JP2024058723A - Railroad work vehicle - Google Patents

Abstract

[Problem] To improve the stability of a rail-mounted work vehicle during operation. [Solution] A rail-mounted work vehicle is equipped with a working device on the vehicle body, can travel on roads and tracks, and is equipped with a rolling stock device. The rolling stock device is equipped with a rolling stock jack that can be extended and retracted in the vertical direction toward the bottom of the vehicle body, a rotating support table 130 that is moved up and down by the rolling stock jack, and a rolling stock jack control unit and a rolling stock control device that control the operation of the rolling stock jack. The high-altitude work equipment is equipped with an operation lever on a work platform control box, a work actuator that operates the high-altitude work equipment, and a high-altitude work control unit and a high-altitude work control device that drive the work actuator in response to operation of the operation lever to operate the high-altitude work equipment. Then, when work is being performed using the high-altitude work equipment, the rolling stock jack control unit and the rolling stock control device operate the rolling stock jack to control the rotating support table 130 to extend downward. [Selected Figure] Figure 7

Description

The present invention relates to a rail-operated work vehicle capable of traveling on roads and railway tracks. In particular, the present invention relates to a rail-operated work vehicle equipped with a rolling stock device for carrying out the work of placing the rail-operated work vehicle on the track at a railroad crossing and for carrying out the work of removing the rail-operated work vehicle from the track to the road.

A road-rail work vehicle (hereafter also referred to as a road-rail vehicle) is a vehicle body that is constructed so that it can travel freely on the road with road-traveling wheels (hereafter also referred to as tire wheels), and has track-traveling wheels (hereafter also referred to as iron wheels) that can be extended or retracted on the front, rear, left and right sides of the body. It has a track-traveling device that can travel on the railway track (rail) with these iron wheels extended, and is widely used when carrying out construction and inspection of railway facilities such as trolley wires on the track. In addition, road-rail work vehicles are usually equipped with a loading and unloading device that makes it easy to load the vehicle body from the road (for example, a railroad crossing) onto the track, or to unload the vehicle body from the track onto the road inside the railroad crossing. Here, loading the vehicle body onto the track is referred to as "loading the track," and unloading the vehicle body from the track is referred to as "unloading."

Conventionally, a rolling stock device equipped with a rolling stock support platform is known as a type of loading and unloading device. The rolling stock support platform is provided on the underside of the body of the road-rail work vehicle so that it can be freely extended downward. When loading or unloading the road-rail work vehicle, for example, the rolling stock support platform is extended downward within a railroad crossing to raise the body above the ground and support the body so that it can rotate horizontally. When loading or unloading the vehicle, the rolling stock support platform is extended downward within a railroad crossing to raise the body above the ground and support the body so that it can rotate horizontally. When loading or unloading the vehicle, the worker pushes the body from this state to change the direction of the body to the direction of the track, extends the iron wheels, and then retracts the rolling stock support platform upward to place the iron wheels on the track (rail) and place the body on the track. A rolling stock device with such a configuration is disclosed, for example, in Patent Document 1.

Patent No. 5635817

The rail-mounted work vehicle disclosed in the above-mentioned Patent Document 1 is configured to have a cargo crane on the vehicle body, but various types of rail-mounted work vehicles are known that are configured to have work devices such as an elevated work device and a crane device mounted on the vehicle body. Such rail-mounted work vehicles may perform work using an elevated work device while traveling on a track, and in such cases, the vehicle body is often supported by the iron wheels with the iron wheels positioned on the track (rail). In rail-mounted work vehicles having an elevated work device and a crane device, it is required to stably support the vehicle body during work, but when the vehicle body is supported by the iron wheels with the iron wheels positioned on the track (rail), it is highly necessary to pay attention to the stable support of the vehicle body. However, in general, the track is provided at an incline in the curved portion, that is, a slope called a cant is provided in which the outer rail is higher than the inner rail. For this reason, when the vehicle body is supported by the iron wheels with the iron wheels positioned on the track (rail) and work is performed, there is a problem that the support stability is easily reduced when the rail-mounted work vehicle travels through a place with a cant. In addition, when the iron wheels are positioned on the track (rail), the vehicle may be stopped, a work jack may be extended to support the vehicle body, and work may be performed using an elevated work device, but in such cases, the iron wheels are often supported in a state where they do not leave the track or only slightly leave it. This is to ensure that the iron wheels return to the track when the work is completed and the support of the work jack is released, but as a result, the vehicle body is supported at an inclination along the cant of the track, which creates the problem of a reduction in support stability.

It is also common to provide a counterweight to improve support stability. However, since road-rail work vehicles are equipped with a road running gear, a track running gear, and a turntable, they tend to be heavier than general aerial work vehicles and crane vehicles, meaning there is little room to add a counterweight.

The present invention was made in consideration of these problems, and aims to provide a rail-mounted work vehicle that is configured to improve stability during work without the need to add counterweights or other measures.

In order to achieve the above-mentioned objectives, the rail-road work vehicle of the present invention is a rail-road work vehicle that has a working device (e.g., an elevated work device equipped with a boom 30 and a work platform 40 in the embodiments) mounted on the vehicle body, has wheels for running on roads (e.g., steering wheels 3S and driving wheels 3D in the embodiments) and wheels for running on tracks (e.g., front iron wheels 12F and rear iron wheels 12R in the embodiments) and can run on roads and tracks, and is configured with a rolling device (e.g., rolling device 110 in the embodiments) for loading and unloading the rail-road work vehicle onto and from the track. The rolling device is configured to include a rolling jack (e.g., rolling jack 120 in the embodiments) that is attached to the vehicle body and can be extended and retracted in the vertical direction toward the bottom of the vehicle body, a rolling support table (e.g., rotating support table 130 in the embodiments) that is attached to the lower end of the rolling jack and moved up and down by the rolling jack, and a jack control device (e.g., rolling jack control unit 81 and rolling control device 85 in the embodiments) that controls the operation of the rolling jack. In addition, the working device (e.g., the swivel platform 20, boom 30, and work platform 40 in the embodiment) is configured with a work operation device (e.g., the work operation device 43 of the work platform operation box 42 in the embodiment) that is operated to perform work using the working device, a work actuator (e.g., the swivel motor 21, boom extension cylinder 31, boom hoisting cylinder 32, and swing motor 41 in the embodiment) that operates the working device, and a work control device (e.g., the high-altitude work control unit 83 and high-altitude work control device 90 in the embodiment) that drives the work actuator in response to the operation of the work operation device to operate the working device. Then, when work is performed using the working device, the jack control device operates the rollover jack to control the rollover support platform to extend downward.

In the above-mentioned rail-mounted work vehicle, the working device is configured to be stored on the vehicle body when not in use, and a storage detector (e.g., storage detector 39 in the embodiment) is provided to detect the storage of the working device, and when the storage detector detects that the working device is no longer in the stored state, it is preferable that the jack control device operates the rolling jack to control the rolling support platform to extend downward.

In addition, in the above-mentioned road-rail work vehicle, the working device is configured to be stored on the vehicle body when not in use, and a storage detector (e.g., storage detector 39 in the embodiment) is provided to detect the storage of the working device, and when the storage detector detects that the working device is in a stored state, it is preferable that the jack control device operates the rollover jack to control the rollover support platform to extend downward.

In addition, in the above-mentioned rail-mounted working vehicle, the working device includes a boom (e.g., the boom 30 in the embodiment) that is at least freely raised and lowered on the vehicle body, and a work platform (e.g., the work platform 40 in the embodiment) on which a worker rides and is attached to the tip of the boom,
It is preferable that the boom is placed on a boom receiver (e.g., boom receiver 38 in the embodiment) provided on the vehicle body and stored, and that the storage detector (e.g., storage detector 39 in the embodiment) is provided on the boom receiver and detects that the boom is placed on the boom receiver to detect storage.

Furthermore, in the above-mentioned road-rail work vehicle, when the track running wheels are extended above the track and work is performed by the working device, it is preferable that the jack control device operates the rolling jack to control the rolling support platform to extend downward.

According to the rail-mounted work vehicle of the present invention, when work is performed by the working device, the jack control device drives the rolling jack to control the rolling support platform to extend downward, so that the center of gravity of the entire rail-mounted work vehicle moves to a lower position. As a result, when the working device is operated and the center of gravity of the rail-mounted work vehicle moves outward, the rolling support platform extends downward and the center of gravity of the entire rail-mounted work vehicle is lowered, so the amount of outward movement of the center of gravity of the rail-mounted work vehicle can be kept small, improving the support stability of the vehicle body. In other words, compared to when the rolling support platform is raised and stored, the amount of outward movement of the center of gravity of the rail-mounted work vehicle when the working device is operated is smaller when the rolling support platform is extended downward, improving the support stability of the vehicle body.

In the above-mentioned road-rail work vehicle, when the storage detector detects that the working device is no longer in the stored state, it is preferable that the jack control device drives the rolling stock jack to control the rolling stock support platform to extend downward. Since work using the working device is performed after the working device is put into a non-stored state from a stored state, by controlling in this manner, the rolling stock support platform can be appropriately extended downward when work is performed, ensuring stable support.

In addition, in the above-mentioned road-rail work vehicle, when the storage detector detects that the working device is in a stored state and a specified operation is performed on the work operation device, it is preferable that the jack control device drives the rollover jack to control the rollover support platform to extend downward. Since work using the working device can only be started when the work operation device is operated from a stored state of the working device, by controlling in this manner, the rollover support platform can be extended downward appropriately when necessary, ensuring support stability.

In addition, in the above-mentioned road-rail work vehicle, if the working device comprises the boom and a work platform attached to the tip of the boom on which a worker sits, and the boom is placed on a boom receiver provided on the vehicle body and stored, it is preferable that the storage detector is provided on the boom receiver. In this way, storage of the boom can be detected accurately and precisely.

Furthermore, in the above-mentioned road-rail work vehicle, when the track running wheels are extended above the track so that the road-rail work vehicle can run on the track and work is being performed by the working device, it is preferable that the jack control device drives the rolling stock jack to control the rolling stock support platform to extend downward. When the car body is supported by the iron wheels with the iron wheels positioned on the track (rail), particular attention must be paid to stable support of the car body, and in such a case, support stability can be improved by extending the rolling stock support platform downward. When working with the road-rail work vehicle body supported by the iron wheels with the iron wheels positioned on the track (rail), when work is being performed in a position where there is a cant on the track, as described below,
A particularly remarkable effect is obtained.

1 is a side view showing the appearance of a rail-mounted working vehicle equipped with a turntable device according to the present invention. 2 is an enlarged cross-sectional plan view showing the general configuration of the lower part of the rolling device. FIG. This is a block diagram showing the configuration of a control system for switching the above-mentioned rail-mounted work vehicle between road travel and track travel using a turntable device (track-mounting work and track-retracting work) and for working at height. This is a plan view showing the state in which the rail-road working vehicle has moved into the railroad crossing. This is a schematic cross-sectional view showing a rail-mounted work vehicle mounted on rails, cut from the rear of the turntable device and looking forward. This is a schematic cross-sectional view showing a rail-mounted work vehicle mounted on a canted rail, cut from the rear of the rolling stock device and looking forward. This is a schematic cross-sectional view showing a rail-mounted work vehicle mounted on a canted rail with the rollover device extended downward, cut from the rear of the rollover device and looking forward. This is a schematic cross-sectional view showing a rail-mounted work vehicle mounted on rails with the rollover device extended downward, cut from the rear side of the rollover device and looking forward.

The following describes an embodiment of the present invention with reference to the drawings. FIG. 1 shows a side view of a road-rail working vehicle 1 according to the present invention. In FIG. 1, the road-rail working vehicle 1 has a vehicle body 2 with a driver's cabin 4 at the front, and is based on a truck vehicle that can run on roads using road-running wheels consisting of a pair of left and right tires and wheels, steering wheels 3S, arranged at the front of the vehicle body 2, and a pair of left and right tires and wheels, driving wheels 3D, arranged at the rear of the vehicle body 2. The vehicle body 2 is configured with a vehicle body frame consisting of a chassis frame 5 and a subframe 6 attached to the chassis frame 5. Here, FIG. 1 shows only the steering wheel 3S and driving wheel 3D on the left side of the vehicle body 2, but similar steering wheel 3S and driving wheel 3D are also provided on the right side of the vehicle body 2.

A work jack 15 is provided behind the steering wheels 3S and behind the drive wheels 3D of the vehicle body 2. The work jack 15 is composed of an upper jack body 15a fixed to the vehicle body frame, a lower jack body 15b arranged inside the upper jack body 15a so that it can move downward, and a jack cylinder 16 connected to the upper jack body 15a and the lower jack body 15b. The jack cylinder 16 moves in an expanding and contracting manner, so that the lower jack body 15b moves downward relative to the upper jack body 15a. The work jack 15 is mainly used when the road-rail work vehicle 1 is working, and the lower jack body 15b moves downward due to the expanding and contracting movement of the jack cylinder 16, thereby lifting and supporting the vehicle body 2, thereby stably supporting the entire vehicle body 2.

On the rear side of the work jack 15 behind the steering wheel 3S, there are provided a front iron wheel 12F supported so as to be freely swingable up and down on the vehicle frame, and a front iron wheel rocking device 45 having a front iron wheel rocking cylinder 13F for rocking the front iron wheel 12F up and down between the storage position (position shown by the two-dot chain line in the figure) and the extension position (position shown by the solid line in the figure). Also, on the rear side of the work jack 15 behind the driving wheel 3D, there are provided a rear iron wheel 12R supported so as to be freely swingable up and down on the vehicle frame, and a rear iron wheel rocking device 46 having a rear iron wheel rocking cylinder 13R for rocking the rear iron wheel 12R up and down between the storage position (position shown by the two-dot chain line in the figure) and the extension position (position shown by the solid line in the figure).

The above-mentioned stored position refers to a position where the front iron wheels 12F and rear iron wheels 12R are raised to a predetermined height above the traveling road surface when the road-rail working vehicle 1 travels on a road or the like using the steering wheels 3S and driving wheels 3D (the position of the front iron wheels 12F and rear iron wheels 12R shown by the two-dot chain line in Fig. 1). The above-mentioned extended position refers to a position where the front iron wheels 12F and rear iron wheels 12R are positioned on the track, the steering wheels 3S and driving wheels 3D are positioned above and away from the track R, and the front iron wheels 12F and rear iron wheels 12R are extended to a position where the vehicle can travel on the track R using the front iron wheels 12F and rear iron wheels 12R, as shown by the solid line in Fig. 1.

Note that while FIG. 1 only shows the front iron wheel 12F and rear iron wheel 12R on the left side of the car body 2, similar front iron wheel 12F and rear iron wheel 12R are also provided on the right side of the car body 2. Also, while only the work jack 15, front iron wheel rocking cylinder 13F, front iron wheel rocking device 45, rear iron wheel rocking cylinder 13R, and rear iron wheel rocking device 46 on the left side of the car body 2 are shown, similar work jack 15, front iron wheel rocking cylinder 13F, front iron wheel rocking device 45, rear iron wheel rocking cylinder 13R, and rear iron wheel rocking device 46 are also provided on the right side of the car body 2.

The front iron wheel rocking cylinder 13F of the front iron wheel rocking device 45 and the rear iron wheel rocking cylinder 13R of the rear iron wheel rocking device 46 are extended and retracted to rock the front iron wheel 12F and the rear iron wheel 12R up and down between the storage position and the extension position, and the control is performed by an operator operating the iron wheel operating device 72 (see FIG. 3). Although not shown in FIG. 1, the iron wheel operating device 72 is provided at a position at the rear end position or side end position of the car body 2 where the operator can easily operate it, and the operator operates the iron wheel operating device 72 to extend and retract the front iron wheel rocking cylinder 13F and the rear iron wheel rocking cylinder 13R to rock the front iron wheel 12F and the rear iron wheel 12R up and down between the storage position and the extension position. Although not shown in FIG. 1, an iron wheel extension detector 95 is provided to detect when the front iron wheel 12F and the rear iron wheel 12R are extended (see FIG. 3). The iron wheel extension detector 95 may be configured to not only detect when the front iron wheels 12F and rear iron wheels 12R are in the extended position, but also when they are in the retracted position.

The system that performs this control is configured as shown in FIG. 3. As shown in FIG. 3, the operation signal from the iron wheel operating device 72 is input to the controller 80, and the operation of the iron wheel control device 86 is controlled by the iron wheel swing control unit 82 of the controller 80. The iron wheel control device 86 is composed of, for example, a hydraulic pump driven by an engine or an electric motor, and an iron wheel hydraulic control valve that controls the supply of hydraulic oil discharged from this hydraulic pump to the front iron wheel swing cylinder 13F and the rear iron wheel swing cylinder 13R. The iron wheel swing control unit 82 of the controller 80 controls the drive of the iron wheel hydraulic control valve, and controls the supply of hydraulic oil to the front iron wheel swing cylinder 13F and the rear iron wheel swing cylinder 13R in response to the operation of the iron wheel operating device 72. As a result, when the worker operates the iron wheel operating device 72, the front iron wheel swing cylinder 13F and the rear iron wheel swing cylinder 13R are extended and retracted in response to the operation, and the front iron wheel 12F and the rear iron wheel 12R can be swung up and down between the storage position and the extension position.

A rolling device 110 is provided at the center lower part of the car body 2. As shown in FIG. 2, the rolling device 110 is configured to have a rolling jack 120 that is provided at the lower part of the car body 2 and can be extended downward, and a rotating support table (rolling support base) 130 provided at the lower end of the rolling jack 120. The rolling jack 120 has two telescopic posts (left telescopic post 121L and right telescopic post 121R) that are offset from each other in the front-rear direction and arranged side by side at a distance from each other in the left-right direction (vehicle width direction). The left telescopic post 121L is configured to be telescopically movable in the vertical direction downward by the telescopic movement of the rolling telescopic cylinder 122L provided therein. Similarly, the right telescopic post 121R is configured to be telescopically movable in the vertical direction downward by the telescopic movement of the rolling telescopic cylinder 122R provided therein. The amount of extension of the left telescopic post 121L and the amount of extension of the right telescopic post 121R can be adjusted to be the same or different. The rolling jack 120 is configured to be able to extend and retract in the vertical direction downward by the two telescopic posts 121L, 121R extending and retracting in the vertical direction.

The telescopic posts 121L, 121R are controlled to extend and retract in the vertical direction by an operator operating the rolling car operating device 71 (see FIG. 3). Although not shown in FIG. 1, the rolling car operating device 71 is provided at a position that is easy for an operator to operate at the rear end or side end of the car body 2. The operator operates the rolling car operating device 71 to extend and retract the left and right rolling car telescopic cylinders 122L, 122R to extend and retract the left and right telescopic posts 121L, 121R in the vertical direction, to extend and retract the rolling car jack 120 downward, and to move the rotating support table (rolling car support base) 130 provided at the lower end of the rolling car jack 120 up and down. Although not shown in FIG. 1, the rolling car extension detector 96 is provided in the rolling car device 110 to detect the extension position (amount) when the rotating support table 130 is extended downward during high-altitude work on the track as described later.

The system that performs this control is configured as shown in Figure 3. In this system, an operation signal from the rolling stock operation device 71 is input to the controller 80, and the operation of the rolling stock control device 85 is controlled by the rolling stock jack control unit 81 of the controller 80. The rolling stock control device 85 is composed of, for example, a hydraulic pump driven by an engine or electric motor, and a rolling stock hydraulic control valve that controls the supply of hydraulic oil discharged from this hydraulic pump to the left and right rolling stock telescopic cylinders 122L, 122R. The rolling stock jack control unit 81 of the controller 80 controls the operation of the rolling stock hydraulic control valve, and controls the supply of hydraulic oil to the left and right rolling stock telescopic cylinders 122L, 122R in response to the operation of the rolling stock operation device 71. As a result, when an operator operates the rolling operation device 71, the left and right rolling telescopic cylinders 122L, 122R are extended and retracted in response to the operation, the rolling jack 120 is extended and retracted downward, and the rotating support table (rolling support base) 130 provided at the lower end of the rolling jack 120 can be raised and lowered. When the rotating support table (rolling support base) 130 is raised and lowered in this manner, a detection signal from the rolling extension detector 96 is input to the controller 80, and the control based on this input will be described later.

The rotary support table 130 is configured with an upper plate 131 that is horizontally arranged at the lower end of the rolling jack 120 to connect the lower ends of the two telescopic posts 121L and 121R, and a lower plate 135 that is horizontally arranged at the lower part of the upper plate 131 so as to be rotatable around a rotation center axis O that extends vertically. As shown in FIG. 2, a rotary drive motor 132 is provided on the side of the upper plate 131, and a pinion gear (not shown) is attached to the drive shaft that protrudes downward from the rotary drive motor 132. Meanwhile, a large-diameter rotary gear 136 is attached to the upper surface of the lower plate 135, and driven gear teeth 136a are formed on its outer circumferential surface. A pinion gear attached to the drive shaft of the rotary drive motor 132 meshes with the driven gear teeth 136a. Therefore, when the pinion gear is rotated by the rotary drive motor 132, the rotary drive force is transmitted to the rotary gear 136 via the driven gear teeth 136a that mesh with the pinion gear, and the lower plate 135 to which the driven gear 136 is attached can be rotated relative to the upper plate 131.

In the turntable device 110, the turntable jack 120 can be extended downward to bring the lower plate 135 of the rotary support table 130 into contact with the ground, thereby lifting and supporting the car body 2 from the ground. Then, in this lifted and supported state, the upper plate 131 and the turntable jack 120 can be rotated relative to the lower plate 135 to change the direction of the car body 2 and perform loading and unloading work. This direction change is performed by a worker pushing the car body 2 while it is lifted and supported by the turntable device 110, rotating the upper plate 131 and the turntable jack 120 relative to the lower plate 135. It is also possible to rotate the upper plate 131 relative to the lower plate 135 using the rotary drive motor 132.

The turning device 110 is located at the lower center of the car body 2, but as shown in FIG. 4, the rotation center axis O, which extends vertically and is the center of rotation of the lower plate 135 of the rotating support table 130 relative to the upper plate 131, is located at the center of the width of the car body 2. Furthermore, the pair of left and right front iron wheels 12F, 12F are located symmetrically in the width direction of the car body 2, and the pair of left and right rear iron wheels 12R, 12R are also located symmetrically in the width direction of the car body 2. That is, the pair of left and right front iron wheels 12F, 12F and the pair of left and right rear iron wheels 12R, 12R are located symmetrically with respect to the front-rear axis A1 that extends forward and backward through the rotation center axis O. In addition, the front iron wheel axis connecting the pair of left and right front iron wheels 12F, 12F and the rear iron wheel axis connecting the pair of left and right rear iron wheels 12R, 12R are parallel to the left-right axis A2 that extends in the width direction through the rotation center axis O and are perpendicular to the front-rear axis A1.

As described above, in the rolling stock device 110, the rolling stock jack 120 is extended downward and the rotary support table 130 is extended downward to support the car body and perform loading and unloading operations, but when traveling on the road or on the track, the rolling stock jack 120 is contracted upward and the rotary support table 130 is moved upward to store and hold the car. When storing and holding the car in this way, the lower plate 135 is held in a rotated position in which its length direction extends in the left-right direction (in the direction of the left-right axis A2) and its width direction extends in the front-rear direction (in the direction of the front-rear axis A1), as shown by the solid line in Figure 4.

At the front of the mounting area (at the front of the subframe 6) behind the driver's cabin 4, a swivel base 20 is provided, which is configured to be able to rotate horizontally by driving a swivel motor 21. A boom 30 is attached to a support 22 extending upward from the swivel base 20, with a foot pin 23 as an axis, so that it can swing (raise and lower) in the vertical direction. The boom 30 is configured by combining a base boom 30a, an intermediate boom 30b, and a tip boom 30c, which are attached to the support 22 by the foot pin 23 so that they can be raised and lowered, in a nested manner. A boom telescopic cylinder 31 is provided inside the boom 30, and the boom 30 can be telescopically moved in the longitudinal direction by the telescopic movement of the boom telescopic cylinder 31. A boom hoisting cylinder 32 is provided between the base boom 30a and the support 22, and the boom hoisting cylinder 32 can be telescopically moved to raise and lower the boom 30 in the vertical plane.

A workbench support bracket 35 is attached to the tip of the tip boom 30c so as to be able to swing within the boom 30's elevation surface. The workbench support bracket 35 is configured so that the upper surface of the workbench support bracket 35 is always kept horizontal regardless of the elevation angle of the boom 30 by the extension and retraction of a leveling cylinder 36 provided inside. The extension and retraction of the leveling cylinder 36 is controlled according to the detection value of an inclination angle sensor (not shown) that detects the inclination angle of the workbench 40. The workbench 40 is attached to the upper surface of the workbench support bracket 35 so as to be freely rotated horizontally. A swivel motor 41 is provided inside the workbench support bracket 35, and the workbench 40 can be rotated horizontally (swivel operation) relative to the workbench support bracket 35 by driving the swivel motor 41. As described above, since the upper surface of the workbench support bracket 35 is always kept horizontal, the floor surface of the workbench 40 is also kept horizontal regardless of the elevation angle of the boom 30. The work platform 40 is provided with a work platform operation box 42 having a work operation device 43 operated by an operator to drive various hydraulic actuators such as the swing motor 21, boom extension cylinder 31, boom hoisting cylinder 32, and swing motor 41. This work operation device 43 is composed of an operation lever and operation switches operated by the operator.

The system for controlling the rotation of the swivel base 40, the raising and lowering of the boom 30, and the horizontal rotation (swinging operation) of the work platform 40 is configured as shown in Fig. 3. These controls are performed by the worker by operating the operation levers and operation switches provided on the work operation device 43. For this reason, as shown in Fig. 3, when the operation levers and operation switches of the work operation device 43 are operated, the operation signals are input to the controller 80, and the operation of the work at height control device 90 is controlled by the work at height control section 83 of the controller 80. The work at height control device 90 is configured, for example, by a hydraulic pump driven by an engine or an electric motor, and a hydraulic control valve for work at height that controls the supply of hydraulic oil discharged from the hydraulic pump to the rotation motor 21, the boom extension cylinder 31, the boom hoisting cylinder 32, and the swing motor 41. The work at height control section 83 of the controller 80 controls the drive of the hydraulic control valves for work at height of the work at height control device 90 in response to the operation of the control levers and switches of the work operation device 43, and controls the supply of hydraulic oil to the swing motor 21, boom telescopic cylinder 31, boom hoisting cylinder 32, and swing motor 41. As a result, when the worker operates the control levers and switches of the work operation device 43, the swing motor 21, boom telescopic cylinder 31, boom hoisting cylinder 32, and swing motor 41 can be driven in response to that operation.

In this way, when the slewing motor 21, the boom telescopic cylinder 31, the boom hoisting cylinder 32, and the swing motor 41 are driven, the slewing base 40 can be rotated, the boom 30 can be raised and lowered, and the work platform 40 can be rotated horizontally in response to the driving. As a result, the work platform 40 can be moved to a desired height as shown by the two-dot chain line in FIG. 1, and a worker riding on the work platform 40 can perform the desired high-altitude work. When high-altitude work is not being performed, the boom 30 can be folded backward and stored on the vehicle body 2 as shown by the solid line in FIG. 1. A boom receiver 38 for supporting the boom 30 in this stored position is provided on the vehicle body 2, and a storage detector 39 is provided on the boom receiver 38 to detect that the boom 30 is in a stored state by placing the boom 30 on it. A detection signal from the storage detector 39 is input to the controller 80, and control based on this input will be described later.

The road-rail work vehicle 1 configured as described above can store the front iron wheels 12F and rear iron wheels 12R and travel on roads using the steering wheels 3S and drive wheels 3D, and can also extend the front iron wheels 12F and rear iron wheels 12R over the railroad crossing 50 and travel on tracks. At this time, the iron wheel extension detector 95 detects whether the front iron wheels 12F and rear iron wheels 12R are in the stored position or the extended position. In this way, the above-mentioned rolling stock device 110 is provided to switch between road travel and track travel. The work of switching between road travel and track travel using this rolling stock device 110 (laying on the track and retracting the track) will be described below.

The loading and unloading operations using the turntable 110 are carried out, for example, within a railroad crossing. FIG. 4 shows a plan view of the railroad work vehicle 1 moving into the railroad crossing 50, where a track R having a pair of left and right rails 60, 60 extends perpendicularly across the road 51. In order to prevent the rails 60 from interfering with the running of a vehicle through the crossing, the road surface is formed so that the upper surface of the road 51 outside the left and right rails 60, 60 coincides with the upper surface of the rails 60, and the upper surface of the road 55 between the rails 60, 60 also coincides with the upper surface of the rails 60. To perform the rolling operation, the railroad work vehicle 1 is moved and stopped so that the center of rotation O of the lower plate 135 of the turntable 110 is located at the center position of the rails 60, 60, as shown in FIG. 4. This is because, as mentioned above, the pair of left and right front iron wheels 12F, 12F and the pair of left and right rear iron wheels 12R, 12R are positioned symmetrically with respect to the front-rear axis A1 that extends forward and backward through the central axis of rotation O. Note that at this time, the vehicle is traveling on a road, and the front iron wheels 12F and rear iron wheels 12R are stored.

In this state where the road-rail working vehicle 1 is moved so that the rotation center O of the lower plate 135 is located at the center position of the rails 60, 60, the lower plate 135 of the rolling stock device 110 is stored and held in a rotation position in which its longitudinal direction extends in the left-right direction (in the direction of the left-right axis A2) and its lateral direction extends in the front-rear direction (in the direction of the front-rear axis A1) as described above. First, the rolling stock operating device 71 is operated to drive the rotation drive motor 132, and the lower plate 135 is rotated 90 degrees to a rotation position in which its longitudinal direction extends in the front-rear direction (in the direction of the front-rear axis A1) and its lateral direction extends in the left-right direction (in the direction of the left-right axis A2) as shown by the two-dot chain line in Figure 4. This causes the lower plate 135 to straddle the left and right rails 60, 60. From this state, the rolling stock operating device 71 is operated to move the rotary support table 130 (upper plate 131 and lower plate 135) downward with the rolling stock jack 120, and the lower plate 135 is brought into contact with the rail 60 and the road 55 between the rails 60, 60, and the rolling stock device 110 lifts and supports the car body 2. Thereafter, the worker pushes the car body 2, etc., to rotate the upper plate 131 and the road-rail work vehicle 1 connected thereto by 90 degrees relative to the lower plate 135.

Then, as shown by the two-dot chain line in FIG. 4, the car body 2 faces the direction in which the track R extends, and the pair of left and right front iron wheels 12F, 12F and the pair of left and right rear iron wheels 12R, 12R are positioned directly above the rails 60, 60. Then, the iron wheel operating device 72 is operated to move the front iron wheels 12F and the rear iron wheels 12R to the extended position. At this time, the iron wheel extension detector 95 detects that the front iron wheels 12F and the rear iron wheels 12R have moved to the extended position. After this, the rolling stock operating device 71 is operated to release the lifting support of the car body 2 by the rolling stock device 110, that is, the rolling stock jack 120 is used to pull up and store the rotating support table 130 (upper plate 131 and lower plate 135), and the pair of left and right front iron wheels 12F, 12F and the pair of left and right rear iron wheels 12R, 12R are placed on the rails 60, 60, resulting in the state shown in FIG. 1, and the wiring work is completed. At this time, the lower plate 135 is in a rotated position in which its length extends in the left-right direction of the vehicle body and its width extends in the front-rear direction, so it is stored and held in that position.

The above describes the loading operation of the rail-road work vehicle 1, which has been traveling on the road up to the railroad crossing, onto the track R within the crossing. However, by performing the reverse operation to that described above within the crossing, it is possible to perform the derailment operation of moving the rail-road work vehicle 1 from the track R to the road.

After the rail-mounted work vehicle 1 is placed on the rails 60, 60 as described above, high-altitude work may be performed while stopped or traveling at a low speed. An example of such a working state is shown in Figure 5. Figure 5 shows the rail-mounted work vehicle 1 in cross section at the rear of the rolling stock device 110 and viewed forward, with the left and right front iron wheels 12F, 12F extended downward by the left and right front iron wheel rocking devices 45, 45 and placed on the left and right rails 60, 60. Although not shown in Figure 5, the left and right rear iron wheels 12R, 12R are also extended downward by the left and right rear iron wheel rocking devices 46, 46 and placed on the left and right rails 60, 60. In this working state, the rotating table 20 is rotated and the boom 30 is raised and extended, and the work platform 40 is located above the left side of the vehicle body. The position of the center of gravity of the road-rail vehicle 1 in this state within the plane of Figure 5 is indicated by the symbol G1 (1), and is located to the left of the center C in the left-right direction of the vehicle body by a distance D1 (1), and is located inward (to the right) by a distance D2 (1) from the left front iron wheel 12F. In the state of Figure 5, the rotating support table 130 (upper plate 131 and lower plate 135) of the turntable 110 is pulled up and stored.

In the state shown in FIG. 5, a tipping moment acts to the left, so the stability of the road-rail work vehicle 1 is determined by the stabilizing moment M1 = W1 x D2 (1) generated by the weight W1 of the road-rail work vehicle 1 against the left front and rear iron wheels 12F, 12R. When the work platform 40 is positioned on the left side as shown in FIG. 5, a moment (tipping moment) M2 acts in the tipping direction according to the weight of the work platform 40 and the weight and position of the boom 30. If this tipping moment M2 becomes larger than the stabilizing moment M1, there is a risk of tipping, so the movement of the boom 30 and the work platform 40 is restricted to prevent this situation from occurring. By restricting movement (working range restriction) in this way, it is possible to work at height while the road-rail work vehicle 1 is parked on the rails 60, 60 and is stopped or traveling at a low speed.

As mentioned above, the track (rails 60, 60) has a cant in the curved portion, and generally the rail 60 on the outside of the curve is higher than the rail 60 on the inside. For this reason, when the vehicle body is supported by the front and rear iron wheels 12F, 12R with the iron wheels positioned on the track (rail) and work is performed, there is a problem that the support stability is likely to decrease when the road-rail working vehicle 1 travels through a place with a cant. This will be explained with reference to FIG. 6.

Figure 6 shows rails 60, 60 with a cant at a curved section, with the right rail 60 on the outside of the curve being higher than the left rail 60 on the inside of the curve. When the road-rail work vehicle 1 runs on the rails 60, 60 with a cant like this, the car body 2 tilts to the left as shown in the figure, and the center of gravity position G1 (2) of the road-rail work vehicle 1 in the plane of Figure 6 moves to the left accordingly. For this reason, as shown in Figure 6, the distance D1 (2) from the center of the car body is larger than when there is no cant as in Figure 5. That is, D1 (2) > D1 (1). As a result, the distance D2 (2) of the center of gravity position G1 (2) relative to the left front iron wheel 12F (and rear iron wheel 12R) is smaller than when there is no cant as in Figure 5. That is, D2 (2) < D2 (1). As a result, the stability moment of the road-rail work vehicle 1 is M1 = W x D2 (2), which is smaller than the case of Figure 5. In other words, the operational stability of the road-rail work vehicle decreases in areas with cant.

In view of this, when the road-rail work vehicle 1 is placed on the rails 60, 60 and then works at high altitudes while stopped or traveling at a low speed, as shown in FIG. 7, the turntable 110 controls the turntable jack 120 to extend the rotating support table 130 (upper plate 131 and lower plate 135) downward. This control is performed by the controller 80 in the control system of FIG. 3 upon receiving a detection signal from the storage detector 39. When the road-rail work vehicle 1 is placed on the rails 60, 60, the boom 30 is placed on the boom receiver 38 and in a stored state, and when the vehicle is placed on the rails, the boom 30 is in a stored state. Also, as described above, when the loading work is completed, the rotating support table 130 (upper plate 131 and lower plate 135) is pulled up and in a stored state. Therefore, in this state, the storage detector 39 detects that the boom 30 is placed on the boom receiver 38 and in a stored state, and the detection signal is sent to the controller 80.

When the boom 30 is raised from this state and separated from the boom receiver 38, this is detected by the storage detector 39, and the detection signal is sent to the controller 80. Upon receiving this detection signal, the rolling jack control unit 81 of the controller 80 causes the rolling jack 120 (left and right rolling telescopic cylinders 121L, 121R) to extend via the rolling control device 85, causing the rotating support table 130 (upper plate 131 and lower plate 135) to move downward. At this time, the rolling extension detector 96 detects the amount of downward movement (amount of downward extension) of the rotating support table 130, and upon receiving this detection signal, the rolling jack control unit 81 of the controller 80 controls the movement of the underside of the rotating support table 130 (underside of the lower plate 135) until it is close to the rails 60, 60. In other words, the underside of the rotating support table 130 (the underside of the lower plate 135) does not come into contact with the rails 60, 60, and the road-rail work vehicle 1 can travel on the rails 60, 60, but the rotating support table 130 is controlled to move downward as far as possible.

Although the control to move the rotating support table 130 downward in this manner is performed when the storage detector 39 detects that the boom 30 has left the boom receiver 38, other methods may be used to detect that the boom 30 is no longer in the stored state. For example, the control to move the rotating support table 130 downward may be performed when the work operation device 43 is operated to raise the boom 30 from the stored state. Furthermore, when the loading work of loading the road-rail work vehicle 1 onto the rails 60, 60 is completed, the control to move the rotating support table 130 downward may be performed subsequently.

As shown in FIG. 8, when the rotating support table 130 (upper plate 131 and lower plate 135) is extended downward, the support stability against the vehicle body tilting is improved. This effect is particularly noticeable when the road-rail work vehicle 1 is positioned on the rails 60, 60 with a cant. FIG. 7 shows the case where the road-rail work vehicle 1 is positioned on the rails 60, 60 with a cant with the rotating support table 130 moved downward. In FIG. 7, the center of gravity position of the rolling stock device 110 when the rotating support table 130 is stored upward is indicated by the symbol G2 (1), and the center of gravity position of the rolling stock device 110 when the rotating support table 130 is moved downward is indicated by the symbol G2 (2). When the rotating support table 130 is moved downward, the center of gravity position G2 (1) moves diagonally downward to the right as shown in the figure to the center of gravity position G2 (2), and the moment in the right direction (clockwise direction) acting on the vehicle body, i.e., the stability moment, increases.

The center of gravity of the entire road-rail work vehicle 1 is at position G1 (3), which is located to the right of the center of gravity G1 (2) (center of gravity shown in FIG. 6) when the rotating support table 130 is stored at the top, and the distance D1 (3) from the center C in the left-right direction of the vehicle body is smaller than the distance D1 (2) when the rotating support table 130 is stored at the top as shown in FIG. 6. Therefore, the distance D2 (3) of the center of gravity G1 (3) relative to the left front iron wheel 12F (and rear iron wheel 12R) is larger than the distance D2 (2) when the rotating support table 130 is stored at the top as shown in FIG. 6. In other words, D2 (3) > D2 (2). As a result, the stability moment of the road-rail work vehicle 1 is M1 = W x D2 (3), which is larger than the case of FIG. 6. In other words, stability is improved. This improves the stability of the road-rail work vehicle 1 when it is placed on the rails 60, 60, and improves safety when working at high altitudes while stopped or traveling at low speed.

As described above, when the rotating support table 130 is extended downward on the canted rails 60, 60, i.e., when the road-rail work vehicle 1 is tilted, the support stability of the vehicle body is improved. In other words, when the rotating support table 130 is extended downward, the stability when the vehicle body is tilted is improved. As can be seen from this, when the high-altitude work device is operated and the center of gravity of the road-rail work vehicle 1 moves outward, the rotating support table 130 (turntable support platform) is extended downward to lower the center of gravity of the road-rail work vehicle 1 as a whole, so the amount of outward movement of the center of gravity of the road-rail work vehicle 1 can be kept small, and the support stability of the vehicle body is improved. In this way, compared to when the rotating support table 130 is raised and stored, when the rotating support table 130 is extended downward, the amount of outward movement of the center of gravity of the road-rail work vehicle 1 when the work device is operated is smaller, and the support stability of the vehicle body is improved.

As described above, when the rotating support table 130 is extended downward, the stability of the vehicle body is improved against a slight tilt caused by the movement of the center of gravity of the vehicle body due to the operation of the boom 30, even when the vehicle body is positioned on rails 60, 60 with no cant as shown in FIG. 8. In other words, extending the rotating support table 130 downward improves the stability of the vehicle body against tilt. For this reason, as described above, the rotating support table 130 may be controlled to extend downward not only when the vehicle is on a line, but also when the work jack 15 is extended to lift and support the vehicle body 2 while the vehicle is traveling on a road. This improves the support stability of the vehicle body even when the work jack 15 is extended to lift and support the vehicle body 2 to perform work at height.

When performing high-altitude work with the road-rail working vehicle 1 mounted on the rails 60, 60 and stopped, the work jack 15 may be extended to support the vehicle body. In such a case, the iron wheels 12F, 12R are supported in a state where they do not leave the rails 60, 60 or leave them only slightly. This is to ensure that the iron wheels 12F, 12R return to the rails 60, 60 when the work is completed and the support of the work jack 15 is released, but as a result, the vehicle body is supported while remaining inclined along the cant, which creates a problem that the support stability is likely to decrease. Even in such a case, the support stability of the vehicle body can be improved by controlling the rotary support table 130 to extend downward.

REFERENCE SIGNS LIST 1 Road-rail work vehicle 2 Vehicle body 3S Steering wheel 3D Drive wheel 12F Front iron wheel 12R Rear iron wheel 38 Boom receiver 39 Storage detector 42 Work platform operation box 43 Work operation device 45 Front iron wheel swing device 46 Rear iron wheel swing device R Track 61 Rail
71 Rolling car operation device 72 Iron wheel operation device 80 Controller 81 Rolling car jack control unit 82 Iron wheel swing control unit 83 Height work control unit 90 Height work control device 95 Iron wheel extension detector 110 Rolling car device 120 Rolling car jack 130 Rotation support table

Claims (5)

A rail-road work vehicle equipped with a working device on a vehicle body, having road-running wheels and track-running wheels and capable of running on roads and tracks, and equipped with a rolling device for loading and unloading the rail-road work vehicle onto and from the track,
The turning device is
The vehicle is provided with a rolling jack that is extendable and retractable in the vertical direction toward the bottom of the vehicle, a rolling support base that is provided at the lower end of the rolling jack and is moved up and down by the rolling jack, and a jack control device that controls the operation of the rolling jack.
The working device is
The present invention is configured to include a work operation device that is operated to perform work using the work device, an actuator that operates the work device, and a work control device that drives the actuator in response to operation of the work operation device to operate the work device,
A rail-mounted work vehicle characterized in that, when work is being performed using the working device, the jack control device operates the rollover jack to control the rollover support platform to be extended downward. The working device is configured to be stored on the vehicle body when the working device is not in use, and a storage detector is provided for detecting storage of the working device.
A rail-mounted work vehicle as described in claim 1, characterized in that when the storage detector detects that the working device is no longer in a stored state, the jack control device operates the rollover jack to control the rollover support platform to extend downward. The working device is configured to be stored on the vehicle body when the working device is not in use, and a storage detector is provided for detecting storage of the working device.
A rail-mounted work vehicle as described in claim 1, characterized in that when the storage detector detects that the work equipment is in a stored state and a specified operation is performed on the work operation device, the jack control device operates the rollover jack to control the rollover support platform to extend downward. the working device comprises a boom that is at least freely raised and lowered on the vehicle body, and a work platform on which an operator sits that is attached to a tip of the boom, and the boom is placed on a boom receiver that is provided on the vehicle body and stored;
4. A rail-mounted work vehicle as claimed in claim 2 or 3, characterized in that the storage detector is provided on the boom receiver and detects that the boom is placed on the boom receiver to detect storage. A road-rail work vehicle according to any one of claims 1 to 3, characterized in that when the track running wheels are extended above the track and the work device is performing work, the jack control device operates the rolling stock jack to control the rolling stock support platform to extend downward.

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