JPH07206278A - Vibration absorbing device for elevator car - Google Patents

Abstract

PURPOSE:To solve a problem of transmission of vibration to a car via a rope or a guide roller so as to improve riding comfort of an elevator and so as to loosen the precision required for the construction of the guide rail. CONSTITUTION:A car frame 1 of an elevator car, a cage side plate 2A, and a cage floor 2B are movably separated, and the cage side plate 2A and the cage floor 2B are individually put on the first elastic body 3A and the second elastic body 3B, while an electromagnet 5 acting on the car frame 1 and the cage floor 2B, a control circuit 6 controlling the electromagnet 5, and a cage floor vibration detecting means 7 are arranged. In the control circuit 6 controlling the electromagnet 5, a gain phase regulator 9 and a bias current setting circuit 8 are arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator car, and more particularly to a vibration absorbing device for a cab.

[0002]

2. Description of the Related Art It is generally well known to use an elastic body (anti-vibration rubber) between a lower part of a car room and a car frame in order to suppress a longitudinal vibration in the car room. However, the vibration frequency transmitted from the ropes and the guide rollers to the car reaches several Hz to several tens Hz, and it is difficult to attenuate all the vibrations with only the vibration-proof rubber. Therefore, various methods have been proposed. For example, there is a system in which an anti-vibration rubber and an electromagnet are provided side by side to actively control the electromagnet (JP-A-63-306183).

[0003]

However, in the prior art in which the anti-vibration rubber and the electromagnet are provided together, since the entire cab room is mechanically driven, a large electromagnetic force is required, and the electromagnet device becomes large, resulting in power consumption. Grows larger. In addition, there have been few studies on mounting, such as the use of permanent magnets for the electromagnet core to suppress vibration.

An object of the present invention is to reduce the size and weight of an electromagnet to save electric power, and to improve the riding comfort of an elevator and reduce the accuracy of laying work of a guide rail by a control system having a high vibration suppressing effect. .

[0005]

[Means for Solving the Problems] The purpose is to divide a car room floor and a car room side plate of a car room so that the car room side plate is on a first elastic body and a car room floor is a second room. An electromagnet that is separately provided on the elastic body and that acts on the car frame and the car room floor,
A means for controlling the electromagnet and a car room floor vibration detecting means are installed. It is also achieved by providing a bias current setting circuit in the means for controlling the electromagnet.

[0006]

In the car room side plate, the vibration of the car frame is reduced by the first elastic body. The car room floor performs vibration suppression control by adding the vibration of the car room floor to the control circuit that controls the vibration of the car frame with the second elastic body and the electromagnet that acts between the car frame,
Transmission vibrations from ropes and guide rollers are suppressed.

In addition, in order to effectively suppress the vibration by the electromagnet, a bias current is applied to the electromagnet control circuit so that the vibration waveform of the car room floor that enters and exits the control circuit and the electromagnetic force waveform component of the electromagnet become the same. To act on.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional view of the present invention. In FIG. 1, 1 is a car frame, 2 is a car room, 2A is a car room side plate, and 2B.
The floor of the basket room, 3A is a first elastic body (anti-vibration rubber), 3B is a second elastic body (anti-vibration rubber), 4 is a bracket, 5 is an electromagnet consisting of an iron core and a coil, 6 is an electromagnet control circuit, Reference numeral 7 is a vibration detector, and 8 is a bias current setting circuit.

The car frame 1 is suspended by a rope (not shown), and a guide roller (not shown) is attached to the car frame 1, so that the car frame 1 runs along the guide rail. Therefore, if the laying accuracy of the guide rail is poor, the car frame 1 is vibrated through the guide roller and the torque pulsation of the motor through the rope. In the conventional device, there is an elastic body (anti-vibration rubber) between the car frame 1 and the car room 2, but vibrations of several Hz to several tens of Hz are not always suppressed and are transmitted to the car room 2 to make passengers uncomfortable. Was there.

In FIG. 1, the car room 2 is a car room side plate 2A.
The car room floor 2B is movably divided, and the car room side plate 2A is fixed on an elastic body (anti-vibration rubber) 3A.
In addition, the car room floor 2B is fixed on an elastic body (anti-vibration rubber) 3B, and further, the electromagnet 5 is provided so as to act between the car room floor 2B and the car frame 1.
Are attached using the bracket 4 so as to reduce the deflection of the elastic body (anti-vibration rubber) 3B, that is, the gap δ between the electromagnet 5 and the car frame 1 is reduced. In this way, the electromagnet 5 does not act on the cab side plate 2A, but only needs to generate an electromagnetic force with respect to the cab floor 2B and the weight of the passengers, which enables downsizing and power saving.

Next, the longitudinal vibration of the car room floor 2B transmitted from the car frame 2A is detected by a vibration detector (acceleration sensor etc.) 7 and applied to the electromagnet control circuit 6 to control the electromagnetic force of the electromagnet 5. Vibration of the car room floor 2B is reduced. Further, by installing the gain phase adjuster 9 at the output of the acceleration sensor 7 and setting it to an appropriate constant, the vibration of the car room floor 2B can be effectively reduced. Further, the constant of the gain phase adjuster 9 is changed according to the load of the cab 2 or the traveling position of the car. With this configuration, the vibration of the cab floor 2B can be favorably reduced against the vibration that changes depending on the number of passengers and the rope length.

Next, good vibration suppression control of the electromagnet will be described. The relationship between the electromagnet coil current and the electromagnetic force when the iron core of the electromagnet is a normal iron core having no magnetic force like a permanent magnet is as shown in FIG. FIG. 2A shows a case where a positive and negative polarity current is applied to the electromagnet coil, and the electromagnetic force of the electromagnet is always only one-way attraction force. Even if the vibration detection value of the floor of the cab is input and output with such a circuit to suppress the vibration, the suppression effect is small. FIG. 2B shows the relationship between the coil current and the electromagnetic force when the vibration detection value is input in the state where the bias current setting circuit 8 gives a command to the electromagnet control circuit 6 and an appropriate bias current flows in the electromagnet coil. ing. The electromagnetic force has the same wave as the coil current waveform.
It can be seen that if the control circuit having such characteristics is provided with the vibration detection value of the car room floor 2B, good vibration can be suppressed. The value of this bias current may be given in advance as a constant value that can always satisfy the suppression control in consideration of the vibration suppression state. However, as shown in FIG. 3, the load detector 10 detects the cab weight. And bias current setting circuit 8
In addition to the above, the bias current is set so as to be changed according to the size of the cab room, and the amplitude is detected by the vibration amplitude of the cab floor and the amplitude is set in the bias current setting circuit 8. Power saving may be achieved as a system in which the bias current is set so as to change according to the magnitude of the vibration amplitude.

FIG. 4 shows the installation location of the electromagnet. That is, in the car frame 1 suspended by the rope 11 and the car room 2 placed on it, the car room side plates 2A are fixed on the left and right elastic bodies 3AL, 3AR, and the car room floor 2
B is fixed on the left and right elastic bodies 3BL and 3BR, and the electromagnets 5L and 5R are further made to act on the car frame 1. Further, although not shown, the elastic body 3B and the electromagnet 5 may be installed on the lower side of the car. Also, set the electromagnet 5 to 1
It may be installed near the center of the bottom of the basket.

Next, the vibration suppressing period of the car room floor 2B by the electromagnet 5 will be examined with reference to FIG. For example, Example 1 is a method of controlling the electromagnet 5 so as to suppress the vibration of the cab floor 2B while the elevator is traveling. In addition, in Example 2, the vibration of the car floor 2B is suppressed during the traveling of the elevator and during a predetermined period before and after the traveling (in the figure, the period from when the door starts to close until it finishes opening) may be in the middle thereof. This is a method of controlling the electromagnet so as to perform. In this way, when the elevator is stopped, the vibration suppression control of the car room floor 2B is stopped to save power.

[0016]

According to the present invention, it is possible to prevent the vibrations from the ropes and the guide rollers from being transmitted to the floor of the cab. As a result, the riding comfort of the elevator can be improved. In addition, the accuracy of laying the guide rails can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an electromagnetic force characteristic diagram of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of an embodiment of the present invention.

FIG. 4 is an explanatory diagram of an electromagnet according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an electromagnet control period according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Car frame, 2 ... Car room, 2A ... Car room side plate, 2B ... Car room floor, 3A, 3B ... Elastic body (anti-vibration rubber), 4 ... Bracket, 5 ... Electromagnet, 6 ... Electromagnet control circuit, 7 ... Vibration detector, 8 ... Bias current setting circuit, 9 ... Gain phase adjuster, 11 ... Rope.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Okada 1-6 Kandanishiki-cho, Chiyoda-ku, Tokyo Within Hitachi Building System Service Co., Ltd. (72) Inventor Masahiro Kontani 1-chome Kandanishiki-cho, Chiyoda-ku, Tokyo Incorporated company Hitachi Building Systems Service (72) Inventor Hiromi Inaba 7-1-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Masayuki Shigeta 1070 Ige, Katsuta City, Ibaraki Prefecture Hitachi Ltd. Mito Factory

Claims (8)

[Claims] 1. A car frame for an elevator, a first elastic body acting on a side plate of a car room placed on the car frame, a second elastic body acting on a car room floor, the car frame and the car frame. An electromagnet that acts between the floors of the car room, a control circuit that controls the electromagnets, and a vibration detector that detects vibrations of the car room floor, and a control circuit that controls the electromagnets detects vibrations of the car room floors. An elevator car vibration absorber that is characterized by adding the output of a container. 2. The elevator car vibration absorber according to claim 1, wherein one or more of the second elastic body and the electromagnet are used below the cab. 3. The elevator car vibration absorbing device according to claim 1, wherein the electromagnet is installed in a direction to correct the deflection of the second elastic body due to the weight of the car room. 4. The elevator car vibration absorber according to claim 1, further comprising a bias current setting circuit for applying a predetermined bias current to a control circuit for controlling the electromagnet. 5. The elevator car vibration absorber according to claim 1, wherein the magnitude of the bias current is changed according to the weight of the cab. 6. The elevator car vibration absorber according to claim 1, wherein the magnitude of the bias current is changed according to the magnitude of the vibration of the cab. 7. The elevator car vibration absorber according to claim 1, wherein a vibration suppression control period of the car room floor by the electromagnet is a preset predetermined period. 8. The elevator car vibration absorber according to claim 1, wherein an elevator is traveling during the vibration suppression control period of the car room floor by the electromagnet.