JPH0383792A - Elevator - Google Patents

Abstract

PURPOSE:To reduce several kinds of lateral vibrations of the floor of an elevator cage with a simple method by attaching auxiliary weights at symmetrical positions about the sling center on a cage frame member which is below the gravitational center of the cage and which is positioned in a plane between two guide rails which faces each other laterally. CONSTITUTION:A floor frame 7 to which the floor 6 of a cage room 5 is supported through the intermediary of a vibration damping rubber 15, is attached tot he lower frame member 3 of a cage frame. This cage frame is positioned substantially the gravitational center of a cage, and is guided by two rails through the intermediary of guide shoes 4. In this arrangement, a buffer receiver 8 is secured to the center of the lower frame member 3 of the cage, and two auxiliary weights 9 are attached between lower frames on the right and left sides thereof, by means of bolts 10 and nuts 11. Accordingly, since the gravitational center of the cage is lowered, and the natural frequency of rotational mode about the sling center axis becomes high, it is possible to reduce the lateral vibration of the cage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an elevator, and more particularly to an elevator having a car structure suitable for improving lateral vibration performance during running.

[Conventional technology]

Conventionally, as a method for attaching auxiliary weights to elevator seats, those described in Japanese Utility Model Application No. 55-12928 and Japanese Patent Publication No. 55-25590 have been devised. Furthermore, in general, in high-speed elevators, a method of attaching balance weights to part of the corner of the floor frame member of the car is also used in order to maintain the static balance of the car.

In addition, as a device to prevent vibration in the vertical direction,
As shown in Japanese Patent No. 8-86237, a dynamic damper suspended from a cage has also been proposed.

[Problem to be solved by the invention]

However, among the above-mentioned conventional technologies,
The method described in Publication No. 29281 attaches auxiliary weights to the floor beams of the car compartment, which are supported by anti-vibration rubber. Although it is effective in improving the vibration performance in the longitudinal direction, it is not effective in reducing lateral vibration at a low frequency of about 1 to 10 Hz.

In addition, what is described in Japanese Patent Publication No. 55-25590 is
An auxiliary weight is placed on the upper frame of the car, which is effective for adjusting the weight of the corner of the car, but because the center of gravity is raised, it has a negative effect on lateral vibration of the corner of the car.

In addition, as conventionally carried out in high-speed elevators,
The method of attaching a balance weight to a part of the corner of the floor frame lowers the center of gravity of the car, but the natural frequency of rotational vibration around the suspension center of the floor decreases due to the foot of the car, so it approaches the natural frequency of translational vibration. As a result, the frequency response level increases, causing the problem that vibrations are rather amplified.

Furthermore, although the auxiliary weight suspended from the car frame via a spring and vibration damping device described in JP-A No. 48-86237 is effective against constant vibration in the vertical direction, it is not effective in the lateral direction. On the other hand, there is a risk that the vibrations will be amplified.

An object of the present invention is to provide an elevator car in which lateral vibrations such as longitudinal and lateral vibrations or rotation of the car floor are reduced in a simple manner.

[Effect]

According to the above configuration, the auxiliary weight is attached to the car frame member located below the center of gravity of the car and within the plane sandwiched between the two guide rails facing left and right, at a position symmetrical with respect to the suspension center. When installed, lateral (left-right) vibration within the plane between the guide rails is reduced because the center of gravity of the corner is lowered. In addition, lateral vibration perpendicular to the plane between the guide rails (back and forth) can be reduced by installing the auxiliary weight within the plane between the guide rails, compared to when it is mounted outside the plane. The rotational moment of inertia around the center can be reduced, and as a result, it is possible to increase the natural vibration of one rotational vibration, which approaches the natural frequency of translational vibration, so there is no need to amplify the vibration.

This principle will be explained below using FIGS. 1 to 7.

First, lateral vibration within a plane between two guide rails can be considered using the model shown in FIG.

Figure 1 is a schematic diagram of the front of the elevator car.
A car frame made up of an upper frame 1, a vertical frame 2, and a lower frame 3 is guided through a guide device (guide shoe) 4 by guide rails (not shown) passing vertically to the left and right in the figure. The car room S has a vibration isolating member 1 attached to the car room floor frame attached to this lower frame 3.
Supported through 5.

Looking at the primary mode, which has the greatest influence among the vibration modes during normal driving, when the center of gravity 12 of the car is high,
As shown in Figure 2, the horizontal vibrations are almost the same on the top and bottom, but
When the center of gravity 12 is low, as shown in FIG. 3, the vibration of the lower frame 3 is smaller than the vibration of the upper frame 1. That is, the lower the center of gravity 12 is, the more the lateral vibration of the car floor is reduced.

On the other hand, lateral vibration in a direction perpendicular to the plane sandwiched between the two guide rails can be considered using the model shown in FIG.

FIG. 4 is a schematic view of the car from above, showing the car frame guided by a guide device 4 on guide rails (not shown) and the floor 6 of the car room supported by the car frame. ing.

In this model, the vibration mode has two modes: translational mode a shown in Fig. 5 and rotational mode b shown in Fig. 6.
The natural frequencies fa and fb of these two modes are determined by the following formulas.

Here, k is the spring constant of part of the guide rail m squared Car mass Ql: Distance from the center of gravity to the guide rail ■ i = radius of rotation (i = ++-, I: moment of inertia) As is clear from the above equation, the car mass If m is constant, the natural frequency f & of the translation mode a is constant, but the natural frequency f of the rotation mode b changes depending on the radius of rotation i around the center of gravity or the moment of inertia. Also, fb
is fa's I! , /i times, that is, the smaller the radius of rotation i, the higher the natural frequency f1 of the rotational mode becomes, and the further away it is from the natural frequency f& of the translational mode. The radius of rotation around the center of gravity (center of suspension) of the Inovator car is smallest when the mass is concentrated on the line connecting the two guide rails, that is, at the bottom frame, and the value at this time is: Furthermore, since the depth dimension of an elevator car is generally 1.5 times or less than the frontage dimension, the maximum value of the turning radius is as follows. That is, the natural frequency fb of the rotation mode is fba
``It will change in the range of O-96fa to fb1 = 1.'73fa□.

As is clear from this, when the auxiliary weight is concentrated in the lower frame portion, the natural frequency fbl of the rotational mode and the natural frequency f& of the translational mode are far apart.

If the auxiliary weight is attached to the outside of the lower frame or attached to a part of the floor corner, the natural frequency fb of the rotational mode and the natural frequency f& of the translational mode will become very close to each other and begin to influence each other.

The frequency response of the vibration on the floor 6 at this time is shown in FIG.
As the natural frequency fbl of the rotational mode and the natural frequency f& of the translational mode approach each other and begin to influence each other, the response level increases as shown by the dotted line in the figure, and it can be seen that the vibration becomes larger. .

Therefore, the lateral vibration in the direction perpendicular to the surface sandwiched between the two guide rails can be minimized by attaching the auxiliary weights to the lower frame portion in a concentrated manner.

〔Example〕

Hereinafter, some embodiments of the present invention will be described based on the drawings. Note that the same reference numerals are given to the same structural parts as in the conventional example, and the explanation thereof will be omitted.

8 and 9 show a first embodiment of the present invention. In FIG. 8, a floor 6 of a car compartment 5 is supported by a floor frame 7 via a vibration isolating rubber 15. Frame 7 is the lower frame 3 of the basket frame
installed on. In this embodiment, the car frame is located almost at the center of gravity of the corner of the car and is guided by two guide rails via a guide shoe 4. In this embodiment, a buffer receiver 8 is provided at the center of the lower frame 3 of the car. As shown in FIG. 9, two auxiliary weights 9 are attached between the left and right lower frames with bolts 10 and nuts 11.

According to this embodiment, the position of the center of gravity of the car corner is low and the natural frequency of the rotation mode around the hanging center axis is high, so that the lateral vibration of the car can be reduced.

FIG. 10 and FIG. I1 show a second embodiment, and in FIG.
In this embodiment, in which one auxiliary weight 9 is attached between the two buffer receivers with bolts 10 and nuts 11, the same effects as in the first embodiment can be obtained.

12 and 14 show a third embodiment, and in FIG. 13, the auxiliary weight 9 has a horizontally protruding protrusion 9a on the upper part, which is attached to the upper part of the two lower frame 3. It is placed on a horizontal surface 3a to prevent it from falling.

Further, as shown in FIG. I2, the auxiliary weights 9 are thin and light, each having a thickness of about 20 mm, and a plurality of them are stacked and used. When attaching the auxiliary weights 9, as shown in FIG. Place it on the upper part 3a of the lower frame 3. After placing the auxiliary weight 9 until the predetermined weight is reached, the weight presser 13. The movement of the auxiliary weight 9 is prevented by the rail clip 14, bolt 10, and nut 11.

According to this embodiment, the same effects as in the first embodiment can be obtained, but in addition, since the auxiliary weight is divided, there is an effect that installation is extremely easy. In addition, since the auxiliary weights are split, the total weight of the car can be kept constant by increasing or decreasing the number of auxiliary weights in response to changes in the car's own weight, excluding the weight of the auxiliary weights. Therefore, regardless of changes in the car design, the total weight of the cars remains constant, and the elevator installation planning becomes very easy.

〔Effect of the invention〕

According to the present invention, the center of gravity of the car can be lowered, and the natural frequency of the rotation mode around the hanging center axis can be increased, thereby reducing the frequency of the natural vibration of the lateral translational vibration mode. It is effective in reducing lateral vibration.

Further, by dividing the auxiliary weight and providing a horizontal protrusion on the upper part to form a shape that can be engaged with the lower frame, there is an effect that attachment of the auxiliary weight becomes easy.

Furthermore, since the auxiliary weights are divided, the total weight of the corner can be kept constant at all times by increasing or decreasing the number of auxiliary weights in response to changes in the weight of the car due to the design of the car.

[Brief explanation of drawings]

Figure 1 shows the car vibration model in the plane between the two guide rails, Figures 2 and 3 show the vibration modes, and Figure 4 shows the vibration model in the plane between the two guide rails. Vertical direction car vibration model, Figures 5 and 6 are diagrams showing its vibration mode, Figure 7 is a diagram representing the frequency response of lateral vibration of the car floor, and Figures 8 and 9 are figures showing the present invention. Fig. 8 is a front view of the car, and 9th Wi is the 8th embodiment.
The AA sectional view, FIGS. 10 and 11 in the figure show the second embodiment. FIG. 10 is a front view of the car, and FIG. 11 is a BB sectional view in FIG. Figures 12 to 14 show the third embodiment, where Figure 12 is a front view of the car and Figure 13 is a front view of the car.
The figure is a cross-sectional view taken along the line C-C in Figure 12, and Figure 14 is a cross-sectional view taken along the line D in Figure I2.
It is an arrow view. l... Upper frame, 6... Floor, 13... Auxiliary weight presser, 2... Vertical frame, 7... Floor frame, 3...
・Lower frame, 8... Buffer receiver, 4... Guide device, 9... Auxiliary weight, S... Car room,
12... Center of gravity.

Claims (1)

[Scope of Claims] 1. It has a guide rail installed upright in a hoistway, a guide device that engages with the guide rail, and a car to which the guide device is attached and which moves up and down while being guided by the guide rail. In the elevator, the car has an auxiliary weight attached to the car in a plane connecting two guide rails erected across the car and below the center of gravity of the car. An elevator characterized by: 2. An elevator having a guide rail installed vertically in a hoistway, a guide device that engages with the guide rail, and a car to which the guide device is attached and moves up and down guided by the guide rail, the car is characterized in that an auxiliary weight is attached to the car frame that supports the car compartment of the car and to which the guide device is attached, below the center of gravity of the car and at a symmetrical position with respect to the center. elevator. 3. An elevator having a guide rail installed vertically in a hoistway, a guide device that engages with the guide rail, and a car to which the guide device is attached and moves up and down while being guided by the guide rail, wherein the car In this case, an auxiliary weight is attached to the lower frame member of the car frame that supports the car compartment of the car and is attached with the guide device, at a position below the center of gravity of the car and symmetrically with respect to the center. An elevator characterized by: 4. An elevator having a guide rail installed vertically in a hoistway, a guide device that engages with the guide rail, and a car to which the guide device is attached and moves up and down guided by the guide rail, the car is an auxiliary support located below the center of gravity of the car and symmetrically with respect to the center on both sides of the lower frame member of the car frame that supports the car compartment of the car and to which the guide device is attached. An elevator characterized in that it is equipped with weights. 5. An elevator having a guide rail installed vertically in a hoistway, a guide device that engages with the guide rail, and a car to which the guide device is attached and moves up and down guided by the guide rail, the car An auxiliary weight is attached to the center of the lower frame member of the car frame that supports the car compartment of the car and is attached with the guide device, at a position below the center of gravity of the car and symmetrically with respect to the center. An elevator characterized by being a thing. 6. An elevator having a guide rail installed vertically in a hoistway, a guide device that engages with the guide rail, and a car to which the guide device is attached and moves up and down guided by the guide rail, the car An auxiliary weight is attached to a lower frame member of the car frame that supports the car chamber of the car and to which the guide device is attached, at a position below the center of gravity of the car and symmetrical to the center, and the auxiliary weight An elevator characterized in that the elevator has a shape that can be removably fitted into and engaged with the lower frame member. 7. An elevator having a guide rail installed vertically in a hoistway, a guide device that engages with the guide rail, and a car to which the guide device is attached and moves up and down guided by the guide rail, the car The car frame supporting the car and to which the guide device is attached has a lower frame consisting of two parallel horizontal members spaced apart from each other, and a horizontal direction is provided at the upper part in the space between the two horizontal members. An elevator characterized in that a plate-shaped auxiliary weight having a protrusion is fixed by placing the protrusion on the upper part of the horizontal member. 8. In the vibration isolation method for an elevator, the elevator car engages with a guide rail erected in a hoistway via a guide device and prevents horizontal vibration of a car that moves up and down along the guide rail. A vibration isolation method for an elevator, comprising: attaching an auxiliary weight in a plane connecting two guide rails erected with the car in between, and at a position below the center of gravity of the car. .