A universal test fixture for three-axis gyroscope

Abstract

A universal testing fixture for triaxial gyroscopes includes: a fixture body, an adapter bracket, and a clamping block. The fixture body has a hexahedral structure, with stepped holes for gyroscope mounting on three mutually perpendicular faces. An adapter bracket fixing hole, gyroscope positioning holes of different specifications, and clamping block fixing posts constitute a positioning structure. Multiple positioning structures are evenly distributed circumferentially along the stepped faces used for gyroscope mounting. The stepped holes of the fixture body are used to position gyroscopes of different specifications. The adapter bracket engages with the adapter bracket fixing holes, the gyroscope positioning holes of different specifications, and the mounting holes on the gyroscope to fix the gyroscope. Each adapter bracket corresponds to a clamping block for locking the adapter bracket. This invention provides a universal testing fixture for three commonly used gyroscopes. Using this testing fixture, three different gyroscope models can be tested using a single fixture body, eliminating the need for separate fixture design, thus saving time and costs.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber optic gyroscope testing, and in particular relates to a testing tool used in fiber optic gyroscope rate testing. Background Art

[0002] With the development of aerospace industry, the demand for inertial groups continues to increase, and the requirements for their safety performance are also constantly improving.

[0003] The fiber optic gyro assembly is a sensitive device used to sense the inertial angular velocity of the carrier, output its component in the body coordinate system, and provide continuous three-axis inertial angular velocity information for each working mode and flight phase of the carrier. The main functions of the fiber optic gyro assembly are: measuring the three-axis angular velocity information of the carrier and transmitting it to the carrier system through the interface; providing telemetry signals of important internal states of the fiber optic gyro assembly; and providing a ground test interface for use during ground testing.

[0004] Since the main sensitive devices of the fiber optic gyroscope combination are three single-axis fiber optic gyroscopes, gyroscope testing is of utmost importance. At present, when testing gyroscopes, each specification of gyroscope needs to be designed with a separate test tool. From the perspective of design, production, and use, there are many gyroscope models, and each model of gyroscope test tool is a special tool, which has a long design and processing cycle; second, the cost of using special test tool for gyroscopes of various specifications is high, because the special gyroscope test tool can only be applied to gyroscopes of this model. After the test of this model of gyroscope is completed, it cannot be applied to gyroscopes of other models and can only be placed in the tool rack, resulting in a waste of resources. Especially when the gyroscope combination is produced and the test tool has not been processed, each gyroscope test tool cannot be used universally, and cannot be interchanged or borrowed. This not only delays the production cycle and wastes time, but also wastes manpower. If the test tool can be universal among various models, it means that time, design costs, and manufacturing costs can be saved. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a test fixture for fiber optic gyroscopes in test experiments, and designs a universal gyroscope test fixture according to gyroscopes of different specifications, so that the gyroscope can be tested with guaranteed accuracy while taking into account various types of gyroscopes, thus realizing the universality of the test fixture.

[0006] The present invention is mainly realized through the following technologies: a universal test tool for a three-axis gyroscope, comprising: a tool body, an adapter bracket, and a pressure block; the tool body is a hexahedral structure, and step holes for gyroscope installation are respectively arranged on three mutually perpendicular surfaces, the adapter bracket fixing holes, gyroscope positioning holes of different specifications and the pressure block fixing columns constitute a group of positioning structures, and multiple groups of positioning structures are evenly distributed along the circumference of each step surface for gyroscope installation; the step holes of the tool body are used to position gyroscopes of different specifications, and the adapter bracket cooperates with the adapter bracket fixing holes, gyroscope positioning holes of different specifications and the mounting holes on the gyroscope to fix the gyroscope; each adapter bracket corresponds to a pressure block, which is used to lock the adapter bracket.

[0007] The adapter bracket is arc-shaped, with an arc-shaped slide groove at one end, a gyro connecting hole at the other end, and a gyro assembly hole at the middle.

[0008] The arc-shaped slide groove end of each adapter bracket is assembled with the adapter bracket fixing hole on the tooling body; when installing the gyro, each adapter bracket is rotated to the corresponding gyro positioning hole in turn, and the adapter bracket is installed in conjunction with the gyro positioning holes of different specifications through the arc-shaped slide groove or the gyro assembly hole, and then the gyro connecting holes on each adapter bracket are respectively installed corresponding to the mounting holes on the edge of the gyro.

[0009] The pressing blocks are pressed on the transfer brackets respectively, and the ends of the pressing blocks are connected with the pressing block fixing columns through waist holes.

[0010] The material of the tool body is aluminum alloy.

[0011] The method for using the universal test fixture for a three-axis gyroscope comprises the following steps:

[0012] Step 1: Select a mounting surface of the tool body, align the arc-shaped slide groove end of each adapter bracket with the adapter bracket fixing hole on the tool body, and pre-fix them with screws, flat washers, and spring washers;

[0013] Step 2: Rotate each adapter bracket to the corresponding gyro positioning hole in sequence, and then install the flat washer, spring washer and screw respectively to pre-fix the adapter bracket to the corresponding gyro positioning hole;

[0014] Step 3: Align the mounting holes on the edge of the gyro with the mounting holes on the adapter bracket, install the gyro on the adapter bracket, and fasten the gyro and the adapter bracket with screws, washers, and spring washers;

[0015] Step 4. Tighten all screws, washers, and spring washers of each adapter bracket in sequence;

[0016] Step 5: Press each pressing block onto the adapter bracket in turn, and connect the end of the pressing block to the pressing block fixing column through the waist hole;

[0017] Step 6: Repeat steps 1 to 5 to install the gyroscope on other mounting surfaces of the tooling body.

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

[0019] (1) The size of the mounting base of the gyro in the tooling body of the present invention is limited by the size of the gyro, so it is designed according to the maximum gyro diameter and compatible with gyros of three sizes. At the same time, in order to reduce the weight of the tooling body and reduce the difficulty in the handling process, the maximum external dimensions of the entire tooling body are reduced as much as possible in the design. During the design, in order to reduce the maximum external dimensions, only the safety gap between the gyros is guaranteed;

[0020] (2) As a gyro test fixture, the fixture body bears the weight of different gyros, and its accuracy is very important. In addition, the inertial system structure must have sufficient rigidity to avoid affecting the installation error of the gyro. Therefore, the fixture body is made of aluminum alloy, because its specific rigidity E / ρ (E is the elastic modulus of the material, ρ is the density of the material) is relatively high, which can basically meet the rigidity requirements.

[0021] (3) The present invention adopts an adapter bracket to realize the installation of three different types of gyroscopes. The rotation position of the adapter bracket is designed according to the position of the mounting holes of different types, so that the gyroscope mounting base can cover the largest gyroscope size. In order to realize the rapid positioning of each type of gyroscope and to facilitate the installation of the adapter bracket, threaded holes are designed at the installation position of the adapter bracket, and the installation positions of different gyroscopes are marked respectively, so that they can be easily and quickly assembled.

[0022] (5) The present invention adopts a pressing block design, and the pressing block is designed to be adjustable, so that when gyroscopes of different models are installed, the adapter bracket can be further pressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a universal testing tool in an embodiment of the present invention;

[0024] Figure 2 is a model diagram and a dimension diagram of the first gyroscope according to an embodiment of the present invention;

[0025] Figure 3 is a model diagram and a dimension diagram of a second gyroscope according to an embodiment of the present invention;

[0026] Figure 4 is a model diagram and a dimension diagram of a third gyroscope according to an embodiment of the present invention;

[0027] Figure 5 is a structural diagram of a tool body of a universal testing tool in an embodiment of the present invention;

[0028] Figure 6This is an assembly diagram of the Y-axis of the first type of gyroscope (φ108) installed on the universal test fixture in the embodiment of the present invention;

[0029] Figure 7 It is an assembly diagram of the Y-axis of the second type of gyroscope (φ98) installed on the universal test fixture in the embodiment of the present invention;

[0030] Figure 8 It is an assembly diagram of the Y-axis of the third type of gyroscope (φ78) installed on the universal test fixture in the embodiment of the present invention;

[0031] Fig. 9 It is a structural diagram of an adapter bracket of a universal testing tool in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Example

[0034] like Figures 1 to 9 In this embodiment, a universal testing tool for a three-axis gyroscope includes a tool body 1, an adapter bracket 2, and a pressing block 4.

[0035] As a carrier for carrying the three-axis gyroscope and realizing the gyroscope test performance, the fixture body 1 must provide a very accurate reference. For this reason, in the hexahedral test fixture, each surface is designed with a reference surface, and the six surfaces of the test fixture are required to have high geometric tolerances. In order to make the fixture body 1 universal and enable each type of gyroscope to be quickly positioned after installation, error prevention measures are also very important. Therefore, 5, 6, 7, and 8 marks are designed in the mounting hole of the adapter bracket 2 and the mounting surface of the adapter bracket 2 of the fixture body 1, corresponding to different types of gyroscopes. When installing the gyroscope, it is only necessary to correspond the mounting hole mark of the adapter bracket 2 to the corresponding mark in the fixture body 1. The fixture body 1 is a hexahedral structure, and step holes for gyroscope installation are respectively set on three mutually perpendicular surfaces. The adapter bracket fixing hole 5, gyroscope positioning holes of different specifications and the pressure block fixing column 10 constitute a group of positioning structures, and multiple groups of positioning structures are evenly distributed along the circumference of each step surface for gyroscope installation; the fixture body 1 is made of aluminum alloy.

[0036] The adapter bracket 2 is arc-shaped, with an arc-shaped slide groove at one end, a φ98 gyro assembly hole in the middle, and a gyro connection hole 9 at the other end, which can realize the rotation and movement of the adapter bracket 2. In order to facilitate installation, they are marked in the adapter bracket 2, 5, 6, 7, 8, and 9. The slide groove part is used to correspond to the adapter bracket fixing hole 5, φ108 gyro positioning hole 6, and φ78 gyro positioning hole 8. In addition to the slide groove, the φ98 gyro assembly hole and the gyro connection hole 9 are designed separately. In order to ensure the accuracy of gyro installation, the gyro connection hole 9 is designed into a precise boss form. Four pressure blocks 4 are pressed on the adapter bracket 2 respectively, and the ends are connected to the pressure block fixing column 10 through waist holes.

[0037] When a gyroscope needs to be tested, the adapter bracket 2 is installed in the tooling body 1 by rotating and moving the slide slot, so that three different types of gyroscopes can be installed. When the φ108 gyroscope needs to be tested, the slide slot end of the adapter bracket 2 is assembled with the adapter bracket fixing hole 5 in the tooling body 1, and flat washers, spring washers and screws are installed respectively, but they do not need to be tightened, in order to facilitate the rotation of the adapter bracket 2. Rotate the adapter bracket 2 so that the serial number marked with 6 on the rotating bracket 2 is aligned with the φ108 gyroscope positioning hole 6 on the tooling body 1, and then install flat washers, spring washers and screws respectively, and they do not need to be tightened, and assemble the slide slots of the four adapter brackets 2 with the adapter bracket fixing hole 5 and the φ108 gyroscope positioning hole 6 on the tooling body 1 respectively. Assemble the four mounting holes of the φ108 gyro with the gyro fixing holes 9 in the adapter bracket 2, install the flat washers, spring washers and screws, and when the gyro is assembled with the adapter bracket 2, tighten the screws at the adapter bracket fixing holes 5 and the φ108 gyro positioning holes 6, respectively. At this time, the φ108 gyro is assembled with the adapter bracket 2 and the tooling body 2. The installation methods of other types of gyros are the same. It should be noted that different types of gyros have different corresponding mounting holes when installed.

[0038] Among them, the tooling body 1 carries all types of gyro installations, and the strength and rigidity are guaranteed during the design. The adapter bracket 2 is an important part for realizing the assembly of different gyroscopes. Through the design of the slide groove, it meets the installation of three different types of gyroscopes; the pressure block 4 is designed as an adjustable structure to enhance the strength of the adapter bracket 2 so that it can carry gyroscopes of different weights. When installing a certain gyroscope, the adapter bracket positioning hole 5, φ108 gyroscope positioning hole 6, φ98 gyroscope positioning hole 7, and φ78 gyroscope positioning hole 8 on the tooling body 1 correspond to the slide groove and φ98 gyroscope assembly hole on the adapter bracket 2, respectively, to achieve rapid positioning of each gyroscope during installation.

[0039] In the tooling body, X, Y, and Z marks are engraved on the mounting surfaces of the gyroscopes of each axis, so that the corresponding gyroscopes have their fixed positions. At the same time, it is also easy to distinguish the gyroscopes and quickly locate them during assembly.

[0040] Taking the installation of the Y-axis gyroscope as an example, the installation steps are as follows:

[0041] Step 1: Place the gyro tooling on the operating table, prepare flat washers, spring washers, and screws, and be ready to assemble at any time.

[0042] Step 2. When the first type of gyroscope (φ108) needs to be tested, first install the slide slot end mark of the adapter bracket of the single-axis gyroscope. Do not tighten the screws, flat washers, and spring washers first to facilitate the subsequent adjustment of the orientation of the adapter bracket. Align the through holes engraved with the number 5 on the four adapter brackets with the mounting threaded holes marked with the number 5 on the surface of the gyroscope mounting base, and wait for the gyroscope to be installed. Rotate the adapter bracket 2 to align the serial number marked with 6 on the rotating bracket 2 with the φ108 gyroscope positioning hole 6 on the tooling body 1, and then install the flat washers, spring washers, and screws respectively. Tighten them again. Assemble the slide slots of the four adapter brackets 2 with the adapter bracket fixing holes 5 and φ108 gyroscope positioning holes 6 on the tooling body 1 in turn.

[0043] Step 3: After ensuring that the mounting hole of the first type of gyro (φ108) is aligned with the mounting hole 9 of the adapter bracket, install the gyro on the adapter bracket and tighten it with screws, small washers, and spring washers to complete the installation of the gyro. Tighten the adapter bracket 2 with screws, small washers, and spring washers. Tighten all the screws, small washers, and spring washers of the four adapter brackets in turn to complete the installation of the adapter bracket.

[0044] Step 4: Install the pressure block 4 and adjust it to a proper position to further fix the adapter bracket.

[0045] Step 5: Use the same method to install the X and Z axis gyroscopes, and install the φ108 three-axis gyroscope in turn.

[0046] Step 6: Ensure that the height of each axis gyroscope does not exceed the reference plane of the tooling body, and that the test cables of each axis gyroscope are connected to the overall cable through the wiring groove of the tooling body, while ensuring that the cables do not exceed the reference plane of the tooling body.

[0047] Step 7: Place the test fixture on the turntable, press it tightly, and turn on the power to perform the gyro test.

[0048] The installation steps of the second (φ98) and third (φ78) gyros are as follows: Same as the installation method of the first gyro, first rotate the adapter bracket and adjust it to the installation hole position corresponding to the slide slot, fix the adapter bracket, and respectively match the marks 7 and 8 of the adapter bracket 2 to the marks 7 and 8 of the tooling body, and install the corresponding models of gyros. Finally, adjust the pressure block to the appropriate position and tighten it with screws, thus completing the installation of the three models of gyros of each axis. After the installation of each axis gyro is completed, it can be tested.

[0049] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

[0050] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A universal test fixture for a three-axis gyroscope, characterized in that: include: Tool body (1), adapter bracket (2), pressing block (4); The tool body (1) is a hexahedral structure, and step holes for gyro installation are respectively arranged on three mutually perpendicular surfaces; the adapter bracket fixing hole (5), gyro positioning holes of different specifications and the pressure block fixing column (10) constitute a group of positioning structures, and multiple groups of positioning structures are evenly distributed along the circumference of each step surface for gyro installation; the step holes of the tool body (1) are used to position gyro of different specifications; the adapter bracket (2) cooperates with the adapter bracket fixing hole (5), gyro positioning holes of different specifications and the mounting hole on the gyro to fix the gyro; each adapter bracket (2) corresponds to a pressure block (4) for locking the adapter bracket (2); The adapter bracket (2) is arc-shaped, with an arc-shaped slide groove at one end, a gyro connection hole (9) at the other end, and a gyro assembly hole at the middle; The arc-shaped slide groove end of each adapter bracket (2) is assembled with the adapter bracket fixing hole (5) on the tooling body (1); when installing the gyro, each adapter bracket (2) is rotated to the corresponding gyro positioning hole in turn, and the adapter bracket (2) is installed in conjunction with the gyro positioning holes of different specifications through the arc-shaped slide groove or the gyro assembly hole, and then the gyro connection holes (9) on each adapter bracket (2) are respectively installed corresponding to the installation holes on the edge of the gyro; The pressing blocks (4) are respectively pressed on the adapter brackets (2), and the ends of the pressing blocks (4) are connected to the pressing block fixing columns (10) through waist holes.

2. A universal test fixture for a three-axis gyroscope according to claim 1, characterized in that: The tool body (1) is made of aluminum alloy.

3. A method for using a universal test fixture for a three-axis gyroscope as claimed in claim 1 or 2, characterized in that: The steps include: Step 1: Select a mounting surface of the tool body (1), align the arc-shaped slide groove end of each adapter bracket (2) with the adapter bracket fixing hole (5) on the tool body (1), and pre-fix them by screws, flat washers, and spring washers; Step 2: rotate each adapter bracket (2) to the corresponding gyro positioning hole in sequence, and then install the flat washer, spring washer and screw respectively to pre-fix the adapter bracket (2) and the corresponding gyro positioning hole; Step 3: Align the mounting holes on the edge of the gyro with the mounting holes of the adapter bracket, install the gyro on the adapter bracket (2), and fasten the gyro and the adapter bracket (2) with screws, washers, and spring washers; Step 4: Tighten all screws, washers, and spring washers of each adapter bracket (2) in sequence; Step 5: Press each pressing block (4) onto the adapter bracket (2) in turn, and connect the end of the pressing block (4) to the pressing block fixing column (10) through the waist hole; Step 6: Repeat steps 1 to 5 to install the gyroscope on other mounting surfaces of the tooling body (1).

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