JPS59163272A - Starter for winding drum type elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a starting device for a drum type elevator.

First, a conventional starting device for a drum-type elevator will be explained with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a schematic configuration of a drum type elevator, and FIG. 2 is a main circuit diagram of its starting device.

First, in FIG. 3, a three-phase induction motor 1 is connected to a winding drum 4 via a gear 2 and a speed reduction mechanism 3.

The winding drum 4 drives a hoisting rope 5, and the hoisting rope 5 winds up and lowers the car 8 via a pulley 6.

A pulley 6 is attached to a building 7.

On the other hand, in the main circuit of Fig. 2, the three-phase induction motor l
The R phase and S of the three-phase AC power supply are connected via the triac 11 and the normally open contact 10a of the magnetic contactor, and the triac 12 and the normally open contact tbb, respectively, to the winding drum configured as shown in Fig. 1.2. In a type elevator, the operation when starting the car will be explained.

When a rising operation command is given to the car 8, the contact 10a = lOc of the electromagnetic contactor is closed, the brake is released (not shown), and the triac 11 and 12 are ignited and the three-phase induction motor lOc is gradually reduced to Apply voltage to start car 8 smoothly.

Furthermore, when a descending command is given to the car 8, the contacts 10a to IOc of the electromagnetic contactors are closed in the same way as in the ascending operation, the brake is released, and the acceleration force that causes the car 8 to naturally descend due to its own weight. Using the acceleration force, triac 11
is turned off, the firing angle of the triac 12 is controlled, and the triac 12 is suppressed.

However, in cold regions, the friction coefficient of the gear oil of the hoisting machine decreases in the starting device of such a conventional drum type elevator, and the car may be moved downwards to another floor due to the load condition in the car, especially when there is no load. When calling, it may happen that the crab does not descend naturally even when the brake is released.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.When the vehicle cannot be lowered naturally, it is first operated in an ascending direction and then descended naturally. An object of the present invention is to provide a starting device for a winding drum type elevator that can prevent the engine from moving.

Hereinafter, embodiments of the starting device for a drum type elevator of this invention will be described based on the drawings. FIG. 3 is a block diagram of the control circuit of one embodiment, and in this FIG.
13 and 14 are the triac I1 shown in Fig. 2, respectively.
．． This is a gate circuit that controls the firing angle of 12.

The output of this gate circuit 13.0 is triac 1 in Figure 2.
The output of the gate circuit 14 is the same, and the signal is sent to the gate of the triac 12 in FIG.

Also in this invention, the main circuit of the three-phase sieve 4 motor 1 is
It is configured as shown in the figure.

The inlet end of the gate circuit 13 is connected to the output end of the starting pattern circuit 7 via a parallel circuit of normally open contacts 15a and 31a, and the input end of the gate circuit 14 is connected to the starting pattern circuit via a normally open contact 16a. It is connected to the output terminal of 17. This activation signal 17a is activated.

The normally open contact 15a is a contact that closes when an ascending command is given and opens when a descending command is given, and the normally open contact 16m is a normally open contact that closes when a traveling command is given.

The starting pattern circuit 17 is a circuit that generates a voltage that increases linearly with time when a starting command is given.

On the other hand, FIG. 4 is a circuit diagram of a rotation detection device for a three-phase induction motor I. In FIG. 4, terminals A to C are terminals of a three-phase AC tachometer generator (not shown). This three-phase AC tachometer generator is directly connected to the rotating shaft of a three-phase induction motor.
A three-phase AC voltage is generated in accordance with the rotation of the three-phase induction motor 1.

This terminal A-C is connected to an input end of a three-phase full-wave rectifier circuit 21. A smoothing capacitor 22 is connected between the positive and negative output terminals of the three-phase full-wave rectifier circuit 21, and a series circuit of resistors 23 and 24 is connected thereto.

The output terminal of the negative side 1 of the three-phase full-wave rectifier circuit 21 is grounded. A connection point between resistors 23 and 24 is connected to an inverting input terminal of an operational amplifier 26, and a non-inverting input terminal of this operational amplifier 26 is grounded via a resistor 25.

A resistor 2 is connected between the output terminal and the non-inverting input terminal of the operational amplifier 26.
7 is connected. Further, the output terminal of the operational amplifier 26 is connected to the base of a transistor 29 via a resistor 28.

The emitter of the transistor 29 is grounded, and the collector is connected to the power supply via the node 20.

This relay 20 is a relay that detects the rotation of the three-phase induction motor l.

FIG. 5 is a circuit diagram showing a sequence circuit that controls the control circuit of FIG. 3. In this FIG. 5, Ll and L2 are power lines, respectively, and the power line LZ has (+)
A voltage of (-) is applied to the power supply line L2.

A series circuit of a normally open contact 19a and a lifting relay 15 is connected between the power lines L1 and L2. Normally open contact 1
9m is a normally open contact of the off relay 19.

゛ A series circuit of the normally open contact 15a of the lift relay 15 and the travel command contact 30c (normally open contact) is connected in parallel to this normally open contact 19aK.

Additionally, a travel command contact 30 is provided between the power lines L1 and L2.
A (normally open contact) and the running relay 16 are connected in series.

Similarly, a series circuit of a travel command contact 30b (normally open contact) and an off relay 18 is connected between power lines Ll and L2.

Further, between the power supply lines LL and L2, there are a normally closed contact 20a of the relay 20, a normally closed contact 18a of the off relay 18, and a normally closed contact 15c of the rising relay 15.

A series circuit of off-relays 19 is connected.

The off relay 18 is an off relay that drops out after a certain period of time after a running command is given, and the off relay 19 is energized when the rising relay is off even if a certain period of time has passed after a running command is given, and then deenergized. This is an off relay that operates after the hind leg time.

Next, the operation of the starting device for a winding drum elevator according to the present invention constructed as described above will be explained.

Even if a descending operation command is given, if the car 8 shown in Fig. 1 does not descend naturally, the three-phase induction motor l is stopped, so no voltage is generated at terminals A, B, and C. The output voltage of operational amplifier 26 is zero, transistor 29 is off,
The lift relay 20 remains off.

When a certain period of time elapses after the travel command is given, the off-relay 18 is deenergized, so its normally closed contact 18a is closed, and the normally-closed contact 20a is also almost closed, so the off-relay 19 is energized.

By energizing this off relay 19, its normally open contact 19a
is closed, and the ascending relay 15 is energized. By energizing this lifting relay 15, its normally open contacts 15a, 15
b is closed. At this time, since the travel command has already been given and the temperature is at 0.degree. C., the travel command contact 30c is closed, and therefore, the lifting relay 15 is self-held by closing the normally open contact 15b.

In addition, when a travel command is given, the travel command contact 30a is closed, and accordingly the travel relay 16
is already energized. Therefore, the rising relay 1
5 and the travel relay 16, the normally open contact 15a shown in FIG.

16a is closed, and the incoming ends of the gate circuits 13 and 14 and the outgoing end of the activation pattern circuit 17 are connected.

As a result, an ignition command is given to the triac I1.12, and the car 8 starts to rise.

As described above, the ascending relay 15 connects to the start command contact 3.
0' c, when self-held by the normally open contact 15b, the off relay 19 is deenergized after a certain period of time, and the normally open contact 19a
is opened, so the ascending relay 15 is deenergized, the normally open contact 15a is opened, and the triac 11 is turned off.
After the car 8 has traveled once, dynamic friction occurs, so the car 8 easily starts to descend. After that, it will be operated by normal descending operation.

As explained above, according to the starting device for a winding drum type elevator of the present invention, when descending, the brake is released and the car is accelerated by its own weight to start, and the friction coefficient of the oil in the hoisting machine is low. This system detects that the car cannot be started, such as during extremely cold weather, and after operating the car upward for a certain period of time, the car is lowered by natural acceleration. have

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional winding drum type elevator;
The figure is a main circuit diagram of the three-phase induction motor of the winding drum type elevator shown in Figure 1, Figure 3 is a circuit diagram of the control circuit in the starting device for the winding drum type elevator of the present invention, and Figure 4 is the same as that of the winding drum type elevator. FIG. 5 is a circuit diagram of a sequence control circuit of the starting device for the drum-type elevator mentioned above. l... Three-phase induction motor, 8. Old... Car, 11
．． 12...Triac, 13.14...
...Gate circuit, 15...Rising relay, 16
...Travel relay, 17...Start pattern circuit, 18.19 Old...Off relay, 20...
・・Relay, 26・・・・Operation amplifier, 29・Old・
・Transistor. Note that the same reference numerals in the figures indicate the same or corresponding parts. Love 1 Figure O 2 Figure t a Figure procedure amendment (voluntary) 1. Indication of the case: Japanese Patent Application No. 58-39621 2, Title of the invention: Raising device for winding drum elevator 3, Person making the amendment Representative Hitoshi Katayama Department 4, Agent 5a Subject of amendment (1) Invention of the specification Contents of the amendment in Column 66 for detailed explanation (1) On page 3, line 14 of the FgJ specifications, the phrase "When natural descent is not possible," has been replaced with "When natural descent is not possible,"
” he corrected. (2) On the 16th line of the 4th page, it says "17a is input/output." [17a is now input. ” he corrected. 4371

Claims (1)

[Claims] When the car of a winding drum type elevator is operated downward, the brake is released and the car is started by its own weight.In the elevator, the brake is released and the car is started by its own weight.This device detects the start of the electric motor that drives the car. The present invention is characterized by comprising means for temporarily operating the car in an upward operation when it is detected that the car does not naturally descend even after a predetermined period of time has passed, and then shifting the car to a downward operation after a predetermined period of time. Starting device for body elevator.