KR20120045143A

KR20120045143A - Protection apparatus for door opening of elevator

Info

Publication number: KR20120045143A
Application number: KR1020100106498A
Authority: KR
Inventors: 유현종
Original assignee: 유현종
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2012-05-09

Abstract

The present invention enables the passenger cage to open and lower the elevator cage only when the elevator stops at the correct position during operation, and provides a locking device that does not open the cage inner door at positions other than the fixed position, the elevator stops A signal input unit for receiving a signal from a sensor for detecting a time position and a signal from a control panel; A microcomputer control unit which reduces noise when operating and releasing the solenoid lock device by a signal of the sensor and makes a smooth operation; An operation unit driving the solenoid to operate or release the locking device; A signal output unit for outputting a lock operation signal to the control panel and feeding back to the microcomputer control unit; When the door is open after the elevator stops at the right position, the lock is released smoothly without noise.If the elevator does not stop at the stop position due to power failure, malfunction or malfunction during operation, It is possible to provide a reliable door opener that prevents a passenger from artificially opening the door of the elevator and thus prevents a safety accident.

Description

Door opening prevention device of elevator {PROTECTION APPARATUS FOR DOOR OPENING OF ELEVATOR}

The present invention relates to a device for preventing the door opening of the elevator, and more particularly, in the emergency state in which the elevator stops at a position other than the home position and the door of the elevator is not opened, the user who boards the elevator is artificially The present invention relates to a door opening preventing device of an elevator, which prevents the door of the elevator from being opened.

In general, the door of the elevator door is opened only when the elevator stops at the correct position of the floor to be stopped while the elevator is running.

1 is a schematic diagram illustrating a driving state of an elevator in a conventional lifting passage.

As can be seen in the figure, as the door 8 of the cage 1 is opened, the door 8 of the cage and the outer doors 7 and 10 of the floor on which the elevator stops are mechanically bound to the external door. (7) and (10) also have a structure that opens together. That is, as shown in FIG. 1, the elevator 1, which is a cage, is positioned at one side of the elevating passage 11, and the weight 3 is connected to the wire 12 through the winch 2 on the opposite surface.

Therefore, the elevator cage (1) operation is driven by the control panel to drive the motor to the passengers desired floor, the hoist (2) by the motor rotates forward or reverse to the desired floor and stops the cage (1), The operation of opening the door 8 is performed.

However, as shown in FIG. 1, when the cage 1 of the elevator stops between the upper floor 5 and the lower floor 6 due to a mistake such as a failure, malfunction or power failure during operation, the door 8 of the elevator 1 is closed. Although not opened, when the user who boards the elevator 1 forcibly opens the door 8 of the cage 1 to try to escape, the door 8 is opened to open the space between the cage 1 and the elevator driving passage 11. Accidents can fall into spaces.

Of course, in order to prevent such an accident, the fall prevention blocking plate 9 is installed between the elevator cage 1 and the passage, but it cannot be completely prevented, and the elevator for the disabled must have a transparent structure in which the inside of the cage is visible to prevent the fall. There is a problem that the blocking plate 9 is not suitable for use.

Due to these problems, the elevator door 8 is opened and stopped at a position other than the home position only when the elevator stops in position to prevent an accident that may occur when the door 8 of the elevator cage is forcibly opened. When attempting to artificially open the sea cage (1) door (8) it is necessary to lock the door does not open.

Therefore, in the past, a solenoid, a latch connected to the solenoid, and a locking device configured only on and off of a contact connected to the latch are used. However, only a packing is formed at the contact portion of the moving part to reduce noise generated during operation. The operation noise generated from the back is severe and many elevator users are surprised and mistaken for failure. In addition, the locking device and the control circuit unit for driving the locking device are configured independently and occupy space when installed, and have to be connected to each other by wires, which requires a lot of time and is not easy to maintain.

Therefore, the present invention is to solve the above conventional problems, the object of the present invention, to prevent accidents that occur when attempting to escape by forcibly opening the door when the elevator stops in an abnormal position. It is to provide an elevator door opening prevention device.

Another object of the present invention is to integrate the lock device and the control circuit part, which are separated from each other in the conventionally, in the use of the door open prevention device as described above, and to lock the micro-control circuit part composed of a relay, a timer, and the like to be configured inside the lock device. It is to improve the work efficiency during installation or maintenance by reducing the work of connecting the devices and control circuits with each other by wires.

Another object is that, when the door opening prevention device is operated, the microcomputer control unit repeatedly supplies on and off when the operating power is supplied to the solenoid. It is to provide a door opening preventing device of the elevator to enable users to use the elevator safely and conveniently.

According to the present invention, the power supply confirmation unit for checking whether the power supplied from the elevator control panel power supply or emergency power, and a signal input unit for receiving the signal sent from the open signal and the position detection sensor sent from the elevator control panel and Elevator control, characterized in that the microcomputer control unit, the operation unit for locking or releasing operation, the signal output unit for feeding back the operation signal to the microcomputer control unit and output to the elevator control panel, and the control circuit board integrally Achieved by an anti-opening device.

Here, when the solenoid in the operating unit is excited, the flanza is operated, and when the clamp connected to the planar moves about the hinge, the auxiliary shock absorber integrated with the latch, the movable contact for confirming operation, the fixed contact, and the contact It is preferable that the spring and the return spring enhance the adhesion.

In addition, the microcomputer control unit is configured to switch immediately after the open signal input to the input pin or to operate after a predetermined time delay, and when mounted vertically and horizontally when the planar and the latch is different by gravity It also has a selector switch that can select it according to the mounting direction.It supplies on and off repeatedly when supplying the solenoid driving power, and decrements the on / off cycle according to the position of the planar, and consumes current when it is released. It is effective to reduce the on / off cycle according to the position of solenoid by reducing and to reduce the current consumption when maintaining the release state.

When the microcomputer control unit according to the present invention has a problem and cannot perform a normal operation, it is preferable to turn off the relay by turning off the control panel power supply and release the locked state by artificially inputting a negative signal to the open signal input terminal.

According to the present invention as described above, there is an effect of providing a door opening preventing device for preventing accidents that occur when attempting to escape by forcibly opening the door when stopped in an abnormal position, the door opening preventing device in this way In use, it is possible to secure space because the lock device and the control circuit part, which were separated from each other in the past, are integrated. It is effective to improve the performance and to provide a reliable door opening prevention device of the elevator.

In addition, it is possible to reduce the current consumption when maintaining the open state, so that the noise is rarely generated during operation, there is an effect that can be used safely and conveniently in the elevator. In addition, since buildings are becoming higher and the height between floors is increasing, there is an effect that the convenience and economy can be doubled by using the door opening prevention device other than the elevator lift position of the present invention, rather than using the fall prevention blocking plate.

1 is a schematic diagram illustrating a driving state of the lifting passage or the elevator, Figure 2 is a block diagram of the door opening preventing device of the present invention, Figure 3 is a reference diagram of the cage door is locked by the door opening preventing device, Figure 4 is a reference diagram of the cage door is opened by the door opening preventing device, Figure 5 is a circuit diagram for controlling the door opening preventing device of the present invention, Figure 6a, 6b is the drive of the door opening preventing device of the present invention It is a flowchart showing the state.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

Prior to this, the terms or words used in this specification and claims should not be construed in the ordinary and dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only one preferred embodiment of the present invention, and do not represent all of the technical ideas of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be water and variations.

2 shows a block diagram of the elevator door opening preventing device of the present invention. The power check unit 35 to which the DC power is applied is composed of a control panel power input terminal receiving power input from the elevator control panel and an emergency power input terminal receiving emergency power, and if the elevator control panel power is not supplied, the relay ( It is configured to automatically receive emergency power by K1).

The signal input unit 45 receives an open signal transmitted from the elevator control panel and an open signal of a position detection sensor, and transmits the signal to the microcomputer control unit 50. The microcomputer control unit 50 receives the signal and the signal output unit input from the signal input unit 45. The control unit 55 is efficiently controlled according to the signal fed back from the 40, and the signal output unit 40 is turned on or off according to the operation of the operating unit 55 (24-26, 25-27). Send the status to the elevator control panel or feed back to the microcomputer control unit 50. The operation unit 55 is configured to perform the locking and releasing operation with the latch 21 connected to the flanza 20 of the solenoid 19 driven by the control of the microcomputer control unit 50.

5 is an implementation circuit diagram of the door opening preventing device at the stop other than the elevator lift position of the present invention.

As can be seen in this figure, the power check unit 35 to which the DC power is applied is composed of a control panel power input terminal receiving power input from the elevator control panel and an emergency power input terminal receiving emergency power. A relay K1 that is excited when the control panel power is supplied, a diode D3 that absorbs back electromotive force generated when the relay K1 is turned off, a photocoupler IC4, and a current limiting resistor R2. When power is supplied to the control panel power input terminal, the relay K1 is excited and "+24" flows through the line filter LP1 to the "+ 24A" terminal through contacts 1 and 5 of the relay K1. The power supply is supplied to the microcomputer IC6 through IC IC1 and supplied to the microcomputer IC6, and the lamp LD1 is turned on through the current limiting resistor R1 to indicate that the microcomputer CI6 is supplied with power. . If power is not supplied to the control panel power input unit of the power check unit 35, the relay K1 is not excited and thus emergency power is applied to the "+24" terminal through the first contact point and the sixth contact point. Supply power to the microcomputer IC6.

The microcomputer IC6 is a PIC16C54 device, and is connected to the oscillation device through pins P15 and P16. The power supply VCC supplied to the microcomputer IC6 is supplied through the constant voltage IC IC1, and the power supply VCC. ), The smoothing condenser (.1) and the bypass condenser (C2) are connected. In addition, all input pins P1, P6, P7, P8, P9, and P10 of the microcomputer IC6 have an array resistor connected to the ground to prevent a malfunction.

The pin P9 of the microcomputer IC6 receives the signal sent from the elevator control panel, and the diode D6 is connected to pass only the negative signal (-), and the open signal confirmation lamp to which the current limiting resistor R12 is connected. An open signal input portion composed of a photo coupler IC4 connected to the LD2 and connected to the current limiting resistor R13 is configured.

In addition, the pin (P6) of the microcomputer (IC6) receives a signal from the door open area (door zone) confirmation sensor to confirm that the elevator door is a safe position even if the elevator door is open, the diode (D1) to pass only the negative signal (-) And photocoupler IC3 to which current limiting resistor R14 is connected. The pin P1 of the microcomputer IC6 is connected with a jumper JP3 so as to select an operation delay time when a signal is input, and the pin P10 is gradually contacted when the present invention performs the opening operation (24, 26). The pull-down resistor (R23) is configured to be connected to the ground to prevent a malfunction when the VCC signal is input through the VCC signal.

In addition, the microcomputer (IC6) pin (P8) is a jumper (JP1) that can be selected and used because the operating conditions are different when the present invention is used in the vertical direction and when used in the horizontal direction. The output pin P12 of the microcomputer IC6 has a photocoupler IC7 having a current limiting resistor R5 connected to the primary side, a current limiting resistor R6 for limiting the current when the FET Q2 turns on, and a malfunction preventing pulldown resistor. (R24), the diode (D5) for discharging back electromotive force during operation of the solenoid (19), and the lamp (LD3) connected to the current limiting resistor (R10) on one side so that the operation of the solenoid (19) in parallel with the solenoid (19) Consists of

In addition, the output pin P13 of the microcomputer IC6 has a photocoupler IC8 having a current limiting resistor R8 connected to the primary side, a current limiting resistor R9 for limiting the current when the FET Q3 is turned on, and a malfunction prevention pulldown. When the solenoid 19 is excited and the latch 21 is completely opened, the resistor R25 supplies a small current to the solenoid 19 through the resistor R15 to maintain an open state. ) Is configured not to export output.

The output pin P17 of the microcomputer IC6 has a current limiting resistor R3 that pulls down a resistor R4, a TR (Q1) for driving the relay K2, a diode D4 for discharging the counter electromotive force, and a relay K2. It consists of a relay (K2) when the excitation is configured to send an open confirmation signal to the elevator control panel.

In case the microcomputer (IC6) has a problem and fails to perform normal operation, turn off the relay (K1) by turning off the control panel power supply and artificially input the signal (-) to the open signal input terminal to pass through the diode (D6). The lamp LD2 is turned on and applied to the emergency open signal terminal via the contact points 2 and 8 of the relay K1 to excite the relay K3 and the power supply (-) is the contact point (1, 2) of the relay K3. It is configured to be supplied to the solenoid 19 through the non-return diode (D7) and the resistor (R15) through,

In addition, the capacitor C5 is applied to the solenoid 19 through the backflow prevention diode D8 through the FET Q5 thickened by the resistor R20 until the capacitor C5 is charged through the distribution resistors R21 and R17. When the capacitor C5 is charged, the gate potential of the FET Q5, which was turned on by the resistor R20, is turned on by the current limiting resistor R18, so that the gate potential of the FET Q5 turned on by the resistor R20. Since the FET Q5 is turned off, the solenoid 19 is supplied with the power supply (-) only through the non-return diode D7 and the current limiting resistor R15, so that the solenoid 19 is maintained with a small current. The solenoid 19 is configured to reduce heat even when operated for a long time.

Moreover, the counter electromotive force discharge diode D9 which absorbs the counter electromotive force which arises when the relay K3 is OFF is comprised.

6A and 6B are flowcharts showing a driving state of the present invention.

This flow can be divided into power check routine and power supply routine (RT1), control panel power supply routine (RT2), emergency power supply and operating routine (RT3) when operating with emergency open signal. .

First, the power supplied after the start system (S1) is input and used as the operating power of the present invention. First, the control panel power and emergency power "-" are commonly connected to "OV" through the fuse (F1) and the line filter ( It is supplied to the common (-) of the operating power source via LF1).

When the control panel power supply checking step S2 is supplied to the control panel power supply input terminal, the relay K1 is excited and the current limiting resistor R2 is applied to the photocoupler IC4 connected to the ground to supply the photocoupler IC4. If the VCC connected to the photo TR collector is applied to the input pin (P7) of the microcomputer IC6 through the emitter by turning on the light emitting diode configured inside and turning on the opposite photo TR, the resistor ( Since the input pin P7, which was connected to ground through RA1) and maintained low potential, is changed to high potential, the microcomputer IC8 knows that the control panel power is supplied. Emergency power supply system (S8) is not energized to the control panel power input unit, the relay (K1) is not excited and the emergency power is applied to the "+24" terminal through the contacts 1 and 6 of the relay (K1) Operating power is supplied in the above manner.

When power is supplied to the control panel power input terminal, the microcomputer drive stem S3 is energized and "+24" through the line filter LF1 through contacts 1 and 5 of the relay K1. Flows to the + 24A "stage and changes to a constant voltage power supply suitable for driving the microcomputer IC6 through the constant voltage IC IC1 and is supplied to the microcomputer IC6 to drive the microcomputer IC6 and the lamp LD1 through the current limiting resistor R1. ) To indicate that power is supplied to the microcomputer (IC5).

The diode D3 connected in parallel with the coil of the relay K1 absorbs back EMF generated when the relay K1 is turned off, and the capacitor C1 removes the ripple included in the power supply voltage.

In this state, the open or DZ step (S4) is applied to the open signal input terminal when the release signal (-) is input from the elevator control panel when the control panel power is supplied, and the current limiting resistor (R16) is "+ 24A" at one side through the diode D6. The lamp (LD2) connected to the stage is turned on and the current limiting resistor (R13) is applied to the photocoupler (IC5) connected to the "+ 24A" stage on one side, so that the VCC is input pin (P9) of the microcomputer (IC6). ), The input pin (P9) held at low potential is changed to high potential due to the resistor (RA1) connected to the ground so that the microcomputer (IC8) knows that the open signal is input and performs the following operation.

In addition, the open or DZ stem (S4) is a diode when a signal (-) is input from the sensor that detects the correct position (DZ), the door open safety area (door village) of the elevator, at the input position of the correct position signal (DZ) when emergency power is supplied. When the current limiting resistor R14 is applied to the photocoupler IC3 connected to the "+ 24A" terminal through the D1, and VCC is applied to the input pin P6 of the microcomputer IC6, the resistor connected to the ground Due to the RA1, the input pin P6 held at the low potential is changed to the high potential, so that the microcomputer IC8 knows that the correct position DZ signal is input and performs the next operation.

When the locking device release step S5 outputs a signal (+) from the microcomputer IC6 output pin P12, the current limiting resistor R5 is applied to the photocoupler IC7 connected to the ground side to the photocoupler IC7. When the secondary side of the) is turned on, the photocoupler IC7 is connected to the gate of the FET Q2 that is kept at a low potential state through the resistor R24 and the current limiting resistor R4 connected to the ground side. Since + 24A is applied through the current limiting resistor R6 to become a high potential, the FET Q2 is turned on.

When the FET Q2 is turned on, the ground power supply (−) is applied to the solenoid 19 connected to + 24A through the source and the drain of the FET Q2 so that the solenoid 19 is excited.

When the solenoid 19 is excited, the flanza 20 is pulled and the clamp 21 connected to the flanza 20 moves about the hinge 22 as a center axis, and the clamp 21 is a cylinder of the auxiliary shock absorber 31. While continuing to move in a state of decreasing the speed slightly to reach the (32), the claw 21 is constantly fixed to one side of the claw 21 to reach the cylinder 32 of the auxiliary shock absorber 31 and to continue to move in a slightly reduced state Release check of the movable contact bundle 23 When the movable contact 24 and the fixed contact 26 come into contact with each other and VCC is applied to the microcomputer IC6 input pin P10 through the release check contacts 24 and 26, a malfunction prevention resistance. Through input (R23) the input pin (P10) of the low potential state becomes a high potential state, the microcomputer (IC6) determines that the latch 21 is almost released, the output of the microcomputer (IC6) output pin (P12) is turned off Momentarily stop the operation of the latch 21, and then turn on the output of the output pin (P12) of the microcomputer (IC6) solenoid (19) When the operation to turn the drive on and off is repeated, the latch 21 is completely released with little noise, and the movable contact 24 is caught by the cage door 21 which is not caught by the latch 21 while the spring 28 is compressed ( 8) can be opened.

In addition, when the release confirmation signal is fed back to the microcomputer CI6 through the release confirmation contacts 24 and 26, TR (Q1) outputs the current limiting resistor R3 when the signal (+) is output through the microcom IC6 output pin P17. Since it is turned on through the relay (K2) is excited and the open confirmation signal is sent to the elevator control panel through the relay (K2) contact, the control panel performs the following operation.

The release check stem (S6) and the lock release mechanism (S7) output a signal (+) at the microcomputer (IC6) output pin (P13) after a certain time after the latch 21 is completely released. When (R8) is applied to the photocoupler IC8 connected to the ground side and the arch side photoTR configured to face the inside of the photocoupler IC8 is turned on, the resistor R25 and the current limiting resistor R9 connected to the ground side are turned on. The gate of the FET Q3 held at the low potential state through the photocoupler IC8 is connected to the secondary photo TR and + 24A is applied through the current limiting resistor R9 to become a high potential. It is turned on. When the FET Q3 is turned on, the ground power supply (-) is applied to the solenoid 19 connected to + 24A on one side through the current limiting resistor R15 via the source and drain of the FET Q2, and then the microcomputer IC6. When the output pin P12 is turned off, the FET Q2 is toned off and only the holding power through the FET Q3 and the resistor R15 is supplied to the solenoid 19 to maintain the release state with a small current.

While maintaining the release state as described above, after closing the cage door 8 and removing the open signal, the signal (+) is turned off at the microcomputer (IC6) output pin (P13), the solenoid 19 is turned off, and the latch 21 Is moved in the locking direction by the return spring 34 and the cylinder 30 of the auxiliary shock absorber 29 fixed to the latch 21 contacts the opposite surface and locks in a state of slightly reduced speed, and then releases the check contact 24. If 26) falls, alternately turn on and off the output pin (P12) and output pin (P13) of the microcomputer (IC6) repeatedly until the lock is completely locked.

When the latch 21 is locked in this way, the movable contact 25 and the fixed contact 27 fixed to one side of the latch 21 are brought into contact with each other, and the contact force is increased by the spring 28, and the locked contact is closed at the signal output unit 40. When the lock confirmation signal is sent to the elevator control panel via (25, 27), the control panel performs the next operation.

Door zone check step (S9) is when the control panel power is not supplied due to a power failure or failure, so when the emergency power is supplied, the sensor detecting this when the elevator is in a safe position even when the door is opened, The microcomputer (IC6) input pin (P6) through the coupler (IC3) to make a high potential so that the microcomputer (IC6) checks this, and when the control panel power is supplied, the same release operation as when the open signal is applied to the open signal input terminal. Let's do it.

The open signal check system (S10) does not supply power to the control panel due to a power failure or failure, so when the emergency power supply is in a safe position even when the elevator is opened, a problem occurs in the microcomputer (IC6) or the control circuit and the normal operation is performed. If the signal is not artificially applied to the open signal input terminal, the relay (K3) is excited by being applied to the emergency open signal terminal through the diodes (D6) and through the contacts 2 and 8 of the relay (K1). The power supply (-) is configured to be supplied to the solenoid 19 through the non-return diode D7 and the resistor R15 through the contacts 1 and 2 of the relay K3, and also to distribute the distribution resistors R21 and R17. When the capacitor C5 is charged, the current limiting resistor is applied to the solenoid 19 through the non-return diode D8 through the FET Q5 turned on by the resistor R20 and then to the charge of the capacitor C5. When TR (Q4) is turned on via (R18), resistor (R20) The gate potential of the FET Q5, which was turned on by the transistor, is lowered by TR (Q4) and the resistor R19, so that the FET Q5 is turned off so that the solenoid 19 has a backflow prevention diode D7 and a current limiting resistor R15. Power supply (-) is supplied only through the lock to release the lock.

In addition, the microcomputer (IC6) input pin (P1) is used as a switch to operate immediately after the opening signal input or after a predetermined time delay, the input pin (P8) is a vertical opening of the door opening prevention device other than the exact position of the present invention When mounted horizontally and when mounted horizontally, the flanza 20 and the latch 21 is used as a selection switch that can be selected according to the mounting direction because the gravity acts differently.

1: lift 2: hoist 3: weight
4: upper layer 5: middle layer 6: lower layer
7: Middle level exterior door 8: Cage door 9: Fall prevention blocking plate
10: Lower exterior door 11: Lift passage 12: Wire rope
19: solenoid 20: flanza 21: brace
22: hinge 23: movable contact bundle 24, 25: movable contact
26, 27: fixed contact 28: spring 29, 31: auxiliary shock absorber
34: return spring 35: power supply confirmation section 40: signal output section
45: signal input unit 50: microcomputer control unit 55: operating unit
C1, C2, C3 ....: Condenser D1, D2, D3 ...: Diodes R1, R2, R3 ...: Resistance
Q1, Q4: Transistors S1, S2, S3 ...: Step

Claims

A power check unit 35 for checking whether the power supplied is the power sent from the elevator control panel or the emergency power;
A signal input unit 45 and a microcomputer control unit 50 for receiving the open signal sent from the elevator control panel and the signal sent from the position detection sensor;
An operation unit 55 for locking or releasing operation, a signal output unit 40 feeding back an operation signal to the microcomputer control unit 50 and outputting the operation signal to the elevator control panel;
The elevator door opening preventing device, characterized in that the control circuit board 33 is formed integrally.

The method of claim 1,
When the solenoid 19 in the operating unit 55 is excited, the flanza 20 is operated, and when the catch 21 connected to the planar 20 moves about the hinge 22, it is integral with the catch 21. The auxiliary shock absorbers 29 and 31, the movable contact points 24 and 25 for operation check, the fixed contact points 26 and 27, the spring 28 to increase the adhesion of the contact points, and the return springs 34. Elevator door opening preventing device, characterized in that configured.

The method of claim 1,
The microcomputer control unit 50 is configured to switch immediately to operate when the input signal to the input pin or to operate after a predetermined time delay, and when mounted vertically and horizontally attached to the planar 20 and the latch ( Since the 21) acts differently by gravity, a selector switch for selecting it according to the mounting direction is also configured. When the solenoid 19 driving power is supplied, the switch is repeatedly turned on and off and turned on according to the position of the planar 20. To reduce the current consumption when maintaining the release state, and to reduce the current on and off according to the position of the solenoid 19, and to reduce the current consumption when maintaining the release state to prevent heat generation of the solenoid 19. Elevator door opener.

The method of claim 1,
When the microcomputer control unit 50 has a problem and cannot perform a normal operation, the control panel power supply is turned off to turn off the relay (k1), and when the signal (-) is artificially input to the open signal input terminal, the locked state is released. Elevator door opener.