Three-redundancy LVDT consistency adjusting device

Abstract

The invention provides a three-redundancy LVDT (Linear Variable Differential Transformer) consistency adjusting device, and belongs to the technical field of airborne servo sensors. The connecting plate is used for fixing the LVDT rotor; the three springs are respectively arranged on the three LVDT rotors in a sleeving manner; a housing; a pressing plate; the three adjusting ejector rods are used for adjusting the positions of the three LVDT stators; and the three scribing turntables are fixed to the three adjusting ejector rods respectively and used for determining the adjusting distances of the three adjusting ejector rods, angle scales are engraved on the outer sides of the side plates, indicating lines are arranged on the scribing turntables, and the indicating lines are matched with the angle scales to read the rotating angles of the adjusting ejector rods. According to the adjusting device, linear displacement is converted into angular displacement, angle scribed lines and screw pitch conversion, accurate quantitative adjustment of the consistency of the three-redundancy LVDT is achieved, and the output precision of the three-redundancy LVDT is improved.

Description

Technical Field

[0001] This invention belongs to the field of airborne servo sensor technology, specifically relating to a triple-redundant LVDT consistency adjustment device. Background Technology

[0002] LVDTs are widely used position sensors in servo control systems, with applications in aerospace, nuclear power, weaponry, shipbuilding, and automation. As servo control systems increasingly demand higher fault tolerance and greater integration and lightweight design, single-redundant LVDTs are gradually becoming insufficient to meet the needs. Therefore, the demand for small-volume triple-redundant LVDTs has emerged. Redundancy consistency is a key indicator for this type of product, determining its output accuracy. Currently, most mechanisms use double-sided fixed semi-circular clamps combined with manual tapping for consistency adjustment, which occupies a large space and makes adjustment difficult due to varying tapping force. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a triple-redundant LVDT consistency adjustment device, which solves the problems of large size and difficult consistency adjustment of triple-redundant LVDTs in a simple way, thereby improving the output accuracy of triple-redundant LVDTs.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a triple-redundancy LVDT consistency adjustment device, the adjustment device comprising: The support assembly includes a base plate and side plates disposed at both ends of the base plate; The connecting plate, fixed to the inside of one end side plate, is used to fix the LVDT mover; Three springs are respectively fitted onto three LVDT movers; The casing is fixed to the base plate; The pressure plate, fixed to the housing, is used to fix the LVDT stator after consistency adjustment to the housing; Three adjusting rods are fixed to the other side plate and are used to adjust the position of the three LVDT stators; Three graduated dials are fixed to three adjusting rods, respectively, and are used to determine the adjustment distance of the three adjusting rods. The other end of the side plate has an angle dial engraved on its outer side, and an indicator line is provided on the dial. The indicator line works with the angle dial to read the rotation angle of the adjusting rod.

[0005] The triple-redundancy LVDT consistency adjustment device provided by the present invention also has the following technical feature: the base plate is provided with a positioning groove for positioning the housing.

[0006] The triple redundancy LVDT consistency adjustment device provided by the present invention also has the following technical features: the connecting plate is provided with a threaded hole connected to the LVDT mover, and the outside of the threaded hole is provided with a countersunk hole that cooperates with and limits the positioning boss of the LVDT mover.

[0007] The triple-redundant LVDT consistency adjustment device provided by the present invention also has the following technical feature: the three springs are coaxial with the three LVDT movers respectively.

[0008] The triple-redundant LVDT consistency adjustment device provided by this invention also has the following technical feature: the diameter of the spring is larger than the outer diameter of the center hole of the LVDT stator and smaller than the outer diameter of the LVDT stator. The free length L of the spring is: L = D + (L1 - L2) + L0 Where D is the distance between the opposite end faces of the housing and the connecting plate, L1 is the length of the housing, L2 is the length of the LVDT stator, and L0 is the preload length.

[0009] The triple-redundant LVDT consistency adjustment device provided by the present invention also has the following technical features: the upper and lower surfaces of the housing are provided with mounting grooves for fixing the LVDT stator, the pressure plate is placed in the mounting groove, and the upper surface of the pressure plate is not higher than the upper and lower surfaces of the housing after the pressure plate is placed in the mounting groove.

[0010] The triple redundancy LVDT consistency adjustment device provided by the present invention also has the following technical features: flanges for fixing the housing to the base plate are provided on both sides of the housing, and positioning bosses for positioning are provided at the bottom of the housing.

[0011] The triple-redundant LVDT consistency adjustment device provided by the present invention also has the following technical feature: the adjustment rod includes a threaded rod portion passing through the side plate and a single-end top plate portion contacting the end face of the LVDT stator. The radius r of the single-ended top plate is: r1 < r < d Where r1 is the radius of the center hole of the LVDT stator, and d is the distance between the bottom of the LVDT stator outlet slot and the central axis of the LVDT stator.

[0012] Beneficial effects: Compared with the prior art, the triple-redundant LVDT consistency adjustment device provided by the present invention achieves accurate quantitative adjustment of triple-redundant LVDT consistency by converting linear displacement into angular displacement, angle marking and pitch conversion, thereby improving the output accuracy of triple-redundant LVDT. By using pressure plates and staggered spatial design, the volume is reduced, and the problems of large volume and difficult consistency adjustment of triple-redundant LVDT are finally solved in a simple way, thus improving the output accuracy of triple-redundant LVDT. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the adjustment device provided in the embodiment of the present invention; Figure 2 This is an exploded view of the structure of the adjustment device provided in the embodiment of the present invention; Figure 3 This is a schematic diagram of the LVDT stator dimensions provided in an embodiment of the present invention. Among them, 1: base plate; 2: housing; 3: pressure plate; 4: LVDT stator; 5: LVDT mover; 6: spring; 7: connecting plate; 8: nut; 9: screw; 10: adjusting rod; 11: engraving turntable. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0016] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0017] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0018] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0019] like Figure 1-3 As shown, an embodiment of the present invention provides a triple-redundant LVDT consistency adjustment device, the adjustment device comprising: The support assembly includes a base plate 1 and side plates disposed at both ends of the base plate 1; The connecting plate 7 is fixed to the inside of one end side plate and is used to fix the LVDT mover 5; Three springs 6 are respectively fitted onto three LVDT movers 5; The housing 2 is fixed to the base plate 1; The pressure plate 3 is fixed on the housing 2 and is used to fix the LVDT stator 4 after consistency adjustment on the housing 2; Three adjusting rods 10 are fixed to the other side plate and are used to adjust the position of the three LVDT stators 4; Three graduated dials 11 are fixed to three adjusting rods 10, respectively, and are used to determine the adjustment distance of the three adjusting rods 10. An angle disc is engraved on the outer side of the other end plate, and an indicator line is provided on the engraved dial 11. The indicator line cooperates with the angle disc to read the rotation angle of the adjusting rod 10.

[0020] In some embodiments, the base plate 1 is provided with a positioning groove for positioning the housing 2. The positioning groove cooperates with the positioning boss of the housing 2 to accurately position the housing 2 in the XY plane. The base plate 1 is machined with threaded holes that cooperate with the mounting lugs of the housing 2 and are fastened with screws 9 to position the housing 2 in the Z-axis direction, thereby realizing the three-dimensional spatial positioning of the housing 2 on the base plate 1. The outer surface of the LVDT stator 4 contacts the housing 2 and the pressure plate 3 respectively, and the LVDT stator 4 is fixed after adjustment by screws 9.

[0021] In some embodiments, the connecting plate 7 is provided with a threaded hole for connection with the LVDT mover 5, and a countersunk hole is provided on the outside of the threaded hole to cooperate with and limit the positioning boss of the LVDT mover 5. The LVDT mover 5 is machined with external threads and connected to the threaded hole of the connecting plate 7. The columnar boss of the connecting plate 7 is machined with threads and is fixed with a nut 8 after passing through the through hole on the side of the base plate 1.

[0022] In some embodiments, the three springs 6 are coaxial with the three LVDT movers 5 respectively.

[0023] In some embodiments, the diameter of the spring 6 is larger than the outer diameter of the central hole of the LVDT stator 4 but smaller than the outer diameter of the LVDT stator 4. The free length L of the spring is: L = D + (L1 - L2) + L0 Where D is the distance between the opposite end faces of the housing and the connecting plate, L1 is the length of the housing, L2 is the length of the LVDT stator, and L0 is the preload length. L0 is set to 10mm.

[0024] In some embodiments, the upper and lower surfaces of the housing 2 are offset to provide mounting grooves for fixing the LVDT stator 4. The pressure plate 3 is placed in the mounting groove, and after the pressure plate 3 is placed in the mounting groove, the upper surface of the pressure plate 3 is not higher than the upper and lower surfaces of the housing. The offset distribution of the pressure plates 3 on the upper and lower surfaces of the housing 2 reduces the volume space.

[0025] In some embodiments, the housing 2 has flanges on both sides for fixing the housing 2 to the base plate 1, and a positioning boss at the bottom of the housing 2 for positioning. The positioning boss cooperates with the positioning groove on the base plate 1.

[0026] In some embodiments, the adjusting rod 10 includes a threaded rod portion passing through the side plate and a single-end top plate portion contacting the end face of the LVDT stator 4. The threaded rod portion connects to the central threaded hole of the engraving turntable 11 after passing through a threaded hole on the side of the base plate 1. The single-end top plate portion contacts the side of the LVDT stator 4. The rotational motion of the threaded rod is converted into the linear displacement of the single-end top plate, which ultimately manifests as the axial extension and retraction of the LVDT stator 4. The radius r of the single-ended top plate is: r1 < r < d Where r1 is the radius of the center hole of the LVDT stator, and d is the distance between the bottom of the LVDT stator outlet slot and the central axis of the LVDT stator.

[0027] In some embodiments, the angle dial is laser-etched on the side of the pressure plate 3, which, in conjunction with the indicator line on the engraving turntable 11, determines the rotation angle of the adjusting rod 10. The rotation angle value divided by 360 degrees and multiplied by the pitch of the adjusting rod 10 is the displacement of the LVDT stator 4, thereby achieving accurate quantitative adjustment of the consistency of the triple-redundant LVDT.

[0028] The operating procedure of the adjustment device provided in any of the foregoing embodiments is as follows: Screw the threaded part of the adjusting rod 10 into the threaded hole on the side of the base plate 1. The single-end top plate is located inside the base plate 1. After the threaded rod passes through the base plate 1, apply thread-locking glue and screw it into the engraving turntable 11. Insert the LVDT mover 5 into the center hole of the triple-redundant LVDT stator 4. Place the LVDT stator 4 into the mounting hole of the housing 2, visually centering it. Align the groove of the pressure plate 3 with the outer circle of the LVDT stator 4 and fix it with screws 9. The redundant screws 9 at the bottom center of the housing 2 should be tightened. The redundant screws 9 on both sides of the top of the housing 2 should only be screwed in but not tightened. Align the positioning boss of the housing 2 with the positioning groove of the base plate 1 and insert it. After the screws 9 pass through the mounting ears of the housing 2, screw them into the threaded hole of the base plate 1. Put the spring 6 on the outer surface of the LVDT mover 5. Screw the threaded end of the mover 5 into the threaded hole of the connecting plate 7. After the threaded boss of the connecting plate 7 passes through the through hole on the side of the base plate 1, it is fixed with the nut 8. Rotate the engraved dial to move the adjusting rod 10 left and right. The displacement is the rotation angle divided by 360 degrees and then multiplied by the pitch of the adjusting rod 10. During this period, due to the action of the spring 6, the position of the LVDT stator 4 will follow the adjusting rod 10. When moving, observe the redundant electrical output values ​​on both sides of the triple-redundant LVDT in real time. After the error between the redundant electrical output values ​​on both sides and the middle redundant electrical output value is within the required error, tighten the screw 9 connected to the pressure plate 3. At this time, the consistency adjustment of the triple-redundant LVDT is completed. Loosen the screw 9 connected to the housing 2 and the base plate 1, and remove the nut 8. The triple-redundant LVDT product can then be removed.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A triple-redundant LVDT consistency adjustment device, characterized in that, The regulating device includes: The support assembly includes a base plate and side plates disposed at both ends of the base plate; The connecting plate, fixed to the inside of one end side plate, is used to fix the LVDT mover; Three springs are respectively fitted onto three LVDT movers; The casing is fixed to the base plate; The pressure plate, fixed to the housing, is used to fix the LVDT stator after consistency adjustment to the housing; Three adjusting rods are fixed to the other side plate and are used to adjust the position of the three LVDT stators; Three graduated dials are fixed to three adjusting rods, respectively, and are used to determine the adjustment distance of the three adjusting rods. The other end of the side plate has an angle dial engraved on its outer side, and an indicator line is provided on the dial. The indicator line works with the angle dial to read the rotation angle of the adjusting rod.

2. The triple-redundancy LVDT consistency adjustment device according to claim 1, characterized in that, The base plate is provided with a positioning groove for positioning the housing.

3. The triple-redundancy LVDT consistency adjustment device according to claim 1, characterized in that, The connecting plate is provided with a threaded hole for connecting to the LVDT mover, and a countersunk hole is provided on the outside of the threaded hole for limiting the positioning boss of the LVDT mover.

4. The triple-redundancy LVDT consistency adjustment device according to claim 1, characterized in that, The three springs are coaxial with the three LVDT movers respectively.

5. The triple-redundancy LVDT consistency adjustment device according to claim 1, characterized in that, The diameter of the spring is larger than the outer diameter of the center hole of the LVDT stator, but smaller than the outer diameter of the LVDT stator. The free length L of the spring is: L = D + (L1 - L2) + L0 Where D is the distance between the opposite end faces of the housing and the connecting plate, L1 is the length of the housing, L2 is the length of the LVDT stator, and L0 is the preload length.

6. The triple-redundancy LVDT consistency adjustment device according to claim 1, characterized in that, The upper and lower surfaces of the housing are provided with mounting grooves for fixing the LVDT stator. The pressure plate is placed in the mounting groove, and after the pressure plate is placed in the mounting groove, the upper surface of the pressure plate is not higher than the upper and lower surfaces of the housing.

7. The triple-redundancy LVDT consistency adjustment device according to claim 6, characterized in that, The housing has flanges on both sides for fixing the housing to the base plate, and a positioning boss at the bottom of the housing for positioning.

8. The triple-redundancy LVDT consistency adjustment device according to claim 1, characterized in that, The adjusting rod includes a threaded rod portion passing through the side plate and a single-end top plate portion that contacts the end face of the LVDT stator. The radius r of the single-ended top plate is: r1＜r＜d Where r1 is the radius of the center hole of the LVDT stator, and d is the distance between the bottom of the LVDT stator outlet slot and the central axis of the LVDT stator.

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