Electro-hydraulic servo valve armature assembly combination process method and clamp

Abstract

The invention belongs to the technical field of machinery, and discloses an electro-hydraulic servo valve armature assembly combination process method, a clamp and a combined clamp, the combined clamp comprises a first clamp and a second clamp, the first clamp assembles an armature piece and a feedback rod to obtain an armature assembly, the second clamp assembles the armature assembly and a bourdon tube, and assembly of parts is completed. According to the technological method, a new combination sequence is adopted, the manual pre-combination process is avoided, the situation that a feedback rod cannot be vertically pressed in is avoided, the coaxiality after outer circle pressing is guaranteed, the risk that in the pressing-in process, the deformation amount of parts is small, deformation stress is reduced, and the whole is scrapped is caused is lowered, and the manufacturing cost is saved; and the other part is a pressing bourdon tube combined clamp, so that the thin-wall part of the bourdon tube is prevented from being damaged, and the performance stability of the servo valve is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of machinery, and relates to a machining method of an armature assembly of an electro-hydraulic servo valve, in particular to a combined process method and clamp of the armature assembly of the electro-hydraulic servo valve. BACKGROUND

[0002] The armature assembly is a core component in the jet deflection plate valve, and the combined machining quality of the armature assembly affects the quality and the one-time assembly and adjustment qualification rate of the electro-hydraulic servo valve, and determines the product performance of the electro-hydraulic servo valve. The traditional combined method of the armature assembly is that the armature and the baffle are combined and welded into an armature-baffle assembly, then the feedback rod is manually put into the hole of the armature-baffle assembly, and the feedback rod is pressed into the hole from above by using a pressure head, and finally the spring tube is machined and sealed. The combined method cannot meet the pressing requirements of the new armature assembly, and the feedback rod cannot be vertically pressed into the hole after being manually pressed, which affects the position degree of the feedback rod ball, and also causes stress in the pressing process, thereby causing the zero position of the servo valve to be out of tolerance in a high temperature state. The present application relates to a combined process method of the armature assembly of the jet deflection plate valve, the outer diameter size of the feedback rod is strictly controlled by the process, and the positioning hole of the clamp is used to ensure the coaxiality in the outer diameter pressing, so that the deformation amount of the part is small in the pressing process, the deformation stress is reduced, the performance of the servo valve is more stable in a high temperature state, and the one-time assembly and adjustment qualification rate of the servo valve is steadily improved. Meanwhile, the method can be popularized to the design scheme and machining method of all armature assemblies, such as shown in the drawings. Figure 1 SUMMARY

[0003] In order to solve the above problems, the present application provides a combined process method and clamp of the armature assembly of the electro-hydraulic servo valve.

[0004] The technical scheme of the present application is as follows: A combined clamp of the armature assembly of the electro-hydraulic servo valve, comprising a first clamp, the first clamp comprising a support guide block, a feedback rod positioning block and a feedback rod support block, the feedback rod support block being a cylindrical structure, a through hole for clamping the feedback rod being arranged in the middle of the feedback rod support block, a circular groove being arranged on the top of the feedback rod support block with the axis of the through hole as the center, the feedback rod positioning block being a cylindrical structure matched with the inner shape of the circular groove, and the center of the feedback rod positioning block also having an inner hole matched with the radial outer shape of the feedback rod; the support guide block being provided with an axial hole penetrating up and down in the center, the axial hole of the support guide block being matched with the radial outer shape of the armature part, the bottom of the support guide block being provided with a notch matched with the shape of the top of the feedback rod positioning block, and the top of the support guide block being provided with a support structure matched with the armature part of the armature.

[0005] Further, the feedback support block is clamped below the boss part of the feedback rod, and the top of the feedback rod support block is supported below the boss part of the feedback rod. ​

[0006] Further, the inner hole of the feedback positioning block matches the boss part of the feedback rod, and the feedback rod positioning block is clamped on the boss part of the feedback rod.

[0007] Further, the height dimensions of the support guide block, the feedback positioning block and the feedback support block are such that, after the armature piece and the feedback rod are connected, the top inner side of the armature part of the armature piece and the bottom dimension of the boss part of the feedback rod meet the design requirements.

[0008] An electro-hydraulic servo valve armature assembly combination process method uses the aforementioned electro-hydraulic servo valve armature assembly combination clamp to assemble the armature piece and the feedback rod, including the following steps: S1, fixing the feedback rod in the through hole of the feedback support rod; S2, loading the feedback positioning block from above into the circular groove of the feedback support rod, while the feedback rod is loaded in the inner hole of the feedback positioning block; S3, loading the bottom of the support guide block above the feedback positioning block; S4, inserting the armature piece into the axial hole from above the support guide block until the inner side of the armature part of the armature piece contacts the support structure on the top of the support guide block; S5, sequentially removing the feedback support block, the feedback rod positioning block and the support guide block to obtain the armature assembly.

[0009] An electro-hydraulic servo valve armature assembly combination clamp, including a second clamp, the second clamp including a slide rail, a support and a second taper pin, the slide rail being provided with a platform for fixing a spring tube, the support being a left-right two-piece structure, the bottom of the support being provided with a sliding block structure matched with the slide rail and being able to translate left and right on the slide rail, the center of the support being provided with a structure hole matched with an armature assembly and penetrating up and down, the armature assembly being able to be inserted into the structure hole from above the support, the platform of the slide rail fixing the spring seat being located directly below the structure hole; the left and right two pieces of the support being fixedly connected by the second taper pin.

[0010] Further, it further includes spring tube positioning pins, two spring tube positioning pins being inserted through the slide rail and the spring tube from top to bottom, thereby fixing the horizontal position of the spring seat and the slide rail.

[0011] Further, the structure hole includes three sections from top to bottom: the first section is a horizontal groove section, the horizontal groove section matching the armature part of the armature assembly; the second section is a protruding block section, the protruding block section being the same as the horizontal groove section except the center, the center of the protruding block section being provided with a support ring matched with the top inner side surface of the armature part of the armature assembly; the third section is a circular hole section, the circular hole section matching the radial outer circle of the armature piece of the armature assembly.

[0012] An electro-hydraulic servo valve armature assembly combination process method uses the aforementioned electro-hydraulic servo valve armature assembly combination clamp to assemble the armature assembly combined with the feedback rod and the spring tube, and comprises the following steps: S1, the left and right two petals of the support are separated, and are respectively slid to the two ends of the slide rail, exposing the platform on the slide rail; S2, the spring tube is fixed horizontally on the platform of the slide rail; S3, the left and right two petals of the support are gradually closed, and the lower half of the armature assembly is placed in the structure hole of the support; S4, after the left and right two petals of the support are completely closed, the armature assembly is pressed down, so that the armature assembly is completely pressed into the structure hole of the support; S5, the support is separated again, and the assembled spring tube armature assembly is taken out.

[0013] The beneficial effects of the present application are as follows: 1, the electro-hydraulic servo valve armature assembly combination process method of the present application, wherein there are two parts: one part is that the process method adopts a new combination sequence, i.e. the armature and the support tube are welded and combined into an armature tube assembly → the feedback rod is combined → the flat surface and the jet slot on the feedback rod are processed → the spring tube is pressed → the spring tube sealing test, the process method designs a feedback rod-armature tube assembly combination clamp, avoids the manual pre-combination process, ensures the coaxiality after the outer circle is pressed, reduces the deformation amount and deformation stress of the parts during the pressing process, reduces the risk of overall scrap, and saves the manufacturing cost; another part is that a pressing spring tube combination clamp is designed, which avoids damaging the thin wall part of the spring tube, improves the performance stability of the servo valve, and.

[0014] 2, when the outer circle of the support tube and the feedback rod is processed, the outer circle precision is improved, so that the combination size can be ensured by the clamp positioning during the combination process.

[0015] 3, the inner hole of the support tube guide block in the feedback rod-armature tube assembly combination clamp and the inner hole of the feedback rod positioning block have high coaxiality requirements, which ensure the relative position of the two parts during the combination process, and at the same time, the feedback rod is not deformed and bent.

[0016] 4, the feedback rod support block in the feedback rod combination clamp adopts a two-petal structure, and the coaxiality requirement is ensured by embedding the feedback rod positioning block in the combination.

[0017] 5, the spring tube support in the spring tube combination clamp adopts a two-petal structure, which ensures that the thin wall of the spring tube is not contacted during the combination process.

[0018] 6, the spring tube support in the spring tube combination clamp is calculated by size chain, so that the small end of the spring tube is only supported by an R angle, and the thin wall of the spring tube is not stressed during the entire pressing process.

[0019] 7. The support part of the support of the spring tube assembly clamp is rounded and polished, ensuring that the R angle of the small end of the spring tube is uniformly stressed during the assembly process. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 It is a combination sequence diagram of the electro-hydraulic servo valve armature assembly combination process method of the present application.

[0022] Figure 2 It is a feedback rod and armature assembly combination clamp schematic diagram of the electro-hydraulic servo valve armature assembly combination process method of the present application.

[0023] Figure 3 It is a spring tube pressing clamp schematic diagram of the electro-hydraulic servo valve armature assembly combination process method of the present application.

[0024] Among them, 1 is a support guide block, 2 is a feedback rod positioning block, 3 is a feedback rod support block, 4 is a first taper pin, 5 is a sliding rail, 6 is a support, 7 is a spring tube positioning pin, 8 is a second taper pin, 9 is a nut; A is an armature assembly, B is a feedback rod, C is a spring tube. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0026] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely illustrative of the present application and is not intended to limit the present application, as is apparent to one of ordinary skill in the art. In the following detailed description of the embodiments, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the application can be practiced. The present application is not limited to the specific embodiments described in the following detailed description.

[0027] In the description of the present application, it should be noted that the directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the directions or positional relationships described in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as limiting the present application. In addition, the ordinal numbers (for example, "first" and "second") are used to distinguish objects, and are not limited to the order, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, "mounting", "connection" and "connection" should be understood in a broad sense, which can be direct connection or indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0029] It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict, and each embodiment can be mutually referenced and quoted. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] Embodiment 1: An electro-hydraulic servo valve armature assembly combination clamp comprises a first clamp, the first clamp comprising a support guide block 1, a feedback rod positioning block 2 and a feedback rod support block 3, the feedback rod support block 3 being a cylindrical structure, the feedback rod support block 3 being provided with a through hole for clamping a feedback rod B in the middle, the top of the feedback rod support block 3 being provided with a circular groove with the axis of the through hole as the center, the feedback rod positioning block 2 being a cylindrical structure matched with the inner shape of the circular groove, the center of the feedback rod positioning block 2 also having an inner hole matched with the radial outer shape of the feedback rod B; the support guide block 1 is provided with an axial hole penetrating up and down in the center, the axial hole of the support guide block 1 being matched with the radial outer shape of an armature piece A, the bottom of the support guide block 1 being provided with a notch matched with the shape of the top of the feedback rod positioning block 2, and the top of the support guide block 1 being provided with a support structure matched with the armature part of the armature piece A.

[0031] The feedback support block 3 is clamped below the boss portion of the feedback rod B, and the top of the feedback rod support block 3 is supported below the boss portion of the feedback rod B.

[0032] The inner hole of the feedback positioning block 2 matches the boss part of the feedback rod B, and the feedback rod positioning block 2 is clamped in the boss part of the feedback rod B.

[0033] The height dimensions of the support guide block 1, feedback positioning block 2, and feedback support block 3 ensure that, after the armature A and feedback rod B are connected, the top inner side of the armature part of the armature A and the bottom dimension of the boss part of the feedback rod B meet the design requirements.

[0034] A process for assembling an armature assembly of an electro-hydraulic servo valve, using the aforementioned electro-hydraulic servo valve armature assembly fixture, assembles the armature A and the feedback rod B, including the following steps: S1, fix the feedback rod B in the through hole of the feedback support rod 3; S2, insert the feedback positioning block 2 into the circular groove of the feedback support rod 3 from above, while the feedback rod B is installed in the inner hole of the feedback positioning block 2; S3, then place the bottom of the support guide block 1 on top of the feedback positioning block 2; S4, insert armature A into the axial hole from above the support guide block 1 until the inner side of the armature part of armature A contacts the support structure at the top of the support guide block 1. S5, dismantle the feedback support block 3, feedback rod positioning block 2 and support guide block 1 in sequence to obtain the armature assembly.

[0035] An electro-hydraulic servo valve armature assembly fixture includes a second fixture, which comprises a slide rail 5, a support 6, and a second tapered pin 8. The slide rail 5 has a platform for fixing a spring tube C. The support 6 has a two-part structure, and the bottom of the support 6 has a slider structure that matches the slide rail 5 and can move left and right on the slide rail 5. The center of the support 6 has a through-hole structure for matching the armature assembly, and the armature assembly can be inserted into the structure hole from the upper part of the support 6. The platform of the slide rail 5 that fixes the spring seat C is located directly below the structure hole. The two parts of the support 6 are fixedly connected by the second tapered pin 8.

[0036] It also includes Bourdon tube positioning pins 7, with two Bourdon tube positioning pins 7 inserted from top to bottom through the slide rail 5 and the Bourdon tube C, thereby fixing the horizontal position of the spring seat C and the slide rail 5.

[0037] The structural hole consists of three sections from top to bottom: the first section is a transverse groove section, which matches the armature part of the armature assembly; the second section is a protrusion section, which is the same as the transverse groove section outside the center, and the center of the protrusion section is provided with a support ring that matches the shape of the top inner side of the armature part of the armature assembly; the third section is a circular hole section, which matches the radial outer circle of the armature A of the armature assembly.

[0038] A process for assembling an armature assembly of an electro-hydraulic servo valve, using the aforementioned electro-hydraulic servo valve armature assembly fixture, assembles the armature assembly with feedback rod B and spring tube C, including the following steps: S1, separate the left and right halves of the support 6 and slide them to the two ends of the slide rail 5 respectively, exposing the platform on the slide rail 5; S2, fix the spring tube C horizontally on the platform of the slide rail 5; S3, gradually bring the left and right halves of the support 6 together, and at the same time place the lower half of the armature assembly into the structural hole of the support 6. S4. After the left and right halves of the support 6 are completely closed, press down the armature assembly so that the armature assembly is completely pressed into the structural hole of the support 6. S5, re-split the support 6 and remove the assembled armature assembly of the spring tube C.

[0039] Example 2: A method for assembling an armature assembly of an electro-hydraulic servo valve, the assembly process comprising the following steps: 1. The support tube and armature are welded together to form an armature assembly; 2. The feedback rod and the armature assembly are combined to form an armature assembly; 3. Machining the flat surface and jet groove on the feedback rod; 4. Press in the Bourdon tube; 5. Conduct a spring tube sealing test.

[0040] The armature and the support tube were welded together first, which served as the angular positioning reference for subsequent assembly. Prepare a precision-machined feedback rod by externally grinding the outer diameter of the stepped shaft of the feedback rod to ensure a coaxiality of 0.01 mm and a surface roughness of Ra 0.4 μm. Also, drill and ream the blind hole of the armature assembly to a certain size to fit with the outer diameter of the feedback rod and satisfy a certain interference fit.

[0041] A fixture for combining the feedback rod and the armature assembly was designed to ensure the relative position of the two parts during the assembly process.

[0042] The feedback rod and mandrel assembly assembly fixture includes: a support tube guide block 1, a feedback rod positioning block 2, and a feedback rod support block 3. The feedback rod positioning block 2 is installed between the feedback rod support block 3 and the support tube guide block 1. The feedback rod support block 3 and the feedback rod positioning block 2 support and fix the feedback rod B in a vertical direction. The support tube guide block 1 ensures that the mandrel assembly A always moves vertically after being subjected to a downward force, realizing the assembly process of pressing the blind hole of the mandrel assembly A into the feedback rod B from the lower end, thus improving the fitting accuracy and pass rate of the two components.

[0043] This invention designs a combined clamp for pressing spring tubes, which ensures that only the small end R angle is subjected to force during the pressing process, while the thin wall of the spring tube does not come into contact with the force and is not subjected to force, and also ensures the dimensional and positional accuracy of the armature assembly.

[0044] This invention designs a combined clamp for pressing spring tubes, which ensures that the thin wall of the spring tube is not stressed during the pressing process and guarantees the pressing dimensions and accuracy. The spring tube pressing fixture includes: a spring tube support 6, a spring tube positioning pin 7, a slide rail 5, a tapered pin 8, a nut 9, a spring tube C, and a tube armature assembly A. Its key feature is that the tube armature assembly A and the spring tube positioning pin 7 are installed in the slide rail 5. The spring tube positioning pin 7 serves as an armature to obtain an angular positioning reference. The spring tube support 6 supports one side of the small end of the spring tube C and connects the spring tube support 6 with the tapered pin 7. The spring tube C is connected to the slide rail 5 through the spring tube positioning pin 7, serving a positioning function while ensuring that the large end face of the spring tube C does not contact the upper surface of the slide rail 5. This fixture avoids stress on the thin wall of the spring tube C during the pressing process, and simultaneously achieves precise reference conversion through the armature and the spring tube positioning pin 7.

[0045] This armature assembly assembly process provides a new assembly sequence and processing method for armature assemblies in electro-hydraulic servo valves. By tightening the precision of the outer diameter of the feedback rod and the inner hole of the fixture, and by positioning the parts and fixture, the design drawing requirements are met, eliminating the need for manual pre-assembly. Furthermore, this method is the first to employ a blind-hole support tube pressed into the feedback rod from the bottom, and a dedicated fixture has been designed to improve the fit accuracy and yield rate. This method can be extended to the design and processing of all other armature assemblies.

[0046] Example 3: This invention application provides a process method for assembling an armature assembly of an electro-hydraulic servo valve, such as... Figure 1 The diagram mainly shows the assembly process of the feedback rod-handle assembly, the spring tube pressing process, and the spring tube sealing test. The specific assembly sequence is as follows: Assembly of feedback rod and armature assembly → Machining of flat surface and jet groove on feedback rod → Pressing in spring tube → Spring tube sealing test.

[0047] Figure 2It is a feedback rod-handle assembly fixture, including: feedback rod support block 3, feedback rod positioning block 2, support tube guide block 1, tapered pin 4, feedback rod B and handle assembly A. First, the feedback rod support block 3 supports the feedback rod B and positions it with tapered pin 4. Then, the feedback rod positioning block 2 is used to fasten the feedback rod support block 3 and fix the feedback rod B. Then, the support tube guide block 1 is assembled with the feedback rod positioning block 2. Finally, the handle assembly A is inserted into the support tube guide block 1 and a downward force is applied to press the handle assembly A and the feedback rod B together.

[0048] Figure 3 It is a Bourdon tube pressing fixture, including: Bourdon tube support 6, Bourdon tube positioning pin 7, slide rail 5, tapered pin 8, nut 9, Bourdon tube C, and armature assembly A. The armature assembly A and Bourdon tube positioning pin 7 are installed in the slide rail 5. The Bourdon tube positioning pin 7 serves as an armature to obtain an angular positioning reference. The small end of the Bourdon tube C is supported by the Bourdon tube support 6 and connected to the Bourdon tube support 6 by the tapered pin 7. The Bourdon tube C is connected to the slide rail 5 through the Bourdon tube positioning pin 7, which plays a positioning role and ensures that the large end face of the Bourdon tube C does not contact the upper surface of the slide rail 5. Finally, a downward force is applied to the armature assembly A to complete the pressing of the Bourdon tube.

[0049] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A jig for assembling an armature assembly of an electro-hydraulic servo valve, characterized in that, The first fixture includes a support guide block (1), a feedback rod positioning block (2), and a feedback rod support block (3). The feedback rod support block (3) is a cylindrical structure. The feedback rod support block (3) has a through hole in the middle for clamping the feedback rod (B). The top of the feedback support block (3) has a circular groove centered on the axis of the through hole. The feedback rod positioning block (2) is a cylindrical structure that matches the inner shape of the circular groove. The center of the feedback rod positioning block (2) also has an inner hole that matches the radial shape of the feedback rod (B). The center of the support guide block (1) has an axial hole that runs vertically through it. The axial hole of the support guide block (1) matches the radial shape of the armature (A). The bottom of the support guide block (1) has a slot that matches the top shape of the feedback rod positioning block (2). The top of the support guide block (1) has a support structure that matches the armature part of the armature (A).

2. The electro-hydraulic servo valve armature assembly fixture according to claim 1, characterized in that, The feedback support block (3) is clamped below the boss portion of the feedback rod (B), and the top of the feedback rod support block (3) is supported below the boss portion of the feedback rod (B).

3. The electro-hydraulic servo valve armature assembly fixture according to claim 2, characterized in that, The inner hole of the feedback positioning block (2) matches the boss part of the feedback rod (B), and the feedback rod positioning block (2) is clamped in the boss part of the feedback rod (B).

4. The electro-hydraulic servo valve armature assembly fixture according to claim 3, characterized in that, The height dimensions of the support guide block (1), feedback positioning block (2) and feedback support block (3) ensure that after the armature part (A) and feedback rod (B) are connected, the top inner side of the armature part of the armature part (A) and the bottom dimension of the boss part of the feedback rod (B) meet the design requirements.

5. A method for assembling an armature assembly of an electro-hydraulic servo valve, using an electro-hydraulic servo valve armature assembly assembly fixture as described in claim 4, for assembling the armature (A) and the feedback rod (B), comprising the following steps: S1, fix the feedback rod (B) in the through hole of the feedback support rod (3); S2, insert the feedback positioning block (2) into the circular groove of the feedback support rod (3) from above, while the feedback rod (B) is installed in the inner hole of the feedback positioning block (2); S3, then place the bottom of the support guide block (1) on top of the feedback positioning block (2); S4, insert the armature (A) into the axial hole from above the support guide block (1) until the inner side of the armature part of the armature (A) contacts the support structure at the top of the support guide block (1); S5, dismantle the feedback support block (3), feedback rod positioning block (2) and support guide block (1) in sequence to obtain the armature assembly.

6. A jig for assembling an armature assembly of an electro-hydraulic servo valve, characterized in that, The second clamp includes a slide rail (5), a support (6), and a second taper pin (8). The slide rail (5) has a platform for fixing the spring tube (C). The support (6) has a two-part structure. The bottom of the support (6) has a slider structure that matches the slide rail (5) and can move left and right on the slide rail (5). The center of the support (6) has a through-hole structure for matching the armature assembly. The armature assembly can be inserted into the structure hole from the upper part of the support (6). The platform of the slide rail (5) that fixes the spring seat (C) is located directly below the structure hole. The two parts of the support (6) are fixedly connected by the second taper pin (8).

7. The electro-hydraulic servo valve armature assembly fixture according to claim 6, characterized in that, It also includes a spring tube locating pin (7), with two spring tube locating pins (7) inserted from top to bottom through the slide rail (5) and the spring tube (C), thereby fixing the horizontal position of the spring seat (C) and the slide rail (5).

8. A jig for assembling an armature assembly of an electro-hydraulic servo valve according to claim 7, characterized in that, The structural hole consists of three sections from top to bottom: the first section is a transverse groove section, which matches the armature part of the armature assembly; the second section is a protrusion section, which is the same as the transverse groove section outside the center, and the center of the protrusion section is provided with a support ring that matches the shape of the top inner side of the armature part of the armature assembly; the third section is a circular hole section, which matches the radial outer circle of the armature part (A) of the armature assembly.

9. A method for assembling an armature assembly of an electro-hydraulic servo valve, using the electro-hydraulic servo valve armature assembly assembly fixture as described in claim 8, characterized in that, Assemble the armature assembly, which includes the feedback rod (B), and the Bourdon tube (C) by the following steps: S1, separate the left and right halves of the support (6) and slide them to the two ends of the slide rail (5) respectively, exposing the platform on the slide rail (5); S2, fix the spring tube (C) horizontally on the platform of the slide rail (5); S3, gradually bring the left and right halves of the support (6) together, and at the same time place the lower half of the armature assembly into the structural hole of the support (6); S4, after the left and right halves of the support (6) are completely closed, press down the armature assembly so that the armature assembly is completely pressed into the structural hole of the support (6); S5, re-split the support (6) and remove the armature assembly of the assembled spring tube (C).

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