JPS5812190B2 - Elevator landing control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a landing control device for a DC elevator.

In the so-called Ward Leonard device, in which the voltage applied to a DC motor for driving an elevator is changed by a motor generator to change the rotational speed of the DC motor, the field voltage of the motor generator is generally controlled by a voltage control device. It is being done.

As one means of constructing such a control device at low cost, it has been proposed to limit the output of the voltage control device to one direction, and to reverse the polarity using the contacts of a switching relay when output in the opposite direction is required. has been done.

In addition, in order to apply the voltage control device to devices such as elevators that have a lower load, that is, a load of negative polarity, it has been proposed to configure the device so that the output is output in the opposite direction as much as the load is supported. There is.

Figure 1 shows the input/output characteristics of this voltage control device.

In FIG. 1, V1 is the saturation level voltage in the positive direction, V2
is the saturation level voltage in the negative direction.

In order to configure the control device at low cost, V1<V2 is satisfied, and (2) is selected to be large enough to support the lowering load.

(For example, during heavy load descending operation, when the speed reaches zero, the load is supported by voltage ■2.

) Now, for example, when a car is driven in a downward direction and lands on a called floor, if for some reason the car goes too far beyond the landing level (planned landing error range), the contacts of the switching relay will The polarity of the voltage controller is reversed to energize the generator field.

As a result, the car is operated in an upward direction and again within the landing level.

This is called overshooting and re-alignment operation.

When this switching relay contact operates, the voltage applied to the generating electromagnetic field becomes discontinuous, giving an unpleasant shock to passengers in the car.

In addition, each time the over-travel re-alignment operation is performed, the above-mentioned switching contacts operate to cut off the generator field current, which causes severe wear on these contacts. This method has the disadvantage that an expensive contactor must be used.

This invention solves the above-mentioned drawbacks, and even when an inexpensive voltage control device is used, it is possible to achieve a comfortable over-travel re-alignment operation, and the output of the voltage control device can be switched using a small contact. The purpose of the present invention is to provide an elevator landing control device.

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

In the figure, 1 is a speed command generator that generates a running speed command signal for the elevator, 2 is a landing device that generates a floor landing speed command signal shown in FIG. 5, and 3 is one of the above speed command signals and a speedometer. This is the output of the power generator 4.

An adder 5 for adding speed signals, a voltage control device 6 which inputs the output of this adder 3 and has input/output characteristics shown in FIG.
is the field of the motor generator, 7 is its armature, 8 is the armature of the hoisting machine that drives the sheave 9 of the hoisting machine, 10 is the field, and armatures 7 and 8 are well-known Ward Leonard devices. It consists of

11 is the main rope connecting the heel 12 and the counterweight 13; 14 is the floor; 15 is the cam attached to the car 12; 16, 17
is a landing position detection switch installed in the hoistway, 16
a, 16b, 17a, 17b are normally closed contacts, 18 is ground, 21 is an upward operation relay, 21a to 21g are normally open contacts, 21h is also a normally closed contact, 22 is a downward operation relay, and 22a to 22g are Its normally open contact, 22h, is also a normally closed contact, 23 is a front floor detection relay, 23a, 23b are its normally open contacts, 23c is also a normally closed contact, and contact 2
1a, 21b, 22a, and 22b are used to switch the output of the landing device 2 shown in FIG. 5 by raising or lowering it to match the input/output customization of the voltage control device 5.

Contacts 21c, 21d, 22c, and 22d switch the output of the voltage control device 5, which has input/output characteristics as shown in FIG. It is designed to be able to output both positive and negative polarity output voltages.

Further, the contacts 21e, 21f, 22e, and 22f are connected between the speedometer generator 4 and the adder 3, and are configured to provide negative feedback regardless of whether the engine is running up or down.

In addition, when the relay 23 is energized by the contacts 23a and 23c, the output of the speed command generating device 1 is the same, and when the relay 23 is de-energized, the output of the landing device 2 is
The output of is inputted to addition 3 as a speed command signal.

24 is a landing relay, 24a is its normally closed contact, 25 is a rising call relay contact that is closed when there is an ascending call, 2
6 is a descending call relay contact that is closed when there is a descending call; 27 is a deceleration relay contact that is closed at the start of running and opens when a deceleration command is given to the car 12; 28 is a timed relay of the limited return type; 28a is its normally open contact, (+) (-)
is a DC power supply.

Note that the saturation level voltage V3 in the negative direction in FIG. 4 is selected to be large enough not only to support the lowering load but also to provide a landing speed.

Now, when the car 12 is operating downward, the contacts 26 are closed, the contacts 27 are closed and the front floor detection relay 23 is energized, and the contacts 23f are open and the landing relay 24 is activated. The contact 24a is deenergized and closed.

Therefore, the time relay 28 is energized and the contact 28a is closed.

Therefore, the descending operation relay 22 is (+)-28a-2
It is self-maintained by the 2g-21h-22-(-) circuit.

Further, the contacts 22a to 22f are closed.

The car 12 approaches the floor 14, and the cam 15 closes the switch 16.
When engaged, the contact 16a opens.

At this time, since contact 27 is already open, relay 2
3 is deactivated.

As a result, the contact 23a is opened and the contact 23c is closed, so that the input to the adder 3 is switched from the output of the speed command generation device 1 to the output of the landing device 2.

When the car 12 further descends and reaches the landing level, the cam 15
leaves switch 16.

As a result, 16b is closed, and (+)-16b-17b-2
3f-24-(-) circuit energizes relay 24,
Contact 24a is open.

However, the time relay 28 does not return immediately, and the contact 28
Since a is not opened, the relay 22 is not deenergized.

When the car 12 stops in this state, the landing operation is completed, but if the car 12 goes too far beyond the landing level for some reason, the cam 15 engages with the switch 17.

As a result, contact 17b is opened, relay 24 is deenergized, and contact 24a is closed.

Therefore, timed relay 28 is energized again.

Then, as shown in FIG. 5, the landing device 2 generates an output in the opposite direction to the previous one, this output is increased by the voltage control device 5, and the generator field 6 is generated in the opposite direction to the previous one. Excited.

The car 12 is therefore driven in an upward direction and enters the landing level again.

In other words, an over-travel re-alignment operation is performed.

During this time, regardless of the nominal direction, that is, contact 25.2
Regardless of whether 6 is opened or closed, (+)-28a-22g-21h
-22-(-) or (+)28a-21g-22h-
In the circuit 21-(-), the operating state of the descending operation relay 22 and the ascending operation relay 21 before the re-alignment operation is maintained, so there will be no shock due to switching of the relay during the over-reaching re-alignment operation. do not have.

As a result, when driving to the landing level by over-travel re-alignment, the operating range of the voltage control device 5 becomes the output range in the negative direction, but the saturation level in the negative direction is determined by adding the landing speed to the load. It's about the same size as the implantation level.12
It is possible to move the

As explained above, the present invention uses a voltage control device that emits outputs with positive and negative polarities with different saturation levels, and switches the output of this voltage control device with contacts depending on the running direction of the car to generate a generator field. During over-travel re-flooring operation, the landing speed command is given while maintaining the operation of the switching contacts that were operating previously, regardless of the direction of car movement direction. .

This makes it possible to realize a re-flooring operation with good riding comfort, increase the life of the contacts of the switching relay, and make it compact and inexpensive.

[Brief explanation of drawings]

FIG. 1 is an input/output characteristic diagram of a conventional voltage control device, FIG. 2 is a configuration diagram showing an embodiment of an elevator landing control device according to the present invention, and FIG. 3 is a control circuit diagram of FIG. 4 is an input/output characteristic diagram of the voltage control device of FIG. 2, and FIG. 5 is an input/output characteristic diagram of the landing device of FIG. 2. 1... Speed command generator, 2... Landing device, 3...
- Adder, 4... Speedometer generator, 5... Voltage control device, 6... Generator field, 7... Armature, 8...
・Electric motor armature, 12...Elevator car, 16,
17... Landing position detection switch, 21... Ascending operation relay, 22... Descending operation relay, 23... Front floor detection relay, 24... Floor landing relay, 25... Ascending call relay Contact, 26...Down call relay contact, 28...
・Timed return type timed relay.

Claims (1)

[Claims] 1 A DC motor for driving the car controlled by a Ward Leonard device, a landing device that issues a landing speed command to stop the heel within the landing error range, a positive and negative motor that operates according to the landing speed command and has different saturation levels. A voltage control device that outputs a polarized output and controls the generator field of the Ward Leonard device, and a voltage control device that is inserted between the voltage control device and the generator field and controls the output of the voltage control device depending on the running direction of the car. The car is equipped with a switching contact to switch, and when the car goes too far outside the landing error range of the floor on which it should land, the landing speed command is issued while maintaining the operation of the switching contact that had been operating up to that point. An elevator landing control device that applies the generator field.