JPS623750B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for detecting the mutual positions of elevator cars.

Conventionally, a mechanical mutual position detection device shown in FIG. 1 has been known. In the figure, 1a is the hoisting motor for the No. 1 machine, 1b is the hoisting motor for the No. 2 machine (hereinafter, the one for the first machine is indicated by the subscript a, and the one for the second machine is indicated by the subscript b), 2
a, 2b are sheaves, 3a, 3b are deflection wheels, 4a,
4b is a basket, 5a, 5b are counterweights, 6
a and 6b are the main ropes, 7 is a differential gear in which the rotation of the deflection wheels 3a and 3b is transmitted by a chain and rotates by the differential between the two, 8 is driven by the differential gear 7, and
This is a mutual position detector that detects the relative position of the machine.

When both No. 1 and No. 2 are operating normally, they are transporting passengers in response to their respective car calls or assigned landing calls, but even during this time, the mutual position detector 8 constantly monitors the relative positions of the two. Detected.

Now, for example, if Unit 1 malfunctions and stops halfway between floors, a rescue worker can get into Unit 2 and
They head to rescue the passengers of Unit 1, but the stopping position of Unit 1 is detected by the mutual position detector 8,
Unit 2 automatically decelerates near the stop position of Unit 1.
Stop.

However, the mechanical mutual position detector 8 described above has the following drawbacks.

(a) Since it is mechanical, the device is large, requires a large amount of space in the machine room, and is extremely expensive.

(b) Since it is mechanical, maintenance and inspection costs are high.

(c) Position detection accuracy is not very good due to gaps between each mechanical component and errors due to scaling of the lifting and lowering strokes.

This invention solves the above-mentioned drawbacks, and aims to provide an inexpensive and highly accurate mutual position detection device for elevators with a simple circuit configuration.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In the figure, 11a and 11b are central processing units (hereinafter referred to as CPUs) that constitute electronic computers such as microcomputers, 12a and 12b are address and data buses, and 13a is a read-only memory that stores programs and fixed value data. (below
14a is a read/write memory (hereinafter referred to as RAM) that stores data such as calculation results;
15a is a speed command device that issues a speed command signal from the calculation result of the CPU 11a, 16a is a speed control device that operates according to the speed command signal, 17a is a three-phase AC power source, and 18a is an AC power source connected to the speed control device 16a. 19a is a rope formed into an endless shape with both ends connected to the cage 4a; 20a is a tension wheel around which the rope 19a is wound and gives downward tension; 2
1a is a disk around which a rope 19a is wound and pores are bored at equal intervals; 22a is a pulse generator that detects the pores of the disk 21a and generates pulses;
22b is a similar pulse generator; 23a and 23b are first addition/subtraction counters that count the pulses and send them to the electronic computer; 24a is a preset signal given from the electronic computer to the first addition/subtraction counter 23a; 24b Similar preset signal, 25
a is a cam attached to the car 4a; 26a is a position setting device consisting of a switch provided on the main floor (usually the first floor) and engages with the cam 25a when the car 4a reaches the main floor; 26b is a similar position Setting device, 27a,
27b is the output of the main floor signal, 28a, 28b
are second addition/subtraction counters connected to the pulse generators 22a, 22b, respectively, and their addition/subtraction operations and modification of counting contents are not controlled by any of the electronic computers (CPUs 11a, 11b) and are performed by the main controller. The content of the count is only modified and controlled by the floor signals 27a and 27b. 29
a, 29b are the outputs of the addition/subtraction counters 28a, 28b and are car position signals. Other symbols are the same as in FIG.

Next, the operation of this embodiment will be explained.

When a command is given from the CPU 11a to the speed command device 15a, the speed command device 15a issues a speed command signal, and the speed control device 16a operates to control the thyristor converter 18a. As a result, the electric motor 1a rotates, and the car 4a travels via the sheave 2a. When the car 4a runs, the rope 19a
The disk 21a rotates via the pulse generator 22
a generates a number of pulses corresponding to the amount of movement of the car 4a. The first addition/subtraction counter 23a is connected to the car 4a.
When the pulse is in the upward direction, the pulse is added, and when it is in the downward direction, the pulse is subtracted and transmitted to the CPU 11a. CPU1
1a calculates the output of the addition/subtraction counter 23a to detect the position of the car 4a, and the ROM 13a and
A speed command value is calculated from the data in the RAM 14a and the command is given to the speed command device 15a. As described above, the speed of the car 4a is controlled with high accuracy.

Note that the second addition/subtraction counter 28a also adds and subtracts the pulses from the pulse generator 22a, and sends a car position signal 29a to the computer of the second car.
However, under normal conditions, the CPU 11b of the second car does not take in this car position signal 29a. Similarly, in the second car, the addition/subtraction counter 28b converts the car position signal 29b to 1.
It is sent to the electronic computer of the first machine, but
The CPU 11a does not take this in. Also, when the car 4a of the first car arrives at the main floor, the cam 25a
The position setting device 26a is engaged with the position setting device 26a.
emits the main floor signal 27a. As a result, even if the contents of the addition/subtraction counter 28a are out of order, they are corrected to a value correctly corresponding to the main floor position. Similarly, in the case of the second car, the contents of the addition/subtraction counter 28b are corrected by the main floor signal 27.

Suppose that a failure occurs in car No. 1 and car 4a stops between floors. When the No. 2 car is designated as the rescue car, the CPU 11b of the No. 2 car receives the car position signal 29a of the No. 1 car, detects the stop position of the car 4a, and sets this as the target position of the car No. 2. He will go to the rescue. The same explanation can be given to the case where Unit 2 breaks down and Unit 1 goes to the rescue.

The first addition/subtraction counter 23a is used for normal running as described above, and its contents are preset by the preset signal 24a when necessary. For example, the addition/subtraction counter 2 may be set to the initial state before starting the first run after the power is turned on, or for some reason.
When a deviation occurs between the position of the car 3a and the actual position of the car 4a, it is corrected to the correct value. Therefore, if the cause of the failure is caused by the CPU 11a, there is no guarantee that the addition/subtraction counter 23a is showing the correct value. However, in the event of a failure, the output of the addition/subtraction counter 23a is not taken in, but the output 29a of the addition/subtraction counter 28a, which is corrected each time the car arrives at the main floor, is taken in, so the stopping position of the car 4a of No. 1 is accurate. detected. The same is true for Unit 2.

In the example, we explained the case where there is only one failed car, but it can also be applied when cars No. 1 to No. 3 are installed side by side, and No. 1 and No. 3 fail, and No. 2 in the middle goes to the rescue. It goes without saying that it can be done.

Further, the presetting of the second addition/subtraction counters 28a, 28b is not limited to the main floor signals 27a, 27b, but also the top floor signals, bottom floor signals, etc.
Anything is fine as long as it is independent from a and 11b.

As described above, the present invention provides a second counter separate from the first counter used in normal operation under the control of an electronic computer, and operates this counter when the car is in a predetermined position. The second counter is configured so that it is not controlled by an electronic computer, and is reset by a position setting device to match the car position. Therefore, even if the electronic computer goes out of control, a correct car position signal can be sent to other adjacent cars, allowing highly reliable rescue operation.

Furthermore, it is sufficient to simply add a second counter or the like to a normal control device, and the circuit can be constructed with high accuracy, small size, and low cost with a simple circuit configuration.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional elevator mutual position detection device, FIG. 2 is a configuration diagram of the first elevator showing an embodiment of the elevator mutual position detection device according to the present invention, and FIG. FIG. 2 is a block diagram showing the relationship of the No. 2 machine. 4a, 4b...cars of Unit 1 and Unit 2, 11
a, 11b... Same CPU on the left, 21a... Disk of Unit 1, 22a, 22b... Pulse generators of Units 1 and 2, 23a, 23b... Same as left first addition/subtraction counter, 25... Unit 1 cam, 26a, 26
b... Position setting device of Unit 1 and Unit 2, 28a,
28b...Second addition/subtraction counter on the left. Note that the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. In a device for detecting the mutual positions of a plurality of adjacently installed cars, a pulse generating means that generates a number of pulse signals corresponding to the amount of movement of one car;
A first counter that counts the pulse signal from the pulse generating means, and calculates the position of the one car based on the counting result of the first counter, and also calculates the counting result of the first counter when necessary. An electronic computer for resetting to a predetermined value, counting the pulse signal from the pulse generating means, transmitting the result to an electronic computer in another adjacent car, and controlling the counting operation from any of the above electronic computers. a second counter that does not receive a signal, and is provided corresponding to a predetermined floor, and is positioned so that when the one car is on the predetermined floor, the contents of the second counter match the value corresponding to the predetermined floor position. A mutual position detection device for an elevator, characterized in that it is equipped with a device.