JPH10117548A - Work device used also for work wagon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and easily perform mowing work. SOLUTION: A bracket 10 is attached to a hitch 3 provided on the rear part of the car body 2 of a tractor 1, the outer boom part 11a of a boom 11 is supported freely turnably in a vertical direction to the bracket 10 and the outer boom part 11a is turned by a first hydraulic cylinder 21. An inner boom part 11b to the outer boom part 11a is extended and contracted in a car width direction W by a second hydraulic cylinder 22. The upper part of a parallel link type arm 12 is supported to the tip part of the inner boom part 11b turnably in the car width direction W by an upper pin 16 and the parallel link type arm 12 is made turnable in a back and forth direction (the direction of F-R in the figure B) as well. A mower 13 is supported to the lower part of the arm 12 turnably in the car width direction W by a lower pin 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working device mounted on a working vehicle such as a tractor or a construction vehicle, and more specifically, a device suitable for use in mowing work, road surface cleaning work, and the like. About.

[0002]

2. Description of the Related Art An example of this type of working apparatus is disclosed in Japanese Patent Application Laid-Open No. Sho 62-253310.
This is a working device for mowing, in which a boom is vertically rotatably supported on a vehicle body of a work vehicle by a first hydraulic cylinder, and an arm supported on a tip portion of the boom is vertically moved by a second hydraulic cylinder. The mowing machine is rotated in the direction, and the mowing machine supported by the tip of the arm is kept at a predetermined height to drive the work vehicle to cut the mowing.

[0003]

In the above-mentioned prior art configuration, in order to change the height of the mower while keeping the distance between the vehicle body and the mower constant, both the boom and the arm are turned. Operation is required. For this reason, when there is unevenness on the ground to be mowing, the operator needs to finely expand and contract the two cylinders of the first and second cylinders in accordance with the unevenness, so that the operation at the time of mowing becomes complicated. In addition, there is a problem that the working accuracy is reduced. In addition, the efficiency of the mowing work is poor because the traveling speed of the vehicle is reduced by the complicated operation described above. A similar problem arises when the road surface is cleaned using the above working device. SUMMARY OF THE INVENTION An object of the present invention is to facilitate operations during operations such as mowing and cleaning operations, to improve the accuracy of the operations, and to enable efficient operations.

[0004]

According to the present invention, in order to achieve the above object, for example, as shown in FIGS. 1 to 3, a working device for a working vehicle is constituted as follows. (Invention of claim 1) The invention of claim 1 is configured as follows. That is, a boom 11 supported by the vehicle body 2 in a vertically rotatable state and expanded and contracted in a longitudinal direction, and a first actuator 2 for rotating the boom 11 in a vertical direction
1, a second actuator 22 that expands and contracts the boom 11, an arm 12 that is supported by the tip of the boom 11 and that is rotated in the front-rear direction of the vehicle body 2, and that is supported by a lower portion of the arm 12. And a working machine 13.

According to a second aspect of the present invention, in the configuration of the first aspect, the arm 12 is constituted by a parallel link mechanism, and the arm 12 is connected to the boom 1.
1 is configured to be rotatable also in the vehicle width direction W.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the work implement 13 pivots the front grounding wheel 29 and the rear grounding wheel 30 in a freely swingable state. The work machine 13 is provided so as to be switchable to a blocking state, and the working machine 13 is configured substantially symmetrically in the front-back direction.

[0007]

[Effects]

(Invention of claim 1) The invention of claim 1 operates as follows when used for mowing work as shown in FIGS. 1 to 3, for example. As shown in FIG. 1A, when cutting the grass on the mowing surface 7a of the paddy field 7, the work vehicle 1 is moved to the paddy field 7a.
, The boom 11 is turned up and down and expanded and contracted in the vehicle width direction W, so that the mower (working machine) 13 is along the mowing surface 7a. After that, the work vehicle 1 is driven to cut the grass on the mowing surface 7a by the mowing machine 13 described above. If there is a convex portion on the mowing surface 7a during the mowing, the arm 1 follows the convex portion.
When the mowing machine 13 reaches the concave portion of the mowing surface 7a, the arm 12 having the rear upward turning posture is turned forward. It is returned and turned downward. Thereby, the mowing surface 7
The grass a is smoothly cut by the mower 13. In addition, the above-mentioned working machine operates similarly when it is used for road surface cleaning work.

Accordingly, the first aspect of the present invention has the following effects. During work such as mowing or cleaning, the arm is automatically rotated in the working direction following the unevenness of the ground being mowing or the unevenness of the road surface being cleaned, and the height of the work equipment is automatically changed. In addition, it is difficult to leave uncut work such as uncut grass and uncleaned leaves. Further, since the above-mentioned effect is achieved by the arm automatically rotating, there is no need for the operator to finely operate the first actuator and the second actuator. For this reason, work operations such as mowing and cleaning are facilitated, and fatigue of the operator can be reduced.

Further, since the work operation is easy, the operator can concentrate on the operation of the work vehicle and increase the operation speed. As a result, work can be performed efficiently. In addition, since the operator can concentrate on the traveling operation of the work vehicle, traveling errors are reduced. Therefore, in the case of mowing work, crops in paddy fields and fields are suppressed from being stepped on by wheels of the work vehicle, and the yield can be increased.

(Invention of claim 2) The invention of claim 2 basically has the same operation and effect as the above-mentioned invention of claim 1, but also has the following operation and effect. That is, the arm is configured by a parallel link mechanism, and the arm is configured to be rotatable also in the vehicle width direction with respect to the boom. It is possible to easily follow the inclined surface, and work on the inclined surface can be performed efficiently.

(Invention of claim 3) The invention of claim 3 operates basically in the same manner as the above-described invention of claim 1 or 2, but further has the following effect. That is, since the working machine is configured substantially symmetrically in the front and rear, the working machine is smoothly moved in any of the front and rear directions by switching the front and rear contact wheels to the turning prevention state. It is possible to do. For this reason, it is not necessary to change the direction of the work machine according to the traveling direction of the work vehicle, and the work efficiency is further improved. In addition, by switching the front and rear ground wheels to a freely rotatable state, the working machine can move following the expansion and contraction of the boom via the rotatable ground wheels, thereby improving work efficiency and working range. Also becomes wider.

[0012]

1 to 3 show an embodiment of the present invention, in which a tractor is used as a working vehicle and a mowing machine is used as a working machine. FIG.
(A) is a schematic diagram of a state where the working device is viewed from the rear side in the traveling direction of the working vehicle. FIG. 1B is a view taken along line BB in FIG. 1A. FIG. 2 is a plan view of the mower provided in the working device, and is a view corresponding to the view taken along line II-II in FIG. 1. FIG. 3 is an elevational view of the mower described above in a side view.

A hitch 3 is attached to the rear of the vehicle body 2 of the tractor 1, and a mowing device 4 is attached to the hitch 3. In FIG. 1A, reference numerals 5 and 5 denote wheels, reference numeral 6 denotes an operation seat, reference numeral 7 denotes a paddy field, and reference numeral 7a denotes a mowing surface. The arrow F in the figure is the front-back direction of the tractor 1.
(Running direction), the arrow R indicates the rear side in the front-rear direction, and the arrow W indicates the vehicle width direction of the tractor 1.

The mowing device 4 comprises a bracket 10 supported by the hitch 3, a boom 11 supported by the bracket 10, an arm 12 supported by a tip of the boom 11, and an arm 12 supported by the arm 12. And a mower 13 supported at a lower portion. The boom 11 includes an outer boom portion 11a and an inner boom portion 11b which is movably fitted in the outer boom portion 11a in the longitudinal direction. The base of the outer boom portion 11a is rotatably supported by the bracket 10 in the vertical direction, and is rotatably operated by a first hydraulic cylinder (first actuator) 21. A second hydraulic cylinder 22 (second actuator) is provided between the outer boom portion 11a and the inner boom portion 11b, and the boom 11 is extended and contracted by the second hydraulic cylinder 22.

The second hydraulic cylinder 22 is mounted inside the outer boom portion 11a, but may be arranged outside the outer boom portion 11a.
Further, the expansion and contraction mechanism of the boom 11 may be such that a piston-type inner boom part is oil-tightly fitted inside a cylinder tube-shaped outer boom part.

The bracket 10 is supported so as to be able to turn horizontally around a pivot pin 14. Then, by connecting any one of the plurality of positioning holes formed in the bracket 10 and the support hole formed in the hitch 3 with a pin (both are not shown), the bracket 10 and the boom 11 can be turned as desired. Positioned in position.

When the boom 11 is projected in the vehicle width direction W, the upper link portion 12a of the arm 12 is supported by an upper pin 16 so as to be rotatable in the vehicle width direction W at a position near the tip of the inner boom portion 11b. Is done. Its arm 12
Is constituted by a parallel link mechanism, and is rotated by the plurality of connecting pins 18 in the front-rear direction (the direction of FR) of the vehicle body 2.

The lower link portion 12b of the arm 12 described above.
Further, the lower mower 19 supports the mower 13 so as to be rotatable in the vehicle width direction W. The working machine 13 is configured substantially symmetrically back and forth (see FIG. 3). Reference symbol S indicates a supported portion of the mower 13. The mower 13 can be adjusted to a desired horizontal turning position at the supported portion S or the like. The above mower 13 has a first
And the second two frames 25 and 26 can be bent at a desired angle in the vertical direction by hinge means 27.
Although not specifically shown, the hinge means 27 includes a plurality of hinges and a positioning pin for adjusting a bending angle.

The above-mentioned first frame 25 and second frame 2
6, a front ground wheel 29 and a rear ground wheel 30 are supported so as to be switchable between a freely turning state and a turning prevention state. More specifically, a guide pipe 34 is fixed to the front and rear portions of each of the frames 25 and 26, and each of the guide pipes 3
4, the shafts 35 and 36 of the grounding wheels 29 and 30 are fitted to be vertically movable. The shafts 35 and 36 are provided with a plurality of holes 35a and 36a for adjusting the mounting height in the vertical direction, so that the cutting height can be adjusted.

By inserting pins (not shown) into the holes 35a and 36a above the guide pipe 34, the grounding wheels 29 and 30 can be turned around the axes of the shafts 35 and 36. Is done. On the other hand, a pin (not shown) is inserted into the hole 34a of the guide pipe 34, and the guide pipe 34 and the shafts 35 and 36 are connected to each other. Turning is prevented.

The front and rear ground wheels 29 and 30 are
It is preferable to form them with substantially the same diameter as shown, but they may have different diameters. The first cutter 31 is rotatably supported by the first frame 25, and the second cutter 26 is supported by the second frame 26.
The cutter 32 is rotatably supported. These cutters 31
32 is driven by a hydraulic motor and a gear transmission mechanism (both not shown), but may be driven by a general-purpose engine and a belt transmission mechanism (or a wire transmission mechanism).

Next, the operation of the mowing device 4 will be described. As shown in FIG. 1 (A), when mowing the grass on the mowing surface 7a of the paddy field 7, the tractor 1 enters the paddy field so that the wheels 5.5 are located between the rice plants, and the boom 11 is moved up and down. The mowing machine 13 is rotated in the vehicle width direction W, and the grounding wheels 29 and 30 before and after the mowing machine 13 are brought into contact with the mowing surface 7a.

Thereafter, the cutter 31 of the mower 13 is
-The tractor 1 is advanced while rotating 32 to cut the grass on the grass cutting surface 7a. If there is a convex portion on the mowing surface 7a during the mowing, the arm 12 is rotated rearward and upward following the convex portion (FIG. 1).
When the mowing machine 13 reaches the concave portion of the mowing surface 7a, the arm 12 having the rear upward turning posture is returned and rotated forward and downward. As a result, the grass on the mowing surface 7a is smoothly cut by the mower 13. Even when an obstacle collides with the mower 13, the arm 12 is rotated rearward and upward in the same manner as described above, so that the obstacle can be avoided smoothly.

Since the arm 12 is configured to be rotatable in the vehicle width direction W with respect to the boom 11, the mower 13 can be easily moved along an inclined surface such as a bank. Work on the inclined surface can be performed efficiently. When the grass on the furrow is cut, the mower 13 is bent. More specifically, the mower 13 is bent so that the first frame 25 faces the upper surface of the ridge and the second frame 26 faces the inner surface of the ridge.
The tractor 1 is caused to travel in the bent state. Thereby, the grass on the upper surface and the inner surface of the above-mentioned ridge can be simultaneously mowed.

FIG. 4 shows another state of use of the mowing device 4 and is a partial view corresponding to FIG. 1A. This is the rail plate 4 of the guardrail 40 provided on the road 39.
The state in which the grass below 0a is cut off is shown, and the front and rear ground wheels 29 and 30 are switched to a freely swingable state. Code 4
Reference numeral 1 denotes a pillar portion of the guardrail 40 (only one is shown here). When the inner boom portion 11b of the boom 11 is expanded and contracted, the mower 13 can follow the swiveling grounding wheels 29 and 30 in the left-right direction in FIG. For this reason, the pillar 41
It is not necessary to operate the steering wheel of a work vehicle such as a tractor to avoid the problem, and the work can be performed efficiently.

FIG. 5 is a view showing still another use state of the mowing device 4 and corresponds to FIG. 1A.
This shows a state where the undergrowth of the fruit tree 46 in the orchard 45 is cut off, and the front and rear contact wheels (not shown here) are switched to a freely swingable state, as in FIG. 4 described above. Then, when the inner boom portion 11b of the boom 11 is expanded and contracted, the mower 13 is moved in the vehicle width direction W to follow the trunk, and the trunk of the fruit tree 46 can be avoided. For this reason, it is not necessary to operate the handle of the tractor 1 in order to avoid the tree trunk, and work can be performed efficiently. Moreover, boom 11
Has a low boom height H in a state where it is turned downward as shown in the figure. For this reason, the mower 13 can be inserted below the branch of the fruit tree 46, and the undergrowth of the orchard 45 can be cut off efficiently.

The above embodiment can be modified as follows. The mowing device 4 may be attached to the front or side of the tractor 1 instead of being attached to the rear of the tractor 1. The boom 11 may be configured to protrude only to one side in the vehicle width direction W. The boom 11 and the two actuators 21 and 22 may be provided as standard on the tractor 1. In this case, the arm 12 and the mower 13 according to the present invention may be removably attached to the tip of the boom 11 provided as standard equipment. The actuators 21 and 22 may be other types of actuators such as pneumatic cylinders and fluid pressure motors instead of hydraulic cylinders.

The cutter of the mower 13 is not limited to two, but may be one or three or more. The mower 13 may be configured so as not to bend. The work vehicle may be a hydraulic shovel instead of the tractor, or may be another type of agricultural vehicle or construction vehicle. The working machine may be a vacuum cleaner for cleaning roads, factory floors, and the like, instead of the mower.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 (A)
FIG. 4 is a schematic diagram of a state where the working device is viewed from the rear side in the traveling direction of the working vehicle. FIG. 1B is a cross-sectional view of FIG.
FIG.

FIG. 2 is a plan view of the mower provided in the working device, and is a view corresponding to the view taken along the line II-II in FIG. 1;

FIG. 3 is a side elevational view of the mower.

FIG. 4 is a partial view showing another use state of the working device and corresponding to FIG. 1A.

FIG. 5 shows still another use state of the working device,
FIG. 2 is a diagram corresponding to FIG.

[Explanation of symbols]

2 ... Car body, 11 ... Boom, 12 ... Arm, 13 ... Work machine
(Mower), 21: first actuator (first hydraulic cylinder), 22: second actuator (second hydraulic cylinder), 29: front contact wheel, 30: rear contact wheel, W: vehicle width direction.

Claims (3)

[Claims] 1. A boom (11) supported by a vehicle body (2) in a vertically rotatable state and extended and contracted in a longitudinal direction.
A first actuator (21) for rotating the boom (11) in the vertical direction; a second actuator (22) for expanding and contracting the boom (11); and a first actuator (22) supported by the tip of the boom (11). An arm (12) turned in the front-rear direction of the vehicle body (2), and a working machine (13) supported below the arm (12). Working equipment. 2. The arm (12) is formed by a parallel link mechanism, and the arm (12) is configured to be rotatable in the vehicle width direction (W) with respect to the boom (11). A working device for a working vehicle according to claim 1. 3. The work machine (13) is provided with a front contact wheel (29) and a rear contact wheel (30) so as to be switchable between a freely turning state and a turning prevention state. The working device for a working vehicle according to claim 1, wherein the working device is configured substantially symmetrically in front and rear.