JP3705507B2 - Vibration control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration damping device that is attached to a vibration suppression object in order to suppress vibrations of the vibration suppression object such as a structure that easily generates vibration.
[0002]
[Prior art]
Conventionally, as a vibration damping device, for example, a device described in Japanese Patent Laid-Open No. 6-17875 is known. This vibration damping device has a frame composed of a horizontal base, an upright column, and a horizontal beam that extends horizontally from the upright column above the horizontal base. One end of the arm is pivotally attached to the upright column at a distance from the horizontal base, and the free end side of the arm extends substantially horizontally so as to be pivotable in the vertical direction. A mass is attached on the arm. A coil spring is interposed between the arm and the horizontal base substantially vertically and a damper is interposed, and an additional coil spring is interposed between the arm and the horizontal beam substantially vertically. Is.
This vibration damping device is mounted on a vibration suppression object via a horizontal base, and when the vibration suppression object vibrates, has an natural frequency substantially equal to that of the vibration suppression object, and includes an arm, a mass, and a coil spring. The vibration system consisting of this is vibrated and combined with the action of the damper suppresses the vibration of the object to be controlled.
[0003]
[Problems to be solved by the invention]
Depending on the vibration control target, there may be a case where only a very small space can be secured in order to install the vibration control device. Accordingly, there is a demand for downsizing the vibration damping device. Since the conventional vibration damping device has an arm, a mass, two coil springs, and a damper, there is a limit to downsizing.
Accordingly, an object of the present invention is to provide a vibration damping device that can be miniaturized by using a member without impairing the performance of the conventional vibration damping device as described above.
[0004]
[Means for Solving the Problems]
In the present invention, in order to solve the above-described problem, the horizontal base 3 and a pair of opposing support members 7 and 8 continuous to the horizontal base 3 are supported substantially horizontally with a space above the horizontal base 3. The plate spring 9 which can be bent in the vertical direction, the mass 11 arranged on the plate spring 9 so as to be movable in the vertical direction according to the deflection of the plate spring 9, the vertical movement of the mass 11 and the plate spring The vibration damping device is configured by including the leaf spring 9 and the damper 12 interposed between the horizontal base 3 or a portion continuous with the plate spring 9 so as to suppress the bending of 9. The arm and the two coil springs in the conventional device are also used by the leaf spring 9 in the present invention, and the size can be reduced.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. 1 is a front view of the vibration damping device, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII in FIG.
[0006]
The vibration damping device 1 according to the present invention is mounted on a large beam B or the like of a building such as a building that is a vibration damping target.
[0007]
The vibration damping device 1 includes a horizontal base 3 fixed on the beam B, a pair of upright columns 4 and 5 rising vertically from both ends of the horizontal base 3, and the upper ends of the upright columns 4 and 5. It has a frame 2 consisting of a horizontal beam 6 to be joined. On both sides of the horizontal base 3, support members 7 and 8 are provided in which the upright columns 4 and 5 have one side, respectively. The support members 7 and 8 are respectively provided with horizontal platforms 7a and 8a at the upper part.
[0008]
A plate spring 9 formed by superposing a plurality of spring steel plates is installed between horizontal support frames 7 a and 8 a via receiving frames 10 and 10. The leaf springs 9 are arranged substantially horizontally with an interval above the horizontal base, and can be bent in the vertical direction. The receiving frame 10 is a rectangular frame constructed by laying three collars 10b, 10c, 10d with a space between a pair of opposed support plates 10a, 10a. The horizontal supporting frame 7a, 8a is received, and the end of the leaf spring 9 is received between the collars 10c and 10d. The support plates 10a and 10a can hold and fix the horizontal support frames 7a and 8a by fastening bolts penetrating the collars 10b and 10c. The fixed position can be adjusted arbitrarily. The collars 10 c and 10 d constitute a fulcrum of the leaf spring 9, and the fulcrum can be moved and adjusted in the longitudinal direction of the leaf spring 9 by the movement of the receiving frame 10.
[0009]
A mass 11 is attached on the leaf spring 9. The mass 11 swings in the vertical direction according to the bending of the leaf spring 9. The leaf spring 9 passes through the mass 11 and is fixed to the mass 11 with a fastening bolt 11a. The fixed position of the mass on the leaf spring 9 can be changed. A recess 11 b is provided in the lower part of the mass 11. A handle 11c is provided at the center of the top surface of the recess 11b.
[0010]
The damper 12 is interposed between the leaf spring 9 and the horizontal base 2 so as to suppress the vertical movement of the mass 11 and the bending of the leaf spring 9. In the illustrated embodiment, the mass 11 is interposed between the damper 12 and the leaf spring 9, but the damper 12 may be directly coupled to the leaf spring 9. The damper 12 is of a magnetic friction type and includes a lower case 13 and an upper insert 14. A puller 14 a at the upper end of the insert 14 is freely coupled to a puller 11 c of the mass 11. A puller 13 a at the lower end of the horizontal base 3 is freely coupled to a puller 3 a of the horizontal base 3.
[0011]
The case 13 has a box shape and is open upward. A lower part of the plate-like insert 14 is inserted inside the case 13 so as to freely enter and exit in the vertical direction. The case 13 has three rectangular openings 13b and long holes 13c formed on opposite side walls so as to face each other. The opening 13b and the long hole 13c may be single or plural. In the illustrated embodiment, the openings 13b are arranged at equal intervals in the horizontal direction, and the long holes 13c extend along the vertical center line of the opening 13b.
[0012]
The insert 14 is formed by attaching magnetic adsorption plates 16 to both surfaces of a substantially rectangular substrate 15 made of a ferromagnetic material. A magnetic adsorption surface is formed on the surface of the magnetic adsorption plate 16. The magnetic attraction plates 16 are each substantially rectangular, and are attached so as to extend in the vertical direction along with the horizontal direction so as to correspond to the opening 13 b of the case 13. The magnetic attraction plate 16 is formed by fixing two ferromagnetic plates 16b and 16b separated vertically on the back surface of a ferromagnetic thin rectangular plate 16a. A space is provided between the upper and lower ferromagnetic plates 16b and 16b, and the upper and lower ferromagnetic plates 16b and 16b are notched obliquely so that the surface area thereof decreases downward or upward. Accordingly, a ferromagnetic portion and a weak magnetic portion are formed on the magnetic adsorption surface of the insert 14. The magnetic attraction plate 16 is rotatably supported by the substrate 15 at the center by a pin 16c, and is fixed at an appropriate rotational angle position by a bolt 16e screwed to the substrate 15 through upper and lower arc-shaped holes 16d. The head of the bolt 16 e can move up and down in the elongated hole 13 c of the case 13.
[0013]
A magnetic friction member 17 attracted to the magnetic attracting surface of the insert 14 is fitted in the opening 13b of the case 13 so as to be movable in a substantially horizontal direction. The magnetic friction member 17 is formed by alternately superposing rectangular magnetic plates 17a and magnet plates 17b. The magnetic plate 17a is slightly larger than the magnet plate 17b, and the edge protrudes from the end of the magnet plate 17b.
[0014]
Therefore, when the large beam B to which the vibration damping device 1 is attached vibrates, the leaf spring 9 vibrates so as to bend up and down together with the mass 11. Since this vibration system has a natural frequency substantially equal to that of the large beam B to be controlled, vibration of the large beam B is suppressed. At this time, the vibration energy is attenuated by the action of the magnetic friction damper 12. That is, the insertion body 14 moves up and down relatively with respect to the case 13 due to the vibration of the mass 11, but since the magnetic friction member 17 is adsorbed on the magnetic adsorption surface of the insertion body 14, there is a frictional resistance therebetween. As a result, vibration energy is converted into heat and attenuated. Since the area of the ferromagnetic plate 16b changes in the vertical direction, the attractive force of the magnetic friction member 17 with respect to the magnetic attractive surface of the insert 14 changes due to the relative displacement in the vertical direction. This rate of change can be changed by changing the fixed angle of the magnetic attraction plate 16 with respect to the substrate 14. This rate of change is set as appropriate depending on the nature of the vibration control target. Furthermore, if the shape of the tapered portion of the ferromagnetic plate 16b is changed, a desired rate of change can be set.
[0015]
In another embodiment of the present invention shown in FIG. 5, the configuration of the magnetic friction damper 22 is different from that of the previous embodiment. Since this embodiment is the same in basic configuration as that of the embodiment shown in FIGS. 1 to 4, in FIGS. 5 and 6, the former components are the same as or similar to those of the latter. Are denoted by the same reference numerals and will not be described in detail. That is, the damper 22 includes a case 23 fixed to the upright column 5 serving as one support member, an arm 24 supported by the upright column 4 serving as the other support member so as to swing up and down, and a case 23 And a magnetic friction member 17 fitted in the opening 23a.
[0016]
The arm 24 is fixed to the mass 11 so that the position of the arm 24 can be adjusted in the middle, and the insert 14 at the distal end is received in the case 23 through the side opening so as to be movable up and down. A magnetic adsorption plate 16 is fixed to the surface of the substrate 15 of the insert 14 and a magnetic friction member 17 is adsorbed thereto.
[0017]
The pair of leaf springs 9 extend along both side surfaces of the mass 11 and are sandwiched between upper and lower rollers 11 d and 11 d on the mass 11, and can be bent in the vertical direction with the mass 11.
[0018]
Therefore, the vibration system composed of the leaf spring 9 and the mass 11 in the vibration damping device 21 of this embodiment has a natural frequency different from that of the vibration damping object, and suppresses the vibration of the vibration damping object. Further, when the arm 24 swings up and down with vibration, the magnetic friction damper 12 acts to attenuate the vibration energy.
[0019]
【The invention's effect】
As described above, in the present invention, the horizontal base 3 and the pair of opposing support members 7 and 8 that are continuous to the horizontal base 3 are supported substantially horizontally at a distance above the horizontal base 3. A plate spring 9 which can be bent in the vertical direction, a mass 11 which is arranged on the plate spring 9 so as to be able to move in the vertical direction according to the deflection of the plate spring 9, and the vertical movement of the mass 11 and the plate spring 9. Since the vibration damping device is configured by including the leaf spring 9 and the damper 12 interposed between the horizontal base 3 or a portion continuous with the plate spring 9 so as to suppress the bending, the arm and the two in the conventional device are configured. It is possible to provide a vibration damping device that can be miniaturized by using a coil spring as the leaf spring 9.
[Brief description of the drawings]
FIG. 1 is a front view of a vibration damping device.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
3 is a sectional view taken along line III-III in FIG.
FIG. 4 is an exploded perspective view of a magnetic friction damper.
FIG. 5 is a front view of a vibration damping device of another embodiment.
6 is a sectional view taken along line VI-VI in FIG.
7 is a cross-sectional view taken along line VII-VII in FIG.
[Explanation of symbols]
1 Damping device 3 Horizontal base 7 Support member 8 Support member 9 Leaf spring 11 Mass 12 Damper B Large beam (damping target)

Claims (4)

A horizontal base, a leaf spring capable of bending in the vertical direction supported substantially horizontally at a distance above the horizontal base by a pair of opposing support members continuous to the horizontal base, and bending of the leaf spring And a magnetic friction interposed between the leaf spring and the horizontal base so as to suppress the vertical movement of the mass and the bending of the leaf spring. In a vibration control device equipped with a damper,
The magnetic friction damper is supported by the horizontal base at the lower part so as to be swingable and opened upward, and the lower part is inserted into the case so as to be able to enter and exit in the vertical direction. An insertion body that is freely supported, and a magnetic friction member that is fitted to the opening of the side portion of the case so as to be movable in a substantially horizontal direction and magnetically attracts to the magnetic adsorption surface of the insertion body. One of them is connected to the mass, and the other is connected to the horizontal base, respectively.   A ferromagnetic portion and a weak magnetic portion are formed on the magnetic attracting surface facing the magnetic friction member, and the area of the ferromagnetic portion that the magnetic friction member contacts with the change in relative displacement between the magnetic friction member and the magnetic attracting surface. The vibration damping device according to claim 1, wherein the vibration damping device is configured to change.   2. The vibration damping device according to claim 1, wherein a support point on at least one end side of the leaf spring is configured to be movable in an extending direction of the leaf spring on one support member.   The magnetic friction damper is fixed to one of the supporting members and is opened to the side, and is supported by the other supporting member at one end so as to be swingable in the vertical direction, and is intermediately engaged with the mass. The other end of the arm is inserted into the case so as to be movable up and down, and is fitted into the opening of the side of the case so as to be movable in a substantially horizontal direction, and is magnetically attracted to the magnetic attraction surface of the arm located in the case. The vibration damping device according to claim 1, further comprising a magnetic friction member.

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