JPS587598B2 - Elevator door control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for controlling the opening and closing of elevator doors.

Typically, elevator car doors are driven to open and close by an electric motor.

Further, the landing door opens and closes in conjunction with the opening and closing of the car door.

FIG. 1 shows an example of a conventional car door opening/closing mechanism as viewed from the landing side.

In the figure, 1 is the car door, 2 is a roller pivotally attached to the top of the car door 1, 3 is a rail that guides the roller 2, and 4 is passed horizontally through a car frame member (not shown) above the car room. 5 is a motor installed on the cross member 4; 6 is a small chain gear fixed to the rotating shaft of the motor 5; 7 is an outer body of the motor 5; 8 is a chain wrapped around both button tooth weights 6 and 7,
9 is a drive arm driven by the dog button gear 7, 10 is a link pivotally connected to the drive arm 9 with a pin 11, and 12 is a cross member 4.
The link 15 is pivotally connected to the car door 1 by a pin 13 and the link 10 by a pin 14.
This is a link that is pivotally supported by the link 12 and is pivotally connected to the link 12 by a pin 17.

That is, the rotation of the shaft of the electric motor 5 is caused by the small button gear 6, the chain 8,
It is transmitted via the canine gear 7 and the drive arm 9 to the link 10, and further to the car door 1 via the link 12.15.

As a result, the rollers 2 are guided on the rails 3, and the car door 1 opens and closes from side to side.

When car door 1 is closed, a person may become caught between the car doorway and any part other than the safety device for automatically stopping or reversing the door provided at the front edge of car door 1, or when the door is open. If the movement of the car door 1, that is, the movement of the electric motor 5, is restricted due to a finger being caught between the car door 1 and the door pocket, the armature current increases and the person or person caught is Tighten your fingers with strong force.

This will be explained in more detail with reference to FIGS. 2a-c.

Assuming that the amount of movement of the drive arm 9 is S1 and the amount of movement of the car door 1 is S2, the value of the ratio S1/S2 is maximum at the fully open position and the fully closed position, as shown in Figure 2a, and at It is minimum at the position.

On the other hand, as shown in FIG. 6, the armature current or motor torque is small at the fully open position and the fully closed position, and is maximum at an intermediate position.

Therefore, the opening/closing force measured for door 1 of the car is C
As shown in , it is almost constant over the entire area.

Therefore, as mentioned above, when the door is caught in the fully open or fully closed position, the motor 5 is restrained and the armature current increases, and the tightening force remains at the same level as in the center as shown in C in the figure. It's strong and dangerous.

In addition, when performing non-return control on the speed of the car door, if a person is caught in the fully open or fully closed position of the door, the instruction to reach the target speed will be issued because car door 1 has stalled. given, the electric motor 5 will further increase the torque,
It's extremely dangerous.

This invention aims to improve the above-mentioned drawbacks, and is an elevator that limits the tightening force of the door so that the person who is caught in the door will not be harmed no matter where the person is caught in the opening/closing area of the door. The purpose of this invention is to provide a control device for a door.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

In Figure 3, (+) and (-) are DC power supplies, and 5a is the motor 5.
field, 5b is the armature, 20.21 is the resistance, 22
a, 22b, . . . 24a, 24b operate in the order of these numbers depending on the rotational position of the electric motor 5 between the fully open position and the fully closed position of the car door 1, in other words, the position of the car door 1. Door position contacts 22a, 22b, 23b, and 24b are open when fully opened, and 23a and 24a are closed.

25 is a door opening/closing condition circuit that closes when the door closing condition is met and opens when the door opening condition is met; 48a is the normally closed contact of the overcurrent detection relay 48 shown in FIG. 4; and 26 is the full open/close finger current relay. , 26a, 26b are normally open and normally closed contacts, 27 is a door opening relay, 27a, 27b are normally open contacts, 27
c and 27d are normally closed contacts, and 28 is a relay for closing the door.
28a and 28b are normally open contacts, 28c and 28d are normally closed contacts, 29 is a full open detection switch that closes from the fully closed position to just before the fully open position and opens at the fully open position, and 30 is from the fully open position to just before the fully closed position. A fully closed detection switch that closes and opens at the fully closed position, 2 to 35 are resistors, 36 and 37 are door position contacts similar to the door position contacts 23b and 24b, and the car door 1 is closed when fully open. A door position contact that opens sequentially as the door moves.

Figure 4 shows a voltage comparison circuit, in which 40 to 44 are resistors;
45 is a capacitor, 46 is a comparator, 47 is a transistor, and 48 is an overcurrent detection relay.

Next, the operation of this embodiment will be explained with reference to FIG.

Assume that the car door 1 is now in the fully open position.

When the door closing condition is satisfied, the conditional circuit 25 is closed.

When the door is opened or closed, the relay 26 is energized, and the contact 26b is opened and the contact 26a is closed.

(+)30 - 2 6a -2 7c - 28-(
-), the door closing relay 28 is energized, and the contact 28a
, 28b are closed, and contacts 28c, 28d are open.

(+)-2 8a-35-5b -32-28b-(→
A voltage is applied to the armature 5b by the circuit, and the armature 5b
begins to rotate.

At this time, the voltage Va generated across the resistor 35 is Va1
becomes.

Also, (020-21-23a-24a -27-(→
A current flows through the circuit, and the voltage Vs generated across the resistor 20 becomes Vs1.

Further, a voltage Va corresponding to the armature current is generated across the resistor 35.

During normal door opening/closing operations, the voltage Vs is set to always be higher than the voltage Va over the entire area of the door.

The voltage Vs and the voltage Va are compared by the voltage comparison circuit shown in FIG. 4, and when vs≧Va, the transistor 47 is non-conductive and the overcurrent detection relay 48 is deenergized.

In addition, in the case of vs〈■a, the transistor 47 is conductive,
Current detection relay 48 is energized.

Now, when the car door 1 starts to open, Vs,>Va
, so the detection relay 48 is deenergized and the contact 48a is closed.

The rotation of the armature 5b causes the car door to move in the door closing direction, and when the door position contact 22b is closed, the resistor 32 is short-circuited, the car door 1 is accelerated, and the voltage Va becomes Va2.

At the same time, the contact 22a is also closed, a part of the resistor 21 is short-circuited, the current flowing through the resistor 20 becomes a dog, and the voltage Vs becomes Vs2.
becomes.

However, since v s2>Va2 still holds, the detection relay 48 is deenergized.

Furthermore, when the car door 1 closes, the contact 23b closes and the resistor 33 is connected in parallel with the armature 5b, so the car door 1 decelerates and the voltage Va becomes Va3.

At the same time, the contact 23a is opened, the current flowing through the resistor 20 becomes small, and the voltage Vs becomes Vs3.

Similarly, the voltage Va
becomes Va4 and the voltage Vs becomes Vs4.

When the contacts 22b and 22a open just before the door is closed, the voltage Va becomes Va and the voltage Vs becomes Vs5.

When the detection switch 30 opens at the end of the door closing, the relay 28
is deenergized, contacts 28a and 28b are opened and the car door is stopped.

When the car door 1 opens, the condition circuit 25 is opened, the detection relay 26 is deenergized, and the contact 26b is closed, (+)-
The door opening relay 27 is energized by the circuits 29-26b-28c and 27-(-), and the contacts 27a27b are closed.

As a result, a current flows through the armature 5b in the opposite direction to that during the door closing operation, and the car door 1 begins to open.

As the door opens, the contacts 22b, 36, and 37 operate sequentially, and the contact 22b opens just before the door opens.
The speed of the car door 1 is controlled and the value of the voltage Va is also changed.

As is clear from the above description, the circuit of the resistor 21 constitutes a current command generation circuit that generates a current command signal according to the position of the car door 1 during the door closing operation.

On the other hand, although not shown, a similar current command generation circuit for the door opening operation is provided, and the voltage Vs changes depending on the position of the door, as in the case of the door closing operation.

Next, a case where the car door stalls will be explained.

If a person is caught between a part of the car door other than the safety device and the car doorway during the door closing operation, the movement of the armature 5b is restricted and the armature current increases.

Therefore, the voltage Va becomes larger than the voltage Vs depending on the position of any door 1 depending on the force at that time.

(For example, V s 1 < V a 1y V s 2 <
V a 2 etc.

) When the voltage Va becomes lower than the voltage Vs, the transistor 47 becomes conductive, the detection relay 48 is energized, and the contact 48a is opened.

As a result, the finger 4") relay 26 is deenergized, and the contact 26a
is opened, the relay 28 is deenergized, and the car door 1 is stopped by opening the contacts 28a and 28b.

At the same time, contact 26b is closed, relay 27 is energized, and by closing contacts 27a and 27b, car door 1 is reversed and opened.

Furthermore, even if your finger gets caught between the car door 1 and the door bag during the door opening operation, the door 1 on either side will turn over and restart as described above.
Since this can be easily understood from the above explanation, detailed explanation will be omitted.

In this way, in the entire opening and closing range of the car door 1, vs.
>Va, and the voltage Vs at the fully open position and the fully closed position is lower than that at the intermediate position, and V s2>V Sl
, Vs2>Vs5, the increase in the tightening force of the car door 1 is limited to a substantially constant value no matter where a person is caught.

In particular, even if a person is caught in the fully open position or the fully closed position, it can be detected with the same level of sensitivity as the sensitivity at the center of the door 1 (V S2V a2).

In addition, in the above embodiment, when a person is caught in the car door 1,
Although we have shown an example of reversing the door and restarting it, it is also possible to stop it at that position, and when the human body or finger comes out, continue the previous operation from that position and complete the door closing or door opening operation. Easy to implement.

As explained above, this invention can be used depending on the position of the door. A current finger current signal is set, and the door is stopped or reversed when the current signal corresponding to the armature current of the motor that drives the motor exceeds the current finger current signal, so that the door can be stopped or reversed at any position of the door. Even if a person is caught in a door, the increase in the tightening force of the door can be limited, and the person can be prevented from being harmed.

[Brief explanation of drawings]

Figure 1 is a front view of the elevator car door opening mechanism as seen from the landing side, Figure 2 is the operating characteristic curve diagram of Figure 1, and Figure 3 is a diagram of the operating characteristic curve of Figure 1.
The figure is a circuit diagram showing an embodiment of the elevator door control device according to the present invention, FIG. 4 is a circuit diagram showing an embodiment of the voltage comparison circuit diagram, and FIG. 5 is a signal voltage characteristic during door closing operation. It is a curve diagram. 1... Car door, 2... Electric motor, 5a... Armature, 2
0. 21...Resistance, 22a, 22b to 24a, 24b
...Door position contact, 25...Door open/close condition circuit, 26...Door open/close command relay, 27...Door open relay, 28...Door close relay, 29...Full open detection switch, 30...Fully closed Detection switch, 32-35...Folding, 36, 37...Door position contact, 40-44...Resistor, 45...Capacitor, 4
6...Comparator, 47...Transistor, 48...Overcurrent detection relay.

Claims (1)

[Claims] 1. A motor that drives the door and causes an armature current to flow according to the position of the door, a current command generation circuit that generates a current command signal that corresponds to the position of the door, and a current signal that generates a current signal that corresponds to the armature current of the motor. A control device for an elevator door, comprising: a current signal generating circuit; and a circuit for stopping or reversing the door when the current signal exceeds the current command signal.