A high-precision multi-dimensional space interface high-rigidity, low-stress connecting device

Abstract

A high-precision multi-dimensional space interface high-rigidity and low-stress connecting device, high-precision and high-rigidity optical instruments and low-precision and high-rigidity mechanical test vibration tables are connected through a mechanical test tool under the condition of a multi-dimensional space interface, and high-rigidity and low-stress installation and connection are realized, the multi-dimensional space installation interface has four interface installation points A, B, C and D interfaces, the A, B and C interfaces of the optical instrument are converted into a common installation surface or mutually parallel installation surfaces through a ball head and a cone or a ball head and a socket structure, so that the three-point positioning principle can be used to install and fix the common installation surface interface; on this basis, the optical instrument is additionally fixed and connected through the 6-degree-of-freedom adjustable D point interface. The connecting device has the advantages of simple structure, low manufacturing and processing precision requirement, high interface precision of the optical instrument itself, high structure interconnection rigidity and low installation stress.

Description

Technical Field

[0001] A high-precision, high-rigidity, low-stress connection device for a multi-dimensional spatial interface belongs to the technical fields of precision machinery and optical instruments, especially the technical field of fixed connection of high-precision optical instruments on low-precision vibration tables under large-scale mechanical environment vibration tests. Background Technology

[0002] In aerospace missions, mechanical testing is commonly used to conduct mechanical environment qualification and acceptance tests on products. For these tests, the testing fixtures require higher rigidity than the product itself. When the product is small, integral fixture design and manufacturing can be implemented, making it easier to meet the rigidity requirements. Furthermore, small products typically share a common mounting surface; this shared surface facilitates precision control during manufacturing and assembly, minimizes installation stress, and avoids impacting product performance.

[0003] The aperture, functionality, and performance of current space optical instruments and telescopes have significantly improved, and the scale of these products has become increasingly larger, leading to a corresponding increase in the scale of mechanical testing. Optical instruments are high-precision products. On the one hand, large optical instruments are constrained by factors such as precision and performance, and their mounting interfaces are sometimes not on the same mounting plane, which has multi-dimensional spatial characteristics. On the other hand, to ensure performance and accuracy, optical instruments require extremely high rigidity. Therefore, the testing fixtures used for mechanical environment testing have even higher rigidity requirements. In the case of multi-dimensional spatial interfaces, additional auxiliary support points are added to improve rigidity and resist harsh mechanical environments such as those caused by radiation. Therefore, the mounting interfaces of optical instruments are exceptionally complex, posing a significant challenge to high-rigidity mechanical fixtures. Summary of the Invention

[0004] To overcome the challenge of achieving high-rigidity, low-stress connection between the multi-dimensional spatial interface of high-rigidity large optical instruments and high-rigidity mechanical testing fixtures, a high-precision, high-rigidity, low-stress connection device for multi-dimensional spatial interfaces was invented.

[0005] This invention proposes a high-precision, high-rigidity, low-stress connection device for a multi-dimensional spatial interface. This connection device enables the connection between an optical instrument and a vibration table. The connection device includes a first interface, a second interface, a third interface, and a fourth interface.

[0006] The first interface includes a first adapter, a first interface ball seat, and a first interface support platform; wherein, the first adapter connects to the optical instrument, and the first interface support platform is mounted on the vibration table surface;

[0007] The second interface includes a second adapter, a second interface ball seat, and a second interface support platform; wherein, the second adapter connects to the optical instrument, and the second interface support platform is mounted on the vibration table surface;

[0008] The third interface includes a third adapter, a third interface ball seat, and a third interface support platform; the third adapter connects to the optical instrument, and the third interface support platform is mounted on the vibration table surface.

[0009] The fourth interface includes a fourth adapter and a fourth interface support platform; the fourth adapter connects to the optical instrument, and the fourth interface support platform is mounted on the vibration table surface.

[0010] The first and second interfaces are installed on both sides of the optical instrument, the third interface is installed on the front of the optical instrument, and the fourth interface is installed on the bottom of the optical instrument.

[0011] Advantages of this invention:

[0012] 1) It can realize the installation of multi-dimensional spatial interfaces for optical instruments, while taking into account both the high rigidity of the interface and the low stress requirements of the optical instruments.

[0013] 2) This design method is applicable to loads of various sizes and shapes, and has good versatility;

[0014] 3) Simple structure and easy to manufacture;

[0015] 4) Easy to install, debug, and test;

[0016] 5) It can be used repeatedly without affecting the rigidity, accuracy and other performance of the tooling. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0018] Figure 2 This is a partial cross-sectional schematic diagram of the present invention.

[0019] Figure 3 This is a partially enlarged view of the present invention.

[0020] In the diagram: 1 is the A-interface adapter; 2 is the A-interface support platform; 3 is the C-interface support platform; 4 is the C-interface adapter; 5 is the B-interface adapter; 6 is the B-interface support platform; 7 is the vibration table; 8 is the optical instrument; 9 is the D-interface adapter; 10 is the D-interface support platform; 11 is the C-interface ball mount; 12 is the B-interface ball mount; 13 is the A-interface ball mount. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below in conjunction with specific embodiments.

[0022] This invention proposes a high-precision, high-rigidity, low-stress connection device for a multi-dimensional spatial interface.

[0023] The interfaces at points A, B, and C are converted from mounting surfaces at different positions and orientations of the optical instrument to a single or parallel mounting surface via adapters. A ball-and-socket structure is used on the adapter mounting surface to achieve rigid constraint fixation with 6 degrees of freedom. Finally, a rigid support platform secures the interfaces at points A, B, and C to the vibration table surface.

[0024] The interface at point D employs a flexible leg design using four inclined thin-walled structures. Adjustments are made via mounting hole gaps in two horizontal linear dimensions and one rotational dimension perpendicular to the vibration table surface. Simultaneous opening or retraction of the four thin-walled legs by the same distance achieves linear adjustment along the vertical direction of the table surface, while opening or retracting them by different distances adjusts the tilt angle around the two horizontal axes, ensuring the release of all six degrees of freedom at point D. In summary, the interface at point D, together with the interfaces at points A, B, and C, achieves a fixed connection between the optical instrument and the vibration table, ensuring both high-rigidity connection and low-stress installation.

[0025] Furthermore, the three-point positioning principle is used to achieve a high-rigidity, low-stress fixed connection at the three interfaces. The interface can be a ball head or ball socket structure, a ball head or conical structure, or a structural variant using the three-point positioning principle.

[0026] Furthermore, in the case of achieving low-stress and high-rigidity connection with the 3-point positioning rigid interface, the auxiliary interface D can achieve high-rigidity and low-stress installation of all interfaces through methods such as adjusting the gap between mounting holes and flexible design. For example, the auxiliary interface D can also be implemented using structural forms such as 3 thin-walled legs, 2D unloading groove + flexible legs, and 1 pair of wedge-shaped adjustment blocks.

[0027] This invention proposes a multi-dimensional spatial interface with four mounting points: A, B, C, and D. First, the interfaces at points A, B, and C are connected to form a common or parallel mounting surface. After the connection, the common mounting surface interface is fixed using a three-point positioning principle. The specific structural form of the connection is a ball head and cone or a ball head and ball socket, etc. Due to the lack of redundant degrees of freedom constraints and low machining accuracy requirements of the three-point ball head and cone, the ball head and cone structure can rigidly and with low stress mount high-precision optical instruments onto a low-precision vibration table. The optical instrument itself is large and has high rigidity. To increase the connection rigidity with the vibration table, in addition to the three interfaces at points A, B, and C, a fourth interface at point D needs to be connected. Since the interfaces at points A, B, and C have already completely constrained six degrees of freedom of the optical instrument, the interface at point D needs to release degrees of freedom or be made flexible. At point D, a flexible design for the legs is achieved using four inclined thin-walled structures. Adjustments are made via mounting hole gaps in two horizontal linear dimensions and one rotational dimension perpendicular to the vibration table. Adjustment along the vertical direction of the table is achieved by simultaneously opening or retracting the four thin-walled legs by the same distance, while adjustment of the tilt angle around the two horizontal axes is achieved by opening or retracting the four thin-walled legs by different distances, ensuring the release of all six degrees of freedom at point D. The interface at point D, together with the interfaces at points A, B, and C, provides a fixed connection between the optical instrument and the vibration table, ensuring both high-rigidity connection and low-stress installation, effectively preventing accuracy loss or damage to the optical instrument due to multi-dimensional spatial interfaces and other factors.

[0028] Connection relationships of each component: The optical instrument is connected to the A-interface adapter, the A-interface ball joint then connects the A-interface adapter to the A-interface support platform, and the A-interface support platform is then connected to the vibration table surface; The optical instrument is connected to the B-interface adapter, the B-interface ball joint then connects the B-interface adapter to the B-interface support platform, and the B-interface support platform is then connected to the vibration table surface; The optical instrument is connected to the C-interface adapter, the C-interface ball joint then connects the C-interface adapter to the C-interface support platform, and the C-interface support platform is then connected to the vibration table surface; The optical instrument is connected to the D-interface adapter, the D-interface adapter connects to the D-interface support platform, and the D-interface support platform is then connected to the vibration table surface.

[0029] The following is also referred to the appendix. Figure 1-3The invention is further described below. The optical instrument 8 is fixed to the vibration table 7 sequentially via an A-interface adapter 1, an A-interface ball seat 13, and an A-interface support 2. The A-interface adapter 1 and the A-interface ball seat 13, through a ball-and-socket structure, allow for adjustment in three rotational directions. The optical instrument 8 is also fixed to the vibration table 7 sequentially via an B-interface adapter 5, a B-interface ball seat 12, and a B-interface support 6. The B-interface adapter 5 and the B-interface ball seat 12, through a ball-and-socket structure, allow for adjustment in three rotational directions. Finally, the optical instrument 8 is fixed to the vibration table 7 sequentially via an C-interface adapter 4, a C-interface ball seat 11, and a C-interface support 3. The C-interface adapter 4 and the C-interface ball seat 11, through a ball-and-socket structure, allow for adjustment in three rotational directions. Thus, the A, B, and C interfaces completely constrain the six degrees of freedom of the optical instrument 8. The optical instrument 8 is then connected to the vibration table 7 via the D-interface adapter 9 and the D-interface support platform 10, forming an additional fixed connection point for the optical instrument 8. The D-interface adapter 9 employs a flexible design with four inclined thin-walled structures for the legs. Adjustments are made through the mounting hole gaps in two horizontal linear dimensions and one rotational dimension perpendicular to the vibration table. The four thin-walled legs open or retract by the same distance simultaneously to achieve adjustment along the vertical direction of the table, and open or retract by different distances to adjust the tilt angle around the two horizontal axes, ensuring the release of six degrees of freedom at the mounting point D. Interface D, together with interfaces A, B, and C, achieves a fixed connection between the optical instrument 8 and the vibration table 7, ensuring both high-rigidity connection and low-stress installation, effectively preventing accuracy loss or damage to the optical instrument 7 due to multi-dimensional spatial interfaces and other factors.

[0030] The parts of this invention not described in detail are well-known in the field.

Claims

1. A high-precision, high-rigidity, low-stress connection device for a multi-dimensional spatial interface, which enables the connection between an optical instrument and a vibration table, characterized in that: The connecting device includes a first interface, a second interface, a third interface, and a fourth interface; The first interface includes a first adapter, a first interface ball seat, and a first interface support platform; wherein, the first adapter connects to the optical instrument, and the first interface support platform is mounted on the vibration table surface; The second interface includes a second adapter, a second interface ball seat, and a second interface support platform; wherein, the second adapter connects to the optical instrument, and the second interface support platform is mounted on the vibration table surface; The third interface includes a third adapter, a third interface ball seat, and a third interface support platform; the third adapter connects to the optical instrument, and the third interface support platform is mounted on the vibration table surface. The fourth interface includes a fourth adapter and a fourth interface support platform; the fourth adapter connects to the optical instrument, and the fourth interface support platform is mounted on the vibration table surface. The first and second interfaces are installed on both sides of the optical instrument, the third interface is installed on the front of the optical instrument, and the fourth interface is installed on the bottom of the optical instrument. The interface adapter and the interface ball seat achieve adjustment in three rotational directions and rigid constraint fixation with 6 degrees of freedom through the cooperation of the ball socket and ball head or the ball head and conical structure. The fourth interface adapter adopts a structure of 4 inclined thin-walled legs. The 4 thin-walled legs can be opened or closed by the same distance at the same time to achieve adjustment in the vertical direction along the vibration table surface. The 4 thin-walled legs can be opened or closed by different distances to achieve adjustment of the tilt angle around 2 horizontal axes.

2. The connecting device according to claim 1, characterized in that, The fourth interface uses three thin-walled legs instead of four thin-walled legs.

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