JP4221257B2 - Escape prevention device for railroad work vehicle - Google Patents

Description

  The present invention relates to a track-and-terrain vehicle that can travel on both a road and a track, and is used for maintenance and inspection work of a trolley wire extending along the track.

  Railroad work vehicles are used to carry out work such as construction and inspection of trolley lines and railway equipment installed along railroad rails, and are constructed based on trucks. Iron wheels (orbital travel wheels) mounted at four locations on the front, rear, left and right of the vehicle body to travel on a track (hereinafter referred to as railroad rail) on a vehicle body having wheels (road vehicle wheels) and capable of traveling on the road, and the track There has been known one that is configured to include a turntable that facilitates entry work when entering the vehicle.

  When working on a high-altitude track using the above-mentioned track-and-rail work vehicle, first travel on the road with the boom and workbench retracted and move to the level crossing near the work site. Then, the vehicle is stopped so as to cross the railroad rail, the turntable is extended and operated to lift and support the vehicle body, and in this state, the vehicle body is turned to be parallel to the railroad rail. Then, after extending the iron wheel for running the track, the turntable that supported the vehicle body is stored, the tread of the iron wheel is placed on the rail, and the iron wheel or wheel is driven. As a result, the track-and-rail work vehicle can travel (track travel) on a railroad rail using an iron wheel, and can move to a work site.

  Further, in the above-mentioned track-and-rail work vehicle, the driver temporarily leaves the driver's seat during the work, and a predetermined braking operation (for example, braking) or the like is not performed, and the track-and-rail work vehicle runs away. In order to prevent such a situation, there is one in which a runaway prevention device is attached (see, for example, Patent Document 1). This escape prevention device detects when the driver forgets to apply the brake when he / she temporarily leaves the driver's seat during work, and detects this to generate a voice or alarm to prevent the escape work vehicle from running away It is like that.

JP 10-129473 A

  In the above escape prevention device, a means for detecting whether or not the driver is seated in the driver's seat, that is, a seating sensor is provided in the driver's seat. The instability of detection accuracy in the seating sensor is, for example, misrecognized that the driver is seated even though the driver is away from the driver's seat, and the vehicle escapes without the runaway prevention device working. There is a risk of inviting. On the other hand, there is a possibility that the seat cannot be detected even though the driver is seated in the driver's seat, and the escape prevention device operates and the vehicle body cannot travel on the track. For this reason, the seating sensor is always required to have high reliability and stable detection.

  Conventionally, as a seating sensor, an optical infrared sensor that detects reflected light from an infrared irradiation target that is irradiated substantially horizontally, a temperature infrared sensor that detects heat of a human body, and the like are used. However, in the optical infrared sensor, since the infrared irradiation distance is set in advance, for example, the irradiated infrared beam is absorbed by the irradiation target according to the color of the irradiation target (such as the clothes of the driver) and reflected light. Or the reflected light intensity varies depending on the shape of the irradiation target (driver's body shape, etc.), or irregular reflection on the surface of the irradiation target (driver). As a result, the detection accuracy is unstable, for example, the intensity of reflected light fluctuates. In addition, the temperature detection type infrared sensor has a problem that the detection accuracy largely changes due to a temperature change around the driver's seat. For this reason, in the above-mentioned sensor, in order to ensure detection accuracy and prevent malfunction of the runaway prevention device, it is necessary to frequently adjust the detection circuit and the like, and as a result, there is a problem that the cost of the equipment is increased. .

  The present invention has been made in view of such problems, and can detect the driver's seat on the driver's seat accurately and stably without being affected by the environmental conditions of the driver's seat. It is an object of the present invention to provide a runaway prevention device for an orbital work vehicle that can control the propriety of the brake operation of the track running wheel based on the above.

In order to achieve the above object, a runaway prevention device for a track-and-terrain vehicle according to the present invention includes a road traveling wheel (for example, a tire wheel 3 in the present embodiment) and a track traveling wheel (for example, an iron wheel in the present embodiment). 4), when traveling on the road, the track running wheel is positioned at the retracted position and traveled by the road traveling wheel, and during the track travel, the track traveling wheel is positioned at the overhanging position in contact with the track. Wheel position detecting means for detecting whether or not a track running wheel is located at an overhang position in a runaway prevention device for a track-and-work vehicle that travels by driving a vehicle wheel or a road running wheel (for example, this embodiment) The wheel overhang sensor 51), the wheel braking means for braking the track running wheel (for example, the iron wheel brake 4b in this embodiment), and the wheel braking means are operated to brake the track running wheel. Second braking operation means (for example, the brake pedal 20b in this embodiment) and second detection means for detecting whether or not the second braking operation means is operated (for example, the second brake sensor 54 in this embodiment). ) And a switch for confirmation provided to detect that the driver is in a drivable state by being operated, and whether or not the driver is wearing a seat belt provided on the vehicle body When the seat belt wearing detection means (for example, the seat belt wearing sensor 55 in the present embodiment) and the wheel position detecting means detect that the orbital running wheel is located at the extended position, the second detecting means When it is detected that the second braking operation means is not operated and the driver detects that the driver is wearing the seat belt by the seat belt wearing means, a predetermined time When the upper second detection means does not detect the operation of at least one of the second braking operation means and the confirmation switch, the stop control means that activates the wheel braking means and stops the traveling of the railroad work vehicle (for example, the present embodiment) And a control unit 30) in the example.

In the present invention described above, it is preferable that the stop control unit is configured to include a warning unit (for example, a warning device 57 in the present embodiment) that performs a warning operation when the wheel braking unit is operated.

According to the runaway prevention device for a railroad work vehicle in the present invention, the seating of the driver on the driver's seat can be accurately and stably detected without being affected by the environmental conditions of the driver's seat, and based on the detection result. It is possible to control the propriety of the brake operation of the track traveling wheel. Further, according to the present invention, since the driver's seat is seated by wearing the seat belt, the driver can be encouraged to wear the seat belt during track running, and safety can be improved.

Furthermore, when the driver is seated in the driver's seat and the predetermined operation is not performed in the second braking operation means, it is considered that the driver is falling asleep or suddenly ill, and the track work vehicle is forced Can be stopped to prevent runaway.

In the present invention, the stop control means may be provided with alarm means for performing an alarm operation when the wheel braking means is operated. With such a configuration, the runaway prevention device of the present invention is configured so that the wheel braking means is used when the driver leaves the driver's seat without operating the wheel braking means or when the driver is seated in the driver's seat for a predetermined time or longer. Since the alarm operation is performed when the vehicle is not operated, it is possible to notify the driver of that fact accurately, and it is possible to quickly examine the countermeasures and prevent the track work vehicle from running away.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a railroad work vehicle 1 according to the present invention. This track-and-rail work vehicle 1 includes a truck vehicle having a driving cabin 2a at the front.

  Tire wheels (road driving wheels) 3 are attached to four places on the front, rear, left and right of the vehicle body 2 and can be driven by a tire wheel engine (not shown) so that the vehicle body 2 can travel on the road. It is like that. Further, at four positions on the front and rear, left and right of the vehicle body 2, iron wheels (rail travel wheels) 4 are rotatably attached to iron wheel support members 4 a that are swingably supported by the vehicle body 2.

  The iron ring support member 4a is oscillated by the expansion / contraction operation of the iron cylinder overhanging storage hydraulic cylinder 5. By oscillating the iron ring support member 4a, the iron ring 4 is extended downward or mounted on the vehicle body 2. It can be stored. Further, in each of the front and rear, the pitch between the left and right iron wheels 4 and 4 can be changed in accordance with the width of the rail R (track) for the railway. The track-and-rail work vehicle 1 places the vehicle body 2 on the rail R with the iron wheel 4 extended (hereinafter, this state is referred to as “iron wheel extension position”), and an iron wheel drive motor (hydraulic motor) 4m (see FIG. 1). ), The iron wheel 4 can be driven to travel on the rail R. The iron wheel 4 is provided with an iron wheel brake 4b (see FIG. 1) for braking the rotation of the iron wheel 4.

  A turntable 6 for attaching and moving the track work vehicle 1 to the rail R is attached to the lower center of the vehicle body 2. The turntable 6 can be extended downward or stored upward by the expansion and contraction operation of the turntable extension extending cylinder 7 (hydraulic cylinder). Further, the vehicle body 2 can be turned horizontally with respect to the turntable 6 by manual operation (human power). A vehicle body turning hydraulic motor may be provided so that the vehicle body 2 can turn horizontally with respect to the turntable 6.

  Outrigger jacks 9 that can be expanded in the width direction of the vehicle body 2 and that can be expanded in the vertical direction are provided at four locations on the front, rear, left, and right sides of the vehicle body 2. The vehicle body 2 is lifted and supported by widening and extending and projecting downward.

  On the vehicle body 2, a turntable 10 that can turn freely with respect to the vehicle body 2 is attached and driven by a turn motor (hydraulic motor) (not shown) 11. A base end portion is pivotally connected to the upper part of the swivel base 10, and the undulation movement can be freely performed by the undulation cylinder 12, and the telescopic movement can be telescoped by a built-in expansion / contraction cylinder 13 (not shown). A boom 14 is attached. A vertical post 15 (not shown) is attached to the tip of the boom 14 so as to be swingable up and down. The vertical post 15 is controlled to be always directed vertically upward by the leveling mechanism regardless of the angle of undulation of the boom 14. The vertical post 15 is provided with a work board 16 for operator boarding that can be swiveled horizontally (freely swingable).

  When moving to the work site or not performing work at a high place, the boom 14 turns the swivel base 10 so as to face the rear of the vehicle body 2, and then contracts and falls down to move the boom 14 backward. It is assumed that the work table 16 is positioned at the rear of the vehicle body 2. Further, when working at a high place, the boom 14 can be lifted and extended from this stored state, and the work table 16 can be moved to a desired high place for work.

  The vehicle body 2 is provided with a power take-off mechanism PTO that takes out the output of an engine (not shown), which is a drive source of the tire wheel 3 during vehicle travel, and drives a hydraulic pump (not shown). When the hydraulic pump is driven using the driving force extracted by the power take-off mechanism PTO, the hydraulic oil from the oil tank is discharged by the hydraulic pump, and this hydraulic oil is controlled by a control valve (not shown) to be a hydraulic actuator, That is, an iron wheel overhanging hydraulic cylinder 5 and an iron wheel drive motor 4m related to the iron wheel 4, a wheel stand overhanging storage cylinder 7 related to the turn table 6, a jack cylinder related to the outrigger jack 9, a swing motor 11 related to the swivel base 10, Each operation is controlled by being supplied to the hoisting cylinder 12 and the telescopic cylinder 13 associated with the boom 14.

  The driving cabin 2a is provided with a track travel operation device 20 for performing track travel and braking in the track work vehicle 1 (see FIG. 1). The track running operation device 20 is configured to control the operation of the iron wheel drive motor 4m and the iron wheel brake 4b in accordance with the operation.

  When the track-and-work vehicle 1 travels on the rail R, a traveling operation by the track traveling operation device 20 is performed. When the traveling operation of the track traveling operation device 20 is performed, a traveling signal is transmitted to the control unit 30. The control unit 30 that has received the travel signal transmits a travel signal to a control valve (not shown) provided in the iron wheel drive motor 4m, opens the control valve, and supplies hydraulic oil to the iron wheel drive motor 4m. To drive the wheel 4 to run the track-work vehicle 1.

  On the other hand, when stopping the track-and-rail work vehicle 1 traveling on the rail R in this way, the braking operation of the track traveling operation device 20 is performed. When the braking operation of the track traveling operation device 20 is performed, a braking signal is transmitted to the control unit 30. The control unit 30 that has received the braking signal cuts off the transmission of the travel signal to the iron wheel drive motor 4m, closes the control valve (not shown) provided in the iron wheel drive motor 4m, and moves to the iron wheel drive pressure motor 4m. The hydraulic oil is cut off to prevent the driving force from being transmitted to the iron wheel 4, and a braking signal is transmitted to the iron wheel brake 4 b to operate the iron wheel brake 4 b, thereby stopping the traveling of the track work vehicle 1.

  In the driving cabin 2a, a seat seat (not shown) on which a driver who operates the track traveling operation device 20 is seated and a seat belt 40 for restraining the driver seated on the seat are provided. As shown in FIG. 3, the seat belt 40 includes a latch belt 41 that is attached to the upper side wall of the driving cabin 2 a and is extendable, a buckle plate 42 that is attached to an intermediate portion of the latch belt 41, and a seat seat side. A buckle 43 attached to the vehicle, stretches the latch belt 41 in the direction of arrow A, and inserts the buckle plate 42 into the buckle 43 to restrain the driver seated on the seat of the driving cabin 2a. It is configured to be able to. Although details will be described later, the buckle plate 42 is provided with a seat belt mounting sensor 55 for detecting the mounting of the seat belt 40.

  When the railroad work vehicle 1 having the above-described configuration is used for construction and inspection of railway facilities such as a stretched line and a trolley line on the rail R, first, the tire wheel 3 is driven to close the work site. Drive on the road to the level crossing. During such road traveling, the iron wheel 4 and the turntable 6 are stored in the vehicle body 2.

  When arriving at a railroad crossing near the work site, the railroad work vehicle 1 is stopped so as to cross the rail R, the power take-off mechanism PTO is turned on, the hydraulic pump is operated, and predetermined pressure oil is supplied to and discharged from each hydraulic actuator. Then, the turntable 6 is extended to operate, thereby supporting the vehicle body 2. Next, the vehicle body 2 is turned horizontally with respect to the turntable 6 manually (manually), and the iron wheel 4 is positioned on the rail R (in the extended position). Here, when the pitch of the left and right iron rings 4 and 4 is different from the width of the rail R, the pitch of the left and right iron rings 4 and 4 is fixed in accordance with the width of the rail R. Then, the iron wheel 4 is extended and operated, the turntable 6 is stored in the vehicle body 2, and the iron wheel 4 is placed on the rail R.

  Subsequently, the steel wheel 4 is rotationally driven by the railway drive motor 4m, travels on the rail R, and moves to the work site. When the vehicle arrives at the work site, the vehicle is stopped and the outrigger jacks 9 arranged on the front, rear, left and right sides of the vehicle body 2 are grounded (that is, the vehicle is extended downward until a ground reaction force acts on the outrigger jack 9). 2 is supported stably. Then, the turntable 4 is swung, the boom 5 is raised and lowered, and the worktable 10 is moved to a desired height so that an operator who has boarded the worktable 10 can use an overhead wire or a trolley wire on the rail R. Carry out construction of railway facilities.

  After the work is completed, the outrigger jack 9 is contracted to lower the vehicle body 2 to place the iron wheel 4 on the rail R again, travel on the rail R and move to the level crossing, and store the iron wheel 4 in the vehicle body 2. The vehicle body 2 is supported and turned by the turntable 6. After the turntable 6 is stored, the power take-off mechanism PTO is turned off, the tire wheels 3 are driven, the vehicle travels on the road, and can move to another destination.

  The track-and-work vehicle 1 having the above-described configuration is provided with the escape prevention device 50 according to the present invention. As shown in FIG. 1, the runaway prevention device 50 includes a brake lever 20a, a brake pedal 20b, an iron wheel extension sensor 51, a speed sensor 52, a brake sensor 53, a seat belt mounting sensor 55, and a confirmation switch. 56, an alarm device 57, a control unit 30, an iron wheel drive motor 4m, and an iron wheel brake 4b.

  The brake lever 20a is provided in the track traveling operation device 20, and is operated to hold the iron wheel 4 in a braking state (holding the stopped state of the vehicle body 2) by the iron wheel brake 4b. A signal is output to the first brake sensor 53.

  The brake pedal 20b is provided in the track traveling device 20, and is operated to brake the iron wheel 4 by the iron wheel brake 4b (decelerate the speed of the vehicle body 2 during the track traveling). Is output to the second brake sensor 54. When the brake pedal 20b is operated (depressed), the brake pressure is applied to the iron wheel 4 in accordance with the operation amount (depressed amount).

  The iron ring overhang sensor 51 is for detecting whether or not the iron wheel 4 is located at the overhang position, that is, whether or not the track can be run, and outputs the detected information to the control unit 30.

  The speed sensor 52 detects the traveling speed of the vehicle body 2 during track travel (when the rail wheel R is driven by the rail drive motor 4m and travels the rail R). The traveling speed is detected, and the detected information is output to the control unit 30.

  The first brake sensor 53 is for detecting whether or not the brake lever 20 a is operated (whether or not the vehicle body 2 is stopped), and outputs the detected information to the control unit 30. is doing.

  The second brake sensor 54 is for detecting whether or not the brake pedal 20b is operated (in order to decelerate the speed of the vehicle body 2 while traveling on track), and outputs the detected information to the control unit 30. is doing.

  The seat belt mounting sensor 55 is a limit switch provided in the buckle 43 (see FIG. 3), and whether or not the buckle plate 42 of the seat belt 41 is securely inserted into the buckle 43, that is, the driver is seat belt. The detected information is output to the control unit 30.

  The confirmation switch 56 is a switch provided in the driving cabin 2a for confirming (detecting) that the driver is in a drivable state. When the confirmation switch 56 is operated, an operation signal is output to the control unit 30 to prevent the runaway prevention device 50 from forcibly stopping the track-and-work vehicle 1 (allowing the track to continue running). The runaway prevention device 50 is configured to cancel the state in which the track work vehicle 1 is forcibly stopped.

  The alarm device 57 is for alerting the driver by performing an alarm operation when the iron wheel brake 4b is operated in order to prevent the control unit 30 from running away during a track run. In the present invention, the alarm operation by the alarm device 57 is configured to sound an alarm sound using an alarm buzzer, but is not limited to this. For example, the vehicle may be provided with a monitor or the like that turns on a warning lamp or displays a warning to escape.

  Here, the control content of the control unit 30 is demonstrated with reference to FIG.4 and FIG.5. First, as shown in FIG. 4, it is detected whether or not the iron ring overhang sensor 51 is located at the overhang position (step S1). In step S1, when the iron wheel overhang sensor 51 detects that the iron wheel 4 is located at the overhang position, the speed sensor 52 detects the traveling speed of the track-and-work vehicle 1 during orbital travel (step S2). . On the other hand, when it is detected in step S1 that the iron wheel 4 is not located at the overhang position by the iron wheel overhang sensor 51, the process returns to step S1.

  In step S2, when the traveling speed detected by the speed sensor 52 is less than a predetermined speed (for example, 2 km / h), whether or not the brake lever 20a is operated by the first brake sensor 53 (that is, the vehicle body 2 Whether or not the stop state is maintained is detected (step S3). On the other hand, when the traveling speed detected by the speed sensor 52 is equal to or higher than the predetermined speed in step S2, the process proceeds to step S10 (see FIG. 5).

  In step S3, when it is detected by the first brake sensor 53 that the brake lever 20a is not operated, whether or not the seat belt 41 is worn by the seat belt wearing sensor 55, that is, the driver is seated in the driver's seat. It is detected whether it is doing (step S4). On the other hand, when it is detected in step S3 that the brake lever 20a is operated by the first brake sensor 53, the process returns to step S2.

  If it is detected in step S4 that the seat belt 40 is worn by the seat belt wearing sensor 55, it is considered that the driver is seated in the driver's seat, and the process returns to step S2. On the other hand, when it is detected in step S4 that the driver does not wear the seat belt 40 by the seat belt wearing sensor 55, the stopped state of the vehicle body 2 is maintained even though the driver is away. Therefore, it is considered that there is a risk that the track-and-rail work vehicle 1 may run away, the alarm device 57 is activated (step S5), the transmission of the driving force from the iron wheel drive motor 4m to the iron wheel 4 is interrupted, and the iron wheel brake 4b is activated. Then, the iron wheel 4 is braked (in the flowchart, described as iron wheel brake system operation; the same applies hereinafter), and the traveling of the track-work vehicle 1 is forcibly stopped (step S6). Then, as described above, it is determined whether or not the confirmation switch 56 is operated in a state where the track-and-work vehicle 1 is forcibly stopped to prevent the runaway (step S7).

  If it is determined in step S7 that the confirmation switch 56 has been operated, the forcible stop of the track-and-work vehicle 1 for preventing the runaway is canceled, and the process returns to step S2 to enable track travel again. On the other hand, if the confirmation switch 56 is not operated in step S7, the process returns to step S7 to continue the forced stop state of the railroad work vehicle 1.

  In step S2, when the traveling speed detected by the speed sensor 52 is equal to or higher than the predetermined speed, the process proceeds to step S10 shown in FIG. 5 and whether or not the driver is wearing the seat belt 40 by the seat belt wearing sensor 55. Is detected. In step S10, when it is detected by the seat belt mounting sensor 55 that the driver does not wear the seat belt 40, the driver leaves the seat and the track-and-rail work vehicle 1 escapes despite the track running. The alarm device 57 is actuated (step S11), the transmission of the driving force from the iron wheel drive motor 4m to the iron wheel 4 is cut off, and the iron wheel brake 4b is actuated to brake the iron wheel 4 to perform the track work. The traveling of the vehicle 1 is forcibly stopped (step S12).

  Thus, in order to prevent runaway, it is determined whether or not the confirmation switch 56 is operated in a state where the track work vehicle 1 is forcibly stopped (step S13). If it is determined in step S13 that the confirmation switch 56 has been operated, the forced stop of the track-and-work vehicle 1 performed to prevent the runaway is released, and the process returns to step S2. On the other hand, if the confirmation switch 56 is not operated in step S13, the process returns to step S137 to continue the forced stop state of the railroad work vehicle 1.

  On the other hand, when it is detected in step S10 that the driver is wearing the seat belt 40 by the seat belt wearing sensor 55, the timer 30t provided in the control unit 40 is activated (step S14). Then, it is detected whether or not the brake pedal 20b is operated by the second brake sensor 54 (in order to decelerate the speed of the vehicle body 2 traveling on the track) (step S15).

  In step S15, when it is detected by the second brake sensor 54 that the brake pedal 20b is operated, the process returns to step S14. That is, the operation of the timer 30t is reset. On the other hand, when it is detected in step S15 that the brake pedal 20b is not operated by the second brake sensor 54, it is subsequently determined whether or not the confirmation switch 56 is operated (step S16).

  If it is determined in step S16 that the confirmation switch 56 has been operated, the process returns to step S14. That is, the operation of the timer 30t is reset. On the other hand, when it is determined in step S16 that the confirmation switch 56 has not been operated, it is determined whether or not a predetermined time (for example, 70 seconds) has elapsed since the timer 30t started operating (step S17). .

  In step S17, when it is determined that the predetermined time has elapsed since the timer 30t is activated, the driver is seated in the driver's seat, but neither the brake pedal 20b nor the confirmation operation switch 56 is operated. Considering that there is a possibility that the main track-and-work vehicle 1 may run away due to a drowsy hand, etc., the process proceeds to step S11 described above, and the travel of the main-track and land work vehicle 1 is forcibly stopped. On the other hand, when it is determined in step S17 that the predetermined time has not elapsed since the timer 30t is activated, the driver is seated in the driver's seat and the track-and-rail work vehicle 1 is regarded as operating normally. Returning to step S17, the operation of the timer 30t is continued.

  Thus, the runaway prevention device 20 of the present invention determines whether the driver is seated based on whether or not the seat belt 40 is attached. For this reason, the present invention can use the existing seat belt mounting sensor 53 provided on the seat belt 40 to reduce the cost and accurately stabilize the seating of the driver on the driver seat. Can be detected and the runaway can be prevented well. In addition, since the driver can be encouraged to wear the seat belt, further safety can be ensured when traveling on the track.

  In addition, this invention is not limited to said embodiment, It can improve suitably. For example, whether or not the driver is seated in the driver's seat is determined based on a pressure sensor that detects a load applied to the seat in the driver's seat (not less than a predetermined load), not based on whether or not a seat belt is attached. ) It may be performed depending on whether or not a load is detected.

  The hydraulic pump P is driven by an electric motor supplied from a battery disposed on the vehicle body 2 even when driven by an engine different from the traveling engine disposed on the vehicle body 2. May be driven.

It is a block diagram of the escape prevention apparatus of the track-and-work vehicle concerning this invention. It is a perspective view of an aerial work vehicle equipped with a runaway prevention device according to the present invention. It is a perspective view which shows the structure of the seatbelt mounted in the track-and-rail work vehicle which concerns on this invention. It is a flowchart explaining the control content of the runaway prevention apparatus which concerns on this invention. It is a flowchart explaining the control content of the runaway prevention apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Railroad work vehicle 2 Car body 2a Driving cabin 3 Tire wheel (wheel driving wheel)
4 Iron wheel (Railway wheel)
4m Iron wheel drive motor 4b Iron wheel brake (wheel braking means)
20 Track running operation device 20a Brake lever (first braking operation means)
20b Brake pedal (second braking operation means)
30 Control unit (stop control means)
40 Seat belt 50 Escape prevention device 51 Iron wheel extension sensor (wheel position detection means)
52 Speed sensor 53 First brake sensor (first detection means)
54 Second brake sensor (second detection means)
55 Seat belt wearing sensor (seat belt wearing detecting means)
56 Switch for confirmation 57 Alarm device (Alarm means)

Claims (2)

The vehicle body is provided with a road traveling wheel and a track traveling wheel. When the road travels, the track traveling wheel is located at a retracted position and travels with the road traveling wheel. When the track travels, the track traveling wheel is tracked. In the runaway prevention device for an orbital work vehicle that travels by driving the wheel for traveling on the track or the wheel for traveling on the road by being positioned at an overhanging position in contact with
Wheel position detection means for detecting whether or not the track running wheel is located at the extended position;
Wheel braking means for braking the track running wheel;
Second braking operation means operated to brake the orbital running wheel by the wheel braking means;
Second detection means for detecting whether or not the second braking operation means is operated;
A confirmation switch provided to detect that the driver is in a drivable state by being operated;
Seat belt wearing detection means for detecting whether or not the driver is wearing a seat belt provided on the vehicle body;
When the wheel position detecting means detects that the orbital running wheel is located at the extended position, the second detecting means detects that the second braking operation means is not operated and the When it is detected by the seat belt mounting means that the driver is wearing the seat belt, at least one of the second braking operation means and the confirmation switch is operated by the second detection means for a predetermined time or more. When not detected, the runaway prevention device for a railroad work vehicle is provided with stop control means for operating the wheel braking means and stopping the travel of the railroad work vehicle. The runaway prevention device for a railroad work vehicle according to claim 1, further comprising alarm means for performing an alarm operation when the stop control means operates the wheel braking means.

Images