JP2002120531A - Work vehicle for track - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle for tracks securely capable of preventing a boom from getting in contact with stringing when the work vehicle is on tracks. SOLUTION: This work vehicle for tracks is provided with a lower structure provided with wheels (or crawlers) for traveling on land, and track wheels, an upper structure provided with a telescopic boom, and track traveling changing devices 17, 2g, and 2j to place the track wheels on the tracks for a change into a track traveling attitude for traveling on the tracks. It is also provided with a boom attitude determining part 32a to determine if the telescopic boom gets in contact with the stringing in the track traveling attitude before it is changed into the track traveling attitude, and a traveling changing control part 32b to execute track traveling side changing action by the track traveling changing devices when it is determined that the telescopic boom does not get in contact with the stringing, and prohibit the track traveling side changing action when it is determined that it gets in contact with the stringing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track working machine used for repairing, for example, railroad tracks and associated facilities.

[0002]

2. Description of the Related Art Conventionally, there has been known a track working machine in which wheels for track running are added based on a self-propelled crane so as to be able to run on land and on tracks.

[0003] When repairing a railway track, for example, using this type of track working machine, the train is first run on land, enters the railroad from the nearest railroad crossing at the work site, and is arranged before and after the lower traveling body. A track running wheel (hereinafter, referred to as a track ring) is placed on a track while a crawler (or wheel) for land running is levitated, thereby enabling track running.

[0004] At this time, if the boom occurs and the crane is in the working posture, there is a risk that the boom may come into contact with the high-voltage overhead line when the track ring is lowered to lift the crawler. The distance from the track to the overhead wire is usually about 4.5 m, and the total height of the track working machine is about 3 m. However, the total height of the track working machine when traveling on the track increases to about 3.5 m. Therefore, when the boom does not exceed the body height, there is a margin of about 1.0 m between the boom and the overhead line. However, when the boom is raised beyond the body height, there is a risk of touching the overhead line.

[0005]

Accordingly, the operator must be careful not to touch the overhead wire while imagining the boom posture when the body height is increased when the track work machine is in the track running posture. I have to pay.
However, it is not possible to completely prevent an overhead line contact accident by relying solely on the judgment of the operator. Therefore, there is a demand for a safety measure to prevent the boom from coming into contact with the overhead line even if an operation error occurs. .

In this type of track working machine, when traveling short distances while performing crane work, a crawler may run on a sleeper while straddling a track.
However, since signal cables and the like are laid near the tracks, safety measures are required so as not to damage not only the above-mentioned overhead lines but also ground equipment such as signal cables.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems in the conventional track working machine, and a first object is to make sure that the boom comes into contact with the overhead line when performing track running. A second object of the present invention is to provide a track working machine which can prevent the ground equipment installed along the track from being damaged when traveling on land. Is to do.

[0008]

SUMMARY OF THE INVENTION A track working machine according to the present invention has the following features: (a) when the working apparatus is likely to come into contact with an overhead line when the track running posture is set, the lowering of the bearing ring is prohibited. (Corresponding to claim 1), (b) a device that deactivates the working device when the bearing ring is lowered (corresponding to claim 2), and (c) a bearing lowering operation in a working posture. In the case of (1), a track ring is placed on the track so that the track can be run on land using the track as a guide (corresponding to claim 6).

According to a first aspect of the present invention, there is provided a lower traveling body having wheels or crawlers for land traveling and a track ring for traveling on a track, an upper revolving superstructure on which a working device is mounted, and A track working device having a track running switching device that switches to a track running position by lifting wheels or crawlers from the ground while placing wheels on the track, wherein the working device is in the track running position before being switched to the track running position. Judgment means for judging whether or not contact is made with the overhead line, and when the judgment means judges that it does not come into contact with the overhead line, the track running side switching operation is performed by the track running switching device, and when it is determined that the contact is made with the overhead line, track running is performed. And a traveling switching control means for inhibiting a track traveling side switching operation by the switching device.

According to a second aspect of the present invention, there is provided a track working machine having the above configuration, wherein a track running detecting means for detecting that a track running switching device is switched to a track running side, and a track running detecting means provided by the track running detecting means. A work device locking means for disabling the work device when the traveling-side switching operation is detected is provided.

In each of the above inventions, the gist of the present invention is that the working device comprises a crane device constituted by a boom that can be raised and lowered and that can expand and contract.

Further, the determination means may be configured to determine a boom posture based on a boom angle and a boom length obtained from a boom angle sensor and a boom length meter, and determine whether or not the boom position comes into contact with an overhead wire. it can.

Further, the determination means may be configured to determine the boom posture and determine whether or not the hook contacts the overhead wire based on the storage state of the hook detected by the hook storage state detection means.

According to a sixth aspect of the present invention, there is provided a lower traveling body having wheels or crawlers for land traveling and a track ring for traveling on a track, an upper revolving superstructure on which a working device is mounted, and A track working machine equipped with a track running switching device that switches to a track running position by lifting the wheels or crawlers from the ground while placing the wheels on the track, a cylinder for lowering the track ring on the track, and a track running attitude Signal output means for outputting a signal when not
When the bearing ring lowering operation is performed, the bearing ring is lowered to the track based on the output of the signal, but the cylinder control means for controlling the cylinder so that the track working machine is not lifted by the lowering of the bearing ring. The gist is to be prepared.

According to the present invention, the signal output means may be constituted by an operating body for manually outputting a signal, and the signal output means may be controlled by a boom angle sensor and a boom length meter. Based on this, it may be configured to automatically determine that it is not the track running posture.

A specific example of the cylinder control means is a pressure control valve for reducing a supply pressure supplied to a head side oil chamber of the cylinder.

According to the first aspect of the present invention, before switching to the orbital running posture, the determining means determines whether or not the working device contacts the overhead line, and if it is determined that the working device does not contact the overhead line, The track running side switching operation by the track running switching device is permitted, and when it is determined that the track running side switching device contacts the overhead line, the track running side switching operation is prohibited.

According to the second aspect of the present invention, when the track running detecting means detects that the track running switching device has been switched to the track running side, the working device locking means sets the working device in a non-operating state. For locking, operation of the working device is prohibited after the bearing ring is placed on the track.

In the case where the working device is a crane device constituted by a telescopic boom, it is possible to prevent an accident that the telescopic boom comes into contact with the overhead line because the telescopic boom is not reduced to the minimum.

The determining means determines a boom posture based on the boom angle and the boom length obtained from the existing boom angle sensor and the boom length meter of the crane, and determines the boom posture based on the positional relationship between the calculated boom posture and the overhead wire. Thus, it can be determined whether or not the crane contacts the overhead wire, and the presence or absence of contact with the overhead wire can be determined using an existing sensor or the like for the crane. Also, if the hook storage state detecting means determines whether or not the hook is stored, it can be more accurately confirmed that the crane operation is not performed.

According to the sixth aspect of the present invention, if the track ring is lowered while the wheels or the crawlers of the track working machine are in contact with the track, the track ring is placed on the track. The cylinder is controlled so that the track work machine cannot be lifted. In this state, since the inner flange of the race is engaged with the race, the race rotates with the race as a guide when traveling on land. Thereby, the track working machine can travel along the track without deviating from the track. As a result, it is possible to move safely without damaging equipment such as signal cables laid near the track.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1 to 4 show a first embodiment, FIGS. 1 and 5 show a second embodiment, and FIGS. 6 and 7 show a third embodiment.

FIG. 1 shows the overall construction of a track working machine according to the present invention, wherein (a) is a front view of the track working machine as viewed from the front, and (b) is a right side view thereof. It is.

In both figures, the track working machine 1 includes a lower traveling body 2 equipped with a crawler 2a and a lower traveling body 2
The upper turning body 3 is provided with a cabin 3a on the front left side thereof, and an engine room 3b in which the main engine M is stored is formed at the rear thereof. .

The front part of the upper turning body 3 and the cabin 3
A multi-stage telescopic boom (working device) 4 is provided on the side of a. In this telescopic boom 4, a plurality of stages of inner cylinders 4b to 4d are nested in an outermost cylinder 4a,
A boom head 4e is provided at the tip of the innermost cylinder 4d, and a hook 4f is attached to the boom head 4e. Reference numeral 4g denotes an up / down cylinder for raising and lowering the telescopic boom 4.

The crawler 2a of the undercarriage 2 is
The orbiter travels between a driving sprocket 2b and an idler 2c driven by a traveling hydraulic motor for land traveling.

A front arm of the lower traveling body 2 is provided with parallel arms 2e, 2e which swing vertically, and front ends of the parallel arms 2e, 2e are respectively provided with front wheels for track running (hereinafter referred to as front track wheels). 2f, 2f). In this configuration, when the arm lifting cylinder 2g is extended, the parallel arms 2e, 2e rotate downward with the front end of the traveling frame as a fulcrum, and the front races 2f, 2f can be placed on the track.

On the other hand, parallel arms 2h, 2h, rear races 2i, 2i, and an arm elevating cylinder 2j are similarly provided at the rear of the lower traveling body 2.

Accordingly, the track working machine 1 is positioned so that the front race 2f and the rear race 2i are along the race 6, and
When the arm lifting / lowering cylinders 2g and 2j are extended, the front races 2f, 2f and the rear races 2i, 2i are respectively lowered and placed on the races 6, 6. When the extension operation of each of the cylinders 2g and 2j is further continued, the land track rubber crawler 2a floats from the ground, and in this state, the track working machine 1 can move on the tracks 6, 6 (in the figure). (See the front and rear ring positions indicated by the two-dot chain line.)

The parallel arms 2h, 2h and the arm lifting / lowering cylinders 2g and 2j function as a track running switching device. The front raceway ring 2f and the rear raceway ring 2i are driven by a track traveling hydraulic motors 2m and 2n attached to the parallel arms 2e and 2h as drive sources via belts.

FIG. 2 shows a hydraulic circuit mounted on the track working machine 1.

In the figure, a first hydraulic pump 10, a variable displacement type second hydraulic pump 11 and a pilot pump 12
Is driven by an engine 13, and hydraulic oil discharged from the first hydraulic pump 10 is supplied to a swing motor 15 via a swing motor control valve 14.

A part of the hydraulic oil discharged from the second hydraulic pump 11 is supplied to a track / land traveling switching valve 16. The track / land travel switching valve 16 has a track traveling side and a land traveling side switching position a, b, and a track / land traveling switching switch 16a.
Is closed, it is switched to the track running side A, and the arm lift cylinders 2g and 2j for placing the track rings 2f and 2i on the track 6 can be expanded and contracted via the track ring lift control valve 17. Further, the track running motors 2m and 2n can be driven via a track running motor control valve 18 provided on the downstream side of the track ring lifting control valve 17.

On the other hand, the track / land running switch 16a
Is opened, it is switched to the land traveling side A, and the land right traveling motor 20 can be driven via the traveling motor control valve 19 and the land left traveling motor 22 can be driven via the traveling motor control valve 21, respectively.

The oil passage 2 branched from the oil passage 23 leading from the second hydraulic pump 11 to the track / land switching solenoid valve 16.
4 is a control valve 26 for a winch motor 25, a control valve 27 for a boom hoist cylinder 4g, and a boom telescopic cylinder 2
8 communicates with each center bypass of the control valve 29.

Each of the control valves 14, 26, 27, 29 described above
The first remote control valve 3 of the operating lever
0 and a remote control pressure derived from the second remote control valve 31 are provided.
Are connected to the pilot ports of the control valves, respectively.

During running on the track, all of the working devices including the boom hoist cylinder 4g are not operated, and thus all of these control valves 14, 26, 27 and 29 are at the center bypass position. Therefore, the entire amount of hydraulic oil discharged from the second hydraulic pump 11 is given to the raceway elevating control valve 17.

The track / ground running changeover switch 16a is connected to the controller 32. Controller 32
Has a boom posture determination unit 32a as a determination unit and a travel switching control unit 32b as a travel switching control unit. The boom posture determination unit 32a includes a boom angle sensor 33, a boom length meter 34, and a hook storage state detection unit. Over-wound sensors 35 are connected respectively.

Next, the control operation of the controller 32 will be described with reference to the flowcharts shown in FIGS.

Referring to FIG. 3, a boom posture determination unit 32a of the controller 32 receives a boom angle signal output from a boom angle sensor 33 and a boom length signal output from a boom length meter 34 to perform orbit traveling. Then, it is determined whether or not the current posture of the telescopic boom 4 contacts the overhead wire.

Specifically, first, it is determined based on the boom length signal whether the telescopic boom 4 is in the most contracted state, that is, whether or not each inner cylinder of the multistage telescopic boom 4 is completely stored in the outer cylinder ( If YES in step S1), it is determined whether the boom angle is equal to or less than horizontal (step S2). If YES here, it is determined that the telescopic boom 4 is not in contact with the overhead wire during the track running because the telescopic boom 4 is in the most contracted state and descends forward, and the determination result is given to the running switching control unit 32b. The traveling switching control unit 32b outputs the switching signal Si when the result of the determination is that the contact is not made with the overhead wire (step S3).

The switching signal Si is given to the track / land traveling switch 16a. Therefore, when the track / land traveling switch 16a is closed, the switching signal Si is changed to the track / land traveling switch 16a.
The solenoid of the land travel switching valve 16 flows into the solenoid and switches to the position A. Thereby, the arm lifting / lowering cylinders 2g and 2j can be expanded and contracted via the bearing ring lifting / lowering control valve 17, and the track running can be performed with the bearing rings 2f and 2i placed on the tracks 6,6.

On the other hand, if NO in step S1 or step S2, the boom posture determination section 32a determines that the telescopic boom 4 is not in a posture in which the telescopic boom can travel on the track, and gives the result to the travel switching control section 32b. Travel switching control unit 32b
Does not output the switching signal Si when the result of the determination is that the wire contacts the overhead wire. In this case, even if the track / land travel switch 16a is closed, no switching signal flows to the track / land travel switch valve 16 (step S4). Therefore, the bearing rings 2f, 2
The operation of lowering i is prohibited.

When the posture is not such that the vehicle can travel on the track,
Specifically, when the telescopic boom 4 is tilted upward and the boom angle exceeds the horizontal position of 0 °, this posture is regarded as a boom posture that may be in contact with the overhead wire.

FIG. 4 shows another example in which it is determined whether or not the posture of the telescopic boom 4 contacts the overhead wire.

As in step S1, the boom posture determining section 32a determines whether or not the telescopic boom 4 is in the maximum contraction state (step S5). If YES, the boom angle is equal to or smaller than the predetermined angle θ °. (Step S
6). However, the above-mentioned predetermined angle θ ° refers to the bearing rings 2f, 2f.
This is a boom angle at which the telescopic boom 4 does not come into contact with the overhead line even when i is placed on a track and a crawler for taxiing is lifted.

More specifically, the maximum height of the telescopic boom 4 in the vertical direction can be obtained by the boom angle when the telescopic boom 4 is in the most contracted state. Further, a change in the body height that rises when the track ring is lowered and the crawler for taxiing is lifted is obtained in advance. Accordingly, the maximum height Hmax in the vertical direction in the current posture of the telescopic boom 4 is obtained from these pieces of information, and the Hmax is calculated as the maximum vehicle height Tma.
Compared with x, the boom angle when Hmax = Tmax is set to a predetermined angle θ °.

The vehicle maximum height dimension Tmax indicates the height dimension of the maximum external dimensions regulated by the vehicle traveling on the track, and the vertical maximum height of the telescopic boom 4 indicates the Tmax. If the boom angle is limited so as not to exceed, it is possible to prevent the telescopic boom 4 from contacting the overhead wire with a safety factor.

However, in this case, the posture of the telescopic boom 4 is higher than that of the telescopic boom 4 shown in the processing of FIG. 3, so that the crane can be suspended. . Therefore, in step S7, it is determined whether or not the hook 4f is stored.
We make sure that no lifting work is done.

The retracted state of the hook 4f can be determined by using an overwind sensor 35, for example, a limit switch attached to the boom head 4e. Specifically, FIG. 1 shows a state in which the hook 4f is suspended.
When displaced to the state shown in (b), the overwind sensor 35 operates to output an overwind signal. Therefore, whether or not the hook 4f is stored can be determined based on the presence or absence of the overwind signal.

If YES in step S7, traveling switching control section 32b outputs switching signal Si (step S7).
8). If NO in steps S5, S6, and S7, switching signal Si is not output (step S9). Also by this processing, it is possible to determine whether or not the telescopic boom 4 contacts the overhead wire before traveling on the track, and control the lowering of the bearing ring according to the determination result.

FIG. 5 shows a second embodiment. Note that, for simplicity of description, a hydraulic circuit for raising and lowering the bearing rings 2f and 2i and a hydraulic circuit for operating the telescopic boom 4 are shown in FIG. In the following description, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, a pressure switch 36 as a track running detecting means is provided in an oil passage 17a communicating from the bearing ring lift switching valve 17 to the head side oil chambers of the arm lifting cylinders 2g and 2i. An unload valve 37 for inhibiting crane operation is provided in a branch oil passage 12b branched from an oil passage 12a leading from the pilot pump 12 to the remote control valves 30, 31. This unload valve 3
Reference numeral 7 designates a switching position and an a position. Normally, the switching position is in the a position, and the control pressure discharged from the pilot pump 12 is supplied to the remote control valves 30 and 31.

The pressure switch 36 is connected to a solenoid of an unloading valve 37 as a working device locking means, and when the raceway lifting / lowering switching valve 17 is switched to the c position, the arm lifting / lowering cylinders 2g and 2i extend. When the pressure in the oil passage 17a exceeds a predetermined pressure, the pressure switch 36
Closes, boom operation prohibiting signals S ₁ is output.

[0055] unloading valve 37 receives the boom operation prohibiting signals S ₁ is switched to b position, the control pressure from the pilot pump 12 is relieved to the tank. Therefore, the control pressure is not supplied to the remote control valves 30 and 31, and the operation is locked.

In the case of such a configuration, once the bearing ring 2
Since the crane operation is restricted when the f and 2i are placed on the track 6, it is possible to prevent the telescopic boom 4 from being caused or the catenary contact accident caused by extending the telescopic boom 4 to be prevented.

The track running detecting means of the present invention is constituted by the pressure switch 36 in the above embodiment. However, the present invention is not limited to this. For example, it can be constituted by a position sensor for detecting the displacement of the arm elevating cylinders 2g and 2i. .

FIG. 6 shows the third embodiment, in which the bearing ring can be lowered to the track even when the track is not in the track running posture.

When a crawler moves a short distance while straddling a track while performing a crane operation, it is required to move faithfully along the track. Because ground equipment such as signal cables is laid near the orbit,
This is because if the vehicle greatly deviates from the track, the facilities may be damaged by the crawler. Therefore, in the third invention, the track ring is lowered onto and engaged with the track so that the track working machine can travel along the track, and the track can be used as a guide. However, the body of the track working machine is not lifted even if the track ring is lowered.

In the configuration shown in FIG. 6, the first hydraulic pump 10
Is connected via a traveling motor control valve 19 to a track / land traveling switching valve 40 having a switching position and a key. A land right traveling motor 20 is connected downstream of the switching position, and track traveling motors 2m and 2m are located downstream of the switching position.
n are connected in parallel.

The second hydraulic pump 11 is connected via a traveling motor control valve 21 to a track / land traveling switching valve 41 having a switching position and a switching position. The land left traveling motor 22 is connected downstream of the switching position h, and arm lifting cylinders (cylinders) 2g, 2j for raising and lowering the arms supporting the bearing rings 2f, 2i are connected downstream of the switching position g. ing.

A turning motor 15 is connected to a center bypass of the traveling motor control valve 21 via a turning motor control valve 14.

The solenoids 40a and 41a of the track / land travel switching valves 40 and 41 are connected to a track travel switch 42, respectively. The track running switch 42 is normally open, and pressurized oil is supplied to the land-based right running motor 20 and the land-based left running motor 22. When the track running switch 42 is closed, that is, when a track ring lowering instruction is issued, The track / land traveling switching valve 40 is switched to the key position, and the track / land traveling switching valve 41 is switched to the key position. Thereby, the track running motors 2m and 2n and the arm lifting / lowering cylinder 2g,
Pressure oil is supplied to 2j.

Also, the trajectory /
A branch oil passage 43a is provided in a pressure oil supply passage 43 (leading to the head side oil chambers of the arm lifting / lowering cylinders 2g and 2j) 43 leading to the land traveling switching valve 40, and an electromagnetic switching valve 44 is connected to the branch oil passage 43a. ing.

The electromagnetic switching valve 44 has a shut-off position and a communication position, and is switched to the communication position when the signal Sn is output from the boom posture determination unit 45, and the pressure oil is released from the relief valve (pressure control valve). ) 46 to the tank T. The electromagnetic switching valve 44 and the relief valve 46 function as cylinder control means.

When the electromagnetic switching valve 44 is switched to the position S, the circuit pressure of the pressure oil supply passage 43 communicating with the arm elevating cylinders 2g and 2j is set to the set pressure of the relief valve 46.

Therefore, if the set pressure is set to a pressure at which the bearing rings 2f and 2j lowered onto the track 6 cannot lift the body of the track working machine 1, the track running switch 42 is closed. Since the circuit pressure to the oil chamber on the head side of the arm lifting / lowering cylinders 2g, 2j decreases, the raceway rings 2f,
Although 2j can be lowered to orbit 6, it does not lift the aircraft. Thus, the inner ribs of the races 2f and 2j can be engaged with the race.

A boom angle sensor 33, a boom length gauge 34, and an over-wound sensor 35 are connected to the boom posture determination unit 45, so that the telescopic boom 4 is not in the maximum contraction state and the boom angle is less than θ °. And outputs the signal Sn when the hook 4f is not stored. The boom posture determination unit 45 determines whether or not a crane operation is being performed when the track ring lowering operation is performed. If the crane operation is being performed, the boom posture determination unit 45 determines that the vehicle is not traveling on the track and outputs a signal Sn. In addition, if the storage state of the hook 4f is detected, it can be more accurately determined whether or not the operation is a crane operation. However, the determination may be made based on at least the boom angle and the boom length.

The signal Sn may be output manually by closing a switch (operating body) (not shown).

In the figure, 47 is a right remote control valve for traveling, and 48 is a left remote control valve for traveling. The output ports T ₁ and T ₂ of the traveling right remote control valve 47 are connected to the respective pilot ports T ₁ and T ₂ of the traveling motor control valve 19, and the output ports T ₃ and T ₄ of the traveling left remote control valve 48 are connected to It is connected to each pilot port T ₃ , T ₄ of the traveling motor control valve 21.

Next, the operation of the hydraulic circuit having the above configuration will be described.

(A) In the case of running on a track It is assumed that the boom 4 is in the most contracted state, the boom angle is smaller than θ °, and the hook 4f is in the retracted state as shown in FIG. 1 (b). .

When the track running switch 42 is closed, the track /
The land traveling switching valve 40 is switched to the key position, and the track / land traveling switching valve 41 is switched to the key position.

When pressure oil is supplied to the track running motors 2m and 2n through the track / land running switching valve 40, the track running motors 2m and 2n are driven. On the other hand, when pressure oil is supplied to the arm lifting / lowering cylinders 2g, 2j through the track / land traveling switching valve 41, the arms 2e, 2h rotate downward,
The bearing rings 2f and 2i descend.

At this time, the boom posture determination unit 45 determines that the telescopic boom 4 is in a posture that does not contact the overhead wire based on the detection signals output from the sensors 33 to 35.
The signal Sn is not output, and the electromagnetic switching valve 44 is maintained at the sub-position.

Accordingly, the hydraulic oil discharged from the second hydraulic pump 11 flows directly to the track / land travel switching valve 41 via the travel motor control valve 21, and the arm lifting cylinders 2g, 2
j is introduced into the head side oil chamber. As a result, after the bearing rings 2f and 2i descend on the track 6, the arm lifting cylinder 2
The extension operation of g and 2j is continued, the crawler 2a of the track working machine 1 floats, and the track can be run.

(B) When the track rings 2f and 2j are brought into contact with the track 6 and the crawler travels using the track 6 as a guide, the track rings 2f and 2i rise and the crawler 2a is in contact with the ground. It is assumed that a crane lifting operation is being performed.

When the track running switch 42 is closed, the track /
The land traveling switching valve 40 is switched to the key position, and the track / land traveling switching valve 41 is switched to the key position.

When pressure oil is supplied to the track running motors 2m and 2n through the track / land running switching valve 40, the track running motors 2m and 2n are driven. On the other hand, when pressure oil is supplied to the arm lifting / lowering cylinders 2g, 2j through the track / land traveling switching valve 41, the arms 2e, 2h rotate downward,
The bearing rings 2f and 2i descend. The process up to this point is the same as in the case (a).

At this time, the boom posture judging section 45 judges that the telescopic boom 4 is not in the posture in which the telescopic boom 4 contacts the overhead wire, that is, the orbit running posture, based on the detection signals output from the sensors 33 to 35, and outputs the signal Sn. Therefore, the electromagnetic switching valve 44 is switched to the position S.

When the electromagnetic switching valve 44 is switched to the closed position, the branch oil passage 43a is connected to the tank T through the relief valve 46.
Will be able to communicate with Thus, the circuit pressure of the pressure oil supply passage 43 is set to the set pressure of the relief valve 46.

As described above, since the set pressure is set to a value at which the orbital rings 2f and 2j lowered onto the track 6 cannot lift the body of the track working machine 1, the second hydraulic pump 11 The supply pressure of the pressurized oil discharged from the motor flows through the traveling motor control valve 21, is reduced to the above-mentioned set pressure by the relief valve 46, and is sent to the track / land traveling switching valve 41, and the arm elevating cylinders 2 g, 2 j Is introduced into the head side oil chamber.

As a result, although the bearing rings 2f and 2i can be lowered on the track 6, the arm lifting cylinders 2g and 2
Since the head pressure of j does not rise, the crawler 2a does not float and the engagement state with the track 6 is maintained.

After lowering the races 2f, 2i onto the raceway 6, the left and right traveling remote control valves 48 are operated to slightly reduce the arm elevating cylinders 2g, 2j to slightly lower the races 2f, 2i. Lift the track 6 and the track ring 2
It is preferable to secure a gap between f and 2i. This makes it possible to absorb the vertical movement of the body that occurs when the crawler travels on the uneven surface.

When the races 2f, 2i are engaged with the race 6, the inner ribs of the races 2f, 2i are guided by the race 6. Therefore, when traveling with the crawler, the traveling direction is prevented from deviating in the track width direction (see FIG. 7).

[0086]

As is apparent from the above description,
According to the first aspect of the present invention, before switching to the track running posture, the determining means determines whether or not the working device contacts the overhead line. The track running side switching operation is permitted, and when it is determined that the track running side is contacted, the track running side switching operation is prohibited. Therefore, it is possible to prevent an accident in which the working device comes into contact with the overhead line when traveling on a track.

According to the second aspect of the present invention, when the track running detecting means detects that the track running switching device has been switched to the track running side, the working device locking means sets the working device in a non-operating state. For locking, operation of the working device is prohibited after the bearing ring is placed on the track. Thereby,
An accident in which the actuator contacts the overhead line due to a malfunction can also be prevented.

According to the third aspect of the present invention, when the working device is constituted by a telescopic boom, it is possible to prevent an accident that the telescopic boom comes into contact with the overhead line due to the fact that the telescopic boom is not reduced to the minimum. be able to.

According to the fourth aspect of the present invention, the boom posture is obtained based on the boom angle and the boom length obtained from the existing boom angle sensor and the boom length meter of the crane, and the obtained boom posture and the overhead wire are determined. Can be determined based on the positional relationship of the crane, and whether or not the crane has contact with the overhead wire can be determined by using an existing sensor or the like for the crane.

According to the fifth aspect of the present invention, it is possible to confirm that the crane operation is not performed by determining whether or not the hook is stored by the hook storage state detecting means.

According to the sixth aspect of the present invention, when the track ring is lowered while the wheels or crawlers of the track working machine are in contact with the track, the track ring is placed on the track. The cylinder is controlled so that the track work machine cannot be lifted. In this state, since the inner flange of the race is engaged with the race, the track working machine can be moved using the race as a guide when the wheels or crawlers are driven to travel on land. Thereby,
It is possible to move safely and without breaking equipment such as signal cables laid near the track.

According to the present invention, the cylinder control means can be operated with a simple structure by manual operation.

According to the eighth aspect of the present invention, since the judgment means for judging that the vehicle is not in the track running posture is provided, the track running can be performed according to the posture of the track working machine only by lowering the track ring. Can be automatically switched to land travel with the guide as the guide.

According to the ninth aspect of the present invention, since the supply pressure supplied to the head side oil chamber of the cylinder is reduced by the pressure control valve, the cylinder control means can be realized with a simple configuration.

[Brief description of the drawings]

FIG. 1 (a) is a front view of a track working machine according to the present invention,
(B) is a right side view thereof.

FIG. 2 is a hydraulic circuit diagram according to the first embodiment.

FIG. 3 is a flowchart showing a control operation of a controller 32 shown in FIG. 2;

4 is a flowchart showing another control operation of the controller 32 shown in FIG.

FIG. 5 is a main part hydraulic circuit diagram according to a second embodiment.

FIG. 6 is a hydraulic circuit diagram according to a third embodiment.

FIG. 7 is an explanatory diagram showing a running posture according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Track working machine 2 Lower traveling machine body 3 Upper turning machine body 4 Telescopic boom 10 First hydraulic pump 11 Second hydraulic pump 12 Pilot pump 16 Track / land traveling switching valve 16a Track / land traveling switching switch 17 Control valve for track traveling motor 18 Control valve for track running motor 32 Controller 32a Boom attitude determination section 32b Travel switching control section 33 Boom angle sensor 34 Boom length gauge 35 Overwind sensor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B66C 23/88 B66C 23/88 D E01B 29/00 E01B 29/00 (72) Inventor Toshifumi Kusakabe Assa, Hiroshima-shi 3-12-4 Gion, Minami-ku Kobelco Construction Machinery Co., Ltd. Hiroshima Head Office F-term (reference) 2D057 BA00 3F205 AA09 CA03 CB02 DA04 KA10

Claims (9)

[Claims] An undercarriage provided with wheels or crawlers for land running and a track ring for track running, an upper revolving body to which a working device is attached, and the track ring mounted on a track during track running. A track running switching device that switches to a track running posture by floating the wheels or crawlers from the ground, wherein the working device contacts an overhead line in the track running posture before being switched to the track running posture. A determining means for determining whether or not the track traveling side switching operation is performed by the track traveling switching device when the determining means determines that the track traveling switching apparatus is not in contact with the overhead line; And a travel switching control means for prohibiting a track traveling side switching operation by the vehicle. 2. A lower traveling body provided with wheels or crawlers for land traveling and a track ring for traveling on a track, an upper revolving body to which a working device is attached, and one on which the track ring is placed on a track during traveling on a track. A track running switching device that switches to a track running position by lifting the wheels or crawlers from the ground, wherein the track running switching device is switched to a track running side. And a working device locking means for disabling the working device when the track running side switching operation is detected by the track running detecting means. 3. The track working machine according to claim 1, wherein the working device comprises a crane device configured by a boom that can be raised and lowered and that can expand and contract. 4. The method according to claim 1, wherein the determining means determines a boom posture based on a boom angle and a boom length obtained from a boom angle sensor and a boom length meter, and determines whether or not the boom position comes into contact with the overhead wire. The track working machine according to claim 3, wherein 5. The apparatus according to claim 3, wherein the determining means determines the boom posture and determines whether or not the hook contacts the overhead wire based on the storage state of the hook detected by the hook storage state detecting means. Or the working machine for a track according to 4. 6. A lower traveling body provided with wheels or crawlers for land traveling and a track ring for traveling on a track, an upper revolving body on which a working device is mounted, and a method for mounting the track ring on a track during traveling on a track. A track working machine equipped with a track running switching device for switching to a track running position by lifting the wheels or crawlers from the ground, a cylinder for lowering the track ring on the track, and outputting a signal when not in the track running attitude. And a signal output means for controlling the cylinder so that when the orbit lowering operation is performed, the orbit is lowered to the track based on the output of the signal, but the track working machine is not lifted by the lowering of the orbit. And a cylinder control means. 7. The track working machine according to claim 6, wherein said signal output means comprises an operating body for manually outputting a signal. 8. The apparatus according to claim 6, wherein the signal output means is configured to determine that the vehicle is not in the track running posture based on a boom angle and a boom length obtained from a boom angle sensor and a boom length meter. Track work machine. 9. The track working machine according to claim 6, wherein said cylinder control means has a pressure control valve for reducing a supply pressure supplied to a head side oil chamber of said cylinder.