JPH10245179A - Vibration damping device of elevator car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration in two directions, further, in three directions by a single dynamic vibration reducer by using cylindrical and disk-shaped magnets in a movable part, fixing similar magnets whose polarities are reversed to the car side, and constituting the dynamic vibration reducer. SOLUTION: A dynamic vibration reducer 5 is composed of a movable part (a weight) 6, a fixing part 7 and a spacer (a vibration absorbing plate) 8. The movable part 6 is composed of two kinds of magnets 9 and 10, and the fixing part 7 is composed of magnets 11 and 12 having reverse polarity in a place corresponding to positions of the magnets 9 and 10. When the movable part 6 moves in the shearing direction, magnetic attraction force and repulsive force generated between this movable part 6 and the fixing part 7, correspond to a spring (an elastic body) in the dynamic vibration reducer 5, and an eddy current generated in the spacer 8 made of a conductive plate, acts as a damping element in the dynamic vibration reducer 5. When the dynamic vibration reducer 5 is installed in a car frame lower beam part, vibration is damped in two directions of the X and Y directions. It can cope with various vibration modes by installing a single piece or plural pieces not only in the lower beam part but also in an upper beam part, under a floor of a car, on the ceiling or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vibration damping device for an elevator car.

[0002]

2. Description of the Related Art A conventional vibration damping device for an elevator car 1 will be described with reference to FIG.

A dynamic vibration absorber 4 attached to a lower beam 3 which forms a part of a car frame 2 is adjusted to vibration in the left-right direction (X direction) of the car, for example, the frequency of the in-phase translation mode of the car frame / cab. And functions to reduce the natural vibration at the target frequency.

[0004]

However, the natural vibration of the car exists not only in the left-right direction (X direction) but also in the front-back direction (Y direction) and the up-down direction (Z direction). It can be applied to only one of the left-right direction (X direction), the front-rear direction (Y direction), and the up-down direction (Z direction).

In addition, a horizontal direction (X direction) and a front-rear direction (Y
Direction) in some cases did not match.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an elevator car vibration damping device capable of reducing vibrations in two directions, and even three directions, with one dynamic vibration absorber.

[0007]

[Means for Solving the Problems]

(Invention of Claim 1) Cylindrical and disk-shaped magnets are used for the movable portion (weight) of the dynamic vibration absorber, and a fixed magnet corresponding to the movable portion (weight) has the same polarity but with the opposite polarity. The dynamic vibration absorber is configured by fixing the magnet having the configuration to the car side.

(Invention of claim 2) A magnet having a polarity opposite to that of the movable portion (weight) is provided on the outer peripheral portion of the movable portion (weight) of the dynamic vibration absorber according to claim 1 in the left-right direction or the front-back direction. , Or both, are mounted on a car or car frame. (Invention of Claim 3) A sliding plate (vibration absorbing plate) made of an elastic body between a movable part (weight) and a fixed part of the dynamic vibration absorber according to Claims 1 and 2, and, if necessary, a movable part (weight) )
A dynamic vibration absorber having a configuration in which a magnet having the same polarity as the movable portion (weight) magnet is provided above and the elastic force of the sliding portion and the magnetic force of the magnet above the movable portion (weight) as a spring force is applied to the cage. Or, it is constructed by attaching it to a car frame.

(Invention of Claim 4) A dynamic vibration absorber having an elastic body and an attenuator so that a movable portion (weight) of the dynamic vibration absorber acts in two directions, that is, a left-right direction and a front-rear direction, is provided with a car,
Or, it is attached to a car frame to form a vibration damping device.

According to a fifth aspect of the present invention, the characteristics of the elastic body and the attenuator in one direction of the device according to the fourth aspect are different from the characteristics in the other direction so that it is possible to cope with a case where the natural vibration of the car is different. Is what you do.

(Invention of claim 6) The above claim 4 or 5
A sliding plate made of an elastic body between the dynamic vibration absorber movable part (weight) and the fixed part according to the above, or the elastic body used in claim 4 or 5, and the damper in three directions (X, Y, Z). It is characterized by having the characteristic of

According to the first and third aspects of the present invention, the vibration damping device for an elevator car can effectively attenuate vibrations in two directions without using two types of dynamic vibration absorbers. An increase in the added mass (weight) can be minimized as compared with the case where a vibration absorber is used.

According to a second aspect of the present invention, there is provided an elevator vibration damper which is effective in two directions even when the frequency of vibration to be suppressed is different between the left-right direction and the front-back direction. To provide.

In the vibration damping device for an elevator car according to the third and sixth aspects, the vibration damping device according to the first, second, fourth, and fifth aspects can vibrate in two directions with one additional mass (weight). It is possible to provide a dynamic vibration absorber effective in three directions for damping.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;

An embodiment of an elevator car vibration damping device according to the present invention will be described. (FIGS. 1 and 2) The dynamic vibration absorber 5 includes a movable part (weight) 6, a fixed part 7, and a spacer (vibration absorbing plate) 8, and the movable part (weight) 6
The fixed part 7 is composed of two types of magnets 9 and 10,
It consists of magnets 11 and 12 of the opposite polarity at the position corresponding to the zero position. The spacer (sliding body) 8 uses a conductive plate.

When the movable part (weight) 6 moves in the shearing direction, the magnetic attraction force and the repulsive force generated between the movable part (weight) 6 and the fixed part 7 generate a spring (elastic body) in a normal dynamic vibration absorber. The eddy current generated in the spacer (vibration absorbing plate) 8 made of a conductive plate acts as a damping element in a normal dynamic vibration absorber.

In FIG. 1 showing an example, the dynamic vibration absorber 5 is mounted on the lower beam 3 of the car frame by a mounting bracket. It can be seen that the dynamic vibration absorber 5 is capable of damping in two X and Y directions, while the conventional vibration damper 4 (FIG. 7) operates only in the X direction. .

In the embodiment of the present invention according to claim 2 (FIG. 3), the outer peripheral portion of the movable portion 6 in one direction (X or Y direction) with respect to the movable portion 6 of the dynamic vibration absorber of claim 1 Magnets 13 and 1 made of the same magnet at a position appropriately separated from magnet 11
3 is installed.

The magnitude and position of the magnetic field of the magnets 13 and 13 are different from those of the magnet sets 10 and 12, 9 and 11 of FIG.
By adding 13, the spring constant can be corrected to a desired spring constant, which is effective when the vibration damping frequency differs in the X direction and the Y direction. The magnet 13 also has a role as a stopper when the movable part (weight) 6 is moving largely. When using the magnet 13 only as a stopper,
Separate them by a distance that does not affect the magnetic field created between the movable part 6 and the fixed part 7, or use one that does not have magnetism.

An embodiment of the present invention according to claim 3 will be described with reference to the drawings. (FIG. 4) A vibration absorbing plate (elastic body) 14 is provided between the movable part 6 and the fixed part 7 of the dynamic vibration absorber of claim 1 or 2, and a magnet 15 is arranged above the movable part 6. With this configuration, the vibration damping effect in the other direction (Z direction) can be added to the vibration damping in the two directions (X direction, Y direction) according to the first or second aspect of the present invention.

Incidentally, the magnet 15 is not necessary when the elastic body 14 is sufficient for the vertical spring.

The invention of claim 4 (FIG. 5) A dynamic vibration absorber 16 corresponding to the conventional dynamic vibration absorber 4 (FIG. 7),
Attach it to the lower beam 3 of the car frame.

A movable part (weight) 17 and a fixed part 18, a sliding body (vibration absorbing plate) 19, elastic bodies (springs) 20, 20, 21,
21. The elastic bodies (springs) 21 and 21 restrict the movement of the movable portion 17 in the X direction, and the elastic bodies (springs) 20
And 20 regulate the movement in the Y direction.

According to the fifth aspect of the present invention (FIG. 6), the elastic members (springs) 22 and the springs 22 are arranged at a frequency in the X direction to be damped with respect to the mass of the movable portion 17 in the fourth aspect. By adjusting the constant and adjusting the spring constant of the elastic bodies (springs) 23 at the frequency in the Y direction, an attenuation effect can be provided for two different vibrations in the X and Y directions.

The invention according to claim 6 (see FIG. 5 b). The sliding body (vibration absorbing plate) 19 is made of an elastic body so that the sliding body (vibration absorbing plate) 19 can be formed in two directions (X direction and Y direction) according to the invention of claim 4 or 5 A damping effect in another direction (Z direction) can be added to the damping.

As described above, the embodiment of FIG. 1 to FIG. 4 is not only attached to the lower beam 3 of FIG. 1 or FIG. By attaching them individually, it becomes possible to correspond to various modes of vibration.

In the first or second embodiment,
The spacer 8 is made of a conductor, but is made of a non-conductive material, and does not significantly affect the formation of the magnetic field of the movable portion (weight) 6 and the fixed portion 7, and the movable portion (weight) 6 can slide. It is formed of a material (for example, plastic). Thus, the damping force inside the dynamic vibration absorber is obtained by the frictional force between the movable part (weight) 6 and the fixed part 7. For this purpose, it is only necessary to provide the damping force with directional characteristics by the unevenness of the surface of the spacer 8.

[0029]

According to the first or third aspect of the present invention, it is possible to obtain an elevator vibration damping device capable of damping in two directions by itself and capable of minimizing an increase in weight. Can be.

According to the first or third aspect of the present invention, even when the frequency of the vibration damping device to be damped is different between the left and right (X direction) and the front and rear (Y direction) of the car, An elevator damping device capable of damping in two directions can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of an elevator according to a first embodiment of the present invention.

2A is a plan view showing a part of FIG. 1 in detail, and FIGS.
FIG.

3 (a) is a partial plan view of a dynamic vibration absorber according to a second embodiment of the present invention, and FIG. 3 (b) is a front view of FIG.

FIG. 4 (a) is a partial plan view of a dynamic vibration absorber according to a third embodiment of the present invention, and FIG. 4 (b) is a front view of FIG.

5A is a partial plan view of a dynamic vibration absorber according to a fourth embodiment of the present invention, and FIG. 5B is a front view of FIG.

6A is a partial plan view of a dynamic vibration absorber according to a fifth embodiment of the present invention, and FIG. 6B is a front view of FIG.

FIG. 7 is a front view of a conventional elevator car and a dynamic vibration absorber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car 2 Car frame 3 Lower beam 4, 5, 16 Dynamic vibration absorber 6, 17 Movable part (weight) 7, 18 Fixed part 8 Spacer (or vibration absorbing plate) 9 Magnet (outer peripheral part on fixed side) 10 Magnet (Center on fixed side) Part) 11, 12 magnet (outer peripheral part, central part on the movable side) 13, 15 magnet (for adjustment) 14, 19 elastic plate (sliding plate) 20, 21, 22, 23 elastic body (rubber sliding plate)

Claims (6)

[Claims] 1. A magnet device formed by opposing two cylindrical magnets via a conductive spacer (vibration absorbing plate), wherein one magnet is fixed to a car side, the other magnet is a movable weight, and The car is damped by forming a dynamic vibration absorbing device with a spring (elastic body) using the inertial mass of the movable weight portion and the attraction / repulsion force between the magnet of the movable weight portion and the fixed-side magnet portion as a spring (elastic body). Elevator car vibration damping device. 2. A magnet according to claim 1, wherein a pair of magnets of the same magnetic pole are arranged in a fixed direction (X or Y) with respect to the outer surface of the cylindrical magnet of the movable portion of the dynamic vibration absorber. Elevator car vibration damping device. 3. An elastic plate is superimposed on the conductive spacer (vibration absorbing plate), and a magnet is further provided above the movable portion, so that the mass of the entire movable portion, the elastic force of the vibration absorbing plate portion, and the upper magnet are controlled. An elevator car vibration damping device comprising the dynamic vibration absorber according to claim 1 or 2, wherein the suction force and the repulsion force are configured as springs. 4. A X- and Y-direction in the plane direction of the car by connecting a disc-shaped movable weight and a cylindrical fixed portion of the car containing the movable weight via a vibration absorbing (sliding) plate with a rubber-like elastic body. A vibration damper for an elevator car, wherein a dynamic vibration absorber capable of absorbing vibration in two directions of a shaft is mounted on a car side. 5. The vibration damping device for an elevator car according to claim 4, wherein a dynamic vibration absorber having characteristics of the elastic body / sliding damping plate in one direction different from characteristics in the other direction. 6. A dynamic vibration absorber acting in three directions, wherein the rubber-like elastic body connecting the movable weight part and the car-side fixing part is shaped so as to also act in the vertical (Z) direction. Item 6. The elevator car vibration damping device according to item 4 or 5.