Vibration isolation device

Abstract

The invention discloses a vibration isolation device which comprises an elastic unit and a damping unit. The elastic unit comprises a plurality of elastic parts, the elastic parts are coaxially arranged and sequentially connected, and the elastic parts can get close to or get away from one another in the axial direction to block transmission of high-frequency micro-vibration; the damping unit comprises a damping piece and an inner column, the damping piece and the inner column are coaxially arranged in the elastic unit, and the damping piece is connected to the inner column in a sleeving mode; the inner column is fixedly connected to one elastic part in the elastic unit, a protrusion is arranged on the inner column in the radial direction, and a gap is formed between the protrusion and the damping piece in the axial direction. During high-frequency micro-vibration, the amplitude of the vibration is smaller than the width of the gap, the bulge of the inner column is not in contact with the damping piece, and the elastic unit provides elastic support and isolates the high-frequency micro-vibration; during low-frequency vibration, the vibration amplitude is larger than the width of the gap, the protrusions of the inner column make contact with and trigger the damping piece, and the damping piece generates damping force to restrain low-frequency vibration.

Description

Technical Field

[0001] This application relates to the field of spacecraft vibration isolation technology, specifically to a vibration isolation device. Background Technology

[0002] During launch, satellites are subjected to low-frequency, high-amplitude vibrations transmitted by the launch vehicle, which can easily cause resonance in the satellite payload and lead to damage to internal precision components. During operation in orbit, satellites mainly face high-frequency, low-amplitude micro-vibrations generated by the operation of the solar array drive mechanism, attitude control engine, etc. At this time, vibration isolation devices are needed to provide good high-frequency vibration isolation capabilities to reduce the transmission of vibration to precision components such as cameras.

[0003] Currently, most common satellite vibration isolation devices adopt a "spring + fixed damping" structure. While the damping can effectively suppress low-frequency resonance, it also significantly reduces the insertion loss capability of high-frequency vibration isolation, leading to an increase in the high-frequency micro-vibration transmissibility, which is not conducive to micro-vibration isolation. If only a pure spring structure is used, although good high-frequency vibration isolation performance can be obtained, the amplitude cannot be effectively controlled under low-frequency resonance conditions, making it difficult to meet the protection requirements during the launch phase. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a vibration isolation device that has a low peak transmissivity when dealing with low-frequency resonance and high vibration isolation efficiency when dealing with high-frequency micro-vibrations.

[0005] According to an embodiment of this application, the vibration isolation device includes an elastic unit, which includes multiple elastic parts coaxially arranged and connected in sequence. The multiple elastic parts can move closer or further apart from each other in the axial direction to block the transmission of high-frequency micro-vibrations. The damping unit includes a damping element and an inner column, both of which are coaxially arranged within the elastic unit. The damping element is sleeved on the inner column. The inner column is fixedly connected to one of the elastic parts in the elastic unit. The inner column has a protrusion arranged radially, and there is an axial gap between the protrusion and the damping element. When the inner column is subjected to low-frequency vibration, the inner column can slide relative to the damping element and contact the damping element to suppress the low-frequency vibration.

[0006] According to an embodiment of this application, the elastic unit includes a cavity that extends through the axial center of a plurality of elastic parts, and the damping unit is nested in the cavity.

[0007] According to an embodiment of this application, the damping unit includes a limiting sleeve, which is disposed in the cavity and fixedly connected to an elastic part of the elastic unit. The elastic part fixedly connected to the limiting sleeve is different from the elastic part fixedly connected to the inner column. The damping element is fixed inside the limiting sleeve, and the inner column passes through the limiting sleeve and is coaxially arranged with it.

[0008] According to an embodiment of this application, the limiting sleeve has a groove along its circumference, and the groove connects the inside and outside of the limiting sleeve along its radial direction. Multiple grooves are provided, and the multiple grooves are arranged at intervals along the axial direction of the limiting sleeve.

[0009] According to an embodiment of this application, the inner column is fixedly connected to the elastic part located at one axially upward end of the elastic unit, and the limiting sleeve is fixedly connected to the elastic part located at the other axially upward end of the elastic unit.

[0010] According to an embodiment of this application, the outer diameter of the limiting sleeve does not exceed 2 / 3 of the inner diameter of the elastic unit.

[0011] According to an embodiment of this application, the damping member includes a first damping member and a second damping member, which are arranged at intervals. The first damping member is located on one side of the axial direction of the protrusion, and the second damping member is located on the other side of the axial direction of the protrusion. There is an axial gap between the first damping member and the protrusion, and there is an axial gap between the second damping member and the protrusion.

[0012] According to an embodiment of this application, the damping element is formed of metal rubber, the elastic unit is made of titanium alloy, and the inner column is made of aluminum alloy.

[0013] According to an embodiment of this application, the width of the gap is in the range of 0.1 mm to 10 mm, and a shim is provided at one end of the damping member in the axial direction. The shim is used to adjust the width of the gap.

[0014] According to an embodiment of this application, a first mounting unit and a second mounting unit are included. The first mounting unit is fixedly connected to one end of the elastic unit along the axial direction, and the second mounting unit is fixedly connected to the other end of the elastic unit along the axial direction. The vibration isolation device can be installed on an external device through the first mounting unit and the second mounting unit.

[0015] The vibration isolation device according to the embodiments of this application has at least the following beneficial effects: When the vibration isolation device encounters high-frequency micro-vibration, the amplitude of the vibration is less than the width of the gap, and the inner column moves together with the elastic part. Due to the small amplitude, the protrusion of the inner column does not contact the damping element, and the damping element is in an idle state. At this time, the elastic unit provides elastic support for the vibration isolation device and realizes the isolation of the high-frequency micro-vibration. When the vibration isolation device encounters low-frequency vibration, the amplitude of the vibration is greater than the width of the gap, and the protrusion of the inner column contacts the damping element. At this time, the damping element is triggered and generates damping force to suppress the low-frequency vibration. Therefore, the vibration isolation device of this application has a low peak transmissibility when dealing with low-frequency resonance and high vibration isolation efficiency when dealing with high-frequency micro-vibration.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is a schematic diagram of the vibration isolation device according to an embodiment of this application; Figure 2 for Figure 1 A cross-sectional view of the vibration isolation device taken from section line AA; Figure 3 for Figure 2 Enlarged schematic diagram of section B of the structure; Figure 4 This is a schematic diagram of the vibration isolation device and the control torque gyroscope after assembly.

[0019] Figure label: 1000. Vibration isolation device; 100, Elastic unit; 110, Elastic part; 120, Cavity; 200, Damping unit; 201, Gap; 210, Damping component; 211, First damping component; 212, Second damping component; 220, Inner column; 221, Protrusion; 222, Limiting block; 230, Limiting sleeve; 300, First mounting unit; 310, First connecting bracket; 320, First mounting plate; 330, Inner column limiting plate; 331, Positioning groove; 400, Second mounting unit; 410, Second connecting bracket; 411, Positioning frustum; 420, Second mounting plate; 2000, Control Torque Gyroscope. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0024] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] This application provides a vibration isolation device 1000, which has a low peak transmissivity when dealing with low-frequency resonance and high vibration isolation efficiency when dealing with high-frequency micro-vibrations.

[0026] Please see Figure 1 and Figure 2 This application provides a vibration isolation device 1000, which includes a first mounting unit 300, a second mounting unit 400, and an elastic unit 100 and a damping unit 200 disposed between the two. It is understood that the vibration isolation device 1000 is connected to external equipment through the first mounting unit 300 and the second mounting unit 400. The elastic unit 100 and the damping unit 200 work together to isolate the vibration of the external equipment. It is understood that... Figure 1 For example, the axial direction of the vibration isolation device 1000 of this application is consistent with the X-axis direction, and the X-axis arrow points from the bottom of the vibration isolation device 1000 to the top of the vibration isolation device 1000. That is, the first mounting unit 300 is at the top of the vibration isolation device 1000, and the second mounting unit 400 is at the bottom of the vibration isolation device 1000. The vibration isolation device 1000 is connected to the external equipment through the upper first mounting unit 300 and the lower second mounting unit 400 respectively, so as to cope with the vibration and impact of the external equipment under complex working conditions.

[0027] like Figure 1 and Figure 2As shown, the elastic unit 100 includes a plurality of elastic parts 110, which are coaxially arranged and connected in sequence. The plurality of elastic parts 110 can move closer or further away from each other in the axial direction to block the transmission of high-frequency micro-vibrations.

[0028] like Figure 2 and Figure 3 As shown, the damping unit 200 includes a damping element 210 and an inner column 220. The damping element 210 and the inner column 220 are coaxially arranged in the elastic unit 100. The damping element 210 has a sleeve hole, and the damping element 210 is sleeved on the inner column 220 through the sleeve hole. The inner column 220 can move relative to the damping element 210 with vibration. Specifically, the upper end of the inner column 220 is provided with an external thread. The first mounting unit 300 includes an inner column limiting plate 330 with a through hole in the center. The upper end of the inner column 220 passes through the through hole and is fastened to the inner column limiting plate 330 by the external thread. The inner column limiting plate 330 is fixedly connected to the upper end of the elastic unit 100 by the threaded connection. In this way, the upper end of the inner column 220 is fixedly connected to the elastic part 110 at the upper end of the elastic unit 100. When the vibration isolation device 1000 is vibrated, the inner column 220 can move axially together with the elastic part 110 at the upper end of the elastic unit 100.

[0029] In some embodiments, the inner column 220 is provided with a limiting block 222 in the radial direction, and the inner column limiting plate 330 is provided with a positioning groove 331. When the upper end of the inner column 220 passes through the through hole in the center of the inner column limiting plate 330, the limiting block 222 is embedded in the positioning groove 331 to achieve positioning between the inner column 220 and the inner column limiting plate 330.

[0030] Furthermore, the inner column 220 is provided with a protrusion 221 in the radial direction. The radial dimension of the protrusion 221 is larger than the radial dimension of the sleeve hole on the damping member 210. In addition, there is an axial gap 201 between the protrusion 221 and the damping member 210. The width of the gap 201 is d.

[0031] When the vibration isolation device 1000 encounters high-frequency micro-vibration, the amplitude of the high-frequency micro-vibration is less than the width d of the gap 201. The inner column 220 moves together with the elastic part 110 at the upper end of the elastic unit 100. Due to the small amplitude, the protrusion 221 of the inner column 220 does not contact the damping element 210, and the damping element 210 is in an idle state. At this time, the elastic unit 100 provides elastic support for the vibration isolation device 1000 and realizes isolation of the high-frequency micro-vibration. When the vibration isolation device 1000 encounters low-frequency vibration, the amplitude of the vibration is greater than the width d of the gap 201. The protrusion 221 of the inner column 220 contacts the damping element 210. The damping element 210 is formed of metal rubber and has nonlinear damping characteristics. It provides high damping force under large amplitude vibration. The damping element 210 generates interaction force. At this time, the damping element 210 is triggered and generates damping force. The damping element 210 has high load-bearing capacity and suppresses low-frequency vibration.

[0032] It is understood that the inner column 220 can also be fixedly connected to other elastic parts 110 of the elastic unit 100. As long as it is ensured that it forms a fixed connection with any elastic part 110 of the elastic unit 100, the synchronous axial movement of the inner column 220 and the elastic part 110 can be achieved. Preferably, the inner column 220 is fixedly connected to the elastic part 110 at one end of the elastic unit 100, which ensures the compact structure and ease of assembly. At the same time, it is also convenient to control the width of the gap 201 between the inner column 220 and the damping member 210, thereby precisely controlling the motion threshold when the damping member 210 is activated.

[0033] Furthermore, such as Figure 2 and Figure 3 As shown, the elastic unit 100 has a cavity 120 at its lower part, which passes through the axial center of several elastic parts 110. Correspondingly, the damping unit 200 includes a limiting sleeve 230, which is disposed in the cavity 120 and is fixedly connected to the elastic part 110 at the lower end of the elastic unit 100. The damping member 210 is fixed inside the limiting sleeve 230, and the inner column 220 passes through the limiting sleeve 230 and is coaxially disposed with it. In other words, when the vibration isolation device 1000 is subjected to vibration, the limiting sleeve 230 can move synchronously with the elastic part 110 at the lower end of the elastic unit 100, and the damping member 210 also moves synchronously accordingly. The inner column 220 is fixedly connected to the upper end of the elastic unit 100 and vibrates together with the upper elastic part 110. When the amplitude difference between the upper and lower ends of the elastic unit 100 exceeds the width d of the gap 201, the protrusion 221 of the inner column 220 contacts the damping member 210 and triggers the damping member 210, thereby achieving the effect of the damping member 210 suppressing low-frequency vibration.

[0034] Furthermore, the outer diameter of the limiting sleeve 230 does not exceed 2 / 3 of the radial dimension of the cavity 120, so as to reserve sufficient radial deformation space for the elastic unit 100 and prevent the limiting sleeve 230 from colliding or rubbing against the inner wall of the elastic unit 100.

[0035] In some embodiments, such as Figure 2 and Figure 3 As shown, the damping element 210 includes a first damping element 211 and a second damping element 212. The first damping element 211 and the second damping element 212 are arranged at intervals within the limiting sleeve 230. The first damping element 211 is located on the upper side of the protrusion 221 of the inner column 220, and the second damping element 212 is located on the lower side of the protrusion 221 of the inner column 220. Both the first damping element 211 and the second damping element 212 have an axial gap 201 between themselves and the protrusion 221. The width of the gap 201 is d.

[0036] In other words, when the vibration isolation device 1000 is subjected to low-frequency, large-amplitude vibrations in the vertical direction, if the displacement of the elastic part 110 at the upper end of the elastic unit 100 is greater than that at the lower end, the protrusion 221 of the inner column 220 moves downward and compresses the first damping member 211, thereby generating a damping force. Conversely, when the displacement of the elastic part 110 at the lower end of the elastic unit 100 is greater, the protrusion 221 of the inner column 220 moves upward and compresses the second damping member 212, thereby generating a damping force. This achieves the suppression of bidirectional vibration. The symmetrical arrangement of the damping member 210 not only improves the symmetry of the vibration response of the vibration isolation device 1000, but also avoids structural eccentricity caused by the vibration isolation device 1000 being subjected to force on one side.

[0037] Furthermore, the width d of the gap 201 is controlled within the range of 0.1mm to 10mm. A shim is provided between the upper end face of the first damping element 211 and the limiting sleeve 230, and a shim is provided between the lower end face of the second damping element 212 and the second mounting unit 400. The width d of the gap 201 can be adjusted by adjusting the thickness of the shims to match the amplitude threshold requirements of high-frequency micro-vibrations under different working conditions. This design ensures that during high-frequency small-amplitude vibrations, the damping element 210 is in an idle state, that is, the protrusion 221 of the inner column 220 remains in a non-contact state with the damping element 210, and the damping element 210 does not intervene in the operation of the vibration isolation device 1000, thereby maximizing the preservation of high-frequency vibration isolation performance; when low-frequency large-amplitude vibrations occur, the gap 201 closes rapidly, triggering the damping response.

[0038] Furthermore, such as Figure 1As shown, the elastic unit 100 is formed as a thin-walled cylindrical structure, and each elastic part 110 has multiple slots along the circumference. The slots in each elastic part 110 are symmetrical about the axial direction of the elastic unit 100, and each elastic part 110 has four slots. It can be understood that the number of slots in each elastic part 110, the wall thickness of the cylinder, the number of elastic parts 110, and the center angle corresponding to a single slot are all adjustable parameters. The design is optimized according to the load-bearing capacity and the target vibration isolation frequency requirements to achieve a matching relationship between structural stiffness and vibration isolation performance.

[0039] In some embodiments, the elastic element 100 may also be formed as a spring.

[0040] In some embodiments, the limiting sleeve 230 has circumferential slots, which connect the inside and outside of the limiting sleeve 230 radially. Multiple slots are provided, spaced apart axially on the limiting sleeve 230. In other words, the slotted structure on the limiting sleeve 230 improves the impact resistance of the vibration isolation device 1000. By providing multiple slots, the compliance of the vibration isolation device 1000 under impact is improved, while also reducing the transmission of transient loads. Furthermore, the geometric parameters of the slots, including slot width, slot depth, and the number of slot layers, can be optimized according to the characteristics of the impact load.

[0041] Of course, the limiting sleeve 230 can also be a high-rigidity slotted spring. Its slotted structure can effectively disperse stress concentration and reduce peak transmission force when subjected to impact load.

[0042] In some embodiments, such as Figure 1 and Figure 2 As shown, the first mounting unit 300 also includes a first connecting bracket 310 and a first mounting plate 320. From top to bottom, the first mounting plate 320 and the first connecting bracket 310 are fixedly connected by a threaded connection. The first connecting bracket 310 is fixedly connected to the inner column limiting plate 330 by a threaded connection. The first connecting bracket 310 is fixedly connected to the inner column limiting plate 330 and also fixedly connected to the upper end of the elastic unit 100. The second mounting unit 400 includes a second connecting bracket 410 and a second mounting plate 420. From bottom to top, the first mounting plate 320 and the first connecting bracket 310 are fixedly connected by a threaded connection. The second mounting plate 420 and the second connecting bracket 410 are fixedly connected by a threaded connection. The upper end of the second connecting bracket 410 is provided with a positioning frustum 411 protruding from the surface along the axial direction. The radial dimension of the positioning frustum 411 matches the inner diameter of the limiting sleeve 230 to achieve the positioning of the limiting sleeve 230. In addition, the second connecting bracket 410 is fixed to the bottom of the limiting sleeve 230 by a threaded connection. At the same time, the second connecting bracket 410 is also fixedly connected to the lower end face of the elastic unit 100 by a threaded connection.

[0043] It is understandable that the above-mentioned threaded connection fixing method involves opening threaded holes in the vibration isolation device 1000, and then using fastening components to fix each component together. The fastening components include bolts, nuts and matching washers.

[0044] The vibration isolation device 1000 of this application embodiment is described below using a micro-vibration isolation implementation scheme for a control torque gyroscope 2000 as an example.

[0045] Please see Figures 1 to 4 This scheme employs four vibration isolation devices 1000 as vibration isolation leg units in a combined configuration. The four vibration isolation devices 1000 share a first mounting plate 320 and a second mounting plate 420. The four vibration isolation devices 1000 are evenly spaced between the first mounting plate 320 and the second mounting plate 420. Six control moment gyroscopes 2000 are evenly spaced on the bottom side of the second mounting plate 420. It is understood that the number of vibration isolation devices 1000 can be other than three, depending on the installation structure and load-bearing capacity requirements, to achieve vibration isolation performance matching under different load conditions.

[0046] Since this embodiment is applied to artificial satellites, the first connecting bracket 310 and the second connecting bracket 410 are both made of 2A12T4 aviation aluminum alloy by forging and precision machining. The inner column 220 and the limiting sleeve 230 are also made of the same 2A12T4 aviation aluminum alloy. The elastic unit 100 is made of titanium alloy to provide the main support stiffness for the vibration isolation device 1000.

[0047] The working principle of the vibration isolation device 1000 in this scheme is as follows: When the satellite is in the launch phase or experiencing low-frequency, large-amplitude vibrations, the relative vibration amplitude generated by the vibration isolation device 1000 is relatively large. At this time, the protrusion 221 of the inner column 220 contacts and compresses the damping element 210, and the damping element 210 generates a significant damping force to consume vibration energy, thereby effectively suppressing the resonance peak of low-frequency, large-amplitude vibrations. When the satellite is in orbit and faces high-frequency, small-amplitude micro-vibrations, the relative vibration amplitude generated by the vibration isolation device 1000 is very small. The protrusion 221 of the inner column 220 moves within the gap 201 between itself and the first damping element 211 on the upper side and the gap 201 between itself and the second damping element 212 on the lower side, without contacting the damping element 210, so that the damping element 210 is in an idle state and does not provide damping force. At this time, the vibration isolation device 1000 is dominated by the elastic unit 100 to suppress high-frequency, small-amplitude vibrations.

[0048] When it is necessary to adjust the vibration isolation frequency of the vibration isolation device 1000, the size of the gap 201 between the protrusion 221 of the inner column 220 and the damping element 210 can be changed by adjusting the thickness of the shim, thereby adjusting the trigger threshold when the damping element 210 is activated; another method is to adjust the trigger threshold when the damping element 210 is activated by adjusting parameters that affect the stiffness of the elastic unit 100, such as the wall thickness, number of slots or slot angle of the elastic unit 100.

[0049] The parameter design process in this embodiment is as follows: In order to meet the requirements of the transmitting section, the fundamental frequency of the vibration isolation system is set to be... In this embodiment, four vibration isolation legs are connected in parallel to bear the load, with a total load mass of m, and each vibration isolation leg bears a mass of m / 4. The formula for calculating the equivalent stiffness of a single vibration isolation leg is as follows: .

[0050] Based on this stiffness parameter, the target fundamental frequency design can be achieved by controlling the wall thickness, number of slots, slot angle, and elastic modulus of the elastic element 100.

[0051] The vibration isolation efficiency of high-frequency micro-vibration is calculated using the classical transmissivity formula: .

[0052] in When entering the high-frequency vibration isolation region, the damping is in the idle state with ξ=0. When λ is greater than 5, the transmissibility T<0.042, corresponding to a micro-vibration isolation insertion loss rate greater than 95.8%, which meets the requirements for high-precision optical load micro-vibration control.

[0053] The damping check parameters during the launch phase are as follows: The launch phase amplitude is large, and the displacement of elastic element 100 exceeds the gap by 4.0 mm. Damping element 210 begins to intervene and provide damping force. The system's designed damping ratio is 0.2. Under this damping ratio condition, the resonant peak transmissibility of the vibration isolation system can be calculated using the following formula: .

[0054] Substituting the design damping ratio ξ=0.2, we get: .

[0055] The calculation results show that the resonance peak amplification factor of the vibration isolation system is approximately 2.55 times, while the maximum allowable amplification factor for the launch section in aerospace is 4 to 5 times, which meets the requirements for resonance suppression during the launch phase. This damping setting takes into account both the structural load-bearing capacity and resonance peak suppression performance, ensuring the vibration isolation stability under launch conditions.

[0056] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A vibration isolation device, characterized in that, include: An elastic unit, comprising multiple elastic parts, which are coaxially arranged and connected in sequence, and the multiple elastic parts can move closer or further apart from each other in the axial direction to block the transmission of high-frequency micro-vibrations; A damping unit, comprising a damping element and an inner column, wherein the damping element and the inner column are coaxially disposed within the elastic unit, and the damping element is sleeved on the inner column; The inner column is fixedly connected to one of the elastic parts of the elastic unit. The inner column has a protrusion in the radial direction and a gap in the axial direction between the protrusion and the damping element. When the inner column is subjected to low-frequency vibration, the inner column can slide relative to the damping element and contact the damping element to suppress the low-frequency vibration.

2. The vibration isolation device according to claim 1, characterized in that, The elastic unit includes a cavity that extends through the axial center of a plurality of elastic parts, and the damping unit is nested in the cavity.

3. The vibration isolation device according to claim 2, characterized in that, The damping unit includes a limiting sleeve, which is disposed in the cavity and fixedly connected to one of the elastic parts in the elastic unit. The elastic part fixedly connected to the limiting sleeve is different from the elastic part fixedly connected to the inner column. The damping element is fixed inside the limiting sleeve, and the inner column passes through the limiting sleeve and is coaxially arranged with it.

4. The vibration isolation device according to claim 3, characterized in that, The limiting sleeve has a circumferential groove, which connects the inside and outside of the limiting sleeve radially. Multiple grooves are provided, and the multiple grooves are located in... The limiting sleeves are arranged at intervals along the axial direction.

5. The vibration isolation device according to claim 3, characterized in that, The inner column is fixedly connected to the elastic part located at one axially upward end of the elastic unit, and the limiting sleeve is fixedly connected to the elastic part located at the other axially upward end of the elastic unit.

6. The vibration isolation device according to claim 3, characterized in that, The outer diameter of the limiting sleeve does not exceed 2 / 3 of the radial dimension of the cavity of the elastic unit.

7. The vibration isolation device according to claim 1, characterized in that, The damping element includes a first damping element and a second damping element, which are arranged at intervals. The first damping element is located on one side of the axial direction of the protrusion, and the second damping element is located on the other side of the axial direction of the protrusion. There is an axial gap between the first damping element and the protrusion, and there is an axial gap between the second damping element and the protrusion.

8. The vibration isolation device according to claim 1, characterized in that, The damping element is formed of metal rubber, the elastic unit is made of titanium alloy, and the inner column is made of aluminum alloy.

9. The vibration isolation device according to claim 1, characterized in that, The width of the gap is in the range of 0.1 mm to 10 mm, and the damping element has a shim at one end in the axial direction, the shim being used to adjust the width of the gap.

10. The vibration isolation device according to claim 1, characterized in that, It includes a first mounting unit and a second mounting unit. The first mounting unit is fixedly connected to one end of the elastic unit along the axial direction, and the second mounting unit is fixedly connected to the other end of the elastic unit along the axial direction. The vibration isolation device can be installed on an external device through the first mounting unit and the second mounting unit.

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