JPS6233194B2 - - 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.

FIG. 1 shows a device that uses semiconductor elements to control an electric motor that drives an elevator door.

In the figure, (+) and (-) are the positive and negative terminals of the DC power supply, 1 is the DC motor that opens and closes the elevator door, and 2 and 3 are the positive terminal (+), negative terminal (-), and armature, respectively. A door opening control element consisting of a transistor connected between 1, 4 and 5 are door closing control elements, and 6 is a door opening control element 2 and a door closing control element 4.
This is a fuse inserted between the connection point and the positive terminal (+).

When a door opening command is issued from an elevator operation control device (not shown), the door opening control elements 2 and 3 become conductive, and a current flows through the motor 1 in the direction of arrow A, causing the motor 1 to rotate and the door to open. Furthermore, when a door closing command is issued from the operation control device, the door closing control elements 4 and 5 are electrically connected and a current flows in the direction of arrow B to the motor 1, so that the motor 1 rotates in the opposite direction to when the door is opened. The door closes.

While the elevator car is running, in order to ensure the safety of passengers, the operation control device issues a door closing command, and the door closing control elements 4 and 5 are electrically connected, so the door does not receive the door closing pressing force. This prevents the door from opening easily even if a passenger tries to force it open.

However, if the door opening control element 2 or the door opening control element 3 has a conduction failure while the door closing control elements 4 and 5 are conducting, (+)-6-2-5-(-) or ( A power short circuit of +)-6-4-3-(-) is formed, and the fuse 6 is blown. As a result, no current flows through the electric motor 1 and the door closing force is lost, so if a passenger tries to pry open the door while the car is running, the door will open and there is a risk of the passenger falling into the exit path. occurs.

On the other hand, when the car stops and its position is within the door-opening area (usually several 100 mm above and below the floor), the operation control device issues a door-opening command and the door-opening control elements 2 and 3 become conductive. The door opens. However, at this time, if the door closing control elements 4 and 5 have a continuity failure,
(+)-6-2-5-(-), or (+)-6-4-
A power supply short circuit of 3-(-) is formed, and the fuse 6 is blown. As a result, no current flows through the electric motor 1, so even though the car is stopped in the area where the door can be opened, the door does not open, trapping the passenger inside the car.

This invention improves the above-mentioned problems by connecting a fuse to the door closing control element and connecting a contact that opens while the car is running to the door opening control element.
Even if a control element fails, the door closing force will not be lost while the car is running, and the door opening force will be reliably generated when the car stops, ensuring passenger safety. The purpose is to provide equipment.

An embodiment of the present invention will be described below with reference to FIG.

In the figure, fuses 7 and 8 are connected in series to door closing control elements 4 and 5, respectively, and fuses 9 and 10 are connected in series to door opening control elements 2 and 3, which are closed when the car is stopped and open when the car is running. This is a traveling relay contact. Other than the above, the configuration is the same as in FIG. 1.

Even if the door opening control element 2 or the door opening control element 3 has a conduction failure while the car is running, that is, when the door closing control elements 4 and 5 are conducting, the travel relay contacts 9,
Since 10 is open, no current flows through the door opening control elements 2 and 3, and the door opening control elements 4 and 3 do not flow through the electric motor 1.
5, the current continues to flow in the direction of arrow B, and the door maintains the closing force. Therefore, even if a passenger tries to force the door open while the car is running, the door will not open and there will be no danger of the passenger falling into the hoistway.

Furthermore, when the car stops in the door-opening area and the door-opening control elements 2 and 3 are electrically connected, the door-closing control element 4
Or, if the door closing control element 5 has a continuity failure, the travel relay contacts 9 and 10 are closed while the car is stopped, so (+) -9-2-8-5-(-), or A power supply short circuit of (+)-7-4-10-3-(-) is formed, and fuse 7 or fuse 8 is blown. As a result, no current flows through the door closing control elements 4 and 5, and current flows through the electric motor 1 in the direction of arrow A through the door opening control elements 2 and 3, so that the door opens. Therefore, even if the car is stopped within the area where the door can be opened, the door will not open, and there is no risk of trapping passengers inside the car.

Note that if fuse 7 or fuse 8 blows, the door cannot be closed and restarting of the car is prevented.

In addition, if the door opening control element 2 or the door opening control element 3 has a continuity failure, after the car stops and the door opens,
When the door closing command is issued from the operation control device and the door closing control elements 4 and 5 become conductive, a power supply short circuit similar to the one described above is formed, fuse 7 or fuse 8 is blown, and restarting of the car is prevented. be done.

In this way, even if any of the door opening control elements 2, 3 and the door closing control elements 4, 5 have a continuity failure, the fuse 7 or 8 will blow out during the door opening/closing operation while the car is stopped, and the car will be damaged. This will prevent you from restarting the
The car will not continue to operate in a state where the door opening control elements 2, 3 or the door closing control elements 4, 5 have a conduction failure. Therefore, even if the door opening control elements 2, 3 or the door closing control elements 4, 5 fail, passenger safety is ensured and the failure can be easily discovered.

FIG. 3 shows another embodiment of the invention.

In the figure, R, S, and T are three-phase AC power terminals, 1 is a three-phase induction motor that opens and closes the elevator door, 2, 3
are door opening control elements each consisting of a bidirectional thyristor inserted between terminal R and terminal S and motor 1, 4 and 5 are door closing control elements that also switch the input phase of motor 1, and 7 and 8 are terminal R, respectively. Fuses 9 and 10 inserted between terminal S and door opening control elements 4 and 5 are inserted between terminal R and terminal S and door opening control elements 2 and 3, respectively, and are closed when the car is stopped. This is a travel relay contact that opens while driving.

Even if the door opening control element 2 or the door opening control element 3 has a conduction failure while the car is running, that is, when the door closing control elements 4 and 5 are conducting, the travel relay contacts 9,
Since 10 is open, no current flows through the door opening control elements 2 and 3, and the electric motor 1 has door closing control elements 4 and 3.
Since the current continues to flow through 5, the door maintains the closing force.

Furthermore, when the car stops in the door-opening area and the door-opening control elements 2 and 3 are electrically connected, the door-closing control element 4
Or, if the door closing control element 5 has a continuity failure, the running relay contacts 9 and 10 are closed while the car is stopped, so the R-9-2-5 is closed as in the case of FIG.
-8-S or R-7-4-3-10-S power supply short circuit is formed, fuse 7 or fuse 8
will melt. As a result, no current flows through the door closing control elements 4 and 5, and the electric motor 1 is supplied with the door opening control elements 2 and 3.
The door opens because current flows through it.

In addition, if other elements such as thyristors are used as the door opening/closing control elements 2 to 5, and if the drive circuit (not shown) of the door opening/closing control elements 2 to 5 fails to conduct the door opening/closing control elements 2 to 5, It is clear that the same effect will occur in this case.

In addition, by connecting a door-openable section detection relay contact that closes within the door-openable section and opens outside the door-openable section in series with travel relay contacts 9 and 10, in the unlikely event that the car falls outside the door-openable section. Even when the door is stopped, the operation control device continues to issue the door closing command, so that even if the door opening control elements 2 and 3 have a conduction failure, the closing force of the door will not be lost.

As explained above, in this invention, a fuse is connected in series with the door closing control element that drives the elevator door in the direction of closing, and a contact that opens while the car is running is connected in series with the door opening control element that drives the door in the direction of opening. Even if the door opening control element has a continuity failure,
The door closing force is not lost, and it is possible to prevent accidents in which passengers force the door open and fall into the hoistway.
Even if the door-closing control element has a conduction failure, the door-opening force is generated when the car stops, and passengers can be prevented from being trapped inside the car.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional elevator door control device, FIG. 2 is a circuit diagram showing an embodiment of the elevator door control device according to the present invention, and FIG. 3 is a circuit diagram showing another embodiment of the elevator door control device according to the present invention. FIG. 1... Door opening/closing electric motor, 2, 3... Door opening control element, 4, 5... Door closing control element, 7, 8... Fuse, 9, 10... Traveling relay contact. Note that the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. A first door-opening control element and a first door-closing control element made of a semiconductor and connected in series between the power lines; a second door-closing control element made of a semiconductor and connected in series between the power lines; a door closing control element and a second door opening control element, a connection point between the first door opening control element and the first door closing control element, and the second door closing control element and the second door opening control element. A drive connected between the connecting point of the door and the drive unit, which is driven in the direction of opening the door by the first and second door opening control elements, and is driven in the direction of closing the door by the first and second door closing control elements. a fuse connected in series to the first and second door closing control elements, and a contact that is connected in series to the first and second door opening control elements and opens while the car is running. door control device.