JPH06219322A - Slope work machine - Google Patents

Abstract

(57) [Summary] [Purpose] The posture of the upper revolving structure can be controlled horizontally, so that the engine will not burn even on steep slopes, and the vertical direction will be maintained even when the crawler is placed sideways on a slope. Provide a work machine for sloping ground capable of excavating. [Composition] An inclinometer 12 which detects an inclination angle of the upper swing body 3 with respect to a horizontal plane and outputs a detection signal, and the inclinometer 12
The cylinder 11 for driving the upper swing body 3 is provided so that the posture of the upper swing body 3 is oriented horizontally according to the detection signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine such as a hydraulic excavator having a crawler, and more particularly to a working machine for sloping ground for working on a sloping ground such as a forest or a bank.

[0002]

2. Description of the Related Art Since forests occupy about 60% of the national land in Japan and there is a high demand for timber, it is considered that domestic timber will be utilized in the future, and further effective utilization is expected. ing. However, except for Hokkaido, most of the forest areas in Japan are slopes with a slope of 20 degrees or more, so
If you do not use a working machine that can excavate and transport on sloping ground,
It takes a lot of manpower and time to cut out wood. Therefore, a work machine such as a hydraulic excavator having a crawler has been conventionally used to perform work on such a sloping ground. Recently, FIGS. 4 and 5 show operability on a sloping ground. Work machines for sloping ground have been proposed.

In these drawings, reference numeral 1 generally indicates a hydraulic excavator, 2 is a crawler forming a lower traveling body, 3 is an upper revolving structure which is disposed on the crawler 2 and can revolve, and 4 is an upper revolving structure. The cab 5 supported by 3 also shows the front which is also supported by the upper revolving superstructure 3 to form a working machine, but the cab 4 can change its posture with respect to the upper revolving superstructure 3. Therefore, if the posture of the driver's cab 4 is kept substantially horizontal on the slope, the driver can operate safely and easily without feeling the slope.

That is, in the hydraulic excavator 1, since the upper revolving structure 3 is kept horizontal as shown in FIG. 4 on a flat ground, it is not necessary to tilt the operator cab 4 with respect to the upper revolving structure 3, but the sloping ground At the time of excavating the front surface, as shown in FIG. 5, by raising the rear part of the cab 4 and lowering the front part, the posture of the cab 4 becomes substantially horizontal, and it becomes easy to operate.

[0005]

However, in the conventional work machine for sloping ground, the above-described conventional working machine for sloping ground is operated according to the sloping state.
Since only the attitude is controlled, the engine held by the upper-part turning body 3 tilts on a sloping ground, so that engine oil does not circulate sufficiently on a steep sloping ground, which may cause seizure of the engine. was there. Further, in the working machine described above, when the crawler 2 is sideways with respect to the slope and the vehicle body is tilted to the left or right, even if only the posture of the operator's cab 4 is kept horizontal, the front 5 having the boom, the arm and the like has a vertical plane. I'm still leaning against
There was a problem that vertical excavation could not be performed.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to prevent the engine from being seized even on a steep slope, and to maintain the vertical direction even when the crawler is lateral to the slope. It is to provide a work machine for sloping ground capable of excavating.

[0007]

The above object of the present invention is to provide an inclinometer which detects an inclination angle of an upper revolving structure with respect to a horizontal plane and outputs a detection signal, and the upper revolving structure according to the detection signal of the inclinometer. And an attitude control means for driving the upper revolving structure so that the attitude is horizontally oriented.

[0008]

According to the above-mentioned means, the upper revolving structure can be maintained in a horizontal posture on a sloping ground, so that the engine oil circulation can be prevented even on a steep sloping ground, engine seizure can be prevented, and the crawler It is possible to drive the front along the vertical plane even when it is lateral to the slope.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is an explanatory view of essential parts of a hydraulic excavator as an embodiment, FIG. 2 is an explanatory view showing a state in which the upper swing body of the hydraulic excavator is attitude-controlled on a sloping ground, and FIG. 3 is a schematic view of the upper swing body of the hydraulic excavator. It is a block diagram showing an attitude control system, and the same reference numerals are given to the portions corresponding to those in FIGS.

In FIGS. 1 and 2, a hydraulic excavator generally designated by reference numeral 1 has a pair of left and right crawlers 2.2 forming an undercarriage independently suspended, and both crawlers 2.2 are connected to a connecting bar 6 and a plate. It is connected with the spring 7. Then, a lower structure 10 having a pivot shaft 9 erected is mounted on the leaf spring 7 via a pin joint 8 such as a universal joint, and between the lower structure 10 and both crawlers 2.2. There are four cylinders 11 interposed in the front and rear and in a dispersed manner.

Further, an inclinometer 12 for detecting an inclination angle with respect to a horizontal plane and outputting a detection signal is attached to the upper revolving structure 3 which can revolve around the revolving shaft 9, and as shown in FIG. When the driver turns on the operation instruction device 13 on a sloping ground, the computing device 14 computes the amount of expansion and contraction of each cylinder 11 required to make the posture of the upper swing body 3 horizontal based on the detection signal of the inclinometer 12. However, the hydraulic drive device 15 drives each cylinder 11 individually according to the calculation result. That is, since the hydraulic drive unit 15 can individually extend or contract each cylinder 11 by controlling the supply amount of the pressure oil, the hydraulic drive unit 15 is driven by a drive signal according to the calculation result of the calculation unit 14. Is output, each cylinder 11 can be appropriately expanded and contracted to make the posture of the lower structure 10 horizontal, and accordingly, the revolving shaft 9 stands upright and the posture of the upper revolving structure 3 also becomes horizontal. .

For example, as shown in FIG. 2, on an inclined ground having an inclination angle of θ with respect to a horizontal plane, this hydraulic excavator 1 is operated with one crawler 2 on the mountain side and the other crawler 2 on the valley side. In this case, the two cylinders 11 on the mountain side are appropriately contracted so that the remaining two cylinders 11 on the valley side are compressed.
By appropriately extending, the lower structure 10 mounted on the leaf spring 7 can be placed in a horizontal posture via the pin joint 8, so that the upper revolving structure 3 can be maintained in a horizontal posture during the work. Can be done. As a result, the upper swing body 3
Since the engine (not shown) held in the engine does not tilt, the engine oil circulation is not hindered even on a steep slope, and seizure of the engine can be prevented. Further, if the upper revolving structure 3 is maintained in a horizontal posture, as shown in FIG. 2, even when the crawler 2 is sideways with respect to the slope and the vehicle body is tilted to the left or right, a figure having a boom, an arm, etc. Since the front (not shown) can be driven along the vertical plane, vertical excavation can be performed. Furthermore, since the posture of the driver's cab (not shown) can be kept horizontal in accordance with the posture control of the upper swing body 3, the driver can operate safely and easily without feeling the inclination.

If it is desired to excavate in a direction perpendicular to the slope of the sloping ground, the operation instructing device 13 may be turned off to return the upper swing body 3 to a posture parallel to the slope.

Further, the hydraulic excavator 1 on a sloping ground
2 is 90 degrees different from that of FIG. 2, and even when the vehicle body is tilted back and forth, by appropriately contracting the two cylinders 11 on the mountain side and appropriately expanding the remaining two cylinders 11 on the valley side, It goes without saying that the posture of the upper swing body 3 can be controlled horizontally.

[0015]

As described above, since the working machine for sloping ground according to the present invention can horizontally control the posture of the upper swing body based on the detection signal of the inclinometer, it has been a concern in steep sloping ground. This has the excellent effect of preventing engine seizure and enabling vertical excavation even when the crawler is on the slope sideways.The posture of the driver's cab can also be controlled horizontally with the upper revolving structure. Therefore, good operability can be expected.

[Brief description of drawings]

FIG. 1 is an explanatory view of essential parts of a hydraulic excavator as an embodiment.

FIG. 2 is an explanatory diagram showing a state in which the upper swing body of the hydraulic excavator shown in FIG. 1 is attitude-controlled on a sloping ground.

3 is a block diagram showing a posture control system of an upper swing body of the hydraulic excavator shown in FIG.

FIG. 4 is a side view of a conventionally proposed hydraulic excavator.

5 is an explanatory diagram showing a state in which the attitude of the operator's cab of the hydraulic excavator shown in FIG. 4 is controlled on a sloping ground.

[Explanation of symbols]

 1 hydraulic excavator 2 crawler 3 upper revolving structure 6 connecting bar 7 leaf spring 8 pin joint 9 revolving shaft 10 lower structure 11 cylinder 12 inclinometer

Front page continuation (72) Inventor Ryuji Takada 650, Kazunachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory

Claims (3)

[Claims] 1. A pair of crawlers forming an undercarriage, an upper revolving structure disposed on the crawlers and capable of revolving, a driver seat and an engine provided on the upper revolving structure, and the upper revolving structure. In a working machine for sloping ground, which is supported and forms a working machine, and which performs work on a sloping ground, an inclinometer that detects a tilt angle of the upper revolving superstructure with respect to a horizontal plane and outputs a detection signal, and this inclinometer. A work machine for sloping ground, comprising: attitude control means for driving the upper revolving structure so as to horizontally orient the upper revolving structure according to a detection signal. 2. The work for sloped land according to claim 1, wherein the attitude control means is formed by four cylinders arranged in a dispersed manner between the upper revolving structure and the crawler. machine. 3. The work machine for sloping ground according to claim 1, wherein the pair of crawlers are connected by using a leaf spring and a pin joint.