JPS6312034B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting moving objects when a certain number of moving objects are always present on a moving path in a specific area, such as within the premises of a steel manufacturing plant. The object of the present invention is to provide a device of this kind that is inexpensive and can reliably detect abnormalities in the device.

The moving objects referred to here include railway vehicles, self-propelled vehicles, crane trucks, etc. in specific areas such as the premises of the above business offices,
The target is moving objects that travel on a fixed path, such as transportation vehicles between factories. Therefore, it is difficult to apply a detection device for a moving object such as a railway vehicle that transports general passengers to detect such a target moving object due to the cost, and a simpler and cheaper device is difficult to apply. Generally, this is required.

Conventionally, as the simplest type of moving object detection device, a device based on a so-called next check-in reset method has been used. The outline of the device based on this method will be explained with reference to Fig. 1. A in the figure shows a block section in the travel path LX of a vehicle T, which is a moving body, and is equipped with a transmitter TX and a transmitting antenna TA.
The running path
Install loop antennas La, Lb, and Lc along LX, and receive circuits RXa and RXa for each loop antenna, respectively.
FIG. 3 is a state diagram of a device arrangement in which Rxb, RXc and receiving relays Ra, Rb, and Rc are connected as shown. Figure B is a block control circuit diagram showing the control relationship between block sections aT, bT, and cT, and is shown in blocks.
RLa is the block section for vehicle T moving in the right direction
The block logic circuit for aT, LLa is the block logic circuit for this section for leftward travel, and aTR is the vehicle detection relay for this section. Block sections bT and cT also have block logic circuits similar to section aT as shown in the figure.
RLb, LLc, RLc, LLc, vehicle detection relay bTR,
There is cTR. Note that contacts Ra, Rb, and Rc are contacts of receiving relays Ra, Rb, and Rc, respectively (hereinafter, contact symbols are shown using the same symbols as the relays to which they belong).

To summarize the operation of the device illustrated in Fig. 1 above, the vehicle T is
When in bT, transmitter TX to transmit antenna TA
The signal wave f transmitted via loop antenna Lb
When the signal is received by the receiving circuit RXb via the receiving circuit RXb, the receiving relay Rb operates. When the vehicle T is moving to the right, the operation of the reception relay Rb causes the vehicle detection relay bTR, which had been operating until then, to recover due to the action of the block logic circuit RLb, and detects the presence of a vehicle, and also blocks the block logic circuit RLb. , a reset signal is sent to the block logic circuit RLa of aT, which is the rear section in this case, and the vehicle detection relay aTR, which is in the recovery state,
make it work. In this way, the presence or absence of a vehicle, that is, a moving object, in each block section is detected by the operation and restoration of the vehicle detection relay in each block section.

However, in the above-mentioned device, if a disconnection accident occurs in the loop antenna or the transmission line connecting the loop antenna and the receiving circuit, the receiving relay will not operate, so even though there is a moving object on the loop antenna, The moving object detection relay remains activated and cannot be detected, and the reset signal is not sent to the rear section, so the detection relay for the rear section is in the recovery state, so it is as if a moving object has stopped in the rear section of the loop antenna. This makes it impossible for the detection device to detect failures. Therefore, as shown in Figure 1A, a loop antenna is installed.
Separate transmitters Sa, Sb, Sc, and receiver circuits as loop disconnection detection devices for La, Lb, and Lc.
CHa, CHb, CHc, receiving relay CHaR, CHbR,
It was necessary to install a CHcR or the like and constantly transmit and receive signals with a frequency different from the signal transmitted from the mobile unit to monitor the above-mentioned disconnection accident. In addition, if a failure occurs in a device mounted on a mobile object, when the mobile object enters the block section that existed at the time of the failure, the reception relay is activated by the signal transmitted before the failure and is in the state of detecting a moving object. After the failure, the detection state is not resolved, and even if the moving object continues to enter the forward section, it will appear as if it were in the block section at the time of the failure. Therefore, in this case, it is necessary to perform failure detection on the moving body.

As mentioned above, conventional next-check-in-reset type devices require the above-mentioned disconnection detection device, failure detection device on the moving object, etc. in addition to block logic circuits, moving object detection relays, etc., making the device configuration complicated. Therefore, the cost could not be avoided.

The present invention provides a plurality of block sections on a travel path for moving objects in which a certain number of moving objects are always present and in a limited area, and a loop antenna is installed along the length of each section along the travel path. In the moving object detection device that receives a signal wave unique to the mobile body transmitted from the top of the mobile body via the loop antenna, the signal wave unique to each mobile body transmitted from the top of the mobile body is received in the block section. A receiving relay that receives signals and operates for each moving body through a loop antenna provided for each moving body, and the operating contacts of the receiving relay for each moving body are connected in parallel for the number of total block sections, respectively. An anomaly detection circuit that constitutes an excitation circuit of the anomaly detection relay, an anomaly information output circuit formed by connecting operating contacts of the anomaly detection relays for each moving object in series for the number of all moving objects, and a recovery contact of the receiving relay. a moving object presence information output circuit connected in series for each block section by the number of all the moving objects; and a moving object presence information output circuit for each block section connected in series. This system is equipped with a moving object detection circuit, which detects moving objects in each block section, and also makes it possible to detect failures in the device.Furthermore, the block logic circuit shown in Fig. 1 is omitted, and the moving object detection circuit is simplified. It has become.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

The moving route L shown in Fig. 2A is a specific closed area as mentioned earlier, and its entire length is divided into sections 1T, 2T, ......5T, and each section has a Loop antennas L1, L2, L5 spanning the section length along the running route L
has been installed. Each loop antenna has a receiving circuit RX11, RX21,... as shown in the figure.
......RX51 and receiving relays R11, R2
1,……R51 is connected and the running route L
Above is a mobile body T1 equipped with a transmitter TX1 and a transmitting antenna TA1, which constantly sends out a signal wave f1 to the ground. In other words, A in the figure shows 1 on the running path L.
This is an example where there are two moving objects.

In the above case, the mobile body T1 uses the loop antenna L1
~L5, the transmitted wave f1 from the mobile body T1 is received by any of the receiving circuits RX11 to RX51 via any of the loop antennas, and any of the receiving relays R11 to R51 It's working. Therefore, the abnormality detection relay R0 shown in FIG.
1, that is, the relay R01 is energized through the operating contacts of the receiving relays R11 to R51 in parallel, and is always in operation via the contact of the receiving relay which is in operation.

Therefore, if the sending of the transmission wave f1 is cut off due to a failure in the transmitter TX1 and the transmitting antenna TA1 on the mobile body T1, all of the receiving relays R11 to R51 will be in the recovery state, so the excitation circuit of the abnormality detection relay R01 is disconnected, relay R01 is restored, and an abnormality is detected. In addition, if the receiving relay does not operate due to a disconnection of the loop antenna or the transmission line connecting the loop antenna and the receiving circuit, or a failure of the receiving circuit, the abnormality detection relay R01 is restored when the mobile object T1 enters the relevant fault section. to detect abnormalities.

In addition, as shown in Figure C, the abnormality detection relay R
“Normal” using the circuit through the 01 operating contact.
As shown in FIG. By making the "normal" condition one of the locking conditions of the lock circuit or one of the conditions of "moving object can run," the above-mentioned "no moving object" information can be used to create a fail-safe system. A control circuit can be configured.

FIG. 3A is an example of a case where there are two moving bodies on the traveling path L, that is, a moving body T2 in addition to the moving body T1 in FIG.
is being sent. In this case, in addition to the receiving circuit and receiving relay shown in Fig. 2, receiving circuits RX12 to RX are connected to loop antennas L1 to L5, respectively.
52 and receiving relays R12 to R52 are connected as shown. In this case, the transmitted waves f1 and f2 have different frequencies unique to the mobile bodies T1 and T2, respectively, and the receiving circuits RX11 to RX51 receive the transmitted waves f1,
Of course, the receiving circuits RX12 to RX52 each select and receive the transmission wave f2.

Figure B shows the excitation circuit of the abnormality detection relay R01 based on the parallel operating contact conditions of the receiving relays R11 to R51, and C shows the excitation circuit of the abnormality detection relay R01 based on the parallel operating contact conditions of the receiving relays R12 to R52, as shown in Figure 2B. This is an excitation circuit for abnormality detection relay R02. D in the same figure outputs "normal" information to the outside through the operating contacts of abnormality detection relays R01 and R02 corresponding to the transmission waves specific to each mobile body shown in B and C in the same figure, and outputs "normal" information to the outside, is the receiving relay R11,R for each block section.
This is a circuit that outputs the information that there is "no moving object" in the block section via the recovery contacts 12 to R51 and R52 in series, and the operation of the circuit in Figure D is the same as that of the circuit in Figure 2 C. , and the circuit in Fig. 3E is the second
It goes without saying that the operation is similar to that of the circuit shown in Figure D. FIG. 4 is an example of a circuit that specifically detects a moving object based on the configuration shown in FIG.
1. The operating contact of R02 is operating unless there is an abnormality in the equipment, and if there is no moving object in the block section 1T, the operating contacts of receiving relays R11 and R12 are both restored, so a moving object is detected. Orbital relay 1TR is working. That is, it is detected that there is no moving object in the block section 1T. If a moving object is present in the block section 1T, either of the operating contacts of the receiving relays R11, R12 will operate, and the moving object detection track relay 1TR will be restored. That is, block section 1T
This is the detection of the presence of a moving object.

If there is an abnormality in the equipment, the operating contacts of receiving relay R11 or R12 will not operate, but instead the operating contacts of abnormality detection relay R01 or R02 will be restored, so moving object detection track relay 1TR will be restored.
Detects a moving object. At the same time, all operating contacts of moving object detection track relays 2TR to 5TR are restored, so a moving object is present in the fully blocked section, but this is a fail-safe concept.
Unavoidable.

Furthermore, if the equipment returns to normal, the moving object detection track relays 1TR to 5TR will operate, leaving the sections where they actually exist, so normal detection can be returned immediately.

As shown in the above embodiments, the moving object detection device of the present invention has an extremely simple circuit configuration, and is capable of immediately detecting an abnormality when a transmission wave stops due to an abnormality in transmission. When a mobile object receives a reception failure due to a fault, it detects the abnormality when it enters the faulty block section, and does not require the addition of a conventional disconnection detection device or failure detection device, providing an overall low-cost device. can. Therefore, the present invention can be applied to fields where mobile object detection devices cannot be applied due to high cost, and has extremely significant effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional next-check-in-reset type moving object detection device. 3 shows an embodiment of the moving object detection device of the present invention. FIG. Figure C is an abnormality information output circuit diagram.
Figure 3D is a mobile object presence information output circuit diagram, Figure 3A is a device arrangement diagram when there are two mobile objects on the road, Figures B and C are an abnormality detection circuit diagram, and Figure 3D is an abnormality information output circuit. FIG. 4 is a circuit diagram for outputting moving object presence information, and FIG. 4 is a moving object detection circuit diagram. T1, T2...Moving body, L...Running path, L1,
L2,……L5……Loop antenna, 1T,
2T,……5T……Block section, RX11,
RX21,……RX51, RX12, RX22,
…RX52……Receiving circuit, R11, R21
…………R51, R12, R22…………R52
...Receiving relay, R01, R02... Abnormality detection relay, 1TR, 2TR, ...5TR... Moving body detection trajectory relay.

Claims (1)

[Claims] 1. On a moving path where a fixed number of moving objects are present at all times and in a limited area, multiple block sections are set along the moving path in which loop antennas are installed over the length of each section. In a moving object detection device that receives a signal wave transmitted from above the body via the loop antenna, the signal wave unique to each moving object sent from above the moving object is received via the loop antenna provided for each of the block sections. A receiving relay that receives and operates for each of the moving bodies and operating contacts of the receiving relays for each moving body are connected in parallel for the number of total block sections to configure an excitation circuit for an abnormality detection relay for each moving body. an abnormality detection circuit that connects the operating contacts of the abnormality detection relays for each of the moving objects in series for the number of all moving objects; a moving object detection circuit formed by connecting in series the abnormality information output circuit and the moving object presence information output circuit for each block section in series. A moving object detection device characterized by: