JPH0529257Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a full swing type work machine such as a hydraulic excavator, and in particular, the invention is concerned with a fully rotating working machine such as a hydraulic excavator, and in particular, it is possible to perform work suitably by rotating the upper revolving body even in a narrow work site. This invention relates to a full-swivel type work machine that is designed to rotate.

[Prior art]

FIG. 6 and FIG. 7 show a hydraulic excavator as an example of a fully rotating working machine according to the prior art.

In the figure, 1 denotes an undercarriage, 2 denotes an upper revolving body rotatably mounted on the undercarriage 1, and the upper revolving body 2 is a frame 2 forming a frame structure.
A, and the frame 2A is equipped with a machine room cover 3A.
A machine room 3 is provided which is covered by a. As shown in FIG. 7, inside the machine room 3,
An engine 4, a hydraulic pump 5, a radiator 6, an oil storage tank 7, and the like are housed. Note that FIG. 7 shows a state in which the machine room cover 3A is removed. Reference numeral 8 indicates a driver's cab located on the front left side of the machine room 3 and provided in the frame 2A. A plurality of operation levers (not shown) are provided in the driver's cab 8, and each operation lever is provided in the driver's cab 8. The lever is each direction switching valve 9, which will be described later.
10 is controlled by switching.

Reference numerals 9 and 9 indicate main directional switching valves located in the driver's cab 8 and provided below the driver's seat. Pressure oil from the pump 5 is supplied to the travel motor of the lower traveling body 1, the swing motor of the upper rotating body 2 (none of which are shown), and each cylinder 16, 17, which will be described later.
It is designed to supply and discharge to 18th mag. Reference numeral 10 denotes a directional control valve for an attachment provided in the driver's cab 8 similarly to the directional control valves 9;
0 is switched and controlled by another operating lever in the operator's cab 8, and supplies and discharges pressure oil from the hydraulic pump 5 to the lifting cylinder of the earth removal plate 19, which will be described later.
The earth removal plate 19 is raised and lowered between a working position and a non-working position.

Further, reference numeral 11 indicates a counterweight located on the rear side of the machine room 3 and provided on the frame 2A, and the counterweight 11 is a curved portion formed by curving along a circle 20 with a turning radius R, which will be described later. 1
1A, and an arcuate portion 11B that is integrally provided inside the curved portion 11A.
The upper rotating body 2 is balanced with respect to the rotating upper body 2.

Reference numeral 12 denotes a working device installed at the front of the revolving upper structure 2 so as to be able to rotate upward and downward. It consists of an arm 14 connected with a pin on the tip side and a bucket 15 connected with a pin on the tip side of the arm 14, and these are rotated by a boom cylinder 16, an arm cylinder 17, and a bucket cylinder 18. It's getting old.

Further, reference numeral 19 indicates a soil removal plate as an attachment that is provided on the front part of the undercarriage body 1 so as to be movable up and down. Pressure oil from the hydraulic pump 5 is supplied to and discharged from the lifting cylinder by the directional switching valve 10 for the attachment, thereby moving the earth removal plate 19 between the working position and the non-working position. It is designed to be raised and lowered between the two.

In the hydraulic excavator configured as described above, the main directional switching valves 9 are switched and controlled by the operation lever in the driver's cab 8, and the respective cylinders 16, 17, 18 are switched.
By operating boom 13, arm 1
4 and the bucket 15 are rotated, and the bucket 1
5, earth and sand excavation work is carried out. on the other hand,
The directional control valve 10 for the attachment is switched and controlled by the other operating lever in the operator's cab 8, and the earth removal plate 19 is
The lower traveling body 1 is lowered by operating the lifting cylinder for lowering the earth removal plate 19 to the working position.
While running, earth removal work, earth leveling work, etc. are performed using the earth removal plate 19.

When performing earth and sand excavation work in a narrow site, etc., the boom 13 is rotated upward (raised) as shown in Fig. 6, and the arm 12 and bucket 13 are rotated to fold. Thereafter, the upper rotating body 2 is rotated along a circle 20 having a radius of rotation R shown in FIG. 7, thereby orienting the working device 12 in a desired direction.

[Problem that the invention attempts to solve]

However, in the above-mentioned prior art, since the front left corner 8A of the driver's cab 8 indicated by diagonal lines in FIG. 7 protrudes outside the circle 20 with the turning radius R, the upper The actual turning radius of the rotating structure 2 becomes large. In particular, since each of the main directional switching valves 9 and the attachment directional switching valve 10 are provided in the operator's cab 8, the amount of protrusion of the corner portion 8A increases.

For this reason, in the conventional technology, when rotating the upper revolving structure 2 in a narrow work site, the corner portion 8 of the operator's cab 8
There is a drawback that A collides with surrounding structures or obstacles, causing an accident that may damage the driver's cab 8 or injure the driver.

The present invention was developed in view of the above-mentioned shortcomings of the prior art.The present invention prevents the operator's cab from colliding with surrounding obstacles even when the upper revolving structure is rotated in a narrow work site. To provide a fully rotating working machine which can eliminate accidents such as damage to a chamber and injury to a driver.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes an undercarriage, a machine room that is rotatably mounted on the undercarriage, and a driver's cab located in the front side of the machine room. In a full swing type working machine comprising an upper revolving body provided with a counterweight, and directional control valves for main and attachment provided on the upper revolving body, the operation is performed within the swing radius of the upper revolving body. The chamber is moved back toward the machine room, a main directional switching valve among the directional switching valves is provided in the driver's cab, and an attachment directional switching valve is located and installed near the counterweight. The following configuration is adopted.

[Effect]

With the above configuration, there is no need to provide a directional control valve for attachment in the driver's cab as in the prior art, and it is possible to prevent the living space in the driver's cab from becoming narrow. Since the operator's cab can be placed within the turning radius of the revolving upper structure, even when the revolving upper structure is rotated in a narrow work site, the operator's cab will not collide with surrounding structures or obstacles. It can be prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5. In this embodiment, the same components as those of the prior art shown in FIGS. 6 and 7 described above are given the same reference numerals, and their explanations will be omitted.

In the figure, 21 is located on the front left side of the machine room 3,
This shows a driver's cab provided on the frame 2A of the upper revolving body 2, and the driver's cab 21 is formed to have almost the same dimensions as the driver's cab 8 described in the prior art, and is designed to satisfy ISO standards, etc. ing. However, a concave portion 21A formed in a substantially rectangular parallelepiped shape is provided at the rear lower side of the driver's cab 21 at a predetermined distance from the left side surface of the driver's cab 21. And the driver's cabin 21
is connected to the radiator 6 of the machine room 3 via the recessed part 21A.
It is arranged on the frame 2A of the upper revolving body 2 in a state of being retreated to the side, and a part of the radiator 6 etc. is housed inside the recessed part 21A. Thus, the driver's cab 21 is arranged within a circle 20 having a turning radius R, as shown in FIG.
Further, a plurality of operating levers (not shown) are provided in the operator's cab 21, and each operating lever is adapted to switch and control each direction switching valve 27, 28, which will be described later.

Reference numeral 22 is a support member located on the right front end side of the recessed part 21A and erected at a predetermined height on the frame 2A of the upper revolving body 2; The beds 23, 24, and 25 are respectively located on the left front, right front, and left rear sides of the driver's cab 21 to support the driver's cab 21. It is interposed between the driver's cab 21 and the frame 2A. and,
The bed 26 located on the right rear side of the driver's cab 21 is arranged between the upper surface of the concave portion 21A and the support member 22 so as to support the right rear portion of the driver's cab 21 at a position higher than the other beds 23 to 25 by a predetermined dimension. It is interposed between.

Further, 27 and 27 indicate main directional switching valves provided in the driver's cab 21, and each directional switching valve 2
Reference numeral 7 has the same structure as each directional control valve 9 described in the prior art section, and is disposed below the driver's seat 21B in the driver's cab 21 (see FIG. 4). The directional switching valves 27 are switched and controlled by respective operation levers in the driver's cab 21 to operate the travel motor, swing motor, cylinders 16, 17, 18, and the like.

Furthermore, 28 indicates a directional switching valve for an attachment located between the curved part 11A of the counterweight 11 and the hydraulic pump 5 and attached to the curved part 11A. It is connected to other operating levers in the driver's cab 21 by means of, for example, the operating lever, and is configured to perform switching control using this operating lever. The directional switching valve 28, like the directional switching valve 10 described in the prior art, operates the lifting cylinder of the earth removal plate 19 to raise and lower the earth removal plate 19 between the working position and the non-working position. It's getting old.

The hydraulic excavator according to this embodiment has the above-mentioned configuration, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, a recessed part 21A is provided at the rear lower side of the driver's cab 21, and a part of the radiator 6 etc. is accommodated in the recessed part 21A, so that the driver's cab 21 is connected to the machine room 3. At the same time, the directional control valve 28 for the attachment is located between the curved part 11A of the counterweight 11 and the hydraulic pump 5, and is attached to the curved part 11A, which is different from the conventional technology. As a result, there is no need to provide the directional control valve 28 for attachment in the driver's cab 21, and the living space in the driver's cab 21 can be prevented from becoming narrower due to the recessed portion 21A. Then, the driver's cab 21 has a turning radius R shown in FIG.
Because it can fit within the circle 20 of
1 can be prevented from colliding with surrounding structures, obstacles, etc., and accidents such as damage to the driver's cab 21 and injury to the driver can be avoided.

Further, since the directional switching valve 28 for the attachment is located between the counterweight 11 and the hydraulic pump 5 and is attached to the curved portion 11A of the counterweight 11, the directional switching valve 28 for the attachment is located between the counterweight 11 and the hydraulic pump 5. 5 and the oil storage tank 7, the piping can be shortened to facilitate piping work, and costs can be reduced.

Furthermore, by simply providing the concave portion 21A in the driver's cab 21, its basic external dimensions can be formed to be the same as those of conventional ones. Various effects can be achieved, such as being able to use conventional products as they are for windows and windows.

In the above embodiment, the direction switch 28 for the attachment operates the lifting cylinder of the earth removal plate 19.
It may also be used as a directional switching valve for an attachment that operates a breaker or the like that is attached in place of the bucket 15, and one or more directional switching valves 28 may be provided.

Furthermore, in the above embodiments, a hydraulic excavator has been used as an example, but the present invention is not limited thereto, and can also be applied to full swing type working machines other than hydraulic excavators.

[Effect of idea]

As detailed above, according to the present invention, the driver's cab is retreated to the machine room side to within the radius of the fleet of the upper rotating body, and the main directional control valve among the directional control valves is provided in the driver's cab, Since the directional switching valve for the attachment is mounted near the counterweight, there is no need to provide the directional switching valve for the attachment in the driver's cab, and the driver's cab can be moved backwards without narrowing the living space of the driver's cab. I can do it. Further, even when the upper revolving body is rotated in a narrow work site, accidents such as damage to the operator's cab can be avoided. In addition, various effects can be achieved, such as facilitating the piping work of the directional switching valve for the attachment.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention,
Figure 1 is an overall view of the hydraulic excavator, Figure 2 is a plan view of the upper revolving body shown in Figure 1 with the machine room cover and working equipment removed, and Figure 3 is the arrow shown in Figure 2. - direction sectional view, FIG. 4 is a right side view of FIG. 3 with main parts cut away, FIG. 5 is a left side view of FIG. 3, FIGS. 6 and 7 show the prior art, and FIG. 6
This figure is an overall view of the hydraulic excavator, and FIG. 7 is a plan view of the upper revolving body shown in FIG. 6 with the machine room cover, working equipment, etc. removed. 1... Lower traveling body, 2... Upper revolving body, 2A...
... Frame, 3 ... Machine room, 3A ... Machine room cover, 11 ... Counterweight, 12 ... Work equipment, 19 ... Earth removal plate, 21 ... Operator's cab, 21A ...
...Recessed portion, 22... Support member, 23, 24, 2
5, 26... Bed, 27... Main directional switching valve, 28... Attachment directional switching valve, R...
...Turning radius.

Claims (1)

[Scope of utility model registration request] an undercarriage body; an upper revolving body which is rotatably mounted on the undercarriage body and is provided with a machine room and a driver's cab located in the front side of the machine room; and a counterweight is provided on the rear side; In a full-swivel type work machine comprising directional switching valves for main and attachment provided on an upper revolving body, the operator's cab is retreated to the machine room side until within the turning radius of the upper revolving body, and the respective direction switching valves are switched. A full swing type work machine, characterized in that, among the valves, a main directional switching valve is provided in the operator's cab, and an attachment directional switching valve is mounted near the counterweight.