Turntable for rail-road vehicles

Abstract

To provide a turntable device for a road-rail vehicle capable of safely and easily rotating a rotating plate for grounding.SOLUTION: A turntable device 110 has a jack 120 for turning a vehicle comprising a left telescopic post 121L and a right telescopic post 121R; a rotation supporting table 130 disposed on a lower end part of the jack 120 for turning the vehicle. The rotation supporting table 130 has an upper plate 131 horizontally disposed to connect respective end parts of the left telescopic post 121L and the right telescopic post 121R, and a lower plate 135 rotatably disposed on a lower part of the upper plate 131 to be rotated and operated by a rotation driving motor 132. Only when the telescopic operation amount of the jack 120 for rotating the vehicle is a telescopic operation amount at which the lower plate 135 is in no contact with the ground, the rotation operation of the lower plate 135 by the rotation driving motor 132 is allowed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vehicle turning device for a track-land vehicle for performing a direction change of the track-land vehicle that can travel on roads and tracks.

Background Art

[0002] The track-land vehicle is configured to be able to travel on roads by road-running wheels (hereinafter also referred to as tire wheels), and track-running wheels (hereinafter also referred to as iron wheels) that can be projected / retracted are provided on the front, rear, left, and right of a vehicle body configured to be able to travel freely on roads. It has a track-running device that can travel on a railway track (rail) in a state where the track-running wheels are projected, and is widely used when performing construction and inspection of railway facilities such as trolley lines on the track. In addition, the track-land vehicle usually includes a turning device for changing the direction of the vehicle body when loading the vehicle body from a road (for example, a level crossing) onto the track or unloading the vehicle body from the track onto the road (for example, a level crossing). Here, loading the vehicle body onto the track is referred to as "lining up", and unloading the vehicle body from the track is referred to as "departing from the line".

[0003] The turning device, also called a turntable, is composed of a turning jack provided on the vehicle body of the track-land vehicle and capable of expanding and contracting in the vertical direction downward, a rotating plate support member provided at the lower end of the turning jack, and a grounding rotating plate provided rotatably around a vertical axis at the lower part of the rotating plate support member. In the turning device, the turning jack is extended downward to ground the grounding rotating plate to lift the vehicle body from the ground, and the vehicle body is rotated by rotating the support member and the turning jack with respect to the grounding rotating plate. board By rotating the support member and the turning jack, it is possible to change the direction of the vehicle body.

[0004] When the turntable is not in use, such as when a rail-road vehicle is in motion, the grounding turntable is moved upward by the turntable jack and stored at a predetermined height (also referred to as the "storage height position"). When stored, the grounding turntable is rotated relative to the turntable support member to a predetermined rotational angle position around the vertical axis (also referred to as the "reference rotational angle position"). On the other hand, when the turntable is used, such as when loading or unloading a vehicle, the grounding turntable is used in a state where it is rotated relative to the turntable support member to a rotational angle position suitable for the ground conditions (e.g., the direction of inclination) to which it is to be placed. Thus, the grounding turntable is often rotated relative to the turntable support member during the process of storage and the process of placing the vehicle on the ground.

[0005] Conventionally, when rotating a grounding rotating plate relative to a rotating plate support member, a rotating rod for rotating the grounding rotating plate was engaged with the grounding rotating plate and the rotating rod was operated manually. However, a technology has also been proposed in which the grounding rotating plate is rotated by power using a drive device such as an electric motor (see, for example, Patent Document 1 below). [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 5635817 [Overview of the project] [Problems that the invention aims to solve]

[0007] By configuring the system to rotate the grounding plate using the power of the drive unit, it becomes easier to rotate the grounding plate compared to rotating it manually, thereby improving work efficiency. However, if the grounding plate is rotated by power without being lifted from the ground, there are safety concerns, such as the vehicle body unexpectedly moving or the drive unit being subjected to excessive load and damaged as the grounding plate rotates while in contact with the ground.

[0008] This invention has been made in view of these problems, and aims to provide a turntable for rail-road vehicles that can safely and easily rotate a grounding rotating plate. [Means for solving the problem]

[0009] To solve the above problems, the turntable for rail-road vehicles according to the present invention comprises: a turntable jack provided on the body of a rail-road vehicle capable of traveling on roads and railroad tracks, which is extendable and retractable vertically downward toward the body; a rotating plate support member provided at the lower end of the turntable jack (for example, an upper plate 131 constituting the rotating support table 130 in the embodiment); and a grounding rotating plate (for example, a lower plate 135 constituting the rotating support table 130 in the embodiment) provided at the lower part of the rotating plate support member so as to be rotatable around a vertical axis; the turntable jack is extended downward to ground the grounding rotating plate and lift the vehicle body off the ground, and the turning plate is rotated relative to the grounding rotating plate. board A turntable for a rail-road vehicle that enables the vehicle body to be turned by rotating the support member and the turntable jack, wherein the grounding rotating plate is in a non-grounded state, board The system comprises a rotary drive device (for example, a rotary drive motor 132 in the embodiment) capable of rotating the grounding rotating plate relative to a support member, and a rotary operation control device (for example, a control unit CU in the embodiment) that allows the rotary drive device to rotate the grounding rotating plate only when the extension / retraction amount of the turntable jack is such that the grounding rotating plate is not in contact with the ground.

[0010] In the rail-road vehicle turntable with the above configuration, it is preferable that the rotation operation control device allows the rotation of the grounding turntable by the rotation drive device when the grounding turntable is moved upward by the turntable jack and the grounding turntable is retracted.

[0011] In the rail-road vehicle turntable having the above configuration, it is preferable that the turntable has a rotation lock mechanism that restricts the rotation of the grounding turntable when the grounding turntable is retracted, and that when the grounding turntable is rotationally locked by the rotation lock mechanism, the rotation operation control device restricts the rotational operation of the grounding turntable by the rotation drive device. [Effects of the Invention]

[0012] According to the turntable for rail-road vehicles of the present invention, the rotational operation control device is configured to allow the rotational operation of the grounding rotating plate by the rotational drive device only when the extension and retraction amount of the turntable jack is such that the grounding rotating plate is not in contact with the ground. Therefore, it is possible to prevent situations in which the grounding rotating plate is rotated by the power of the rotational drive device while in contact with the ground. Consequently, it is possible to rotate the grounding rotating plate safely and easily during the process of storing the grounding rotating plate and the process of grounding it.

[0013] Furthermore, in the rail-road vehicle turntable with the above configuration, by configuring the rotational operation control device to allow the rotational operation of the turntable by the rotational drive device while the grounding turntable is moved upward by the turntable jack and the grounding turntable is stored, it is possible to more reliably prevent a situation in which the grounding turntable is rotated by the power of the rotational drive device while in contact with the ground.

[0014] Furthermore, in the rail-road vehicle turntable with the above configuration, if the grounding turntable is locked to rotate by a rotation lock mechanism that restricts the rotation of the grounding turntable when it is retracted, the rotation operation control device is configured to restrict the rotation operation of the grounding turntable by the rotation drive device. This prevents situations where the power of the rotation drive device acts on the grounding turntable while it is locked to rotate by the rotation lock mechanism, which could result in excessive load on the rotation drive device or damage to the rotation lock mechanism. [Brief explanation of the drawing]

[0015] [Figure 1] It is a side view showing the appearance of a rail-land working vehicle provided with a turntable device for a rail-land vehicle. [Figure 2] It is a perspective view from the rear of the vehicle body showing the schematic configuration of the turntable device for the rail-land vehicle. [Figure 3] It is a front view from the rear of the vehicle body showing the schematic configuration of the lower part of the turntable device for the rail-land vehicle. [Figure 4] It is a plan view showing one aspect of the rotational angle position of the lower plate with respect to the upper plate on the rotary support table of the turntable device for the rail-land vehicle. [Figure 5] It is a plan view showing another aspect of the rotational angle position of the lower plate with respect to the upper plate on the rotary support table. [Figure 6] It is a front cross-sectional view from the front of the vehicle body showing the schematic configuration of the rotation lock mechanism in the turntable device for the rail-land vehicle. [Figure 7] It is a front cross-sectional view from the front of the vehicle body showing the schematic configuration when the rotation lock mechanism is in the state of detecting upward movement of the lock pin. [Figure 8] It is a schematic view showing the schematic configuration of the turntable height position detector in the turntable device for the rail-land vehicle. [Figure 9] It is a schematic view showing the schematic configuration of the limit switch constituting the turntable height position detector. [Figure 10] It is a schematic view showing the state when the lower plate on the rotary support table is located at the first intermediate height position. [Figure 11] It is a schematic view showing the state when the lower plate on the rotary support table is located at the second intermediate height position. [Figure 12] It is a schematic view showing the positional relationship between the rotational center position of the lower plate and the iron wheel on the rotary support table. [Figure 13] It is a block diagram showing the control configuration of the turntable device for the rail-land vehicle. [Figure 14] It is a schematic view showing the first stage of the procedure for the wire laying operation of the rail-land working vehicle. [Figure 15] It is a schematic view showing the second stage of the procedure for the wire laying operation of the rail-land working vehicle. [Figure 16]This is a schematic diagram showing the third stage of the track installation procedure for the rail-road work vehicle described above. [Figure 17] This is a schematic diagram showing the fourth stage of the track installation procedure for the rail-road work vehicle described above. [Modes for carrying out the invention]

[0016] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows a side view of a rail-road work vehicle 1 equipped with a rail-road vehicle turntable according to the present invention. In Figure 1, the rail-road work vehicle 1 has a body 2 with a driver's cabin 4 at the front, and is based on a truck vehicle that can travel on roads with road-traveling wheels consisting of a pair of left and right tire wheels, which are steering wheels 3S, arranged at the front of the body 2, and a pair of left and right tire wheels, which are drive wheels 3D, arranged at the rear of the body 2. The body 2 has a body frame consisting of a chassis frame 5 and a subframe 6 mounted on the chassis frame 5. Here, although only the left steering wheel 3S and drive wheel 3D of the body 2 are shown in Figure 1, the same steering wheel 3S and drive wheel 3D are also provided on the right side of the body 2.

[0017] Work jacks 15 are provided behind the steering wheels 3S and behind the drive wheels 3D on the vehicle body 2. The work jacks 15 consist of an upper jack body 15a fixed to the vehicle body frame, a lower jack body 15b disposed within the upper jack body 15a so as to be movable downward, and a jack cylinder 16 provided inside the lower jack body 15b, connecting the upper jack body 15a and the lower jack body 15b. When this jack cylinder 16 is driven to extend and retract, the lower jack body 15b extends and retracts downward relative to the upper jack body 15a. The work jacks 15 are mainly used when the rail-road work vehicle 1 is performing work, and when the lower jack body 15b extends and retracts downward due to the extension and retraction drive of the jack cylinder 16, it lifts and supports the vehicle body 2, thereby providing stable support for the entire vehicle body 2. The vehicle is in the following state. On the rear side of the work jack 15 behind the steering wheel 3S, there is a front iron wheel 12F that is supported to swing up and down relative to the vehicle frame, and a front iron wheel swing cylinder 13F for swinging the front iron wheel 12F up and down between a stowed position (shown by a dashed line in the figure) and an extended position (shown by a solid line in the figure). Also, on the rear side of the work jack 15 behind the drive wheel 3D, there is a rear iron wheel 12R that is supported to swing up and down relative to the vehicle frame, and a rear iron wheel swing cylinder 13R for swinging the rear iron wheel 12R up and down between a stowed position (shown by a dashed line in the figure) and an extended position (shown by a solid line in the figure).

[0018] Here, the storage position described above refers to the position in which the front iron wheel 12F and rear iron wheel 12R are raised to a predetermined height above the road surface when the rail-road work vehicle 1 travels on a road or the like using the steering wheel 3S and drive wheel 3D (the position of the front iron wheel 12F and rear iron wheel 12R shown by the dashed line in Figure 1). The extended position described above refers to the position in which the front iron wheel 12F and rear iron wheel 12R are extended to a position in which the front iron wheel 12F and rear iron wheel 12R are located on the track, the steering wheel 3S and drive wheel 3D are located above the track 50, and the vehicle can travel on the track 50 using the front iron wheel 12F and rear iron wheel 12R.

[0019] Although Figure 1 only shows the front iron wheel 12F and rear iron wheel 12R on the left side of the vehicle body 2, the same front iron wheel 12F and rear iron wheel 12R are also provided on the right side of the vehicle body 2. Furthermore, although only the work jack 15, front iron wheel oscillating cylinder 13F, and rear iron wheel oscillating cylinder 13R provided on the left side of the vehicle body 2 are shown, the same work jack 15, front iron wheel oscillating cylinder 13F, and rear iron wheel oscillating cylinder 13R are also provided on the right side of the vehicle body 2.

[0020] A turntable 110 is provided at the lower center of the vehicle body 2. The turntable 110 consists of a turntable jack 120 provided at the lower part of the vehicle body 2 and capable of extending downwards, and a rotating support table 130 provided at the lower end of the turntable jack 120. The turntable 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 spaced apart from each other in the left-right direction (vehicle width direction). The left telescopic post 121L is configured to extend downwards in the vertical direction by the extension and retraction drive of a turntable extension cylinder 122L provided inside it. Similarly, the right telescopic post 121R is configured to extend downwards in the vertical direction by the extension and retraction drive of a turntable extension cylinder 122R provided inside it. The extension and retraction amounts of the left telescopic post 121L and the right telescopic post 121R can be adjusted to be the same, or they can be adjusted to be different. The turntable jack 120 is configured to extend and retract downwards in the vertical direction by the vertical movement of two telescopic posts 121L and 121R.

[0021] The rotating support table 130 is configured with an upper plate 131 horizontally provided at the lower end of the turntable jack 120 so as to connect the lower ends of two telescopic posts 121L and 121R, and a lower plate 135 horizontally provided below the upper plate 131 so as to be rotatable around a vertical axis. The turntable 110 makes it possible to change the direction of the vehicle body 2 by extending the turntable jack 120 downward to bring the lower plate 135 of the rotating support table 130 to the ground and lifting the vehicle body 2 off the ground, and by rotating the upper plate 131 and the turntable jack 120 relative to the lower plate 135. The turntable device 110 will be described in detail later.

[0022] An operating box 70 is provided at the left end of the subframe 6 in the middle of the vehicle body's longitudinal direction. This operating box 70 has operating devices for controlling the operation of the turntable 110 described above, and its details will be described later.

[0023] At the front of the mounting area (front of the subframe 6) behind the driver's cabin 4, there is a turntable 20 that is driven by a turntable motor 21 and is configured to rotate horizontally. A boom 30 is attached to a support column 22 extending upward from the turntable 20, with a foot pin 23 as the axis, so as to be able to swing (luff) up and down. The boom 30 is composed of a base boom 30a, an intermediate boom 30b, and a tip boom 30c, which are nested together and attached to the support column 22 by the foot pin 23 so as to be able to luff. A boom telescopic cylinder 31 is provided inside the boom 30, and the boom 30 can be extended and retracted in the longitudinal direction by the extension and retraction drive of this boom telescopic cylinder 31. A boom luffing cylinder 32 is mounted between the base boom 30a and the support column 22, and the boom 30 can be luffed in the vertical plane by the extension and retraction drive of this boom luffing cylinder 32.

[0024] A work platform support bracket 35 is attached to the tip of the boom 30c so as to be able to swing within the luffing surface of the boom 30. The work platform support bracket 35 is configured so that its upper surface is always kept horizontal regardless of the luffing angle of the boom 30, by the extension and retraction of a leveling cylinder 36 located inside it. 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 work platform 40. The work platform 40 is mounted on the upper surface of this work platform support bracket 35 so as to be able to rotate horizontally. A swivel motor 41 is provided inside the work platform support bracket 35, and by driving this swivel motor 41, the work platform 40 can be rotated horizontally (swivel operation) relative to the work platform support bracket 35. As described above, the upper surface of the work platform support bracket 35 is always kept horizontal, so that the floor surface of the work platform 40 is also kept horizontal regardless of the luffing angle of the boom 30. The work platform 40 is equipped with a work platform operation box 42 which has an operating device for controlling the drive of various hydraulic actuators such as a slewing motor 21, a boom extension cylinder 31, a boom luffing cylinder 32, and a swivel motor 41.

[0025] The rail-road work vehicle 1 configured as described above can retract its front iron wheels 12F and rear iron wheels 12R, and travel on roads and other surfaces using its steering wheels 3S and drive wheels 3D. It can also extend its front iron wheels 12F and rear iron wheels 12R onto the track and travel on the track. Thus, it is equipped with the aforementioned turntable 110 to switch between road travel and track travel.

[0026] As mentioned above, the turntable 110, as shown in Figure 2, is composed of a turntable jack 120 consisting of a left telescopic post 121L and a right telescopic post 121R, and a rotating support table 130 provided at the lower end of the turntable jack 120. The rotating support table 130 is composed of an upper plate 131 provided horizontally at the lower end of the turntable jack 120 so as to connect the lower ends of the left telescopic post 121L and the right telescopic post 121R, and a lower plate 135 provided horizontally and rotatably around a rotational axis O extending vertically below the upper plate 131 via a turntable bearing 134. The outer ring of the turntable bearing 134 is fixed to the upper surface of the lower plate 135, and a large-diameter rotating gear 136 is fixed to this outer ring. A rotary drive motor 132 is provided on the side of the upper plate 131, and a pinion gear 133 is attached to a drive shaft that protrudes downward from this rotary drive motor 132. This pinion gear 133 meshes with a rotary gear 136. Therefore, when the rotary drive motor 132 rotates the pinion gear 133, it transmits rotational driving force to the rotary gear 136 that meshes with it, thereby rotating the lower plate 135, to which the rotary gear 136 is attached, relative to the upper plate 131.

[0027] The left telescopic post 121L and the right telescopic post 121R have similar configurations, and here we will explain using the left telescopic post 121L as an example. The left telescopic post 121L consists of an outer post 123 fixed to the vehicle frame, an inner post 124 arranged to move up and down within the outer post 123, a turntable telescopic cylinder 122L (see Figure 3) located within the left telescopic post 121L, and a base plate fixed to the upper surface of the upper plate 131 of the rotating support table 130. The structure is composed of 125 and 124. The lower end of the turntable telescopic cylinder 122L is pin-connected to the base plate 125, and the inner post 124 is connected to the base plate 125 via this pin connection so as to be slightly pivotable. As a result, the rotation support table 130 is configured to tilt slightly relative to the left telescopic post 121L. The configuration of the right telescopic post 121R and the relationship between the right telescopic post 121R and the rotation support table 130 are the same as described above, so no further explanation is provided.

[0028] As described above, in the rotating support table 130, the lower plate 135 is rotatable around the rotation center axis O relative to the upper plate 131. Specifically, as shown in Figure 4, the lower plate 135 can be rotated 360° around the rotation center axis O to any rotation angle position, with the rotation angle position where its short side extends in the front-rear direction (the direction of the front-rear axis A1 extending front-rear through the rotation center axis O) and its long side extends in the left-right direction (the direction of the left-right axis A2 extending in the vehicle width direction through the rotation center axis O) being used as the reference rotation angle position. The lower plate 135 has a shape that is 180° rotationally symmetric in a plan view. When the lower plate 135, which is in the reference rotation angle position, is rotated 90° clockwise or counterclockwise around the rotation center axis O, the lower plate 135 moves to a rotation angle position (also called the "right-angle rotation angle position") in which its longitudinal direction extends in the front-to-back direction (direction of the front-to-back axis A1) and its short direction extends in the left-to-right direction (direction of the left-to-right axis A2), as shown in Figure 5.

[0029] As shown in Figure 2, the turntable 110 is equipped with a rotation lock mechanism 140 that restricts the rotation of the lower plate 135 at the reference rotation angle position. As shown in Figure 6, the rotation lock mechanism 140 comprises a vertically extending cylindrical lock pin support 142 fixed to the side surface of the outer post 123 of the right telescopic post 121R via a mounting bracket 141, and a vertically extending cylindrical lock pin 143 inserted and held within the lock pin support 142. Two vertically extending guide holes 142a are formed at two positions on the upper end side surface of the lock pin support 142, and guide pins 143a are provided at two positions on the side surface of the lock pin 143, protruding outward through the guide holes 142a formed on the side surface of the lock pin support 142. Furthermore, outwardly extending spring-loaded pins 142b are formed at two positions on the lower side surface of the lock pin support 142, and a biasing spring 144 is stretched between these spring-loaded pins 142b and the guide pin 143a of the lock pin 143 to bias the lock pin 143 downward. A rotating roller 145 is rotatably attached to the lower end of the lock pin 143, and two stopper pins 143c protruding laterally are provided at the upper end of the lock pin 143. The mounting bracket 141 is provided with a stopper base 141a that can support the lock pin 143 by contacting the stopper pins 143c of the lock pin 143 from below. The mounting bracket 141 is also provided with a lock operation detector 146. This lock operation detector 146 is composed of a rotary lever type limit switch, and the tip of the rotary lever 146a is positioned above the lock pin 143.

[0030] A lock pin insertion hole 131a is formed in the upper plate 131 of the rotary support table 130, and the lock pin 143 of the rotary lock mechanism 140 can protrude downward from this lock pin insertion hole 131a. On the other hand, a lock pin insertion hole 135a is formed in the lower plate 135 of the rotary support table 130, which is positioned opposite to the lock pin insertion hole 131a of the upper plate 131 when the lower plate 135 is in the reference rotation angle position, and has a smaller diameter than the lock pin insertion hole 131a. As shown in Figures 4 and 5, this lock pin insertion hole 135a is formed at two positions (positions symmetrical with respect to the rotation axis O) on a circular path CP that is virtually set on the upper surface of the lower plate 135 in a plan view, with the rotation axis O as the center. This circular path CP has a radius equal to the distance from the rotation axis O to the center of the lock pin insertion hole 131a in a plan view.

[0031] In the rotation lock mechanism 140 configured as described above, the lock pin 143, which is biased downward by the biasing spring 144 and supported by the stopper base 141a, protrudes downward from the lock pin insertion hole 131a of the upper plate 131, as shown in Figure 6. Furthermore, the lower end of the lock pin 143 (rotating roller 145) is fitted into the lock pin insertion hole 135a of the lower plate 135, thereby enabling the rotation lock of the lower plate 135. This rotation lock state occurs, for example, when the rotation support table 130, with the lower plate 135 in the reference rotation angle position, rises due to the upward contraction of the turntable jack 120. This rise of the rotation support table 130 causes the lower plate 135 to rise to a height position (also referred to as the "storage height position") where the lower end of the lock pin 143 is fitted into the lock pin insertion hole 135a of the lower plate 135, thus resulting in the rotation lock state.

[0032] On the other hand, when the rotation support table 130 is raised while the lower plate 135 is not in the reference rotation angle position, the upper surface of the lower plate 135 comes into contact with the rotating roller 145 of the lock pin 143 from below as it moves to the storage height position, causing the lock pin 143 to move upward against the biasing force of the biasing spring 144. In this state, when the lower plate 135 is rotated around the rotation center axis O, the rotating roller 145 of the lock pin 143, which is biased downward by the biasing spring 144, rolls along the circular path CP while being pressed against the upper surface of the lower plate 135. Then, when the lower plate 135 is rotated to the reference rotation angle position, the rotating roller 145 of the lock pin 143 automatically fits into the lock pin insertion hole 135a of the lower plate 135 formed on the circular path CP, thereby locking the rotation. When the lock pin 143 moves upward by a predetermined distance, the upper end of the lock pin 143 contacts the tip of the rotating lever 146a of the lock operation detector 146 from below, causing the rotating lever 146a to swing upward. This causes the lock operation detector 146 to output an ON signal (also referred to as the "lock operation detection signal"). Figure 7 shows the state when the lock pin 143 moves upward, pushed up by the lower plate 135, and the upper end of the lock pin 143 contacts the tip of the rotating lever 146a, causing the rotating lever 146a to swing upward (also referred to as the "lock pin upward movement detection state"). Note that the rotation lock mechanism 140 is greatly simplified in Figure 7. This is also true for Figures 10 to 11, which will be described later. When the rotating lever 146a of the lock operation detector 146 is not swinging upward, the lock operation detector 146 outputs an OFF signal.

[0033] The rotation lock of the lower plate 135 by the rotation lock mechanism 140 can be automatically released by extending the turntable jack 120 downward and lowering the rotation support table 130. Specifically, as the rotation support table 130 is lowered, the lower plate 135 moves downward, causing the rotating roller 145 of the lock pin 143 to disengage from the lock pin insertion hole 135a of the lower plate 135, thereby automatically releasing the rotation lock of the lower plate 135.

[0034] As shown in Figure 8, the turntable device 110 is equipped with a turntable height position detector 111, which has three rotary lever type limit switches 112A, 112B, and 112C. This turntable height position detector 111 detects the height position of the rotary support table 130 (lower plate 135), which moves vertically according to the extension and retraction amount of the turntable jack 120. The three limit switches 112A, 112B, and 112C are mounted on the side of the outer post 123 of the left telescopic post 121L or the right telescopic post 121R, but in Figure 8, the outer post 123 is not shown, and the positional relationship between the inner post 124 and the three limit switches 112A, 112B, and 112C is shown.

[0035] Since the configurations of the three limit switches 112A, 112B, and 112C are the same, we will explain using limit switch 112A as an example. A lever insertion hole 123a is formed on the side of the outer post 123 through which the rotating lever 113 of limit switch 112A can be inserted, and the rotating lever 113 is positioned so that its tip (roller portion) protrudes from the lever insertion hole 123a toward the side of the inner post 124. A lever engagement hole 124a is formed on the side of the to 124, which can engage with the tip of the rotating lever 113 in accordance with the vertical movement of the inner post 124 relative to the outer post 123. The rotating lever 113 is configured to swing between a position where its tip protrudes from the lever engagement hole 124a into the interior of the inner post 124 (as shown in Figure 9) (also referred to as the "reference position") and a position where its tip emerges from the lever engagement hole 124a and rests on the side of the inner post 124. The limit switch 112A outputs an ON signal when the rotating lever 113 is in the reference position and an OFF signal when the rotating lever 113 swings by a predetermined angle from the reference position.

[0036] As shown in Figure 8, the limit switch 112B is positioned so that the tip (roller portion) of its rotating lever 113 can engage with a lever engagement hole 124b formed on the side surface of the inner post 124, separate from the lever engagement hole 124a, in accordance with the vertical movement of the inner post 124. Similarly, the limit switch 112C is positioned so that the tip (roller portion) of its rotating lever 113 can engage with the lever engagement hole 124b at a different timing than that of the limit switch 112B, in accordance with the vertical movement of the inner post 124. The turntable height position detector 111 can detect the height position of the lower plate 135 of the rotating support table 130 based on the state of the output signals from the three limit switches 112A, 112B, and 112C. Specifically, if the output signals from limit switches 112A and 112B are both ON signals and the output signal from limit switch 112C is OFF, it indicates that the lower plate 135 of the rotary support table 130 is in the stored height position (as shown in Figure 6). Also, if the output signal from limit switch 112B is ON and the output signals from limit switches 112A and 112C are both OFF signals, it indicates that the lower plate 135 of the rotary support table 130 is in a height position between the stored height position and the first intermediate height position. The first intermediate height position is set as a boundary position where, if the lower plate 135 is located at or below the first intermediate height position, the rotation lock mechanism 140 will not activate the rotation lock of the lower plate 135. For example, this is the height position of the lower plate 135 in the state shown in Figure 10.

[0037] Furthermore, if the output signals from limit switches 112A and 112B are both off signals, and the output signal from limit switch 112C is on, it indicates that the lower plate 135 of the rotary support table 130 is located at a height between the first intermediate storage height position and the second intermediate storage height position. The second intermediate storage height position is set as a boundary position where, if the lower plate 135 is rotated while it is located at a height lower than the second intermediate storage height position, there is a possibility that the lower plate 135 will come into contact with the ground. For example, this is the height position of the lower plate 135 as shown in Figure 11. Also, if the output signals from limit switches 112A, 112B, and 112C are all off signals, it indicates that the lower plate 135 of the rotary support table 130 is located at a height lower than the second intermediate storage height position (including the state in which the lower plate 135 is in contact with the ground).

[0038] In the turntable 110, the turntable jack 120 can be extended downward to bring the lower plate 135 of the rotating support table 130 into contact with the ground, thereby lifting and supporting the vehicle body 2. With the vehicle body 2 in this lifted and supported state, the direction of the vehicle body 2 can be changed by rotating the upper plate 131 and the turntable jack 120 relative to the lower plate 135, allowing for track loading and unloading operations. This direction change is performed by the operator pushing the vehicle body while it is lifted and supported by the turntable 110, causing the upper plate 131 and the turntable jack 120 to rotate relative to the lower plate 135.

[0039] The turntable 110 is located at the lower center of the vehicle body 2, and the vertically extending rotation axis O, which serves as the rotation center of the lower plate 135 relative to the upper plate 131, is positioned at the center of gravity of the rail-road work vehicle 1. Furthermore, the pair of left and right front steel wheels 12F, 12F are in the width direction of the vehicle body. The front and rear iron wheels 12R, 12R are positioned symmetrically on both sides, and the pair of rear iron wheels 12R, 12R are also positioned symmetrically on both sides in the width direction of the vehicle body. That is, as shown in Figure 12, the pair of front iron wheels 12F, 12F and the pair of rear iron wheels 12R, 12R are positioned symmetrically on both sides with respect to the front and rear axle A1 that extends forward and backward through the rotation center axis O. In addition, the front iron wheel axle A3 connecting the pair of front iron wheels 12F, 12F and the rear iron wheel axle A4 connecting the pair of rear iron wheels 12R, 12R are parallel to the left and right axle A2 that extends in the width direction through the rotation center axis O. Note that in Figure 12, the rail-road work vehicle 1 is shown in a simplified external shape, and only the components necessary for explanation are schematically shown so that their positional relationships can be seen. For example, for the turntable 110, only the lower plate 135 is shown, and the shape of the lower plate 135 is also simplified and shown as a rectangle.

[0040] In the turntable 110, as described above, the turntable jacks 120 are extended downward to extend the rotating support table 130 downward to support the vehicle body and perform track loading and unloading operations. However, when traveling on the road or track, the turntable jacks 120 are retracted upward to move the rotating support table 130 upward for storage and retention. When extending the rotating support table 130 downward or moving it upward for storage and retention, the lower plate 135 of the rotating support table 130 is rotated around the rotation center axis O, and the lower plate 135 is rotated to a predetermined rotation angle position. For example, when performing track loading and unloading operations, the lower plate 135 is rotated to a rotation angle position where its longitudinal direction is perpendicular to the direction in which the track extends, and its short direction is parallel to the direction in which the track extends. Furthermore, when storing and holding the rotary support table 130, the lower plate 135 is rotated and held to a reference rotation angle position where the longitudinal direction of the lower plate 135 extends in the left-right direction (direction of the left-right axis A2) and the short direction extends in the front-back direction (direction of the front-back axis A1).

[0041] Next, the operation control of the extension and retraction of the turntable jack 120 and the rotation of the lower plate 135 of the rotation support table 130 in the turntable device 110 will be explained with additional reference to Figure 13. The operation box 70 shown in Figure 1 is equipped with a turntable rotation operation device 71 and a turntable lifting operation device 72. These operation devices are equipped with operating tools such as operating levers and operating dials, and when these tools are operated, they output an operation signal to the control unit CU according to the direction and amount of operation. The control unit CU controls the drive of the rotation drive motor 132 in accordance with the operation signal output from the turntable rotation operation device 71 to control the rotation of the lower plate 135 of the rotation support table 130. The control unit CU also controls the drive of the turntable extension and retraction cylinders 122L and 122R in accordance with the operation signal output from the turntable lifting operation device 72 to control the extension and retraction of the turntable jack 120.

[0042] The turntable extension cylinders 122L and 122R are hydraulically driven, and electromagnetic proportional control valves corresponding to the turntable extension cylinders 122L and 122R are installed in the hydraulic valve unit VU. The hydraulic valve unit VU is supplied with hydraulic fluid from the hydraulic fluid tank T by a hydraulic pump P, which is driven by the driving force transmitted from the engine E for vehicle propulsion via the power take-off mechanism PTO. The control unit CU controls the drive of the turntable extension cylinders 122L and 122R by controlling the drive of the electromagnetic proportional control valves corresponding to the turntable extension cylinders 122L and 122R.

[0043] Furthermore, the control unit CU receives output signals from the turntable height position detector 111 (limit switches 112A, 112B, 112C) and the lock operation detector 146 as they occur. The control unit CU receives an output signal from the turntable height position detector 111 indicating that the lower plate 135 is located at a height between the first intermediate height position and the second intermediate height position (when the output signals from limit switches 112A and 112B are both off signals and the output signal from limit switch 112C is an on signal). In the case of ( ), the control unit CU allows the rotation drive motor 132 to be driven. That is, the control unit CU drives the rotation drive motor 132 to rotate the lower plate 135 in response to the operation signal output from the turntable rotation operation device 71. On the other hand, if the output signal from the turntable height position detector 111 indicates that the lower plate 135 is located at a height position different from the height position between the first intermediate height position and the second intermediate height position, the control unit CU restricts the driving of the rotation drive motor 132. That is, even if the control unit CU receives an operation signal from the turntable rotation operation device 71, it does not respond to it by not driving the rotation drive motor 132 and does not rotate the lower plate 135.

[0044] However, the control unit CU allows the rotary drive motor 132 to be driven if the output signal from the turntable height position detector 111 indicates that the lower plate 135 is located at a height between the stowed height position and the first intermediate height position (when the output signal from limit switch 112B is an ON signal and the output signals from limit switches 112A and 112C are both OFF signals), and the output signal from the lock operation detector 146 is an ON signal (lock operation detection signal). In other words, in this case, the control unit CU drives the rotary drive motor 132 to rotate the lower plate 135 in response to the operation signal output from the turntable rotation operation device 71. This situation occurs when the rotation support table 130 rises while the lower plate 135 is not in the reference rotation angle position, the upper surface of the lower plate 135 contacts the rotating roller 145 of the lock pin 143 from below, moving the lock pin 143 upward against the biasing force of the biasing spring 144, and the upper end of the lock pin 143 contacts the tip of the rotating lever 146a of the lock operation detector 146 from below, causing the rotating lever 146a to swing upward. In this case, when the rotation drive motor 132 is driven to rotate the lower plate 135, as described above, the lower plate 135 is rotated and locked by the rotation lock mechanism 140 when the lower plate 135 rotates to the reference rotation angle position.

[0045] Next, the operation of switching between road travel and track travel using the turntable 110 (track loading and track unloading operations) will be explained with additional reference to Figures 14 to 17. In these figures, the rail-road work vehicle 1 is shown in a simplified form, and only the components necessary for the explanation are schematically shown so that their positional relationships can be understood. For the turntable 110, only the lower plate 135 is shown, and the shape of the lower plate 135 is also simplified and shown as a rectangle.

[0046] When performing track installation work, first, as shown in Figure 14, the rail-road work vehicle 1 is brought into the level crossing and stopped. At this time, it is necessary to move the rail-road work vehicle 1 so that the rotation center axis O of the lower plate 135 in the turntable 110 is located at the center of the rails R,R. This is because, as mentioned above, the left and right pairs of front iron wheels 12F, 12F and the left and right pairs of rear iron wheels 12R, 12R are positioned symmetrically with respect to the front and rear axis A1 that extends forward and backward through the rotation center axis O (see Figure 12). Figure 14 shows the state in which the rotation center axis O of the lower plate 135 is located at the center of the rails R,R. At this time, the lower plate 135 is located at a reference rotation angle position in which its longitudinal direction extends in the left-right direction (direction of the left-right axis A2) and its short direction extends in the front-rear direction (direction of the front-rear axis A1) at the storage height position, and is stored and held in a rotationally locked state by the rotation lock mechanism 140.

[0047] Next, the worker performing the track installation operates the turntable lifting and lowering device 72 in the control box 70 to extend the turntable jack 120 downward, moving the rotating support table 130 downward and stopping it so that the lower plate 135 is positioned at a height between the first intermediate height position and the second intermediate height position. The worker may also be notified by sound or light when the lower plate 135 is positioned at a height between the first and second intermediate height positions. Then, the worker operates the turntable rotation device 71 in the control box 70 to activate the rotation drive motor 132, rotating the lower plate 135 to a rotation angle position where its longitudinal direction is perpendicular to the direction in which the rails R,R extend. From this position, the worker operates the turntable lifting and lowering device 72. The turntable jack 120 is extended further downward to move the rotation support table 130 downward, the lower plate 135 is brought to the ground, and the turntable 110 lifts and supports the vehicle body 2.

[0048] Next, the worker pushes the vehicle body 2, which is lifted and supported by the turntable 110, to rotate the upper plate 131 and the vehicle body 2 of the rail-road work vehicle 1 connected thereto relative to the lower plate 135. This rotation of the vehicle body 2 positions the left and right pair of front iron wheels 12F, 12F and the left and right pair of rear iron wheels 12R, 12R directly above the rails R, R. If the rotation axis O of the lower plate 135 is located in the center of the rails R, R, the turntable 110 can lift and support the vehicle body 2, and by rotating the vehicle body 2 of the rail-road work vehicle 1 around the rotation axis O relative to the lower plate 135, the left and right pair of front iron wheels 12F, 12F and the left and right pair of rear iron wheels 12R, 12R can be positioned directly above the rails R, R.

[0049] Next, the track-laying worker extends the steel wheels and then operates the turntable lifting device 72 to retract the turntable jacks 120 upward, raising the rotation support table 130 (upper plate 131 and lower plate 135). This releases the lifting support of the vehicle body 2 by the turntable device 110, and the pair of front steel wheels 12F, 12F and the pair of rear steel wheels 12R, 12R are placed on the rails R, R, as shown in Figure 1. If the lower plate 135 is in the reference rotation angle position at this time (if the lower plate 135 has returned to the reference rotation angle position due to the rotation of the vehicle body 2), the tip of the lock pin 143 in the rotation lock mechanism 140 (rotating roller 145) will fit into the lock pin insertion hole 135a of the lower plate 135 as the rotation support table 130 is raised, locking the rotation. Therefore, there is no need to rotate the lower plate 135, and the track-laying work is completed.

[0050] On the other hand, if the lower plate 135 is not in the reference rotation angle position, as the rotation support table 130 is raised, the upper surface of the lower plate 135 comes into contact with the rotating roller 145 of the lock pin 143 from below, causing the lock pin 143 to move upward against the biasing force of the biasing spring 144. When the upper end of the lock pin 143 moves upward, it comes into contact with the tip of the rotating lever 146a of the lock operation detector 146 from below, causing the rotating lever 146a to swing upward, and a lock operation detection signal is output from the lock operation detector 146. In this case, the operator operates the turntable rotation operation device 71 to activate the rotation drive motor 132 and rotate the lower plate 135 to the reference rotation angle position. When the lower plate 135 is rotated to the reference rotation angle position, the tip of the lock pin 143 (rotating roller 145) automatically fits into the lock pin insertion hole 135a of the lower plate 135, locking the lower plate 135 in rotation, thus completing the cable installation work. Alternatively, when a lock operation detection signal is output from the lock operation detector 146, the operator may be prompted to rotate the lower plate 135 using sound, light, or other means.

[0051] The above describes the on-track operation, in which the rail-road work vehicle 1, which has traveled along the road to the level crossing, is transferred to the rails R,R within the level crossing. However, by performing the reverse operation within the level crossing, the rail-road work vehicle 1 can be transferred from the rails R,R to the road.

[0052] In the above embodiment, a rotation lock mechanism 140 is provided that can automatically lock the rotation of the lower plate 135 at the storage height position. However, a configuration without such a rotation lock mechanism is also possible. In that case, the rotation of the lower plate 135 by the rotation drive motor 132 is permitted only when the extension / retraction amount of the turntable jack 120 is such that the lower plate 135 is not in contact with the ground. For example, the control unit CU can be configured to permit the rotation of the lower plate 135 only when the lower plate 135 is at a height position where it will not touch the ground (or there is no risk of it touching the ground) even if it is rotated (for example, a height position between the storage height position and the second intermediate height position in the above embodiment), and to restrict the rotation of the lower plate 135 when the lower plate 135 is at any other height position.

[0053] In the embodiments described above, a rail-road vehicle equipped with a work device for working at heights was used as an example of a rail-road vehicle to which the present invention is applied. However, the present invention is not limited to this, and can be applied to rail-road vehicles equipped with, for example, a crane or other various work devices, as well as to rail-road vehicles for transporting materials that are not equipped with work devices. [Explanation of symbols]

[0054] 1. Rail-road work vehicle 2 car bodies 3S Steering Wheel 3D drive wheels 12F Front Iron Wheel 12R Rear Iron Wheel 70 Control Box 110 Turntable 120 Turntable Jack 121L Left-extending post 121R Right-hand telescopic post 130 Rotating Support Table 131 Top plate 132 Rotary drive motor 135 Lower plate 140 rotation locking mechanism 142 Lock pin support 143 Lock Pins 144. Biasing spring 146 Locking Detector CU Control Unit

Claims

1. A turntable for a rail-road vehicle, capable of traveling on roads and railway tracks, comprising: a turntable jack provided on the vehicle body and extending and retracting vertically downward toward the vehicle body; a rotating plate support member provided at the lower end of the turntable jack; and a grounding rotating plate provided at the lower part of the rotating plate support member so as to be rotatable around a vertical axis, wherein the turntable device allows the vehicle body to be lifted off the ground by extending the turntable jack downward to ground the grounding rotating plate, and the direction of the vehicle body to be changed by rotating the rotating plate support member and the turntable jack relative to the grounding rotating plate, A rotary drive device capable of rotating the grounding rotating plate relative to the rotating plate support member when the grounding rotating plate is not grounded, A turntable for rail-road vehicles, characterized by comprising: a rotational operation control device that allows the rotational operation of the grounding rotating plate by the rotational drive device only when the extension and retraction amount of the turntable jack is such that the grounding rotating plate is not in contact with the ground.

2. The turntable for rail-road vehicles according to claim 1, characterized in that, when the grounding rotating plate is moved upward by the turntable jack and the grounding rotating plate is retracted, the rotation operation control device allows the rotation operation of the grounding rotating plate by the rotation drive device.

3. The rotating grounding plate is provided with a rotation lock mechanism that restricts the rotation of the rotating grounding plate when it is retracted. The turntable for rail-road vehicles according to claim 2, characterized in that when the grounding rotating plate is locked to rotate by the rotation lock mechanism, the rotation operation control device restricts the rotation operation of the grounding rotating plate by the rotation drive device.

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