Airtight oil injection and exhaust device and system for electro-hydraulic actuating mechanism

Abstract

The utility model provides an airtight oil injection and exhaust device for an electro-hydraulic actuating mechanism, which comprises a filling gun component, an oil injection component and an exhaust component, the first oil storage barrel is used for storing oil; the filling mechanism is used for filling the oil liquid in the first oil storage barrel into the electro-hydraulic actuating mechanism; the filling mechanism comprises a first oil pump connected with the first oil storage barrel and a filling valve set connected with the filling gun assembly. And the air tightness testing mechanism is used for detecting the air tightness of the electro-hydraulic actuating mechanism, the air tightness testing mechanism comprises an air tightness tester and an air tightness valve group, the air tightness valve group is communicated with the filling gun assembly, and the air tightness tester is communicated with an air source. By means of the device, the three steps of air tightness, oil injection and exhaust can be achieved on the electro-hydraulic actuator at a time, compared with distributed operation and manual operation, the efficiency is improved, the oil injection standard of the electro-hydraulic actuator is achieved through automatic oil injection, and the situation that oil injection is insufficient or an oil tank of the electro-hydraulic actuator is exploded is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the hydraulic field, especially, a kind of air-tight oil injection exhaust device and system for electro-hydraulic actuator. BACKGROUND

[0002] Electro-hydraulic actuator includes split and integral, split electro-hydraulic actuator oil pipe is longer, empty and cycle difficult in specified time, rely on the pressure generated by the opening valve block hydraulic valve of oil tank, cause system pressure to rise to set pressure, directly stop oiling;Integral straight stroke electro-hydraulic actuator straight oil cylinder oil return port is not at the highest point, when oil circulation, highest liquid level is oil return port position, plus oil injection back suction operation, oil in oil cylinder reduces, oil injection is not full.

[0003] At present, electro-hydraulic actuator oil injection device on market is mostly manual oil injection and semi-automatic oil injection, air-tight, oil injection and empty after oil injection of electro-hydraulic actuator all need to be completed by distribution, leading to low oil injection efficiency.

[0004] At the same time, for the electro-hydraulic actuator of larger oil tank, there is oil-gas separator capacity limit in oil injection equipment, and the oiling amount is 0-50L each time, which needs to be filled multiple times during filling process, and needs to wait for oil-gas separation of oil-gas separator, so that filling time is long, and oil injection efficiency is low.

[0005] In addition, the oil injection equipment can only add normal temperature hydraulic oil, and the oil-gas separator is arranged in the equipment for oil storage, without recycling function, and the oil injection type cannot be arbitrarily switched. The principle of the original equipment is constant-pressure oiling of oil tank opening, and whether the oil tank is full is judged by the pressure of oil tank. This principle leads to that the oil tank must be full, which may cause the oil tank to burst during oil injection process, and the full oil tank does not conform to actual use.

[0006] There is still a large amount of air in the electro-hydraulic actuator after oil injection, which leads to the crawling phenomenon of oil cylinder during impact test, and subsequent emptying needs to be completed by manual device combined with internal program, so that the labor intensity is large;Manual oil injection and manual emptying waste a lot of time, affect production efficiency, and product quality cannot be controlled. During the work of oil injection workstation, test records and test results are mostly recorded and judged manually, so that product quality and reliability cannot be guaranteed, filling amount is artificially judged, and the difference is large, without strict oil injection standard. UTILITY MODEL CONTENTS

[0007] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide an air-tight oil injection exhaust device and system for electro-hydraulic actuator, to solve the problems of unqualified oil injection and low oil injection efficiency caused by manual oil injection and manual emptying in the prior art.

[0008] To achieve the above-mentioned purpose and other related purposes, the utility model provides an air-tight oil injection exhaust device for electro-hydraulic actuator, comprising:

[0009] The filling gun assembly comprises three filling ports corresponding to the three ports of the electro-hydraulic actuator;

[0010] The first oil storage tank is used for storing oil;

[0011] The filling mechanism is used for filling the oil in the first oil storage tank into the electro-hydraulic actuator, and comprises a first oil pump connected with the first oil storage tank and a filling valve group connected with the filling gun assembly.

[0012] The air tightness testing mechanism is used for detecting the air tightness of the electro-hydraulic actuator, and comprises an air tightness tester and an air tightness valve group, wherein the air tightness valve group is communicated with the filling gun assembly, and the air tightness tester is communicated with a gas source.

[0013] Further, a filter is connected between the air tightness tester and the gas source.

[0014] Further, a flow switch is connected between the outlet end of the first oil pump and the flow meter, and a flow meter is arranged between the flow switch and the filling valve group, and a filling reversing valve is connected between the flow meter and the filling valve group.

[0015] Further, a one-way valve is arranged between the outlet end of the first oil pump and the flow switch, and a pressure gauge is arranged between the flow switch and the flow meter.

[0016] Further, the filling mechanism further comprises a second oil storage tank and a second oil pump, the inlet of the second oil pump is communicated with the second oil storage tank, and the outlet of the second oil pump is communicated with the first oil storage tank; a liquid level meter is arranged in the first oil storage tank.

[0017] Further, a rotating mechanism is arranged at the bottom of the second oil storage tank, the rotating mechanism comprises a base frame, a rotating table and a rotating power, the rotating table is installed on the base frame, the rotating power is used for controlling the rotation of the rotating table, the second oil storage tank is placed on the rotating table, an oil pumping assembly is installed on the upper part of the base frame, and the oil pumping assembly is connected with the second oil pump.

[0018] Further, a plurality of positioning pins are arranged on the circumference of the rotating table.

[0019] Further, the oil pumping assembly comprises a first support, an oil pumping rod and a first lifting piece, the first lifting piece is installed on the first support, the oil pumping rod is installed on the first lifting piece, and the oil pumping rod is connected with the second oil pump.

[0020] Further, the oil pumping assembly further comprises a sensor, a second support and a second lifting piece, the second lifting piece is installed on the second support, and the sensor is installed on the second lifting piece.

[0021] In another aspect, the application also provides a gas-tight oil filling and exhaust system for an electro-hydraulic actuator, comprising two sets of the above-mentioned gas-tight oil filling and exhaust device, one set for low-temperature oil and the other set for normal-temperature oil.

[0022] As described above, the utility model has the following beneficial effects: the three ports of the electro-hydraulic actuator are connected with the three filling ports of the filling gun assembly, the gas-tight test mechanism is used for gas-tight detection before oil filling, and the filling mechanism is used for oil filling after passing the test, the filling valve group is provided, oil filling can be performed multiple times, and whether the oil is filled to the brim can be determined by the filling valve group. After oil filling, the pump in the electro-hydraulic actuator is started, the three ports of the electro-hydraulic actuator are connected with the filling gun assembly, and the oil circulates in the electro-hydraulic actuator to automatically exhaust. The device provided by the application can realize the three steps of gas-tightness, oil filling and exhaust for the electro-hydraulic actuator at one time, the efficiency is improved compared with distributed performance and manual operation, and automatic oil filling ensures the oil filling standard of the electro-hydraulic actuator, and the oil tank of the electro-hydraulic actuator will not be overfilled. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure diagram of the gas-tight oil filling and exhaust device for the electro-hydraulic actuator is provided.

[0024] Figure 2 The structure diagram of the rotating mechanism Figure 1 ;

[0025] Figure 3 The structure diagram of the rotating mechanism Figure 2 ;

[0026] Figure 4 The structure diagram of the oil extraction assembly

[0027] Figure 5 The principle diagram of the gas-tight oil filling and exhaust device.

[0028] PART NUMBER EXPLANATION

[0029] 1- Filling gun assembly, 2- First oil storage tank, 3- Filling mechanism, 301- First oil pump, 302- One-way valve, 303- Oil filter, 304- Flow switch, 305- Flow meter, 306- First filling valve, 307- Second filling valve, 308- Third filling valve, 309- Fourth filling valve, 310- Filling directional valve, 311- Cylinder directional valve, 312- Second oil tank, 313- Second oil pump, 314- Level gauge, 4- Air tightness testing machine Structure, 401-Air filter, 402-Air tightness tester, 403-Air tightness valve, 5-First vent valve, 6-Second vent valve, 7-Bubble detector, 8-Overflow valve, 9-Rotating mechanism, 901-Base frame, 902-Turntable, 903-Rotation power, 904-Positioning pin, 905-First bracket, 906-Suck rod, 907-First lifting component, 908-Second bracket, 909-Sensor, 910-Second lifting component, 911-Support wheel. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0031] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0032] In order to describe this utility model in detail, the following is a detailed description of the airtight oil injection and exhaust device and system for electro-hydraulic actuators.

[0033] like Figures 1 to 5The utility model provides a kind of air-tight oil injection exhaust device for electro-hydraulic actuator, including first rack, second rack, gunning gun assembly 1, first oil storage bucket 2, filling mechanism 3 and air-tight test mechanism 4.Gunning gun assembly 1 includes three filling ports, for corresponding with the three ports of electro-hydraulic actuator, and gunning gun assembly 1 is installed on first rack.First oil storage bucket 2 is used to store oil, and first oil storage bucket 2 is installed on second rack.Filling mechanism 3 is used to fill the oil in first oil storage bucket 2 into electro-hydraulic actuator.Filling mechanism 3 includes the first oil pump 301 connected with first oil storage bucket 2 and the filling valve group connected with gunning gun assembly 1, and first oil pump 301 is installed on second rack, and filling valve group is installed on first rack.Air-tight test mechanism 4 is used to detect the air-tightness of electro-hydraulic actuator, and air-tight test mechanism 4 includes air-tight tester 402 and air-tight valve group, and air-tight valve group is communicated with gunning gun assembly 1, and air-tight tester 402 is communicated with gas source.Air-tight tester 402 is installed on second rack, and air-tight valve group is installed on first rack.Of course, all can be installed on a rack, and two racks in the embodiment are provided to facilitate observation.

[0034] The gas flowing through gas source may contain impurities, so the gas is filtered by air filter 401 before entering electro-hydraulic actuator, and air filter 401 is installed at the front end of air-tight tester 402.Air control valve is also provided between air-tight tester 402 and air-tight valve group, and air-tight tester 402 inflates electro-hydraulic actuator, and air control valve controls the passage of gas.

[0035] The three ports of electro-hydraulic actuator are upper oil cylinder filling port, lower oil cylinder filling port and oil tank filling port, and the corresponding gunning gun assembly 1 is upper oil cylinder gun, lower oil cylinder gun and oil tank gun, and the three ports are one-to-one corresponding with the three oil guns, and are connected by quick-change connector.

[0036] The gas is first filtered by air filter 401, then comes out of air-tight tester 402, is controlled by air control valve and then inflates electro-hydraulic actuator by air-tight valve group.The inflation parameters can be adjusted by air-tight tester 402, and the data of electro-hydraulic actuator is recorded within a specified time after inflation is completed, and air-tight tester 402 directly feedbacks whether the air-tightness of electro-hydraulic actuator is qualified.

[0037] In some embodiments, when the electro-hydraulic actuator is filled with oil, the first oil pump 301 is turned on, and in order to control the amount of oil filled, a flow meter 305 is generally used to control the flow in the filling pipeline. A one-way valve 302 is provided in the oil filling pipeline to prevent backflow of oil, a flow switch 304 is used to control the flow, an oil filter 303 is used to filter the oil, a pressure gauge is used to monitor the oil pressure in the filling pipeline, and the total amount of oil input into the electro-hydraulic actuator is recorded by the flow meter 305. The positions of the one-way valve 302, the flow switch 304, and the oil filter 303 can be exchanged, and the positions of the pressure gauge and the flow meter 305 can be exchanged, but the flow meter 305 is preferably located before the filling valve group, which includes filling valves connected to the three oil guns of the filling gun assembly 1, a filling reversing valve 310 for controlling the filling direction, and a cylinder reversing valve 311. The trigger pressure of the filling reversing valve 310 can be set, and the filling reversing valve 310 is used to determine the position of the cylinder piston rod.

[0038] After the air tightness test, the amount of oil and the type of hydraulic oil are determined by scanning the model of the electro-hydraulic actuator, and the first oil pump 301 starts to work. The oil passes through the one-way valve 302, the oil filter 303, the flow switch 304, the pressure gauge, and the flow meter 305 to record the total amount of oil input into the electro-hydraulic actuator; further, the cylinder piston rod position is determined by the filling reversing valve 310. During filling, the upper oil chamber of the cylinder of the electro-hydraulic actuator is filled first, and when the piston rod is fully extended and the upper oil chamber of the cylinder is filled with oil, the cylinder reversing valve 311 and the filling reversing valve 310 are reversed, and the lower oil chamber of the cylinder of the electro-hydraulic actuator is filled. When the lower oil chamber of the cylinder is filled with oil, the oil enters the oil tank filling gun, and the oil tank is filled with oil. The filling reversing valve 310 is used to control the start and end of oil filling, and after the oil tank cylinder is filled with oil, the switch is turned off to give a signal, and the first oil pump 301 stops working. The oil filling time is adjusted according to the flow switch 304 and the model of the electro-hydraulic actuator.

[0039] As Figure 5As shown, the front ends of the oil gun above the oil cylinder, the oil gun below the oil cylinder and the oil tank oil gun are respectively provided with the first filling valve 306, the second filling valve 307 and the third filling valve 308. The first end of the filling reversing valve 310 is connected with the flow meter 305. The second end of the filling reversing valve 310 is connected with the first end of the oil cylinder reversing valve 311. The second end of the oil cylinder reversing valve 311 is connected with the first end of the first filling valve 306. The third end of the oil cylinder reversing valve 311 is connected with the first end of the second filling valve 307. The fourth end of the oil cylinder reversing valve 311 is connected with the first end of the first vent valve 5 and the second vent valve 6. The second end of the first filling valve 306 is connected with the oil gun above the oil cylinder. The second end of the second filling valve 307 is connected with the oil gun below the oil cylinder. The second end of the first vent valve 5 is connected with the oil gun above the oil cylinder. The second end of the second vent valve 6 is connected with the oil gun below the oil cylinder. The first ends of the first vent valve 5 and the second vent valve 6 are also connected with the second end of the bubble detector 7. The bubble detector 7 is used for detecting the gas in the oil liquid when the oil is discharged.

[0040] The second end of the flow meter 305 is also connected with the overflow valve 8. The second end of the overflow valve 8 is connected with the first end of the third filling valve 308. The second end of the third filling valve 308 is connected with the oil tank oil gun. The second end of the overflow valve 8 is also connected with the fourth filling valve 309. The second end of the fourth filling valve 309 is connected with the first end of the bubble detector 7.

[0041] In order to conveniently observe the liquid level of the first oil storage barrel 2, the upper part of the first oil storage barrel 2 is generally transparent or a liquid level gauge 314 is installed in the first oil storage barrel 2. For the electro-hydraulic actuator with a large oil tank, the oil injection amount is large, and therefore it is necessary to keep the oil liquid in the first oil storage barrel 2 sufficient. If the existing transport oil barrel on the market is directly used as the first oil storage barrel 2, the liquid level in the barrel cannot be directly observed, and it is not possible to ensure that the first oil storage barrel 2 always has oil. Therefore, the oil injection mechanism of the embodiment further comprises a second oil storage barrel 312 and a second oil pump 313. The first oil storage barrel 2 directly supplies oil to the electro-hydraulic actuator through the first oil pump 301, and the oil liquid condition in the first oil storage barrel 2 can be obtained in real time through the liquid level gauge 314. The inlet of the second oil pump 313 is communicated with the second oil storage barrel 312. The outlet of the second oil pump 313 is communicated with the first oil storage barrel 2. The oil liquid is transferred from the second oil storage barrel 312 to the first oil storage barrel 2 through the second oil pump 313. The first oil storage barrel 2 is replenished in real time, and it is ensured that the oil liquid in the first oil storage barrel 2 is sufficient.

[0042] The second oil storage barrel 312 is a conventional oil storage barrel on the market. The position of the oil barrel mouth of the second oil storage barrel 312 is not fixed after transportation. In order to realize automatic oil replenishment, the embodiment is provided with a rotating mechanism 9. The second oil storage barrel 312 is hoisted to the rotating mechanism 9 by hoisting equipment for rotation.

[0043] The rotating mechanism 9 comprises a base frame 901, a rotating table 902 and a rotating power 903, the rotating table 902 is installed at the bottom of the base frame 901, the rotating power 903 is used for controlling the rotation of the rotating table 902, the second oil storage barrel 312 is placed on the rotating table 902, a plurality of positioning pins 904 are arranged on the circumference of the rotating table 902, the second oil storage barrel 312 is positioned by the positioning pins 904, the rotating speed of the rotating mechanism 9 is relatively slow, and the second oil storage barrel 312 rotates together with the rotating table 902 through friction.

[0044] The rotating power 903 can be directly connected with the rotating table 902 or be driven in other manners, in some embodiments, the rotating motor is connected with a pinion, the pinion is engaged with a gear wheel, the gear wheel is fixedly connected with the rotating table 902, so that the rotating motor drives the rotating table 902 to move, a plurality of rotating motors and pinions can be arranged on the base frame 901, or the pinion and the gear wheel can be connected in a belt mode.

[0045] In order to make the rotating table 902 move smoothly, a plurality of supporting wheels 911 are arranged on the base frame 901, in the embodiment, the supporting wheels 911 are arranged on the four corners of the base frame 901, the supporting wheels 911 are in contact with the bottom of the rotating table 902, and the rotation of the rotating table 902 is smoother through the supporting wheels 911.

[0046] The upper portion of the base frame 901 is provided with an oil pumping assembly, and the oil pumping assembly is connected with the second oil pump 313. The oil pumping assembly comprises a first support 905, an oil pumping rod 906 and a first lifting piece 907, the first lifting piece 907 is installed on the first support 905, and the oil pumping rod 906 is installed on the first lifting piece 907. The oil pumping rod 906 is connected with the second oil pump 313.

[0047] The oil pumping assembly further comprises a sensor 909, a second support 908 and a second lifting piece 910, the second lifting piece 910 is installed on the second support 908, and the sensor 909 is installed on the second lifting piece 910. The first support 905 and the second support 908 are installed on the second rack.

[0048] After the second oil storage barrel 312 is placed on the rotating table 902, the oil barrel cover is manually opened, and the oil barrel opening of the second oil storage barrel 312 is detected by the sensor 909. Since the height of the second oil storage barrel 312 can be different, the second support 908 and the second lifting piece 910 are arranged, and the position of the sensor 909 is controlled by the second lifting piece 910.

[0049] After the sensor 909 detects the oil tank opening of the second oil tank 312, the first lifting piece 907 controls the oil pumping rod 906 to descend into the second oil tank 312, and when the liquid level meter 314 of the first oil tank 2 detects that the liquid level is lower than the preset liquid level, the second oil pump 313 works to pump the oil in the second oil tank 312 into the first oil tank 2, and the second oil pump 313 and the first oil pump 301 are not interfered with each other during the filling process of the electro-hydraulic actuator.

[0050] In another aspect, the utility model also provides a kind of air-tight oil filling exhaust system for electro-hydraulic actuator, including two sets of above-mentioned air-tight oil filling exhaust device, one set is used for low temperature oil, another set is used for normal temperature oil, and two sets of device are arranged in parallel, and do not interfere with each other.

[0051] Working process: as Figure 5 As shown, the upper oil filling port A of the oil cylinder, the lower oil filling port B of the oil cylinder and the oil tank oil filling port T of the electro-hydraulic actuator are connected with the upper oil filling gun, the lower oil filling gun and the oil tank oil filling gun of the filling gun assembly 1.

[0052] Air-tight detection: air source is sequentially connected with filling gun assembly 1 by air filter 401, air-tight tester 402 and three air-tight valves 403 for inflation, and the air-tightness of the electro-hydraulic actuator is observed by air-tight tester 402.

[0053] Oil filling process: three air-tight valves 403 are closed, and oil liquid passes through first oil pump 301, check valve 302, oil liquid filter 303, flow switch 304 and flow meter 305. First, the upper oil cavity of the oil cylinder is filled, and the position of the piston rod can be determined by filling reversing valve 310. The third end and the fourth end of the oil cylinder reversing valve 311 are closed, and the oil liquid is filled into the upper oil cavity of the oil cylinder from the first end and the second end of the oil cylinder reversing valve 311. At this time, the second filling valve 307, the third filling valve 308 and the fourth filling valve 309 are closed. After the upper oil cavity of the oil cylinder is filled, the first filling valve 306, the third filling valve 308 and the fourth filling valve 309 are closed, the second filling valve 307 is opened, and the oil cylinder reversing valve 311 fills the lower oil cavity of the oil cylinder through the first end and the third end. After the lower oil cavity of the oil cylinder is filled, the filling reversing valve 310 is closed, the first filling valve 306, the second filling valve 307 and the fourth filling valve 309 are closed, the third filling valve 308 is opened, and the oil liquid passes through the flow meter 305 and then passes through the overflow valve 8 and the third filling valve 308 to fill the oil tank of the electro-hydraulic actuator, and the filling amount is controlled by the flow meter 305.

[0054] Exhaust process: after the oil injection is finished, the first oil pump 301 is closed, the filling reversing valve 310, the oil cylinder reversing valve 311, the first filling valve 306 and the second filling valve 307 are closed, the first vent valve 5, the second vent valve 6, the third filling valve 308 and the fourth filling valve 309 are opened, and the oil in the oil cylinder upper oil chamber, the oil cylinder lower oil chamber and the oil tank flows under the action of the pump of the electro-hydraulic actuator, the oil passes through the bubble detector 7, the amount of bubbles in the oil is detected through the bubble detector 7, the oil is treated by exhaust during circulation, and the circulation is stopped when the bubble detector 7 detects that the gas in the oil is qualified.

[0055] Through the air-tight oil injection and exhaust device, after the three ports of the electro-hydraulic actuator are connected, air-tightness, oil injection and exhaust are automatically completed, and re-plugging is not required in the middle, time is saved, the oil injection amount is guaranteed, manual operation is not required, and labor is saved.

[0056] The above embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used for limiting the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A hermetic oiling and venting device for electro-hydraulic actuators, characterized in that, The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device.

2. The hermetic oil-filling and venting device for electro-hydraulic actuators according to claim 1, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

3. The hermetic oil-filling and venting device for electro-hydraulic actuators according to claim 1, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

4. The hermetic oil-filling and venting device for electro-hydraulic actuators according to claim 3, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

5. The hermetic oil-filling and venting device for electro-hydraulic actuators according to any one of claims 1-4, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

6. The hermetic oil-filling and venting device for electro-hydraulic actuators according to claim 5, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

7. The hermetic oil-filling and venting device for electro-hydraulic actuators according to claim 6, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

8. The hermetic oil filling and venting device for electro-hydraulic actuators according to claim 6, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

9. The hermetic oil-filling and venting device for electro-hydraulic actuators according to claim 8, characterized in that, The application relates to a gas-tight oil-filling and exhaust device.

10. A hermetic oil filling and venting system for an electro-hydraulic actuator, characterized in that, The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. 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The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight oil-filling and exhaust device. The application relates to a gas-tight

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