JP2539553B2 - Fluid pressure elevator device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure elevator such as a hydraulic elevator and, more particularly, to an improvement of a fluid pressure elevator apparatus for detecting a car position or speed of an elevator by a detection device such as a counting car position and speed detection. .

[0002]

2. Description of the Related Art In this type of fluid pressure elevator, as a flow control valve for controlling its speed, a pilot circuit for controlling a main control valve is provided with a large number of throttle resistors, and the pilot valve is turned on in accordance with a preset sequence. OFF
However, the speed control is configured to perform fluid pressure sequential control. Japanese Patent Laid-Open No. 60-15379 has been proposed as a method for performing automatic speed control of this type of fluid pressure elevator. Further, as an example of a fluid pressure elevator control device which controls the acceleration / deceleration by moving the pilot valve in high speed / high frequency electric control in a nearly continuous manner, there is JP-A-60-213680.

[0003]

The position and speed detection of the car of a fluid pressure elevator are easily affected by vibrations caused by mischief of passengers in the car. For this reason, if the position and speed of the car are detected and control such as transition to landing travel is performed, the landing accuracy will decrease or the engine will restart due to an increase in the landing speed or stall due to the effect of vibration. There was a problem that needed.

An object of the present invention is to provide a fluid pressure elevator device capable of detecting a position or speed with high accuracy even if a passenger vibrates a car.

[0005]

The above object is achieved by utilizing the movement of the plunger for detecting the speed or the position of the car.

[0006]

The car position or speed detecting device of the fluid pressure elevator converts the vertical motion of the plunger into rotary motion as necessary, converts this rotary motion into a signal, further synthesizes this signal, and integrates the signals. By doing so, the position or speed is detected. Since the position or speed of the plunger is less affected by the vibration of the rope system than the position or speed of the car,
Even if the position or speed of the car changes significantly due to the vibration of passengers in the car, the speed of the plunger does not change much. Therefore, even if the passenger vibrates, the detected car position or speed does not significantly differ from the actual position or speed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of an embodiment of the present invention. The car 1 of the fluid pressure elevator is pulled up by the rope 5 and descends by its own weight when descending, but the rope 5 controls the descending speed. One end of the rope 5 is connected to the elevator car 1, passes through the sheave 4 attached to the upper end of the plunger 2, and the other end is fixed. The elevator car moves up and down as the plunger 2 in the cylinder 3 moves up and down by fluid pressure. In the conventional fluid pressure elevator, pulleys 7 and 8 are attached to the upper and lower ends of the guide rope 6 of the car, and one of the pulleys 7 and 8 is equipped with a counting car position or speed detection device to detect the car position or speed. To detect. In the case of a passenger elevator, when the passengers in the car move during operation, vibrations are added to the car and the pulleys 7, 8
Not only does the rotary motion linked to the operation of the elevator, but also makes sudden acceleration and deceleration motions due to the vibration of the car. Therefore,
In some cases, the rotational movement of the pulley may not be a continuous movement that is constant velocity or constant acceleration.
Sliding 8 does not accurately detect car position or speed.

According to the present invention, in order to solve this problem and detect a position or speed with high accuracy, a loop rope is attached to a plunger for moving the car up and down, and pulleys 9 and 10 are provided at the upper and lower ends thereof, and one of them is provided. Install a car position or speed detection device. Since the plunger and the car operate in conjunction with each other, and the plunger side is less affected by the vibration on the car side, the pulley continuously and smoothly rotates, so that the position or speed can be detected with high accuracy. FIG. 2 shows a counting type detector for detecting the car position or speed. A slit 51 is engraved on a disk 50 that rotates in conjunction with the pulley at the same speed,
When an optical signal 100 that maintains a constant value as shown in FIG. 3A is projected from one side of the disc, the optical signal passes or is blocked by the rotation of the disc having the slits.
A pulse wave as shown in (b) is formed. This pulse wave is incident on the receiver, and the position or velocity is detected by counting the pulse wave. As described above, it is possible to detect the position or speed with high accuracy even if the car is vibrated.

Here, the speed ratio of the car and the plunger is 2: 1. When the same detector is attached to both the plunger side and the car side, the number of detected pulses is 1: 2 and the pulse width is 1: 2. Therefore, when the same detector is used, the accuracy of the integrated number on the side of the plunger for counting is reduced.

Therefore, in order for the plunger side and the car side to detect the position or speed with the same accuracy in counting, the disk 50 is used.
The slit 51 width and the inter-slit distance are half and the number of slits is doubled. As a result, the position or speed can be detected without being affected by the vibration of the car and with the same accuracy in counting as in the conventional case.

However, according to this method, it is necessary to newly prepare a disk in which the slit width and the inter-slit width are cut in half. More precise machining technology is required than before to reduce the slit width and slit width to half.

Without using such a precise machining technique, it is possible to detect the equivalent position or velocity by applying the conventional technique. That is, conventionally, as shown in FIG. 3C, a two-phase pulse wave having different π / 4 phases is received and the traveling direction of the elevator is detected by the phase shift of the two-phase pulse signal. The position or velocity was detected by the pulse wave number. Applying this technology, the pulse width doubled when mounted on the plunger side, compensating for the fact that the counting accuracy was half that of the conventional method, and in order to perform equivalent detection, this two-phase pulse with different π / 4 phases The waves can be combined to halve the pulse width to achieve the same counting accuracy. As a means for synthesizing pulse waves, as shown in FIG. 4, two-phase waves are exclusively ORed. As described above, the detection accuracy can be improved by adding the logic gate to the circuit for calculating the position or the speed. Further, by adding an arithmetic circuit, a conventional mechanical detection device can be used.

Further, as shown in FIG. 5, this arithmetic circuit can be switched so that it can be used as follows. In a passenger elevator, there is vibration due to mischief of passengers, etc. If detection is performed on the car side, this will have an effect. On the other hand, a hydraulic elevator is used for luggage because it is advantageous for lifting heavy objects. Since there is no possibility that passengers will be excited in a luggage-only elevator, the detection device may be either on the car side or on the plunger side. It can be installed on the side with plenty of space. In this way, if the mechanical detection device for converting the elevator operation into a signal can switch the arithmetic circuit for accumulating the signals on both the car side and the plunger side, the program specifications for each detection method can be used.

[0014]

According to the present invention, even if the car of the elevator is vibrated by the mischief of a passenger, the position or speed of the car can be detected with high accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a fluid pressure elevator showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a position or speed detection device that converts an elevator operation into a pulse signal.

FIG. 3 is a waveform diagram of signals transmitted and received by the position or speed detection device.

FIG. 4 is a signal waveform diagram synthesized with a signal synthesis circuit.

FIG. 5 is a signal synthesis switching circuit diagram.

[Explanation of symbols]

1 ... Basket, 2 ... Plunger, 3 ... Cylinder, 4 ... Sheave, 5 ... Rope, 7, 8, 9, 10 ... Pulley, 50 ... Disk, 51 ... Slit.

Claims (2)

(57) [Claims] 1. A fluid pressure elevator comprising a plunger that moves up and down by fluid pressure, a rope that transmits power of the plunger, and a car that is connected to the rope and moves up and down, and two pulleys provided above and below a hoistway, respectively. these
The rope stretched between the two pulleys, and this rope and the front
Check the rotation of the pulley and the means for connecting the plunger.
And a fluid pressure elevator device provided with a discharging means . 2. The disk according to claim 1, wherein the disk is connected to the pulley and rotates, and a slit is provided in the disk to send a signal such as light having a certain intensity from a fixed point to the slit portion. A fluid pressure elevator apparatus comprising means for passing or blocking the signal at a non-slit portion to generate a pulse signal.