JP2003232052A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle which occupies only a small area for installation, can easily move in a narrow place, and has a long working machine mounted thereon. <P>SOLUTION: The working vehicle comprises a first boom 10 rotatably mounted on a chassis 3, a second boom 13 rotatably mounted on the first boom 10, the long working machine 17 having its longitudinal midpoint rotatably mounted on the second boom 13, and a hydraulic rotating device 16 for these booms and the working machine. When the working vehicle assumes a traveling position, the first boom 10 is tilted and collapsed toward the rear of the chassis, the second boom 13 toward the front of the same, and the working machine 17 toward the rear of the same, respectively, whereby the long working machine 17 can be held in a horizontal position. In the traveling position, a longitudinal central portion of the working machine is allowed to nearly coincide with a longitudinal central portion of a traveling device 2 of the working vehicle. Further, the first and second booms overhang on the front side of the chassis, and when the working machine overhangs to a maximum extent, the second boom assumes a horizontal position. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle equipped with a long working machine, and more particularly to a work vehicle equipped with a boring device.

[0002]

2. Description of the Related Art Conventionally, various types of work vehicles equipped with long working machines such as boring devices have been devised and used for ground improvement. In recent years, in addition to the soft ground improvement device, development of a purification device for contaminated soil has been required as part of measures against environmental pollution. In addition, there is an increasing need for a small mobile ground improvement machine in order to improve the ground in a narrow land such as a residential land or to improve contaminated soil.

FIG. 11 shows an example of a soil purification construction device.
Japanese Patent Application Laid-Open No. 10-5737, which is disclosed in Japanese Patent Laid-Open No. 10-5737. In FIG. 11, a pipe shaft 61 having stirring blades 62, 62 for stirring is vertically attached to a front portion of a vehicle body 60, and a hose is provided from a quicklime supply plant 63 separately installed outside the vehicle body 60. Quick lime is supplied into the pipe shaft 61 via 64, and quick lime is injected into the soil from an injection nozzle (not shown) provided in the vicinity of the stirring blade 62 to stir the volatile evaporation of pollutants in the soil. I'm trying to get it done. The volatilized and vaporized polluted gas is processed by a pollution-free processing plant 65 installed near the vehicle body 60.

FIG. 12 is a side view showing an example of a small ground improvement machine. In FIG. 12, a crawler type traveling device 2
A vehicle body 3 having a driver's cab 4 is provided on one side in the left-right direction, and a boring device 70 is mounted on the side of the driver's cab 4 substantially parallel to the ground. The total length R of the boring device 70 is, for example, 7 m to 8 m, one end of which is located laterally of the cab 4 and the other end of which is projected rearward of the vehicle body. During work, as shown by the chain double-dashed line, attach the boring device 70 to the vehicle body 3
It is designed to stand upright in front of and perform work such as excavation and drug injection.

[0005]

However, the above-mentioned conventional structure has the following problems. In the soil purification construction device disclosed in Japanese Unexamined Patent Publication No. 10-5737, the quick lime supply plant 63 and the pollution-free treatment plant 65 are installed separately from the vehicle body 60. Therefore, the space required for the installation is increased and these plants are also installed. There is a problem in that it is not suitable for work in a narrow space because it is troublesome to move and install. In the small ground improvement machine as shown in FIG. 12, since the vehicle body 3 is small and the working machine (boring device 70) projects largely rearward from the vehicle body 3 during movement, the stability in the front-rear direction is poor, Moreover, there is a problem that it is difficult to move in a narrow place. In addition, for example, when performing boring all over the ground in a contaminated soil cleaning operation, it is troublesome because the vehicle needs to be moved once for boring positioning, and the positioning operation by moving the vehicle is difficult, which makes workability easier. There is a problem that is not good.

The present invention has been made paying attention to the above-mentioned problems, and a long working machine capable of occupying a small space in an installation place and easily carrying out vehicle movement and positioning of a working machine in a narrow space is provided. It is intended to provide a work vehicle equipped with the work vehicle.

[0007]

In order to achieve the above object, a first invention is a work vehicle equipped with a long working machine, in which a base end portion is swingably attached to a vehicle body. A first boom, a second boom having a base end portion swingably attached to a tip end portion of the first boom, and a long boom having a longitudinal intermediate portion swingably attached to a tip end portion of the second boom. And a hydraulic swinging device that swings the first boom, the second boom, and the working machine, respectively. The first boom is tilted to the rear side of the vehicle body, and the second boom is moved to the front side of the vehicle body. In the running posture in which the working machine is tilted and further tilted toward the rear side of the vehicle body, the long working machine can be held substantially horizontally.

According to the first aspect of the present invention, the first boom, the second boom and the working machine are sequentially swingably connected to each other so that the working machine can be held in a substantially horizontal position by folding the working machine.
For this reason, the entire vehicle can be made compact, so that the running stability and the ability to enter a narrow space can be improved.
Further, by extending the folded first and second booms, the working machine can be extended to the front side of the vehicle body, whereby the position of the working machine can be moved while the vehicle is stopped, and at the same time, the hydraulic rocking device is provided. By doing so, fine adjustment of the position can be easily performed, so that workability can be improved.

According to a second aspect of the present invention, in the first aspect, the center position of the working machine in the longitudinal direction is substantially equal to the center position of the traveling device of the vehicle in the front-rear direction.

According to the second aspect of the invention, the center position of the length of the working machine in the longitudinal direction is located near the center position of the traveling device in the front-rear direction. Therefore, the front-back direction of the vehicle is well-balanced in the running posture, and the overhang length (projection amount) of the working machine in the vehicle front-rear direction is shortened, so that the stability can be greatly improved and in a narrow area. Driving becomes easier and versatility can be improved.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the first boom and the second boom are projected to the front side of the vehicle body, the working machine is substantially upright, and the lower end portion thereof is grounded. When the work is fully extended,
The second boom is configured to be substantially horizontal.

According to the third aspect of the invention, the second boom is substantially horizontal when the working machine is maximally extended and in the working posture, so that the length of the second boom can be utilized to the maximum extent. The distance from the work machine can be increased. Further, by bending the first boom and the second boom, it is possible to reduce the distance between the vehicle body and the working machine, so that the workable range in the vehicle stopped state is widened and the workability can be improved.

A fourth aspect of the present invention is configured such that, in the first, second or third aspect, the long working machine is a boring device.

According to the fourth aspect of the invention, by applying the long boring device, it is possible to efficiently perform the contaminated soil improvement work or the soft ground improvement work in a narrow place,
It is possible to easily perform work such as improving the residential area.

A fifth aspect of the present invention is the vehicle body according to the fourth aspect of the invention, in which a soil improving agent supply device is mounted on the vehicle body.

According to the fifth aspect of the invention, since the soil conditioner supplying device, which is conventionally placed separately from the vehicle body, is mounted on the vehicle body, it can be easily moved and installed in a short time, and the installation place can be small. For this reason, ground improvement work and contaminated soil improvement work in a small residential area or the like become easier, and versatility and work efficiency can be improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a work vehicle according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view of a contaminated soil conditioner 1 which is an example of a work vehicle. In FIG. 1, a vehicle body 3 is rotatably mounted on a crawler type traveling device 2. An operator's cab 4 is provided in the front part of the vehicle body 3, and a power part 5 is provided substantially in the center part.
Is provided, and the soil improving agent supply device 40 is mounted at the rear end. A base end portion of the first boom 10 is swingably attached to a front portion of the vehicle body 3 by a first pin 11, and a front end portion of the vehicle body 3 and a front end portion of the first boom 10 have a multi-stage first structure.
It is connected by a cylinder 12. First cylinder 12
When the vehicle is extended or contracted, the first boom 10 swings in the front-rear direction of the vehicle body 3 about the first pin 11. Also, the first boom 10
The base end of the second boom 13 is attached to the tip of the second pin 14
The tip end portion of the first boom 10 and the tip end portion of the second boom 13 are connected to each other by a second cylinder 15. By expanding and contracting the second cylinder 15, the second boom 13 swings in the front-back direction of the vehicle body 3 around the second pin 14. Further, at the tip end of the second boom 13, an intermediate portion in the longitudinal direction of the column 23 of the boring device 20, which is an example of the long working machine 17, is formed.
1, the base end portion of the second boom 13 and the support column 23 are connected by a working machine cylinder 22. When the working machine cylinder 22 is expanded and contracted, the boring device 20 swings around the working machine pin 21 in the front-back direction of the vehicle body 3. These first cylinder 12, second cylinder 15 and working machine cylinder 22 form a hydraulic swing device 1
6 is composed.

FIG. 1 shows a traveling posture of the polluted soil improving machine 1. In this traveling posture, the first cylinder 12 is extended to tilt the first boom 10 toward the rear of the vehicle body 3, and The cylinder 15 is contracted and the second boom 13 is tilted substantially horizontally toward the front. Further, the working machine cylinder 22 is contracted so that the boring device 20 is tilted so as to be folded backward and substantially horizontally so as to be folded over the second boom 13. In this state, the center position XX of the boring device 20 in the longitudinal direction is the center position YY of the traveling device 2 in the front-rear direction.
It is located near.

FIG. 2 is a side view of the boring device 20. In FIG. 2, a speed reducer 26 connected to an output shaft of a hydraulic motor 25 is attached to a sliding member 24 slidably engaged with a column 23 in the longitudinal direction. The boring shaft 30 is connected to the output side. The boring shaft 30 includes a hollow shaft 31 provided along the longitudinal direction of the support column 23, an excavation blade 32 provided at the tip end thereof, an extraction blade 33, and a plurality of stirring blades 34. . The base end of the hollow shaft 31 of the boring shaft 30 is rotatably inserted into the other end of a swivel joint 27 having one end attached to the sliding member 24.
An improving agent supply pipe 28 is connected to the swivel joint 27, and the improving agent supplied from the improving agent supply pipe 28 passes through the swivel joint 27 and a pipe path inside the hollow shaft 31 and a tip of the boring shaft 30. It is designed to be ejected from the department.

FIG. 3 is a view taken in the direction of arrow A in FIG. 2 and shows a top view of the boring device 20 of the first embodiment. In FIG. 3, three sets of hydraulic motors 25, reduction gears 26, and boring shafts 30 are attached to the sliding member 24 in series in the vehicle body left-right direction (upward-downward direction in the drawing), as shown by the two-dot chain line. The outer peripheral portions of the three boring shafts 30 are close to each other. The outer peripheral portions of the three boring shafts 30 may be partially overlapped with each other.

FIG. 4 is a rear view of the soil conditioner supplying device 40, which is a view taken in the direction of arrow B in FIG. In FIG. 4, a hopper 41 for kneading raw materials such as apatite, iron powder, and an auxiliary agent to generate an improving agent is provided on one side of the soil improving agent supply device 40 in the left-right direction of the vehicle body. Is provided with a transfer conveyor 42 configured by a screw conveyor or the like for transferring the generated improving agent. Soil conditioner supply device 4
An improving agent tank 43 is provided on the other side in the left-right direction of 0, and a transfer conveyor 42 is connected to an upper portion of the improving agent tank 43 via a transfer pipe 44. The improver tank 43 stores the kneaded improver, and also the pressure feed pump 4
It connects with the improvement agent supply pipe 28 shown in FIG. 2 via 5, and the improvement agent is supplied to the boring device 20 by the pressure feed pump 45.

Next, the operation will be described with reference to FIG. FIG. 5 shows a working posture of the contaminated soil improving machine 1. At the time of work, first, the vehicle body 3 is moved in the front-back direction of the traveling device 2 by 9
Turn 0 degrees. Next, the first cylinder 12 is contracted to tilt the first boom 10 in front of the vehicle body 3, and
The cylinder 15 is extended and the second boom 13 is projected forward. Then, the working machine cylinder 22 is extended to erect the boring device 20, and the tip of the boring device 20 is grounded. When the distance from the turning center line C-C of the vehicle body 3 to the axis D-D of the boring shaft 30 is the maximum (Lmax), the second boom 13 is substantially horizontal. As shown by the chain double-dashed line in the figure, the refraction angle between the first boom 10, the second boom 13, and the boring device 20 is changed to change the second boom 1
By inclining 3 with respect to the horizontal line, the distance from the turning center line C-C of the vehicle body 3 to the axis D-D of the boring shaft 30 can be reduced. The minimum distance is Lmi
If n, the difference value L between the maximum distance Lmax and the strongest distance Lmin is the working range of the boring device 20 in the vehicle front-rear direction when the vehicle is stopped. As described above, after the boring device 20 is placed upright and in the working posture, the boring device 20 rotates the three boring shafts 30 at the same time,
Boring to a specified depth.

In the hopper 41 of the soil improving agent supply device 40, apatite, iron powder, auxiliary agent, etc. are kneaded, and the kneading improving agent is transferred to the improving agent tank 43 by the transfer conveyor 42. Then, the improver tank 4 is supplied by the pressure pump 45.
3 through the modifier supply pipe 28 shown in FIG.
It is fed under pressure to the tip of the boring shaft 30 and injected into the soil, and the stirring blade 34 stirs the contaminated soil and the improving agent.

The above work is continuously performed over the entire contaminated area. FIG. 6 is a plan view showing the progress of the boring work. As shown in FIG. 6, three borings are performed closely in series in the lateral direction. During this continuous horizontal boring operation, the contaminated soil improvement vehicle 1 is moved and positioned in the front-rear direction (perpendicular to the paper surface of FIG. 5) by the traveling device 2 and positioned. When the second row and the third row are performed, the first cylinder 12, the second cylinder 15, and the working machine cylinder 22 are operated to position the second and third rows. Therefore, it is not necessary to change the position of the traveling device 2 for positioning. The hatched portion shows the portion where the contaminated soil and the improving agent have already been stirred.

Since the work vehicle of the present invention has the above-mentioned structure, the following effects can be obtained. The first boom, the second boom, and the working machine are swingably connected to each other, and they are folded during traveling to make the working machine substantially horizontal, and
The central position of the working machine in the longitudinal direction is near the central position of the traveling device in the front-rear direction. Therefore, the entire vehicle becomes compact, the stability in the front-rear direction is good, and it is easy to move in a narrow place. Therefore, if the working machine is a boring device, it is possible to improve the contaminated soil in a narrow place such as a residential land, to improve the soil quality, and to improve the versatility of the work vehicle. In the work posture, the second boom is configured to be substantially horizontal when the work implement is maximally extended, so that the position of the work implement from the vehicle body when maximally extended can be increased. Therefore, it is possible to increase the work range when the vehicle is stopped and improve workability. Since the soil conditioner supply device is installed in the vehicle, it is not necessary to install it separately and the vehicle can be moved easily.
Also, since the installation area is reduced, it is possible to work in tight spaces and improve versatility. By turning the vehicle body 90 degrees with respect to the traveling device and traveling with the traveling device at the time of work, continuous boring work in the vehicle body left-right direction (vehicle front-rear direction) becomes easy. Also, by operating the boom and the boring device, it is easy to position the boring device in the vehicle front-rear direction (vehicle left-right direction) when the vehicle is stopped.
And it can be done accurately and the workability is improved. Furthermore, since three boring devices are provided, work efficiency can be improved.

Next, a second embodiment will be described with reference to FIG. FIG. 7 is a top view of the boring device 20a of the second embodiment. In FIG. 7, the sliding member 24 of the boring device 20 is connected to the output shaft of the hydraulic motor 25a,
Further, a speed reducer 26a having two output shafts is attached, and the two boring shafts 30, 30 are driven by one hydraulic motor 25a.

Next, an embodiment applied to a soft ground improvement machine as a work vehicle will be described with reference to FIGS. FIG. 8 is a top view of the boring apparatus 20b of the soft ground improving machine,
FIG. 9 is a partial cross-sectional view taken along the line EE of FIG. 8 and 9
In the sliding member 24a, two hydraulic motors 25,
25, speed reducers 26, 26a, and boring shafts 30a, 30a connected to the speed reducers 26, 26a, respectively, are arranged at predetermined intervals on the left and right. The sliding member 24a is provided with an elongated hole 35, the speed reducer 26 on one side is fixed to the sliding member 24a, and the speed reducer 26a on the other side is movable in the left-right direction along the elongated hole 35. ing. Sliding member 24
a and an arm 37 provided on the reduction gear 26a on the other side are connected by a hydraulic cylinder 36, and by extending and contracting the hydraulic cylinder 36, two boring shafts 30a and 30a The interval can be changed. FIG. 10 is a view on arrow F of FIG. In FIGS. 9 and 10, the boring shaft 30a is located at the center of the elongated hole 35, and spacers 50, 50 are provided on the left and right sides of the boring shaft 30a by bolts 52 to the female screw 51 provided on the sliding member 24a. There is.

In FIG. 8, as described above, the hydraulic cylinder 36 can be expanded and contracted to be changed to three positions a, b and c. In that case, the distance between the speed reducer 26 and the speed reducer 26a is d (for example, 600 mm) at the a position and e (for example, 900 m) at the b position.
It is f (for example, 1200 mm) at the positions m) and c. Figure 1
At 0, when the boring shaft 30a is set to the a position or the c position, the position of the speed reducer 26a can be fixed by moving the position of the spacer 50.

Since the soft ground improvement machine of the present embodiment has the above-mentioned structure, it is possible to perform boring at two locations at a time, and according to the soil condition, one boring axis can be moved without moving the vehicle. The boring interval can be changed by the mechanism. Therefore, work efficiency can be improved.
In the case of the soft ground improvement machine, raw materials of cement and water are supplied to the hopper 41 of the soil improvement agent supply device 40 described with reference to FIG. Store in.

In the above embodiments, the vehicle is of the crawler type, but other types such as wheel type may be used. Further, the boring device has two or three boring shafts, but it may have more boring shafts. Further, the long working machine may be other than the boring device.

[Brief description of drawings]

FIG. 1 is a side view (running posture) of a contaminated soil improving machine which is an example of an application machine of the present invention.

FIG. 2 is a side view of a boring device.

FIG. 3 is a top view of the boring apparatus of the first embodiment of the contaminated soil improvement machine.

FIG. 4 is a rear view of the soil conditioner supply device.

FIG. 5 is a side view showing a work posture of the contaminated soil improving machine.

FIG. 6 is a plan view showing the progress of a boring operation.

FIG. 7 is a top view of the boring device of the second embodiment.

FIG. 8 is a top view of a boring device for a soft ground improvement machine, which is an example of an application machine of the present invention.

9 is a partial cross-sectional view taken along the line EE of FIG.

10 is a view on arrow F of FIG.

FIG. 11 is a side view of a conventional soil purification construction device.

FIG. 12 is a side view of a conventional small ground improvement machine.

[Explanation of symbols]

1 ... Contaminated soil improving machine, 2 ... Traveling device, 3 ... Car body, 10 ...
1st boom, 12 ... 1st cylinder, 13 ... 2nd boom,
15 ... 2nd cylinder, 16 ... Hydraulic type rocking | fluctuation apparatus, 17 ... Working machine, 20, 20a, 20b ... Boring apparatus, 22 ...
Working machine cylinder, 23 ... Strut, 24, 24a ... Sliding member, 25, 25a ... Hydraulic motor, 26, 26a ... Reducer, 28 ... Improvement agent supply pipe, 30, 30a ... Boring shaft, 35 ... Oblong hole, 36 … Hydraulic cylinder, 40… Soil conditioner supply device, 50… Spacer.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) E02D 3/12 102

Claims (5)

[Claims] 1. In a work vehicle equipped with a long working machine, a first boom (10) having a base end portion swingably attached to a vehicle body (3) and a tip end portion of the first boom (10). A second boom (13) having a base end swingably attached, and the long working machine (17) having a longitudinal intermediate portion swingably attached to a tip end of the second boom (13). , A hydraulic swing device (16) for swinging the first boom (10), the second boom (13) and the working machine (17), respectively
And the first boom (10) is tilted rearward of the vehicle body (3), the second boom (13) is tilted forward of the vehicle body (3), and the work implement (17) is further tilted toward the vehicle body (3). ) Is a work vehicle characterized by being able to hold the long working machine (17) substantially horizontally in a traveling posture in which the working machine (17) is tilted and folded rearward. 2. The center position in the longitudinal direction of the working machine (17) in the traveling posture is substantially equal to the center position in the front-rear direction of the traveling device (2) of the vehicle. Work vehicle. 3. The first boom (10) and the second boom (1)
When the working machine (17) is extended to the front side of the vehicle body (3), the working machine (17) is almost upright, and the lower end of the working machine (17) is grounded. The work vehicle according to claim 1 or 2, wherein (13) is substantially horizontal. 4. The boring machine is the long working machine (17).
(20) The work vehicle according to claim 1, 2 or 3, characterized in that it is (20). 5. The work vehicle according to claim 4, wherein the vehicle body
A work vehicle having the soil conditioner supply device (40) mounted on (3).