Vibration-free device

Abstract

To provide a base isolation device capable of not only preventing a loading body from turning over and falling, but also suppressing liquid in a container from swinging and waving.SOLUTION: A base isolation device 1 comprises: a base plate member 10; an intermediate plate member 20 arranged thereupon; a loading plate member 30 arranged thereupon and mounted with a loading body; a rolling member 40 enabling the base plate member 10 and intermediate plate member 20, and the intermediate plate member 20 and loading plate member 30 to move relatively; and a plurality of elastic members 50, 60 coupled among those plate members 10, 20 and 30. The elastic members 50, 60 are coupled while extension / contraction directions B connecting center part-side first coupling points Oi and outer peripheral part-side second coupling points Oo of the respective plate members 10, 20 and 30 are made different from radial directions A from center points O of the respective plate members 10, 20 and 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration isolation device. [Background technology]

[0002] Seismic isolation devices are used to suppress general vibrations as well as earthquake motions. For example, they are used to suppress vibrations and prevent tipping over of small, expensive ceramic art and fine art objects, small, lightweight equipment, and tropical fish tanks.

[0003] Vibration isolation devices for small, lightweight loads apply the principles of rolling and sliding vibration isolation, and for example have a two-layer structure with rollers or balls placed between them to use rolling friction to reduce the acceleration of seismic motion and vibration.

[0004] For example, Patent Document 1 discloses a vibration isolation device intended for small, lightweight loads such as art and craft objects, which has a lower base plate and an upper base plate located on this base plate, and a middle plate that supports a spherical rotor in rotatable fashion by abutting it against the lower base plate and the upper base plate, and is arranged between the base plate and the base plate in a non-fixed manner so that it can slide freely, and the base plate and the base plate are biased by multiple elastic members such as coil springs or rubber springs so that the base plate returns to directly above the base plate.

[0005] In the vibration isolation device of Patent Document 1, multiple elastic members, for example, four coil springs, are connected between the base plate and the base plate at equal intervals of 90 degrees from the center of the base plate to return the base plate directly above the base plate. These coil springs are arranged radially from the center of the base plate, so that the expansion and contraction directions of the coil springs coincide with the radial direction in which the coil springs are attached. Therefore, when the base plate moves due to earthquake motion, the center of the base plate will move in one of the radial directions, and depending on the direction of the earthquake motion, resonance will occur at the natural frequency of the coil springs, and the vibrations may be amplified by the coil springs whose expansion and contraction directions coincide.

[0006] Therefore, Patent Document 2 discloses a vibration isolation device that suppresses the amplification of vibration by making the expansion and contraction directions of the coil springs different from the mounting direction. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-239907 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-87014 Summary of the Invention [Problem to be solved by the invention]

[0008] However, while all of the above-mentioned vibration isolation devices can prevent loads, such as containers or tanks, from tipping over or falling by suppressing acceleration caused by earthquake motions, liquids such as water contained in containers or tanks can become violently turbulent and spill out of the container or tank, and there is a demand for vibration isolation devices that can suppress such phenomena.

[0009] The present invention has been made in consideration of the problems and demands in the prior art, and aims to provide a vibration isolation device that can not only prevent loads from tipping over or falling, but also suppress the shaking and rippling of liquid inside a container. [Means for solving the problem]

[0010] In order to solve the above problems, the inventors considered seismic motion and vibration of the vibration isolation device and the swaying of the liquid inside the container, and after extensive research, they found that the liquid level rises on the side opposite to the direction of vibration such as seismic motion, causing rippling, and that resonance occurs with long-period vibrations. They found that suppressing resonance caused by long-period vibrations and vibration isolation in the opposite direction to the vibration direction are effective in suppressing rippling of the liquid inside the container, and thus completed the present invention. The specific configuration of the present invention based on this finding is as follows.

[0011] That is, the vibration isolation device of the present invention is A base plate member; disposed on the base plate member Circular an intermediate plate member; a load plate member disposed on the intermediate plate member and on which a load is placed; sliding or rolling members provided between the base plate member and the intermediate plate member and between the intermediate plate member and the load plate member to enable relative movement; a plurality of elastic members connected between the base plate member and the intermediate plate member and between the intermediate plate member and the load plate member; The elastic member is attached to the base plate member. and Each of the load plate members was established The first connection point on the central side, The intermediate plate member is provided on an inner peripheral portion thereof. Between the second connecting points, the base plate member, the intermediate plate member, and the load plate member are connected with a shift in the radial direction centered on the center point of each, and the expansion and contraction direction connecting the first connecting point and the second connecting point. death, a first seismic isolation mechanism is configured by the base plate member, the intermediate plate member provided on the base plate member so as to be relatively movable, and the elastic member connected between the base plate member and the intermediate plate member; a second seismic isolation mechanism is configured by the load plate member provided on the intermediate plate member so as to be relatively movable, and the elastic member connected between the intermediate plate member and the load plate member; The direction of expansion and contraction of the elastic member included in the first seismic isolation mechanism is different from the direction of expansion and contraction of the elastic member included in the second seismic isolation mechanism. It is characterized by:

[0012] The first connecting points on the central side are provided at three locations at 120 degree intervals on a concentric circle centered on the central point, ,before It is preferable that the second connection points are provided at three locations on a concentric circle centered on the central point, at 120-degree intervals and 60 degrees apart from the first connection points, and six of the elastic members are connected between each of the three first connection points and the three second connection points.

[0013] The first connecting points on the central side are provided at four locations at 90-degree intervals on a concentric circle centered on the central point, ,beforeThe second connecting points are provided at four locations on a concentric circle centered on the central point, at 90-degree intervals and 45 degrees apart from the first connecting points, and eight of the elastic members are provided between the four first connecting points and the four second connecting points. Connect It is preferable that the above-mentioned configuration is adopted.

[0015] It is preferable that the load on the loading plate member is less than 10 kg, the elastic member is made of a coil spring with a spring constant of 0.0015 to 0.0040 N / mm, and the connection point of the other end of the elastic member to the loading plate member is movable by 16 cm or more on the base plate member.

[0016] It is preferable that the load on the loading plate member is 10 kg or more and 50 kg or less, the elastic member is made of a coil spring with a spring constant of 0.0020 to 0.0060 N / mm, and the connection point of the other end of the elastic member to the loading plate member is movable by 20 cm or more on the base plate member.

[0017] It is preferable that any one of the vibration isolation devices described above is provided as one unit, and that one load can be placed on the load plate members of a plurality of the units. [Effects of the Invention]

[0018] The vibration isolation device of the present invention can not only prevent loads from tipping over or falling, but also suppress the shaking and rippling of liquid in a container. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1A is a schematic cross-sectional view of one embodiment of the vibration isolation device of the present invention, (a) is a schematic arrow view along the bb arrow in (a), and (c) is a schematic arrow view along the cc arrow in (a). [Figure 2] FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention in a vibration-isolated state. [Figure 3]10A is a schematic cross-sectional view of another embodiment of the present invention, and FIG. 10B is a schematic view taken along the arrow bb in FIG. [Figure 4] 1A is a schematic cross-sectional view of the present invention, and FIG. 1B is a schematic cross-sectional view of a conventional example, relating to the vibration isolation state. [Figure 5] 10A and 10B show the measurement results of response acceleration in a seismically isolated state, with (a) being a graph of an example of the present invention and (b) being a graph of a conventional example. [Figure 6] This is a graph showing the measurement results of the response acceleration in the seismic isolation state in response to the Hyogo Prefecture Offshore Earthquake. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings (FIGS. 1 to 6). The vibration isolation device 1 of the present invention is a device used to isolate loads such as small and lightweight equipment, and to suppress the swaying and rippling of liquid in containers containing liquid. The vibration isolation device 1 is suitable for isolating loads, for example, where the weight of a load per vibration isolation device 1 is 10 kg or less, and even the heaviest load is 50 kg or less. Note that by combining multiple vibration isolation devices 1 as a single unit, for example, four units, and using them at the four corners of a device, the device can be used to isolate loads of a size and weight corresponding to the number of units. In principle, the vibration isolation device of the present invention is not limited in any way to the weight or type of load.

[0021] The vibration isolation device 1 comprises a base plate member 10, an intermediate plate member 20 arranged on the base plate member 10, a load plate member 30 arranged on the intermediate plate member 20 and on which a load is placed, sliding or rolling members 40 arranged between the base plate member 10 and the intermediate plate member 20 and between the intermediate plate member 20 and the load plate member 30 to enable relative movement, and a plurality of elastic members 50, 60 connected between the base plate member 10 and the intermediate plate member 20 and between the intermediate plate member 20 and the load plate member 30. Furthermore, in the vibration isolation device 1, the elastic members 50, 60 are connected between the first connection points Oi, Oi1 on the central side of the base plate member 10, the intermediate plate member 20, and the loading plate member 30, respectively, and the second connection points Oo, Oo1 on the outer periphery side of each, with a shift in the radial direction A centered on the central point O of each of the base plate member 10, the intermediate plate member 20, and the loading plate member 30, and the direction (expansion / contraction direction) B connecting the first connection points Oi, Oi1 and the second connection points Oo, Oo1.

[0022] The vibration isolation device 1 of this embodiment is configured with a two-stage vibration isolation mechanism, for example, by providing one intermediate plate member 20 between the base plate member 10 and the load plate member 30, and including a first vibration isolation mechanism 1A having rolling members 40 and elastic members 50 between the base plate member 10 and the intermediate plate member 20, and a second vibration isolation mechanism 1B having rolling members 40 and elastic members 60 between the intermediate plate member 20 and the load plate member 30. Note that the intermediate plate member 20 is not limited to being configured with one plate member, and can also be configured with multiple plates.

[0023] As shown in Figure 1, the vibration isolation device 1 comprises a base plate member 10 on which the first vibration isolation mechanism 1A is placed on a floor surface or a stand, an intermediate plate member 20 that is capable of relative movement on the base plate member 10 via rolling members 40, and a plurality of elastic members 50 connected between the base plate member 10 and the intermediate plate member 20.

[0024] The base plate member 10 includes, for example, a disk-shaped lower plate 11, a cylindrical support portion 12 protruding upward from the center of the lower plate, and an annular outer frame portion 13 protruding upward from the outer periphery. The support portion 12 has three one-end connecting portions 51 provided at 120-degree intervals on the outer periphery as first connecting points Oi on the center side of the elastic member 50. The outer frame portion 13 protrudes upward from the outer periphery of the lower plate 11, thereby restricting the range of movement (movement range) of the intermediate plate member 20 moving on the lower plate 11 toward the outer periphery. Note that the outer frame portion 13 may be omitted, and the range of movement of the lower plate 11 may be larger than that of the intermediate plate member 20.

[0025] Furthermore, the range of movement of the intermediate plate member 20 on the inner periphery side is the area between the annular inner periphery and the support portion 12 of the lower plate 11, and the range of movement of the intermediate plate member 20 on the outer periphery side is restricted by the outer frame portion 13 of the lower plate 11, so the range of movement is restricted to the narrower range of either the outer periphery side or the inner periphery side.

[0026] The intermediate plate member 20 is disposed on the lower plate 11 of the base plate member 10 concentrically around the center point O of the base plate member 10. The intermediate plate member 20 includes a circular annular intermediate plate 21. The annular inner periphery of the intermediate plate 21 is provided with three other-end connecting portions 52 as second connecting points Oo on the outer periphery side of the elastic member 50, which are spaced 60 degrees apart from one-end connecting portions 51 of first connecting points Oi on the center side of the lower plate 11, at 120-degree intervals.

[0027] At least three rolling members 40 (six in the illustrated example) are provided at equal circumferential intervals on the lower surface 22 of the intermediate plate 21, protruding downward. Each rolling member 40 comprises a lower ball 41 that is a spherical rotating body, and a lower support frame 42 that supports the lower ball 41. The rolling members 40 enable relative movement of the intermediate plate 21 in any direction on the lower plate 11, and support the load of the load on the vibration isolation device 1. The number of rolling members 40 is not limited to six, and more than three rolling members 40 may be provided; the more rolling members there are, the more stable the load can be supported and the more stable the relative movement can be.

[0028] The elastic members 50 are connected between the base plate member 10 and the relatively movable intermediate plate member 20. The elastic members 50 are connected between three first connection points Oi on the center side provided on the support portion 12 of the base plate member 10 and three second connection points Oo on the inner peripheral side of the intermediate plate member 20, which are shifted by 60 degrees from the first connection points Oi, and two elastic members 50 are connected to each of the first connection points Oi and second connection points Oo, with one end connection portion 51 and the other end connection portion 52 of tension coil springs being connected to each of the first connection points Oi and second connection points Oo, for a total of six elastic members 50. In this way, the elastic members 50 made up of six tension coil springs are arranged so that the radial direction A passing through the center point O does not coincide with the expansion / contraction direction B connecting the first connecting point Oi on the central side where the one-end connecting portion 51 of each elastic member 50 is attached and the second connecting point Oo on the outer periphery side where the other-end connecting portion 52 is attached. Furthermore, the one-end connecting portion 51 or the other-end connecting portion 52 of two elastic members 50 are connected to each of the first connecting point Oi and each of the second connecting point Oo, and the two elastic members 50 are arranged evenly on both sides (positions symmetrical about the axis) of the radial direction A passing through each of the first connecting point Oi and each of the second connecting points Oo. As described above, the first stage vibration isolation mechanism 1A of the vibration isolation device 1 is constructed, and the intermediate plate member 20 rolls against the base plate member 10 via the rolling members 40 to provide vibration isolation, while the elastic member 50 in the expansion / contraction direction B, which is offset from the movement direction of the intermediate plate member 20 in the radial direction A, reduces acceleration while suppressing resonance, and returns the intermediate plate member 20 to its original position.

[0029] Furthermore, the vibration isolation device 1 includes a vibration isolation mechanism 1B on top of the vibration isolation mechanism 1A. In the vibration isolation mechanism 1B, a load plate member 30 is provided on an intermediate plate member 20 so as to be relatively movable, and a load is placed on the load plate member 30. An elastic member 60 is provided between the intermediate plate member 20 and the load plate member 30, and one end connecting portion 61 on the central side is connected to the load plate member 30, and the other end connecting portion 62 on the outer periphery side is connected to the intermediate plate member 20. In this way, in the vibration isolation device 1, the intermediate plate member 20 functions as a second-stage base plate that moves relatively to the load plate member 30, and functions as a vibration isolation mechanism 1B that isolates the load plate member 30 from vibrations.

[0030] In the vibration isolation mechanism 1B of the vibration isolation device 1, at least three (six in the illustrated example) rolling members 40 are provided on the upper surface 23 of the intermediate plate 21 of the intermediate plate member 20, protruding upward and spaced 120 degrees apart, offset by 60 degrees from the rolling members 40 on the lower surface 22. Like the rolling members 40 on the lower surface, each rolling member 40 includes an upper ball 43, which is a spherical rotating body, and an upper support frame 44 that supports the upper ball 43. By offsetting the lower ball 41 and lower support frame 42 on the lower surface 22 from the upper ball 43 and upper support frame 44 on the upper surface, the height of the intermediate plate member 20 can be reduced. The number of rolling members 40 is not limited to six, evenly spaced around the circumference of each of the upper and lower parts. More than three rolling members 40 may be provided. The more rolling members there are, the more stable the load can be supported and the relative movement can be achieved. In this case, it is preferable to offset the positions of the upper and lower rolling members 40.

[0031] The intermediate plate member 20 has three second connection points Oo1 at equal circumferential intervals on its annular inner periphery that connect the other end connection portion 62 on the outer periphery of the elastic member 60, and these are positioned midway, shifted by 60 degrees from the second connection point Oo that connects the other end connection portion 52 of the elastic member 50.

[0032] The load plate member 30 is placed on the intermediate plate member 20, and a load is placed on the load plate member 30. The load plate member 30 is movable in any direction relative to the intermediate plate member 20 via rolling members 40 on the upper surface 23 of the intermediate plate member 20. The load plate member 30 is equipped with a disk-shaped load plate 31, and an upper support column 32 is provided protruding from the lower surface of the center of the load plate 31. The upper support column 32 has three first connection points Oi1 on the center side, which are provided at equal intervals around the circumference and connect one end connection portion 61 of the elastic member 60. The first connection points Oi1 are located midway, offset by 60 degrees from the first connection point Oi of the upper support column 32.

[0033] The elastic members 60 are connected between three first connection points Oi1 on the center side of the load plate member 30, which is movable relative to the intermediate plate member 20, and three second connection points Oo1 on the annular inner peripheral side of the intermediate plate member 20. Two elastic members 60 are connected to each of the first connection points Oi1 and the second connection points Oo1, for a total of six elastic members 60, each of which is formed by connecting one end connection portion 61 and the other end connection portion 62 of a tension coil spring. In this way, the elastic members 60 made up of six tension coil springs are in a state in which the radial direction A passing through the center point O does not coincide with the expansion / contraction direction B connecting the first connecting point Oi1 on the central side where the one-end connecting portion 61 of each elastic member 60 is attached and the second connecting point Oo1 on the outer periphery side where the other-end connecting portion 62 is attached. Furthermore, the one-end connecting portion 61 or the other-end connecting portion 62 of two elastic members 60 are connected to each of the first connecting point Oi1 and each of the second connecting point Oo1, and the two elastic members 60 are arranged evenly on both sides (positions symmetrical about the axis) of the radial direction A passing through each of the first connecting point Oi1 and each of the second connecting points Oo1. As described above, the second stage vibration isolation mechanism 1B of the vibration isolation device 1 is constructed, and the loading plate member 30 performs rolling vibration isolation against the intermediate plate member 20 via the rolling members 40, and the elastic member 60 in the expansion / contraction direction B, which is shifted from the movement direction of the loading plate member 30 in the radial direction A, reduces acceleration while suppressing resonance, and returns the loading plate member 30 to its original position.

[0034] In the vibration isolation device 1, the intermediate plate member 20 is vibration-isolated by rolling against the base plate member 10 using the rolling members 40, and is returned to its original position by the elastic members 50, thereby achieving a first stage of vibration isolation; further, the loading plate member 30 is vibration-isolated by rolling against the intermediate plate member 20 using the rolling members 40, and is returned to its original position by the elastic members 60, thereby achieving a second stage of vibration isolation.

[0035] In the vibration isolation device 1, the two-stage vibration isolation mechanisms 1A and 1B are used to place the base plate member 10 on the floor or the like, and a container D (see Figure 4) filled with liquid is placed on the loading plate member 30 as a load.If, for example, earthquake motion acts in the +X direction (rightward in Figure 2) of the base plate member 10 as shown in Figure 2, the intermediate plate member 20 will move relatively in the -X direction (leftward in Figure 2), which is opposite to the earthquake motion, in response to the shaking and acceleration of the earthquake motion, thereby isolating the vibration and suppressing the shaking and acceleration. At the same time, the load plate member 30 is isolated from the vibration of the intermediate plate member 20 in the -X direction by moving relatively in the +X direction opposite to the vibration of the intermediate plate member 20, thereby suppressing the vibration.

[0036] In the vibration isolation device 1, seismic motion acts on the base plate member 10, and the amplitude and acceleration are suppressed by the intermediate plate member 20. However, in the vibration isolation mechanism 1B consisting of the intermediate plate member 20 and the loading plate member 30, the seismic motion applied to the intermediate plate member 20 is equivalent to the first-stage vibration isolation mechanism 1A suppressing the amplitude and acceleration, and acting as a reduced-acceleration vibration. If viewed as a vibration isolation device with only one stage (a vibration isolation device with only the second stage), it is sufficient to isolate seismic motion that has been suppressed to a small level, and it becomes possible for the vibration isolation device 1 to significantly suppress the amplitude and reduce the acceleration. With this two-stage vibration isolation effect, the amplitude and acceleration of large shaking caused by earthquake motion are reduced by the vibration isolation effect of the intermediate plate member 20, and the amplitude and acceleration of the loading plate member 30 are kept small relative to the reduced amplitude and acceleration, and the amplitude and acceleration received by the load are greatly reduced relative to the earthquake motion. As a result, in the container D (see Figure 4) containing liquid as load, the shaking and rippling of the water surface are greatly reduced, preventing the liquid from spilling from the container D.

[0037] In the vibration isolation device 1, during vibration isolation, elastic members 50, such as six tension coil springs, are connected between the base plate member 10 and the intermediate plate member 20, and the elastic members 50 hold the intermediate plate member 20 at the center point O of the base plate member 10 (return to the origin), absorb energy when subjected to vibration due to an earthquake, and reduce response acceleration. At the same time, elastic members 60, such as six tension coil springs, are connected between the intermediate plate member 20 and the loading plate member 30, and the elastic members 60 hold the loading plate member 30 at the center point O of the intermediate plate member 20 (return to the origin), absorb energy when subjected to vibration due to an earthquake, and reduce response acceleration.

[0038] In an experiment using the vibration isolation device 1, as shown in Figure 4(a), a glass container D with an inner diameter of 8.2 cm was filled with water 1 as liquid to a height of 10 cm, and vibrations equivalent to the earthquake waves from the Hyogo Prefecture Offshore Earthquake (measured at 5:46 a.m. on January 17, 1995, Nakayamate, Chuo Ward, Kobe) were applied using a shaking table. As a result, the change in the liquid level in the vibration isolation device 1 was 1 cm. In contrast, the change in the liquid level in the glass container D on the intermediate plate member 20, which corresponds to the case where only the single-stage vibration isolation mechanism 1A shown in Figure 4(b) is used, was 5 cm. This experiment confirmed that the vibration isolation device 1 provides a significant vibration isolation effect.

[0039] In the vibration isolation device 1, one end connecting portion 51 of the elastic member 50 is connected to first connecting points Oi on the central side spaced apart by 120 degrees in the first-stage vibration isolation mechanism 1A, and the other end connecting portion 52 of the elastic member 50 is connected to three second connecting points Oo on the outer periphery side spaced apart by 120 degrees and shifted 60 degrees from the first connecting point Oi. Furthermore, in the second-stage vibration isolation mechanism 1B, one end connecting portion 61 of the elastic member 60 is connected to first connecting point Oi1 on the central side spaced apart by 120 degrees, and the other end connecting portion 62 of the elastic member 60 is connected to three second connecting points Oo1 on the outer periphery side spaced apart by 120 degrees and shifted 60 degrees from the first connecting point Oi1. As a result, the direction connecting the one-end connecting portions 51, 61 and the other-end connecting portions 52, 62 of the elastic members 50, 60 is the expansion / contraction direction B, which is offset from the radial direction A centered on the center point O of the intermediate plate member 20 and the loading plate member 30. Therefore, the expansion / contraction direction B of each elastic member 50, 60 does not overlap with the radial direction A, preventing resonance. Even if seismic motion resonates with the natural frequency of the springs of the elastic members 50, 60, amplification of vibrations due to the elastic members 50, 60 can be prevented. The natural frequencies of the elastic members 50, 60 can also be addressed by avoiding resonance as much as possible in advance at the design stage. Furthermore, it is preferable that the expansion / contraction direction B of the elastic members 50 of the first-stage vibration isolation mechanism 1A be offset from the expansion / contraction direction B of the elastic members 60 of the second-stage vibration isolation mechanism 1B. By shifting the expansion and contraction direction B of the first-stage vibration isolation mechanism 1A from the expansion and contraction direction B of the second-stage vibration isolation mechanism 1B, resonance between the expansion and contraction directions B can be further suppressed.

[0040] Furthermore, because the expansion / contraction direction B of the elastic members 50, 60 is offset from the radial direction A centered on the center point O of the intermediate plate member 20 and the loading plate member 30, the expansion / contraction of the elastic members 50, 60 does not limit the range of motion of the intermediate plate member 20 and the loading plate member 30, ensuring a sufficient range of motion (the movement range of the intermediate plate member 20 and the loading plate member 30), thereby enabling the miniaturization of the vibration isolation device 1. Furthermore, by evenly arranging the elastic members 50, 60 on both sides of the radial direction A, the load of each elastic member 50, 60 can be dispersed rather than concentrated, which has the effect of suppressing damage due to concentrated loads. Furthermore, because the intermediate plate member 20 and the loading plate member 30 are connected by six elastic members 50 or six elastic members 60, respectively, twisting (rotation around the vertical axis) can be prevented, and rotation of the load on the loading plate member 30 around the vertical axis can be suppressed.

[0041] In such a vibration isolation device 1, in order to make the vibration isolation effect by the arrangement of the elastic members 50, 60 more effective, it is necessary to set the spring constant k to an appropriate value for the load of the load applied to the loading plate member 30. For example, in the case of the vibration isolation device 1, when six elastic members 50, 60 are provided and the load amount of the loading plate member 30 is set to less than 10 kg, it is preferable to set the spring constant k to 0.0015 or more and 0.0040 N / mm or less. Furthermore, when the load amount on the loading plate member 30 is set to 10 kg or more and 50 kg or less, it is preferable to set the spring constant k of the elastic members 50, 60 to 0.0020 or more and 0.0060 N / mm or less. Note that the spring constants k of the elastic members 50, 60 do not necessarily have to be the same, but in this embodiment, the same ones are used.

[0042] Furthermore, the movement distance (movable range) of the intermediate plate member 20 and the load plate member 30 connected by the elastic members 50, 60 is the range of movement of the intermediate plate member 20 on the base plate member 10 and the range of movement of the load plate member 30 on the intermediate plate member 20, but when the load is less than 10 kg, it is desirable to configure the intermediate plate member 20 connected by the elastic member 50 on the base plate member 10 so that it can move, for example, 16 cm or more (8 cm each way as it moves left and right). Also, when the load amount is 10 kg or more and 50 kg or less, it is desirable to configure the load plate member 30 connected by the elastic member 60 so that it can move 20 cm or more on the intermediate plate member 20 (10 cm each way as it moves left and right). When ensuring the movement distance of such intermediate plate member 20 and loading plate member 30, it is necessary to secure space for the elastic members 50, 60, which are compressed as they move. However, in the vibration isolation device 1, the expansion / contraction direction B of the elastic members 50, 60 is offset from the radial direction A in which the loading plate member 30 moves, so it is easy to secure space for the expansion / contraction of the elastic members 50, 60, and the vibration isolation device 1 can be made smaller.

[0043] Furthermore, in the vibration isolation device 1, vibrations are isolated by the rolling members 40 rolling in any direction on the lower plate 11 of the base plate member 10 and by the rolling members 40 rolling in any direction on the intermediate plate 21 of the intermediate plate member 20. Therefore, in order to ensure the vibration isolation effect, it is preferable to construct the base plate member 10 itself and the loading plate member 30 from low-friction materials, or to attach friction-reducing materials to the lower plate 11 and the underside of the loading plate 31 to reduce rolling friction and enable smooth rolling.

[0044] For example, acrylic resin materials and fluororesin materials such as PTFE (Polytetrafluoroethylene) are most preferable as friction reducing members because they have a low coefficient of friction, but polyethylene and other low-friction coefficient materials can also be used. Furthermore, even if the friction reducing members have a flat, planar shape, it is more preferable to provide them with irregularities so that the contact area with the lower plate 11 and the loading plate 31 is reduced relative to the total area of ​​the lower plate 11 and the loading plate 31. Furthermore, the friction reduction member is not limited to being attached in sheet form to the lower plate 11 or the like, but can also be formed by applying a coating of the above-mentioned material to the lower plate 11 or the like. In this case, if the friction between the friction reduction member and the rolling member 40 is too small, the rolling member 40 will slide instead of rolling, and the rolling effect will not be obtained, so there is an appropriate range of friction, and for example, it is preferable that the surface roughness (Ra) is 0.01 to 0.1 μm. Furthermore, the base plate member 10, etc., including the friction reduction member, must have a hardness that allows the rolling members 40 to roll smoothly even when a load is applied, and the surface hardness of the base plate member 10, etc., varies depending on the size of the spheres of the rolling members 40, but it is preferable that the Asker A hardness be 50 or more, for example.

[0045] In this embodiment, the lower plate 11 of the base plate member 10 and the load plate 31 of the load plate member 30 are themselves made of low-friction materials, allowing the lower balls 41 and upper balls 43 of the rolling members 40 to roll smoothly. In this case, the surface roughness of the low-friction materials is selected so that the lower balls 41 and upper balls 43 can roll without slipping. It is also possible to attach a friction reducing member to the lower plate 11 of the base plate member 10 or the loading plate 31 of the loading plate member 30 in order to reduce friction. Also, instead of the rolling members 40, sliding members may be provided on the lower surface 22 or upper surface 23 of the intermediate plate member 20 to provide so-called sliding vibration isolation. In this case, the intermediate plate member 20 itself may be made of a low-friction material, and the lower surface 22 or upper surface 23 may also serve as the sliding member.

[0046] The vibration isolation device 1 can be configured as a vibration isolation device comprising a plurality of units, each unit being made up of a base plate member 10, an intermediate plate member 20, a loading plate member 30, a rolling member 40 provided on the intermediate plate member 20, and elastic members 50, 60 arranged between them. In this vibration isolation device, one load is placed on the loading plate members 30 of the plurality of units. For example, if the load is large and rectangular, placing four units (seismic isolation devices 1) at the four corners of the load will enable the load to be stably supported and a sufficient vibration isolation effect to be obtained. Note that the number of units used as a vibration isolation device is not limited to four units, as long as it is two or more, and can be determined according to the projected area and weight of the load on a flat surface.

[0047] Next, another embodiment of the vibration isolation device will be described with reference to FIG. The vibration isolation device 2 is constructed by forming a base plate member 10A, an intermediate plate member 20A, and a loading plate member 30A into a rectangular shape, and the basic configuration other than the rectangular shape is the same as the circular vibration isolation device 1 already described. Below, we will mainly explain the configuration of the rolling member 40A and elastic members 50A and 60A, which are different. The rolling members 40A are provided with two lower balls 41A and two upper balls 43A on the lower surface and the upper surface of each side of the intermediate plate member 20A, totaling 16 balls. The elastic member 50A is composed of eight pieces, two at each of four locations equally spaced 90 degrees apart, between the base plate member 10A and the intermediate plate member 20A, and connects one end connecting portion 51A to the other end connecting portion 52A. Similar to the elastic member 50A, the elastic member 60A is arranged between the intermediate plate member 20A and the loading plate member 30A, and is composed of eight pieces, two at each of four locations equally spaced 90 degrees apart in the middle of the elastic member 50A (not shown), connecting one end connecting portion 61A to the other end connecting portion 62A.

[0048] In the vibration isolation device 2 configured in this manner, as with the vibration isolation device 1 already described, seismic motion acts on the base plate member 10A, and the amplitude and acceleration are suppressed by the intermediate plate member 20A. However, in the vibration isolation mechanism 1B consisting of the intermediate plate member 20A and the loading plate member 30A, the seismic motion applied to the intermediate plate member 20A is equivalent to the first-stage vibration isolation mechanism 1A suppressing the amplitude and acceleration, and acting as a seismic motion with reduced acceleration. If viewed as a vibration isolation device with only one stage (a vibration isolation device with only the second stage), it is sufficient to isolate seismic motion that has been suppressed to a small level, and it becomes possible for the vibration isolation device 2 to significantly suppress the amplitude and reduce the acceleration. With this two-stage vibration isolation effect, the vibration isolation effect of the intermediate plate member 20A reduces the amplitude and acceleration of large shaking caused by earthquake motion, and the amplitude and acceleration of the loading plate member 30A are kept small relative to the reduced amplitude and acceleration, significantly reducing the amplitude and acceleration experienced by the load due to the earthquake motion. As a result, in the container D containing liquid as load, the shaking and rippling of the water surface are significantly reduced, preventing the liquid from spilling from the container. In the vibration isolation device 2, the elastic members 50A, 60A are connected so that the expansion / contraction direction B of the elastic members 50A, 60A is offset from the radial direction A of the center point O of the intermediate plate member 20A, thereby preventing resonance. Furthermore, the expansion / contraction of the elastic members 50A, 60A is unlikely to limit the range of movement of the intermediate plate member 20A or the loading plate member 30A, making it easy to ensure the range of movement and enabling the miniaturization of the vibration isolation device 2. Furthermore, by arranging the elastic members 50A, 60A evenly on both sides of the radial direction A, the load is equalized, preventing damage and the like. [Example]

[0049] Examples of the vibration isolation device of the present invention will be described below together with comparative examples. [Example] The vibration isolation device 1 is composed of a 200 mm diameter synthetic resin disk as the base plate member 10, a ring-shaped intermediate plate member 20 with an outer diameter of 150 mm and an inner diameter of 100 mm, and a 200 mm diameter synthetic resin disk as the loading plate member 30. A total of 12 tension coil springs, six of which are 60 mm long and have a spring constant k of 0.0031 N / mm, are prepared as elastic members 50, 60, and are connected at one end connecting portions 51, 61 and the other end connecting portions 52, 62. Vibration test 1 The vibration isolation device 1 was fixed on the table of a biaxial vibration testing machine, and a weight of 1.6 kg (load amount) was placed on the loading plate member 30. An acceleration sensor was attached to the load plate member 30 . The input acceleration of the vibration table was set to 200 gal, and the frequency was varied from 8 to 1 Hz, and the response acceleration was measured using an acceleration sensor. The measurement results are shown in Figure 5(a). The vibration test results for this example showed that the response acceleration was equal to or less than the input acceleration, and almost no resonance was observed even at frequencies around 1 Hz. Vibration test 2 The vibration isolation device 1 was fixed on the table of a biaxial vibration testing machine, and a glass container D with an inner diameter of 8.2 cm was placed on the loading plate member 30, filled with water 1 to a height of 10 cm (load weight: 0.92 kg), as shown in Fig. 4(a). An acceleration sensor was attached to the load plate member 30 . The shaking equivalent to the earthquake waves from the Hyogo Prefecture offshore earthquake (measured at Nakayamate, Chuo-ku, Kobe, 5:46 a.m. on January 17, 1995) was applied using a shaking table, and the response acceleration was measured using an acceleration sensor. The measurement results are shown in FIG. From the vibration test results of this example, the response acceleration of the example was equal to or lower than the response acceleration of the comparative example, and resonance was suppressed.

[0050] [Comparative Example] A single-stage vibration isolation mechanism was created, which was the same as the embodiment except that a plate material was attached to the upper surface of the intermediate plate member 20 of the vibration isolation device 1, avoiding the rolling members 40, to serve as a temporary loading plate member. As shown in FIG. 5(b), the results of vibration test 1 for the comparative example showed that resonance occurred at a response acceleration of approximately 1 Hz, which was greater than the input acceleration. Furthermore, as shown in FIG. 6, the results of vibration test 2 showed that the response acceleration of the comparative example had a region that greatly exceeded the input acceleration, causing resonance.

[0051] The vibration isolation device 1 of the present invention comprises a base plate member 10, an intermediate plate member 20 arranged on the base plate member 10, a load plate member 30 arranged on the intermediate plate member 20 and on which a load is placed, sliding or rolling members 40 arranged between the base plate member 10 and the intermediate plate member 20 and between the intermediate plate member 20 and the load plate member 30 to enable relative movement, and sliding or rolling members 40 arranged between the base plate member 10 and the intermediate plate member 20 and between the intermediate plate member 20 and the load plate member 30. The base plate member 10, the intermediate plate member 20, and the loading plate member 30 are provided with a plurality of elastic members 50, 60 connected therebetween, and the elastic members 50, 60 are connected between first connection points Oi, Oi1 on the central side of each of the base plate member 10, the intermediate plate member 20, and the loading plate member 30 and second connection points Oo, Oo1 on the peripheral side of each of the base plate member 10, the intermediate plate member 20, and the loading plate member 30, with a radial direction A centered on the central point O of each of the base plate member 10, the intermediate plate member 20, and the loading plate member 30 and a stretching direction B connecting the first connection points Oi, Oi1 and the second connection points Oo, Oo1 offset from each other. With this configuration, the vibration isolation device 1 performs a first stage of vibration isolation by rolling the intermediate plate member 20 relative to the base plate member 10 using the rolling members 40 and returning it to its original position using the elastic members 50. Furthermore, the loading plate member 30 performs a second stage of vibration isolation by rolling it relative to the intermediate plate member 20 using the rolling members 40 and returning it to its original position using the elastic members 60. This two-stage vibration isolation effect reduces the amplitude and acceleration of large vibrations caused by seismic motion due to the vibration isolation effect of the intermediate plate member 20. The amplitude and acceleration of the loading plate member 30 are then reduced in relation to the reduced amplitude and acceleration, significantly reducing the amplitude and acceleration experienced by the load relative to the seismic motion. As a result, swaying and rippling of the water surface of a container D containing liquid as load is significantly reduced, preventing the liquid from spilling from the container D.

[0052] It is preferable that the vibration isolation device 1 is configured such that the first connection points Oi, Oi1 on the central side are provided at three locations at 120 degree intervals on a concentric circle centered on the central point, while the second connection points Oo, Oo1 on the outer periphery are provided at three locations at 120 degree intervals, shifted by 60 degrees from the first connection points Oi, Oi1, on a concentric circle centered on the central point O, and six elastic members 50, 60 are connected between the three first connection points Oi, Oi1 and the second connection points Oo, Oo1, respectively. According to this configuration, the arrangement of the six elastic members 50, 60 makes it possible to prevent the expansion / contraction direction B of each elastic member 50, 60 from overlapping with the radial direction A, thereby preventing the amplification of vibration even when seismic motion resonates with the natural frequency of the elastic members 50, 60. Furthermore, by misaligning the expansion / contraction direction B of the elastic members 50, 60 with the radial direction A centered on the center point O of the intermediate plate member 20 and the load plate member 30, it is possible to suppress resonance, and by evenly arranging the six elastic members 50, 60 between the three first connecting points Oi, Oi1 and the three second connecting points Oo, Oo1 on both sides of the radial direction A, the intermediate plate member 20 and the load plate member 30 move in a straight line in the direction of travel without being twisted by the opposing elastic members 50, 60, and rotation of the load on the intermediate plate member 20 and the load plate member 30 can be suppressed. Furthermore, by arranging the elastic members 50, 60 evenly on both the left and right sides of the radial direction A, the load on each of the elastic members 50, 60 becomes uniform, increasing durability and suppressing breakage.

[0053] It is preferable that the vibration isolation device 1 is configured such that the first connection points Oi, Oi1 on the central side are provided at four locations at 90-degree intervals on a concentric circle centered on the central point O, while the second connection points Oo, Oo1 on the outer periphery are provided at four locations at 90-degree intervals, 45 degrees offset from the first connection points Oi, Oi1, on a concentric circle centered on the central point O, and eight elastic members 50, 60 are connected between the four first connection points Oi, Oi1 and the four second connection points Oo, Oo1. According to this configuration, the arrangement of the eight elastic members 50, 60 prevents the expansion / contraction direction B of each elastic member 50, 60 from overlapping with the radial direction A, thereby preventing vibration amplification even when seismic motion resonates with the natural frequency of the elastic members 50, 60. Furthermore, by arranging the eight elastic members 50, 60 evenly on both sides of the radial direction A between the four first connecting points Oi, Oi1 and the four second connecting points Oo, Oo1, the intermediate plate member 20 and the load plate member 30 move in a straight line in the direction of travel without being twisted by the opposing elastic members 50, 60, thereby preventing rotation of the intermediate plate member 20 and rotation of the load on the load plate member 30. Furthermore, by arranging the elastic members 50, 60 evenly on both sides of the radial direction A, the load on each elastic member 50, 60 is uniform, increasing durability and reducing breakage.

[0054] The vibration isolation device 1 is configured by a plurality of intermediate plate members 20, and sliding or rolling members 40 are provided between the plurality of intermediate plate members 20, and first connecting points Oi, Oi1 and second connecting points Oo, Oo1 are provided between the plurality of adjacent intermediate plate members 20, and elastic members 50 are provided. Concatenation It is preferable to have such a configuration. According to this configuration, the multiple intermediate plate members 20 can each provide seismic isolation, and the seismic isolation effects of each story can be added together to provide seismic isolation, thereby further suppressing shaking and acceleration.

[0055] It is preferable that the vibration isolation device 1 has a load capacity on the loading plate member 30 of less than 10 kg, the elastic members 50, 60 are made of coil springs with a spring constant of 0.0015 to 0.0040 N / mm, and the other end connection portions 52, 62 of the elastic members 50, 60 to the loading plate member 30 are configured to be movable by 16 cm or more on the base plate member 10. With this configuration, if the load is less than 10 kg, vibration can be more effectively and reliably isolated by setting the spring constant of the coil springs serving as elastic members 50, 60 within this range and setting the movable distance to 16 cm or more. In addition, the necessary movable distance can be ensured, allowing the vibration isolation device 1 to be made smaller.

[0056] It is preferable that the vibration isolation device 1 has a load capacity on the loading plate member 30 of 10 kg or more and 50 kg or less, the elastic members 50, 60 are made of coil springs with a spring constant of 0.0020 or more and 0.0060 N / mm or less, and the other end connection portions 52, 62 of the elastic members 50, 60 to the intermediate plate member 20 and the loading plate member 30 are movable by 20 cm or more on the base plate member 10 and the intermediate plate member 20. With this configuration, if the load is between 10 kg and 50 kg, vibration can be more effectively and reliably isolated by setting the spring constant of the coil springs serving as elastic members 50, 60 within this range and setting the movable distance to 20 cm or more. Furthermore, the necessary movable distance can be ensured, allowing the vibration isolation device 1 to be made smaller.

[0057] The vibration isolation device 1 is preferably configured to include the vibration isolation device as one unit, and to allow one load to be placed on the load plate members 30 of a plurality of units. This configuration allows stable support even for large loads, and by changing the number of units, the degree of freedom in terms of the size of the load can be increased.

[0058] In the above embodiment, the base plate member 10, intermediate plate member 20, and loading plate member 30 of the vibration isolation device 1 are described as having circular or rectangular outer shapes, but there are no restrictions on the outer shapes and they can have any shape, and the outer shapes of the base plate member 10, intermediate plate member 20, and loading plate member 30 may be different. Furthermore, although the elastic members 50 and 60 have been described as tension coil springs, the elastic members are not limited to these and other elastic members such as rubber may also be used. Furthermore, the arrangement of the rolling members 40 and elastic members 50, 60 that enables relative movement between the base plate member 10 and the intermediate plate member 20, and the arrangement of the rolling members 40 and elastic members 50, 60 that enables relative movement between the intermediate plate member 20 and the loading plate member 30 are not limited to the above embodiments, and can be modified as appropriate, such as by swapping the inside and outside of the arrangement, as long as such functions are satisfied. [Explanation of symbols]

[0059] 1 Vibration isolation device 1A vibration isolation mechanism 1B Vibration isolation mechanism 2 Vibration isolation device 10 Base plate member 11 Lower Plate 12 Support section 13 Outer frame 20 Intermediate plate member 21 Intermediate plate 22 Bottom side 23 Top side 30 Loading plate member 31 Loading plate 32 Upper pillar part 40 Rolling members 41 Lower Ball 42 Lower support frame 43 Upper Ball 44 Upper support frame 50 Elastic member 51 One end connection part 52 Other end connection part 60 Elastic member 61 One end connection part 62 Other end connection part A Radiation direction B Stretching direction D Container Oi First connection point Oi1 First connection point Oo Second connection point Oo1 Second connection point 2 Vibration isolation device 10A Base plate material 20A Intermediate plate member 30A Loading plate member 40A Rolling parts 50A Elastic member 60A Elastic member

Claims

1. A base plate member; an annular intermediate plate member disposed on the base plate member; a load plate member disposed on the intermediate plate member and on which a load is placed; sliding or rolling members provided between the base plate member and the intermediate plate member and between the intermediate plate member and the load plate member to enable relative movement; a plurality of elastic members connected between the base plate member and the intermediate plate member and between the intermediate plate member and the load plate member; The elastic member is connected between a first connecting point on the center side of each of the base plate member and the load plate member and a second connecting point on the inner periphery of the intermediate plate member, with a difference being made between a radial direction centered on the center point of each of the base plate member, the intermediate plate member, and the load plate member and an expansion / contraction direction connecting the first connecting point and the second connecting point, a first seismic isolation mechanism is configured by the base plate member, the intermediate plate member provided on the base plate member so as to be relatively movable, and the elastic member connected between the base plate member and the intermediate plate member; a second seismic isolation mechanism is configured by the load plate member provided on the intermediate plate member so as to be relatively movable, and the elastic member connected between the intermediate plate member and the load plate member; The direction of expansion and contraction of the elastic member included in the first seismic isolation mechanism is different from the direction of expansion and contraction of the elastic member included in the second seismic isolation mechanism. A vibration isolation device characterized by:

2. The first connection points on the central portion side are provided at three locations at 120 degree intervals on a concentric circle centered on the central point, the second connecting points are provided at three locations on a concentric circle centered on the central point, the three locations being 120 degree intervals and shifted 60 degrees from the first connecting points, Six elastic members are connected between the first connecting points and the second connecting points, each of which is located at three locations. The vibration isolation device according to claim 1 .

3. The first connecting points on the central portion side are provided at four locations at 90 degree intervals on a concentric circle centered on the central point, the second connecting points are provided at four locations on a concentric circle centered on the central point, the four locations being 90 degree intervals and shifted 45 degrees from the first connecting points, Eight of the elastic members are connected between the first connecting points and the second connecting points, each of which is four in number.

3. The vibration isolation device according to claim 1 or 2.

4. The load on the loading plate member is less than 10 kg, the elastic member is made of a coil spring and has a spring constant of 0.0015 to 0.0040 N / mm, and the connection point of the other end of the elastic member to the loading plate member is configured to be movable 16 cm or more on the base plate member. The vibration isolation device according to any one of claims 1 to 3.

5. The load amount on the loading plate member is 10 kg or more and 50 kg or less, the elastic member is composed of a coil spring and has a spring constant of 0.0020 to 0.0060 N / mm, and the other end connection point of the elastic member to the loading plate member is configured to be movable by 20 cm or more on the base plate member. The vibration isolation device according to any one of claims 1 to 3.

6. The vibration isolation device according to any one of claims 1 to 5 is provided as one unit, and one load can be placed on the load plate member of a plurality of the units. A vibration isolation device characterized by:

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