JPH0466793B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a vibration absorbing device for an elevator car, and particularly to an elevator car suitable for a rope-type elevator in which a car is suspended by connecting the lower end of a rope to a car frame. This invention relates to a vibration isolator for a car.

[Background of the invention]

Generally, an elevator hoisting machine with a gear mechanism generates vibrations due to the meshing of the gears.
This vibration is transmitted to the car frame via the rope and reaches the car. As a result, the car is vibrated and generates unpleasant noise and vibrations, giving passengers a sense of discomfort and anxiety. Therefore, as shown in FIGS. 1 and 2, anti-vibration measures have been taken to reduce the noise and vibration of the car. That is, the car 1 is held on a car frame 3 via a vibration isolator 2, and the car frame 3 is suspended via a thimble rod 7 whose upper beam 3A is connected to the lower end of a rope 6. This thimble rod 7 loosely passes through the upper beam 3A and a support plate 3S disposed below the upper beam 3A, fixes a seat plate 8S on the through side, and connects the seat plate 8S and the support plate 3S. A compression spring 8 is interposed between them. The car frame 3 is therefore elastically connected to the rope 6. and the seat plate 8 of the thimble rod 7.
A vibration absorber 9 is attached to the lower side of S, and the rope 6
It is designed to absorb the vibrations that are transmitted.
This vibration absorber 9 includes a support seat plate 10 fixed to the thimble rod 7, and a vibration isolating rubber 11 arranged concentrically with the thimble rod 7 on the support seat plate 10.
and a weight 12 supported on the vibration isolating rubber 11 and arranged concentrically with the thimble rod 7. Then, vibration absorption is performed by selecting the natural frequency of the vibration absorption system consisting of the vibration isolating rubber 11 and the weight 12 so that these spring constants and weight are close to the excitation frequency transmitted from the rope 6. It's on.

However, since this vibration absorber 9 has a structure in which the vibration isolating rubber 11 and the weight 12 are stacked on the support seat plate 10,
It requires a large dimension in the height direction, and when a plurality of vibration absorbers 9A to 9C are used as shown in FIG. 3, it is inconvenient that they cannot be accommodated between the upper beam 3A and the ceiling of the car 1.

On the other hand, since the vibration isolating rubber 11 is used in the compression direction by the support seat plate 10 and the weight 12, when the vibration frequency is low and the elastic modulus of the vibration isolating rubber 11 needs to be extremely small. However, they are difficult to manufacture, have large variations in quality, and have a short service life.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a vibration absorbing device for an elevator car that requires less installation space and is easy to manufacture even when the excitation frequency is low. be.

[Summary of the Invention] In order to achieve the above object, the present invention provides a support along the extending direction of the rope on the upper beam of the car frame, and holds one side of vibration isolating rubber extending in the horizontal direction on the support. At the same time, a weight is held on the other side of the vibration isolating rubber so that a shearing force is applied to the vibration isolating rubber.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. Incidentally, since the same reference numerals as in FIGS. 1 to 3 indicate the same parts, detailed explanation will be omitted. A nut 17A is screwed into the thimble rod 7 extending below the seat plate 8S that receives the compression spring 8, and then the vibration absorber 13 is fitted, and another nut 17B is screwed in again to fix the vibration absorber 13. This vibration absorber 13 includes a holding cylinder 14 that fits into the thimble rod 7, a vibration isolating rubber 16 attached concentrically to the outer periphery of the holding cylinder 14, and a holding cylinder 14 attached to the outer periphery of the vibration isolating rubber 16.
4 and an annular weight 15 attached concentrically. The vibration isolating rubber 16 is baked and bonded to the holding tube 14 and the annular weight 15 so as to fill the annular space between the two.

In the vibration absorber 13 configured as described above, the vibration isolating rubber 16 receives a shearing force from the downward force of the annular weight 15 and the holding cylinder 14, and performs a vibration absorbing action by deformation in the shearing direction. Here, if the spring constant of the vibration isolating rubber 16 in the shear direction is K, and the mass of the annular weight 15 is M, the natural frequency f of the vibration absorber 13 is: Therefore, if the values of the spring constant K and the mass M are selected to bring the natural frequency f close to the excitation frequency transmitted from the rope, the transmission of vibration to the car can be reduced.

On the other hand, the height _H2 of the holding cylinder 14 is set to be 2 to 3 mm higher than the height H of the annular weight 15. As shown in FIG. 7, when a plurality of vibration absorbers 13A to 13C are directly stacked and attached to the lower end of the thimble rod 7, the adjacent annular weights 1
5 and 15 can operate without interference. That is, the vibration absorbers 13A to 13C are sequentially fitted onto the thimble rod 7 and the nuts 17A and 17B are tightened.
When fixed, each vibration absorber comes into contact with the end of the holding cylinder 14, which is taller than the annular weight 15.
Then, a gap G is created between the annular weights 15 of adjacent vibration absorbers. Due to this gap G, even if the annular weight 15 is displaced as shown by the two-dot chain line (15A) during vibration absorption, it will not collide with the annular weight 15 of the adjacent vibration absorber 13B.

In the above embodiment, the vibration absorbers 13 and 13A to 13C are attached using the thimble rod 7, but as shown in FIG. The same effect can be obtained even if the vibration absorber 19 having the same structure as that of the above embodiment is supported on the pillar 18 to absorb the vibrations transmitted to the car 1 via the car frame 3. can.

As explained above, since the vibration isolating rubber 16 and the annular weight 15 are arranged in the horizontal direction instead of the conventional vertical arrangement, the space in the height direction for installing the vibration absorber becomes smaller. This is because conventionally, when multiple vibration absorbers are stacked, a large space is required in the height direction as shown in FIG. Because of this, the installation space needed to be quite large. However, according to this embodiment, in addition to the above-mentioned horizontal arrangement, direct stacking arrangement is possible, so even when a plurality of vibration absorbers are used, a large space is not required.

In addition, since the vibration isolating rubber 16 is used in the shear direction, even if it becomes necessary to reduce the elastic modulus of the vibration isolating rubber 16, it is easy to manufacture and there is little variation in quality, especially when the excitation frequency is Stable performance can be obtained at low frequencies.

By the way, the vibration absorber explained above includes the holding cylinder 14,
Although each of the annular weight 15 and the vibration isolating rubber 16 is formed with an axial dimension larger than a radial dimension, for example, when there are no obstacles around the support column 18 as shown in FIG. As shown in FIG. 9, the installation height can be further reduced by using a vibration absorber 20 in which the radial dimensions of the holding tube 21, annular weight 22, and vibration isolating rubber 23 are increased.

In addition, when using a plurality of the above vibration absorbers, the case where the same vibration absorbers are stacked has been explained, but as shown in FIG. 10, it is also possible to use vibration absorbers 13 and 20 of different shapes together for vibration absorption. be.

Furthermore, each of the above embodiments has a structure in which the entire gap between the holding cylinder and the annular weight is filled with vibration-proof rubber, but as shown in FIG.
The same effect can be obtained by using vibration absorbers 24 connected at equal intervals with vibration isolating rubber pieces 26.

〔Effect of the invention〕

As explained above, the present invention provides a pillar on the upper beam of the car frame along the extending direction of the rope that suspends the car frame, and allows the pillar to hold one side of the horizontal rubber, and the vibration-proof rubber Since a weight is held on the other side and shearing force is applied to the vibration isolating rubber, the installation space in the height direction is reduced, and manufacturing is easy even when the excitation frequency is low. A vibration absorbing device for an elevator car can be obtained.

[Brief explanation of drawings]

Figure 1 is a side view of an elevator car equipped with a conventional vibration absorber at the end of the thimble rod, Figure 2 is an enlarged view of section P in Figure 1, and Figure 3 shows a state in which multiple conventional vibration absorbers are installed. 4 is a side view showing a thimble rod section equipped with a vibration absorber according to the present invention, FIG. 5 is a perspective view showing an embodiment of the vibration absorber according to the present invention, and FIG. A cross-sectional view along
Fig. 7 is a side view showing a state in which a plurality of vibration absorbers of the present invention are attached, Fig. 8 is a side view showing an elevator car in which the vibration absorbers of the present invention are attached to the upper surface of the car frame upper beam, and Fig. 9. 10 is a front view showing an example of use of the vibration absorber according to the present invention, and FIG. 11 is a plan view showing still another example of the vibration absorber according to the present invention. It is a diagram. 1... Car, 3... Car frame, 3A... Upper beam,
6... rope, 7... thimble rod, 13...
Vibration absorber, 14... Holding tube, 15... Weight, 16
... Vibration-proof rubber, 19 ... Vibration absorber.

Claims (1)

[Claims] 1. A thimble rod is engaged with the upper beam of a car frame that holds a car via an elastic body, and a rope wound around a hoist is connected to the thimble rod to suspend the car frame. In the elevator, the upper beam is provided with a support along the extending direction of the rope, the support supports one side of the vibration-proof rubber extending in the horizontal direction, and the vibration-proof rubber is held on the other side of the vibration-proof rubber. A vibration absorbing device for an elevator car, characterized in that a weight is held so that a shearing force is applied to the vibration isolating rubber. 2. In an elevator in which a thimble rod is engaged with an upper beam of a car frame that holds a car via an elastic body, and a rope wound around a hoist is connected to the thimble rod to suspend the car frame, A support column is provided on the upper beam along the extending direction of the rope, a holding tube is fitted to this main column, a vibration isolating rubber is attached concentrically to the holding tube, and an annular support is attached to the outer periphery of the vibration isolating rubber. A vibration absorbing device for an elevator car, characterized in that a weight is attached concentrically to the holding tube. 3. The vibration absorbing device for an elevator car as set forth in claim 2, wherein the support column uses the thimble rod. 4. The vibration absorbing device for an elevator car as set forth in claim 2, wherein the height of the holding cylinder is formed higher than the annular weight.