A two-dimensional electro-hydraulic servo valve with an external zeroing mechanism

Abstract

This invention provides a two-dimensional electro-hydraulic servo valve with an external zeroing mechanism, comprising a spool valve assembly, a two-dimensional motor, and a displacement sensor, all coaxially arranged. The spool valve assembly includes a valve body, a valve core mounted within the valve body, and a valve sleeve disposed outside the valve core. The motor shaft of the two-dimensional motor is fixedly connected to the valve core. The key feature is that a valve core zeroing mechanism is provided on the outside of the electro-hydraulic servo valve. This mechanism includes an elastic feedback rod connected to the valve core. The first end of the elastic feedback rod is fixedly connected to a flexible component, which has a rotation center point. The elastic feedback rod and the flexible component rotate around this rotation center point. The second end of the elastic feedback rod is directly connected to the valve core. This invention enables rotary zeroing and axial zeroing reset of the two-dimensional electro-hydraulic servo valve core, with minimal wear between components and easy disassembly and replacement.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic servo valve technology, and more specifically to a two-dimensional electro-hydraulic servo valve with an external zeroing mechanism. Background Technology

[0002] Electro-hydraulic servo valves are key components in electro-hydraulic servo control. They are hydraulic control valves that receive analog electrical signals and output modulated flow and pressure accordingly. Electro-hydraulic servo valves have advantages such as fast dynamic response, high control accuracy, and long service life, and are widely used in electro-hydraulic servo control systems in aviation, aerospace, shipbuilding, metallurgy, chemical and other fields.

[0003] Currently, two-dimensional electro-hydraulic servo valves are generally driven by a motor-driven transmission mechanism, which in turn drives the valve body to move. However, the zero-adjustment and reset of current two-dimensional electro-hydraulic servo valves generally use a spring structure, which has many problems such as complex electro-mechanical conversion, contact wear, and high-pressure dynamic sealing.

[0004] Chinese invention patent application publication number CN114718933A discloses a zero-position adjustable two-dimensional motor direct-drive electro-hydraulic servo valve. The electro-hydraulic servo valve realizes non-contact rotational and axial reset of the two-dimensional valve through a magnet reset zero-adjustment mechanism. However, this method has disadvantages such as being difficult to disassemble, insufficient reset force, easy to be damaged and replaced under high pressure, and easy to demagnetize under high temperature.

[0005] Chinese utility model patent application CN209340250U discloses an external zero-adjustment structure for a servo valve. This external zero-adjustment structure is used to zero a torque motor. The zero-adjustment rod adopts a threaded connection, which is prone to loosening during long-term use, causing the zero position of the servo valve to deviate after being adjusted. In addition, the external zero-adjustment structure of the servo valve adopts a connection method of elastic rod and annular groove, which has the problems of large wear of parts and short life during long-term use. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a two-dimensional electro-hydraulic servo valve with an external zeroing mechanism. This invention enables the rotary and axial reset of the valve core of the two-dimensional electro-hydraulic servo valve, resulting in less wear between components and easy disassembly and replacement.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] A two-dimensional electro-hydraulic servo valve with an external zeroing mechanism includes a spool valve assembly, a two-dimensional motor, and a displacement sensor. The spool valve assembly, the two-dimensional motor, and the displacement sensor are coaxially arranged. The spool valve assembly includes a valve body, a valve core installed inside the valve body, and a valve sleeve disposed outside the valve core. The motor shaft of the two-dimensional motor is fixedly connected to the valve core. The valve core zeroing mechanism is characterized in that: a valve core zeroing mechanism is provided on the outside of the electro-hydraulic servo valve. The valve core zeroing mechanism includes an elastic feedback rod connected to the valve core. The first end of the elastic feedback rod is fixedly connected to a flexible component. The flexible component has a rotation center point. The elastic feedback rod and the flexible component rotate around the rotation center point. The second end of the elastic feedback rod is directly connected to the valve core.

[0009] Furthermore, the flexible component is configured as a cylindrical I-beam structure, comprising an upper cylindrical part and a lower base, which are connected by a hollow connecting cylinder.

[0010] Furthermore: the valve core zeroing mechanism includes a housing, on which a rotary zeroing reset mechanism and an axial zeroing reset mechanism are provided, both of which are connected to a flexible component.

[0011] Furthermore: the rotary zeroing and reset mechanism has an axial zeroing operation component and an axial buffer component on both sides of the flexible component along the axial direction of the valve core. The axial zeroing operation component includes a first elastic element and a first connecting element. The first end of the first elastic element is connected to the first connecting element, and the second end is connected to the flexible component. A first operating cavity is provided on the housing, and the first connecting element is movably connected to the first operating cavity.

[0012] Furthermore: the axial zeroing reset mechanism has a rotary zeroing operation component and a rotary buffer component on both sides of the flexible component along the direction perpendicular to the valve core axis. The rotary zeroing operation component includes a second elastic element and a second connecting element. The first end of the second elastic element is connected to the second connecting element, and the second end is connected to the flexible component. A second operating cavity is provided on the housing, and the second connecting element is movably connected to the second operating cavity.

[0013] Furthermore: the first connector includes a first zero-adjustment connector and a first anti-loosening component, wherein the tail of the first zero-adjustment connector abuts against the head of the first anti-loosening component within the first operating cavity.

[0014] Furthermore: the second connector includes a second zeroing connector and a second anti-loosening component, wherein the tail of the second zeroing connector abuts against the head of the second anti-loosening component within the second operating cavity.

[0015] Furthermore, the elastic feedback rod is a round rod, and the cross-section of the rod gradually decreases from the first end to the second end.

[0016] Furthermore: the valve core is provided with a ball hole, and the second end of the elastic feedback rod is provided with a spherical head that matches the ball hole.

[0017] Furthermore: a sleeve is fixedly connected between the valve body and the motor housing, and a third operating chamber is provided inside the sleeve. The motor shaft of the two-dimensional motor extends into the third operating chamber and is fixedly connected to the valve core inside the third operating chamber. The ball hole and the ball head are located inside the third operating chamber.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. This invention employs an external zero-adjustment mechanism, which allows for rapid adjustment of zero offset without disassembling the valve, avoiding repeated disassembly and reassembly, improving zero offset adjustment efficiency, and facilitating replacement. This invention uses an elastic feedback rod and flexible components to construct the valve core zero-adjustment mechanism, which, through mechanical feedback, offers better disassembly performance, greater reset force, stronger pressure resistance, and higher temperature resistance.

[0020] 2. This invention integrates the rotary zero-adjustment and reset mechanism and the axial zero-adjustment and reset mechanism into the valve core zero-adjustment mechanism, which allows for convenient adjustment of the valve core's rotational and axial positions, and improves the control accuracy and stability of the electro-hydraulic servo valve. The electro-hydraulic servo valve of this invention has higher adjustment flexibility, lower zero-bias error, lower risk of loosening, and longer service life.

[0021] 3. The present invention uses a flexible component with a cylindrical I-shaped structure, which can effectively buffer the tension of the elastic feedback rod on the valve core, reduce the stress deformation of the valve core, improve the response speed and sensitivity of the electro-hydraulic servo valve, and has better buffering effect and lower stress concentration.

[0022] 4. The present invention adopts a connection method of ball hole and ball head, which can eliminate concentrated contact and adhesive wear at a point, realize line contact between valve core and elastic feedback rod, so that the electro-hydraulic servo valve of the present invention has a lower coefficient of friction, less wear and longer service life. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0024] Figure 2 This is a typical cross-sectional structural diagram of the present invention. Figure 1 ;

[0025] Figure 3 yes Figure 2 A magnified view of section C;

[0026] Figure 4 This is a typical cross-sectional structural diagram of the present invention. Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the valve core zeroing mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the housing of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the flexible component of the present invention;

[0030] Figure 8 This is a schematic diagram of the assembly of the rotary zero-adjustment and reset mechanism and the axial zero-adjustment and reset mechanism of the present invention with the flexible component;

[0031] Figure 9 This is a schematic diagram of the valve core structure of the present invention;

[0032] Figure 10 This is a cross-sectional view of the valve sleeve of the present invention.

[0033] Reference numerals: 1-Slide valve assembly; 11-Valve core; 111-Ball orifice; 112-High pressure orifice; 113-Low pressure orifice; 114-Valve sleeve spiral groove; 12-Valve sleeve; 13-Valve body; 2-Two-dimensional motor; 21-Motor shaft; 22-Motor housing; 3-Displacement sensor; 4-Valve core zeroing mechanism; 41-Elastic feedback rod; 411-Spherical head; 412-Connector; 42-Flexible component; 421-Upper cylindrical part; 422-Lower base; 423-Hollow connecting cylinder; 424-Through hole; 425-Connecting groove; 43-Axial zeroing and reset mechanism ; 431-First elastic element; 432-First connecting element; 4321-First zero-adjustment connecting element; 4322-First anti-loosening element; 435-Axial buffer component; 44-Rotary zero-adjustment reset mechanism; 441-Second elastic element; 442-Second connecting element; 4421-Second zero-adjustment connecting element; 4422-Second anti-loosening element; 445-Rotary buffer component; 45-Housing; 451-First operating chamber; 452-Second operating chamber; 46-End; 47-Step surface; 48-Sealing ring; 5-Sleeve; 51-Third operating chamber; 52-Through groove. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0036] like Figures 1 to 10 As shown, a two-dimensional electro-hydraulic servo valve with an external zeroing mechanism includes a slide valve assembly 1, a two-dimensional motor 2, and a displacement sensor 3. In this example, the two-dimensional motor 2 is a two-dimensional wet motor, which can work in oil and can enhance heat dissipation through oil circulation. This solves the problem of easy demagnetization of dry motors at high temperatures and improves the working temperature range and anti-interference capability of the electro-hydraulic servo valve. The slide valve assembly 1, the two-dimensional motor 2, and the displacement sensor 3 are coaxially arranged. The slide valve assembly 1 includes a valve body 13, a valve core 11 installed in the valve body 13, and a valve sleeve 12 disposed outside the valve core 11. The motor shaft 21 of the two-dimensional motor 2 is fixedly connected to the valve core 11. A valve core zeroing mechanism 4 is disposed on the outside of the electro-hydraulic servo valve. The valve core zeroing mechanism 4 is disposed on the upper part of the electro-hydraulic servo valve. The valve core zeroing mechanism 4 can operate the valve core 11 to rotate and axially reset. The valve core zeroing mechanism 4 includes an elastic feedback rod 41 connected to the valve core 11. The first end of the elastic feedback rod 41 is fixedly connected to a flexible component 42. The flexible component 42 has a rotation center point. The elastic feedback rod 41 and the flexible component 42 rotate around the rotation center point. The second end of the elastic feedback rod 41 is directly connected to the valve core 11.

[0037] The valve core zeroing mechanism 4 includes a housing 45, on which a rotary zeroing reset mechanism 44 and an axial zeroing reset mechanism 43 are provided. Both the rotary zeroing reset mechanism 44 and the axial zeroing reset mechanism 43 are connected to the flexible component 42. The rotary zeroing reset mechanism 44 and the axial zeroing reset mechanism 43 are arranged perpendicular to each other. The axial zeroing reset mechanism 43 is arranged along the axial direction of the valve core 11, and the rotary zeroing reset mechanism 44 is arranged perpendicular to the axial direction of the valve core 11.

[0038] The flexible component 42 is configured as a cylindrical I-beam structure, comprising an upper cylindrical portion 421 and a lower base 422. The upper cylindrical portion 421 and the lower base 422 are connected by a hollow connecting cylinder 423. The upper cylindrical portion 421, the hollow connecting cylinder 423, and the lower base 422 are integrally formed. The first end of the elastic feedback rod 41 is fixedly connected to the upper cylindrical portion 421. The hollow connecting cylinder 423 and the lower base 422 have through holes 424 through which the elastic feedback rod 41 passes.

[0039] The rotation center is located on the hollow connecting cylinder 423, specifically at the midpoint of the axis of the hollow connecting cylinder 423. The flexible component is made of beryllium bronze or steel elastic material.

[0040] Sealing rings 48 are provided between the lower base 422 and the housing 45, and between the housing 45 and the sleeve 5. The sealing rings 48 can prevent hydraulic oil in the sleeve from seeping into the valve core zeroing mechanism 4 and damaging the valve core zeroing mechanism 4.

[0041] The first end of the elastic feedback rod 41 is provided with a connector 412, and the elastic feedback rod 41 is fixedly connected to the upper cylindrical part 421 through the connector 412. The connector 412 is cylindrical and is on the same axis as the upper cylindrical part 421.

[0042] The axial zeroing and reset mechanism 43 has an axial zeroing operation component and an axial buffer component 435 on both sides of the flexible component 42 along the axial direction of the valve core 11. The axial zeroing operation component includes a first elastic element 431 and a first connecting element 432. The first end of the first elastic element 431 is connected to the first connecting element 432, and the second end is connected to the flexible component 42. A first operating cavity 451 is provided on the housing 45, and the first connecting element 432 is movably connected to the first operating cavity 451. A plurality of connecting grooves 425 are opened on the side wall of the upper cylindrical part 421, and the second end of the first elastic element 431 is correspondingly disposed in the connecting groove 425 on the side wall of the upper cylindrical part 421.

[0043] The rotary zeroing and reset mechanism 44 has a rotary zeroing operation component and a rotary buffer component 445 arranged on both sides of the flexible component 42 along the direction perpendicular to the axial direction of the valve core 11. The rotary zeroing operation component includes a second elastic element 441 and a second connecting element 442. The first end of the second elastic element 441 is connected to the second connecting element 442, and the second end is connected to the flexible component 42. A second operating cavity 452 is provided on the housing 45, and the second connecting element 442 is movably connected to the second operating cavity 452. A plurality of connecting grooves 425 are opened on the side wall of the upper cylindrical part 421, and the second end of the second elastic element 441 is correspondingly disposed in the connecting groove 425 on the side wall of the upper cylindrical part 421.

[0044] In this example, the axial buffer component 435 and the rotary buffer component 445 can be springs. The side wall of the housing 45 has slots corresponding to the axial buffer component 435 and the rotary buffer component 445, which are used to limit the movement of the axial buffer component 435 and the rotary buffer component 445. The axial buffer component 435, the rotary buffer component 445, the first elastic element 431, and the second elastic element 441 all have a certain amount of compression in their initial positions. The preload forces of the axial buffer component 435 and the first elastic element 431 on the flexible component 42 are the same in magnitude but opposite in direction, and the preload forces of the rotary buffer component 445 and the second elastic element 441 on the flexible component 42 are the same in magnitude but opposite in direction.

[0045] Both the first connector 432 and the second connector 442 have an end 46 at their front ends, and the first connector 432 and the second connector 442 are sleeved with the corresponding first elastic member 431 and the second elastic member 441 through their respective ends 46. The front ends of the first connector 432 and the second connector 442 have a stepped surface 47, and the first connector 432 and the second connector 442 abut against the corresponding first elastic member 431 and the second elastic member 441 through the stepped surface 47.

[0046] The first connector 432 includes a first zeroing connector 4321 and a first anti-loosening component 4322. The tail of the first zeroing connector 4321 abuts against the head of the first anti-loosening component 4322 within the first operating cavity 451.

[0047] The first operating cavity 451 is formed on the side wall of the housing 45. The inner wall of the first operating cavity 451 is provided with threads, and the outer surface of the first zero-adjustment connector 4321 is provided with threads. The first operating cavity 451 is threadedly connected to the first zero-adjustment connector 4321 and the first anti-loosening component 4322.

[0048] The second connector 442 includes a second zeroing connector 4421 and a second anti-loosening component 4422. The tail of the second zeroing connector 4421 and the head of the second anti-loosening component 4422 abut against each other in the second operating cavity 452.

[0049] The second operating cavity 452 is formed on the side wall of the housing 45. The inner wall of the second operating cavity 452 is provided with threads, and the outer surface of the second zero-adjustment connector 4421 is provided with threads. The second operating cavity 452 is threadedly connected to the second zero-adjustment connector 4421 and the second anti-loosening component 4422.

[0050] The valve core 11 has a ball hole 111, which can be a circular hole. The second end of the elastic feedback rod 41 is set as a spherical head 411, which matches the ball hole 111. The outer surface of the spherical head 411 is in line contact with the ball hole 111. The line contact can eliminate concentrated contact and adhesive wear at a single point. The ball hole 111 and the center of the flexible component 42 are on the same axis.

[0051] The valve body 13 is fixedly connected to the motor housing 22 by a sleeve 5. A third operating chamber 51 is provided inside the sleeve 5. The motor shaft 21 of the two-dimensional motor 2 extends into the third operating chamber 51 and is fixedly connected to the valve core 11 inside the third operating chamber 51. The ball hole 111 and the ball head 411 are located inside the third operating chamber 51.

[0052] The sleeve 5 has a through groove 52 on its wall for the elastic feedback rod 41 to pass through.

[0053] The elastic feedback rod 41 is a round rod, and the cross-section of the rod body gradually decreases from the first end to the second end. The gradually decreasing cross-section of the elastic feedback rod 41 can achieve a suitable stiffness.

[0054] Working principle:

[0055] like Figure 2 As shown, the system pressure port P, working oil ports A and B, and return oil pressure port T are shown. After the slide valve assembly 1 and the valve core zeroing mechanism 4 are assembled, the valve core 11 has a zero position offset, and the valve core zeroing mechanism 4 is used to adjust the zero position offset value of the valve core 11.

[0056] 1. When the slide valve assembly 1 is without pressure, the two-dimensional motor 2 is de-energized, and the valve opening is not closed, the valve opening is closed by adjusting the axial zeroing reset mechanism 43 (i.e., the valve core 11 is axially zeroed).

[0057] When not closed:

[0058] (1) When the left pressure port P of the slide valve assembly 1 is connected to the working oil port A, and the valve core 11 is on the right side of the working zero position, the first anti-loosening member 4322 is taken out from the first operating chamber 451, and the first zero-adjustment connecting member 4321 is rotated to move it to the outside of the housing 45. The axial buffer member 435 and the first elastic member 431 are extended, and the rod body of the elastic feedback rod 41 rotates clockwise around the rotation center (for the attached...). Figure 3 The elastic feedback rod 41 pulls the valve core 11 to the left through the ball head 411 at the bottom, ensuring that the left pressure port P is disconnected from the working oil port A, and the valve opening is in the closed state.

[0059] (2) When the right end pressure port P of the slide valve assembly 1 is connected to the working oil port B, and the valve core 11 is on the left side of the working zero position, the first anti-loosening member 4322 is taken out from the first operating chamber 451, and the first zero-adjustment connecting member 4321 is rotated to move it towards the inside of the housing 45. The axial buffer member 435 and the first elastic member 431 are compressed, and the rod body of the elastic feedback rod 41 rotates counterclockwise around the rotation center (for the attached...). Figure 3 The elastic feedback rod 41 pulls the valve core 11 to the right through the ball head 411 at the bottom, ensuring that the right pressure port P is disconnected from the working oil port B, and the valve opening is in the closed state.

[0060] 2. The high-pressure port 112 and the valve sleeve spiral groove 114 have an intersection area, and the low-pressure port 113 and the valve sleeve spiral groove 114 have an intersection area. When the slide valve assembly 1 is under pressure, the two-dimensional motor 2 is de-energized, and the intersection areas of the two high-pressure ports 112 and the low-pressure ports 113 with the valve sleeve spiral groove 114 are not the same, the two intersection areas are made the same by adjusting the rotary zero-adjustment reset mechanism 44 (i.e., the valve core 11 is rotated to zero).

[0061] (1) When the intersection area of ​​the high-pressure port 112 and the valve sleeve spiral groove 114 is greater than the intersection area of ​​the low-pressure port 113 and the valve sleeve spiral groove 114, the second anti-loosening member 4422 is removed from the second operating chamber 452, and the second zero-adjustment connector 4421 is rotated to move it to the outside of the housing 45. The rotating buffer member 445 and the second elastic member 441 are extended, and the rod body of the elastic feedback rod 41 rotates clockwise around the rotation center (for the attached...). Figure 4 The elastic feedback rod 41 moves the valve core 11 counterclockwise through the ball head 411 at the bottom, so that the high pressure hole 112 and the low pressure hole 113 have the same intersection area with the valve sleeve spiral groove 114. The pressure at the left end of the valve core 11 is half of the system pressure P, while the pressure at the right end is always P, and the valve core 11 is in equilibrium.

[0062] (2) When the intersection area of ​​the high-pressure port 112 and the valve sleeve spiral groove 114 is smaller than the intersection area of ​​the low-pressure port 113 and the valve sleeve spiral groove 114, the second anti-loosening member 4422 is removed from the second operating chamber 452, and the second zero-adjustment connector 4421 is rotated to move it towards the inside of the housing 45. The rotating buffer member 445 and the second elastic member 441 are compressed, and the rod body of the elastic feedback rod 41 rotates counterclockwise around the rotation center (for the attached...). Figure 4 The elastic feedback rod 41 rotates the valve core 11 clockwise through the ball head 411 at the bottom, so that the intersection area of ​​the high pressure hole 112 and the low pressure hole 113 with the valve sleeve spiral groove 114 is the same. The pressure at the left end of the valve core 11 is half of the system pressure P, while the pressure at the right end is always P, and the valve core 11 is in equilibrium.

[0063] After the zero-bias adjustment of the valve core is completed, when the electro-hydraulic servo valve of the present invention operates for a period of time and the motor is powered off, it can pull the valve core at the current working position back to the design position (i.e., zero position) through the elastic force of the elastic feedback rod 41.

[0064] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use a two-dimensional electro-hydraulic servo valve with an external zeroing mechanism according to this invention, and can achieve the positive effects described in this invention.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A two-dimensional electro-hydraulic servo valve with an external zeroing mechanism, comprising a slide valve assembly (1), a two-dimensional motor (2), and a displacement sensor (3), wherein the slide valve assembly (1), the two-dimensional motor (2), and the displacement sensor (3) are coaxially arranged, the slide valve assembly (1) comprises a valve body (13), a valve core (11) installed in the valve body (13), and a valve sleeve (12) disposed outside the valve core (11), wherein the motor shaft (21) of the two-dimensional motor (2) is fixedly connected to the valve core (11), characterized in that: The electro-hydraulic servo valve is provided with a valve core zeroing mechanism (4) on its outer side. The valve core zeroing mechanism (4) includes an elastic feedback rod (41) connected to the valve core (11). The first end of the elastic feedback rod (41) is fixedly connected to a flexible component (42). The flexible component (42) has a rotation center point. The elastic feedback rod (41) and the flexible component (42) rotate around the rotation center point. The second end of the elastic feedback rod (41) is directly connected to the valve core (11). The flexible component (42) is configured as a cylindrical I-shaped structure. The flexible component (42) includes an upper cylindrical part (421) and a lower base (422). The upper cylindrical part (421) and the lower base (422) are connected by a hollow connecting cylinder (423). The valve core zeroing mechanism (4) includes a housing (45), on which a rotary zeroing reset mechanism (44) and an axial zeroing reset mechanism (43) are provided. Both the axial zeroing reset mechanism (43) and the rotary zeroing reset mechanism (44) are connected to the flexible component (42). The elastic feedback rod (41) is a round rod, and the cross-section of the rod body gradually decreases from the first end to the second end; The valve core (11) has a ball hole (111) and the second end of the elastic feedback rod (41) is set as a spherical head (411), which matches the ball hole (111).

2. The two-dimensional electro-hydraulic servo valve with an external zeroing mechanism according to claim 1, characterized in that: The axial zeroing reset mechanism (43) has an axial zeroing operation component and an axial buffer component (435) on both sides of the flexible component (42) along the axial direction of the valve core (11). The axial zeroing operation component includes a first elastic element (431) and a first connecting element (432). The first end of the first elastic element (431) is connected to the first connecting element (432), and the second end is connected to the flexible component (42). The housing (45) has a first operating cavity (451), and the first connecting element (432) is movably connected to the first operating cavity (451).

3. A two-dimensional electro-hydraulic servo valve with an external zeroing mechanism according to claim 1, characterized in that: The rotary zeroing reset mechanism (44) has a rotary zeroing operation component and a rotary buffer component (445) on both sides of the flexible component (42) along the direction perpendicular to the valve core (11). The rotary zeroing operation component includes a second elastic element (441) and a second connecting element (442). The first end of the second elastic element (441) is connected to the second connecting element (442), and the second end is connected to the flexible component (42). A second operating cavity (452) is provided on the housing (45), and the second connecting element (442) is movably connected to the second operating cavity (452).

4. A two-dimensional electro-hydraulic servo valve with an external zeroing mechanism according to claim 2, characterized in that: The first connector (432) includes a first zeroing connector (4321) and a first anti-loosening component (4322). The tail of the first zeroing connector (4321) abuts against the head of the first anti-loosening component (4322) in the first operating cavity (451).

5. A two-dimensional electro-hydraulic servo valve with an external zeroing mechanism according to claim 3, characterized in that: The second connector (442) includes a second zeroing connector (4421) and a second anti-loosening component (4422), with the tail of the second zeroing connector (4421) abutting against the head of the second anti-loosening component (4422) inside the second operating cavity (452).

6. A two-dimensional electro-hydraulic servo valve with an external zeroing mechanism according to claim 1, characterized in that: The valve body (13) is fixedly connected to the motor housing by a sleeve (5), and a third operating chamber (51) is provided inside the sleeve (5). The motor shaft (21) of the two-dimensional motor (2) extends into the third operating chamber (51) and is fixedly connected to the valve core (11) inside the third operating chamber (51). The ball hole (111) and the ball head (411) are located inside the third operating chamber (51).

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