JPS6124303B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for stopping an elevator at a terminal floor.

As is well known, the speed of an elevator is controlled by a speed pattern, but if an abnormality occurs in the regular pattern and the value does not decrease even when it reaches the terminal floor, it switches to another speed pattern. The car is decelerated and safely landed on the terminal floor. The operation is shown in FIG.

That is, 11a is a regular pattern, and the terminal floor C
Nearby it becomes ABC. 12a is the first pattern, which, like DEFGHIC, connects positions F to I that are sequentially lower from position E, which is a certain distance before the terminal floor C, in a step-like manner, and always has a value larger than that of regular pattern 11a. ing. The speed of the car is controlled according to the regular pattern 11a, and unless there is an abnormality in the regular pattern 11a, the car decelerates along this pattern and lands on the terminal floor C. If regular pattern 1
If an abnormality occurs in the speed pattern 1a and the speed does not decrease even after passing the normal deceleration command point B and reaches a point B' where it intersects with the first pattern 12a, the speed pattern becomes the normal pattern 11.
A is switched to the first pattern 12a, the car is decelerated along BB'FGHIC, and landed on the terminal floor C. Note that the positions E, F, G...I are set by switches or the like installed at actual positions in the hoistway. In this way, even if the regular pattern 11a becomes abnormal due to equipment failure, the car is protected so that it can accurately land on the terminal floor C.

However, since the first pattern 12a is a step-like pattern, a large number of set positions E, F, G, . . . are required to detect abnormalities in the regular pattern 11a with high accuracy. Further, since the first pattern 12a is step-like, the speed of the car according to this speed pattern lacks smoothness, resulting in poor riding comfort.

In order to improve this, the details will be described later, but as shown in FIG. 2, it is possible to generate a third pattern 16a that temporally approaches the second pattern 15a having the same value as the first pattern 12a. It is considered. As a result, the third pattern 16a can be brought sufficiently close to the regular pattern 11a as a whole just by providing a small number of position detection points,
It becomes possible to obtain a safe speed pattern. Then, while the car is running, an abnormality occurs in the regular pattern 11a, and the deceleration does not decrease even after passing the regular deceleration command point.
Proceeding to point B', the second pattern 15a becomes a stepped velocity pattern like DEB'F'G'H'I'C in FIG. 3, and the third pattern 16a becomes DEB'JH'K.
The speed pattern becomes asymptotic in time to the second pattern 15a as shown in FIG. Thereafter, the car smoothly decelerates according to this third pattern 16a and lands on the terminal floor C.

However, as shown in FIG. 4, when the normal pattern 11a in the accelerated state exceeds the third pattern 16a at point B' and the speed pattern is switched to the third pattern 16a, the speed pattern will suddenly change. Become. As a result, the acceleration of the car overshoots as shown in curve a, which not only makes passengers in the car feel uncomfortable and uneasy, but also causes a large current to flow through the hoisting motor, causing the motor capacity to be increased more than necessary. Must. Note that 7a in the figure indicates the speed of the car.

The present invention aims to improve the above-mentioned problems, and aims to provide a terminal floor stopping device for an elevator that prevents the acceleration of the car from becoming abnormally large when switching speed patterns.

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 5 to 7.

In the figure, 1 is the elevator car, 2 is the counterweight, 3 is the main rope, 4 is the sheave around which the main rope 3 is wrapped, and 5
6 is the armature of the hoisting motor that drives the sheave 4; 6 is another exciting field; 7 is a speed detection device that is directly connected to the armature 5 and emits a speed signal 7a corresponding to the speed of the car 1; 8 is the armature 7; 9 is the field thereof; 10 is a field control device that controls the field 9; 11 is a regular pattern generator that emits the regular pattern 11a described above; 12 is the first pattern 12a. a first pattern generator that emits
3 compares the regular pattern 11a and the first pattern 12a, and compares the regular pattern 11a with the first pattern 12a.
The comparator outputs an output if a, and stops output if the normal pattern 11a is greater than the first pattern 12a. The comparator 14 is always energized by another circuit, and is deenergized when the comparator output disappears. 14a and 14b are normally open contacts, 14
c, 14d are normally closed contacts, 15 is a second pattern generator that emits the second pattern 15a, R1,
R2 is a resistor, 16 is a third pattern generator that emits the third pattern 16a, and 17 is the third pattern 16.
a and the second pattern 15a, and the third pattern 1
6a> A comparator that emits a positive output when the second pattern 15a is present and a negative output when the third pattern 16a is the second pattern 15a, R3 is a resistor, 18 is an integrator, C1 is a capacitor, 19 is an acceleration control circuit,
R4 to R7 are resistors, C2 and C3 are capacitors, D
1 is a diode, Tr is a transistor, and resistor R
4 and capacitor C2, the delay circuit is connected to contact 1.
4b, a transistor Tr, a diode D1, resistors R5 to R7, and a capacitor C3 constitute a switching circuit.

Next, the operation of this embodiment will be explained.

As shown in FIG. 2, when the normal pattern 11a and the first pattern 12a, that is, when the car 1 is normally operated, the abnormality detection relay 14 is energized, the contacts 14a and 14b are closed, and the contact 14
c and 14d are open. Therefore, the regular pattern 11a is given to the field control device 10, and the control device 10 controls the field 9 according to the regular pattern 11a.
control. As a result, the voltage generated by the armature 8 changes, so the speed of the armature 5, that is, the car 1
The speed of is controlled. This speed is determined by the speed detection device 7.
The speed signal 7a is negatively fed back to the field control device 10, and known automatic speed control is performed.

When the car 1 approaches the terminal floor C, the first pattern 12a descends in a stepwise manner as shown in FIG.
At this time, since the contact 14d is open, the second
The pattern 15a shows the same value as the first pattern 12a. When the second pattern 15a is input to the third pattern generator 16, the comparator 17 and the integrator 18 act to generate a third pattern 16 that temporally approaches the second pattern 15a as shown in FIG.
a is uttered. (Since R3≫R4 is selected, it is hardly affected by the delay circuit consisting of the codenser C2 and the resistor R4.) As a result, during deceleration, this third pattern 16a and the regular pattern 11
a will be compared by the comparator 13.

Next, as shown in FIG. 7, when the car 1 develops an abnormality in the normal pattern 11a during acceleration and does not decelerate even after passing the normal deceleration command point and advances to point B', the normal pattern 11a>3. This becomes pattern 16a. Now, the comparator 13 stops outputting, the abnormality detection relay 14 is deenergized, and the contacts 14a and 14b are opened.
Contacts 14c and 14d are closed. By closing the contact point 14d, the second pattern 15a becomes the first pattern 1.
2a becomes the value divided by the resistors R1 and R2, resulting in a stepped speed pattern like DEB'F'G'H'I'C in FIG. At the same time, since the contact 14b is opened, the capacitor C3 is connected to the resistors R5 to R7.
and the transistor Tr is charged at time t1
Conducts during. When the transistor Tr becomes non-conductive due to completion of charging of the capacitor C3, the charged capacitor C2 is discharged via the resistor R4 with a time constant t2, so that the acceleration control circuit output 19
a becomes as shown in FIG. Now, the second pattern 1
5a is due to the action of the comparator 17 and the integrator 18,
This becomes a third pattern 16a, which, as shown in FIG. 3, becomes a speed pattern that temporally approaches the second pattern 15a. Then, by opening the contact 14a and closing the contact 14c, the third pattern 16
a is input to the field control device 10 instead of the regular pattern 11a. During this time, as is clear from FIG. 7, the sudden change at the time of switching between the regular pattern 11a and the third pattern 16a at point B' has been eliminated, so the change in the speed 7a of car 1 is smooth. , the car 1 decelerates and lands on the terminal floor C without the acceleration a overshooting.

FIGS. 8 and 9 show other embodiments of the invention.

In FIG. 7, the car 1 is the regular pattern 11a
Therefore, the vehicle is operated according to AB', and when it reaches point B', it is switched to the third pattern 16a and starts running at the terminal floor. At this time, the time t1 after point B' not only does not contribute to deceleration in any way, but also causes car 1 to overshoot the terminal floor C.
This embodiment is designed to eliminate this dead time t1.

In the figure, R5' to R7' are resistors, C3' is a capacitor, D2 is a diode, 14b' is a contact similar to contact 14b, and 20 is a differentiator consisting of a capacitor C4, a resistor R8, a diode D3, and an operational amplifier 21. 20a is its output. The rest is the same as in FIG. 6.

Now, if the normal pattern 11a has an increase rate of zero (it may be negative) as shown in AB' in FIG. 9, the output 20a of the differentiator 20 is zero, so the potential at point P is also kept at zero. drooping Next, when the comparator 13 operates at point B' in FIG. 9 and the abnormality detection relay 14 is deenergized, the contacts 14b and 14b' are opened. At this time, the potential at point P is zero, but the capacitor C
3' is charged with a certain time constant via the resistors R5' to R7', so the transistor Tr is charged by the capacitor C
3' and the time t determined by resistors R5' to R7'
Conductive for 1'. Therefore, the acceleration control circuit output 19a becomes as shown in FIG. However, time t1' is set to be sufficiently smaller than time t1 in FIG.

Next, when the regular pattern 11a is in an accelerated state as shown in FIG. 7, the output 20a of the differentiator 20 becomes a positive value, so the point P is cut off by the diode D2. Therefore, the comparator 13 at point B'
When operated, the third pattern 16a in FIG. 7 is emitted as a speed pattern.

In this way, since the acceleration control circuit output 19a is controlled according to the rate of increase of the regular pattern 11a, the comparator 13 operates while the car 1 is running at a constant speed (or when it is decelerating) and stops at the terminal floor. Even when the vehicle is traveling, no abnormally large deceleration occurs. Moreover, since the time delay is short, the vehicle can decelerate sufficiently to land on the terminal floor C.

Note that in a control system with a slow response, the acceleration of car 1 may not overshoot even if the delay times t1' and t2' in FIG. 9 are zero. In this case, it is clear that resistors R5' to R7', capacitor C3', etc. are not required.

In addition, in order to increase deceleration margin, regular pattern 1
Only when 1a is in a deceleration state, the delay time t1',
There are times when it is desired to set t2' to zero. In this case, the 8th
The diode D3 of the differentiator 20 in the figure is omitted, and when the output of this differentiator 20 is negative, the transistor Tr
The circuit may be configured to prevent conduction.

As explained above, in this invention, when an abnormality occurs in the regular pattern for commanding the car speed and the switch is made to the terminal floor speed pattern, the acceleration of the car is controlled by reducing the rate of decrease of this terminal floor speed pattern. Therefore, the acceleration of the car does not become abnormally large when changing the speed pattern, and the discomfort and anxiety caused to passengers in the car can be alleviated.

In addition, when the rate of increase in the normal pattern immediately before switching the speed pattern is zero or negative, the control time for the rate of decrease in the terminal floor speed pattern is shortened, so the car changes from constant speed running or deceleration running to the terminal floor. The time delay when moving to a stop is reduced, and the terminal floor can be landed accurately.

[Brief explanation of the drawing]

1 to 3 are velocity pattern curve diagrams of a conventional elevator terminal floor stopping device, FIG. 4 is an operation explanatory diagram, and FIG. 5 is a configuration diagram showing an elevator terminal floor stopping device according to the present invention. Figure 6 is the fifth
The main part circuit diagram in the figure, Figure 7 is an operation explanatory diagram of Figure 6,
FIG. 8 is a circuit diagram of a main part showing another embodiment of the present invention, and FIG. 9 is an explanatory diagram of the operation of FIG. 8. 1... Car, 5... Armature of hoisting motor, 8...
... Generator armature, 9 ... Left field, 10 ... Field control device, 11 ... Regular pattern generator, 12
...First pattern generator, 13...Comparator, 1
4... Abnormality detection relay, 15... Second pattern generator, 16... Third pattern generator, 19...
...Acceleration control circuit. Note that the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. When an abnormality occurs in the regular pattern for commanding the speed of the car, and the value becomes larger than the terminal floor stop pattern which is set in advance to be larger than the regular pattern, the regular pattern is changed to the terminal floor stop pattern. In the car switching to a stop pattern, the car is decelerated accordingly and landed on the terminal floor, the first step decreasing in a stepwise manner as the terminal floor is approached.
A first pattern generator that generates a pattern. A comparator that compares the above normal pattern and the above terminal floor stop pattern and operates when the above normal pattern is larger, and when this comparator is not operating, outputs the above first pattern and operates the above comparator. a second pattern generator that reduces and outputs the first pattern when the first pattern is present; an acceleration control circuit that reduces the rate of decrease in the output of the second pattern generator for a predetermined period of time after the comparator is activated; A terminal floor of an elevator equipped with a third pattern generating device that receives the output of the second pattern generating device through the acceleration control circuit and generates a third pattern that temporally approaches this output as the terminal floor stop pattern. Stop device. 2. When an abnormality occurs in the regular pattern that commands the speed of the car and the value becomes larger than the terminal floor stop pattern, which is set in advance to be larger than this regular pattern, the regular pattern is switched to the terminal floor stop pattern and the above-mentioned In the car which is caused to decelerate accordingly and land on the terminal floor, the first step decreases in a stepwise manner as it approaches the terminal floor.
A first pattern generator that generates a pattern. A comparator that compares the above normal pattern and the above terminal floor stop pattern and operates when the above normal pattern is larger, and when this comparator is not operating, outputs the above first pattern and operates the above comparator. a second pattern generator that reduces and outputs the first pattern when the first pattern is present; an acceleration control circuit that reduces the rate of decrease in the output of the second pattern generator for a predetermined period of time after the comparator is activated; When the comparator detects that the increase rate of the normal pattern immediately before activation is zero or negative, the second pattern generator A terminal floor stopping device for an elevator, comprising a third pattern generating device which receives an output and generates a third pattern temporally approaching the output as the terminal floor stopping pattern.