JPH0546542Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention sets uninsulated boundaries at intervals on the rails that make up a railway track, and transmits signals from a transmitter placed near one of the boundaries through the rails. This invention relates to an uninsulated track circuit that receives a transmitted signal wave at a receiving section located near the other boundary.

<Conventional technology> As a conventional non-insulated track circuit of this type, the
The one disclosed in No. 50-7807 is known. Third
The figure shows this conventional uninsulated track circuit diagram, where R ₁ ,
R ₂ is the rail on both sides of the continuous railway track, 1 is the rail
At the boundary point a of the blocked section that separates the required sections of R ₁ and R ₂ , a series resonant circuit connected across the rails R ₁ - _{R 2} , 2 is installed at the train advancing end side of the blocked section. transmitter for transmitting signal waves, 6
1 and 62 are transmitter coils connected in series between the transmitter 2 and the rails R ₁ and R ₂ , respectively close to the rails;
7 is a receiving coil provided between the rails R ₁ and R ₂ on the train approach end side of the blocked section, 3 is a receiver, 4 is a relay, and 5 is a signal provided near the boundary a. The series resonant circuit 1 is designed to resonate with the frequency of the signal wave output from the transmitter 2.

Here, when the train is running within the blocked section, the signal wave transmitted from the transmitter 2 is not sent backward due to a short circuit between the tracks due to the axle of the train.
Receiver 3 is not working, relay 4 has fallen,
The traffic light 5 is, for example, in an R display.

Next, immediately after the train advances and passes the boundary point d of the blocked section, the rail impedance of the track circuit becomes low, and most of the signal waves are transmitted from the transmitter 2 - transmitting coil 61 - rail R ₁ - axle - rail R ₂ - transmitting coil 62, and this short-circuit current generates an induced current in the rails R ₁ and R ₂ . This induced current flows in the loop formed by the axle - rail R ₁ - series resonant circuit 1 - rail R ₂ , and the magnetic flux generated by this is picked up by the receiving coil 7, the receiver 3 is activated, and the relay 4 is activated. The vehicle is lifted up, and the traffic light 5 switches from an R display to a Y display. The train continues,
When the train enters the inside of the blocked section of the forward track circuit to a certain extent, the short circuit current caused by the train disappears, and therefore the induced current also disappears, but the rail impedance of the track circuit becomes high and most of the signal waves from the transmitter 2 are Since the voltage is applied as a voltage across the rail, the operation of the receiver 3 continues.

<Problems to be solved by the invention> However, in the conventional non-insulated track circuit described above, since two transmitting coils 61 and 62 are required in the transmitting section, there are many components, and the cost, reliability, and There are some issues with security, etc. In particular, recently, in consideration of the ease of track maintenance work, it has been attempted to avoid installing equipment that would obstruct maintenance and inspection work within the track bed as much as possible. As before, there are two
In the configuration in which two transmitting coils 61 and 62 are installed,
During maintenance and inspection work, the transmitting coils 61 and 62 can be difficult to carry out, and the above-mentioned requirements cannot be met.

<Means for solving the problems> In order to solve the above-mentioned conventional problems, the present invention provides an uninsulated track circuit including a pair of rails, a transmitting section, and a receiving section, The rail constitutes a railway track and has an uninsulated boundary set at a distance in the length direction of the rail, and the transmitter includes a transmitter and a transmitter coil, and the transmitter includes a transmitter and a transmitter coil. The coil is arranged near one of the pair of adjacent non-insulated boundaries, forming a spiral coil in which opposing coil sides follow the pair of rails, and one of the coil terminals is located near one of the non-insulated boundaries of the pair of adjacent non-insulated boundaries. one of the two output terminals of the transmitter is connected to the other of the coil terminals of the transmitting coil, and the other is connected to the other of the pair of rails, and the receiving The input sides of the sections are respectively connected to the pair of rails in the vicinity of the other uninsulated boundary of the pair of adjacent uninsulated boundaries.

<Function> The transmitting coil is placed near one of the adjacent uninsulated boundaries, and the coil sides form a spiral coil along the pair of rails. This allows the transmitter coil to be deeply magnetically coupled to both rails. Therefore, the signal wave for transmission can be supplied to the rail with little loss, and the signal wave can be efficiently transmitted to the receiving section of the track circuit.

Moreover, since the magnetic flux caused by the increased current in the transmitting coil immediately after the train advances is deeply coupled to the rail and a large induced current is sent to the receiving end, the train detection point when the train advances is performed near the outside of the transmitting coil. Therefore, a clear boundary close to that of an insulated track circuit is obtained.

Furthermore, one of the coil terminals of the transmitting coil is connected to one of the pair of rails, and one of the two output ends of the transmitter is connected to the other coil terminal of the transmitting coil, and the other is connected to the other of the pair of rails. Since the transmitter is connected to the track, only one transmitter coil is needed to supply the signal wave from the transmitter to the track. Therefore, the structure of the transmitter is simplified, the number of parts is reduced, the cost is reduced, and maintenance and inspection work on the line becomes easier.

<Example> FIG. 1 is a non-insulated track circuit diagram according to the present invention. In the figure, the same reference numerals as in FIG. 3 indicate the same components.

In FIG. 1, R ₁ and R ₂ are rails forming a railway track, L is a transmitting coil, C ₁ is a capacitor connected in series with the transmitting coil L, T ₁ is a transmitting transformer, and 2 is a transmitter. The transmitting coil L is connected between the rails R 1 and R ₂ while aligning the opposing coil sides to the rails R ₁ and R ₂ between the two points c and d on the train advance end side of _the block boundary of the track circuit. It is wound with an appropriate number of turns. One coil terminal of the transmitting coil L is electrically connected to the rail _R1 at point c, and
The other coil terminal is conductively connected to one end of the coil T ₁₂ of the transmission transformer T ₁ via the capacitor C ₁ . The other end of the transmission transformer T ₁₂ is electrically connected to the rail R ₂ .

Figure 2 is a diagram showing _{the specific structure of the part where the transmitting coil L is attached to the rails R 1 and} R _{2 .}
A transmitting coil L made of a cable or the like having a plurality of core wires is installed close to the transmitting coil L, and a magnetic shield plate S is provided to magnetically shield the transmitting coil L and confine leakage magnetic flux. Magnetic shield plate S has not only magnetic properties but also vibration and shock resistance,
Weather resistance is also taken into consideration when making a decision. For example, iron plates, silicon steel plates, amorphous metals, etc. are suitable.

The signal wave transmitted from the transmitter 2 is transmitted from the coil T ₁₁ to the coil T ₁₂ of the transmission transformer T ₁ .
Then, on the coil T ₁₂ side, signal waves IS ₁ and IS ₂ are supplied from the transmitting coil L to the rails R ₁ and R ₂ .
Here, the transmitting coil L has both coil sides R ₁ ,
Since a spiral coil is formed between both rails R ₁ and R ₂ along R ₂ , the transmitting coil L is connected to the rail.
It can be deeply magnetically coupled to R ₁ and R ₂ ,
The signal waves IS ₁ , IS ₂ are supplied to the rails R ₁ , R ₂ with little loss, and the signal waves IS 1 , IS ₂ are efficiently delivered to the receiving section of the track circuit.
IS ₂ can be sent.

Moreover, one coil terminal is connected to rail _R1 ,
Since the other end is connected to the transmitter 2 side, only one transmitting coil L is required. Therefore, the structure of the transmitter is simplified, the number of parts is reduced, the cost is reduced, and maintenance and inspection work on the line becomes easier.

In the embodiment, since leakage magnetic flux is contained by the magnetic shield plate S, the transmitting coil L is connected to the rail.
It can be magnetically coupled more deeply to R ₁ and R ₂ .

Next, the configuration of the receiving section will be explained. The receiving section is installed at a boundary set at a predetermined distance from the boundary where the transmitting section is installed. In this embodiment, the receiving section includes at least three coils L ₁ ,
It has a receiving transformer T ₂ with L ₂ and L ₃ . The coils L ₁ , L ₂ and L ₃ are inductively coupled on a core of an appropriate shape such as a toroidal core or a bar core.

2 on the train approach end side of the blockage boundary on rails R ₁ and R ₂
Points a and b are set apart by an interval _l1 . This distance l ₁ is an interval of about several meters to more than ten meters. At these points a and b, the first coil L ₁ of the receiving transformer T ₂
Connect both ends for electrical continuity. first coil
L ₁ is spaced apart from rail R ₁ by a distance l ₂ . Second
In the same way, the coil L ₂ of is electrically connected to the rail R ₂ with its both ends separated by a distance l ₃ , and
It is placed at a distance l ₄ from the rail R ₂ . As a result, a closed circuit made up of the pair of lead wires connected to the two points of the rails R ₁ and _{R 2} and the rails R 1 and R ₂ has a high inductance.

These first coil L ₁ and second coil L ₂
is the signal current IS ₁ flowing in opposite directions through the rails R ₁ and R ₂ ,
Also, _{the rails R 1 ,}
Connect R ₂ so that it is differentially connected to the train currents IN ₁ and IN ₂ flowing in the same direction. And the third coil
The harmonic output appearing at _L3 is input to the receiver 3.

When the train is outside the blockage boundary point a at the approach end, the receiver 3 mainly uses the signal currents IS ₁ and IS ₂ flowing in both rails R ₁ and R ₂ between points a and b, and the rail inductance. A voltage drop determined by the impedance is received by the receiving transformer _T2 , and the receiver 3 is activated and the relay 4 is raised. In this case, the inductance value due to the part _{l 1 of} the rail R ₁ and the lead wire l ₂ seen from the coil L 1 of the receiving transformer T ₂ is the interval l ₁ , l ₂
Since it is approximately proportional to the area l ₁ × l ₂ due to and is significantly larger than the resistance of the rail R ₁ between points a and b,
A large voltage drop can be obtained in the first coil _L1 . The same applies to the second coil _L2 side. When the axle at the front of the train comes to the middle between points a and b, both rails R ₁ and R ₂ are short-circuited, the signal current on the outside of the axle decreases, and the voltage between points a and b also decreases. Receive input decreases.

When the leading axle of the train further moves inside point b, the signal current is short-circuited and almost disappears, so the input to the receiver 3 decreases and the relay 4 falls. Therefore, the presence or absence of a train is determined approximately halfway between points a and b, and the signal 5 becomes, for example, in an R display.

When the train progresses further and its terminal end is at the blockage boundary point c, the relay 4 remains dropped because the rails R ₁ - _{R 2} are short-circuited by the axle.
When the end of the train advances to the middle between points c and d, the short-circuit current flowing through the transmitting coil L couples with the rail in the rear section of the train and flows to the receiving end. When the end of the train passes through point d, the current flowing through the transmitting coil L increases due to the axle short circuit, and the coupling distance between c and d with rails R ₁ and R ₂ becomes longer, and the current flowing through the transmitting coil L at point c increases. Since the inter-rail voltage is also restored, the signal current at the receiving end increases, the receiver 3 is activated, and the relay 4 is lifted. Then, the display of the signal 5 changes, and the presence or absence of a train can be determined near the tip of the transmitting coil L. In this way, the presence or absence of a train can be determined in an extremely narrow range on both the approach and exit sides of the blockage boundary, achieving extremely high train detection characteristics, eliminating unnecessary stop indications to following trains, and improving the efficiency of train operation. can be done.

<Effects of the invention> As described above, according to the present invention, the following effects can be obtained.

(a) The transmitter coil is deeply magnetically coupled to both rails,
It is possible to provide an uninsulated track circuit that can supply transmission power to the track with little loss and efficiently transmit it to the receiving end of the track circuit over a long distance.

(b) Since the magnetic flux caused by the increased current immediately after the transmitting coil advances is deeply coupled to the rail and a large induced current is sent to the receiving end, the train detection point when the train advances is performed near the outside of the transmitting coil, and the insulated A clear boundary close to the track circuit is obtained.

(c) Since only one transmitting coil is required, the configuration of the transmitting section is simplified, the number of parts is small, the cost is low, and uninsulated track circuits are easy to perform maintenance and inspection work on railway tracks. Can be provided.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an uninsulated track circuit according to the present invention, Fig. 2 is a diagram showing a specific coupling structure between a transmitting coil and a rail constituting the uninsulated track circuit according to the present invention, and Fig. 3 is a circuit diagram of a conventional non-insulated track circuit. R ₁ , R ₂ ... rail, 2 ... transmitter, 3 ... receiver, 4 ... relay, 5 ... traffic light, L ... transmitting coil, T ₁ ... transmitting transformer, T ₂ ... receiving transformer .

Claims (1)

[Claims for Utility Model Registration] (1) An uninsulated track circuit including a pair of rails R ₁ , R ₂ , transmitting sections 2, L, and receiving sections T ₂ , 3, wherein the pair of rails R ₁ and _R2 constitute a railway track and have an uninsulated boundary set apart from each other in the lengthwise direction of the rail, and the transmitting section 2, L has a transmitter 2, a transmitting coil L and The transmitting coil L is a spiral coil disposed near one of the pair of adjacent non-insulated boundaries, and the coil sides are along the pair of rails R ₁ and R ₂ . , one of the coil terminals is connected to one R ₁ of the pair of rails R 1 and R ₂ , and the transmitter 2 has two output terminals, one of which is connected to the coil terminal _of the transmitting coil L. and the other is connected to the other R ₂ of the pair of rails R ₁ , R ₂ , and the input side of the receiver T ₂ , 3 is connected to the other of the pair of adjacent non-insulated boundaries. A non-insulated track circuit connected to the pair of rails R ₁ and R ₂ in the vicinity of the non-insulated boundary of the non-insulated track circuit. (2) The transmitting coil L is at least connected to the rail.
Magnetic shield S on the side of the coil along R ₁ and R ₂
The non-insulated track circuit according to claim 1 of the utility model registration claim. (3) The receiving sections T ₂ , 3 include a receiving transformer T ₂ , and the receiving transformer T ₂ includes at least first to third coils L ₁ to _{L 3} . the first coil L ₁ and the second coil
L ₂ is conductively connected to two points a and b separated from each other with respect to each rail R ₁ or R ₂ , and a pair of rails connected to two points a and b of said rails R ₁ and R ₂ . The conductor and the rails R ₁ and R ₂ are arranged at intervals l ₂ and l ₄ with respect to the rails R ₁ and R ₂ so that the closed circuit has inductance, and The conductor wires are led to two points a and b of the rails _R1 and _R2 with a distance _l1 or _l3 between them, and the third coil _L3 has a waveform of the signal current. Therefore, the first coil L ₁ and the second coil L 1 have a differential winding direction with respect to the train current.
The non-insulated track circuit according to claim 1 or 2, which is inductively coupled to the coil L ₂ of the coil L 2 and outputs a received signal voltage.