JPH0647884Y2 - Control device for elevator doors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an elevator door that limits the rotation torque of the motor when the rotation speed detection signal of the motor becomes larger than a predetermined value from the speed command of the motor. The present invention relates to a control device.

[Prior Art] As a conventional elevator door control device, for example, JP-A-60
There is one disclosed in Japanese Patent Publication No. 71489. FIG. 5 is a block diagram of the control device shown in this publication.

In FIG. 5, (1) is a motor for driving the opening and closing of an elevator door (not shown). The rotation speed of this motor (1) is detected by the speed generator (2), the output of this speed generator (2) corresponds to the opening and closing speed of the door, and its output is sent to the differential amplifier circuit (4). Sent. A speed command generated at the opening / closing position of the door is also input from the speed command circuit (3) to the differential amplifier circuit (4).

The output of the differential amplifier circuit (4) is input to the current amplifier circuit (5) through the output cutoff circuit 9, and the output thereof controls the energization flow of the motor (1). On the other hand, the output of the differential amplifier circuit (4) is input to the integration circuit (7) via the voltage level detection circuit I (6). The output of the integrating circuit (7) is input to the voltage level detection circuit II (8), and when it exceeds a certain level, a signal is sent to the output cutoff circuit (9) to cut off the input to the current amplification circuit (5). Then, the motor (1) is stopped. In other words, the doors are stopped to ensure passenger safety.

As an operation example in the configuration of FIG. 5, a door opening operation of the door when the door operates from the fully closed position to the fully open position will be described using output waveforms of each circuit shown in FIG.

In FIG. 6, (a) is an output signal corresponding to the time (horizontal axis) from the fully closed state to the fully opened state of the speed command circuit (3), which is a command signal corresponding to each position of the door. (B) is the output of the speed generator (2) attached to the motor (1),
The rotation speed of the motor (1) is detected. Also, this output corresponds to the door opening speed. (C) is the output (b) of the speed generator (2) and the output (a) of the speed command circuit (3)
The outputs of the differential amplifier circuit (4) are compared with each other, and the + side (upper side) than the zero level is a power running signal and the − side (lower side) is a braking signal. The output signal of the differential amplifier circuit (4) is input to the integration circuit (7) via the voltage level detection circuit I (6), and the integrated output shown in (d) is obtained. In the normal door opening operation, the output of (d) is the voltage level detection circuit II.
Since it is below (−) the detection level of (8), (e)
Since the output cutoff circuit (9) shown in FIG. 6 does not operate, it proceeds as in (b), operates to the fully opened state, fully opens the door, and then stops.

By the way, if the differential amplifier circuit (4) fails,
Since the outputs of (c) and (d) rise to the level shown by the broken line, the output signal of the broken line as shown in (e) is generated, the output cutoff circuit (9) is activated, and the current amplification circuit (5). Shut off the input to the motor and stop the motor (1).

[Problems to be Solved by the Invention] In the conventional elevator door control device as described above, in the case of a failure such that the differential amplifier circuit of the door control circuit is saturated on the power running side, an uncontrolled state is generated. As a result, it may lead to accidents such as burnout of the motor, which may be dangerous to passengers. As a countermeasure against such a situation, the output of the differential amplifier circuit is integrated from the start of the door opening operation, and when the value exceeds a predetermined value, the output from the motor drive circuit is shut off and the current supplied to the motor is reduced. Since it was shut off, there was a problem that the door could not be opened and closed while it was not completely open.

In addition to the above, for some reason including renovation, the weight of the door increases, the opening size increases, the running resistance of the door increases, or when the door is suddenly turned over. When a larger motor torque is required, the time required for the differential amplifier circuit to saturate corresponding to this torque becomes longer. When this happens, the above integrated value becomes larger than a predetermined level, and the shut-off circuit operates to stop the motor. Therefore, there is a problem that the door stops until it cannot be opened.

An example of a defect in the conventional circuit when such an inconvenience occurs during the door opening operation will be described with reference to FIG.

FIG. 7 is an explanatory diagram of an operation example similar to that of FIG.
The broken line waveforms shown in FIGS. (B), (c) and (d) are waveforms in the normal case of FIG. 6 and are shown for reference.

When the load increases, the output of the speed generator (2) decreases and the door speed decreases as shown in FIG. 7 (b). Therefore, since the torque of the motor (1) is required correspondingly, the output of the differential amplifier circuit (4) becomes high as shown in (c). When the output of the differential amplifier circuit (4) becomes high, (d)
As shown in, the output of the integrating circuit (7) also becomes high, and its output exceeds the detection level. Therefore, time t ₁
At the point of time, the output cutoff circuit (9) operates as shown in (e), and the motor (1) is stopped. That is, in terms of the operation of the door, the door starts to open and stops at an intermediate position where it does not fully open, which causes a problem that the output cutoff command is detected even though the circuit itself is not a failure. It does not satisfy the function of the door.

This invention was made in order to solve the above problems.A signal of the fully open position is added as an operating condition of the integrating circuit, and when the amplifier circuit fails or the load on the door changes, An object of the present invention is to obtain a control circuit that ensures safety when the door is opened so that the door does not stop when the door is fully closed and does not stop midway during the door opening operation.

[Means for Solving Problems] An elevator door control device according to the present invention uses an actuation amplification circuit to calculate a deviation between a rotation speed of a motor that drives the opening and closing of an elevator door and a speed command corresponding to the opening and closing position of the door. In the control circuit that outputs and integrates the output, and cuts off the energizing current of the motor when the integrated value becomes a predetermined value or more, the output side of the circuit that separately outputs the fully open position signal of the door and the differential amplifier circuit The output side of the voltage level detection circuit connected to the output side of is connected to the input side of the integration circuit via the AND circuit, and the output of the differential amplification circuit is integrated by the activation of the fully open position signal.

[Operation] In this invention, since the output of the differential amplifier circuit is integrated by the activation of the fully open position signal, the normal function detecting means of the amplifier circuit performs the output integration as in the conventional case. Instead of the conventional full range check, the door is waiting for opening at the time of full opening (the door is waiting for a certain period of time from the opening operation to the closing operation. If the amplifier circuit at this time is normal, its output is If the amplifier circuit is normal (the output is small at this time) by integrating the output of the amplifier circuit during (small), even if a failure of the amplifier circuit occurs, the door is fully closed or The door does not stop working until the door is opened halfway.

[Embodiment] FIG. 1 is a block diagram showing a configuration of an elevator door control apparatus according to an embodiment of the present invention. In the figure,
Since (1) to (9) used the same reference numerals as those shown in FIG. 5, the description thereof will be omitted here. In FIG. 1, a circuit for applying a fully open position signal (10) through an AND circuit (11) is inserted on the input side of the integrating circuit (7) to output the voltage level detection circuit I (6) and the fully open position. When the signals (10) are input at the same time, the integrating circuit (7) operates.

That is, as seen in the configuration of FIG. 1, for example, at the time of checking the failure of the differential amplifier circuit (4), the door is fully opened and the AND circuit (1
The check is performed at the time when the door is fully opened (that is, while the door is waiting to open) when 1) is activated and integration by the integration circuit (7) is started, and the motor (1) is stopped in the door open state when a failure is detected. It is characterized by that. The output operation of each circuit in FIG. 1 will be described below.

FIG. 2 is an operation explanatory diagram based on output waveforms of main constituent circuits during normal operation of the control device of FIG. In the figure,
(A), (b) and (c) are the same as those described in FIG. (D) shows the output of the integrator circuit (7). Since the output of the differential amplifier circuit (4) is zero as shown in (e) during the door-opening standby after the full opening in the figure, the output of the integrator circuit (7) is The output is also zero. Therefore, the output cutoff circuit (9) does not operate as shown in (e). Then, the fully open position signal (10) for checking operates at the time of full opening, and the High signal is output during the time of fully opening as in (f).

Next, FIG. 3 shows an operation example in the case where the differential amplifier circuit (4) fails in this state, that is, while waiting for the door to open. If the differential amplifier circuit (4) fails at time t ₂ , the output saturates on the + side at that time as shown in (c), but since the front open position signal of (f) is output, the integration circuit ( Once t ₃ when 7) exceeds the detection level signal indicating that the output is a one-dot chain line starts operating as (d), and output (output cutoff circuit as shown in e) (9) motor ( Cut off the current of 1),
Holds the door open. That is, it operates so as not to move to the door closing operation.

Next, an operation example in the case where the differential amplifier circuit (4) fails during the door opening operation, that is, before being in the fully opened state will be described with reference to FIG. During the door-opening operation, as shown in (c), time t ₂
If a failure occurs in the differential amplifier circuit (4), the + side saturated output is output at that time. At this time, AND circuit (11)
Therefore, the integrating circuit (7) does not operate, and the motor (1) operates to reach the fully open state.

After the fully open position signal (10) is output as shown in (f) in the fully open position, the integrating circuit (7) starts to operate as shown in (d). Thus at time t ₃ the output is above the detection Saberu output cutoff circuit as shown in (e) (9) is output, so the motor is stopped (1).

As described above, even if the differential amplifier circuit (4) fails during the door-opening operation, the motor (1) stops after the door is fully opened, so that passenger safety is avoided without falling into a so-called "blunt" state. Can be secured.

[Effects of the Invention] As described above, the invention is effective when the output of the differential amplifier circuit of the control circuit is saturated for a long time and the malfunction tends to occur when the load on the elevator door becomes large for some reason. In addition, in response to untimely failure of the differential amplifier circuit, by adding a fully open position signal to check the defective state of the differential amplifier circuit when fully open, before opening the door, It is effective in improving the safety of elevator operation without touching passengers or causing a mess.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an elevator door control apparatus showing an embodiment of the present invention, and FIG. 2 is an operation explanatory diagram based on output waveforms of main constituent circuits of the apparatus of FIG. 1 during normal operation. FIG. 3 is an operation explanatory diagram when the differential amplifier circuit fails during the door opening standby, FIG. 4 is an operation explanatory diagram when the differential amplifier circuit fails during the door opening operation, and FIG. FIG. 6 is a block diagram showing the configuration of a control device for an elevator door, FIG. 6 is an operation explanatory diagram based on output waveforms of main constituent circuits during normal operation of the device of FIG. 5, and FIG. 7 is a door opening operation of a conventional device. It is operation | movement explanatory drawing of a defect example. In the figure, (1) is a motor, (2) is a speed generator,
(3) is a speed command circuit, (4) is a differential amplifier circuit, (5)
Is a current amplification circuit, (6) is a voltage level detection circuit I,
(7) is an integrating circuit, (8) is a voltage level detection circuit II,
(9) is an output cutoff circuit, (10) is a fully open position signal, (11)
Is an AND circuit. In the drawings, the same reference numerals are the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A motor for driving an elevator door to open and close,
Via a differential amplifier circuit that outputs a deviation signal between a signal corresponding to the rotation speed of the motor and a speed command signal corresponding to the opening / closing position of the door, and a voltage level detection circuit connected to the output of the differential amplifier circuit. A control circuit for inputting the output of the differential amplifier circuit to an integrator circuit and interrupting the energization current of the motor when the integrated value exceeds a predetermined level. An elevator door control device, characterized in that an AND circuit is provided between the circuit and a circuit for connecting the output of the differential amplifier circuit to the integrating circuit in response to a command of a fully open position signal of the door.