A metal vibration isolation device with adjustable stiffness

Abstract

The present invention discloses a metal vibration isolation device with adjustable stiffness, which includes a base, a shell, a sleeve, an upper metal rubber, a lower metal rubber, a clamp, an adjusting screw, a connecting rod and a driving motor; the bottom of the shell is fixedly connected to the base; the bottom end of the sleeve is accommodated in a cavity between the base and the shell, the top end extends out of the shell through a first through hole, and an annular baffle is provided on the outer peripheral surface in the cavity; the upper metal rubber is located on the upper side of the annular baffle; the lower metal rubber is located on the lower side of the annular baffle; the clamp is sleeved on the outer peripheral side of the upper metal rubber and the lower metal rubber, and a first ear piece and a second ear piece are provided at the joint; the adjusting screw passes through the first ear piece and is threadedly connected to the second ear piece, and the other end is fixedly connected to the driving motor through a connecting rod. The above-mentioned metal vibration isolation device can realize in-situ adjustment of stiffness without disassembly, and is suitable for the launch and on-orbit stages of spacecraft payloads.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical vibration isolation, and in particular to a metal vibration isolation device with adjustable stiffness. Background Art

[0002] With the development of aerospace technology, for high-precision and high-stability satellites such as high-resolution remote sensing satellites, space telescopes, and laser communication satellites, the micro-vibration of moving parts such as the control moment gyro and tracking scanning mechanism on the satellite platform has an increasingly obvious impact on the performance of payloads such as cameras and antennas. In order to reduce the impact of on-orbit micro-vibration, vibration isolation measures need to be taken for the disturbance source or payload.

[0003] Metal rubber has a nonlinear characteristic that its stiffness increases with the amount of compression. Metal vibration isolation devices composed of metal rubber as the core component have the advantages of strong adaptability to space environment and compatibility with launch and on-orbit mechanics requirements to a certain extent. They are currently widely used in spacecraft. As a passive vibration isolation device, its basic principle is to achieve isolation of high-frequency vibrations through low stiffness. However, in actual use, it is often necessary to adjust the stiffness of the vibration isolation device to meet the needs of different development and use stages of spacecraft.

[0004] On the one hand, the demand for on-track vibration isolation requires the vibration isolation device to have low stiffness. However, the low-rigidity vibration isolation device will produce a large response in the launch section and cannot guarantee the safety of the object being isolated. If a locking release device is connected in parallel with the vibration isolation device, it will also bring weight and reliability problems. Therefore, the ideal vibration isolation device should have the characteristics of "high stiffness in the launch section and low stiffness in the on-track section". However, it is difficult to achieve such a large range of stiffness changes by only relying on the compression of the metal rubber by the overload of the launch section.

[0005] On the other hand, the disturbance characteristics of the onboard disturbance source may change at the end of its life, but the stiffness of the metal rubber is fixed in the state of orbital weightlessness, and the stiffness of the metal vibration isolation device cannot be adjusted accordingly to ensure the vibration isolation effect. In addition, during the ground installation and adjustment of the vibration isolation device, if the dynamic characteristics of the vibration isolation object deviate from the expected value, it is also necessary to be able to adjust its stiffness in a convenient way. Summary of the invention

[0006] In view of this, the present invention provides a metal vibration isolation device with adjustable stiffness, which can achieve in-situ adjustment of stiffness without disassembly, and is suitable for the launch and on-orbit stages of spacecraft payloads.

[0007] The present invention adopts the following specific technical solutions:

[0008] A metal vibration isolation device with adjustable stiffness, comprising:

[0009] Base;

[0010] The housing has a first through hole on the top surface, a first opening on the side surface, and a bottom fixedly connected to the top surface of the base;

[0011] A sleeve, the bottom end of which is accommodated in the cavity between the base and the shell, the top end of which extends out of the shell through the first through hole, and an annular baffle with an outer diameter larger than the aperture of the first through hole is provided on the outer peripheral surface in the cavity;

[0012] The upper metal rubber is an annular structure, located on the upper side of the annular baffle, and sleeved on the outer peripheral side of the sleeve;

[0013] The lower metal rubber is an annular structure, is located at the lower side of the annular baffle, and is sleeved on the outer peripheral side of the sleeve;

[0014] A clamp is sleeved on the outer peripheral sides of the upper metal rubber and the lower metal rubber, and is provided with a first ear piece and a second ear piece extending out of the housing through the first opening at the joint; there is a distance between the first ear piece and the second ear piece;

[0015] an adjusting screw, one end of which passes through the first ear piece and is threadedly connected to the second ear piece, and the other end of which is fixedly connected to the driving motor through a connecting rod;

[0016] The driving motor is used to drive the adjusting screw to rotate and control the screwing depth of the adjusting screw to adjust the distance between the first ear piece and the second ear piece, thereby achieving stiffness adjustment by changing the radial compression amount of the lower metal rubber and the upper metal rubber.

[0017] Furthermore, at least one ball-and-socket washer and a spherical washer are provided between the adjusting screw and the first ear piece;

[0018] The ball and socket washer is provided with a spherical hole, the aperture of which gradually decreases in a direction from the first ear piece toward the second ear piece;

[0019] The outer peripheral surface of the spherical washer is a spherical surface that matches the shape of the spherical hole, and the outer diameter of the spherical surface gradually decreases in the direction from the first ear piece to the second ear piece;

[0020] The spherical washer is sleeved on the outer peripheral side of the adjusting screw, and the ball socket washer is sleeved on the outer peripheral side of the spherical washer.

[0021] Furthermore, it also includes an adjustment washer installed on the adjustment screw between the first ear piece and the second ear piece;

[0022] The adjusting washer is provided with a second opening in the circumferential direction, and is used for being installed on the adjusting screw through the second opening.

[0023] Furthermore, it also includes a fixing screw;

[0024] The first ear piece is provided with a second through hole for passing the adjusting screw;

[0025] The second ear piece is provided with a first threaded hole and a second threaded hole; the first threaded hole corresponds to the second through hole one by one;

[0026] The adjusting screw passes through the second through hole and is threadedly connected with the first threaded hole;

[0027] The outer circumferential surface of the housing is provided with an ear plate corresponding to the position of the second ear piece, and the ear plate is provided with third through holes corresponding one-to-one to the second threaded holes;

[0028] One end of the fixing screw passes through the third through hole and is threadedly connected to the second threaded hole, so as to fix the clamp to the housing to prevent dislocation in a vibration environment.

[0029] Furthermore, the clamp is made of 60Si2Mn or 65Mn material.

[0030] Beneficial effects:

[0031] (1) The metal vibration isolation device of the present invention has a sleeve disposed in a cavity between a base and a shell, an annular baffle is disposed on the outer peripheral surface of the sleeve in the cavity, an upper metal rubber is mounted on the upper side of the annular baffle, and a lower metal rubber is mounted on the lower side, a clamp is sleeved on the outer peripheral side of the upper metal rubber and the lower metal rubber, and the clamp is provided with a first ear piece and a second ear piece extending out of the shell at a joint, one end of the adjusting screw passes through the first ear piece and is threadedly connected to the second ear piece, and the other end is fixedly connected to the driving motor through a connecting rod, and the driving motor drives the adjusting screw to rotate to control its screwing depth, and the distance between the first ear piece and the second ear piece is adjusted so as to The stiffness is adjusted by changing the radial compression of the lower metal rubber and the upper metal rubber. Since the screwing depth of the adjusting screw is controlled by the driving motor, the distance between the first ear piece and the second ear piece can be adjusted, and the stiffness is adjusted by controlling the radial compression of the lower metal rubber and the upper metal rubber. Therefore, the above-mentioned metal vibration isolation device can realize automatic adjustment of the vibration isolation stiffness by controlling the clamp by the driving motor according to the requirements of vibration isolation stiffness in different stages such as ground testing, launch stage, and on-orbit. There is no need to remove the vibration isolation object or disassemble the vibration isolation device. The adjustment range can reach 2 to 4 times, and the in-situ adjustment of the stiffness is realized without disassembling the vibration isolation object and the vibration isolation device.

[0032] (2) The metal vibration isolation device of the present invention is provided with at least one ball-and-socket washer and a spherical washer between the adjusting screw and the first ear piece. The ball-and-socket washer is provided with a spherical hole, and the aperture of the spherical hole gradually decreases in the direction from the first ear piece toward the second ear piece. The outer peripheral surface of the spherical washer is a spherical surface that matches the shape of the spherical hole. The combined ball-and-socket washer and the spherical washer are used as adjustment washers for the adjusting screw, which can adapt to the changes in the relative angles of the two ears when the clamp is in different locking degrees, thereby avoiding lateral loads or bending moments on the adjusting screw.

[0033] (3) Since an adjusting gasket can be installed on the adjusting screw between the first ear piece and the second ear piece, and the adjusting gasket is provided with a second opening in the circumferential direction, the adjusting gasket can be directly installed on the adjusting screw through the second opening. Therefore, the adjusting gasket can be placed between the ear pieces from the outside through the second opening to avoid the adjusting screw, which has the characteristics of convenient installation and adjustment. At the same time, the circumference of the lower metal rubber and the upper metal rubber surrounded by the clamp can be adjusted by adjusting the number and thickness of the gaskets.

[0034] (4) Since the second ear piece is provided with a third through hole, an ear plate is provided on the outer peripheral surface of the shell, and the third through hole is provided on the ear plate, the clamp is fixedly connected to the ear plate by threading the fixing screw with the second threaded hole of the second ear piece, so that the clamp is fixedly connected to the shell. Therefore, the clamp is connected to the shell as a whole, which can prevent the clamp from being misplaced in a vibration environment.

[0035] (5) The metal vibration isolation device of the present invention can be completely made of metal materials, has stronger adaptability to the space environment, can be directly exposed to the space environment, and has a long on-orbit service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the metal vibration isolation device of the present invention;

[0037] Figure 2 It is a schematic diagram of the explosion structure of the metal vibration isolation device of the present invention;

[0038] Figure 3 for Figure 1 Sectional view of section AA;

[0039] Figure 4 It is a structural schematic diagram showing that the clamp is in an unlocked state;

[0040] Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure of part B;

[0041] Figure 6 It is a structural schematic diagram of the clamp in a locked state.

[0042] Among them, 1-base, 2-lower metal rubber, 3-sleeve, 4-upper metal rubber, 5-clamp, 6-fixing screw, 7-adjusting screw, 8-ball washer, 9-spherical washer, 10-housing, 11-connecting rod, 12-driving motor, 13-first ear piece, 14-second ear piece, 15-ear plate, 16-first opening, 17-annular baffle, 18-first threaded hole, 19-second threaded hole DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0044] The embodiment of the present invention provides a metal vibration isolation device with adjustable stiffness, such as Figure 1 and Figure 2 As shown in the structure, the metal vibration isolation device includes a base 1, a housing 10, a sleeve 3, an upper metal rubber 4, a lower metal rubber 2, a clamp 5, an adjustment screw 7, a connecting rod 11 and a driving motor 12;

[0045] The base 1 is the foundation of the entire metal vibration isolation device and can be made of a metal plate;

[0046] The top surface of the shell 10 is provided with a first through hole, the side surface is provided with a first opening 16, and the bottom is fixedly connected to the top surface of the base 1; the shell 10 is fixedly connected to the base 1, and a cavity is formed between the shell 10 and the base 1 for accommodating the sleeve 3, the upper metal rubber 4, the lower metal rubber 2 and the clamp 5; the shell 10 can be a cap-shaped structure; the first through hole provided on the top surface is used to pass the sleeve 3, so that the top of the sleeve 3 extends out of the outside of the shell 10, providing the sleeve 3 with a degree of freedom in the height direction; the first opening 16 provided on the side surface is used to make the connecting part of the clamp 5 extend out of the outside of the shell 10, so as to make a connection on the outside of the shell 10;

[0047] The sleeve 3 has a bottom end accommodated in a cavity between the base 1 and the shell 10, and a top end extending out of the shell through a first through hole, and an annular baffle 17 having an outer diameter greater than the aperture of the first through hole is provided on the outer peripheral surface in the cavity; there is a gap between the bottom end of the sleeve 3 and the top surface of the base 1; the outer diameter of the annular baffle 17 is greater than the aperture of the first through hole, and is used to prevent the sleeve 3 from escaping from the shell 10 from the first through hole; the outer diameter of the annular baffle 17 is smaller than the inner diameter of the cavity, and smaller than the outer diameters of the upper metal rubber 4 and the lower metal rubber 2, so as to prevent the clamp 5 from being restricted by the annular baffle and being unable to compress the upper metal rubber 4 and the lower metal rubber 2 in the radial direction; an annular gap is formed between the annular baffle and the shell 10, and the annular gap is used to accommodate the clamp 5;

[0048] like Figure 3As shown in the structure, the upper metal rubber 4 and the lower metal rubber 2 are both annular structures and are sleeved on the outer peripheral side of the sleeve 3; along the height direction, the upper metal rubber 4 and the lower metal rubber 2 are separated by an annular baffle on the outer peripheral side of the sleeve 3; the upper metal rubber 4 is located on the upper side of the annular baffle, and the lower metal rubber 2 is located on the lower side of the annular baffle;

[0049] The clamp 5 is sleeved on the outer peripheral side of the upper metal rubber 4 and the lower metal rubber 2, and a first ear piece 13 and a second ear piece 14 extending out of the housing through a first opening are provided at the joint; there is a distance between the first ear piece 13 and the second ear piece 14; the clamp 5 comprises an annular body with a notch, the first ear piece 13 is provided at one end of the notch of the annular body, and the second ear piece 14 is provided at the other end, and the first ear piece 13 and the second ear piece 14 are clamped by adjusting bolts, so that the annular body of the clamp 5 forms a closed loop; the clamp 5 can be made of metal materials such as 60Si2Mn, 65Mn, etc.; Figure 3 As shown in the structure, along the vertical direction, the height of the clamp 5 is less than the height of the cavity between the housing 10 and the base 1, the height of the clamp 5 is greater than the sum of the heights of the annular baffle 17 and the upper metal rubber 4, the height of the clamp 5 is also greater than the sum of the heights of the annular baffle 17 and the lower metal rubber 2, and the height of the clamp 5 is less than the sum of the heights of the annular baffle 17, the upper metal rubber 4 and the lower metal rubber 2, so that the clamp 5 can be simultaneously covered on the outer peripheral sides of the annular baffle 17, the upper metal rubber 4 and the lower metal rubber 2;

[0050] One end of the adjusting screw 7 passes through the first ear piece 13 and is threadedly connected to the second ear piece 14, and the other end is fixedly connected to the driving motor 12 through the connecting rod 11; the first ear piece 13 is provided with a second through hole for passing the adjusting screw 7; the second ear piece 14 is provided with a first threaded hole 18 corresponding to the second through hole; the adjusting screw 7 passes through the second through hole and is threadedly connected to the first threaded hole 18, so that the first ear piece 13 and the second ear piece 14 are clamped and connected together; the two ends of the connecting rod 11 can be welded to the adjusting screw 7 and the output shaft of the driving motor 12, or made into an integral structure;

[0051] The driving motor 12 is used to drive the adjusting screw 7 to rotate, and controls the screwing depth of the adjusting screw 7 to adjust the distance between the first ear piece 13 and the second ear piece 14, so as to achieve stiffness adjustment by changing the radial compression amount of the lower metal rubber 2 and the upper metal rubber 4.

[0052] The above-mentioned metal vibration isolation device has a sleeve 3 placed in the cavity between the base 1 and the shell 10, and an annular baffle is arranged on the outer peripheral surface of the sleeve 3 in the cavity, an upper metal rubber 4 is installed on the upper side of the annular baffle, and a lower metal rubber 2 is installed on the lower side, and a clamp 5 is sleeved on the outer peripheral side of the upper metal rubber 4 and the lower metal rubber 2, and the clamp 5 is provided with a first ear piece 13 and a second ear piece 14 extending out of the shell at the joint, one end of the adjusting screw 7 passes through the first ear piece 13 and is threadedly connected to the second ear piece 14, and the other end is fixedly connected to the driving motor 12 through the connecting rod 11, and the driving motor 12 drives the adjusting screw 7 to rotate to control its screwing depth, and the first ear piece 13 and the second ear piece 14 are adjusted by adjusting the first ear piece 13 and the second ear piece 14. The distance between them is adjusted to change the radial compression of the lower metal rubber 2 and the upper metal rubber 4 to achieve stiffness adjustment; since the screwing depth of the adjusting screw 7 is controlled by the driving motor 12, the distance between the first ear piece 13 and the second ear piece 14 can be adjusted, and the radial compression of the lower metal rubber 2 and the upper metal rubber 4 is controlled to achieve stiffness adjustment. Therefore, the above-mentioned metal vibration isolation device can realize automatic adjustment of the vibration isolation stiffness by controlling the clamp 5 through the driving motor 12 according to the requirements of vibration isolation stiffness in different stages such as ground testing, launching stage, and on-orbit. There is no need to remove the vibration isolation object or disassemble the vibration isolation device. The adjustment range can reach 2 to 4 times, and the in-situ adjustment of the stiffness is realized without disassembling.

[0053] In a specific implementation manner, Figure 4 , Figure 5 and Figure 6 As shown in the structure, at least one ball-and-socket washer 8 and a spherical washer 9 are arranged between the adjusting screw 7 and the first ear piece 13; the ball-and-socket washer 8 is provided with a spherical hole, and the aperture of the spherical hole gradually decreases in the direction from the first ear piece 13 to the second ear piece 14; the outer peripheral surface of the spherical washer 9 is a spherical surface that matches the shape of the spherical hole, and the outer diameter of the spherical surface gradually decreases in the direction from the first ear piece 13 to the second ear piece 14; the spherical washer 9 is sleeved on the outer peripheral side of the adjusting screw 7, and the ball-and-socket washer 8 is sleeved on the outer peripheral side of the spherical washer 9. The above-mentioned metal vibration isolation device also includes an adjusting washer (not shown in the figure) installed on the adjusting screw 7 between the first ear piece 13 and the second ear piece 14; the adjusting washer is provided with a second opening in the circumferential direction for being installed on the adjusting screw 7 through the second opening.

[0054] The above-mentioned metal vibration isolation device is provided with at least one ball and socket washer 8 and spherical washer 9 between the adjusting screw 7 and the first ear piece 13. The ball and socket washer 8 is provided with a spherical hole, and the aperture of the spherical hole gradually decreases in the direction from the first ear piece 13 toward the second ear piece 14. The outer peripheral surface of the spherical washer 9 is a spherical surface that matches the shape of the spherical hole. The combined ball and socket washer 8 and spherical washer 9 are used as adjustment gaskets for the adjusting screw 7, which can adapt to the changes in the relative angles of the two ears when the clamp 5 is in different locking degrees, thereby avoiding lateral loads or bending moments on the adjusting screw 7.

[0055] Since an adjusting gasket can be installed on the adjusting screw 7 between the first ear piece 13 and the second ear piece 14, and the adjusting gasket is provided with a second opening in the circumferential direction, the adjusting gasket can be directly installed on the adjusting screw 7 through the second opening. Therefore, the adjusting gasket can be put between the ear pieces from the outside through the second opening and avoid the adjusting screw 7, which has the characteristics of convenient installation and adjustment. At the same time, the circumference of the lower metal rubber 2 and the upper metal rubber 4 surrounded by the clamp can be adjusted by adjusting the number and thickness of the gaskets.

[0056] Furthermore, the above-mentioned metal vibration isolation device also includes a fixing screw 6; the second ear piece 14 is provided with a second threaded hole 19; the outer peripheral surface of the outer shell 10 is provided with an ear plate 15 corresponding to the position of the second ear piece 14, and the ear plate 15 is provided with a third through hole corresponding one to one with the second threaded hole 19; one end of the fixing screw 6 passes through the third through hole and is threadedly connected to the second threaded hole 19, so as to fix the clamp 5 to the outer shell 10 to prevent dislocation in a vibration environment.

[0057] Since the second ear piece 14 is provided with a second threaded hole 19, the outer peripheral surface of the shell 10 is provided with an ear plate 15, and a third through hole corresponding to the position of the second threaded hole 19 is provided on the ear plate 15, the second ear piece 14 is fixedly connected to the ear plate 15 by the fixing screw 6, so that the clamp 5 is fixedly connected to the shell 10, therefore, the clamp 5 is connected to the shell 10 as a whole, which can prevent the clamp 5 from being misplaced in a vibration environment.

[0058] All components of the above-mentioned metal vibration isolation device can be made of metal materials, which have stronger adaptability to the space environment, can be directly exposed to the space environment, and have a long on-orbit service life.

[0059] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal vibration isolation device with adjustable stiffness, characterized in that: include: Base; The housing has a first through hole on the top surface, a first opening on the side surface, and a bottom fixedly connected to the top surface of the base; A sleeve, the bottom end of which is accommodated in the cavity between the base and the shell, the top end of which extends out of the shell through the first through hole, and an annular baffle having an outer diameter larger than the aperture of the first through hole is provided on the outer peripheral surface in the cavity; The upper metal rubber is an annular structure, located on the upper side of the annular baffle, and sleeved on the outer peripheral side of the sleeve; The lower metal rubber is an annular structure, is located at the lower side of the annular baffle, and is sleeved on the outer peripheral side of the sleeve; A clamp is sleeved on the outer peripheral sides of the upper metal rubber and the lower metal rubber, and is provided with a first ear piece and a second ear piece extending out of the housing through the first opening at the joint; there is a distance between the first ear piece and the second ear piece; An adjusting screw, one end of which passes through the first ear piece and is threadedly connected to the second ear piece, and the other end of which is fixedly connected to the driving motor through a connecting rod; A driving motor, used for driving the adjusting screw to rotate, controlling the screwing depth of the adjusting screw to adjust the distance between the first ear piece and the second ear piece, thereby achieving stiffness adjustment by changing the radial compression amount of the lower metal rubber and the upper metal rubber; Also included is an adjustment washer mounted on the adjustment screw between the first ear piece and the second ear piece; The adjusting washer is provided with a second opening in the circumferential direction, and is used for being installed on the adjusting screw through the second opening.

2. The metal vibration isolation device according to claim 1, characterized in that: At least one ball and socket washer and a spherical washer are provided between the adjusting screw and the first ear piece; The ball and socket washer is provided with a spherical hole, the aperture of which gradually decreases in a direction from the first ear piece toward the second ear piece; The outer peripheral surface of the spherical washer is a spherical surface that matches the shape of the spherical hole, and the outer diameter of the spherical surface gradually decreases in the direction from the first ear piece to the second ear piece; The spherical washer is sleeved on the outer peripheral side of the adjusting screw, and the ball socket washer is sleeved on the outer peripheral side of the spherical washer.

3. The metal vibration isolation device according to claim 1, characterized in that: Also included are fixing screws; The first ear piece is provided with a second through hole for passing the adjusting screw; The second ear piece is provided with a first threaded hole and a second threaded hole; the first threaded hole corresponds to the second through hole one by one; The adjusting screw passes through the second through hole and is threadedly connected with the first threaded hole; The outer circumferential surface of the housing is provided with an ear plate corresponding to the position of the second ear piece, and the ear plate is provided with third through holes corresponding one-to-one to the second threaded holes; One end of the fixing screw passes through the third through hole and is threadedly connected to the second threaded hole, so as to fix the clamp to the housing to prevent dislocation in a vibration environment.

4. The metal vibration isolation device according to any one of claims 1 to 3, characterized in that: The clamp is made of 60Si2Mn or 65Mn material.

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