JPS6246478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration damping device for damping the vertical vibrations of an elevator, and is particularly suitable for damping the fluffy vertical vibrations of a passenger car due to the elongation of a rope in an elevator with a large stroke. This invention relates to a vibration damping device.

In general, as buildings become taller, the stroke of the elevator becomes longer, the overall length of the rope becomes significantly longer, the spring constant decreases, and especially when the car is near the bottom floor, the excitation force is increased by a small amount. It is known that even if this is added, the tendency of the car to vibrate up and down becomes noticeable.

This fluffy vibration is also induced by acceleration and deceleration by the hoist motor, and is harmful to the stability of the speed control system of the motor and the fixed point stop control of the elevator.

In addition, this fluffy vibration impairs riding comfort, and
This must be avoided as it can cause various troubles such as malfunctioning of the emergency stop governor.

Conventionally, a method to deal with this problem was to increase the number of ropes as the elevator stroke increases, thereby preventing the spring constant from decreasing when the car is at the maximum floor. There is a problem in that the number of wires increases even though there is no need for strength, which is uneconomical.

The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a vibration damping device for an elevator that actively damps vertical vibrations of a running car.

In order to achieve the above object, the present invention provides a vibration damping device for an elevator having a balancing rope, including a speed detection device that detects the speed of a car, and a damping torque that applies a damping torque to a pulley for the balancing rope. The application device controls the vibration damping torque applied by the vibration damping torque application device in response to the pulsation speed as the difference between the speed command signal of the hoisting machine electric motor and the speed of the car detected by the speed detection device. and a control device that controls the operation.

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

In Figure 1, 1 is a basket, 2 is a counterweight,
3 is the main rope, 4 is the floor of the machine room, 5 is the sheave of the hoisting machine installed in the machine room, 6 is the deflection wheel, and 8 is the balancing rope. This is to correct the weight imbalance caused by the difference in length between the side and the counterweight side. Balance ropes are always installed in elevators for skyscrapers.

Reference numeral 9 denotes a pulley for the balancing rope, which has the role of guiding the balancing rope 8 through the pit of the hoistway and applying an appropriate tension to the balancing rope 8 to prevent the rope 8 from swinging sideways. A bearing box (not shown) of a pulley 9 for a balancing rope is guided in the vertical direction by a guide rail (not shown) erected from the bottom 7 of the hoistway pit.

12 is a vibration damping motor used for the present invention, and has a built-in speed generator (not shown). This damping motor 12 is guided along a guide rail together with the bearing box of the above-mentioned balancing rope pulley 9.

10 is a V-groove pulley integrated with the balance rope pulley 9; 11 is a V-groove pulley mounted on the shaft of the damping motor 12; and 13 is a V-belt connecting these V-groove pulleys 10 and 11. It is.

Next, FIG. 2 is a speed curve, and in each of A, B, and C, the horizontal axis shows time and the vertical axis shows speed.

FIG. 2A shows the speed command of the elevator, and FIG. 2B shows the speed response of the car 1 during actual operation.

During the descending operation of the elevator, when the descent starts near the top floor, the length of the main rope 3 above car 1 is short, so the expansion and contraction of the rope is small, and the speed response of car 1 shown in Figure 2B is smooth. .

Furthermore, since the acceleration control described above has nothing to do with stable stopping accuracy, it does not need to be very precise. Therefore, there is no need to perform speed feedback control sensitively, and hunting does not occur in the transient response during acceleration control.

On the other hand, in the case of deceleration control when lowering and stopping car 1 near the bottom floor, the length of main rope 3 above car 1 is extremely long;
The amount of expansion and contraction becomes large, and even if the deceleration control of the sheave 5 of the hoisting machine is performed precisely, the transient response during deceleration of the car 1 tends to become disordered as shown in FIG. 2B.

Furthermore, during the above-mentioned deceleration, it is necessary to perform speed feedback control sensitively in order to improve fixed-point stopping accuracy, and the speed control system of the electric motor of the hoisting machine itself has a tendency to hunt as a response to input changes.
The tendency of the car 1 to hunt during deceleration is accelerated, and under a combination of bad conditions, undesirable fluffy vertical vibrations as shown in FIG. 2B occur during deceleration.

Car 1 vibrates up and down near the lowest floor. At this time, the length of the balancing rope is short, so the vibration of car 1 is relatively accurately transmitted as rotational pulsation of the balancing rope pulley to the damping motor 12. The built-in speed generator detects the speed shown in FIG. 2B.

By subtracting the speed command curve shown in FIG. 2A from the deceleration curve including this pulsation, only the pulsation speed of car 1 is obtained as shown in FIG. 2C.

The damping motor 12 is configured so that the torque proportional to the pulsation speed thus obtained acts in the opposite direction.
By controlling the torque, a braking force against the pulsation is generated, and the vertical vibrations of the car 1 are suppressed, thereby achieving the original purpose.

The advantage of the configuration of the present invention is that the distance between the pulley 9 and the car 1 is the closest near the bottom floor where fluffy vertical vibrations are likely to occur, and the damping motor 12 and the car 1 are connected with a high spring constant. In general, the moment of inertia of the pulley 9 is smaller than that of the sheave 5 to which the electric motor of the hoist is integrally connected, and the damping force of the damping motor 12 is reduced by minimizing the extra intermediate inertial mass. The key point is that it can be accurately conveyed to car 1 up close.

In addition, since the purpose of the damping motor 12 is only to apply damping torque, its capacity can be significantly smaller than that of the main motor of the hoisting machine. Therefore, the time constant of the speed control system of the damping motor 12 is A significantly shorter and more agile torque fluctuation response than that of a traction motor is possible. Therefore, it is possible to stably and accurately apply effective vibration damping torque to the car 1 without resonating with the soft vertical vibrations of the car 1 at a low frequency.

The timing of the present invention is advantageous for vibration damping when car 1 is near the bottom floor, and disadvantageous when car 1 is near the top floor. This is not a problem because the speed of car 1 can be stably controlled only by controlling the speed of the electric motor.

It is also a good idea to use the vibration damping device of the present invention only near the bottom floor, where it is good at.

The vibration damping device of the present invention is effective not only for damping the vertical vibration of the car during deceleration when the car 1 is near the lowest floor, but also for damping vibration during acceleration, running at rated speed, or after stopping. It is valid.

In the embodiment of the present application, a method of detecting the rotational speed of the balancing rope pulley 9 is shown as the speed detecting device for the car 1, but any other means may be used. To put it in an extreme case, the speed generator provided in the electric motor of the hoisting machine may be shared.

In this embodiment, the vibration damping motor 12 is used as the pulsating vibration damping torque application device, but if we focus on the fact that the function of this motor is exclusively to absorb vibration energy, it does not need to be a motor in particular; for example, a friction brake can be used. It may be made to act intermittently at a constant cycle. However, this case is not preferable from the viewpoint of energy saving.

As described above, the vibration damping device for an elevator according to the present invention has the effect of being able to satisfactorily damp the vertical vibration of the car.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the vibration damping device for an elevator according to the present invention, FIG. 2A is a diagram showing the speed command of the elevator, and FIG. 2B is a diagram showing the speed of the car.
FIG. 2C is a diagram showing the pulsation speed of the car. 1... Car, 3... Main rope, 8... Balancing rope, 12... Vibration damping motor.

Claims (1)

[Claims] 1. In a vibration damping device for an elevator having a balancing rope, a speed detection device for detecting the speed of the car;
The vibration damping torque application device applies vibration damping torque to the balancing rope pulley, and the pulsation speed is measured as the difference between the speed command signal of the hoist motor and the car speed detected by the speed detection device. and a control device for controlling the vibration damping torque applied by the vibration damping torque application device.