A vibration damper and vibration isolation device with adjustable elastic center

Abstract

This invention discloses a vibration damper and vibration isolation device with an adjustable elastic center. The vibration damper includes a housing, within which a cylindrical elastic body is disposed. The elastic body comprises a first elastic body and a second elastic body, which have different hardnesses. A spindle is provided at the upper part of the elastic body, and the lower part of the elastic body is disposed within a cylindrical groove in the housing. One of the spindle and the housing has an equipment mounting structure, and the other has a base mounting structure. The vibration isolation device includes the aforementioned vibration damper. One of the spindle and the housing is connected to the equipment, and the other is connected to the base. Adjusting the elastic center of the vibration isolation device is achieved by adjusting the position of the vibration damper within the entire vibration isolation device, which is achieved by rotating the vibration damper around its own axis of rotation. The advantages of this invention are: simple structure, strong interchangeability, and ease of installation, disassembly, and maintenance.

Description

Technical Field

[0001] This invention belongs to the field of vibration isolation technology for optoelectronic equipment and other precision equipment, specifically relating to a vibration damper and vibration isolation device with adjustable elastic center. Background Technology

[0002] Vibration isolation is an essential component in modern precision equipment. It protects sensitive components from external excitations, ensuring the structural integrity of the equipment and reducing the impact of external excitations on precision servo control, thus ensuring the equipment's tracking performance. In the initial design phase, a three-dimensional model is often used to determine the center of mass for selecting vibration dampers. To achieve optimal vibration isolation performance, the elastic center of the vibration isolation device composed of a series of dampers must coincide with the equipment's center of mass.

[0003] However, during equipment development, uncertainties in the center of gravity of purchased components or other unforeseen factors (such as cable routing) can cause deviations between the actual center of gravity and the initial design, resulting in suboptimal placement of the selected vibration dampers and their installation locations. The traditional approach is to add counterweights to the equipment to align its center of gravity with the elastic center of the vibration isolation device, thus achieving optimal performance. However, this method increases the overall weight of the equipment and also presents the problem of failure to add counterweights at certain locations (such as windows) under the optimal counterweight scheme. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration damper and vibration isolation device with an adjustable elastic center. This solution is reasonably designed, simple in structure, highly interchangeable, and suitable for mass production, thus solving the problem of the non-adjustable elastic center of existing vibration dampers.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An adjustable elastic center vibration damper includes a housing, inside which is a cylindrical elastic body. The elastic body includes a first elastic body and a second elastic body, which have different hardnesses. The upper part of the elastic body is provided with a spindle, and the lower part of the elastic body is provided in a cylindrical groove in the housing. One of the spindle and the housing is provided with an equipment mounting structure, and the other is provided with a base mounting structure.

[0007] Furthermore, the mandrel is inserted into the elastic body and connected to the preload plate, with a first elastic body and a second elastic body sandwiched between the mandrel and the preload plate.

[0008] Furthermore, the mandrel is inserted into and glued to the shaft hole of the first elastomer.

[0009] Furthermore, the mandrel is threadedly connected to the preload plate.

[0010] Furthermore, the lower shaft section of the mandrel and the center seat of the preload plate are both located within the shaft hole of the elastomer.

[0011] Furthermore, the first elastomer and the second elastomer are of equal height, and the volume of the first elastomer and the second elastomer each accounts for half of the total volume of the elastomer.

[0012] Furthermore, both the first elastomer and the second elastomer are made of rubber.

[0013] Furthermore, the first elastomer and the second elastomer are bonded together, and both the first elastomer and the second elastomer are bonded and fixed in the cylindrical groove of the outer shell.

[0014] Furthermore, the outer circumferential surfaces of the first elastic body and the second elastic body are both glued and fixed to the inner circumferential surface of the cylindrical groove of the outer shell.

[0015] Furthermore, the spindle is provided with an equipment mounting structure, and the outer casing is provided with a base mounting structure.

[0016] Furthermore, the equipment mounting structure is a screw hole, and the base mounting structure is a circular groove arranged circumferentially on the bottom edge of the outer shell.

[0017] An elastically adjustable vibration isolation device includes a device and a base, including at least one of the aforementioned dampers, one of a spindle and a housing connected to the device and the other connected to the base. Adjusting the elastic center of the vibration isolation device is achieved by adjusting the position of the damper in the entire vibration isolation device, which is achieved by rotating the damper about its own axis of rotation.

[0018] Furthermore, it includes four vibration dampers, which are circumferentially distributed in the front, rear, left and right directions.

[0019] The beneficial effects of this invention are as follows: By designing the vibration damper with its center of mass offset from its elastic center, the position of its elastic center within the entire vibration isolation device can be adjusted by rotating the eccentric vibration damper around its own axis of rotation before use. This eccentric vibration damper ensures that the elastic center of the entire vibration isolation device is closest to the equipment's center of mass, thereby optimizing the performance of the vibration isolation device. This invention also features a simple structure, high interchangeability, and ease of installation, disassembly, and maintenance.

[0020] The aforementioned main solution of the present invention and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed by the present invention; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding the solution of the present invention, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected by the present invention, and will not be exhaustively listed here. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the vibration damper of the present invention.

[0022] Figure 2 This is an isometric view of the vibration damper of the present invention.

[0023] Figure 3 This is an isometric view of the vibration isolation device of the present invention.

[0024] Figure 4 This is a schematic diagram of the elastic center adjustment of the vibration isolation device of the present invention.

[0025] Figure 5 This is a comparison diagram of the vibration modes of the damper after the two centers coincide.

[0026] Figure 6 This is a comparison diagram of the resonance of the vibration isolation device after the two centers coincide.

[0027] In the figure: 1-Mandrel, 2-First elastomer, 3-Second elastomer, 4-Preload plate, 5-Outer shell, 6-Equipment, 7-Base. Detailed Implementation

[0028] The following non-limiting examples are used to illustrate the present invention.

[0029] Example 1:

[0030] refer to Figure 1 , Figure 2 and Figure 5 As shown, a shock absorber with adjustable elastic center includes a spindle 1, an elastomer (including a first elastomer 2 and a second elastomer 3), a preload plate 4, and a housing 5.

[0031] The outer shell 5 includes a central cylinder and an outer bottom edge connected as one piece, with a reinforcing wing plate between the central cylinder and the bottom edge. The elastic body is disposed in a cylindrical groove in the central cylinder, and the central cylinder also has an inner edge to limit and support the lower part of the elastic body.

[0032] The elastomer inside the outer shell 5 is cylindrical and consists of two parts: a first elastomer 2 and a second elastomer 3. The first elastomer 2 and the second elastomer 3 have different hardnesses and the difference is significant. Because the two elastomers have different hardnesses but basically the same shape, the elastic center of the shock absorber deviates from the center of mass.

[0033] The mandrel 1 has a T-shaped cross-section. The upper plate of the mandrel 1 is located above the elastic body. The lower shaft section of the mandrel 1 passes through the first elastic body 2 and is threadedly connected to the preload plate 4. Simultaneously, the lower shaft section of the mandrel 1 is glued and fixed within the shaft hole of the first elastic body 2. The preload plate 4 is located below the elastic body. A raised center seat is provided at the center of the preload plate 4, which is also located within the shaft hole of the first elastic body 2 and threadedly connected to the lower shaft section of the mandrel 1. The first elastic body 2 and the second elastic body 3 are sandwiched between the mandrel 1 and the preload plate 4. This connection applies preload to both the first and second elastic bodies 2 and 3.

[0034] Both the first elastomer 2 and the second elastomer 3 are made of rubber. The first elastomer 2 and the second elastomer 3 are bonded together. The outer circumferential surfaces of the first elastomer 2 and the second elastomer 3 are bonded and fixed to the inner circumferential surface of the cylindrical groove of the outer shell 5, thereby realizing the installation and fixation of the elastomers.

[0035] The first elastic body 2 and the second elastic body 3 are of equal height, and the volume of the first elastic body 2 and the second elastic body 3 each account for half of the volume of the elastic body, that is, 50%. In this case, the vibration damper is most eccentric, and the elastic center of the vibration isolation device can be adjusted within a wider range.

[0036] The spindle 1 is equipped with a mounting structure, which consists of screw holes on the upper plate. The outer casing 5 is equipped with a base mounting structure, which consists of annular slots arranged circumferentially on the bottom edge of the outer casing 5. The position of the elastic center of the eccentric vibration damper within the entire vibration isolation device can be adjusted by rotating the eccentric vibration damper around its own axis of rotation.

[0037] This adjustable-center rubber vibration isolator has an appearance interface similar to conventional rubber vibration dampers, offering high interchangeability and ease of assembly. By adjusting the elastic center to be closest to the equipment's center of gravity, the equipment's vibration isolation performance can be improved without traditional counterweight methods, and even when there is no optimal counterweight position, thus enabling the equipment to achieve lightweight design, improved appearance, and excellent vibration isolation performance.

[0038] Figure 5 This paper compares the vibration damper's relevant mode shapes under two conditions: when the elastic center of the vibration isolation device deviates from the equipment's center of mass and when it does not. It can be seen that when the elastic center coincides with the center of mass, the number of vibration damper's relevant mode shapes decreases from 6 to 1, indicating an improvement in vibration isolation performance.

[0039] Example 2:

[0040] refer to Figures 1-6 As shown, a vibration isolation device with an adjustable elastic center includes a device 6 and a base 7, and includes at least one vibration damper of Embodiment 1. The spindle 1 is connected to the device 6 by screws and screw holes, and the housing 5 is connected to the base 7 by screws and annular slots.

[0041] When in use, the vibration damper spindle is threaded to the equipment, and the vibration damper housing is threaded to the base through four annular slots, thus connecting the equipment to the base via a set of vibration dampers. A set of vibration dampers consists of four dampers, which are circumferentially distributed in the front, rear, left, and right directions.

[0042] Adjusting the elastic center of the vibration isolation device is achieved by adjusting the position of the damper within the entire vibration isolation device, which is done by rotating the damper around its own axis of rotation.

[0043] Figure 4 This diagram illustrates the elastic eccentricity of a single vibration damper, thereby allowing the elastic center of the vibration isolation device to be adjusted. The elastic center of this vibration isolation device can be adjusted to multiple positions, bringing it closest to the equipment's center of gravity, thus maximizing vibration isolation performance. This results in lighter weight, improved appearance, and excellent vibration isolation performance for the entire device.

[0044] In actual assembly and adjustment, the center of elasticity is not easy to coincide with the center of mass; it can only be brought close to it. Figure 6 When the elastic center of the vibration isolation device is close to the center of mass of the equipment, the frequency range of the resonance zone of the vibration isolation device will be reduced, and the vibration isolation effect will be more ideal.

[0045] By rotating the eccentric damper around its own axis of rotation, the position of its elastic center in the entire vibration isolation device can be adjusted. Therefore, the elastic center of the vibration isolation device, which consists of a series of eccentric dampers, can also be adjusted. Thus, the elastic center of the vibration isolation device can be adjusted to be near the center of mass of the equipment, which can improve the vibration isolation effect of the vibration isolation device.

[0046] The foregoing basic examples and their further alternative examples of the present invention can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed by the present invention. In the present invention, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A shock absorber with an adjustable elastic center, comprising a housing (5), wherein a cylindrical elastic body is disposed within the housing (5), characterized in that: The elastic body includes a first elastic body (2) and a second elastic body (3). The first elastic body (2) and the second elastic body (3) have different hardnesses. The upper part of the elastic body is provided with a spindle (1), and the lower part of the elastic body is provided in the cylindrical groove of the outer shell (5). One of the spindle (1) and the outer shell (5) is provided with an equipment mounting structure, and the other is provided with a base mounting structure. The elastic center of the shock absorber is off-center from the center of mass.

2. The damper with adjustable elastic center according to claim 1, characterized in that: The mandrel (1) is inserted into the elastic body and connected to the preload plate (4). A first elastic body (2) and a second elastic body (3) are sandwiched between the mandrel (1) and the preload plate (4).

3. The damper with adjustable elastic center according to claim 2, characterized in that: The spindle (1) is inserted through and glued to the shaft hole of the first elastic body (2).

4. The damper with adjustable elastic center according to claim 1, characterized in that: The first elastomer (2) and the second elastomer (3) are of equal height, and the volume of the first elastomer (2) and the second elastomer (3) each accounts for half of the volume of the elastomer.

5. The damper with adjustable elastic center according to claim 1, characterized in that: Both the first elastomer (2) and the second elastomer (3) are made of rubber.

6. The damper with adjustable elastic center according to claim 1, 4 or 5, characterized in that: The first elastomer (2) and the second elastomer (3) are bonded together, and both the first elastomer (2) and the second elastomer (3) are bonded and fixed in the cylindrical groove of the outer shell (5).

7. The damper with adjustable elastic center according to claim 1, characterized in that: The spindle (1) is provided with an equipment mounting structure, and the outer shell (5) is provided with a base mounting structure.

8. The damper with adjustable elastic center according to claim 7, characterized in that: The device mounting structure is a screw hole, and the base mounting structure is a circular groove arranged circumferentially on the bottom edge of the outer shell (5).

9. A vibration isolation device with an adjustable elastic center, comprising a device (6) and a base (7), characterized in that: Includes at least one damper as described in any one of claims 1 to 8, one of the spindle (1) and the housing (5) being connected to the device (6) and the other being connected to the base (7), the elastic center of the vibration isolation device is adjusted by adjusting the position of the damper in the entire vibration isolation device, the position of the damper in the entire vibration isolation device is adjusted by rotating the damper about its own axis of rotation.

10. The vibration isolation device with adjustable elastic center according to claim 9, characterized in that: It includes four vibration dampers, which are circumferentially distributed in the front, rear, left and right directions.

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