JPS6311276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration prevention device for preventing vibrations occurring in an elevator.

FIG. 1 shows a schematic configuration of a conventional elevator.
In FIG. 1, 1 is a car compartment, 2 is a car frame that supports the car compartment, 3 is a rope that connects one end to the car frame 2 to suspend the car compartment 1 and the car frame 2, and 4
5 is a hoisting machine for hoisting the rope 3 to raise and lower the car 1; 5 is a suspension weight connected to the other end of the rope 3 to balance the weight of the car 1; 6 is the rope 3; This is a diversion wheel for installing the vehicle by deflecting it.

FIG. 2 shows in more detail the structure of section A surrounded by the broken line in FIG. In FIG. 2, 7 is a spring seat 8 attached to the end of the rope 3.
This is a shaft spring that is spirally wound around a rope 3 between the inner surfaces of a car frame 2 and a car frame 2.

The elevator configured in this way has a hoisting machine 4
By winding up the rope 3, the cage 1 is raised and lowered. Generally, a hoisting machine with a gear mechanism 4
generates vibrations due to the meshing of gears. This vibration excites the rope 3, and may match the natural frequency of the rope 3 and resonate. When resonance occurs in the rope 3, large vibrations and noise are generated in the cage 1 suspended from the rope, causing discomfort to passengers. The natural frequency of the rope 3 is mainly determined by the length of the rope 3, the spring constant of the shaft spring 7, and the weight of the car chamber 1 and car frame 2.
The length of the rope 3 changes depending on the position of the car 1 in the hoistway, and the weight of the car 1 changes depending on the number of passengers, so as a result, the natural frequency of the rope 3 is distributed over a wide range of frequencies. become. Therefore, it was inevitable that the frequency of the hoist 4 and the natural frequency of the rope 3 would match and resonate.

In conventional elevators, in order to prevent large vibrations from occurring in the car chamber 1 due to the resonance of the rope 3, a shaft spring 7 is inserted at the connection point between the rope 3 and the car frame 2, and the vibration of the rope 3 is transmitted to the car chamber 2. was prevented from being transmitted to. However, this conventional means has no effect of preventing the resonance of the rope 3, so the resonance of the rope 3 still occurs, and the effect of preventing the vibration generated in the cab 1 is only small. Nakatsuta.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by making the natural frequency of each rope 3, which is composed of a plurality of ropes 3, different from each other, the rope 3 can be improved. To provide a vibration prevention device for an elevator that can prevent all components from simultaneously resonating with the vibrations of the hoisting machine 4 and, as a result, eliminate vibrations generated in the car compartment 1.

An embodiment of the present invention will be described below with reference to the drawings. The only difference in this invention from the configuration of the prior art is the part A shown by the broken line in FIG. 1, so only this part will be explained. In FIG. 3, reference numeral 9 denotes weights 10 of different weights attached to the ends of each rope 3 passing through the car frame 2 and the car frame 2.
A shaft spring is wound spirally between the ropes 3 and has a different spring constant for each rope 3. 11 is each weight next to each other 10
Frictional materials inserted between them include springs 12, 13, and 14 for pressing all the weights 10 and all the frictional materials 11 together in the horizontal direction with a set surface pressure;
The holding means consisting of bolts and nuts is shown.
Note that all the weights 10 and friction materials 11 are provided with through holes in the horizontal direction, and at least the through holes through which the bolts 13 pass are
The size is such that there is enough clearance in the vertical direction to allow sufficient vibration in the direction of.

In the elevator according to the present invention configured as described above, the shaft springs 9 inserted between the ropes 3 and the car frame 2 are different for each rope 3, and the weights 10 of different weights are attached to the ends of the ropes 3.
are provided, the natural frequencies of each rope 3 have different values. Therefore, when the hoisting machine 4 hoists the rope 3, vibration is generated in the hoisting machine 4, and even if this is transmitted to the rope 3, since the natural frequencies of the ropes 3 are different, the rope 3 The resonance occurs in a dispersed manner. Therefore, it is possible to prevent all the ropes 3 from resonating at the same time,
As a result, vibrations in the cage 1 due to resonance of the rope 3 can be prevented. Further, according to the present invention, even if resonance occurs in one rope 3, the friction material 11 when the weight 10 of the rope 3 vibrates alone in the P direction.
Due to the vibration damping effect of , resonance can be suppressed to a small level. Furthermore, the small vibration of the rope 3 is
Needless to say, the transmission to the car frame 2 is prevented by the shaft spring 9.

In the above embodiment, for each rope 3, a shaft spring 9 with a different spring constant and a weight 10 with a different weight are used in combination at the same time, but if one of the ropes 3 has the same spring constant, Shackle springs 9 of different weights and weights 10 of the same weight, or weights 10 of different weights and shackle springs 9 of the same spring constant may be used in combination.

As described above, according to the vibration prevention device for an elevator of the present invention, in an elevator in which a car is raised and lowered by a plurality of ropes, a weight is provided at one end of each rope, and the weight is attached to the rope between each weight and the car frame. disposing a shaft spring, making at least one of the spring constant of each shaft spring and the weight of each weight different from each other, or making both the spring constant and the weight different from each other, and providing a friction material between each of the weights, Since a holding means is provided to hold the weight and the friction material in pressure contact with each other, the natural frequency transmitted to each rope by the hoisting machine etc. can be made to have a different frequency for each rope. At the same time, it is possible to disperse the vibrations so that they do not resonate with the vibrations of the hoisting machine, etc. and propagate them to the cab, and the vibrations of the rope are more easily attenuated, thereby minimizing the vibrations generated in the cab. This has the effect of providing an elevator with a comfortable ride.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram showing a conventional elevator;
FIG. 2 is a sectional view showing a conventional elevator vibration prevention device, and FIG. 3 is a sectional view showing an elevator vibration prevention device according to an embodiment of the present invention. 2... Car frame, 3... Rope, 9... Shackle spring, 10... Weight, 11... Friction material, 12
...Spring, 13...Bolt, 14...Natsuto. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A car frame that supports a car room, and a plurality of ropes that have one end suspending the car frame and the other end that connects a suspension weight via a hoist to raise and lower the car room. In the elevator, a weight is provided at one end of each rope passing through the car frame, and a shaft spring is arranged between each weight and the car frame, and at least the spring constant of each shaft spring and the weight of each weight are provided. one of the weights is made different from each other, or both the spring constant and the weight are made different from each other, and a friction material is provided between each of the weights,
A vibration prevention device for an elevator, comprising a holding means for holding the weight and the friction material in a direction in which they are pressed against each other. 2 The means for holding the weight and the friction material in pressure contact with each other is a spring disposed at both ends of a bolt that freely passes through the weight and the friction material in the horizontal direction and has a gap in the vertical direction. 1st
Anti-vibration device for elevators as described in .