Hydraulic oil dissolved air ultra-vacuum separation device and separation method

Abstract

A hydraulic oil-dissolved air ultra-vacuum separation device and separation method thereof, belonging to the technical field of hydraulic system oil purification technology. It includes oil filling, where an oil pump transfers crude oil from a negative pressure crude oil tank to a separation cylinder. By switching a first solenoid valve, the left cylinder of the separation cylinder is filled with oil and the right cylinder is drained, or vice versa. Vacuum separation and air extraction: after the separation cylinder is filled with oil, the first solenoid valve is closed, cutting off the oil filling and discharge lines, and then the second solenoid valve is opened to connect the air extraction line. Gas content is measured: a small amount of separated hydraulic oil is injected into a piston-type oil and gas content meter and drained into a negative pressure isolation tank. The first solenoid valve is switched, the third solenoid valve is connected, and the oil pump is started. If the left cylinder of the separation cylinder is full of oil, crude oil is injected into the right cylinder of the separation cylinder, and the oil in the left cylinder of the separation cylinder is then drained into the negative pressure isolation tank through the isolation piston ring. Advantages: simple operation; ability to discharge extracted air and prevent air from flowing back into the oil.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic system oil purification, and particularly relates to an ultra-vacuum separation device for hydraulic oil-dissolved air and a separation method thereof. Background Art

[0002] Because oil is produced and stored in the atmosphere, it inevitably dissolves into air. Dissolved air exists in the oil in extremely tiny, invisible particles, typically 8% to 10% dissolved air. Dissolved air has several negative effects on oil: first, it reduces the bulk elastic modulus and rigidity of the oil, causing a corresponding deterioration in the hydraulic system; second, dissolved air causes cavitation, exacerbating the peeling and damage of surface materials on high-speed rotating parts such as pump impellers, causing vibration and noise; and third, in the closed hydraulic systems of underwater buoyancy equipment, the released dissolved air can cause uneven buoyancy, affecting the equipment's ability to dive. Currently, no equipment exists in the production process that can quickly and effectively separate dissolved air from oil, nor does an effective method exist for identifying dissolved air. Consequently, current production efficiency is low, and oil quality is unstable, further impacting equipment performance.

[0003] In view of the above-mentioned prior art, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Summary of the Invention

[0004] The primary task of the present invention is to provide a hydraulic oil dissolved air ultra-vacuum separation device, which has good oil and gas separation effect, can be operated in batches and can realize oil and gas content monitoring.

[0005] Another task of the present invention is to provide a separation method for a hydraulic oil-dissolved air ultra-vacuum separation device, which has simple operation steps and can ensure the full realization of the effect of the hydraulic oil-dissolved air ultra-vacuum separation device.

[0006] In order to complete the primary task, the technical solution provided by the present invention is a hydraulic oil dissolved air ultra-vacuum separation device, including a separation cylinder, an excitation plate assembly, a second pressure reducing valve, a second solenoid valve, an electric piston separator, a separator outward one-way valve, a separator negative pressure sensor, a measuring device negative pressure sensor, a piston type oil and gas content measuring device, a first ball valve, a second ball valve, a third solenoid valve, an oil pump, a negative pressure isolation oil tank, a negative pressure original oil tank, a first pressure reducing valve and a first solenoid valve. The separation cylinder is arranged on the excitation plate assembly, including a left cylinder and a right cylinder isolated from each other, and the left cylinder and the right cylinder respectively have an oil circuit interface at the bottom and an exhaust interface at the top. The first solenoid valve is a three-position four-way solenoid valve, and the first oil port of the first solenoid valve is connected to the first oil port of the third solenoid valve, and the second oil port of the third solenoid valve is separated There are two routes, one of which is connected to the piston-type oil and gas content meter through a manual first ball valve, and the other is connected to the negative pressure isolation oil tank through a manual second ball valve. The third oil port of the third solenoid valve is connected to the negative pressure isolation oil tank, the second oil port of the first solenoid valve is connected to the oil circuit interface of the left cylinder of the separation cylinder, the fourth oil port of the first solenoid valve is connected to the oil circuit interface of the right cylinder of the separation cylinder, the third oil port of the first solenoid valve is connected to the first pressure reducing valve, the first pressure reducing valve is connected to the oil pump, and the oil pump is connected to the negative pressure original oil tank, the exhaust interface of the left cylinder of the separation cylinder and the exhaust interface of the right cylinder are respectively connected to the first interface of the second pressure reducing valve through a pipeline provided with an outward one-way air valve, the second interface of the second pressure reducing valve is connected to the negative pressure isolation oil tank, the third interface of the second pressure reducing valve is connected to the first interface of the second solenoid valve, and the second interface of the second solenoid valve is connected to the electric piston-type separator.

[0007] In a specific embodiment of the present invention, the separation oil cylinder includes a left sealing end cover, an isolation piston ring, a tightening screw, a separation cylinder, a cylinder end cover sealing ring, a right sealing end cover, an oil circuit interface, a sensor fixing plate, an oil cylinder magnetic induction sensor, a guide ring, an oil cylinder magnetic ring, a piston sealing ring and a tightening stud. The left sealing end cover and the right sealing end cover are respectively arranged at the two ends of the separation cylinder. Cylinder end cover sealing rings are provided between the separation cylinder and the left sealing end cover and the right sealing end cover. The left sealing end cover and the right sealing end cover are fastened together by the cooperation of the tightening screw and the tightening stud. The left sealing end cover and the right sealing end cover are respectively arranged at the two ends of the separation cylinder. The sealing end cover is provided with an exhaust interface at the top and an oil circuit interface at the bottom. The isolation piston ring is arranged in the separation cylinder, and the isolation piston ring has three grooves distributed axially at intervals on the outer peripheral wall. The piston sealing ring, cylinder magnetic ring and guide ring are arranged in the three grooves from left to right in sequence. There are multiple cylinder magnetic induction sensors, and multiple cylinder magnetic induction sensors are fixed on the outer wall of the separation cylinder through a sensor fixing plate and are evenly distributed along the axial direction of the separation cylinder. The cylinder magnetic ring cooperates with the cylinder magnetic induction sensor to realize the status display and position control of the isolation piston ring.

[0008] In another specific embodiment of the present invention, the excitation plate assembly includes an excitation plate, a wire rope vibration isolator, a high-speed vibration motor, a vibration conduction frame, a motor fixing frame and a cylinder fixing frame. The separation cylinder and the electric piston separator are provided on the front of the excitation plate. The high-speed vibration motor is fixed to the middle of the back side of the excitation plate through the motor fixing frame. The vibration conduction frame is U-shaped, and the arc-shaped portion is provided on the high-speed vibration motor. The two ends are fixedly installed on the bottom of the excitation plate. The vibration conduction frame and the motor fixing frame cooperate to transmit high-frequency vibration to the excitation plate assembly. There is a pair of wire rope vibration isolators, which are provided at both ends of the length direction of the bottom of the excitation plate. There is a pair of cylinder fixing frames, one of which is fixedly installed on the left sealing end cover of the separation cylinder, and the other cylinder fixing frame is fixedly connected to the right sealing end cover of the separation cylinder. The bottom of the pair of cylinder fixing frames forms an installation folding edge, which is fixed to the excitation plate through the installation folding edge.

[0009] In another specific embodiment of the present invention, the electric piston separator includes a piston shaft sealing ring, a cylinder end cover sealing ring, a cylinder magnetic ring, a screw locking nut, a bearing locking nut, a screw, a screw motor, an upper sealing end cover, a cylinder, a plane thrust bearing, a bearing gasket, a wear-resistant ring, a cylinder piston YCC sealing ring, a lower end cover gasket, a lower sealing end cover, a separator piston and a cylinder magnetic sensor. The upper sealing end cover and the lower sealing end cover are respectively arranged at the top and bottom of the cylinder, and the lower sealing end cover is provided with a cylinder end cover sealing ring on the outer surface that cooperates with the cylinder. The lower sealing end cover is provided with a lower end cover gasket on the contact surface with the bottom of the cylinder. The screw motor is installed on the upper sealing end cover through the motor seat. The separator piston is located in the cylinder to separate the cylinder into an upper cylinder and a lower cylinder. The upper end of the screw is connected to the screw motor. The separator piston is formed with a bearing accommodating cavity at the upper end and a screw accommodating cavity is formed at the bottom of the bearing accommodating cavity. The plane thrust bearing is arranged in the bearing accommodating cavity. The bottom of the plane thrust bearing is provided with a bearing gasket. The bearing locking nut is threadedly connected to the outer wall of the bearing accommodating cavity to lock the plane thrust. The bearing is fixed, and the lower end of the screw rod extends into the screw rod accommodating cavity after passing through the bearing locking nut and the plane thrust bearing. The screw rod locking nut is threadedly connected to the lower end of the screw rod. The cylinder piston YCC sealing ring and the cylinder magnetic ring are spaced apart and arranged on the separator piston. There is a pair of cylinder piston YCC sealing rings. The cylinder magnetic ring is located between the pair of cylinder piston YCC sealing rings. When the cylinder magnetic ring is equipped with a magnetic sensor, it is used to control the displacement of the separator piston. The wear-resistant ring is arranged outside the cylinder magnetic ring. The lower sealing end cover is formed with a pipeline and a connection in the middle along the longitudinal direction. The second solenoid valve is connected to the air intake channel, and two air pipes extend to the left and right sides respectively, one of which is used for exhaust and is provided with a separator outward one-way valve, and the other air pipe serves as a pressure measuring port, which is connected to the separator negative pressure sensor through an inward one-way valve, and is used to measure the pressure in the cylinder. The separator piston forms a piston shaft at the bottom, and the piston shaft is adapted to the upper port of the air intake channel of the lower sealing end cover. The piston shaft is provided with the piston shaft sealing ring, and multiple cylinder magnetic sensors are arranged at intervals along the height direction of the outer edge of the cylinder.

[0010] In another specific embodiment of the present invention, the piston-type oil and gas content meter includes an end cover transition plate, an oil-containing sleeve, a bottom sealing end cover, a meter cylinder, a meter magnetic ring, a meter piston YCC sealing ring, a top cover sealing ring, a top sealing end cover, a sealing buffer pad, a meter piston, a piston pull rod, a wire sensor fixing bracket, a wire sensor, a connecting rod and a Y-type joint. The top sealing end cover and the bottom sealing end cover are respectively arranged at the top and bottom of the meter cylinder, and the top sealing end cover extends a meter oil pipe to the left and right sides respectively, one of which is connected to the third solenoid valve and the first ball valve through a pipeline, and the other meter oil pipe is connected to a meter negative pressure sensor, the top cover sealing ring is arranged on the contact surface between the top sealing end cover and the top of the meter cylinder, the bottom sealing end cover is supported on the end cover transition plate and passes through the end cover transition plate, and the meter piston is arranged In the measuring cylinder, there is a pair of YCC sealing rings of the measuring piston, which are arranged on the measuring piston at intervals from top to bottom. The measuring magnetic ring is arranged on the measuring piston and is located between a pair of top cover sealing rings. The piston pull rod is located below the measuring piston and the top end is fixedly connected to the measuring piston by a screw. The top sealing end cover is provided with the sealing buffer pad on the inner wall facing the screw. The bottom end of the piston pull rod extends downward through the oil-containing shaft sleeve in the bottom sealing end cover and is connected to the Y-type joint. A gravity block is connected to the Y-type joint. The pull wire sensor fixing frame is fixedly connected to the end cover transition plate. The pull wire sensor is fixed on the pull wire sensor fixing frame. The bottom end of the piston pull rod is also connected to one end of the connecting rod, and the other end of the connecting rod is connected to the pull wire head of the pull wire sensor. The pull wire sensor is used to collect the displacement data of the measuring piston.

[0011] In another specific embodiment of the present invention, it also includes a device fixing plate, and the separation cylinder, excitation plate assembly, second pressure reducing valve, second solenoid valve, electric piston separator, separator outward one-way valve, separator negative pressure sensor, measuring device negative pressure sensor, piston-type oil and gas content measuring device, first ball valve, second ball valve, third solenoid valve, oil pump, first pressure reducing valve and first solenoid valve are arranged on the device fixing plate, and the wire rope vibration isolator is used to reduce the vibration transmitted to the device fixing plate.

[0012] To accomplish another task, the present invention provides a technical solution, which is a separation method of a hydraulic oil-dissolved air ultra-vacuum separation device, comprising the following steps:

[0013] S1) Oil filling: The oil pump delivers crude oil from the negative pressure crude oil tank to the separation cylinder. By switching the first solenoid valve, the separation cylinder is filled with oil from the left cylinder and drained from the right cylinder, or filled with oil from the right cylinder and drained from the left cylinder;

[0014] S2) Vacuum separation and air extraction: After the oil fills the separation cylinder, close the first solenoid valve, cut off the oil charging and discharging pipelines, then open the second solenoid valve, connect the air extraction pipeline, and the screw motor drives the separator piston upward. When the separation pressure is reached, the dissolved air in the oil is extracted. Then close the second solenoid valve, and the screw motor drives the separator piston in the opposite direction to discharge the extracted air from the cylinder. The separator piston moves up and down N times until the standard requirement is met;

[0015] S3) Measuring the gas content: Inject a small amount of separated hydraulic oil into a piston-type oil-gas content measuring instrument, record the displacement of the wire displacement sensor at this moment, then release the gravity block until the value of the measuring instrument's negative pressure sensor reaches the set pressure value for the first time, read the displacement of the wire displacement sensor, and obtain the oil gas content;

[0016] S4) Drain the oil into the negative pressure isolation tank, switch the first solenoid valve, connect the third solenoid valve, start the oil pump, and if the left cylinder of the separation cylinder is full of oil, inject crude oil into the right cylinder of the separation cylinder and then drain the oil in the left cylinder of the separation cylinder into the negative pressure isolation tank through the isolation piston ring.

[0017] Due to the adoption of the above-mentioned structure, the present invention has the following beneficial effects compared with the prior art: first, batch operation can be realized by switching the separation cylinder left and right; second, the coordinated operation of the electric piston separator, the solenoid valve and the one-way valve can realize the exhaust of the extracted air and prevent the air from flowing back into the oil; third, by installing the separation cylinder on the excitation plate assembly, on the one hand, the agitation of the oil is accelerated, thereby increasing the release of air from the oil; on the other hand, by accelerating the friction of oil molecules, the air is prevented from quickly dissolving back into the oil after the oil contacts the air; fourth, the online monitoring function of the oil and gas content is added, integrating operation and detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the present invention;

[0020] Figure 3 This is a principle block diagram of the state of the left cylinder filling with oil and the right cylinder draining oil;

[0021] Figure 4 This is a block diagram of the state and detection principle of the right cylinder filling with oil and the left cylinder draining oil according to the present invention;

[0022] Figure 5 This is a structural diagram of the separation oil cylinder of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the excitation plate assembly of the present invention;

[0024] Figure 7 is a cross-sectional view of the electric piston separator according to the present invention;

[0025] Figure 8 This is a cross-sectional view of the piston-type oil and gas content measuring device described in the present invention.

[0026] Figure: 1. Separation cylinder, 101. Left sealing end cap, 102. Isolation piston ring, 1021. Groove, 103. Tensioning screw, 104. Separation cylinder, 105. Cylinder end cap seal, 106. Right sealing end cap, 107. Oil line interface, 108. Sensor fixing plate, 109. Cylinder magnetic induction sensor, 110. Guide ring, 111. Cylinder magnetic ring, 112. Piston sealing ring, 113. Tensioning stud, 114 Exhaust interface; 2. Excitation plate assembly, 201. Excitation plate, 202. Wire rope vibration isolator, 203. High-speed vibration motor , 204. Vibration transmission frame, 205. Motor mounting bracket, 206. Cylinder mounting bracket, 2061. Mounting flange; 3. Second pressure reducing valve; 4. Second solenoid valve; 5. Electric piston separator, 501. Piston shaft seal ring, 502. Cylinder end cover seal ring, 503. Cylinder magnetic ring, 504. Screw locking nut, 505. Bearing locking nut, 506. Screw, 507. Screw motor, 508. Upper sealing end cover, 509. Cylinder, 510. Planar thrust bearing, 511. Bearing gasket, 512. Wear ring, 513. Cylinder piston Y CC sealing ring, 514. Lower end cover gasket, 515. Lower sealing end cover, 5151. Cylinder air intake passage, 5152. Air pipe, 516. Separator piston, 5161. Bearing accommodating chamber, 5162. Screw accommodating chamber, 5163. Piston shaft, 517. Cylinder magnetic sensor; 6. Outward check valve; 7. Separator negative pressure sensor; 8. Measuring device negative pressure sensor; 9. Piston oil and gas content measuring device, 901. End cover transition plate, 902. Oil-containing shaft sleeve, 903. Bottom sealing end cover, 904. Measuring device cylinder, 905. Measuring device magnetic ring, 906. 06. Measuring device piston YCC sealing ring, 907. Top cover sealing ring, 908. Top sealing end cover, 9081. Measuring device oil pipe, 909. Sealing buffer pad, 910. Measuring device piston, 911. Piston pull rod, 912. Pull wire sensor fixing bracket, 913. Pull wire sensor, 914. Connecting rod, 915. Y-type connector; 10. First ball valve; 11. Second ball valve; 12. Third solenoid valve; 13. Oil pump; 14. Negative pressure isolation oil tank; 15. Negative pressure original oil tank; 16. First pressure reducing valve; 17. First solenoid valve; 18. Device fixing plate. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solutions. Any changes in form rather than substance based on the concept of the present invention should be regarded as within the scope of protection of the present invention.

[0028] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are with respect to the position state of the figure being described. The purpose is to facilitate public understanding, and therefore it cannot be understood as a special limitation on the technical solution provided by the present invention.

[0029] The present invention relates to a hydraulic oil dissolved air ultra-vacuum separation device. This device utilizes piston motion to create an ultra-vacuum suction force, achieving a hydraulic oil dissolved air separation pressure of 100 to 6700 Pa (Pa), thereby separating the dissolved air from the hydraulic oil. Various valve components are then used to isolate the dissolved air from the hydraulic oil. The present invention is primarily used to process hydraulic oil to separate dissolved air, preventing the release of dissolved air during subsequent use and causing hydraulic system instability. The present invention shares common functional objectives with conventional hydraulic oil processing devices, both of which are designed to purify hydraulic oil.

[0030] See Figure 1 and Figure 2 The present invention includes a hydraulic oil dissolved air ultra-vacuum separation device, including a device fixing plate 18 and a separation cylinder 1, an excitation plate assembly 2, a second pressure reducing valve 3, a second solenoid valve 4, an electric piston separator 5, a separator outward one-way valve 6, a separator negative pressure sensor 7, a measuring device negative pressure sensor 8, a piston-type oil and gas content measuring device 9, a first ball valve 10, a second ball valve 11, a third solenoid valve 12, an oil pump 13, a first pressure reducing valve 16 and a first solenoid valve 17, and also includes a negative pressure isolation oil tank 14 and a negative pressure original oil tank 15.

[0031] The separation cylinder 1 is arranged on the excitation plate assembly 2, and includes a left cylinder and a right cylinder isolated from each other. The left cylinder and the right cylinder respectively have an oil circuit interface 107 at the bottom and an exhaust interface 114 at the top. The first solenoid valve 17 is a three-position four-way solenoid valve, the second solenoid valve 4 is a two-position two-way solenoid valve, the third solenoid valve 12 is a two-position three-way solenoid valve, and the first pressure reducing valve 16 and the second pressure reducing valve 3 are one-in-one-out valves. The first oil port of the first solenoid valve 17 is connected to the first oil port of the third solenoid valve 11, and the second oil port of the third solenoid valve 11 is divided into two paths, one of which is connected to the piston-type oil and gas content meter 9 through the first ball valve 10, and the other is connected to the negative pressure isolation tank 14 through the second ball valve 11. The third oil port of the third solenoid valve 12 is connected to the negative pressure isolation tank 14, the second oil port of the first solenoid valve 17 is connected to the oil circuit interface 107 of the left cylinder of the separation cylinder 1, the fourth oil port of the first solenoid valve 17 is connected to the oil circuit interface 107 of the right cylinder of the separation cylinder 1, and the first oil port of the first solenoid valve 17 is connected to the oil circuit interface 107 of the right cylinder of the separation cylinder 1. The third oil port is connected to the first pressure reducing valve 16, which is connected to the oil pump 13, which is connected to the negative pressure crude oil tank 15. The exhaust port 114 of the left and right cylinders of the separation cylinder 1 is connected to a three-way pipe and then connected to the first port of the second pressure reducing valve 3 through an outward one-way air valve. The second port of the second pressure reducing valve 3 is connected to the negative pressure isolation oil tank 14. The third port of the second pressure reducing valve 3 is connected to the first port of the second solenoid valve 4, and the second port of the second solenoid valve 4 is connected to the electric piston separator 5. The second solenoid valve 4 opens when pumping air and closes when exhausting air.

[0032] In this embodiment, a first pressure reducing valve 15 is installed at the rear end of the oil pump 13, and the pressure is set to 1.5Mpa, which is used to control the pressure of the input oil to prevent damage to the separation cylinder 1. A second pressure reducing valve 3 is set between the separation cylinder 1 and the electric piston separator 5, and the pressure is set to 1Mpa, which is used to expel the trapped air in the separation cylinder 1 when the separation cylinder 1 is filled with oil. The hydraulic oil in the negative pressure original oil tank 15 can be pumped into the separation cylinder 1 through the oil pump 13. The first solenoid valve 17 is equivalent to a reversing valve, which is controlled by the control system and is used to change the direction of the oil circuit and inject it into the left cylinder or right cylinder of the separation cylinder 1. The separation cylinder 1 can be as follows Figure 3 The left cylinder is filled with oil and the right cylinder is discharged with oil. Figure 4As shown, oil enters the right cylinder and exits the left cylinder. Taking the left cylinder of the separation cylinder 1 as an example, the specific oil path is as follows: the hydraulic oil in the negative pressure original tank 15 enters the first pressure reducing valve 16 via the oil pump 13, and then from the first pressure reducing valve 16 to the first solenoid valve 17. The second oil port of the first solenoid valve 17 sends the hydraulic oil to the left cylinder of the separation cylinder 1, and the oil output of the right cylinder of the separation cylinder 1 is sent to the fourth oil port of the first solenoid valve 17. The first solenoid valve 17 sends the separated hydraulic oil to the third solenoid valve 12 through the first oil port. Then, the following three paths will appear: First, the hydraulic oil enters the negative pressure isolation tank 14 from the third solenoid valve 12; second, the hydraulic oil enters the negative pressure isolation tank 14 from the third solenoid valve 12 via the second ball valve 11; third, the hydraulic oil enters the piston-type oil and gas content meter 9 from the third solenoid valve 12 via the first ball valve 10.

[0033] See Figure 5The separation cylinder 1 includes a left sealing end cover 101, an isolation piston ring 102, a tightening screw 103, a separation cylinder 104, a cylinder end cover sealing ring 105, a right sealing end cover 106, an oil circuit interface 107, a sensor fixing plate 108, a cylinder magnetic induction sensor 109, a guide ring 110, a cylinder magnetic ring 111, a piston sealing ring 112, and a tightening stud 113. The left sealing end cover 101 and the right sealing end cover 106 are respectively arranged at the two ends of the separation cylinder 104. Cylinder end cover sealing rings 105 are respectively provided between the separation cylinder 104 and the left sealing end cover 101 and the right sealing end cover 106. The left sealing end cover 101 and the right sealing end cover 106 are fastened together by the cooperation of the tightening screw 103 and the tightening stud 113. The oil cylinder end cover sealing ring 105 at the left sealing end cover 101 and the right sealing end cover 106 uses two O-rings of different specifications, thereby achieving axial and radial double sealing. The left sealing end cover 101 and the right sealing end cover 106 are respectively provided with an exhaust interface 114 at the top, and a one-way valve is installed at the exhaust interface 114 to prevent the oil and gas in the left and right cylinders from mixing with each other, and the backflow gas returns to the hydraulic oil when the piston of the electric piston separator 5 is pressed down. The left sealing end cover 101 and the right sealing end cover 106 are respectively provided with an oil circuit interface 107 at the bottom. In order not to affect the vibration effect of the excitation plate assembly 2, the oil and air pipes of the separation cylinder 1 are both made of high-pressure hoses, and the other high-pressure parts are connected with stainless steel oil pipes. The isolation piston ring 102 is disposed within the separation cylinder 104. Three grooves 1021 are spaced axially along the outer circumferential wall of the isolation piston ring 102. The piston sealing ring 112, cylinder magnetic ring 111, and guide ring 110 are sequentially disposed within these grooves 1021 from left to right. Multiple cylinder magnetic sensors 109 are secured to the outer wall of the separation cylinder 104 via a sensor mounting plate 108 and evenly distributed along the axial direction of the separation cylinder 104. The cylinder magnetic ring 111 cooperates with the cylinder magnetic sensors 109 to locate the position of the isolation piston ring 102, enabling status display and position control of the isolation piston ring 102. In this embodiment, five cylinder magnetic sensors 109 are shown. The separation cylinder 104 is a circular cylinder made of transparent acrylic, allowing for easy observation of the position of the isolation piston ring 102 and the status of the oil in the left and right cylinders. When hydraulic oil is injected into the left cylinder, it pushes isolation piston ring 102 to the right, expelling the right cylinder hydraulic oil from separation cylinder 104. When hydraulic oil is injected into the right cylinder, it pushes isolation piston ring 102 to the left, expelling the left cylinder hydraulic oil from separation cylinder 104. A peristaltic sensor is installed on the pressure relief hose of the second pressure reducing valve 3. When the magnetic sensor signal and the peristaltic sensor signal are detected when the piston of separation cylinder 1 moves to one end, the pump is automatically stopped.

[0034] See Figure 6The excitation plate assembly 2 includes an excitation plate 201, a wire rope isolator 202, a high-speed vibration motor 203, a vibration conduction frame 204, a motor fixing frame 205 and a cylinder fixing frame 206. The separation cylinder 1 and the electric piston separator 5 are provided on the front of the excitation plate 201. The high-speed vibration motor 203 is fixed in the middle of the back of the excitation plate 201 through the motor fixing frame 205. The vibration conduction frame 204 is U-shaped, and the arc-shaped portion is provided on the high-speed vibration motor 203, and the two ends are fixedly mounted on the bottom of the excitation plate 201. The vibration conduction frame 204 and the motor fixing frame 205 cooperate to transmit high-frequency vibration to the excitation plate assembly 2. There is a pair of wire rope isolators 202, which are provided at both ends of the length direction of the bottom of the excitation plate 201 to reduce the vibration transmitted to the device fixing plate 18. The pair of cylinder mounting brackets 206 are provided, one of which is fixedly mounted to the left sealing end cap 101 of the separation cylinder 1, while the other is fixedly connected to the right sealing end cap 106 of the separation cylinder 1. The bottoms of the pair of cylinder mounting brackets 206 form mounting flanges 2061, which are secured to the excitation plate 201 via the mounting flanges 2061. While the electric piston separator 5 is operating, the high-speed vibration motor 203 is activated to vibrate the separation cylinder 104, accelerating the extraction of dissolved air and releasing tension between oil molecules.

[0035] See Figure 7The electric piston separator 5 includes a piston shaft seal 501, a cylinder end cover seal 502, a cylinder magnetic ring 503, a screw lock nut 504, a bearing lock nut 505, a screw 506, a screw motor 507, an upper seal end cover 508, a cylinder 509, a planar thrust bearing 510, a bearing gasket 511, a wear-resistant ring 512, a cylinder piston YCC seal 513, a lower end cover gasket 514, a lower seal end cover 515, a separator piston 516, and a cylinder magnetic sensor 517. The cylinder 509 is a circular cylinder. The upper seal end cover 508 and the lower seal end cover 515 are respectively arranged at the top and bottom of the cylinder 509. The lower seal end cover 515 is a transparent acrylic end cover for observing the oil and gas status in the cylinder 509. The lower sealing end cap 515 is provided with a cylinder end cap sealing ring 502 on its outer surface that mates with the cylinder 509. A lower end cap gasket 514 is provided on the contact surface with the bottom of the cylinder 509. The screw motor 507 is mounted on the upper sealing end cap 508 via a motor base. The separator piston 516 is located within the cylinder 509, separating the cylinder 509 into an upper cylinder and a lower cylinder. The upper end of the screw 506 is connected to the screw motor 507. The separator piston 516 has a bearing accommodating cavity 5161 formed at its upper end, and a screw accommodating cavity 5162 formed at its bottom. The planar thrust bearing 510 is disposed within the bearing accommodating cavity 5161. A bearing gasket 511 is provided at its bottom. The bearing lock nut 505 is threadedly engaged with the outer wall of the bearing accommodating cavity 5161 to secure the planar thrust bearing 510. The lower end of the screw 506 passes through the bearing lock nut 505 and the planar thrust bearing 510 and extends into the screw accommodating cavity 5162. The screw lock nut 504 is threadedly connected to the lower end of the screw 506. The cylinder piston YCC seal ring 513 and the cylinder magnetic ring 503 are spaced apart and mounted on the separator piston 516. There is a pair of cylinder piston YCC seal rings 513, with the cylinder magnetic ring 503 located between the pair of cylinder piston YCC seal rings 513. The wear-resistant ring 512 is mounted outside the cylinder magnetic ring 503. The cylinder magnetic ring 503 can be used with a magnetic sensor 517 to control the displacement of the separator piston 516. The rotational motion of the screw 506 is converted into linear reciprocating motion of the cylinder piston YCC seal ring 513. The lower sealing end cap 515 has an air inlet passage 5151 formed longitudinally in the middle, with two air pipes 5152 extending to the left and right. One air pipe 5152 is used for exhaust and is provided with a separator outward check valve 6. The other air pipe 5152 serves as a pressure measurement port, which is connected to the separator negative pressure sensor 7 through an inward check valve to measure the pressure within the cylinder 509. The air inlet passage 5151 is connected to the exhaust port 114 of the separator cylinder 1 via the second solenoid valve 4 and the second pressure reducing valve 4.The separator piston 516 has a piston shaft 5163 formed at its bottom. This shaft 5163 mates with the upper port of the intake passage 5151 of the lower sealing end cap 515. The piston shaft seal 501 is mounted on this shaft. The piston shaft seal 501 cooperates with the cylinder end cap seal 502 to seal the lower portion of the cylinder 509, while also providing a cushioning effect. Multiple cylinder magnetic sensors 517 are spaced along the outer edge of the cylinder 509, two of which are employed here.

[0036] The screw motor 507 drives the separator piston 516 upward within the cylinder 509, thereby extracting the dissolved air within the separator oil cylinder 1. When the separator piston 516 reaches the upper limit or the separator negative pressure sensor 7 measures the set pressure value (-0.095 Pa in this embodiment), the screw motor 507 stops rotating. After waiting for 30 seconds, the second solenoid valve 4 is closed. The screw motor 507 then rotates in the opposite direction, driving the separator piston 516 downward, exhausting the air through the outward check valve 6 at the exhaust port of the electric piston separator 5. This process is repeated N times until the oil gas content test passes.

[0037] See Figure 8The piston-type oil and gas content meter 9 includes an end cover transition plate 901, an oil-containing sleeve 902, a bottom sealing end cover 903, a meter cylinder 904, a meter magnetic ring 905, a meter piston YCC seal 906, a top cover seal 907, a top sealing end cover 908, a sealing cushion 909, a meter piston 910, a piston rod 911, a cable sensor mounting bracket 912, a cable sensor 913, a connecting rod 914, and a Y-connector 915. The meter cylinder 904 is a circular hydraulic cylinder, with the top sealing end cover 908 and bottom sealing end cover 903 respectively located at the top and bottom of the meter cylinder 904. The top sealing end cover 908 is a transparent acrylic end cover used to observe the oil and gas status in the meter cylinder 904. The top sealing end cap 908 extends to the left and right sides respectively, with measuring device oil pipes 9081 extending therefrom. One measuring device oil pipe 9081 is connected to the first ball valve 10 and the third solenoid valve 12 via a pipeline, and the other measuring device oil pipe 9081 is connected to the measuring device negative pressure sensor 8. The top cover sealing ring 907 is provided on the contact surface between the top sealing end cap 908 and the top of the measuring device cylinder 904. The bottom sealing end cap 903 is supported on the end cap transition plate 901 and passes through the end cap transition plate 901. The measuring device piston 910 is provided in the measuring device cylinder 904. The measuring device piston YCC sealing ring 906 has a pair of sleeves on the measuring device piston 910 with an interval between the upper and lower sleeves. The measuring device magnetic ring 905 is sleeved on the measuring device piston 910 and is located between the pair of measuring device piston YCC sealing rings. Between the sealing rings 906, the piston rod 911 is located below the measuring piston 910 and its top end is fixedly connected to the measuring piston 910 via a screw. The top sealing end cap 908 has a sealing cushion 909 on its inner wall facing the screw. The bottom end of the piston rod 911 extends downward through the oil-containing sleeve 902 in the bottom sealing end cap 903 and connects to the Y-shaped joint 915. A standard gravity block is connected to the Y-shaped joint 915, and the gravity of the gravity block itself pulls the piston rod 911 downward. The wire sensor bracket 912 is fixedly connected to the end cap transition plate 901. The wire sensor 913 is fixed to the wire sensor bracket 912. The bottom end of the piston rod 911 is also connected to one end of a connecting rod 914, the other end of which is connected to the wire head of the wire sensor 913. The wire sensor 913 is used to collect displacement data of the measuring piston 910 for subsequent calculation of oil and gas content.

[0038] The separated oil is injected into the measuring cylinder 904 through the logic control of the solenoid valve. The system clicks to start measurement, slowly releases the gravity block, and gradually increases the weight until the negative pressure sensor 8 of the measuring device reaches -0.095 Pa. The system reads the displacement of the wire sensor 913, and the oil gas content α can be obtained through the volume change conversion formula:

[0039] Among them, V1 is the changed volume, V2 is the volume after pumping and pressing, S is the area of ​​the measuring cylinder, L1 is the initial position of the pull-wire sensor 913, and L2 is the position of the pull-wire sensor 913 after pumping and pressing.

[0040] Furthermore, the negative pressure isolation oil tank 14 comprises an oil tank, an isolation piston, an ultrasonic vibrator, an air pump, and a negative pressure gauge. The oil pump 13 is used to pump the air in the negative pressure isolation oil tank 14 to below -0.6Mpa, and the isolation piston is used to isolate the air in the tank from contacting the oil again. The ultrasonic vibrator can vibrate the oil and release the tension between the oil molecules again. Fifth, by using the negative pressure isolation oil tank 14, the separated oil is injected into the negative pressure isolation oil tank 14, which can isolate the oil from long-term contact with the air. The air pump and the isolation piston can prevent the air from dissolving into the oil again. At the same time, the effect of the ultrasonic vibrator is also conducive to releasing the tension of the oil molecules, preventing the air from quickly dissolving back into the hydraulic oil during subsequent use.

[0041] The separation method of the hydraulic oil-dissolved air ultra-vacuum separation device includes the following steps.

[0042] Step S1) is oiling, specifically:

[0043] S11) Oil filling preparation, select left cylinder oil filling, the system automatically opens the left channel of the first solenoid valve 17, closes the second solenoid valve 4, and opens the third solenoid valve 12;

[0044] S12) Start oil filling and turn on the oil pump 13. The oil pump 13 injects the unseparated hydraulic crude oil in the negative pressure crude oil tank 15 into the left cylinder of the separation cylinder 1. At the same time, the separated oil in the right cylinder of the separation cylinder 1 is discharged into the negative pressure isolation tank 14 through the action of the piston in the cylinder. When the cylinder piston moves to the specified position, the pump is automatically stopped.

[0045] S13) Fluid replenishment: Select the left cylinder fluid replenishment. The system automatically opens the left channel of the first solenoid valve 17, closes the second solenoid valve 4 and the third solenoid valve 12, and can forcibly start the oil pump 13 to pump hydraulic oil into the left cylinder of the separation cylinder 1 to expel the air in the left cylinder;

[0046] Step S2) is vacuum separation and exhaust, specifically:

[0047] S21) In preparation for air extraction, the system automatically closes the first solenoid valve 17 and the third solenoid valve 12, and opens the second solenoid valve 4;

[0048] S22) Separate and exhaust gas, start the screw motor 507 of the electric piston separator 5, drive the separator piston 516 to move up and down N times, using an oil-gas separation pressure of 100-6700 Pa. When the separator negative pressure sensor 7 reaches -0.095 MPa or the screw motor 507 moves to the upper limit, the separator piston 516 stops moving upward, closes the second solenoid valve 4, and after a pause of n seconds, the separator piston 516 begins to move slowly downward. Due to the action of the outward one-way valve 6, the extracted air is discharged outward through the lateral discharge one-way valve of the electric piston separator 5;

[0049] S23) Accelerating disturbance, while separating and pumping air, automatically turning on the high-frequency excitation plate assembly 2 to fully disturb the hydraulic oil to release dissolved air;

[0050] Step S3) is to measure the gas content.

[0051] S31) Measurement preparation, all valves are automatically closed;

[0052] S32) Oil filling: Open the right channel of the first solenoid valve 17. After 2 seconds, start the oil pump 13 to pump crude oil into the right cylinder of the separation cylinder 1. At the same time, squeeze out the separated oil in the left cylinder to the scale line position of the piston-type oil and gas content measuring instrument 9, and automatically close all solenoid valves;

[0053] S33) measurement, close the first ball valve 11 at the left end of the piston-type oil and gas content meter 9, release the gravity block until the pressure detected by the negative pressure sensor 8 of the meter is less than -0.095pa, and measure the displacement of the meter piston 910 by the wire sensor 913, automatically calculate the dissolved air content in the hydraulic oil, and judge whether it is qualified.

[0054] Step S4) is to drain the oil to the negative pressure isolation oil tank 14, specifically:

[0055] S41)) In preparation for oil drain, the system automatically opens the right channel of the first solenoid valve 17 and the third solenoid valve 12, and closes the second solenoid valve 4;

[0056] S42) Start oil injection and start the oil pump 13 to inject the hydraulic crude oil that has not been separated from the oil and gas into the right cylinder of the separation cylinder 1. At the same time, the separated oil in the left cylinder of the separation cylinder 1 after the oil and gas are separated is discharged into the negative pressure isolation oil tank 14 through the action of the isolation piston ring 102 in the cylinder. When the isolation piston ring 102 of the separation cylinder 1 moves to the specified position, the pump is automatically stopped.

[0057] The above completes the oil-gas separation process for the left cylinder of separation cylinder 1. The same process is repeated for the right cylinder. Once the oil-gas separation is stabilized, parameters can be set and the system automatically operates until the negative pressure isolation tank 14 is full, whereupon the oil is stored. The automatic control of the present invention is achieved through the control system and its accompanying control panel.

Claims

1. A hydraulic oil dissolved air ultra-vacuum separation device, characterized by: The invention comprises a separation oil cylinder (1), an excitation plate assembly (2), a second pressure reducing valve (3), a second solenoid valve (4), an electric piston separator (5), a separator outward check valve (6), a separator negative pressure sensor (7), a measuring device negative pressure sensor (8), a piston type oil and gas content measuring device (9), a first ball valve (10), a second ball valve (11), a third solenoid valve (12), an oil pump (13), a negative pressure isolation oil tank (14), a negative pressure crude oil tank (15), a first pressure reducing valve (16) and a first solenoid valve (17). ), the separation oil cylinder (1) is arranged on the excitation plate assembly (2), including a left cylinder and a right cylinder isolated from each other, the left cylinder and the right cylinder respectively have an oil circuit interface (107) at the bottom and an exhaust interface (114) at the top, the first solenoid valve (17) is a three-position four-way solenoid valve, the first oil port of the first solenoid valve (17) is connected to the first oil port of the third solenoid valve (12), and the second oil port of the third solenoid valve (12) is divided into two paths, one of which is connected to the piston oil and gas through the manual first ball valve (10) The content meter (9) is connected to the negative pressure isolation oil tank (14) through the second manual ball valve (11). The third oil port of the third solenoid valve (12) is connected to the negative pressure isolation oil tank (14). The second oil port of the first solenoid valve (17) is connected to the oil circuit interface (107) of the left cylinder of the separation oil cylinder (1). The fourth oil port of the first solenoid valve (17) is connected to the oil circuit interface (107) of the right cylinder of the separation oil cylinder (1). The third oil port of the first solenoid valve (17) is connected to the first pressure reducing valve (16). The first pressure reducing valve (16) is connected to the oil pump. (13), the oil pump (13) is connected to the negative pressure crude oil tank (15), the exhaust interface (114) of the left cylinder and the exhaust interface (114) of the right cylinder of the separation oil cylinder (1) are respectively connected to the first interface of the second pressure reducing valve (3) through a pipeline provided with an outward one-way air valve, the second interface of the second pressure reducing valve (3) is connected to the negative pressure isolation oil tank (14), the third interface of the second pressure reducing valve (3) is connected to the first interface of the second solenoid valve (4), and the second interface of the second solenoid valve (4) is connected to the electric piston separator (5).

2. The hydraulic oil dissolved air ultra-vacuum separation device according to claim 1, characterized in that: The separation oil cylinder (1) comprises a left sealing end cover (101), an isolating piston ring (102), a tightening screw (103), a separation cylinder (104), an oil cylinder end cover sealing ring (105), a right sealing end cover (106), an oil circuit interface (107), a sensor fixing plate (108), an oil cylinder magnetic induction sensor (109), a guide ring (110), an oil cylinder magnetic ring (111), a piston sealing ring (112) and a tightening stud (11 3), the left sealing end cover (101) and the right sealing end cover (106) are respectively arranged at the two ends of the separation cylinder (104), and a cylinder end cover sealing ring (105) is provided between the separation cylinder (104) and the left sealing end cover (101) and the right sealing end cover (106). The left sealing end cover (101) and the right sealing end cover (106) are fastened by the cooperation of the tightening screw (103) and the tightening stud (113). The cover (101) and the right sealing end cover (106) are respectively provided with an exhaust interface (114) at the top and an oil circuit interface (107) at the bottom. The isolation piston ring (102) is arranged in the separation cylinder (104). The isolation piston ring (102) has three grooves (1021) distributed axially on the outer peripheral wall. The piston sealing ring (112), the oil cylinder magnetic ring (111) and the guide ring (110) are sequentially arranged in the three grooves (1021) from left to right. There are multiple oil cylinder magnetic induction sensors (109). The multiple oil cylinder magnetic induction sensors (109) are fixed on the outer wall of the separation cylinder (104) through a sensor fixing plate (108) and are evenly distributed along the axial direction of the separation cylinder (104). The oil cylinder magnetic ring (111) cooperates with the oil cylinder magnetic induction sensor (109) to realize the status display and position control of the isolation piston ring (102).

3. The hydraulic oil-dissolved air ultra-vacuum separation device according to claim 1, characterized in that: The excitation plate assembly (2) includes an excitation plate (201), a wire rope vibration isolator (202), a high-speed vibration motor (203), a vibration transmission frame (204), a motor fixing frame (205) and an oil cylinder fixing frame (206). The front of the excitation plate (201) is provided with the separation oil cylinder (1) and the electric piston separator (5). The high-speed vibration motor (203) is fixed to the middle of the back of the excitation plate (201) through the motor fixing frame (205). The vibration transmission frame (204) is U-shaped, and the arc portion is provided on the high-speed vibration motor (203). The two ends are fixedly installed with the bottom of the excitation plate (201). The guide frame (204) and the motor fixing frame (205) cooperate to transmit high-frequency vibration to the excitation plate assembly (2). The wire rope vibration isolators (202) are provided in a pair and are respectively arranged at both ends of the length direction of the bottom of the excitation plate (201). The oil cylinder fixing frames (206) are provided in a pair, one of which is fixedly mounted on the left sealing end cover (101) of the separation oil cylinder (1), and the other oil cylinder fixing frame (206) is fixedly connected to the right sealing end cover (106) of the separation oil cylinder (1). The bottoms of the pair of oil cylinder fixing frames (206) are formed with mounting folds (2061), and the mounting folds (2061) are used to fix the pair of oil cylinder fixing frames (206) to the excitation plate (201).

4. The ultra-vacuum separation device for dissolving air in hydraulic oil according to claim 1, characterized in that: The electric piston separator (5) comprises a piston shaft sealing ring (501), a cylinder end cover sealing ring (502), a cylinder magnetic ring (503), a screw locking nut (504), a bearing locking nut (505), a screw (506), a screw motor (507), an upper sealing end cover (508), a cylinder (509), a plane thrust bearing (510), a bearing gasket (511), a wear-resistant ring (512), a cylinder piston YCC sealing ring (513), a lower end cover gasket (514), a lower sealing end cover (515), a separator piston (516) and a cylinder magnetic sensor (517). The upper sealing end cover (508) and the lower sealing end cover (515) are respectively arranged at the top and bottom of the cylinder (509). The lower sealing end cover (515) is provided with a cylinder end cover sealing ring (502) on the outer surface that cooperates with the cylinder (509), and the lower sealing end cover (515) is provided with a lower end cover gasket (514) on the contact surface with the bottom of the cylinder (509). The screw motor (507) is installed on the upper sealing end cover (508) through the motor seat. The separator piston (516) is located in the cylinder (509) to separate the cylinder (509) into an upper cylinder and a lower cylinder. The upper end of the screw (506) is connected to the screw motor (507). The separator piston (516) is formed with a bearing accommodating chamber (5161) at the upper end, and a screw accommodating chamber (5162) is formed at the bottom of the bearing accommodating chamber (5161). The plane push The thrust bearing (510) is arranged in the bearing accommodating chamber (5161), the bottom of the plane thrust bearing (510) is padded with a bearing gasket (511), the bearing locking nut (505) is threadedly connected to the outer wall of the bearing accommodating chamber (5161) to fix the plane thrust bearing (510), the lower end of the screw rod (506) passes through the bearing locking nut (505) and the plane thrust bearing (510) and extends into the screw rod accommodating chamber (5162), the screw rod locking nut (504) is threadedly connected to the lower end of the screw rod (506), the cylinder piston YCC sealing ring (513) and the cylinder magnetic ring (503) are spaced and sleeved on the separator piston (516), and the cylinder piston YCC sealing ring (513) has A pair of cylinder magnetic rings (503) are located between a pair of cylinder piston YCC sealing rings (513). When the cylinder magnetic ring (503) is equipped with a magnetic sensor, it is used to control the displacement of the separator piston (516). The wear-resistant ring (512) is wrapped around the cylinder magnetic ring (503). The lower sealing end cover (515) is formed with an air intake channel (5151) connected to the second solenoid valve (4) through a pipeline in the middle along the longitudinal direction, and two air pipes (5152) are extended to the left and right sides respectively, one of which is used for exhaust and is provided with a separator outward one-way valve (6), and the other air pipe (5152) is used as a pressure measuring port, which is connected to the separator negative pressure sensor (7) through an inward one-way valve.For measuring the pressure in the cylinder (509), the separator piston (516) forms a piston shaft (5163) at the bottom. The piston shaft (5163) is adapted to the upper end of the air inlet channel (5151) of the lower sealing end cover (515). The piston shaft sealing ring (501) is provided on the piston shaft (5163). A plurality of cylinder magnetic sensors (517) are provided at intervals along the height direction of the outer surface of the cylinder (509).

5. The ultra-vacuum separation device for dissolving air in hydraulic oil according to claim 4, characterized in that: The piston type oil and gas content measuring instrument (9) comprises an end cover transition plate (901), an oil-containing shaft sleeve (902), a bottom sealing end cover (903), a measuring instrument cylinder (904), a measuring instrument magnetic ring (905), a measuring instrument piston YCC sealing ring (906), a top cover sealing ring (907), a top sealing end cover (908), a sealing buffer (909), a measuring instrument piston (910), a piston pull rod (911), a wire sensor fixing frame (912), a wire sensor (913), a connecting rod (914) and a Y-type joint (915), the top sealing end cover (908) and the bottom sealing end cover (903) The top and bottom of the measuring cylinder (904) are respectively arranged, and the top sealing end cover (908) extends a measuring oil pipe (9081) to the left and right sides respectively. One measuring oil pipe (9081) is connected to the third solenoid valve (12) and the first ball valve (10) through a pipeline, and the other measuring oil pipe (9081) is connected to the measuring negative pressure sensor (8). The top cover sealing ring (907) is arranged on the contact surface between the top sealing end cover (908) and the top of the measuring cylinder (904). The bottom sealing end cover (903) is supported on the end cover transition plate (901) and passes through the end cover transition plate (901). The measuring piston (910) is arranged in the measuring cylinder (904), the measuring piston YCC sealing ring (906) has a pair, which is arranged on the measuring piston (910) at intervals. The measuring magnetic ring (905) is arranged on the measuring piston (910) and is located between a pair of top cover sealing rings (907). The piston pull rod (911) is located below the measuring piston (910) and the top end is fixedly connected to the measuring piston (910) by a screw. The top sealing end cover (908) is provided with the sealing buffer (909) on the inner wall facing the screw. The bottom end of the piston pull rod (911) passes through the bottom sealing end cover ( The oil-containing shaft sleeve (902) in the piston rod (903) extends downward and is connected to the Y-type joint (915), the Y-type joint (915) is connected to a gravity block, the wire sensor fixing frame (912) is fixedly connected to the end cover transition plate (901), the wire sensor (913) is fixed on the wire sensor fixing frame (912), the bottom end of the piston pull rod (911) is also connected to one end of the connecting rod (914), and the other end of the connecting rod (914) is connected to the wire head of the wire sensor (913), and the wire sensor (913) is used to collect displacement data of the measuring device piston (910).

6. The ultra-vacuum separation device for dissolving air in hydraulic oil according to claim 3, characterized in that: The invention also includes a device fixing plate (18), wherein the separation oil cylinder (1), the excitation plate assembly (2), the second pressure reducing valve (3), the second solenoid valve (4), the electric piston separator (5), the separator outward one-way valve (6), the separator negative pressure sensor (7), the measuring device negative pressure sensor (8), the piston type oil and gas content measuring device (9), the first ball valve (10), the second ball valve (11), the third solenoid valve (12), the oil pump (13), the first pressure reducing valve (16) and the first solenoid valve (17) are arranged on the device fixing plate (18), and the wire rope vibration isolator (202) is used to reduce the vibration transmitted to the device fixing plate (18).

7. A separation method of a hydraulic oil-dissolved air ultra-vacuum separation device as claimed in claim 5, characterized in that: The steps include: S1) Oil filling: the oil pump (13) delivers crude oil from the negative pressure crude oil tank (15) to the separation oil cylinder (1). By switching the first solenoid valve (17), the separation oil cylinder (1) can be filled with oil from the left cylinder and discharged from the right cylinder, or filled with oil from the right cylinder and discharged from the left cylinder; S2) Vacuum separation and air extraction. After the oil fills the separation cylinder (1), the first solenoid valve (17) is closed to cut off the oil filling and discharging pipelines. The second solenoid valve (4) is then opened to connect the air extraction pipeline. The screw motor (507) drives the separator piston (516) to move upward. When the separation pressure is reached, the dissolved air in the oil is extracted. The second solenoid valve (4) is then closed. The screw motor (507) drives the separator piston (516) in the opposite direction to discharge the extracted air from the cylinder (509). The separator piston (516) moves up and down N times until the standard requirements are met. S3) measuring the gas content, injecting a small amount of separated hydraulic oil into the piston-type oil-gas content measuring device (9), recording the displacement of the wire displacement sensor (913) at this moment, and then releasing the gravity block until the value of the measuring device negative pressure sensor (8) reaches the set pressure value for the first time, reading the displacement of the wire displacement sensor (913), and obtaining the oil gas content; S4) drains the oil into the negative pressure isolation oil tank (14), switches the first solenoid valve (17), connects the third solenoid valve (12), starts the oil pump (13), and if the left cylinder of the separation oil cylinder (1) is full of oil, then injects crude oil into the right cylinder of the separation oil cylinder (1), and then drains the oil in the left cylinder of the separation oil cylinder (1) into the negative pressure isolation oil tank (14) through the isolation piston ring (102).

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