CN216131590U

CN216131590U - Rigid-flexible coupled multi-dimensional vibration isolation platform

Info

Publication number: CN216131590U
Application number: CN202120889033.1U
Authority: CN
Inventors: 张英; 郭晓东; 陈卓; 程爽; 谢嘉乐
Original assignee: Beijing Jiaotong University
Current assignee: Beijing Jiaotong University
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2022-03-25
Anticipated expiration: 2031-04-27

Abstract

The utility model relates to a rigid-flexible coupled multi-dimensional vibration isolation platform which mainly comprises a lower platform, a lower platform guide connecting block, a lower flexible hinge, a hollow cylindrical guide rod, a solid cylindrical guide rod, an upper flexible hinge, an upper platform guide connecting block and an upper platform. In order to solve the problems of large occupied space, small vibration isolation amplitude, high frequency, complex structure and the like of the traditional multi-dimensional vibration isolation platform, the multi-dimensional vibration isolation platform takes the flexible hinge as a torsion spring unit of the vibration isolation platform, realizes the length change of a branched chain in a larger range through small-angle torsion of the flexible hinge, and meets the vibration isolation requirement of larger-amplitude vibration. By adopting the joint hinge without rigidity, the overall rigidity of the multidimensional vibration isolation platform is reduced, vibration isolation in a low frequency range is realized, and the vibration isolation frequency domain of the multidimensional vibration isolation platform is widened. The multi-dimensional vibration isolation platform adopts the same branched chain form, has simple structure and strong symmetry, avoids the kinematic coupling among the branched chains, has strong interchangeability of parts, is convenient to maintain, has small volume and light weight, and is convenient to install.

Description

Rigid-flexible coupled multi-dimensional vibration isolation platform

Technical Field

The utility model relates to the field of mechanical dynamics and vibration, in particular to a rigid-flexible coupled multi-dimensional vibration isolation platform.

Background

The common multidimensional vibration isolation platform mainly comprises a multidimensional vibration isolation function realized in two modes of series-parallel combination by adopting a single-dimensional vibration isolator and plane uniform arrangement by adopting a six-dimensional vibration isolator. The single-dimensional vibration isolators are adopted for linear combination, the number of the vibration isolators is large, the occupied space is large, and the vibration isolation effect is difficult to realize for some equipment with small installation space. The single-dimensional vibration isolators are arranged in parallel, so that the space occupancy rate of the multi-dimensional vibration isolation platform can be effectively improved, and the service environment of the multi-dimensional vibration isolation platform is expanded. However, the conventional single-dimensional vibration isolator has a complex structure and large self weight, so that the application environment is limited. The vibration isolation platform designed by the fully flexible hinge has a good vibration isolation effect on micro-amplitude vibration, but the vibration isolation amplitude is small because the vibration isolation platform only adopts the flexible hinge to realize the action of the upper platform.

The utility model adopts a rigid-flexible coupling design, enlarges the motion space of the multi-dimensional vibration isolation platform, widens the vibration isolation frequency domain and improves the vibration isolation amplitude.

Disclosure of Invention

The utility model aims to provide a rigid-flexible coupled multi-dimensional vibration isolation platform which has a larger motion space and a lower natural frequency compared with the existing multi-dimensional vibration isolation platform and meets the vibration isolation requirement under the excitation of larger-amplitude vibration in a wider vibration isolation frequency domain range.

In order to achieve the purpose, the utility model adopts the technical scheme that:

the utility model provides a multidimension vibration isolation platform mainly comprises lower platform 1, lower platform direction connecting block 2, lower flexible hinge 3, hollow cylinder guide arm 4, solid cylinder guide arm 5, last flexible hinge 6, upper mounting plate direction connecting block 7 and upper mounting plate 8, its characterized in that: the lower platform 1 is fixedly connected with the lower platform guide connecting block 2 through a bolt; the lower platform guide connecting block 2 is fixedly connected with the lower flexible hinge 3 through a bolt; the lower flexible hinge 3 is fixedly connected with the hollow cylindrical guide rod 4 through a bolt; the hollow cylindrical guide rod 4 and the solid cylindrical guide rod 5 are coaxially assembled, no acting force is applied along the axial direction, and the hollow cylindrical guide rod and the solid cylindrical guide rod can freely move; the solid cylindrical guide rod 5 is fixedly connected with the upper flexible hinge 6 through a bolt; the upper flexible hinge 6 is fixedly connected with the upper platform guide connecting block 7 through a bolt; the upper platform guide connecting block 7 is fixedly connected with the upper platform 8 through bolts.

The beneficial effects of the utility model are: 1. the flexible hinge is used as a spring unit of the multidimensional vibration isolation platform, the six-dimensional vibration isolation effect of the multidimensional vibration isolation platform is realized through the angular bending deformation of the flexible hinge, the motion space of the multidimensional vibration isolation platform is improved, and the vibration isolation effect of large-amplitude vibration is realized. 2. The upper platform and the lower platform are connected with the branched chain through the flexible hinges, the branched chain guide rod adopts the rigid moving pair with a simple structure, the weight of the branched chain is reduced under the condition of ensuring the bearing capacity of the multi-dimensional vibration isolation platform, meanwhile, the inherent frequency of the multi-dimensional vibration isolation platform is reduced, and the vibration isolation frequency domain is widened. 3. The branched chains are symmetrically arranged, so that the stability of the multi-dimensional vibration isolation platform is improved, and the motion coupling condition of the upper platform is reduced. 4. The flexible hinge adopts an elliptical notch structure, the stress distribution is uniform, the vibration mode meets the vibration requirement of the multidimensional vibration isolation platform, and the vibration isolation effect of the multidimensional vibration isolation platform is ensured. 5. The multi-dimensional vibration isolation platform is simple in structure, small in occupied space, light in weight, high in interchangeability of parts and convenient to install and maintain.

Drawings

The utility model is further described with reference to the following figures and examples.

FIG. 1 is a schematic layout view of a rigid-flexible coupling multi-dimensional vibration isolation platform;

FIG. 2 is a schematic diagram of spatial arrangement of rigid-flexible coupling multi-dimensional vibration isolation platform branched chains;

FIG. 3 is a schematic connection diagram of a rigid-flexible coupling multi-dimensional vibration isolation platform branched chain;

FIG. 4 is a schematic diagram of the spatial arrangement of the guide connecting blocks of the rigid-flexible coupling multi-dimensional vibration isolation platform;

FIG. 5 is a schematic structural view of a flexible hinge of a rigid-flexible coupling multi-dimensional vibration isolation platform;

FIG. 6 is a schematic view of lubrication of a rigid-flexible coupling multi-dimensional vibration isolation platform;

FIG. 7 is a schematic view of an upper platform of a rigid-flexible coupling multi-dimensional vibration isolation platform;

in the figure: 1. the device comprises a lower platform, 2, a lower platform guide connecting block, 3, a lower flexible hinge, 4, a hollow cylindrical guide rod, 5, a solid cylindrical guide rod, 6, an upper flexible hinge, 7, an upper platform guide connecting block and 8, an upper platform.

Detailed Description

As shown in fig. 1, a lower platform 1 is fixedly connected with a lower platform guide connecting block 2 through bolts; the lower platform guide connecting block 2 is fixedly connected with the lower flexible hinge 3 through a bolt; the lower flexible hinge 3 is fixedly connected with the hollow cylindrical guide rod 4 through a bolt; the hollow cylindrical guide rod 4 and the solid cylindrical guide rod 5 are coaxially assembled, and the stability of the upper platform is ensured by utilizing the geometric constraint among all the branch chains; the solid cylindrical guide rod 5 is fixedly connected with the upper flexible hinge 6 through a bolt; the upper flexible hinge 6 is fixedly connected with the upper platform guide connecting block 7 through a bolt; the upper platform guide connecting block 7 is fixedly connected with the upper platform 8 through bolts.

As shown in fig. 2, the branched chain is composed of a lower flexible hinge 3, a hollow cylindrical guide rod 4, a solid cylindrical guide rod 5 and an upper flexible hinge 6; in an initial state, three adjacent branched chains of the multi-dimensional vibration isolation platform are mutually vertical.

As shown in fig. 3, each lower platform guide connecting block 2 and each upper platform guide connecting block 7 are respectively connected with two branched chains; when no external force is applied, the branched chains are in a mutually vertical state.

As shown in fig. 4, the lower platform guide connecting blocks 2 and the upper platform guide connecting blocks 7 are uniformly distributed at 120 degrees; the adjacent lower platform guide connecting blocks 2 and the upper platform guide connecting blocks 7 are arranged oppositely, and the vertical included angle is 60 degrees.

As shown in fig. 5, the lower flexible hinge 3 and the upper flexible hinge 6 are rotationally symmetric structures, so that the mechanical characteristics of the rotation of the lower flexible hinge and the upper flexible hinge in all directions are the same, the spatial rigidity distribution of the multi-dimensional vibration isolation platform is more uniform, the bearing capacity of the multi-dimensional vibration isolation platform is improved, and the coupling condition of movement in all dimensions is reduced. The flexible hinge adopts an elliptical notch form, so that the stress concentration phenomenon in the stress process is reduced, the bearing capacity of the flexible hinge is improved, and the service life of the flexible hinge is prolonged.

As shown in fig. 6, the gap between the hollow cylindrical guide rod 4 and the solid cylindrical guide rod 5 is filled with grease, so that friction is reduced, smooth motion of the solid cylindrical guide rod 5 in the hollow cylindrical guide rod 4 is ensured, and the vibration isolation effect is improved. The semi-closed structure formed between the hollow cylindrical guide rod 4 and the solid cylindrical guide rod 5 is beneficial to storing lubricating grease, and the influence of impurities such as dust and particles on the movement of the guide rod is avoided. Meanwhile, the branched chain is designed to be a split structure, so that the parts can be detached respectively for installation and maintenance.

As shown in fig. 7, the upper platform 8 adopts a lightweight design, so that the weight of the multi-dimensional vibration isolation platform is reduced; and a connecting interface is designed on the device for fixing different devices.

The principle of the rigid-flexible coupled multi-dimensional vibration isolation platform for realizing the vibration isolation function is as follows.

When the multidimensional vibration isolation platform is in a static stable state, the flexible hinge is subjected to the action of gravity to generate bending deformation, the branched chain is ensured to be in a certain pose state corresponding to torque, and the stability of the upper platform 8 is further ensured. When the lower platform is excited, the lower flexible hinge 3 and the upper flexible hinge 6 are elastically deformed, and bending deformation is generated in the movement process, so that the branched chain moves in a certain pose state. Because the movable space between the hollow cylindrical guide rod 4 and the solid cylindrical guide rod 5 is larger, the length change of the branched chain in a larger range can be realized. According to the relation between the length of the branched chain and the pose of the upper platform, the multi-dimensional vibration isolation platform can realize the vibration isolation effect under the condition of large vibration excitation amplitude. Meanwhile, the multidimensional vibration isolation platform only has joint rigidity at the position of the flexible hinge, and the constrained connection between the spatial cylindrical guide rod 4 and the solid cylindrical guide rod 5 can be regarded as a joint without rigidity, so that the overall rigidity of the multidimensional vibration isolation platform is smaller, the natural frequency is lower, vibration isolation under lower vibration frequency can be realized, and the vibration isolation frequency domain is expanded.

Although the present invention has been described with reference to specific embodiments, it should not be construed as being limited to the embodiments set forth herein. It will be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the utility model, the scope of which is defined by the appended claims.

Claims

1. The utility model provides a multidimension vibration isolation platform of rigid-flexible coupling, mainly by platform (1) down, platform direction connecting block (2), flexible hinge (3) down, hollow cylinder guide arm (4), solid cylinder guide arm (5), go up flexible hinge (6), go up platform direction connecting block (7) and go up platform (8) and constitute its characterized in that: the lower platform (1) is fixedly connected with the lower platform guide connecting block (2) through bolts; the lower platform guide connecting block (2) is fixedly connected with the lower flexible hinge (3) through a bolt; the lower flexible hinge (3) is fixedly connected with the hollow cylindrical guide rod (4) through a bolt; the hollow cylindrical guide rod (4) and the solid cylindrical guide rod (5) are coaxially assembled, no acting force is applied along the axial direction, and the hollow cylindrical guide rod and the solid cylindrical guide rod can freely move; the solid cylindrical guide rod (5) is fixedly connected with the upper flexible hinge (6) through a bolt; the upper flexible hinge (6) is fixedly connected with the upper platform guide connecting block (7) through a bolt; the upper platform guide connecting block (7) is fixedly connected with the upper platform (8) through a bolt.

2. The multi-dimensional vibration isolation platform of claim 1, wherein: the branched chain consists of a lower flexible hinge (3), a hollow cylindrical guide rod (4), a solid cylindrical guide rod (5) and an upper flexible hinge (6); when no external force is applied, three adjacent branched chains of the multi-dimensional vibration isolation platform are mutually vertical.

3. The multi-dimensional vibration isolation platform of claim 1, wherein: each lower platform guide connecting block (2) and each upper platform guide connecting block (7) are respectively connected with two branched chains; when no external force is applied, the branched chains are in a mutually vertical state.

4. The multi-dimensional vibration isolation platform of claim 1, wherein: the lower platform guide connecting blocks (2) and the upper platform guide connecting blocks (7) are uniformly distributed at 120 degrees; the adjacent lower platform guide connecting blocks (2) and the upper platform guide connecting blocks (7) are arranged in opposite directions, and the vertical included angle is 60 degrees.

5. The multi-dimensional vibration isolation platform of claim 1, wherein: the lower flexible hinge (3) and the upper flexible hinge (6) are in rotational symmetry structures, and the notch is in an oval shape.

6. The multi-dimensional vibration isolation platform of claim 1, wherein: the hollow cylindrical guide rod (4) and the solid cylindrical guide rod (5) are assembled in a clearance mode, and lubricating grease is filled in the clearance, so that the solid cylindrical guide rod (5) can move smoothly in the hollow cylindrical guide rod (4).

7. The multi-dimensional vibration isolation platform of claim 1, wherein: the upper platform (8) is designed in a light weight mode, and a connecting interface is designed.