JP6974790B2 - Road-rail vehicle - Google Patents

Description

The present invention relates to a road-rail vehicle including wheels and iron wheels.

Conventionally, there has been known a "road-rail vehicle" configured to travel using wheels for traveling on the road when traveling on the road and to travel using iron wheels for traveling on the track when traveling on the track. A work device such as an aerial work platform or a crane work device is mounted on the upper part of this road-rail vehicle and is used for track maintenance work of railways and the like.

Some road-rail vehicles are equipped with a swing mechanism that swings a swing frame that supports left and right iron wheels behind the vehicle (or in front of the vehicle) around a swing axis that extends in the front-rear direction of the vehicle. By providing this rocking mechanism, the four iron wheels follow the height difference between the front, rear, left and right on the track (rail), so that the road-rail vehicle can run stably on the track.

The road-rail vehicle provided with the swing mechanism is supported by, for example, three points of the left and right iron wheels in front of the vehicle and the swing shaft of the swing mechanism in the rear of the vehicle. Therefore, the stability (referred to as "on-rail performance") when working in a state of being stopped on the track is inferior to the case where it is supported by four points of front, rear, left and right iron wheels. For example, when a high-place work device is mounted as a work device, the working radius is narrower in the case of three-point support than in the case of four-point support. In addition, in order to improve on-rail performance, outriggers may be provided on the vehicle body, but if outriggers are used, work efficiency will be greatly reduced.

Therefore, for example, in the road-rail vehicle described in Patent Document 1, a swing lock means for locking the swing frame so as not to swing is provided, and the swing lock means locks the swing during the on-rail work, thereby performing the on-rail work. It is possible to expand the workable range at the time. More specifically, the road-rail vehicle of Patent Document 1 is free to swing if the conditions such as turning on the traveling power, operating the turntable, extending / retracting the iron wheel, and operating the outrigger are satisfied. It is controlled.

Japanese Unexamined Patent Publication No. 2012-187985

By the way, in the conventional road-rail vehicle of Patent Document 1, when the turntable is operated, the internal pressure of the rocking lock device (cylinder) may increase, resulting in an opening failure. That is, when the turntable retracting operation is stopped almost at the same time as the rail contact at the time of loading, the swing lock cylinder automatically expands. However, on a rail with a cant, the vehicle rotates around the turntable at the moment when the front iron wheel touches the ground, and the rear iron wheel slides laterally with respect to the rail. Then, a force acts in the vertical direction due to the curved surface of the rail and the taper of the iron ring, the pressure (confinement pressure) in the swing lock cylinder increases, and the pilot check valve may not be opened by the pilot pressure.

Therefore, an object of the present invention is to provide a road-rail vehicle in which a closing pressure is not generated in the swing lock device (cylinder) even if the turntable retracting operation is stopped substantially at the same time as the rail contact.

In order to achieve the above object, the track vehicle of the present invention has a pair of left and right road traveling wheels arranged in front of and behind the vehicle, and a pair of left and right track traveling arranged in front of and behind the vehicle. A swing frame that rotatably supports a pair of left and right iron wheels, either in front of or behind the vehicle, and is capable of swinging around a swing axis extending in the vehicle front-rear direction of the vehicle body frame. A swing lock device that is bridged between the swing frame and the vehicle body frame and the swing frame so that the swing frame cannot swing with respect to the vehicle body frame, and mounted on the vehicle body frame. When it is determined that the work device that performs a predetermined work and the work device are in use, the swing lock device is activated to control the swing frame so that it cannot swing with respect to the vehicle body frame. A power switch for switching ON / OFF of a power source for traveling on a track using the iron wheel, a work table supported by a boom as the work device, and a work table arranged in the work table. Further including a foot pedal for switching ON / OFF of the boom operation, the control device is used by the working device when the power switch is turned off and the foot pedal is turned on. It is designed to be judged to be in a state .

As described above, in the road-rail vehicle of the present invention, the wheel, the iron wheel, the swing frame, the swing lock device, the work device, and the swing lock device are activated when it is determined that the work device is in use. It is provided with a control device that controls the swing frame so that it cannot swing with respect to the vehicle body frame. With such a configuration, even if the turntable retracting operation is stopped substantially at the same time as the rail contact, the road-rail vehicle does not generate a closing pressure in the rocking lock device (cylinder).

It is a side view of a road-rail vehicle. It is a front view of the iron wheel behind the vehicle. It is a hydraulic circuit diagram of a swing lock device. It is a block diagram of a control system. It is a flowchart of Example 1. It is a flowchart of Example 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, the aerial work platform having a work table will be described as the road-rail vehicle, but the present invention is not limited to this, and the road-rail vehicle equipped with a work device such as a mobile crane having a crane device is not limited thereto. If so, the present invention can be applied.

(Overall composition of road-rail vehicle)
First, the overall configuration of the road-rail vehicle 1 of the present invention will be described with reference to FIG. The road-rail vehicle 1 is composed of a vehicle unit 4 configured based on a general truck vehicle, and an aerial work platform 5 as a work device mounted on the upper part of the vehicle unit 4.

The vehicle unit 4 includes a driver's cab 12, a vehicle body frame 13, and an engine 14. The engine 14 not only drives the wheels 2, ..., But also drives a hydraulic pump (not shown, which will be described later) via a PTO (not shown). In the driver's cab 12, a power switch 83 (see FIG. 4) for switching ON / OFF of a power source for traveling on a track using iron wheels 3, ... Is arranged.

A subframe 15 is installed on the upper part of the vehicle body frame 13. The subframe 15 includes front side outriggers 16 and rear side outriggers 17, and a turntable 18 arranged in a central portion, in addition to the iron ring extension / storage mechanisms 10 and 11 and the swing mechanism 6, which will be described later. .. Then, four wheels (tires) 2, ... Used when traveling on the road are attached to the vehicle body frame 13, and four iron wheels 3, ... Used when traveling on the track are attached to the subframe 15. It is attached.

Specifically, of the four iron wheels 3, ..., the pair of left and right iron wheels 3, 3 in front of the vehicle are iron ring extension / storage mechanisms that are configured to be able to extend / retract by expanding and contracting the cylinder. It is attached to the subframe 15 via 10. On the other hand, the pair of left and right iron wheels 3 and 3 at the rear of the vehicle are first swingably attached to the subframe 15 via the swing mechanism 6, and further stretchable and retractable via the iron wheel extension / storage mechanism 11. It is attached. The configurations of the iron ring extension / storage mechanisms 10 and 11 and the swing mechanism 6 will be described in detail later.

Then, in this embodiment, an example in which the aerial work platform 5 is used as the work device is shown. That is, the swivel base 20 is mounted on the rear portion of the subframe 15 so as to be swivelable, and the telescopic boom 21 is supported on the swivel base 20 so as to be undulating. The telescopic boom 21 is driven to undulate by expanding and contracting the undulating cylinder 22. A workbench 24 is arranged at the tip of the telescopic boom 21 via a leveling means 23. In FIG. 1, the aerial work platform 5 is in a retracted posture in which the telescopic boom 21 is fully reduced and is fully tilted forward.

Further, the swivel table 20 of the road-rail vehicle 1 of the present embodiment is provided with a swivel table operation switch 81 for switching whether or not the operation is possible (ON / OFF) when operating the aerial work platform 5 from the ground. ing. Specifically, when the swivel table operation switch 81 is turned on, the aerial work platform 5 can be operated, and when the swivel table operation switch 81 is turned off, the aerial work platform 5 cannot be operated.

Further, a foot pedal 82 is arranged on the floor of the work table 24 in order to ensure the safety of the operator. When the foot pedal 82 is stepped on, it outputs a regulation release signal of the aerial work platform 5 (a function of a so-called "dead man switch"). That is, the aerial work platform 5 can be operated by the operation lever on the work table 24 only when the foot pedal 82 is stepped on and the regulation release signal is output.

(Structure of iron ring overhang / retract mechanism and rocking mechanism)
Hereinafter, a case where the iron wheels 3 and 3 in the front of the vehicle are not provided with the swing mechanism and the iron wheels 3 and 3 in the rear of the vehicle are provided with the swing mechanism 6 will be described, but the present invention is not limited to this, and the front of the vehicle is not limited to this. The present invention can also be applied when the iron wheels 3 and 3 of the above are provided with a swing mechanism.

As shown in FIG. 1, the iron wheels 3 and 3 in front of the vehicle are attached to the vehicle body frame 13 via an iron ring extension / storage mechanism 10 that is configured to be able to extend / retract by expanding and contracting the cylinder. Specifically, the iron ring extension / storage mechanism 10 on the front side of the vehicle rotates to the left and right bracket portions 10a and 10a fixed to the front position of the subframe 15 and the left and right bracket portions 10a and 10a, respectively. The left and right arm portions 10b and 10b that are freely supported, the left and right iron wheels 3 and 3 that are rotatably supported by the left and right arm portions 10b and 10b, and the iron wheels that are bridged between the bracket portion 10a and the arm portion 10b. It is composed of an overhang / storage cylinder 10c.

Then, by expanding and contracting the iron wheel overhanging / retracting cylinder 10c, the track traveling posture in which the iron wheels 3 and 3 are extended and positioned below the wheels 2 and 2 and the track traveling posture in which the iron wheels 3 and 3 are retracted and the wheels 2 and 2 are retracted. It can be transformed into a road driving posture that is positioned above. Note that FIG. 1 shows the state of the iron ring 3 when it is extended, and the state when it is stored is shown by a two-dot chain line.

On the other hand, as shown in FIG. 2, the iron wheels 3 and 3 at the rear of the vehicle are swingable via the swing mechanism 6, and are further extended and retractably attached via the iron ring extension / storage mechanism 11. Has been done. That is, unlike the iron wheels 3 and 3 in front of the vehicle, the iron wheels 3 and 3 at the rear of the vehicle swing around the swing shaft 61 extending in the front-rear direction of the vehicle by being attached to the subframe 15 via the swing mechanism 6. It is possible (rotatable), and all four wheels are in contact with the rail even on a track with a cant.

The swing mechanism 6 is composed of a swing shaft 61 extending in the front-rear direction of the vehicle and a swing frame 60 capable of swinging with the swing shaft 61 as a rotation axis. The swing shaft 61 is supported by a bearing portion protruding downward from the subframe 15. The swing frame 60 is rotatably (swingable) attached to the subframe 15 via the swing shaft 61. An iron ring overhanging / retracting mechanism 11 is attached to each of the left and right ends of the swing frame 60.

The iron ring extension / storage mechanism 11 on the rear side of the vehicle has the left and right bracket portions 11a and 11a fixed to the swing frame 60 and the left and right bracket portions 11a, similarly to the iron ring extension / storage mechanism 10 on the front side of the vehicle. The left and right arm portions 11b and 11b rotatably supported by the left and right arm portions 11b and 11a, the left and right iron wheels 3 and 3 rotatably supported by the left and right arm portions 11b and 11b, and the bracket portion 11a and the arm portion 11b. It is composed of an iron ring overhanging / retracting cylinder 11c that is bridged over the above.

Then, the swing mechanism 6 of the present embodiment makes the swing frame 60 unable to swing with respect to the vehicle body frame 13 (and the subframe 15) between the upper surface of the swing frame 60 and the lower surface of the subframe 15. A swing lock device 7 is further provided. Specifically, the swing lock device 7 includes a swing lock cylinder 71, a spring 72, and a protruding portion 73. The swing lock cylinder 71 is operated through a hydraulic circuit 90, which will be described later.

More specifically, the upper end of the rocking lock cylinder 71 is fixed to the lower surface of the subframe 15. A plate is attached to the lower end of the rod of the swing lock cylinder 71. On the other hand, a protrusion 73 is provided on the upper surface of the swing frame 60 so that the lower surface of the plate comes into contact with the swing lock cylinder 71 when the swing lock cylinder 71 is extended. A spring 72 that is higher than the height of the protrusion 73 is further installed between the swing frame 60 and the plate.

Therefore, when the swing lock cylinder 71 of the swing lock device 7 is extended, the lower surface of the plate comes into contact with the protrusion 73, so that the swing of the swing frame 60 is locked. The spring 72 functions as a damper between the lower surface of the plate and the upper surface of the swing frame 60 when the swing frame 60 swings in a state where the swing is not locked.

(Composition of hydraulic circuit)
As shown in FIG. 3, the hydraulic circuit 90 for the swing frame mainly includes a hydraulic pump 91, a hydraulic solenoid valve 92, pilot check valves 95L and 95R, and swing lock cylinders 71L and 71R. There is.

The hydraulic pump 91 is rotationally driven by the engine 14 via a PTO (not shown).

The pump port (P) of the hydraulic solenoid valve 92 is connected to the discharge oil passage of the hydraulic pump 91. Further, the tank port (T) of the hydraulic solenoid valve 92 is connected to the oil discharge passage to the tank 99. Further, the port (B) of the hydraulic solenoid valve 92 is connected to the first oil passage 93 connected to the swing lock cylinder 71. The first oil passage 93 branches into a first oil passage 93L on the left side and a first oil passage 93R on the right side, and is connected to the left and right swing lock cylinders 71L and 71R via pilot check valves 95L and 95R, respectively. Has been done.

Further, the port (A) of the hydraulic solenoid valve 92 is connected to a second oil passage 94 that supplies pilot pressure to the pilot check valves 95L and 95R. The second oil passage 94 is branched into a second oil passage 94L on the left side and a second oil passage 94R on the right side, and is connected to a port for supplying pilot pressure to the pilot check valves 95L and 95R, respectively.

The pilot check valves 95L and 95R receive the supply of the hydraulic oil and shut off / allow the outflow (backflow) of the hydraulic oil from the head side of the rocking lock cylinders 71L and 71R to the first oil passages 93L and 93R. It has become. Therefore, as described above, the pilot check valves 95L and 95R cannot allow the hydraulic oil to flow out because they are pressed by the closing pressure when the closing pressure is generated in the swing lock cylinders 71L and 71R.

The hydraulic solenoid valve 92 is a solenoid valve having 4 ports and 3 positions, and by energizing the first solenoid 92a, the pump ports (P) and (B) ports are connected to connect the discharge oil passage and the first oil passage 93. In addition to communicating, the tank port (T) and the (A) port are connected to communicate the second oil passage 94 and the exhaust oil passage. Then, the swing lock cylinder 71 extends. On the other hand, by energizing the second solenoid 92b, the pump ports (P) and (A) ports are connected to communicate the discharge oil passage and the second oil passage 94, and the tank ports (T) and (B) ports are connected. Is connected so that the first oil passage 93 and the discharge oil passage are communicated with each other. Then, the pressure oil is released from the rocking lock cylinder 71, and the rocking lock cylinder 71 becomes free. Further, if neither of the solenoids 92a and 92b is energized, the pump port (P) is closed and the supply of hydraulic oil from the hydraulic pump 91 to the first oil passage 93 and the second oil passage 94 is cut off. ..

(Control system configuration)
Next, the configuration of the control system for controlling the swing lock device 7 will be described with reference to the block diagram shown in FIG. The control system of the swing lock device 7 of this embodiment has a control device 30; a power switch 83, a turning table operation switch 81, and a foot pedal 82 as an input system to the control device 30; an output from the control device 30. The system includes a first solenoid 92a and a second solenoid 92b of the hydraulic solenoid valve 92;

The control device 30 is a general-purpose (micro) computer, and has a determination function unit for determining whether or not the aerial work platform 5 as a work device is in use, and the aerial work platform 5 is in use. If it is determined, it has a lock function unit that activates the swing lock device 7 to make the swing frame 60 unable to swing with respect to the vehicle body frame 13 (and the subframe 15). The functions of the judgment function unit and the lock function unit will be described later.

(First judgment method: power switch OFF + foot pedal ON)
Hereinafter, the flow of control when the first determination method is used will be described with reference to the flowchart of FIG.

First, the determination function unit of the control device 30 determines whether or not a signal indicating that the power has been turned off has been input from the power switch 83 (step S1). Then, if a signal indicating that the power has been turned off is input (YES in step S1), the process proceeds to step S2. If no signal indicating that the power has been turned off is input (NO in step S1), the control is terminated (END). In this case, since the second solenoid 92b is energized in the default state, the swing-free state is maintained.

Next, the determination function unit of the control device 30 determines whether or not a signal indicating that the foot pedal 82 has been depressed and turned ON has been input from the foot pedal 82 (step S2). Then, when a signal indicating that the foot pedal 82 is depressed and turned ON is input (YES in step S2), the process proceeds to step S3. When the signal indicating that the foot pedal 82 has not been depressed and turned ON is not input (NO in step S2), the control is terminated (END). In this case, since the second solenoid 92b is energized in the default state, the swing-free state is maintained.

In this way, the determination function unit of the control device 30 works at a high place as a work device when the power switch 83 for track traveling is turned off and the foot pedal 82 is depressed and turned on. It is determined that the device 5 is in use.

Then, when the lock function unit of the control device 30 is determined to be in use by the determination method as described above, the first solenoid 92a is energized, whereby the oil pressure is increased. The pump ports (P) and (B) ports of the solenoid valve 92 are connected to communicate the discharge oil passage and the first oil passage 93, and the tank ports (T) and (A) ports are connected to connect the second oil passage. Communicate the 94 with the oil discharge channel.

Then, the pressure oil from the hydraulic pump 91 is supplied to the first oil passage 93 from the pump port (P) to the port (B) of the hydraulic solenoid valve 92. Then, the pressure oil supplied to the first oil passage 93 is branched into two, the first oil passage 93L on the left side and the first oil passage 93R on the right side, and the swing lock cylinder passes through the pilot check valves 95L and 95R. It is supplied to the head side of 71L and 71R and is extended. Then, the lower surface of the plate comes into contact with the protrusion 73, so that the swing of the swing frame 60 is locked. Since the pilot pressure is not supplied to the pilot check valves 95L and 95R, no backflow occurs.

(Second judgment method: power switch OFF + swivel table operation switch ON)
Hereinafter, the flow of control when the second determination method is used will be described with reference to the flowchart of FIG.

First, the determination function unit of the control device 30 determines whether or not a signal indicating that the power has been turned off has been input from the power switch 83 (step S11). Then, if a signal indicating that the power has been turned off is input (YES in step S11), the process proceeds to step S12. If no signal indicating that the power has been turned off is input (NO in step S11), the control is terminated (END). In this case, since the second solenoid 92b is energized in the default state, the swing-free state is maintained.

Next, the determination function unit of the control device 30 determines whether or not a signal indicating that the swivel table operation switch 81 has been turned on has been input from the swivel table operation switch 81 (step S12). Then, if a signal indicating that the swivel table operation switch 81 is turned on is input (YES in step S12), the process proceeds to step S13. If a signal indicating that the swivel table operation switch 81 has been turned on is not input (NO in step S12), the control is terminated (END). In this case, since the second solenoid 92b is energized in the default state, the swing-free state is maintained.

In this way, when the power switch 83 for track traveling is turned off and the swivel table operation switch 81 is turned on, the determination function unit of the control device 30 is an aerial work platform as a work device. It is determined that 5 is in use.

Then, when the lock function unit of the control device 30 is determined to be in use by the determination method as described above, the first solenoid 92a is energized, whereby the oil pressure is increased. The pump ports (P) and (B) ports of the solenoid valve 92 are connected to communicate the discharge oil passage and the first oil passage 93, and the tank ports (T) and (A) ports are connected to connect the second oil passage. Communicate the 94 with the oil discharge channel.

Then, the pressure oil from the hydraulic pump 91 is supplied to the first oil passage 93 from the pump port (P) to the port (B) of the hydraulic solenoid valve 92. Then, the pressure oil supplied to the first oil passage 93 is branched into two, the first oil passage 93L on the left side and the first oil passage 93R on the right side, and the swing lock cylinder passes through the pilot check valves 95L and 95R. It is supplied to the head side of 71L and 71R and is extended. Then, the lower surface of the plate comes into contact with the protrusion 73, so that the swing of the swing frame 60 is locked. Since the pilot pressure is not supplied to the pilot check valves 95L and 95R, no backflow occurs.

(effect)
Next, the effects of the road-rail vehicle 1 of this embodiment will be listed and described.

(1) As described above, the road-rail vehicle 1 of the present embodiment is arranged in front of the vehicle and behind the vehicle with a pair of left and right wheels 2 for road traveling arranged in front of the vehicle and behind the vehicle. A swing frame 60 that rotatably supports a pair of left and right iron wheels 3 for traveling on a track, and a pair of left and right iron wheels 3 ... The swing frame 60 is bridged between the swing frame 60, which is capable of swinging around the swing shaft 61 extending in the vehicle front-rear direction of the vehicle 13, and the vehicle body frame 13 and the swing frame 60, and the swing frame 60 is a vehicle body frame. When the swing lock device 7 that makes swing impossible with respect to 13, the aerial work device 5 as a work device mounted on the vehicle body frame 13 and performing a predetermined work, and the aerial work device 5 are in use. When it is determined, the swing lock device 7 is operated, and the control device 30 for controlling the swing frame 60 so as not to swing with respect to the vehicle body frame 13 is provided. According to such a configuration, even if the turntable retracting operation is stopped substantially at the same time as the rail contact, the rocking lock device 7 (swing lock cylinder 71) does not generate a closing pressure.

That is, conventionally, the swing lock state in which the first solenoid 92a is energized is set to the default state, and the control in which the second solenoid 92b is energized to be in the free state is performed only when the free condition is satisfied. There was a risk that confinement pressure would occur when the chassis 18 was used for loading. On the other hand, in the present invention, the swing-free state in which the second solenoid 92b is energized is set to the default state, and the control in which the first solenoid 92a is energized to be in the locked state is performed only when the lock condition is satisfied. It was said.

Then, as a lock condition in this case, rational control of locking the swing during work by configuring the work device (aerial work platform 5) to determine the usage state "actively". Will be able to be carried out. On the contrary, in the "passive" control such as capturing the retracted state of the working device and making it swing-free, the swing is restricted and the swing-free is not achieved in the non-retracted state. Then, if it is unintentionally put into a non-retracted state, the swing will be restricted, and the safety during track traveling may be impaired.

(2) Further, in the power switch 83 for switching ON / OFF of the power supply for track traveling using the iron wheels 3, ..., the work table 24 supported by the boom 21 as a work device, and the work table 24. Further provided with a foot pedal 82 that is arranged to switch the operation of the boom 21 ON / OFF, the control device 30 is high when the power switch 83 is turned off and the foot pedal 82 is turned on. It is determined that the work device 5 is in use. In this way, it is presumed that the vehicle is not traveling in the orbit because the power supply for traveling in the orbit is OFF, and since the foot pedal 82 is ON, it is positive to actually operate the aerial work platform 5. By making a judgment, you can be sure that you are working. Here, by setting that the power supply for track traveling is OFF as one of the conditions, there is no possibility of rocking lock during track traveling.

(3) Further, it is mounted on a power switch 83 for switching ON / OFF of a power source for track traveling using iron wheels 3, ..., a work table 24 supported by a boom 21 as a work device, and a vehicle body frame 13. The control device 30 further includes a swivel table operation switch 81 that is arranged on the swivel table 20 to switch the operation of the boom 21 ON / OFF, and the control device 30 has the power switch 83 turned off and the swivel table operation switch 81. When is turned on, it is determined that the aerial work platform 5 is in use. In this way, it is presumed that the track is not traveling because the power supply for track traveling is OFF, and the swivel table operation switch 81 is ON, so that the aerial work platform 5 is actually operated. By making positive decisions, you can be sure that you are working. Here, by setting that the power supply for track traveling is OFF as one of the conditions, there is no possibility of rocking lock during track traveling.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent that the gist of the present invention is not deviated are made in the present invention. included.

1: Road-rail vehicle;
2: Wheels; 3: Iron wheels;
4: Vehicle part; 5: Aerial work platform (working device);
10, 11: Iron ring overhanging / retracting mechanism;
12: Driver's cab; 13: Body frame; 15: Subframe;
6: Swing mechanism;
60: Swing frame; 61: Swing shaft;
7: Swing lock device;
71: Swing lock cylinder; 72: Spring; 73: Protruding part;
30: Control device;
81: Swing platform operation switch; 82: Foot pedal; 83: Power switch;
90: Hydraulic circuit;
91: Hydraulic pump; 92: Hydraulic solenoid valve; 93: First oil passage; 94: Second oil passage;

Claims (2)

It ’s a road-rail vehicle.
A pair of left and right wheels for road driving placed in front of and behind the vehicle,
A pair of left and right iron wheels for track running placed in front of and behind the vehicle,
A swing frame that rotatably supports the pair of left and right iron wheels on either the front or the rear of the vehicle, and is swingable around a swing axis extending in the vehicle front-rear direction of the vehicle body frame. When,
An oscillating lock device that is bridged between the vehicle body frame and the oscillating frame so that the oscillating frame cannot oscillate with respect to the vehicle body frame.
A work device mounted on the vehicle body frame to perform predetermined work, and
A control device for operating the swing lock device when it is determined that the work device is in use and controlling the swing frame so that it cannot swing with respect to the vehicle body frame is provided.
A power switch that switches ON / OFF of the power supply for track traveling using the iron wheel, a work table supported by the boom as the work device, and ON / OFF of the operation of the boom arranged in the work table. The control device further comprises a foot pedal for switching between, and the control device determines that the working device is in use when the power switch is turned off and the foot pedal is turned on. It is a road- rail vehicle. It ’s a road-rail vehicle.
A pair of left and right wheels for road driving placed in front of and behind the vehicle,
A pair of left and right iron wheels for track running placed in front of and behind the vehicle,
A swing frame that rotatably supports the pair of left and right iron wheels on either the front or the rear of the vehicle, and is swingable around a swing axis extending in the vehicle front-rear direction of the vehicle body frame. When,
An oscillating lock device that is bridged between the vehicle body frame and the oscillating frame so that the oscillating frame cannot oscillate with respect to the vehicle body frame.
A work device mounted on the vehicle body frame to perform predetermined work, and
A control device for operating the swing lock device when it is determined that the work device is in use and controlling the swing frame so that it cannot swing with respect to the vehicle body frame is provided.
A power switch for switching ON / OFF of a power source for traveling on a track using the iron wheel, a work table supported by a boom as the work device, and a swivel table mounted on the vehicle body frame of the boom. The control device further includes a swivel table operation switch for switching operation ON / OFF, and the working device is equipped with the control device when the power switch is turned off and the swivel table operation switch is turned on. A road-rail vehicle that is designed to be judged to be in use.

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