JPS6141655Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reverse running protection device for a cableway.

Cableway equipment must be fully protected against running in the wrong direction, as this could lead to a serious accident if the cableway were to run in the wrong direction. Particularly in the case of a traveling ropeway, if the ropeway runs in the wrong direction when starting up, the carrier will rush into the platform, creating a very dangerous situation.

There are two main reasons why the ropeway runs in the wrong direction:
There is a point. The first cause is as shown in Figure 1.
When operating with the No. 1 carriage 22 empty and the No. 2 carriage 23 up and full, if the brake is released at the same time as the operation command, the load of the No. 2 carriage will cause the No. 1 carriage to temporarily reverse in the opposite direction. This is a case of running. The second cause is when an output signal with a reverse polarity is output due to some kind of failure in the automatic control system, causing the vehicle to run in the opposite direction.

Conventionally, in response to the first cause of driving in the wrong direction, the brakes were released after a short time limit after the driving command was issued, but in the case of the second cause of driving in the wrong direction, the brakes were released. The reality was that no protection was being provided, and this was becoming a problem.

The present invention is applicable to cableways such as ropeways.
In order to prevent running in the wrong direction, the main circuit DC current is detected when the main motor is started and the brake is activated again, and the polarity of this current is determined to determine whether the current polarity is in the specified rotation direction. A current polarity discrimination circuit is provided, and the output signal issued from this current polarity discrimination circuit is compared with the signal of the specified rotation direction. If the result is that the current polarity is normal polarity corresponding to the specified rotation direction, the brake is released and the operation is started. do the
It is an object of the present invention to provide a reverse running protection device which prohibits the operation of a cableway when reverse polarity is detected due to some kind of failure in a control system.

The present invention will be explained below based on an embodiment shown in the drawings.

FIG. 2 is a circuit diagram showing an embodiment of the present invention.

In Fig. 2, 1 is a DC motor, 2 is a thyristor power supply, 3 is a no-fuse or disconnector that protects the main circuit, 4 is a contactor that opens and closes the main circuit,
5 is a shunt for detecting current; 6 is a current polarity discrimination circuit that inputs the current detected from shunt 5; 7 is a contact that is output from the current polarity discrimination circuit 6 when the current detected from shunt 5 has positive polarity; 8
is the contact output from the current polarity discrimination circuit 6 when the current is negative polarity, and 9 is the contact output when the rotation direction is selected as normal rotation.
10 is a contact that turns on when the rotation direction is selected as reverse; 11 is a driving command; 12 is an auxiliary relay for determining whether the polarity of the current is normal or abnormal; 13 is a contact that turns on when the main motor 1 is started ( (After the brake is released) A contact of the auxiliary relay 12 that shorts the contacts 7, 8, 9, and 10 and is used as a brake operation command signal. 15 is a timer that counts the time after the operation command 11 is turned ON. 16 is a contact that is used as a brake operation command signal. timer 1
5 is the normally closed contact of the auxiliary relay 12 for cutting off the excitation, 17 is the auxiliary relay that operates when normal polarity is not detected within a certain time after the operation command 11 is turned on, and 18 is the normally closed contact of the auxiliary relay 12. Contact, 1
Reference numeral 9 is a time-limited close contact of the timer 15, and 20 is a normally open contact of the auxiliary relay 17, which is used as a failure signal.

The operation of the present invention having the above configuration will be explained. First, when the rotation direction of the main motor 1 is selected to be forward rotation, the polarity of the current that flows when the brake is still operating at startup is set as positive polarity, and the polarity of the current that flows when reverse rotation is selected is set as negative polarity. When the driving command is turned on with forward rotation selected, if the control system is operating normally, the current polarity determination circuit 6 outputs a positive polarity contact 7.

At this time, the points 9 and 11 were connected in series with the contact 7.
has already been turned on, so when contact 7 is output, auxiliary relay 12 is energized and a brake signal is output.

At this time, the timer 15 counts the time from when the operation command 11 turns ON until the contact 18 turns OFF, and the auxiliary relay 17 does not operate because the contact 18 turns OFF within the time until the timer contact 19 turns ON. Therefore, the fault contact 20 is not outputted.

Next, when a current of opposite polarity flows with the same forward rotation selection, the current polarity determination circuit 6 outputs the contact point 8. At this time, since the contact 10 connected in series with the contact 8 is in an OFF state, the auxiliary relay 12 does not operate, and therefore the brake signal 14 is not output. Since the contact 18 of the auxiliary relay 17 does not turn OFF, it operates when the contact 19 of the timer 15 turns ON, and the failure contact 20 is output.

In this way, it is possible to prevent reverse running at the time of startup.

[Brief explanation of drawings]

Figure 1 is a diagram showing the basic configuration of the ropeway.
FIG. 2 is a circuit diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... DC motor, 2... Thyristor power supply device, 3... No fuse circuit breaker, 4... Contactor, 5... Shunt, 6... Current polarity discrimination circuit, 9, 10... Rotation direction signal contact, 12,17
...Auxiliary relay, 15...Timer.

Claims (1)

[Scope of utility model registration request] In a reverse running protection device for a cableway that raises and lowers a carrier by forward and reverse operation of a DC motor, there is provided a current polarity discrimination circuit that detects the current direction of the DC motor, and a current polarity discrimination circuit that detects a driving command direction and a current direction when the cableway is started. A reverse run protection device for a cableway, comprising a control circuit that releases the brake and starts traveling when the brakes are detected to coincide with each other.