JPH05132261A - Hanging device of elevator cage - Google Patents

Abstract

PURPOSE:To obtain good riding quality in a simple structure by reducing the extent of vertical vibration in an elevator cage due to the rolling of a main rope. CONSTITUTION:An end of a main rope 2 hanging a cage is engaged with a connecting body 16, and there is provided a displacement mechanism 20 displacing the cage and this connecting body relatively up and down. In addition, with output of a detector 21 emitting its output in accordance with vibration in the vertical direction of the cage, the displacement mechanism 20 is operated in a direction of offsetting the vibro-displacement. In succession, any vertical displacement of the cage to the space is checked, through which any effect due to the vertical vibration of a lower end of the main rope 2 attributable to rolling of the main rope 2 is abated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for an elevator car which is lifted and lowered by a main rope.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a conventional elevator car suspension device disclosed in, for example, Japanese Patent Laid-Open No. 3-51279. In the figure, (1) is a car, (2) is a main rope that suspends and suspends the cage (1), (3) is an inclination angle sensor mounted near the lower end of the main rope (2), (4) Is a clamp attached to the lower end of the main rope (2) and bundles multiple main ropes (2), (5) and (6) are auxiliary ropes, and (7) to (10) are cages (1) respectively. Pulleys pivotally attached to the four corners of the pulley, with both ends clamped to the pulleys (7) (8)
The intermediate portion of the auxiliary rope (5) connected to (4) is wrapped around, and the intermediate portion of the auxiliary rope (6) whose both ends are connected to the clamp (4) is wound around the pulleys (9) and (10). It is wrapped around. (1
1) is an actuator having an operating arm (12) attached to the car (1) and the middle of the auxiliary rope (5) is connected, and (13) is also attached to the car (1) and the auxiliary rope (6) It is an actuator having an actuator arm (14) connected in the middle.

The conventional elevator car suspension device is constructed as described above, and the swing of the main rope (2) is detected by the inclination angle sensor (3). Then, with the projecting inclination angles A and B of the main rope (2) being swaying as feedback inputs, the auxiliary ropes are moved by the actuators (11) and (13) in the directions in which the projection inclination angles A and B become zero.
(5) Automatic control for driving the clamp (4) in the horizontal direction is performed via (6). As a result, the clamp (4) apparently moves in the direction of the swing of the main rope (2) in a straightforward manner, and absorbs the vibration energy of the main rope (2). In this way, the main rope (2)
Sway is suppressed.

It is known that in a so-called flexible super high-rise building, an earthquake or strong wind causes the building to roll in its natural period. At that time, the main rope (2) of the elevator is vibrated at the upper end due to the horizontal vibration of the machine room on the top floor, and the passage of the resonance region due to the change in the length of the main rope (2) as the car (1) moves up and down, In some cases, it vibrates greatly due to the accumulation of vibration energy. For this reason, the main rope (2) is damaged by being caught in the hoistway equipment, and the main rope is displaced from rolling.
(2) Vertical vibration of the lower end causes problems such as deterioration of the riding comfort of the car (1).

[0005]

The conventional elevator car suspension device as described above is effective for absorbing vibration energy because it is constructed for the purpose of suppressing the vibration of the main rope itself. However, there is a problem in that the device becomes large and mounting is difficult.

Incidentally, the problem caused by the sway of the main rope cannot always be solved only by suppressing the sway itself. There are two main problems due to the shaking of the main rope: (a) damage caused by the main rope being caught on the equipment in the hoistway, and (ii) deterioration of the ride comfort due to the vertical vibration of the car induced by the rolling of the main rope. Is. Among them, as for the preventive measure (a), it is practically effective to protect the surroundings of the equipment in the hoistway with a wire net, a wire, etc., and it has been widely practiced conventionally. Therefore, if the measures for (a) are taken, the problem of the main sway will be solved.

The present invention has been made in order to solve the above problems, and an object of the present invention is to obtain a suspension device for an elevator car, which has a simple structure and reduces vertical vibrations of the car due to the rolling of the main ropes. To aim.

[0008]

In the elevator car suspension device according to the present invention, between the connecting body in which the ends of the main ropes for suspending the car are engaged, and between the car and the connecting body. A displacement mechanism that is provided to relatively displace both of the above and below, a detection device that is provided to the car and that outputs an output according to vertical vibration, and an output of this detection device operates to cancel the vibration displacement of the output. And a controller for instructing the displacement mechanism to perform a directional operation.

[0009]

In the elevator car suspension device constructed as described above, the displacement mechanism is urged when the car vertically vibrates. Then, the connecting body is displaced with respect to the car in a direction opposite to the vertical displacement due to the vibration of the car.

[0010]

1 and 2 are views showing an embodiment of the present invention, in which the same reference numerals as those in FIG. 3 indicate corresponding parts, (1a) is a frame of a car (1), and (15) Is a rope stopper connected to the end of the main rope (2), (1
6) is a connecting body which is arranged under the frame (1a) and in which the rope stopper (15) is inserted, (17) is a spring fitted to the insertion end of the rope stopper (15), and (18) is a rope. Screw the spring (1) into the insertion end of the stopper (15).
Nuts facing the end face on the side of the anti-main rope (2) of (7), (19) are provided near the both edges of the connecting body (16), respectively, and are arranged between the frame (1a) and the connecting body (16). The compressed coil springs (20) are provided in parallel in correspondence with the respective compression coil springs (19), and the frame (1
A displacement mechanism arranged between a) and the connecting body (16), which is composed of an electric cylinder or the like. (21) is a vibrometer installed in the frame (1a), which is a detection device that outputs an output according to the vertical vibration of the car (1), and (22) is a displacement mechanism (20) and a detection device (2
It is a control device connected to 1).

In the elevator car suspension device configured as described above, the vertical vibration of the car (1), that is, the frame (1a) is converted into an electric signal by the detection device (21) and output. It This output is input to the control device (22) and is processed, and the car (1) corresponding to the output of the detection device (21)
The displacement mechanism (20) is instructed to move in the direction to cancel the vibration displacement of the. As a result, the displacement mechanism (20) operates and the car (1)
On the other hand, the coupling body (16) is displaced in the direction opposite to the vertical displacement due to the vibration of the car (1), and the vertical displacement of the car (1) with respect to the space is suppressed. Therefore, the vertical movement of the car (1) caused by the vertical vibration of the lower end portion due to the shaking of the main rope (1) is reduced, and a good ride comfort can be maintained with a simple device configuration. In the embodiment of FIGS. 1 and 2, the weight of the car (1) is supported by the compression coil spring (19) so that the displacement mechanism (20) is not subjected to the load of the weight of the car (1). ing.

In the embodiments of FIGS. 1 and 2, the frequency characteristics of the detection device (21) are not mentioned, but
The vertical vibration frequency at the lower end of (2) is twice the chordal rolling natural frequency of the main rope (2) and can be calculated by the following formula.

[0013]

[Equation 1] Here, S: tension of the main rope g: acceleration of gravity r: weight of the unit length of the main rope l: length of the main rope f: frequency of vertical vibration of the lower end of the main rope

This value is about 0.5 hertz when the car (1) is near the bottom floor, and about 5 hertz when the car (1) is near the top floor, if the conditions of an ordinary elevator for a high-rise building are applied. is there. Therefore, it is effective to increase the sensitivity of the detection device (21) in the frequency range of 0.5 to 5 hertz.

[0015]

As described above, the present invention is provided between both the car and the connecting body with which the end of the main rope for suspending the car is engaged, and the connecting body and the connecting body. A displacement mechanism for performing relative displacement, a detection device that is provided in the car and that outputs an output according to vertical vibration, and an operation in a direction that cancels the vibration displacement of the output by operating by the output of this detection device to the displacement mechanism. A control device for instructing is provided.
Then, the displacement mechanism is urged by the vertical vibration of the car via the control device, and the coupling body is displaced in the direction opposite to the vertical displacement of the car due to the vibration of the car. As a result, the vertical displacement of the car with respect to the space is suppressed, and the vertical movement of the car due to the vertical oscillation of the lower end of the main rope due to the lateral vibration of the main rope is reduced, and there is an effect of maintaining a good ride comfort with a simple configuration. ..

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a perspective view showing a hanging state of a car.

FIG. 2 is an enlarged front view of a connecting body portion of FIG.

FIG. 3 is a diagram showing a conventional elevator car suspension situation.
Corresponding figure.

[Explanation of symbols]

 1 Cage 2 Main rope 16 Connected body 20 Displacement mechanism 21 Detection device 22 Control device

Claims (2)

[Claims] 1. A connecting body with which an end of a main rope for suspending a car is engaged, a displacement mechanism provided between both the car and the connecting body for vertically displacing the both, and A detection device provided on the car and emitting an output according to the vertical vibration, and a control device that operates by the output of the detection device to instruct the displacement mechanism to perform an operation in a direction to cancel the vibration displacement of the output. Lifting device for the equipped elevator car. 2. A connecting body with which an end of a main rope for suspending a car is engaged, and a displacement mechanism provided between both the car and the connecting body for vertically displacing the both. It consists of a vibrometer that has the highest sensitivity to vertical vibrations in the frequency range of .5 Hertz to 5 Hertz, and is installed in the above-mentioned car and outputs an output according to vertical vibrations. And a suspension device for an elevator car, which comprises a control device for instructing the displacement mechanism to perform an operation in a direction of canceling the vibration displacement of the output.