A vibration reduction mechanism

Abstract

The present invention discloses a vibration damping mechanism comprising an external connecting flange, eight vibration damping units, and an internal connecting flange. The external connecting flange is used to connect the vibration damping mechanism to a carrier aircraft, while the internal connecting flange is used to securely connect the main structure of a photoelectric detection device to the vibration damping mechanism. The vibration damping units connect the external connecting flange and the internal connecting flange to form the vibration damping mechanism. The present invention has a simple structure and compact assembly. While providing effective vibration damping for the photoelectric detection device, it can decouple the device's translational and rotational degrees of freedom, ensuring that the load does not generate rotational motion under external linear vibration input conditions. This improves the working environment of the sensor within the photoelectric detection device and reduces the swing amplitude of the device's lower structure, thereby increasing the utilization rate of the device's internal space.

Description

Technical Field

[0001] The invention belongs to the technical field of passive vibration reduction mechanisms and relates to a vibration reduction mechanism. Background Art

[0002] Airborne electro-optical reconnaissance equipment is a core component of modern battlefield intelligence acquisition, situational awareness, and damage assessment. Through integrated passive vibration reduction mechanisms and active servo stabilization control systems, it isolates interference from aircraft vibration and attitude changes on its internal electro-optical detection payload, enabling continuous and efficient observation of target areas / objects. The passive vibration reduction mechanism integrated within the electro-optical reconnaissance equipment primarily isolates medium- and high-frequency vibrations, and its isolation significantly impacts the line-of-sight stability accuracy of the electro-optical detection payload.

[0003] Currently, most airborne optoelectronic reconnaissance equipment uses multiple rubber or metal vibration dampers with approximately three-dimensional equal stiffness to directly support and passively dampen the optoelectronic payload. This vibration damping method meets the passive vibration damping requirements of airborne optoelectronic reconnaissance equipment to a certain extent. However, for two-axis, two-frame optoelectronic equipment, since the vibration dampers are usually arranged on the top of the equipment, the linear motion and rotational motion degrees of freedom of the optoelectronic reconnaissance equipment are not decoupled. As a result, the lower part of the equipment will have a large deflection amplitude under the action of external linear vibration, which has an adverse impact on the performance and adaptability of the equipment. For two-axis, four-frame optoelectronic equipment, in order to control the rotation center of the vibration damping mechanism at the geometric center of the optoelectronic payload and decouple the linear motion and rotational motion degrees of freedom of the optoelectronic payload, multiple vibration dampers need to be arranged symmetrically around the center of gravity of the optoelectronic payload. This configuration reduces the flexibility of payload placement. Summary of the Invention

[0004] (1) Purpose of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of existing vibration reduction mechanisms in response to the vibration reduction needs of airborne optoelectronic reconnaissance equipment and provide a vibration reduction mechanism with a simple structure, which can decouple the load line motion and the rotational motion freedom under the condition of vibration absorber bias.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a vibration reduction mechanism, including an external connecting flange 1, eight vibration reduction units 2 and an internal connecting flange 3; the external connecting flange is used to connect the vibration reduction mechanism with the carrier, and the internal connecting flange is used to fix the main structure of the photoelectric detection equipment to the vibration reduction mechanism, and the vibration reduction unit 2 connects the external connecting flange 1 with the internal connecting flange 3 to form a vibration reduction mechanism.

[0008] Among them, the eight vibration damping units 2 are grouped in pairs, and the four groups of vibration damping units are evenly arranged in the circumferential direction. The axes of the two vibration damping units 2 in the same group are parallel. The four groups of vibration damping units 2 are evenly arranged around the central axis of the vibration damping mechanism. The axes of the two opposite vibration damping units 2 intersect, and the four intersection points are on the same plane.

[0009] Each vibration damping unit 2 includes a first mounting seat 2-1, a second mounting seat 2-9, a first locking screw 2-2, a second locking screw 2-8, a first universal joint 2-3, a second universal joint 2-7, a guide rod 2-4, a guide sleeve 2-5, a limit block 2-6, a transition connector 2-10, a vibration damper 2-11 and multiple connecting screws.

[0010] The guide sleeve 2-5 is fixedly connected to the second universal joint 2-7 through a transition connector 2-10; one end of the guide rod 2-4 is fixedly connected to the first universal joint 2-3, and the other end of the guide rod 2-4 is inserted into the guide sleeve 2-5, and a limit block 2-6 is installed at the end of the guide rod 2-4, so that the guide rod 2-4 can slide freely in the axial direction in the guide sleeve 2-5 and cannot fall out, forming a sliding secondary structure; the first universal joint 2-3 and the second universal joint 2-7 are respectively fixed to the first mounting seat 2-1 and the second mounting seat 2-9 by locking screws, one end of the shock absorber 2-11 is fixedly connected to the guide sleeve 2-5 through a transition connector 2-10, and the other end crosses the guide sleeve 2-5 and is fixed to the guide rod 2-4, and the first mounting seat 2-1 and the second mounting seat 2-9 of the vibration damping unit are respectively connected to the aforementioned external connecting flange 1 and the internal connecting flange 3.

[0011] (3) Beneficial effects

[0012] The vibration reduction mechanism provided by the above technical solution has a simple structure and compact assembly. While providing effective vibration reduction for the photoelectric detection equipment, it can decouple the translational and rotational degrees of freedom of the equipment, so that the load does not generate rotational motion under the condition of external linear vibration input, thereby improving the working environment of the internal sensor of the photoelectric detection equipment and reducing the swing amplitude of the lower structure of the photoelectric detection equipment, which is conducive to improving the utilization rate of the internal space of the photoelectric detection equipment; and by adjusting the direction and spacing of the vibration reduction unit, the support stiffness of the vibration reduction mechanism for the photoelectric detection equipment can be changed; in particular, when the angle between the vibration reduction unit and the horizontal plane is 35.2644°, the support stiffness of the vibration reduction mechanism for the linear motion of the photoelectric detection equipment in the three orthogonal directions is equal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an isometric view of the vibration reduction mechanism according to an embodiment of the present invention.

[0014] Figure 2 It is a front view of the vibration reduction mechanism according to an embodiment of the present invention.

[0015] Figure 3-1 and3-2 They are respectively a cross-sectional view and an isometric view of a vibration damping unit according to an embodiment of the present invention.

[0016] Figure 4 This is a front view of the optoelectronic detection equipment installed behind the vibration reduction mechanism.

[0017] Figure 5 This is an axonometric view of the optoelectronic detection equipment installed behind the vibration reduction mechanism. DETAILED DESCRIPTION

[0018] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0019] like Figure 1 As shown, the vibration reduction mechanism of this embodiment includes an external connecting flange 1, eight vibration reduction units 2 and an internal connecting flange 3; the external connecting flange is used to connect the vibration reduction mechanism to the carrier, and the internal connecting flange is used to fix the main structure of the optoelectronic detection equipment to the vibration reduction mechanism. The vibration reduction unit 2 connects the external connecting flange 1 and the internal connecting flange 3 to form a vibration reduction mechanism.

[0020] Among them, the eight vibration damping units 2 are grouped in pairs, and the four groups of vibration damping units are evenly arranged in the circumferential direction. The axes of the two vibration damping units 2 in the same group are parallel. The four groups of vibration damping units 2 are evenly arranged around the central axis of the vibration damping mechanism. The axes of the two opposite vibration damping units 2 intersect, and the four intersection points are on the same plane.

[0021] like Figure 2 As shown, all the vibration damping units 2 have the same angle with the horizontal plane, which is represented by θ in the figure; the spacing between the vibration damping units 2 parallel to the axes of the same group is the same, which is represented by l in the figure.

[0022] As shown in Figure 3, each vibration damping unit 2 includes a first mounting seat 2-1, a second mounting seat 2-9, a first locking screw 2-2, a second locking screw 2-8, a first universal joint 2-3, a second universal joint 2-7, a guide rod 2-4, a guide sleeve 2-5, a limit block 2-6, a transition connector 2-10, a vibration damper 2-11 and multiple connecting screws.

[0023] Among them, the first locking screw 2-2 and the second locking screw 2-8 fix the first universal joint 2-3 and the second universal joint 2-7 on the first mounting seat 2-1 and the second mounting seat 2-9 respectively. The first universal joint 2-3 and the second universal joint 2-7 are fixedly connected to the guide rod 2-4 and the transition connector 2-10 respectively through threads. The guide rod 2-4 is inserted into the guide sleeve 2-5. A limit block 2-6 is installed at the end of the guide rod 2-4 to prevent the guide rod 2-4 from falling out of the guide sleeve 2-5. The guide sleeve 2-5 is fixedly connected to the transition connector 2-10 by screws, and the two ends of the shock absorber 2-11 are fixed to the guide rod 2-4 and the transition connector 2-10 respectively by screws.

[0024] The cylindrical portion at the lower end of the guide rod 2-4 and the inner bore of the guide sleeve 2-5 are matched with appropriate tolerances, allowing them to slide relative to each other along the axis of the inner bore of the guide sleeve 2-5. Due to the presence of the first universal joint 2-3 and the second universal joint 2-7, the first mounting seat 2-1 and the second mounting seat 2-9 at each end of the vibration damping unit undergo relative movement, and the vibration damper 2-11 undergoes only axial tension and compression. Therefore, the vibration damping unit provides stiffness and damping only along its axis and does not provide support stiffness or damping in other directions.

[0025] The shock absorber 2-11 is a hollow structure with an external connection structure at the end. It is usually made of high-rigidity metal or hard non-metallic materials such as steel, titanium alloy, aluminum alloy, etc. The middle is a cylindrical structure made of high-damping shock-absorbing materials such as rubber, metal rubber, etc.

[0026] like Figure 4 、 Figure 5 As shown, the photoelectric detection equipment is fixedly mounted on the inner connecting flange 3, and the outer connecting flange 1 is connected to the carrier (not shown in the figure). By adjusting the appropriate counterweight, the center of gravity of the photoelectric detection equipment is adjusted to the center position of the four intersection points of the four groups of vibration reduction units. At this time, the rotational degree of freedom and the translational degree of freedom of the photoelectric detection load are decoupled, which can overcome the rotation of the equipment caused by external linear vibration disturbances to the greatest extent.

[0027] By adjusting the angle θ, the linear motion support stiffness of the vibration reduction mechanism for the photoelectric detection device can be changed. In particular, when θ = 35.2644°, the linear motion support stiffness of the vibration reduction mechanism for the photoelectric detection device in three orthogonal directions is equal.

[0028] By adjusting the spacing l and the angle θ simultaneously, the support stiffness of the vibration reduction mechanism for the rotational motion of the photoelectric detection device in three orthogonal directions can be changed to be equal.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vibration reduction mechanism, characterized in that: include: An external connection flange (1), eight vibration reduction units (2) and an internal connection flange (3); the external connection flange is used to connect the vibration reduction mechanism and the carrier, and the internal connection flange is used to fix the main structure of the photoelectric detection equipment to the vibration reduction mechanism. The vibration reduction unit (2) connects the external connection flange (1) and the internal connection flange (3) to form a vibration reduction mechanism; The eight vibration damping units (2) are arranged in groups of two, and the four groups of vibration damping units are evenly arranged in the circumferential direction. The axes of the two vibration damping units (2) in the same group are parallel. The four groups of vibration damping units (2) are evenly arranged around the central axis of the vibration damping mechanism. The axes of the two opposing vibration damping units (2) intersect, and the four intersection points are on the same plane. The eight vibration-damping units (2) have the same angle with the horizontal plane; the spacing between the vibration-damping units (2) parallel to the axes of the same group is the same; The photoelectric detection device is fixedly mounted on the inner connecting flange (3), and the outer connecting flange (1) is connected to the carrier. By adjusting the counterweight, the center of gravity of the photoelectric detection device is adjusted to the center position of the four intersection points of the four groups of vibration reduction units. At this time, the rotational freedom degree and the translational freedom degree of the photoelectric detection load are decoupled, and the rotation of the device caused by the external linear vibration disturbance can be overcome to the greatest extent.

2. The vibration damping mechanism according to claim 1, wherein: Each of the vibration damping units (2) comprises a first mounting seat (2-1), a second mounting seat (2-9), a first universal joint (2-3), a second universal joint (2-7), a guide rod (2-4), a guide sleeve (2-5), a transition connector (2-10), and a vibration damper (2-11); the guide sleeve (2-5) is fixedly connected to the second universal joint (2-7) via the transition connector (2-10); one end of the guide rod (2-4) is fixedly connected to the first universal joint (2-3), and the other end of the guide rod (2-4) is inserted into the guide sleeve (2-5). A sliding pair structure is formed; the first universal joint (2-3) and the second universal joint (2-7) are respectively fixed to the first mounting seat (2-1) and the second mounting seat (2-9) by means of locking screws; one end of the shock absorber (2-11) is fixedly connected to the guide sleeve (2-5) by means of a transition connector (2-10); the other end thereof is fixedly connected to the guide rod (2-4) across the guide sleeve (2-5); the first mounting seat (2-1) and the second mounting seat (2-9) of the shock absorber unit are respectively connected to the aforementioned external connection flange (1) and the internal connection flange (3).

3. The vibration damping mechanism according to claim 2, wherein: The vibration reduction unit (2) further comprises a first locking screw (2-2) and a second locking screw (2-8), wherein the first locking screw (2-2) and the second locking screw (2-8) respectively fix the first universal joint (2-3) and the second universal joint (2-7) to the first mounting seat (2-1) and the second mounting seat (2-9).

4. The vibration damping mechanism according to claim 3, wherein: A limiting block (2-6) is installed at the end of the guide rod (2-4), so that the guide rod (2-4) can slide freely along the axial direction in the guide sleeve (2-5) and cannot fall out.

5. The vibration damping mechanism according to claim 4, wherein: The first universal joint (2-3) and the second universal joint (2-7) are respectively fixedly connected to the guide rod (2-4) and the transition connecting piece (2-10) through threads; the guide sleeve (2-5) is fixedly connected to the transition connecting piece (2-10) through screws, and both ends of the shock absorber (2-11) are respectively fixed to the guide rod (2-4) and the transition connecting piece (2-10) through screws.

6. The vibration damping mechanism according to claim 5, wherein: The shock absorber (2-11) is a hollow structure, the ends of which are external connection structures, and the middle is a cylindrical structure.

7. The vibration damping mechanism according to claim 6, wherein: The end portion of the shock absorber (2-11) is made of steel, titanium alloy, or aluminum alloy, and the middle portion of the shock absorber (2-11) is made of rubber.

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