JPS586851Y2 - Elevator door opening/closing control device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an elevator door opening/closing control device.

Many elevator doors are automatically opened and closed by electric motors.

In order to smoothly open and close the door, the driving torque at the beginning and end of the opening and closing of the door is usually reduced.

For this reason, small foreign objects caught in the sill groove at the start of opening/closing, stiffness in the linkage that transmits the opening/closing force, or eccentricity of the door can cause the door to stiffen and become unable to open or close, resulting in burnout of the drive motor or damage to the drive motor. This may cause passengers to become stuck in the seats.

This stubbornness is called an electric lock, and in cases like this, the cause is simple, and it can be easily recovered by opening and closing the door in that position several times, or by repeatedly turning the drive motor on and off. There are many things.

For this reason, conventionally, when the door opens and closes, it is counted by a timer and if the operation is not completed within a certain period of time, it is determined that the door is locked electrically and the opening and closing operation is repeated.

For this reason, the door opening/closing relay requires a spare contact point to drive the timer, and the timer device is thick, which results in a large door opening/closing control device.

The purpose of this invention is to eliminate the drawbacks of the prior art described above.
An object of the present invention is to provide an extremely simple elevator door opening/closing control device for preventing electric locking. When electric locking occurs, the door opening/closing driving motor remains energized.

Therefore, the armature voltage of this motor is detected, and if it is energized for longer than the normal door opening/closing time, it can be considered that an electric lock has occurred.

By the way, as mentioned at the beginning, in elevator door control, in order to make the opening and closing of the door smooth, the driving torque is reduced at the end of the opening and closing of the door.

For this purpose, as shown in the examples below, a control resistor is connected in series with the armature of the door drive motor, and the resistance value is increased at the door opening and closing ends to suppress the speed of the motor. is commonly practiced.

Therefore, the armature current and voltage will be suppressed at the door open and closed ends.

For this reason, if armature current or voltage is applied to the thermal timer, the operating time of the thermal timer at the door opening and closing ends will be long, making it difficult to provide quick protection.

In particular, at the closed end and the open end, objects such as foreign objects, stiffness, and passengers often get caught, and such operational delays at the closed end and the open end pose a major problem.

The present invention was developed in view of this point, and its feature is that the terminal voltage of the series circuit of the door drive motor armature and the control resistor is applied to the thermal timer, and the door is opened or closed by the contact. By cutting off the command operation, highly stable door control is possible with an extremely simple and economical configuration.

The present invention will be explained below with reference to an embodiment shown in the drawings.

Figure 1 shows →1 of the thermal timer,
γ is a movable contact piece made of bimetal, 5 is a fixed contact piece, and these two liquid pieces are fixed facing each other with a fixing screw via an insulator 6, and a heater 9 is attached to the bimetal movable contact piece 1. is wrapped.

1 and 2 are terminals of the heater 9, and 3 and 4 are terminals of a bimetal timer.

In the above configuration, when the heater 9 is energized, the bimetal 1 is heated by the heater 9 and bent in a direction away from the assumed contact piece 5, and the conduction between the terminals 3 and 4 is broken.

At this time, if the current of the heater 9 is properly cut off, the bimetal T
cools down and the continuity between terminals 3 and 4 is restored.

Figure 2 is a control circuit diagram, where 10a is the elevator operation relay, 100a is the departure relay contact, DZ is the door zone check switch, A is the door close relay, B is the door open relay, T is the thermal timer, and Tb is its normally closed contact (5, 1 in Figure 1), CLS is the door opening switch, OLS is the door opening limit switch, SF is the motor field winding, R1 is the field resistance, M is the motor armature, R2 is a control resistor, and P is a control contact.

Next, the door closing operation will be explained.

When the door closing relay A is energized by the elevator departure relay contact 100a, the contact Aa of the motor circuit closes and the motor closes the door, and when it is completely closed, the limit switch C is activated.
LS turns off, door closing relay A demagnetizes, and contact A'a
Turn off to end the closing operation.

When the door closes and the elevator departs, operation relay contact 1
The contact 0a closes, keeping the door closing relay A in a standby state.

When the elevator reaches the destination floor, the door zone check switch DZ is turned on to check that the door is completely opened.

When the elevator stops, elevator operation relay contact 1
0b is turned on, door opening relay B is energized, contact Ba of the motor circuit is closed, the motor armature current is reversed and the door is opened, and when it is completely opened, the limit switch OLS is turned off and the door opening operation is started. finish.

In the figure, the timer T connected in parallel with the armature M is the first
In the thermal timer illustrated in the figure, terminals 3.4 are connected to both ends of the armature M.

Further, assume that its characteristics are, for example, an initial operation time of 15 seconds, a recovery time of 15 seconds, and a repeated operation time of 7 seconds.

Now, if the door is stuck at the start of the closing operation, the limit switch CLS will not turn off even after the regular closing time of 3 seconds has elapsed, so the thermal timer T will operate after 15 seconds, its contact Tb will turn off, and the closing relay A will turn off. Demagnetize.

After 15 seconds, relay A sends current to the energized motor again, but if it is still stubborn, it will repeat the operation of turning on for 7 seconds and turning off for 15 seconds until the door closes.

The same applies to opening the door.

Elevator door opening/closing devices are required to be small and lightweight because they are mounted above the elevator corner.

For this reason, conventionally there was almost no space to store a dedicated timer, and the timer was installed in the elevator machine room.

For this reason, the contacts of the door opening/closing relay had to be led to the machine room using an expensive tail cord, which was uneconomical.

However, according to this invention, the thermal timer is small and can be easily incorporated into the door opening/closing device, making it extremely economical.

Further, it has great effects such as eliminating the need for the contacts of the door opening/closing relay that were required for driving the timer.

Note that the thermal timer T is also effective even if it is connected in series to the armature circuit.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being a configuration diagram of a thermal timer, and FIG. 2 being a circuit diagram. 5...Fixed contact piece, 6...Insulator, 7.
... Bimetal movable contact piece, 9 ... Heater, A ... Door closing relay, B ... Door opening T ... Thermal timer, Mar contact. Ray, M...Armature, Tb...Thermal tie

Claims (1)

[Scope of utility model registration request] an elevator door, a motor for driving the door, a resistor for controlling the motor speed connected in series with the armature of the motor for driving the door, and a resistor for controlling the motor speed connected in series with the armature of the motor in response to door opening and closing commands. a thermal timer to which a terminal voltage of a series circuit is applied between the motor armature and the control resistor; the thermal timer operates according to the duration of application of this terminal voltage; Open or close command operation? An elevator door opening/closing control device characterized by comprising a thermal timer contact that shuts off.