An electric actuator mechanism that is not prone to oil leakage

Abstract

The present invention discloses an electric actuator mechanism that is not prone to oil leakage, belonging to the technical field of electric actuators, and includes a housing cover and a sealing cover, wherein the sealing cover is arranged at the lower end of the housing cover; an output shaft, wherein the output shaft is arranged inside the housing cover, and the lower end of the output shaft is movable through the housing cover and the sealing cover in sequence and extends to the outside; an annular airbag, wherein the center of the upper end surface of the sealing cover is concavely designed, and the annular airbag is arranged at the concave part of the sealing cover. When oil leakage occurs between the output shaft and the rubber ring, the permanent magnet will squeeze the annular airbag, so that the rubber ring is tightly attached to the outer wall of the output shaft, thereby effectively preventing the lubricating oil from flowing out from between the rubber ring and the outer wall of the output shaft, and the time node of the oil leakage can be used as historical data to predict the next time of the oil leakage, and the inner circle of the rubber ring is controlled to be tightly attached to the output shaft in advance before the oil leakage time point, thereby eliminating the potential oil leakage gap in advance.

Description

Technical Field

[0001] The present invention relates to the technical field of electric actuators, and more particularly to an electric actuator mechanism which is not prone to oil leakage. Background Art

[0002] An electric actuator is a device that receives electrical signals and drives a motor or electromagnetic device to control and operate a mechanical system. Electric actuators are often used to control the switching and adjustment of various valves, pumps, conveyor belts and other equipment. The working principle of an electric actuator mainly includes three aspects: the motor, the transmission mechanism and the control system. When receiving a control signal, the motor inside the electric actuator will rotate, and the transmission mechanism (such as screw drive, gear drive, etc.) will convert the rotational motion into linear motion or angle adjustment, thereby realizing the motion control of the actuator.

[0003] The transmission mechanism of the electric actuator is generally filled with lubricating oil for lubricating and cooling the transmission mechanism. In the prior art, in order to prevent the lubricating oil from leaking from the output shaft of the electric actuator, an O-ring is generally installed at the connection between the output shaft and the outside world, and the sealing operation is achieved through the O-ring. However, in daily use, the frequent rotation of the output shaft will cause friction with the sealing ring, which will cause damage to the sealing ring over time, resulting in a decrease in the sealing effect and causing the lubricating oil leakage problem. The leakage of oil will not only cause environmental pollution, but also affect the normal operation of the electric actuator, such as reducing transmission efficiency, increasing wear, and even causing malfunctions and shutdowns.

[0004] In view of this, in view of the above-mentioned deficiencies, the present invention improves and optimizes the electric actuator in the prior art and develops an electric actuator mechanism that is not prone to oil leakage. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide an electric actuator mechanism that is not prone to oil leakage. When oil leakage occurs between the output shaft and the rubber ring, the permanent magnet will squeeze the annular airbag to make the rubber ring close to the outer wall of the output shaft, thereby effectively preventing the lubricating oil from flowing out from between the rubber ring and the outer wall of the output shaft. The time node of the oil leakage can also be used as historical data to predict the next time of the oil leakage. At the moment before the oil leakage time point, the inner circle of the rubber ring is controlled to fit tightly to the output shaft in advance, thereby eliminating the potential oil leakage gap in advance.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] An electric actuator mechanism that is not prone to oil leakage, comprising:

[0008] A housing cover and a sealing cover, wherein the sealing cover is arranged at the lower end of the housing cover;

[0009] An output shaft, wherein the output shaft is arranged inside the housing cover, and the lower end of the output shaft is movable through the housing cover and the sealing cover in sequence and extends to the outside;

[0010] An annular airbag, wherein the center of the upper end surface of the sealing cover is concavely designed, and the annular airbag is arranged in the concave part of the sealing cover;

[0011] A rubber ring, wherein the rubber ring is arranged on the inner surface of the annular airbag, and the inner surface of the rubber ring is initially in close contact with the outer surface of the output shaft;

[0012] A cavity, wherein the cavity is provided in the rubber ring and has an annular design;

[0013] A detection component, the detection component is arranged in the sealing cover, and the detection component is used to detect the air pressure change in the cavity;

[0014] An extrusion assembly, the extrusion assembly is arranged below the annular airbag, and the extrusion assembly is used to extrude the annular airbag;

[0015] A fixing component is arranged beside the annular airbag and is used to stabilize the annular airbag after being squeezed.

[0016] Furthermore, the detection component includes:

[0017] A hard plate, the hard plate being fixedly connected to the upper and lower ends of the inner wall of the cavity;

[0018] an airway tube, one end of which is connected to the hard plate, and the interior of the airway tube is in communication with the interior of the cavity;

[0019] A hollow chamber, wherein the hollow chamber is opened inside the sealing cover, an end of the air duct away from the hard plate is connected to the hollow chamber, and the interior of the hollow chamber is communicated with the interior of the air duct;

[0020] An air pressure sensor installed inside the cavity;

[0021] The processing unit is installed outside the housing cover and is electrically connected to the air pressure sensor.

[0022] Further, the extrusion assembly comprises:

[0023] An electromagnet, the electromagnet being disposed below the annular airbag and electrically connected to the processing unit;

[0024] The permanent magnet is arranged above the electromagnet and has a ring-shaped structure. When the electromagnet is energized, an upward magnetic repulsive force is generated on the permanent magnet.

[0025] Further, the fixing assembly comprises:

[0026] A sleeve, wherein the sleeve is fixedly mounted on the left and right ends of the permanent magnet;

[0027] An elastic component, wherein the elastic component is installed inside the sleeve;

[0028] Bevel teeth, wherein the bevel teeth are sleeved in the sleeve, and one end of the bevel teeth located in the sleeve is fixedly connected to the elastic component, and the bevel surface of the bevel teeth is arranged upward;

[0029] The inclined tooth grooves are arranged at the left and right ends of the inner wall of the recessed part of the sealing cover.

[0030] Furthermore, a pressure threshold in the cavity is preset. If the pressure in the cavity is lower than the preset threshold, the processing unit controls the electromagnet to be energized and pushes the permanent magnet to squeeze the annular airbag. If the pressure in the cavity reaches the preset threshold, the processing unit controls the electromagnet to be de-energized.

[0031] Furthermore, the processing unit records in real time the time node when the air pressure in the cavity is lower than a preset air pressure threshold, and uses the historical data to predict the next time node when the air pressure in the cavity is lower than the preset threshold, and at the previous moment when the air pressure in the cavity is lower than the preset threshold, the processing unit controls the electromagnet to be energized.

[0032] Further, including:

[0033] Conductive rubber is embedded in the rubber ring. When the conductive rubber is in an initial state, one side end of the conductive rubber contacts the outer side surface of the output shaft, and both upper and lower ends of the conductive rubber are electrically connected to the processing unit.

[0034] Further, including:

[0035] A wireless sending module and a wireless receiving module are installed outside the housing cover, and the wireless sending module and the wireless receiving module are electrically connected to the processing unit.

[0036] Further, including:

[0037] A sealing ring is arranged between the housing cover and the sealing cover.

[0038] Furthermore, the elastic component is a spring or a spring.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) In this scheme, when oil leakage occurs between the output shaft and the rubber ring, the permanent magnet will squeeze the annular airbag to make the rubber ring close to the outer wall of the output shaft, which can effectively prevent the lubricating oil from flowing out from between the rubber ring and the outer wall of the output shaft. The time node of the oil leakage can also be used as historical data to predict the next time of the oil leakage. Before the oil leakage time point, the inner circle of the rubber ring is controlled to fit tightly to the output shaft in advance to eliminate the potential oil leakage gap in advance. Through real-time monitoring and prediction, the entire control system can take preventive measures before the oil leakage actually occurs, effectively avoiding the oil leakage problem caused by the wear of the rubber ring, improving the reliability and safety of the equipment, and preventive maintenance can reduce the number of shutdowns and repairs caused by oil leakage, reducing maintenance costs and production losses caused by shutdowns. By using air pressure sensors and processing units, accurate monitoring and prediction of oil leakage is achieved, improving the pertinence and efficiency of maintenance work.

[0041] (2) This solution can measure the current change in the conductive rubber circuit to know the wear condition of the rubber ring, and can also express the life of the rubber ring in a numerical way. This numerical representation method enables the staff to intuitively understand the use of the rubber ring, so as to take maintenance or replacement measures in time to ensure the normal operation and safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 This is an appearance view of the overall structure of the present invention;

[0044] Figure 2 It is a partial cross-sectional view of the present invention at the sealing cover;

[0045] Figure 3 For the present invention Figure 2 Magnified view at A in the middle;

[0046] Figure 4 It is a structural schematic diagram of the permanent magnet of the present invention;

[0047] Figure 5 is a cross-sectional view of the rubber ring of the present invention;

[0048] Figure 6 Schematic diagram of the structure of the conductive rubber of the present invention.

[0049] Description of the numbers in the figure:

[0050] 1. Shell cover; 2. Sealing cover; 3. Output shaft; 4. Annular airbag; 5. Rubber ring; 6. Electromagnet; 7. Permanent magnet; 8. Sleeve; 9. Elastic component; 10. Bevel teeth; 11. Bevel tooth grooves; 12. Cavity; 13. Hard board; 14. Air guide tube; 15. Cavity; 16. Air pressure sensor; 17. Conductive rubber; 18. Sealing ring. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0052] See also Figures 1 to 6 , an electric actuator mechanism that is not prone to oil leakage, comprising a housing cover 1 and a sealing cover 2, the sealing cover 2 being arranged at the lower end of the housing cover 1; an output shaft 3, the output shaft 3 being arranged inside the housing cover 1, the lower end of the output shaft 3 being movable through the housing cover 1 and the sealing cover 2 in sequence and extending to the outside; an annular airbag 4, the center of the upper end surface of the sealing cover 2 being concavely designed, the annular airbag 4 being arranged at the concave part of the sealing cover 2; a rubber ring 5, the rubber ring 5 being arranged on the inner ring surface of the annular airbag 4, the inner ring surface of the rubber ring 5 being in an initial state close to the outer side surface of the output shaft 3; a cavity 12, the cavity 12 being opened in the rubber ring 5, and the cavity 12 being annularly designed;

[0053] A detection component, which is arranged in the sealing cover 2, and is used to detect the air pressure change in the cavity 12; the detection component includes: a hard plate 13, which is fixedly connected to the upper and lower ends of the inner wall of the cavity 12; an air duct 14, one end of which is connected to the hard plate 13, and the interior of the air duct 14 is interconnected with the interior of the cavity 12; an empty cavity 15, which is opened in the interior of the sealing cover 2, and one end of the air duct 14 away from the hard plate 13 is connected to the empty cavity 15, and the interior of the empty cavity 15 is interconnected with the interior of the air duct 14; an air pressure sensor 16, which is installed in the interior of the empty cavity 15; a processing unit, which is installed on the outside of the housing cover 1, and the processing unit is electrically connected to the air pressure sensor 16;

[0054] An extrusion assembly is arranged below the annular airbag 4 and is used to extrude the annular airbag 4; the extrusion assembly includes: an electromagnet 6, which is arranged below the annular airbag 4 and is electrically connected to the processing unit; a permanent magnet 7, which is arranged above the electromagnet 6 and has an annular structure design. When the electromagnet 6 is energized, it will generate an upward magnetic repulsion force on the permanent magnet 7;

[0055] A pressure threshold in the cavity 12 is preset. If the pressure in the cavity 12 is lower than the preset threshold, the processing unit controls the electromagnet 6 to be energized and pushes the permanent magnet 7 to squeeze the annular airbag 4. If the pressure in the cavity 12 reaches the preset threshold, the processing unit controls the electromagnet 6 to be de-energized.

[0056] By adopting the above technical solution, the output shaft 3 will rub against the rubber ring 5 when rotating. After working for a long time, the rubber ring 5 will be worn. It should be noted that the preset threshold value in the cavity 12 is higher than the normal atmospheric pressure, that is, the cavity 12 is in a compressed state at this time. In addition, the preset threshold value can be an air pressure range or an exact air pressure value. The rubber ring 5 is made of elastic material. After the rubber ring 5 is worn and lost, a gap will appear between the rubber ring 5 and the output shaft 3. At this time, the rubber ring 5 will be deformed and expanded under the action of the air pressure in the cavity 12, and approach the outer wall of the output shaft 3, and finally stick to the outer wall of the output shaft 3. At this time, the rubber ring 5 is not very tightly attached to the output shaft 3. When the temperature in the housing cover 1 rises and the air pressure rises, lubricating oil will flow out from between the rubber ring 5 and the outer wall of the output shaft 3. Therefore, when the cavity 12 of the present invention is expanded, the internal air pressure will decrease because the cavity 15 is connected to the cavity 12 through the air guide tube 14, and the air pressure sensor 16 will detect that the air pressure in the cavity 12 is reduced. At this time, the processing unit will control the electromagnet 6 to be energized, and the electromagnet 6 will give the permanent magnet 7 an upward magnetic repulsion to push the permanent magnet 7 to move upward. When the permanent magnet 7 moves upward, it will squeeze the annular airbag 4. After the annular airbag 4 is squeezed, both the inner and outer circles will be unfolded, because the outer circle of the annular airbag 4 is restricted by the inner wall of the sealing cover 2 and can only be unfolded toward the inner circle. When the annular airbag 4 is unfolded, it will give the rubber ring 5 an extrusion force toward the outer wall of the output shaft 3. Because the rubber ring 5 is restricted by the output shaft 3, the cavity 12 will be compressed, and the internal air pressure will increase. When the air pressure sensor 16 detects that the preset threshold is reached, the processing unit controls the electromagnet 6 to be powered off. At this time, the rubber ring 5 is close to the outer wall of the output shaft 3, which can effectively prevent the lubricating oil from flowing out from between the rubber ring 5 and the outer wall of the output shaft 3. In addition, the upper end of the annular airbag 4 of the present invention is in close contact with the lower end wall of the housing cover 1, so the lubricating oil in the housing cover 1 will not leak from between the annular airbag 4 and the lower end wall of the housing cover 1.

[0057] In some embodiments of the present invention, a fixing component includes: a fixing component arranged next to the annular airbag 4, and the fixing component is used to stabilize the annular airbag 4 after extrusion; the fixing component includes: a sleeve 8, the sleeve 8 is fixedly installed at the left and right ends of the permanent magnet 7; an elastic component 9, the elastic component 9 is installed inside the sleeve 8; a bevel tooth 10, the bevel tooth 10 is sleeved in the sleeve 8, and one end of the bevel tooth 10 located in the sleeve 8 is fixedly connected to the elastic component 9, and the bevel of the bevel tooth 10 is arranged upward; a bevel tooth groove 11, the bevel tooth groove 11 is opened at the left and right ends of the inner wall of the recessed part of the sealing cover 2.

[0058] By adopting the above technical solution, when the permanent magnet 7 moves upward, the sleeve 8 and the bevel tooth 10 will also be driven to move synchronously. When the bevel tooth 10 moves upward, the bevel on the bevel tooth 10 will squeeze the bevel inside the bevel tooth groove 11. After the bevel of the bevel tooth 10 is squeezed, it will move toward the inside of the sleeve 8 and compress the elastic component 9. At this time, the bevel tooth 10 will break away from the bevel tooth groove 11, and as the permanent magnet 7 moves, when it moves to the corresponding position, the previously compressed elastic component 9 will push the bevel tooth 10 to move in the opposite direction. The bevel tooth 10 extends out from the sleeve 8 and finally enters the corresponding bevel tooth groove 11. Because the lower end face of the bevel tooth 10 is a plane, and the lower end inner wall of the bevel tooth groove 11 is a plane, the lower end face of the bevel tooth 10 is blocked by the lower end inner wall of the bevel tooth groove 11, thereby avoiding the permanent magnet 7 from moving downward and ensuring the stable squeezing of the annular airbag 4 by the permanent magnet 7.

[0059] In some embodiments of the present invention, the processing unit records in real time the time node when the air pressure in the cavity 12 is lower than a preset air pressure threshold, and uses the time node as historical data. The historical data is used to predict the next time node when the air pressure in the cavity 12 is lower than the preset threshold, and at the previous moment when the air pressure in the cavity 12 is lower than the preset threshold, the processing unit controls the electromagnet 6 to be energized.

[0060] By adopting the above technical solution, when the electric actuator device operates normally, the rubber ring 5 fits tightly on the output shaft 3 to prevent oil leakage, the cavity 12 is in an unexpanded state, and the air pressure in the cavity 15 is maintained at a relatively stable level. The air pressure sensor 16 continuously monitors this air pressure value. As the device is used, a small gap appears between the rubber ring 5 and the output shaft 3 due to friction and wear, causing oil to start leaking. Because a small gap appears between the rubber ring 5 and the output shaft 3, the inner circular surface of the rubber ring 5 is no longer subjected to extrusion force. At this time, the cavity 12 will expand. This action causes the air pressure in the cavity 15 connected thereto to drop. The air pressure sensor 16 detects the air pressure change in the cavity 15 in real time and transmits the data to the processing unit. The processing unit records the time node each time the air pressure is lower than the preset air pressure threshold. These time nodes constitute historical data. The processing unit uses the historical data to analyze the air pressure change pattern through an algorithm to predict the time node when the air pressure sensor 16 is lower than the preset threshold next time, that is, the time when the cavity 12 is expanded next time (that is, oil leakage is about to occur). Before the predicted oil leakage time point, the processing unit issues an instruction to control the electromagnet 6 to be energized. After the electromagnet 6 is energized, a magnetic repulsion force is generated, which pushes the adjacent permanent magnet 7 to move upward. The movement of the permanent magnet 7 squeezes the annular airbag 4, causing the inner circle of the annular airbag 4 to expand, and then pushes the inner circle of the rubber ring 5 to fit closely to the output shaft 3, eliminating the potential oil leakage gap in advance. After completing the preventive adjustment, the entire control system resumes normal monitoring and waits for the next possible oil leakage warning. Through real-time monitoring and prediction, the entire control system can take preventive measures before the oil leakage actually occurs, effectively avoiding the oil leakage problem caused by the wear of the rubber ring 5, improving the reliability and safety of the equipment, and preventive maintenance can reduce the number of shutdowns and repairs caused by oil leakage, reducing maintenance costs and production losses caused by shutdowns. By using the air pressure sensor 16 and the processing unit, accurate monitoring and prediction of oil leakage is achieved, and the pertinence and efficiency of maintenance work are improved.

[0061] It should be noted that the algorithm analysis of this application can use both time series analysis and machine learning algorithms. Time series analysis can use the following models: Use time series analysis methods such as autoregressive model (AR), moving average model (MA) or autoregressive moving average model (ARMA) to identify potential patterns in air pressure changes;

[0062] The machine learning algorithm can use the following algorithms: Apply machine learning algorithms such as support vector machine (SVM), random forest (RandomForest), neural network (Neural Network), use historical data as a training set, train the prediction model, and during the training process, adjust the model parameters so that the model can accurately predict the air pressure change pattern.

[0063] In some embodiments of the present invention, a conductive rubber 17 is included. The conductive rubber 17 is embedded in the rubber ring 5. When the conductive rubber 17 is in an initial state, one side end of the conductive rubber 17 contacts the outer side surface of the output shaft 3, and the upper and lower ends of the conductive rubber 17 are electrically connected to the processing unit.

[0064] By adopting the above technical solution, the conductive rubber 17 is made by mixing conductive metal powder and rubber in a certain proportion, so that it has the characteristics of rubber and also has conductivity. First of all, it is necessary to know the relationship between the resistance value of the conductive rubber 17 and its physical size (such as length, cross-sectional area). According to the resistance law, the resistance R is proportional to the conductor length L and inversely proportional to the conductor cross-sectional area A, that is, ,in is the resistivity, which is an inherent property of the material. Considering the wear of the conductive rubber 17, when the conductive rubber 17 wears, its length will become shorter, but more importantly, its cross-sectional area will decrease. Since the resistance is inversely proportional to the cross-sectional area, the decrease in cross-sectional area will lead to an increase in resistance. According to Ohm's law If the voltage across the conductive rubber 17 remains unchanged and the resistance increases, the current in the circuit will decrease accordingly.

[0065] In order to monitor the degree of wear of the conductive rubber 17, this electrical characteristic can be used. First, it is necessary to measure and record the circuit current and corresponding size data of the conductive rubber 17 in the initial state (i.e., when not worn). Subsequently, during the use of the conductive rubber 17, by measuring the current value in the circuit and comparing it with the initial current, the size change after wear can be inferred. Since the conductive rubber 17 is installed on the rubber ring 5, and the two will keep synchronization during the wear process, the wear state of the rubber ring 5 can be indirectly evaluated through the wear of the conductive rubber 17. The size of the rubber ring 5 before wear, as well as the corresponding relationship between the current change in the circuit of the conductive rubber 17 and the size change of the rubber ring 5 are measured and recorded in advance. In this way, the processing unit can accurately judge the degree of wear of the rubber ring 5 by monitoring the current in the circuit of the conductive rubber 17.

[0066] By comparing the initial size of the rubber ring 5 with the size after wear, the remaining life of the rubber ring 5 can be calculated. For example, if the expected life of the rubber ring 5 at the initial size is 100%, and it is actually worn away by 20% of the original size, then the remaining life of the rubber ring 5 is 80%. This numerical representation method enables the staff to intuitively understand the use of the rubber ring 5, so as to take maintenance or replacement measures in time to ensure the normal operation and safety of the equipment.

[0067] In some embodiments of the present invention, a wireless transmitting module and a wireless receiving module are included. The wireless transmitting module and the wireless receiving module are both installed outside the housing cover 1 . The wireless transmitting module and the wireless receiving module are electrically connected to the processing unit.

[0068] By adopting the above technical solution, information can be sent to the staff's mobile terminal through the wireless sending module. The information can be the remaining life of the rubber ring 5, the state detected by the air pressure sensor 16, and whether the state is leaking oil at this time, so that the staff can know the working condition of the electric actuator and the condition of the rubber ring 5 in time. The wireless receiving module can also accept control instructions sent by the staff through the mobile terminal, such as controlling whether the electromagnet 6 is energized.

[0069] In some embodiments of the present invention, a sealing ring 18 is included, and the sealing ring 18 is disposed between the housing cover 1 and the sealing cover 2 .

[0070] By adopting the above technical solution, the installed sealing ring 18 can prevent the lubricating oil from leaking from the gap between the housing cover 1 and the sealing cover 2 .

[0071] In some embodiments of the present invention, the elastic component 9 is a spring or a spring.

[0072] By adopting the above technical solution, the spring or the spring sheet can ensure that the elastic component 9 can be compressed and deformed when subjected to pressure.

[0073] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric actuator mechanism that is not prone to oil leakage, characterized in that: include: A housing cover (1) and a sealing cover (2), wherein the sealing cover (2) is arranged at the lower end of the housing cover (1); An output shaft (3), the output shaft (3) being arranged inside the housing cover (1), the lower end of the output shaft (3) movably passing through the housing cover (1) and the sealing cover (2) in sequence and extending to the outside; An annular airbag (4), wherein the center of the upper end surface of the sealing cover (2) is designed to be concave, and the annular airbag (4) is arranged in the concave portion of the sealing cover (2); A rubber ring (5), the rubber ring (5) being arranged on the inner ring surface of the annular airbag (4), the inner ring surface of the rubber ring (5) being in close contact with the outer side surface of the output shaft (3) in an initial state; A cavity (12), wherein the cavity (12) is formed in the rubber ring (5) and has an annular design; a detection component, the detection component being arranged in the sealing cover (2), and being used to detect changes in air pressure in the cavity (12); The detection components include: A hard plate (13), the hard plate (13) being fixedly connected to the upper and lower ends of the inner wall of the cavity (12); An air guide tube (14), one end of the air guide tube (14) being connected to the hard plate (13), and the interior of the air guide tube (14) being in communication with the interior of the cavity (12); A hollow chamber (15), wherein the hollow chamber (15) is opened inside the sealing cover (2), one end of the air guide tube (14) away from the hard plate (13) is connected to the hollow chamber (15), and the interior of the hollow chamber (15) and the interior of the air guide tube (14) are in communication with each other; An air pressure sensor (16), the air pressure sensor (16) being installed inside the cavity (15); a processing unit, the processing unit being mounted outside the housing cover (1), the processing unit being electrically connected to the air pressure sensor (16); An extrusion assembly, the extrusion assembly being arranged below the annular airbag (4), the extrusion assembly being used to extrude the annular airbag (4); The extrusion assembly includes: An electromagnet (6), the electromagnet (6) being arranged below the annular airbag (4), the electromagnet (6) being electrically connected to the processing unit; A permanent magnet (7), wherein the permanent magnet (7) is arranged above the electromagnet (6) and has a ring-shaped structure. When the electromagnet (6) is energized, it generates an upward magnetic repulsive force on the permanent magnet (7); A fixing component is arranged beside the annular airbag (4), and is used to stabilize the annular airbag (4) after being squeezed.

2. The electric actuator mechanism that is not prone to oil leakage according to claim 1, characterized in that: The fixed components include: A sleeve (8), wherein the sleeve (8) is fixedly mounted on the left and right ends of the permanent magnet (7); An elastic component (9), wherein the elastic component (9) is installed inside the sleeve (8); A bevel tooth (10), wherein the bevel tooth (10) is sleeved in the sleeve (8), and one end of the bevel tooth (10) located in the sleeve (8) is fixedly connected to the elastic component (9), and the bevel surface of the bevel tooth (10) is arranged to face upward; Inclined tooth grooves (11), wherein the inclined tooth grooves (11) are provided at left and right ends of the inner wall of the recessed portion of the sealing cover (2).

3. The electric actuator mechanism that is not prone to oil leakage according to claim 2, characterized in that: A pressure threshold value in the cavity (12) is preset. If the pressure in the cavity (12) is lower than the preset threshold value, the processing unit controls the electromagnet (6) to be energized and pushes the permanent magnet (7) to squeeze the annular airbag (4). If the pressure in the cavity (12) reaches the preset threshold value, the processing unit controls the electromagnet (6) to be de-energized.

4. The electric actuator mechanism that is not prone to oil leakage according to claim 1, characterized in that: The processing unit records in real time the time point at which the air pressure in the cavity (12) is lower than a preset air pressure threshold value and uses the time point as historical data, predicts the next time point at which the air pressure in the cavity (12) is lower than the preset threshold value through the historical data, and at the previous moment when the air pressure in the cavity (12) is lower than the preset threshold value, the processing unit controls the electromagnet (6) to be energized.

5. The electric actuator mechanism that is not prone to oil leakage according to claim 4, characterized in that: include: Conductive rubber (17), the conductive rubber (17) is embedded in the rubber ring (5), and in an initial state, one side end of the conductive rubber (17) contacts the outer side surface of the output shaft (3), and the upper and lower ends of the conductive rubber (17) are electrically connected to the processing unit.

6. The electric actuator mechanism that is not prone to oil leakage according to claim 1, characterized in that: include: A wireless sending module and a wireless receiving module, wherein the wireless sending module and the wireless receiving module are both installed outside the housing cover (1), and the wireless sending module and the wireless receiving module are electrically connected to the processing unit.

7. The electric actuator mechanism that is not prone to oil leakage according to claim 1, characterized in that: include: A sealing ring (18) is arranged between the housing cover (1) and the sealing cover (2).

8. The electric actuator mechanism that is not prone to oil leakage according to claim 3, characterized in that: The elastic component (9) is a spring or a spring.

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