil quality detection sensor 25 is added, so that the gas content of the oil sample can be detected, and the oxidant and water content, acid value, alkali value, particle number and viscosity change of the oil sample can be detected on line.
3) The invention realizes the miniaturization and 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, convenient carrying and the like.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the present invention. Description of reference numerals: 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 connector 18, a hose 19, a pressure reducing valve 20, a first electromagnetic switch valve 21, a second electromagnetic switch valve 22, a connector 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 fig. 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 4 are arranged in the closed cavity 1, the part of the rack 5 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 stepping motor 8 to act, and the first linear bearing 6 and the second linear bearing 10 are arranged at two sides of the meshed 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 that the pressure reducing valve 20 is connected with the first electromagnetic switch valve 21 in series, the two paths are 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 is composed of a power supply 12, an oil 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 for all electrical elements, the pressure sensor 28 and the temperature sensor 27 are connected with the closed cavity 1, the oil quality detection sensor 25 is connected with a front-section oil circuit of the particle filter 26 in parallel, the pressure sensor 28, the temperature sensor 27, the oil quality detection sensor 25 and the 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 mounting fitting surface of the piston 4 and the closed cavity 1 is provided with a two-way 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 conveniently, and the closed cavity 1 cannot leak oil or gas.
The piston 4 is coaxially in 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 ensured to be coaxial with the closed cavity 1 in the motion process.
The oil quality detection sensor 25 is connected in parallel with the oil way at the front section of the particle filter 26 in a threaded insertion connection mode, the oil quality detection sensor 25 is suitable for most mineral oil, synthetic oil and semisynthetic oil, and the detection contents are 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 the industry standard DL/T423-2009.
The hydraulic system oil is petroleum-based hydraulic oil and phosphate-based flame-retardant hydraulic oil.
The pressure of waiting to examine fluid 17 decides opening and close of first electromagnetic switch valve 21 and second electromagnetic switch valve 22, wait to examine that fluid 17 gets into closed cavity 1 through second electromagnetic switch valve 22 when being low pressure (being less than 1 MPa), fluid when high pressure (more than or equal to 1 MPa) gets into closed cavity 1 through first electromagnetic switch valve 21 after reducing valve 20 reduces the fluid pressure (being less than 1 MPa).
The specific implementation working process of the invention is as follows: as shown in fig. 1, the piston 4 of the air content detection device is located at the leftmost end of the closed cavity 1 before measurement, no medium is 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 a hydraulic system, the pressure of oil to be detected in the region is measured. A reserved interface (a quick-change connector or a threaded plug) is generally arranged in a to-be-detected area of a hydraulic system, and a pressure detection device (such as a pressure gauge, a pressure sensor and the like) is connected into the reserved interface to measure the oil pressure of the to-be-detected area. During working, the gas content detection device is firstly connected to a reserved interface of a to-be-detected area of the hydraulic system through the quick-change connector 14, and if the oil liquid 17 to be detected is low-pressure oil liquid (less than 1 MPa), the second electromagnetic switch valve 22 is opened, and the to-be-detected oil liquid 13 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, and the oil to be measured 17 is introduced 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. Before the oil liquid 17 to be detected passes through the particle filter 26, the oil liquid quality detection sensor 29 can detect the oxidant and water content, acid value, alkali value, particle number and viscosity change of the oil liquid. After the oil liquid 17 to be detected is communicated with the closed cavity 1, the stepping motor 8 is started, the piston 4 is driven to move rightwards through the meshing of the gear 7 and the rack 5, oil liquid starts to be sucked, the displacement sensor 11 detects the displacement of the piston 4 in the oil suction process so as to obtain the volume of the sucked oil liquid, and the stepping motor 8 is stopped after the volume of the sucked oil liquid meets the requirement. At this moment, the oil in the seal cavity 1 is not filled, and some air cavities exist, so the exhaust is needed, the oil to be detected is made to be filled in the required volume of the left end of the seal cavity 1, the second electromagnetic switch valve 22 (low-pressure oil) 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 2 is made to slowly move leftwards until the left side cavity of the piston 4 is filled with the 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. So far, the suction and the exhaust of the oil to be detected are finished. Next, vacuumizing is performed, the stepping motor 8 is started and moves rightwards at a certain speed for a certain distance 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 temperature and the pressure are 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 calculates a formula according to the oil gas content based on a vacuum differential pressure method
And (6) obtaining the gas content of the oil liquid to be detected. In the formula (1)GThe gas content of the oil liquid is the same as the gas content of the oil liquid,V gs the volume of the gas in the oil liquid to be detected,V o the volume of the oil liquid to be detected is,V po is composed ofVolume of pure oil. In the oil gas content detection device, due to the extra volumes of the flow passages such as the sensor joint, the oil inlet and the oil outlet, and the like, and 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 into according to an ideal gas state equation:
in the formula (2), the first and second groups,p 1、T 1、x 1the pressure, the temperature and the piston displacement in the sealed cavity 1 are realized when the oil sampling is finished;p 2、T 2、x 2in order to complete the pressure, temperature and piston displacement in the sealed cavity 1 when oil-gas is completely separated after vacuum pumping,x’is the equivalent length of the flow channel volume;dpis composed ofp 1The error in the measured value is such that,dTis composed ofT 1Errors in the measured values, which are inherent deviations of the measurements;K e the effective bulk modulus of the oil;β T the thermal expansion coefficient of the oil is shown. When the actual gas content detection device calculates the program, it is not limited to the calculation form of formula (2), and there may be other forms and correction parameters according to the actual working conditions and problems, but all should be converted based on the vacuum differential pressure method. The display 14 displays parameters of oil temperature, pressure and gas content, and parameters of oil products such as oxidant and water content, acid value, base number, particle number and viscosity change of oil liquid in real time, and the obtained data can be output through the data output unit 13. And finally, opening a third electromagnetic switch valve 24, starting the stepping motor 8, moving the piston 4 leftwards, removing oil in the sealed cavity 1, and connecting the joint 23 to the original system or other oil recovery devices. In the whole process from hydraulic suction, exhaust, vacuum pumping to oil liquid removal, all the actions of the electrical elements are programmed and controlled by the microcontroller, manual operation is not needed, and manual intervention is needed, and manual operation can be carried out through buttons on the microcontroller.
When the method is used for measuring the gas content of the oil, the influence of the temperature and the elastic modulus of the oil 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 function richness of the device and the comprehensiveness of oil detection.
The foregoing detailed description is intended to illustrate and not limit the invention, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the invention are intended to be covered by the following claims.
Claims (6)
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 stepping motor (8) to act, 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 that the pressure reducing valve (20) is connected with the first electromagnetic switch valve (21) in series, the two paths are connected in parallel and then connected with a 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 installed at the top of the closed cavity (1); the microcomputer control part of the device is composed of a power supply (12), an oil 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 for all electrical elements, the pressure sensor (28) and the temperature sensor (27) are connected with a closed cavity (1), the oil quality detection sensor (25) is connected with a front-section oil way of a particle filter (26) in parallel, the pressure sensor (28), the temperature sensor (27), the oil quality detection sensor (25), a displacement sensor (11) is connected with the microcontroller (15) through the signal acquisition and conversion unit (16), a first electromagnetic switch valve (21), a second electromagnetic switch valve (22), a third electromagnetic switch valve (25), a fourth electromagnetic switch valve (29), The motor driver (9) is connected with the microcontroller (15).
2. The portable hydraulic system oil gas content online automatic detection device according to claim 1, characterized in that: the piston (4) and the matching surface of the closed cavity (1) are provided with a two-way sealing ring (2) and a guide belt (3), wherein the closed cavity (1) is of a cylindrical structure.
3. The portable hydraulic system oil gas content online automatic detection device according to claim 1, characterized in that: the piston (4) is coaxially in 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).
4. The portable hydraulic system oil gas content online automatic detection device according to claim 1, characterized in that: the oil quality detection sensor (25) is connected with the oil circuit at the front section 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, characterized in that: the hydraulic system oil is petroleum-based hydraulic oil and phosphate-based flame-retardant hydraulic oil.
6. The portable hydraulic system oil gas content online automatic detection device according to claim 1, characterized in that: wait to examine the pressure of fluid (17) and decide opening and close of electric first magnetic switch valve (21) and second electromagnetic switch valve (22), wait to examine fluid (17) and be the low pressure, fluid gets into closed cavity (1) through second electromagnetic switch valve (22) when being less than 1MPa promptly, during the high pressure, during more than or equal to 1MPa promptly, fluid passes through relief pressure valve (20) and reduces fluid pressure, get into closed cavity (1) through first electromagnetic switch valve (21) after being less than 1MPa promptly.
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| CN202110675589.5A CN113358853B (en) | 2021-06-18 | 2021-06-18 | Portable hydraulic system fluid gas content on-line automatic checkout device |
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| CN202110675589.5A CN113358853B (en) | 2021-06-18 | 2021-06-18 | Portable hydraulic system fluid gas content on-line automatic checkout device |
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|---|---|---|---|---|
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