Adjusting type electric hydraulic actuator

Abstract

The utility model discloses an adjustable electric hydraulic actuator, and relates to the field of electric hydraulic actuators. The device comprises a shell, a cylinder barrel is installed in the shell, a barrel upper cover is fixedly installed on the upper end face of the cylinder barrel, an electromagnetic driving mechanism is installed at the lower end of the cylinder barrel, the electromagnetic driving mechanism comprises an electromagnetic pump assembly and an electromagnetic one-way valve, and a protective sleeve is arranged below the electromagnetic pump assembly and the electromagnetic one-way valve; and a movable piston is mounted in the protective sleeve in a sliding manner. When the device is used, position information is fed back in real time through a displacement sensor in the device, and a real-time position feedback signal is compared with a target position of an external set signal through a comparison method; meanwhile, the actuator can be started and stopped at any position or kept at any position by adjusting the magnitude of an external given signal, and therefore adjusting type control is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric actuators, in particular to a regulating electric hydraulic actuator. Background Technique

[0002] The valve electric actuator realizes the control of the valve through electric energy, and then realizes the opening and closing effects of the valve according to different situations. Compared with the traditional manual valve, it has the characteristics of more convenient, efficient and safe, and is widely used in large industrial equipment.

[0003] The existing Chinese patent with the publication number of CN112963603B discloses an electric valve actuator, which includes a valve body. The upper left end of the valve body is penetrated and connected with an output shaft. The right end of the output shaft extends into the valve body and is fixedly connected with a limit seat. The other end of the limit seat is fixedly connected with a chute. A limit rod is slidably connected inside the chute. The right end of the limit rod is fixedly connected with a limit block. A first rotating box is rotatably connected inside the valve body.

[0004] In view of the above related technologies, it is found that at present, the regulating valve actuators are generally mainly electric and pneumatic, but both electric and pneumatic actuators have problems such as low adjustability, large dead zone and poor positioning accuracy. Content of the Utility Model

[0005] The utility model solves the problems in the related technologies. The present application provides a regulating electric hydraulic actuator.

[0006] The utility model is realized as follows:

[0007] A regulating electric hydraulic actuator includes a housing. A cylinder barrel is installed in the housing. A cylinder barrel upper cover is fixedly installed on the upper end surface of the cylinder barrel, and an electromagnetic driving mechanism is installed at the lower end of the cylinder barrel. The electromagnetic driving mechanism includes an electromagnetic pump assembly and an electromagnetic check valve. A protective sleeve is arranged below the electromagnetic pump assembly and the electromagnetic check valve. A movable piston is slidably installed in the protective sleeve. An installation plate matching with the movable piston is also installed in the cylinder barrel. A diaphragm spring check valve assembly matching with the electromagnetic pump assembly is also installed below the electromagnetic pump assembly. A piston bracket is also installed in the middle of the cylinder barrel. A control box is fixedly installed on the outer side surface of the housing. A displaceable push rod that can be slidably adjusted is installed in the control box, and a displacement sensor is fixedly installed in the control box. The dial rod of the displacement sensor is inserted into the slot of the displaceable push rod.

[0008] The diaphragm spring check valve assembly can prevent the hydraulic oil in the high-pressure area from flowing to the low-pressure area through the electromagnetic pump when the electromagnetic pump assembly stops working. The type of the displacement sensor can be various. The structure shown here is a linear sensor, such as a resistance ruler, an LVDT, etc.

[0009] Furthermore, a filter screen bracket is fixedly installed at the lower end of the electromagnetic check valve. A mating filter screen is fixedly installed in the filter screen bracket, and a filter screen sealing ring is installed between the mating filter screen and the mounting plate.

[0010] By adopting the above technical solution, the mating filter screen and the filter screen sealing ring can filter out impurities in the system and maintain the cleanliness of the hydraulic oil in the system.

[0011] Furthermore, a lower buckle plate is fixedly installed on the upper cover of the cylinder body, and an outward-turned edge that mates with the lower buckle plate is provided at the top of the cylinder barrel. A boss is integrally formed on the outer side surface of the lower buckle plate. A terminal guard and an upper buckle plate are also installed on the upper end surface of the upper cover of the cylinder body, and a detachable sealing plug is installed on the upper buckle plate.

[0012] By adopting the above technical solution, by fixedly installing the terminal guard and the upper buckle plate on the upper end surface of the upper cover of the cylinder body and installing a detachable sealing plug on the upper buckle plate, it is convenient to better open and add hydraulic oil, and it can also prevent the hydraulic oil from seeping out through the small holes.

[0013] Furthermore, a Y-shaped sealing ring is provided at the lower end of the protective sleeve.

[0014] By adopting the above technical solution, the Y-shaped sealing ring achieves good sealing between the movable piston, the protective sleeve, the mounting plate and the cylinder barrel.

[0015] Furthermore, a long strip plate is provided on the outer side surface of the piston bracket. The long strip plate is integrally formed with the piston bracket, and a groove corresponding to the long strip plate is provided on the inner side surface of the upper cover of the cylinder body.

[0016] By adopting the above technical solution, during assembly, the long strip boss is inserted into the groove, which can play a guiding role to prevent the oil cylinder from rotating when moving up and down.

[0017] Furthermore, small holes are provided on the upper cover of the cylinder body, and a plurality of wiring terminals are installed on the upper end surface of the upper cover of the cylinder body. A wire management groove is provided at the lower end of the upper cover of the cylinder body.

[0018] By adopting the above technical solution, the wires of the electromagnetic pump and the electromagnetic valve are fixed through the wire management groove and then welded to the lower part of several wiring terminals. The wiring terminals can use pluggable female connectors to introduce the wires into the circuit board in the control box. The small holes on the upper cover of the cylinder barrel are used to fill the cylinder barrel with hydraulic oil.

[0019] Furthermore, a dust-proof sleeve is provided between the cylinder barrel and the outer shell, a cylinder body sealing ring is installed between the cylinder barrel and the upper cover of the cylinder body, and a connecting platform is fixedly installed at the lower end of the cylinder barrel.

[0020] By adopting the above technical solution, the cylinder barrel assembly is installed in the housing, and a dust cover is arranged between the cylinder barrel and the housing, which can effectively prevent external dust, water, etc. from entering the interior of the housing and causing component rust and abnormal wear.

[0021] Furthermore, a pre-compression spring is installed between the lower buckle plate and the housing.

[0022] By adopting the above technical solution, by installing a pre-compression spring between the lower buckle plate and the housing, it can be quickly reset by the pre-compression spring when in use.

[0023] Furthermore, a long hole communicating with the control box is opened on the side surface of the housing, a connecting plate is fixedly installed on the convex platform, and the connecting plate is fixed to the displacement push rod by self-tapping screws.

[0024] By adopting the above technical solution, by opening a long hole on the outer side surface of the housing, it is convenient for the side surface of the housing to communicate with the control box during use, facilitating linkage during use.

[0025] Furthermore, a metal cover plate is fixedly installed on the upper end surface of the housing, a connecting screw is arranged in the middle of the metal cover plate, a system push rod is installed at the lower end of the connecting screw, and a push rod sealing ring is installed between the cylinder body upper cover and the system push rod.

[0026] By adopting the above technical solution, the stability of the installation between the cylinder body upper cover and the system push rod is ensured through the setting of the push rod sealing ring.

[0027] Compared with the prior art, the beneficial effects of the present utility model are:

[0028] In this application, by installing a high-precision displacement sensor, the real-time position signal of the actuator can be fed back to the built-in single-chip microcomputer. When the actuator works, the actuator single-chip microcomputer receives an external given signal, and the single-chip microcomputer will automatically calculate the position that the actuator should reach under this given signal, that is, the target position of the actuator. The single-chip microcomputer compares the received real-time position feedback signal with the target position corresponding to the external set signal, and adjusts the next action of the actuator according to the comparison result.

[0029] When the target position signal is greater than the real-time position signal, the system starts the electromagnetic pump to keep the electromagnetic one-way valve in the closed state, and pushes the actuator to start moving, and the displacement gradually increases. When the target position signal is equal to the real-time position signal, the system closes the electromagnetic pump and at the same time keeps the electromagnetic one-way valve in the closed state. At this time, the actuator is in the position holding state and the displacement remains unchanged. When the target position signal is less than the real-time position signal, the system closes the electromagnetic pump and at the same time keeps the electromagnetic one-way valve in the open state. At this time, the actuator starts to reset and the displacement gradually decreases.

[0030] During use, the displacement sensor in the device is used to feed back the position information in real time. By using the comparison method, the real-time position feedback signal is compared with the target position of the externally set signal. At the same time, by adjusting the magnitude of the externally given signal, the actuator can be started and stopped at any position or maintained at any position, thus realizing the regulating control. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0032] Figure 1 is a perspective view of the device of the present invention;

[0033] Figure 2 is Figure 1 a sectional view of the device shown;

[0034] Figure 3 is Figure 2 a partially enlarged view of the A position of the device shown;

[0035] Figure 4 is a perspective view of the housing of the device of the present invention shown;

[0036] Figure 5 is a bottom perspective view of the electromagnetic drive mechanism of the device of the present invention shown;

[0037] Figure 6 is a top perspective view of the electromagnetic drive mechanism of the device of the present invention shown;

[0038] Figure 7 is a perspective view of the cooperation of the upper buckle plate, terminal shield, lower buckle plate and cylinder barrel of the device of the present invention shown;

[0039] Figure 8 is a top perspective view of the upper cover of the cylinder body of the device of the present invention shown;

[0040] Figure 9 is a bottom perspective view of the upper cover of the cylinder body of the device of the present invention shown.

[0041] In the figure: 11, metal cover plate; 12, upper buckle plate; 13, terminal shield; 14, lower buckle plate; 141, boss; 15, connecting plate; 16, self-tapping screw; 17, displacement push rod; 18, lever; 19, displacement sensor; 2, housing; 20, circuit board; 204, long hole; 21, electromagnetic one-way valve; 22, movable piston; 23, protective sleeve; 24, Y-shaped sealing ring; 25, filter screen support; 26, filter screen sealing ring; 27, mating filter screen; 28, mounting plate; 29, diaphragm spring one-way valve assembly; 3, electromagnetic drive mechanism; 32, dust cover; 33, electromagnetic pump assembly; 34, pre-compression spring; 35, piston support; 351, long strip plate; 36, system push rod; 37, cylinder sealing ring; 38, push rod sealing ring; 39, cylinder upper cover; 391, small hole; 392, terminal; 393, wire groove; 394, groove; 4, control box; 40, sealing plug; 5, cylinder barrel; 501, turned-out edge; 6, connecting platform; 7, clamping block. Specific implementation mode

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model.

[0043] Embodiment 1:

[0044] Refer to Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a regulating electro-hydraulic actuator, which is essentially a regulating electro-hydraulic actuator with power-off reset function, includes a housing 2. A cylinder barrel 5 is installed in the housing 2. A cylinder barrel upper cover 39 is fixedly installed on the upper end face of the cylinder barrel 5, and an electromagnetic drive mechanism 3 is installed at the lower end of the cylinder barrel 5. The electromagnetic drive mechanism 3 includes an electromagnetic pump assembly 33 and an electromagnetic check valve 21. A protective sleeve 23 is arranged below the electromagnetic pump assembly 33 and the electromagnetic check valve 21. The electromagnetic drive mechanism 3 generally includes 1-2 electromagnetic pump assemblies 33 and 1-2 electromagnetic check valves 21. A movable piston 22 is slidably installed in the protective sleeve 23. An installation plate 28 that cooperates with the movable piston 22 is also installed in the cylinder barrel 5. A diaphragm spring check valve assembly 29 that cooperates with the electromagnetic pump assembly 33 is also installed below the electromagnetic pump assembly 33. The diaphragm spring check valve assembly 29 can prevent the hydraulic oil in the high-pressure area from flowing through the electromagnetic pump to the low-pressure area when the electromagnetic pump assembly 33 stops working. A piston support 35 is also installed in the middle of the cylinder barrel 5. A control box 4 is fixedly installed on the outer side surface of the housing 2. A circuit board 20 of the whole device is fixedly installed in the control box 4. A displaceable push rod 17 that can be slidably adjusted is installed in the control box 4, and a displacement sensor 19 is also fixedly installed in the control box 4. The dial rod 18 of the displacement sensor 19 is inserted into the slot of the displaceable push rod 17. The type of the displacement sensor 19 can be various. The structure shown here is a linear sensor, such as a resistance ruler, an LVDT, etc. However, racks 173 can also be arranged on both sides of the bottom of the displacement sensor push rod 17 to drive the rotation of gears to drive displacement sensors in the form of multi-turn potentiometers, encoders, etc.

[0045] Referring to Figure 5 and Figure 6 As shown, generally speaking, the actuator internally contains a set of electromagnetic drive mechanism 3. The electromagnetic drive mechanism 3 is composed of an electromagnetic check valve 21, a movable piston 22, a protective sleeve 23, a Y-shaped sealing ring 24, a filter screen support 25, a filter screen sealing ring 26, a matching filter screen 27, an installation plate 28, a diaphragm spring check valve assembly 29, an electromagnetic pump assembly 33, a piston support 35 and a system push rod 36. The electromagnetic drive mechanism 3 can accurately control the driving force of the electro-hydraulic actuator and can achieve good sealing. The electromagnetic drive mechanism 3 and the cylinder barrel 5, the cylinder barrel upper cover 39, the cylinder barrel sealing ring 37, the push rod sealing ring 38, the lower buckle plate 14, the terminal shield 13, and the upper buckle plate 12 and the sealing plug 40 together form the cylinder barrel assembly.

[0046] Referring to Figure 7As shown, a lower buckle plate 14 is fixedly installed on the upper cover 39 of the cylinder body, and an outward-turned edge 501 that cooperates with the lower buckle plate 14 is provided at the top of the cylinder barrel 5. A boss 141 is integrally formed on the outer side surface of the lower buckle plate 14. A terminal shield 13 and an upper buckle plate 12 are also installed on the upper end surface of the upper cover 39 of the cylinder body, and a detachable seal plug 40 is further installed on the upper buckle plate 12. A long hole 204 communicating with the control box 4 is provided on the side surface of the outer shell 2. A connecting plate 15 is fixedly installed on the boss 141, and the connecting plate 15 is fixed to the displacement push rod 17 by a self-tapping screw 16. The lower buckle plate 14 has a boss 141, and the boss 141 extends to the outside of the outer shell 2 through the long hole 204 of the outer shell 2 and is connected to the displacement sensor push rod 17 through the connecting plate 15 and the self-tapping screw 16. The displacement sensor push rod 17 is installed in the control box 4. When the actuator works, the movement of the cylinder barrel 5 will drive the displacement sensor push rod 17 to move in the control box 4, and the dial rod 18 of the displacement sensor 19 is inserted into the groove 172 of the displacement sensor push rod 17 and moves along with it; in this way, the signal of the displacement sensor 19 changes with the movement of the cylinder barrel and is fed back to the circuit board 20.

[0047] Refer to Figure 2 and Figure 3 As shown, a filter screen support 25 is fixedly installed at the lower end of the electromagnetic one-way valve 21, a matching filter screen 27 is fixedly installed in the filter screen support 25, and a filter screen sealing ring 26 is installed between the matching filter screen 27 and the mounting plate 28. The matching filter screen 27 and the filter screen sealing ring 26 can filter out impurities in the system and maintain the cleanliness of the hydraulic oil in the system. A Y-shaped sealing ring 24 is provided at the lower end of the protective sleeve 23. The protective sleeve 23 is installed between the movable piston 22 and the cylinder barrel 5 to achieve the functions of protection and guidance, and the Y-shaped sealing ring 24 realizes good sealing between the movable piston 22, the protective sleeve 23, the mounting plate 28 and the cylinder barrel 5. The cylinder barrel 5 is filled with hydraulic oil, and the cylinder barrel 5 is divided into two parts by the electromagnetic driving mechanism 3, namely the low-pressure area above and the high-pressure area below.

[0048] Refer to Figure 8 and Figure 9As shown in the figure, a long strip plate 351 is provided on the outer side surface of the piston bracket 35. The long strip plate 351 is integrally formed with the piston bracket 35. A groove 394 corresponding to the long strip plate 351 is provided on the inner side surface of the cylinder upper cover 39. A long strip-shaped boss 351 is provided on the piston bracket 35, and there is a groove 394 surrounded by two bosses on the inner side surface of the bottom of the cylinder upper cover 39. During assembly, the long strip-shaped boss 351 is inserted into the groove 394, which can play a guiding role to prevent the oil cylinder from rotating when moving up and down. A small hole 391 is provided on the cylinder upper cover 39, and a plurality of terminal blocks 392 are installed on the upper end surface of the cylinder upper cover 39. A wire groove 393 is provided at the lower end of the cylinder upper cover 39. The wires of the electromagnetic pump and the solenoid valve are fixed through the wire groove 393 and then welded to the lower part of several terminal blocks 392. The terminal blocks 392 can use pluggable female connectors to introduce the wires into the circuit board 20.

[0049] Refer to Figure 7 , Figure 8 and Figure 9 As shown in the figure, during installation, the lower buckle plate 14 abuts against the outward-turned edge 501 at the top of the cylinder barrel 5. The two ends of the upper buckle plate 12 pass through the gap of the lower buckle plate 14 and then are bent. The cylinder upper cover 39 is closely attached to the cylinder barrel 5 to form a whole. At the same time, the cylinder seal ring 37 and the push rod seal ring 38 achieve good sealing of the upper cover plate. Before installing the cylinder upper cover 39, a certain amount of hydraulic oil is injected into the cylinder barrel first, and the cylinder upper cover 39 is pressed tightly by using the upper and lower buckle plates. After that, the cylinder barrel is filled with hydraulic oil through the small hole 391 on the cylinder upper cover 39, and then a sealing plug 40 is inserted into the small hole 391 to prevent the hydraulic oil from leaking out through the small hole 391.

[0050] Refer to Figure 2 and Figure 7 As shown in the figure, a dust-proof sleeve 32 is provided between the cylinder barrel 5 and the outer shell 2, and a cylinder seal ring 37 is installed between the cylinder barrel 5 and the cylinder upper cover 39. A connecting platform 6 is fixedly installed at the lower end of the cylinder barrel 5. The cylinder barrel assembly is installed in the outer shell 2. A dust-proof sleeve 32 is provided between the cylinder barrel 5 and the outer shell 2, which can effectively prevent external dust, scale, etc. from entering the inside of the outer shell and causing component rust and abnormal wear. A pre-compression spring 34 is installed between the lower buckle plate 14 and the outer shell 2. A metal cover plate 11 is fixedly installed on the upper end surface of the outer shell 2. A connecting screw is provided in the middle of the metal cover plate 11. A system push rod 36 is installed at the lower end of the connecting screw. A push rod seal ring 38 is installed between the cylinder upper cover 39 and the system push rod 36.

[0051] Working principle: When in use, it is installed with the valve by means of the connecting platform 6 and the clamping block 9 at the equipment end, and the 24V AC power supply and the external control signal are connected. When an external control signal is given, the single-chip microcomputer compares the received real-time position feedback signal with the target position corresponding to the external set signal, and adjusts the next action of the actuator according to the comparison result.

[0052] When the target position signal is greater than the real-time position signal, the electromagnetic pump is started. At this time, under the action of the electromagnetic pump, the hydraulic oil flows into the high-pressure chamber through the electromagnetic pump and the diaphragm spring check valve. At this time, the circuit board controls the electromagnetic check valve to remain in the closed state. As the pressure in the high-pressure chamber increases and more and more hydraulic oil accumulates, the oil cylinder will be driven to compress the pre-tightening spring and gradually move downward. During the downward movement of the oil cylinder, the displacement sensor will be driven to move downward, and the real-time position signal will be fed back to the circuit board. At this time, the opening of the valve is gradually increased.

[0053] As the oil cylinder moves downward, the position feedback signal received by the circuit board gets closer and closer to the target position corresponding to the externally given signal. When the two are the same, the system stops the electromagnetic pump and continues to control the electromagnetic check valve to remain in the closed state. At this time, the diaphragm spring check valve closes. The pressure and oil volume in the high-pressure chamber are maintained in a stable state. The oil cylinder is also in a static state, and the real-time position signal is also in a static state. The actuator enters a stable state. At this time, the valve can be maintained at a stable opening.

[0054] When the target position signal is less than the real-time position signal, the system stops the electromagnetic pump and controls the electromagnetic check valve to the open state. At this time, the diaphragm spring check valve closes. The pressure in the high-pressure chamber increases, and the high-pressure oil flows through the solenoid valve to the low-pressure chamber. Under the elastic force of the pre-tightening spring, the oil cylinder is pushed to move upward gradually. During the upward movement of the oil cylinder, the displacement sensor will be driven to move upward, and the real-time position signal will be fed back to the circuit board. At this time, the opening of the valve is gradually reduced. When the opening of the valve is reduced to a certain value and the position feedback signal received by the circuit board is gradually reduced and equal to the target corresponding to the externally given signal, the actuator enters a stable state again. And the valve is maintained at a stable opening.

[0055] Since the normally open solenoid valve is adopted in this actuator, when the system is powered off, the solenoid valve is in the open state and the electromagnetic pump stops working. At this time, under the elastic force of the pre-tightening spring, the oil cylinder is pushed to move upward gradually until the initial state. And the change of the externally given signal can control and stabilize the opening of the valve at any position within the stroke.

[0056] Embodiment 2:

[0057] During the implementation process, based on the disclosed structure in Embodiment 1, by replacing the valve with a normally closed structure, a regulating electro-hydraulic actuator with a power-off holding function is formed during use.

[0058] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A regulated electro-hydraulic actuator, comprising a housing (2), characterized in that: A cylinder barrel (5) is installed in the outer shell (2). A cylinder barrel upper cover (39) is fixedly installed on the upper end face of the cylinder barrel (5), and an electromagnetic driving mechanism (3) is installed at the lower end of the cylinder barrel (5). The electromagnetic driving mechanism (3) includes an electromagnetic pump assembly (33) and an electromagnetic check valve (21). A protective sleeve (23) is arranged below the electromagnetic pump assembly (33) and the electromagnetic check valve (21). A movable piston (22) is slidably installed in the protective sleeve (23). An installation plate (28) matched with the movable piston (22) is also installed in the cylinder barrel (5). A diaphragm spring check valve assembly (29) matched with the electromagnetic pump assembly (33) is also installed below the electromagnetic pump assembly (33). A piston support (35) is installed in the middle of the cylinder barrel (5). A control box (4) is fixedly installed on the outer side surface of the outer shell (2). A displaceable push rod (17) that can be slidably adjusted is installed in the control box (4), and a displacement sensor (19) is fixedly installed in the control box (4). The dial rod (18) of the displacement sensor (19) is inserted into the slot of the displaceable push rod (17).

2. The adjustable electro-hydraulic actuator according to claim 1, characterized in that, A filter screen support (25) is fixedly installed at the lower end of the electromagnetic check valve (21). A matching filter screen (27) is fixedly installed in the filter screen support (25), and a filter screen sealing ring (26) is installed between the matching filter screen (27) and the installation plate (28).

3. The adjustable electro-hydraulic actuator according to claim 2, wherein, A lower clamping plate (14) is fixedly installed on the cylinder barrel upper cover (39), and a turned-out edge (501) matched with the lower clamping plate (14) is arranged at the top of the cylinder barrel (5). A boss (141) is integrally formed on the outer side surface of the lower clamping plate (14). A terminal shield (13) and an upper clamping plate (12) are also installed on the upper end face of the cylinder barrel upper cover (39). A detachable sealing plug (40) is also installed on the upper clamping plate (12).

4. An adjustable electro-hydraulic actuator according to claim 3, characterized in that, A Y-shaped sealing ring (24) is arranged at the lower end of the protective sleeve (23).

5. An adjustable electro-hydraulic actuator according to claim 4, wherein A long strip plate (351) is arranged on the outer side surface of the piston support (35). The long strip plate (351) is integrally formed with the piston support (35). A groove (394) corresponding to the long strip plate (351) is arranged on the inner side surface of the cylinder barrel upper cover (39).

6. The adjustable electro-hydraulic actuator according to claim 5, characterized in that, Small holes (391) are formed in the cylinder barrel upper cover (39), and a plurality of wiring terminals (392) are installed on the upper end face of the cylinder barrel upper cover (39). A wire management groove (393) is formed at the lower end of the cylinder barrel upper cover (39).

7. An adjustable electro-hydraulic actuator according to claim 6, characterized in that, A dust-proof sleeve (32) is arranged between the cylinder barrel (5) and the outer shell (2), a cylinder barrel sealing ring (37) is installed between the cylinder barrel (5) and the cylinder barrel upper cover (39), and a connecting platform (6) is fixedly installed at the lower end of the cylinder barrel (5).

8. The adjustable electro-hydraulic actuator according to claim 7, wherein A pre-compression spring (34) is installed between the lower clamping plate (14) and the outer shell (2).

9. An adjustable electro-hydraulic actuator according to claim 8, characterized in that, A long hole (204) communicating with the control box (4) is formed in the side surface of the outer shell (2). A connecting plate (15) is fixedly installed on the boss (141), and the connecting plate (15) is fixed to the displaceable push rod (17) through a self-tapping screw (16).

10. An adjustable electro-hydraulic actuator according to claim 9, wherein A metal cover plate (11) is fixedly installed on the upper end surface of the outer shell (2). A connecting screw is provided in the middle of the metal cover plate (11). A system push rod (36) is installed at the lower end of the connecting screw. A push rod sealing ring (38) is installed between the cylinder upper cover (39) and the system push rod (36).

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