JP2004224075A - Short circuit support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a short circuit support device for certainly short-circuiting rails. <P>SOLUTION: Power supply parts 30a and 30b are connected between left ends and between right ends of axles 20a and 20b installed on the front side and rear side of a bogie 10 for a rolling stock running on two rails r1 and r2, respectively. The power supply parts 30a and 30b are synchronously controlled, and voltages are applied between left axle ends and between right axle ends by AC power. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a short circuit support device that supports a short circuit in a track circuit.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a train detection device that uses a track circuit to detect whether or not a train is present has been put into practical use as a security device for train operation. This train detection device is configured such that when a vehicle enters the track circuit, the wheels and axle of the vehicle are short-circuited between the left and right rails, so that the signal transmitted from the sending end of the track circuit is Using the fact that the reception level on the receiving end side is reduced, it is detected that the vehicle is present in the track circuit.
[0003]
Therefore, in order to detect a train in the track circuit by the above-described train detection device, it is necessary to surely short-circuit the left and right rails with wheels and axles. However, for example, depending on the condition of the wheel tread surface and the rail top surface, the weight of the vehicle, and the like, the short circuit state between the left and right rails is insufficient, and the train cannot be detected in some cases.
[0004]
Specifically, for example, an electrical contact resistance (short-circuit resistance) between the wheel tread surface and the rail is increased by an insulating film formed by dust, oil, rust, or the like formed on the rail surface in contact with the wheel. , Short circuit failure occurs.
[0005]
In addition, when the weight of the vehicle is reduced, the contact pressure with the rail is reduced, so that the short-circuit resistance is increased and the coating is hardly broken. In order to improve the problem of such a lightweight vehicle, for example, in a lightweight vehicle such as a maintenance vehicle, an inducing means for inducing an electric current in an axle is provided to break an insulating layer such as rust formed on a rail surface. Therefore, there is known a train detection device that accurately short-circuits between rails (see Patent Document 1).
[0006]
Specifically, a core is provided around an axle, and a coil is wound, and an alternating current is applied to the coil to generate an induced current in the axle, before and after being installed at the front and rear positions of the bogie. By passing a current through a closed loop formed by the axles, the wheels fixed to each axle, and the two rails, the insulating layer formed on the rail surface is destroyed and the rails are short-circuited.
[0007]
[Patent Document 1]
JP 2001-328532 A
[Problems to be solved by the invention]
By the way, in the above-described train detection device, it is necessary to secure an installation space for an inducing means for inducing a current in the axle around the axle. In particular, in a commercial vehicle such as a train or a railcar, an electric motor and a gear case are provided around the axle. It is difficult to secure a space for installing the inducing means around the axle because the driving device, the basic brake device and the like are arranged. Further, since the amount of current actually flowing to the axle is unknown, it is not possible to know whether or not the insulating layer formed on the rail surface has been destroyed. For this reason, there is a problem that the device itself cannot determine whether the rails are short-circuited. Also, from the viewpoint of the track circuit, it was impossible to distinguish between a state where no train is present and a short circuit failure.
[0009]
The present invention has been made in view of the above-described conventional circumstances, and has as its object to provide a short-circuit support device for reliably short-circuiting the left and right rails.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the short-circuit support device according to claim 1 is
An application unit (for example, power supply units 30a and 30b shown in FIG. 1) for applying a predetermined voltage between the left end and the right end of the front and rear axles installed at the front and rear positions of the bogie for a railway vehicle; It is characterized in that the short-circuit resistance between the wheel tread and the rail is reduced by applying a voltage by the application means.
[0011]
According to the invention described in claim 1, by applying a predetermined voltage between the left end or right end of the front and rear axles installed at the front and rear positions of the railcar bogie, the rail surface is applied to the rail surface. The formed insulating film can be destroyed. As a result, short-circuit failure due to short-circuit resistance between the wheel tread and the rail can be improved, and the left and right rails can be more reliably short-circuited by the wheel and the axle.
[0012]
And the short-circuit support device according to claim 2 is
An application unit (for example, power supply units 30a and 30b shown in FIG. 1) for applying a predetermined voltage between the left end and the right end of the front and rear axles installed at the front and rear positions of the bogie for a railway vehicle; It is characterized in that the short-circuit resistance between the wheel tread and the rail is reduced by applying a voltage by the application means.
[0013]
According to the second aspect of the present invention, by applying a predetermined voltage between the left end portions of the front and rear axles installed at the front and rear positions of the bogie for a railway vehicle, the left end portions of the front and rear axles are provided. While breaking the insulating film formed on the rail surface with which the wheels contact, the wheels at the right ends of the front and rear axles come into contact by applying a predetermined voltage between the right ends of the front and rear axles. The insulating film formed on the rail surface can be destroyed. This makes it possible to more reliably prevent short-circuit failure due to short-circuit resistance between the wheel tread and the rail, and to reliably short-circuit the left and right rails with the wheel and the axle.
[0014]
According to a third aspect of the present invention, in the short-circuit support device according to the first or second aspect,
The axle is supported by the bogie for a railway vehicle via an axle box,
The axle box includes an insulating member for electrically insulating the axle from the bogie for a railway vehicle.
[0015]
According to the third aspect of the present invention, the axle supported by the railcar bogie via the axle box and the railcar bogie can be electrically insulated by the insulating member of the axle box. Therefore, it is possible to prevent the current from flowing from the axle to the side of the bogie for the railway vehicle, so that the current applied by the applying means can be reliably flowed between the wheel tread and the rail. As a result, the insulating coating formed on the rail surface can be more reliably destroyed, and the short-circuit resistance between the wheel tread surface and the rail can be reduced.
[0016]
According to a fourth aspect of the present invention, in the short-circuit support device according to any one of the first to third aspects,
The railcar bogie supports the axle box via an axle box support device,
The axle box and the axle box support device are electrically insulated from each other.
[0017]
According to the fourth aspect of the present invention, by electrically insulating the axle box and the axle box support device from each other, the bogie for a railway vehicle connected to the axle box from the axle via the axle box support device. Since the inflow / shunt of the current to the side can be prevented, the current applied by the applying means can be reliably flowed between the wheel tread and the rail. As a result, the insulating coating formed on the rail surface can be more reliably destroyed, and the short-circuit resistance between the wheel tread surface and the rail can be reduced.
[0018]
According to a fifth aspect of the present invention, in the short-circuit support device according to any one of the first to third aspects,
The railcar bogie supports the axle box via an axle box support device,
The railcar bogie and the axle box support device are electrically insulated from each other.
[0019]
According to the fifth aspect of the present invention, the railcar connected to the axle via the axle box support device from the axle by electrically insulating the bogie for the railroad vehicle from the axle box support device. Since the inflow and shunting of the current to the trolley can be prevented, the current applied by the applying means can be reliably flowed between the wheel tread and the rail. As a result, the insulating coating formed on the rail surface can be more reliably destroyed, and the short-circuit resistance between the wheel tread surface and the rail can be reduced.
[0020]
Furthermore, the invention according to claim 6 is the short-circuit support device according to any one of claims 1 to 3,
The railcar bogie supports the axle box via a laminated rubber.
[0021]
According to the invention of claim 6, since the railcar bogie and the axle box are connected via the laminated rubber, the railcar and the axle box are electrically insulated from each other. Current from the vehicle to the railcar bogie side can be prevented, so that the current applied by the applying means can flow reliably between the wheel tread and the rail. As a result, the insulating coating formed on the rail surface can be more reliably destroyed, and the short-circuit resistance between the wheel tread surface and the rail can be reduced.
[0022]
According to a seventh aspect of the present invention, in the short-circuit support device according to any one of the first to sixth aspects,
Detecting means (for example, current detecting units 40a and 40b shown in FIG. 1) for detecting an amount of current or a voltage value generated by the applying means;
Determining means (for example, a state determining unit 50 shown in FIG. 1) for determining a short-circuit state between the left and right rails based on a detection result by the detecting means;
Is further provided.
[0023]
According to this invention, the amount of current or voltage applied between the left and / or right ends of the front and rear axles installed at the front and rear positions of the railcar bogie is detected. Then, the short-circuit state between the rails can be determined in real time based on the detection result. Therefore, it is possible to improve the safety by monitoring the discrimination result one by one and to use it.In addition, if it is recorded in a recording device provided separately with time information and position information, it is possible to grasp a caution point etc. It can be used and maintainability can be improved.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a short-circuit support device to which the present invention is applied will be described in detail with reference to the drawings.
[0025]
FIG. 1 is an explanatory diagram for explaining the principle of a short-circuit support device to which the present invention has been applied. As shown in the figure, between the left and right ends of axles 20a and 20b installed on the front side (front position) and the rear side (rear position) of the railcar bogie 10 traveling on two rails r1 and r2. Power units 30a and 30b and current detectors 40a and 40b that detect the amount of current supplied by the power units 30a and 30b are connected between the units. The power supply units 30a and 30b are connected to the left and right axle ends via current limiting resistors. The power supply units 30a and 30b are synchronously controlled, and apply a voltage between the left and right axle ends using an AC power supply.
[0026]
FIG. 2 is a diagram illustrating a current path of a current supplied by the power supply units 30a and 30b. As shown in the drawing, a closed loop R1 of a current flowing from the one end of the axle 20b through the rail r1 through the wheel 70b through the power supply unit 30a to the one end of the axle 20a through the wheel 70a is formed. Similarly, a closed loop R2 of a current flowing from the other end of the axle 20a through the rail r2 through the wheel 70c through the power supply unit 30b to the other end of the axle 20b through the wheel 70d is formed.
[0027]
The short-circuit resistance of a train running on rails consists of the contact resistance between wheels and rails, the resistance of the axle itself, etc., but most of it is due to the contact resistance between rails and each wheel. is there. One of the factors is considered to be a film resistance caused by an oxide film formed on the rail surface. The oxide film is close to an insulating state when the voltage is low, but has an electrical characteristic that when a voltage is applied to a certain level or more, the film is broken and a current flows and the resistance is reduced. Another factor may be a film resistance caused by the semiconductor film formed on the rail surface. The semiconductor coating shows a resistance proportional to the flowing current at a low voltage, but has an electrical characteristic that when a voltage higher than a certain level is applied, the contact voltage becomes constant irrespective of the current.
[0028]
Even if an insulating oxide film is formed on the rail surface, the oxide film can be destroyed by forming the closed loops R1 and R2 of a predetermined voltage, and short-circuit failure due to short-circuit resistance between the wheel tread surface and the rail can be prevented. Can prevent and assist in orbital short circuit. Thereby, a short circuit between the left and right rails due to the wheels and the axle in the track circuit can be reliably applied.
[0029]
In addition, the power supply units 30a and 30b are connected to the brush 80 that is installed so as to contact the shaft end surfaces of the axles 20a and 20b with a cable. The axles 20a and 20b are attached to the bogie frame that supports the vehicle body at the shaft ends via an axle box 110 having a bearing 90 and an axle box support device (not shown) having an axle spring 130. In order to form the loops R1 and R2, an insulating bearing 90 is used as the bearing 90, and electrically insulates the wheels 70a and 70b from the bogie frame.
[0030]
Further, as shown in FIG. 1, the current amount detected by each of the current detection units 40a and 40b is output to the state determination unit 50, and the state determination unit 50 determines the distance between the left and right rails based on the input current amount. Determine the short circuit condition. Further, a result of the determination by the state determination unit 50 is output to, for example, an output unit 60 disposed in a crew cabin or the like, and a short-circuit state between the left and right rails is reported to the vehicle.
[0031]
FIG. 3 shows a side view of the railway vehicle bogie 10 with the shaft end exposed. The axle is supported at both ends by an axle box 110 containing a bearing 90. The power supply unit 30 is cable-connected to the brush 80 that comes into contact with the end surface of the axle.
[0032]
Between the axle box 110 and the bogie frame 120, an axle spring 130 constituting the axle box support device is installed. The axle box 110 is provided via an insulating spring seat (not shown) made of rubber or the like. And is connected to the shaft spring 130. With this insulating spring seat, electrical insulation between the axle box 110 and the axle spring 130, and thus between the axle and the bogie frame 120, is further maintained.
[0033]
In order to further increase the electrical insulation between the axle 20 and the bogie frame 120, the bush used for the shaft beam 140 may be a bush containing rubber.
[0034]
Further, there is a type of axle box supporting device that supports an axle box, in which a function of an axle spring is performed by utilizing characteristics of rubber. FIG. 4 is an enlarged view around the axle provided with the rubber type axle box support device. In the figure, an axle box 210 is supported by a bogie frame 230 via a laminated rubber 220 that supports the axle box 210 so as to sandwich the axle box 210. Therefore, the axle box 210 and the bogie frame 230 are electrically insulated by the laminated rubber 220.
[0035]
Next, a functional configuration of the short-circuit support device 1 will be described. FIG. 5 is a diagram illustrating an example of a functional block diagram of the short-circuit support device 1. The short-circuit support device 1 includes a power supply unit 30a connected between the left ends of the front and rear axles of the railcar bogie 10, a power supply unit 30b connected between the right ends of the front and rear axles, a power supply unit 30a, It comprises current detecting units 40a and 40b for detecting the amount of current supplied by 30b, a state determining unit 50, and an output unit 60.
[0036]
The power supply units 30a and 30b are inverter circuits that convert power supplied from an overhead wire or storage battery power via a pantograph to AC power and output the AC power.
[0037]
The state determination unit 50 includes a microcomputer, a ROM, a RAM, a filter, a comparator, and the like, and detects a current amount detected by the current detection units 40a and 40b based on detection signals input from the current detection units 40a and 40b. Is determined to be equal to or greater than a predetermined threshold, thereby determining a short circuit state.
[0038]
Specifically, a predetermined AC voltage is applied between the left ends of the axle and between the right ends thereof by the power supply units 30a and 30b. At this time, when the voltage is low, the amount of current is close to zero because the oxide film on the rail surface cannot be broken, but when the voltage is high, the oxide film is broken and the amount of current increases rapidly. Therefore, when the current detectors 40a and 40b detect a current amount equal to or greater than the predetermined threshold, the state determination unit 50 determines that the oxide film has been destroyed and the left and right rails are in a short-circuit state (hereinafter, this state will be referred to as a short-circuit state). The state is referred to as “normal”.)
[0039]
On the other hand, if it is less than the predetermined threshold, it is determined that a short circuit has not occurred (hereinafter, this state is referred to as “abnormal”). Then, the state determination unit 50 outputs a determination result of whether the short-circuit state is normal or abnormal to the output unit 60.
[0040]
The output unit 60 is provided in a crew cabin or the like, and is configured to include at least one of a light emitting device such as an LED, a display device such as an LCD or a TFT, and a sound output device such as a speaker. The short-circuit state determined by the unit 50 is output.
[0041]
Specifically, for example, when the output unit 60 is a light emitting device, the light emitting device is turned on when a signal indicating that the short-circuit state is abnormal is input from the state determination unit 50, and when the signal is normal, Do not light. When the output unit 60 is a display device or an audio output device, an error message is output when a signal indicating that the short-circuit state is abnormal is input from the state determination unit 50. According to these, the short-circuit failure can be confirmed in real time on the vehicle side, so that safety is improved. Further, if the information is recorded together with the time information, the position information, and the like in a separately provided recording device or the like, the information can be used for grasping a cautionary point, and the maintainability can be improved.
[0042]
Furthermore, even when the axles before and after the railcar bogie 10 straddle the track circuit, the continuity of the function of breaking the coating on the rail surface realized by the short-circuit support device 1 to which the present invention is applied is ensured. be able to. FIG. 6 is a circuit diagram when the front and rear axles straddle the track circuit, and the dashed line indicates the equivalent circuit of the impedance bond. As shown in the figure, a closed loop R10 is formed by the voltage applied to the power supply 30a, and a closed loop R12 is formed by the voltage applied to the power supply 30b.
[0043]
_Also, V a, the following equation for _{V b} (1) and (2) holds.
_{V a = V amax · sin (} ω a · t + θ a) ··· (1)
V _b = V _bmax · sin (ω _b · t + θ _b ) (2)
In this case, if the amplitude _V amax _{= V bmax,} frequency _{ω a = 2πf a = ω b} = 2πf b, the phase difference θ _a = θ _b holds, i.e. if _{V a} = _{V b, i} a and _{i b} Since the magnetic fluxes cancel each other on the impedance bond provided at the boundary of the track circuit, they do not adversely affect the track circuit.
[0044]
As described above, according to the present embodiment, by applying a predetermined voltage between the left and right ends of the front and rear axles installed at the front and rear positions of the bogie for a railway vehicle, The oxide film formed on the rail surface with which the wheel contacts can be destroyed, and short-circuit failure due to short-circuit resistance between the wheel tread surface and the rail can be prevented. Furthermore, by electrically insulating the axle supported by the railcar bogie through the axle box and the railcar bogie, the inflow and shunting of current from the axle to the railcar bogie side is prevented, The current applied by the parts 30a and 30b can be reliably flowed between the wheel tread and the rail. Therefore, the rails can be reliably short-circuited by the wheels and the axle.
[0045]
In the above-described embodiment, the case where the current amount is detected by the current detection unit has been described. However, whether the short-circuit state is normal or not may be detected based on the amount of voltage drop in an element in the circuit. .
[0046]
Further, in the above-described embodiment, a case has been described in which a power supply unit that supplies a current to the closed loops R1 and R2 is provided. However, a circuit (closed loop) is formed by one power supply unit in parallel, and the closed loops R1 and R2 are formed. May be supplied with current.
[0047]
Further, in the above-described embodiment, the case where the voltage is applied between the left ends and the right ends of the axles 20a, 20b installed at the front and rear positions of the bogie 10 for a railway vehicle, respectively, has been described. The voltage may be applied between the left end or the right end of the axle.
[0048]
FIG. 7 shows a current path of a current supplied by the power supply unit 30c. As shown in the figure, a closed loop R3 of a current flowing from the one end of the axle 20b through the rail r2 through the wheel 70d through the power supply unit 30c to the one end of the axle 20a through the wheel 70c is formed. A closed loop R4 passes through the rail r2 through the wheel 70b, passes through the wheel 70b, and passes through the axle 20a through the wheel 70a.
[0049]
Further, in the above-described embodiment, a case has been described where the determination result by the state determination unit 50 is output only to the output unit 60. However, when the state determination unit 50 determines that the short-circuit state is abnormal, the power supply unit 30a, A control signal may be output to 30b to increase the output voltage of the power supply units 30a and 30b.
[0050]
Further, the position of the vehicle when the short-circuit state is determined to be abnormal by the state determination unit 50 may be held. Specifically, the on-board device provided in the vehicle updates and holds the travel distance from the reference position of the running route and the date information (time information) of the day at any time using a known method. When the state determination unit 50 determines that the short-circuit state is abnormal, the state determination unit 50 obtains the moving distance from the reference position at that time from the on-board device, calculates the current position of the vehicle, and obtains date information. Then, abnormal information in which the current position of the vehicle and the date information are associated with each other is created, and is recorded in, for example, a recording device provided in the on-board device.
[0051]
According to this, when the oxide film formed on the rail surface cannot be destroyed, the output voltage of the power supply units 30a and 30b can be boosted. It can be reliably destroyed. Therefore, the rails can be reliably short-circuited by the wheels and the axle.
[0052]
【The invention's effect】
As described above, according to the present invention, by applying a predetermined voltage between the left end or the right end of the front and rear axles installed at the front and rear positions of the bogie for a railway vehicle, the rail surface is applied to the rail surface. The formed insulating film can be destroyed. As a result, short-circuit failure due to short-circuit resistance between the wheel tread and the rail can be prevented, and the right and left rails can be reliably short-circuited by the wheel and the axle.
[0053]
And, by applying a predetermined voltage between the left end of the front and rear axles installed at the front and rear positions of the railcar bogie, the left end of the front and rear axles are formed on the rail surface where the wheels contact. The insulating coating formed on the rail surface where the wheels at the right ends of the front and rear axles come into contact with each other by applying a predetermined voltage between the right ends of the front and rear axles while destroying the insulating coating. Can be destroyed. This makes it possible to more reliably prevent short-circuit failure due to short-circuit resistance between the wheel tread and the rail, and to reliably short-circuit the left and right rails with the wheel and the axle.
[0054]
In addition, the axle supported by the railcar bogie via the axle box and the railcar bogie can be electrically insulated by the insulating member of the axle box. Therefore, it is possible to prevent the current from flowing from the axle to the side of the bogie for the railway vehicle, so that the current applied by the applying means can be reliably flowed between the wheel tread and the rail. As a result, the insulating coating formed on the rail surface can be more reliably destroyed, and the short-circuit resistance between the wheel tread surface and the rail can be reduced.
[0055]
Also, by electrically insulating between the axle box and the axle box support device, it is possible to prevent the inflow and shunt of current from the axle to the railcar bogie connected to the axle box via the axle box support device. Therefore, the current applied by the application unit can be reliably flowed between the wheel tread and the rail. As a result, it is possible to more reliably destroy the insulating coating formed on the rail surface and reduce the short-circuit resistance between the wheel tread surface and the rail.
[0056]
Also, by electrically insulating the railcar bogie from the axle box support device, the inflow and shunting of current from the axle to the railcar bogie side connected to the axle box via the axle box support device. Therefore, the current applied by the application unit can be reliably flowed between the wheel tread and the rail. As a result, the insulating coating formed on the rail surface can be more reliably destroyed, and the short-circuit resistance between the wheel tread surface and the rail can be reduced.
[0057]
Furthermore, since the railcar bogie and the axle box are connected via the laminated rubber, the railcar and the axle box are electrically insulated, so that the current from the axle to the railcar bogie side is reduced. Since the inflow / shunt can be prevented, the current applied by the application unit can be reliably flowed between the wheel tread and the rail. As a result, it is possible to more reliably destroy the insulating coating formed on the rail surface and reduce the short-circuit resistance between the wheel tread surface and the rail.
[0058]
Then, the amount of current or voltage applied between the left end and / or the right end of the front and rear axles installed at the front and rear positions of the railcar bogie is detected, and between the rails based on the detection result. The short-circuit state can be determined in real time. Therefore, it is possible to improve the security by sequentially using the determination result, and if it is stored in a recording device provided separately along with time information and position information, it can be used for grasping a cautionary point and maintenance. It is also possible to improve the performance.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining the principle of a short-circuit support device to which the present invention has been applied.
FIG. 2 is a diagram illustrating a current path of a current supplied by a power supply unit.
FIG. 3 is a side view of a bogie for a railway vehicle with a shaft end exposed.
FIG. 4 is an enlarged view around an axle provided with a rubber type axle box support device.
FIG. 5 is a functional block diagram of the short-circuit support device.
FIG. 6 is a diagram showing a circuit diagram when front and rear axles straddle a track circuit.
FIG. 7 is a diagram showing a modification of the current path of the current supplied by the power supply unit.
[Explanation of symbols]
r1, r2 rail 1 short-circuit support device 30 (30a, 30b) power supply unit 40 (40a, 40b) current detection unit 50 state determination unit 60 output unit 10 bogie for railway vehicle 20 (20a, 20b) axle 70 (70a, 70b) Wheel

Claims (7)

An application means for applying a predetermined voltage between the left end or the right end of the front and rear axles installed at the front and rear positions of the bogie for the railway vehicle is provided, and a voltage is applied between the wheel tread and the rail by applying the voltage by the application means. A short-circuit support device characterized by reducing short-circuit resistance. An application means for applying a predetermined voltage between the left end and the right end of the front and rear axles installed at the front and rear positions of the railcar bogie, between the wheel tread and the rail by applying the voltage by this application means A short-circuit support device characterized by reducing short-circuit resistance. The axle is supported by the bogie for a railway vehicle via an axle box,
3. The short-circuit support device according to claim 1, wherein the axle box includes an insulating member for electrically insulating the axle from the bogie for a railway vehicle. 4. The railcar bogie supports the axle box via an axle box support device,
The short-circuit support device according to any one of claims 1 to 3, wherein the shaft box and the shaft box supporting device are electrically insulated from each other. The railcar bogie supports the axle box via an axle box support device,
The short-circuit support device according to any one of claims 1 to 3, wherein the railcar bogie and the axle box support device are electrically insulated from each other. The short-circuit support device according to any one of claims 1 to 3, wherein the railcar bogie supports the axle box via a laminated rubber. Detecting means for detecting a current amount or a voltage value generated by the applying means,
Determining means for determining a short-circuit state between the left and right rails based on a detection result by the detecting means;
The short-circuit support device according to any one of claims 1 to 6, further comprising:

Images