Dual-redundancy actuator LVDT zeroing device and method

Abstract

The application provides a dual-redundancy actuator LVDT zero adjustment device, and belongs to the technical field of linear displacement sensor zero adjustment. The device comprises a hollow shell, an LVDT support seat fixed in the shell, two LVDTs 1 installed on the support seat, a connecting component for connecting the LVDTs 1 and a measured component, a support ring for supporting the measured component, a first cylinder head screw for fixing the connecting component and the measured component, and a second cylinder head screw for locking the LVDT 1 measuring rod and the connecting component. The connecting component is provided with an installation through hole for the first cylinder head screw to pass through and an adjusting screw hole matched with the thread of the LVDT 1 measuring rod. The application combines the thread adjusting structure with higher precision and the open thread locking structure. The principle of adjusting the LVDT linear displacement by adjusting the number of threads makes the adjusting precision high, the adjusting convenient, the signal consistency between the redundancies good, and the device safe and reliable.

Description

Technical Field

[0001] This application belongs to the field of zero-position adjustment technology of linear displacement sensors, specifically relating to a zero-position adjustment device and method for a dual-redundant actuator LVDT. Background Technology

[0002] In aircraft servo actuator systems, LVDTs (Linear Displacement Sensors) are installed to detect position feedback signals. These sensors convert the mechanical position of the servo actuator into an electrical signal and transmit it to the servo controller. The servo actuator uses the neutral position as its motion reference. This neutral reference corresponds to the electrical zero position reference of the LVDT. During assembly, the electrical zero position of each LVDT is made consistent with the mechanical zero position of the output shaft and achieves a certain level of accuracy by using the electrical zero position of the LVDT.

[0003] Existing LVDT electrical zero-point adjustment accuracy is low, making it difficult to improve signal consistency between redundancies, resulting in difficult and inefficient zero-point adjustment. To address this problem, this invention proposes a new adjustment mechanism and method. Summary of the Invention

[0004] The purpose of this application is to provide a dual-redundant actuator LVDT zero-adjustment device and method to solve the problems of low electrical zero-position adjustment accuracy and low adjustment efficiency of existing LVDTs.

[0005] To achieve the above objectives, this application provides the following technical solution: a dual-redundant actuator LVDT zeroing device, comprising a hollow housing, an LVDT support fixed in the housing, two LVDTs mounted on the support, a connecting component for connecting the LVDTs and the component under test, a support ring for supporting the component under test, a first cylindrical head screw for fixing the connecting component and the component under test, and a second cylindrical head screw for locking the LVDT measuring rod and the connecting component. The connecting component is provided with a mounting through hole for the first cylindrical head screw to pass through and an adjusting threaded hole that engages with the thread on the LVDT measuring rod.

[0006] The dual-redundant actuator LVDT zeroing device provided in this application also has the following features: the side of the adjusting threaded hole is provided with an open through groove, the upper end of the open through groove is provided with a clamping through hole and the lower end is provided with a clamping threaded hole, the clamping through hole and the clamping threaded hole are concentrically arranged, and a second cylindrical head screw passes through the clamping through hole and the clamping threaded hole, the second cylindrical head screw is used to clamp the adjusting threaded hole.

[0007] The dual-redundant actuator LVDT zeroing device provided in this application also has the following features: the housing is provided with two sets of LVDT mounting threaded holes for connecting the support base, a keyway provided between the two sets of LVDT mounting threaded holes 6a for guiding and positioning the support base, and a constraint through hole for constraining the LVDT.

[0008] The dual-redundant actuator LVDT zero-adjustment device provided in this application also has the following feature: the LVDT and the constraint through hole are in transition fit, and the fit clearance is no greater than 0.04mm.

[0009] The dual-redundant actuator LVDT zeroing device provided in this application also has the following features: the LVDT support base is an L-shaped structure, the first surface of the L-shaped structure is perpendicular to the axis of the LVDT, and the second surface is parallel to the axis. The first surface is provided with two sets of mounting holes for fixing two LVDTs respectively. The mounting holes include a central through hole for supporting and positioning the LVDT measuring rod and three countersunk holes around the central through hole. The second surface is provided with multiple through holes for passing through the first countersunk screws to adjust the axial installation position of the LVDT support base in the housing.

[0010] The dual-redundant actuator LVDT zero-adjustment device provided in this application also has the following feature: the end face of the LVDT is provided with a boss for cooperating with the central through hole and a threaded hole for cooperating with the countersunk hole.

[0011] The dual-redundant actuator LVDT zeroing device provided in this application also has the feature that a guide key that mates with a keyway is provided on the second surface.

[0012] The dual-redundant actuator LVDT zero-adjustment device provided in this application also has the feature that the support ring and the housing are integrally machined.

[0013] The dual-redundant actuator LVDT zeroing device provided in this application also has the feature that the support ring is used to radially constrain the LVDT.

[0014] Another objective of this application is to provide a method for zeroing a dual-redundant actuator LVDT, the method using the zeroing device provided in any of the foregoing claims, comprising the following steps:

[0015] S1: Install the support assembly onto the housing;

[0016] S2: Mount the component under test onto the housing.

[0017] S3: Install the connecting parts onto the component under test;

[0018] S4: Mount both LVDTs onto the connecting component;

[0019] S5: Rotate one LVDT measuring rod to make it move axially, and observe the output signal of the LVDT1 until it reaches the zero value. Rotate the other LVDT measuring rod to make it move axially, and observe the output signal of the LVDT1 until it reaches the zero value.

[0020] S6: Measure the linear travel of the component under test 7. If the linear travel of the component under test 7 meets the working stroke, proceed to S7. If the linear travel of the component under test 7 does not meet the working stroke, adjust and install the support assembly until the travel of the component under test 7 reaches the target value, and return to S5.

[0021] S7: Tighten the second cylindrical head screw 11 to secure the LVDT measuring rod. The adjustment is now complete.

[0022] Beneficial effects

[0023] The dual-redundant actuator LVDT zero-adjustment device and method provided in this application adopts a combination of thread adjustment and open thread locking structure with higher precision. The principle of adjusting the linear displacement of LVDT by adjusting the number of thread turns results in high adjustment accuracy, reaching an adjustment resolution of 1mV, convenient adjustment, good signal consistency between redundancies, achieving no signal deviation between redundancies, and safety and reliability. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the structure of the housing assembly provided in the embodiments of this application;

[0026] Figure 2 This is a schematic diagram of the lead screw assembly provided in the embodiments of this application;

[0027] Figure 3 This is an assembly diagram of the zeroing device provided in the embodiments of this application;

[0028] Figure 4 This is a partial cross-sectional view of the housing provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the connecting rod provided in an embodiment of this application;

[0030] Figure 6 for Figure 5 A cross-sectional view along the AA direction;

[0031] Figure 7 for Figure 5 Top view of the provided structure;

[0032] Figure 8 for Figure 7Cross-sectional view along the BB direction.

[0033] Among them, 1. LVDT; 2. First countersunk screw; 3. LVDT support; 4. Second countersunk screw; 5. Guide key; 6. Housing; 6a. Mounting threaded hole; 6b. Keyway; 6c. Constraint through hole; 7. Component under test; 8. Support ring; 9. Connecting component; 10. First cylindrical head screw; 11. Second cylindrical head screw; 9a. Adjusting threaded hole; 9b. Opening through slot; 9c. Mounting through hole; 9d. Clamping threaded hole; 9e. Clamping through hole. Detailed Implementation

[0034] The present application 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 application. Equivalent transformations 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 application.

[0035] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "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 drawings. They are only for the convenience of describing the creation of this application 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 limitations on the creation of this application.

[0036] 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. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] 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 can understand the specific meaning of these terms in this application based on the specific circumstances.

[0038] like Figures 1-8As shown, a dual-redundant actuator LVDT zeroing device is provided. The device includes a hollow housing 6, an LVDT support base 3 fixed in the housing 6, two LVDTs 1 mounted on the LVDT support base 3, a connecting component 9 for connecting the LVDT 1 and the measured component 7, a support ring 8 for supporting the measured component 7, a first cylindrical head screw 10 for fixing the connecting component 9 and the measured component 7, and a second cylindrical head screw 11 for locking the LVDT 1 measuring rod and the connecting component 9. The connecting component 9 is provided with a mounting through hole 9c for the first cylindrical head screw 10 to pass through and an adjusting threaded hole 9a that engages with the thread on the LVDT 1 measuring rod.

[0039] The LVDT1 has a cylindrical structure with an axially movable measuring rod at its center. The left end face of the LVDT1 has three circumferentially distributed threaded holes. The left end of the measuring rod has a threaded section. The LVDT1 passes through the mounting threaded hole 6a on the housing 6, and the LVDT1 and mounting threaded hole 6a are in a sliding fit. The connecting component 9 has a "T"-shaped structure. The component being measured 7 passes through the through hole of the housing 6 and then through the support ring 8. The connecting rod 9 is fixedly connected to the guide boss on the support ring 8 via the LVDT1. The thread of the measuring rod is inserted into the thread of the connecting rod 9. Rotating the measuring rod 10 allows it to move axially to the neutral position for zeroing. After adjustment, the measuring rod 10 is fixedly connected by the second cylindrical head screw 11.

[0040] In some embodiments, the side of the adjusting threaded hole 9a is provided with an open through groove 9b, the upper end of the open through groove 9b is provided with a clamping through hole 9e, and the lower end is provided with a clamping threaded hole 9d. The clamping through hole 9e and the clamping threaded hole 9d are concentrically arranged, and a second cylindrical head screw 11 passes between the clamping through hole 9e and the clamping threaded hole 9d. The second cylindrical head screw 11 is used to clamp the adjusting threaded hole 9a.

[0041] In some embodiments, the housing 6 is provided with two sets of LVDT mounting threaded holes 6a for connecting the LVDT support 3, a keyway 6b disposed between the two sets of LVDT mounting threaded holes 6a for guiding and positioning the LVDT support 3, and a constraint through hole 6c for constraining the LVDT1. The two LVDT1s pass through the through hole 6c and are fixedly connected to the LVDT support 3, and the through hole 6c firmly supports the LVDT1 in the radial direction.

[0042] In some embodiments, the LVDT1 and the constrained through hole 6c are in a transition fit, with a fit clearance of no more than 0.04 mm.

[0043] In some embodiments, the LVDT support 3 has an L-shaped structure. The first surface of the L-shaped structure is perpendicular to the axis of the LVDT1, and the second surface is parallel to the axis. The first surface has two sets of mounting holes for fixing the two LVDTs respectively. Each mounting hole includes a central through hole for supporting and positioning the LVDT measuring rod and three countersunk holes surrounding the central through hole. The second surface has multiple through holes for adjusting the axial installation position of the LVDT support 3 within the housing 6, through which first countersunk screws 2 pass. The first countersunk screws 2 pass through the through holes to fix the LVDT support 3 to the housing 6, and the second countersunk screws 4 pass through the mounting holes to fix the LVDT1 to the LVDT support 3. The LVDT1 measuring rod passes through the mounting holes of the LVDT support 3.

[0044] In some embodiments, the end face of the LVDT1 is provided with a boss for engaging with the central through hole and a threaded hole for engaging with the countersunk hole.

[0045] In some embodiments, the second surface is provided with a guide key 5 that cooperates with the keyway 6b.

[0046] In some embodiments, the support ring 8 and the housing 6 are integrally machined.

[0047] In some embodiments, the support ring 8 is also used to radially constrain the LVDT1.

[0048] In some embodiments, a method for zeroing a dual-redundant actuator LVDT is provided, the method using a zeroing device as provided in any of the preceding claims, comprising the following steps:

[0049] S1: Install the support assembly onto the housing 6;

[0050] S2: Mount the component under test 7 onto the housing 6

[0051] S3: Install the connecting part 9 onto the component under test 7;

[0052] S4: Mount both LVDT1s onto the connecting part 9;

[0053] S5: Rotate one LVDT measuring rod to make it move axially, and observe the output signal of the LVDT1 until it reaches the zero value. Rotate the other LVDT measuring rod to make it move axially, and observe the output signal of the LVDT1 until it reaches the zero value.

[0054] S6: Measure the linear travel of the component under test 7. If the linear travel of the component under test 7 meets the working stroke, proceed to S7. If the linear travel of the component under test 7 does not meet the working stroke, adjust and install the support assembly until the travel of the component under test 7 reaches the target value, and return to S5.

[0055] S7: Tighten the second cylindrical head screw 11 to secure the LVDT measuring rod. The adjustment is now complete.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above description is merely a preferred embodiment of this application. 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 this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A dual-redundant actuator LVDT zero-adjustment device, characterized in that, The device includes a hollow housing (6), an LVDT support base (3) fixed in the housing (6), two LVDTs (1) mounted on the LVDT support base (3), a connecting part (9) for connecting the LVDT (1) and the test component (7), a support ring (8) for supporting the test component (7), a first cylindrical head screw (10) for fixing the connecting part (9) and the test component (7), and a second cylindrical head screw (11) for locking the LVDT (1) measuring rod and the connecting part (9). The connecting component (9) is provided with a mounting through hole (9c) for the first cylindrical head screw (10) to pass through and an adjusting thread hole (9a) that engages with the thread on the LVDT (1) measuring rod. The side of the adjusting threaded hole (9a) is provided with an open through groove (9b). The upper end of the open through groove (9b) is provided with a clamping through hole (9e) and the lower end is provided with a clamping threaded hole (9d). The clamping through hole (9e) and the clamping threaded hole (9d) are concentrically arranged. A second cylindrical head screw (11) passes between the clamping through hole (9e) and the clamping threaded hole (9d). The second cylindrical head screw (11) is used to clamp the adjusting threaded hole (9a). The housing (6) is provided with two sets of LVDT mounting threaded holes (6a) for connecting the LVDT support (3), a keyway (6b) provided between the two sets of LVDT mounting threaded holes (6a) for guiding and positioning the LVDT support (3), and a constraint through hole (6c) for constraining the LVDT (1).

2. The dual-redundant actuator LVDT zero-adjustment device according to claim 1, characterized in that, The LVDT (1) and the constrained through hole (6c) are in transition fit, and the fit clearance is no more than 0.04 mm.

3. The dual-redundant actuator LVDT zero-adjustment device according to claim 1, characterized in that, The LVDT support base (3) has an L-shaped structure. The first surface of the L-shaped structure is perpendicular to the axis of the LVDT (1), and the second surface is parallel to the axis. The first surface is provided with two sets of mounting holes for fixing the two LVDTs respectively. The mounting holes include a central through hole for supporting and positioning the LVDT measuring rod and three countersunk holes around the central through hole. The second surface is provided with multiple through holes for adjusting the axial installation position of the LVDT support base (3) in the housing and for passing through the first countersunk screw (2).

4. The dual-redundant actuator LVDT zero-adjustment device according to claim 3, characterized in that, The end face of the LVDT (1) is provided with a boss for engaging with the central through hole and a threaded hole for engaging with the countersunk hole.

5. The dual-redundant actuator LVDT zero-adjustment device according to claim 3, characterized in that, The second surface is provided with a guide key (5) that cooperates with the keyway (6b).

6. The dual-redundant actuator LVDT zero-adjustment device according to claim 1, characterized in that, The support ring (8) is integrally machined with the shell (6).

7. The dual-redundant actuator LVDT zero-adjustment device according to claim 4, characterized in that, The support ring (8) is also used to radially constrain the LVDT (1).

8. A method for zeroing a dual-redundant actuator LVDT, characterized in that, The method uses the zeroing device as described in any one of claims 1-7, and includes the following steps: S1: Mount the support assembly onto the housing (6); S2: Mount the component under test (7) onto the housing (6); S3: Install the connecting parts onto the component under test (7); S4: Mount both LVDTs (1) onto the connecting part (9); S5: Rotate one LVDT measuring rod to make it move axially, and observe the output signal of the LVDT1 until it reaches the zero value. Rotate the other LVDT measuring rod to make it move axially, and observe the output signal of the LVDT1 until it reaches the zero value. S6: Measure the linear travel of the component under test (7). If the linear travel of the component under test (7) meets the working stroke, proceed to S7. If the linear travel of the component under test (7) does not meet the working stroke, adjust and install the support assembly until the travel of the component under test (7) reaches the target value, and return to S5. S7: Tighten the second cylindrical head screw (11) to secure the LVDT measuring rod. The adjustment is now complete.

Images