JP3378461B2 - Boom type work machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom type working machine, and more particularly to a control operation means for controlling a boom, a working tool and the like of the working machine by fluid pressure (hydraulic pressure).

[0002]

2. Description of the Related Art A mast device, such as a two-axis, four-wheel type tractor, which is provided upright on the left and right sides of a traveling vehicle body, is provided with a boom having a work tool (bucket) at its tip so as to be movable up and down. A boom type working machine, for example, a front loader, in which control operation means for controlling a fluid cylinder for operating a boom is mounted on the mast device so as to be operable from a driver's seat is known.

[0003]

In a poultry farm or the like, cages (chicken sheds) are arranged side by side with a working space, and since the working space is relatively narrow, it is possible to travel in this working space and perform boom-shaped operation. Conventionally, when performing work with a work machine, a control operation means is provided on the outer side of the mast device, so that the vehicle width is widened by the control operation means, which makes traveling work in the work space difficult. However, there is a problem that the boom type working machine has low uses.

Further, when the control operation means is provided, the foot of the pedal device (clutch pedal, brake pedal, etc.) provided at the entrance / exit of the traveling vehicle body becomes narrow, which is disadvantageous for getting on / off and maneuverability. There was a problem of becoming low. Such a problem is solved by Japanese Patent Laid-Open No. 7-2077.
The front loader operating device in the tractor disclosed in Japanese Patent Publication No. 01 can be used as a solution.

That is, in the technique disclosed in the above publication, a mounting base is fixed to the tractor body so as to project outward, and a mast mounting portion for detachably connecting the mast of the front loader to the mounting base is attached from the tractor body. A control valve, which is formed separately on the outer side and supplies pressure oil to the hydraulic cylinder of the front loader, is provided on the mounting base, and a valve operating mechanism is provided on a vehicle component near the driver's seat. In a front loader operating device for a tractor, in which the spools are interlockingly connected via wire interlocking means, the control valve is mounted on the surface of the mast attachment portion on the tractor body side with the spool tilted downward and rearward, The lower side of the cabin installed on the tractor body after extending downward It was characterized in that al is inserted therein are coupled with the valve operating mechanism.

In the prior art disclosed in this publication, since the control valve (control valve) is built in the mast device, it is possible to narrow the width, but there is the following new problem. The control valve is operated (controlled) by the wire interlocking means, so slack in the wire is unavoidable,
There is a problem that the control response is slightly inferior.

Since the control valve is installed in the lower part of the mast device, dirt and other foreign substances are apt to be accidentally attached to the mast device, which not only makes the operation heavy but also may cause an erroneous operation. Therefore, according to the present invention, by mounting the control operation means on the upper rear surface side of the mast device, the traveling work can be performed in a narrow work space, and the direct operation by the operation lever (control lever) can be performed without using the wire or the like. The purpose is to secure the operation, improve the responsiveness, and secure the maneuverability.

[0008]

The present invention is directed to a traveling vehicle body 14
A boom 12 having a working tool 11 is provided to be movable up and down on a mast device 13 provided upright on the left and right of the fluid cylinder 1 for operating the working tool 11 and the boom 12.
In the boom type working machine in which the control operation means 21 for controlling the control elements 5, 16 is operable from the driver's seat 22 and attached to the mast device 13, in order to achieve the above-mentioned object, the following technical means are taken. There is.

That is, in the boom type working machine according to the present invention, the control operation means 2 is provided at the upper rear side of one of the left and right mast devices 13 without protruding outward in the left and right direction.
1 is mounted, and by adopting such a configuration, the control operation means 21 does not project outward in the lateral direction, and the entire width of the boom type working machine is widened. It is possible to work in a narrow space such as the poultry farm mentioned above because the boom type work machine is not only used, but also the control lever 21B controls the adhesion of earth and sand to the control valve 21A and the like. Direct operation of the valve 21A has become possible, and operational responsiveness has been secured.

Further, in the present invention, in addition to the above construction, the mast devices 13, 13 are provided with a holder 28 for mounting the boom 12 and the fluid cylinder 15 for the boom 12 on the upper part thereof, and the control valve in the control operation means 21. 21A is housed in the holder 28 and is provided so as to be inclined rearward and upward, and by adopting such a configuration, it is possible to reduce the foot circumference including the pedal device at the entrance / exit 14A. Not only can it be made wider and the passengers can get on and off lighter, but the driver can operate in a natural appearance (posture) while in the driver's seat 22.

Further, in the present invention, the left and right mast devices 13,
Reference numeral 13 includes a holder receiving member 27 provided upright on the left and right of the traveling vehicle body 4 and a holder 28 that can be inserted into and removed from the holder receiving member 27 from above, and the holder 28 is attached to the holder receiving member 27. By providing a lock pin 29 that can be inserted and removed to attach and detach both 27 and 28, the boom 12
It has become easier to attach and detach.

In the present invention, the boom type working machine includes a front loader mounted in front of a traveling vehicle body (tractor body) and an excavator (backhoe) mounted behind the traveling vehicle body. The work implement 11 may be a mania fork or the like other than a bucket.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing the entire contents of a front loader as an example of a boom-type working machine 10 according to the present invention.
A pair of left and right booms 12 having a number 1 is provided to be movable up and down on a traveling vehicle body 14 via a mast device 13, and fluid cylinders 15, 1 for the working tool 11 and the boom 12 are provided.
6, the piping members 17, 18, 19, 20 (see FIGS. 5 and 6) for the fluid cylinders 15, 16 are provided along the longitudinal direction of the right boom 12, and the fluid cylinders 15, 16 are provided. Control operation means 21 for controlling
(See FIGS. 2 and 3) is provided on one (right side) of the left and right mast devices 13 so that it can be operated from the driver's seat 22.

The traveling vehicle body 14 is constructed by connecting a transmission case 23 to the rear surface of the engine, and has a pair of left and right front wheels 24 as steering wheels and a pair of left and right driving wheels as rear wheels 25. It is a wheel-type tractor. The left and right mast devices 13 are provided with a base 26 projecting outward from the vehicle body 14 in the horizontal direction in the vicinity of the entrance / exit 14A in the front-rear direction intermediate portion of the traveling vehicle body 14, and on the upper surface of the base 26, Holder holder 2 having a U-shape in plan view with the front open
7, a holder 28 is detachably attached to the holder receiving member 27.

That is, as shown in FIGS. 2 and 3, the holder 28 is attached to the horizontal shaft 27A installed between the side plates of the holder receiving member 27.
The insertion groove 28A formed in the lower part of the
A lock pin 29 that can be inserted and removed freely allows it to be attached and detached. The base of the boom 12 is provided on the upper part of the pair of left and right holders 28 so as to be vertically movable (ascendable and descendable) by a lateral pin 30, and the left and right booms 12 are in a shape of a "he" in a side view with a middle part bent. A pair of left and right fluid cylinders 15 (hydraulic cylinders) for raising and lowering the boom are attached between the lower portion of the bent portion 31 and the middle portion in the height direction of the holder 28, and the reference numeral 15A indicates the top pin thereof. 15B is a bottom pin.

The pair of left and right booms 12 is shown in FIG.
As shown in (2), it has an upper plate portion 12A and side plate portions 12B and 12B that are connected to the upper plate portion 12A and that face each other on the left and right, and the left and right side plate portions with respect to the width of the upper plate portion 12A. 12
B and 12B are formed in a saddle shape having a longitudinally long cross section, and a strip plate member 12C connecting the left and right side plate portions 12B and 12B to each other is provided in the lower bottom portion to thereby form the strip plate member 12C.
Is formed along the boom longitudinal direction, and the pipe members 17, 18, 19, 20 are formed in the recess 32.
And the pipe members 1 installed side by side
A clamp tool 33 for pressing and clamping 7, 18, 19, 20 from below is provided, and the clamp tool 33 is configured by screwing a bolt 35 into a nut 34 fixed to the strip plate material 12C. Is pressed from below.

Here, the piping members 17, 18, 19, 20 which are housed in the recess 32 and arranged in parallel are shown in FIGS. 7 (1) and 7 (2).
As shown in FIG. 5, the pipe member 17 is arranged in a substantially trapezoidal or inverted trapezoidal arrangement in a cross-sectional view intersecting the longitudinal direction of the boom 12 and is pressed by the clamp tool 33 from below.
˜20 can be positioned by a wedge action. Upper plate part 1
The boom 12 having a hollow closed cross-section including 2A, the left and right side plate portions 12B, and the strip plate member 12C includes the first member 11 on the base side.
2 and the second member 212 on the tip side are joined at the bent portion 31, and as shown in FIG.
The upper plate portion 12A and the left and right side plate portions 12B in FIGS.
Are joined together by.

The pair of left and right booms 12 are connected to each other at a position slightly forward of the bent portion 31 by a horizontal member 37 made of a channel material (channel steel).
A strip 38A is also fixed to the lower bottom of the plate 7 to form a recess 38 extending in the longitudinal direction. In the recess 38, the pipe member 1 for the fluid cylinder 16 for the bucket (work implement) is formed.
Fluid cylinder 15 for 9, 20 and the other (left) boom
Clamping tool 33 for containing the pipe parts 17 and 18 for
It is pressed from below by a bolt 35 and is fixed by a bolt 35.

A bracket 39 is fixed to the central portion of the horizontal member 37 in the longitudinal direction so as to project forward, and one end of the fluid cylinder 16 is pivotally supported by a pin on the bracket 39, and the other end (tip) of the fluid cylinder 16 is supported. ) Is pivotally supported on the work implement 11 by a pin. In the figure, the work implement 11
1 is lifted and lowered by one fluid cylinder 16, but two fluid cylinders 16 may be adopted.

Each of the four pipe members 17 to 20 is made of a steel pipe, and is bent in a substantially "V" shape along the lower bottom of the bent portion 31 of the right boom 12 as shown in FIG. And a plurality of places in the longitudinal direction of the pipe are attached by the clamps 33.
The base portion of the boom 20 is inclined rearward and downward from the lower bottom of the boom 12 and has connectors 17A to 20A at its free end.

Piping member 1 for boom cylinder 15
7, 18 have connecting tools 17B, 18B for connecting the piping members P1, P2 (made of a bent pipe and connected to the top and bottom of the cylinder 15) to the boom cylinder 15 on the right side, It is housed in the recess 32 in the lower bottom portion of the boom 12 on the other side (on the left side) via the horizontal member 37, and its free end is attached by the clamp tool 33, and the free end of the piping member for the boom cylinder 15 on the left side is attached. It has connectors 17C and 18C.

Piping member 1 for bucket cylinder 16
As shown in FIG. 6, the reference numerals 9 and 20 are bent from the right boom 12 along the horizontal member 37, and are provided at their free ends for piping members connected to the top portion and the bottom portion of the bucket cylinder 16. It has connectors 19B and 20B. Referring to FIGS. 2 and 3, the mast device 13 on the right side is provided with the control operation means 21.

Specifically, the holder 28 has a lower half portion 28.
B is an insertion / removal portion for the holder receiving member 27, and an upper half portion 28C is bulged inward as shown in FIG. 3 and is a mounting portion for the control valve 21A. Upper half (control valve mounting part)
Since 28C is bulged inward instead of outward, the lateral width of the left and right mast devices 13 is prevented from becoming wide, and here, a narrow working space (a space where chicken cages are arranged side by side) However, it is possible to drive without any problems.

The control valve 21A is provided with a spool valve for switching the boom up / down, a spool valve for switching the bucket up / down (raising / lowering), etc. arranged side by side in the lateral direction, and is shown on the bottom 40A of the U-shaped valve holder 40. The left and right side plates 40B of the valve holder 40 are attached by bolts or the like and the upper half portion 28C of the holder 28 is
It is fitted in from the rear and is fixed by bolts 41 or the like.

That is, since the control valve 21A in the control operating means 21 is mounted on the rear surface of the holder 28 in a front-entry shape and inclined rearward and upward, the control lever 2
The operability of operating 1B from the driver's seat 22 to the front, rear, left, and right is improved, and the space C below the control valve 21A can be widened to increase the leg circumference, and the connecting elbows 42A to 42G can be connected.
Also, the control valve 21A can be protected from the left and right to prevent accidental entry of earth and sand.

As shown in FIG. 3, the connecting elbows 42A to 42G have a boom-down elbow 42A and a boom-up elbow 42B arranged vertically, and a quick coupler (not shown) at the connection ports 17A, 18A of the piping members 17, 18. Are connected by a flexible hose having, for example, a bucket up elbow 42C and a bucket down elbow 42D are juxtaposed side by side for the boom and arranged vertically, and the piping member 1
It is connected to the connection ports 19A, 20A of 9, 20 by a flexible hose having a quick coupler (not shown).

Further, the inlet (supply) elbow 42E and the tank (return) elbow 42F are arranged side by side on the lower side, and the elbow 42E and the hydraulic outlet (the hydraulic device B of the tractor provided on the tractor body (see FIG. 1)). The hydraulic pressure is supplied to the control valve 21A preferentially over (refer to)) via a flexible hose having a quick coupler (not shown), and the elbow 42F is a flexible hose having a quick coupler (not shown). (Tractor body).

Power Beyond
D) The elbow 42G is connected to a flexible hose or the like via a quick coupler or the like (not shown) and is returned to the control valve of the hydraulic device B. 8 and 9 show the control operation means 2
2 is a second example of the control valve 2 on the rear surface of the mast device 13.
The control valve 21A is housed in the valve stay 43, and the stay 43 is fastened to the side plate of the holder 28 with bolts and nuts 44 and the like.

In this second example, although the operability of the control lever 21B is slightly inferior to that of the first example shown in FIGS. 2 and 3, a sufficient space C around the feet can be secured. In addition,
8 and 9, members common to those in FIGS. 2 and 3 are designated by common reference numerals. In addition, in FIG. 4, reference numeral 45 indicates a stand device, which is foldably provided on the lower bottom of the second member 212 of the boom 12.

In the embodiment described above, a recess 32 is formed in the lower bottom portion of the boom 12 along the boom longitudinal direction, and the pipe members 17, 18, 19, 2 are provided in the recess 32.
0 is housed side by side, and the pipe members 17, 18, 19, 20 are provided side by side with a clamp tool 33 that presses and clamps the pipe members 17, 18, 19, 20 from below, thereby preventing a visual obstacle due to the pipe members 17 to 20. Although the boom 12 is used to protect the pipe members 17 to 20 from falling such as earth and sand, the inner plate portion 12B of the boom 12 is reduced.
Alternatively, the piping members 17 to 20 may be arranged side by side along the longitudinal direction of the boom 12, and the appropriate positions in the longitudinal direction of the piping members 17 to 20 may be pressed and attached by the clamp tool 33.

[0031]

As described in detail above, according to the present invention, running work can be performed without trouble even in a narrow space, and the foot around the entrance and exit can be widened to provide excellent maneuverability and work use. It is possible to provide a boom-type working machine that can expand.

[Brief description of drawings]

FIG. 1 is an overall side view of a boom type working machine according to the present invention.

FIG. 2 is a side view of a mast device and control operation means, which are essential parts of FIG.

FIG. 3 is a front elevational view of FIG.

FIG. 4 is a side view showing a mounted state of a piping member which is a main part of FIG.

FIG. 5 is a bottom view of FIG.

FIG. 6 is a bottom view of FIG. 4 showing an entire main part.

FIG. 7 shows the fitting of piping members, (1) is the first
An example sectional view, (2) is a sectional view of a second example.

8 is a side view showing a second example of the mast device and the control operation means, which are the main parts of FIG. 1. FIG.

9 is a plan view of an essential part of FIG.

[Explanation of symbols]

10 Boom type work machine 11 working tools 12 boom 13 Mast device 21 Control operation means 21A control valve 21B control lever

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-146319 (JP, A) JP-A-8-130917 (JP, A) Actually open 2-132749 (JP, U) Actually open 2- 102908 (JP, U) Japanese Patent Publication 6-60498 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02F 3/34 B62D 49/00

Claims (3)

(57) [Claims] 1. A boom (12) having a work implement (11) is movably provided on a mast device (13) provided upright on the left and right of a traveling vehicle body (14), and the work implement (1) is provided.
1) and boom (12) actuating fluid cylinder (1
5) In the boom type working machine in which the control operation means (21) for controlling (16) is mounted on the mast device (13) so as to be operable from the driver's seat (22), the control operation means (21) is One of the left and right mast devices (13) is provided at the upper rear side with the mast device.
(13) in the front-back direction without protruding outward in the left-right direction
Are disposed so as to overlap with each other, and
From the side of the binder (15) (16), the control operation means (2
The pipe connected to the control valve (21A) of 1) is a mast device.
A boom type working machine, characterized in that it is arranged so as to pass between the left and right side plates of the stand (13) . 2. The left and right side plates of the mast device (13) are provided with front
Open U-shaped valve holder (40) or valve stem
-43 (43) left and right side plate (40B) is fixed,
The control valve (21A) is the valve holder (40) or valve.
The boom type working machine according to claim 1, wherein the boom type working machine is arranged in a U-shape of the stay (43) . 3. A fluid cylinder is provided on the lower surface of the boom (12).
The piping members (17 to 20) for the das (15) and (16)
It is provided and the control valve (2
The pipe connected to 1A) is located below the boom (12).
The boom type working machine according to claim 1 or 2, wherein the boom type working machine is arranged so as to pass between the left and right side plates of the steering device (13) .