JPH032436Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a hydraulic working machine having a float attached to the body that can be rotated up and down by a hydraulic cylinder.

BACKGROUND OF THE INVENTION Hydraulic construction machines often work on soft ground. On such soft ground, the tracks or wheels may sink into the ground due to the shaking of the vehicle body during work, making it impossible to move after work, and eventually the lower part of the vehicle will come into contact with the ground and be towed. You can even get into a situation where you can't even escape. Therefore, when working on soft ground,
It is possible to lay a steel plate on the surface of the moving road so that the aircraft passes over the plate, or to make the suspension part float so that it does not sink to the ground, or to increase the width of the tracks and increase the ground pressure. Measures have been taken to prevent subsidence by lowering the However, with the first method, the aircraft can be used as is, but the iron plates must be carried to the work site, and the iron plates must be rearranged each time it is moved, which requires a lot of manpower and time. death,
The second method, which also lowered work efficiency, had a dedicated float type undercarriage, making it a special-purpose machine that could only be used on soft ground, making it difficult to work on normal ground. The cost was also high because of the special structure. The third method is to replace only the track with a larger width one, which reduces the ground pressure, so it is effective up to a certain degree of soft ground, but if the ground becomes softer than that, it will gradually sink during work, and the width of the track will decrease. Since the proportion of the vehicle is large, there is a drawback that the driving force is insufficient and the vehicle cannot run.

The purpose of this invention is to provide a traveling device that does not have the above-mentioned problems on soft ground.

Means for Solving the Problem The means of this invention taken to solve the above problems are as follows: (1) One end of a float having a boat-shaped lower surface is installed at the front and rear of the frame of the lower traveling body of a hydraulic working machine. The float is pivotably supported, and the float is movable up and down between the left and right tracks of the hydraulic working machine, and (b) a hydraulic cylinder is installed between a bracket provided on the upper surface of the float and a bracket on the frame body; C. When the hydraulic cylinder is extended, the float rotates around one end of the float that is pivotally supported on the aircraft body, and when the lower surface of the float contacts the ground, the float lifts and supports the aircraft body. It was configured as follows.

How it works On soft ground, the float is lowered using a hydraulic cylinder and supports part of the weight of the aircraft, so the ground pressure is significantly reduced and the tracks or wheels do not sink during work. In addition, even if the aircraft sinks too much to escape on its own, the boat-shaped float supports the aircraft, making it easy to escape by operating attachments or being towed. Also,
It can also absorb reaction forces during work, allowing stable work.

Additionally, on normal hard ground, the float is lifted to allow the vehicle to travel in exactly the same way as conventional vehicles.

Embodiment An embodiment of this invention will be described in detail in the case of a track-type hydraulic excavator based on the drawings.

1 is the upper revolving body of the hydraulic excavator, 2 is the lower traveling body, and the left and right crawler tracks 3 of the lower traveling body 2
In between, two floats 4 are installed, one at the front and one at the rear, to support the aircraft. The float 4 has a rectangular shape when viewed from the top, and the bottom surface has a boat shape with rounded front and rear ends, and its length is equal to the crawler track 3.
The length is from the front end of the frame body 5 to the front part of the frame body 5, and the width is slightly smaller than the distance between the inner sides of the left and right crawler belts 3 so that they do not come into contact even when the left and right crawler belts 3 rotate. A pair of left and right brackets 6 are fixed to the rear upper surface of the front float 4 and the front upper surface of the rear float 4, respectively. , the bracket 6 is
A pair of left and right brackets 8 are fixed at positions corresponding to
The float 4 is connected to the frame 5 so as to be pivotable up and down. Reference numeral 10 denotes a hydraulic cylinder for rotating the float 4, one end of which is rotatably supported by a pin 13 on a bracket 11 provided on the upper surface of the float 4, and the other end on a bracket 12 provided on the frame 5. ing. 14 is a boom of a hydraulic excavator, 15 is an arm, 16 is a bucket, and 17 is a hydraulic cylinder that operates these.

This invention is constructed as described above, and the case where it is actually used will be explained. The float 4 has one end connected to the bracket 8 of the frame body 5 by a bracket 6.
A hydraulic cylinder 10 is mounted between the frame body 5 and the frame body 5, and the hydraulic cylinder 10 can freely rotate up and down. When there is no need to use the float 4, when the hydraulic cylinder 10 is contracted and the float 4 is pulled upward, the lower part of the float 4 is placed in the middle part of the lower traveling body 2, that is, in the frame body 5. Since it is located above the intermediate lower side, the bottom of the float 4 will not be scraped by an obstacle. If the crawler track 3 sinks into the ground and becomes unable to move while working on soft ground or while driving, extend the hydraulic cylinder 10 and lower the float 4 to the ground, and then use the float 4 to lower the float 4 slightly. Try to lift the aircraft. Until now, the aircraft was supported only by left and right tracks 3, but now it is mainly supported by float 4.
Since the float 4 is supported by the float 4, the average ground pressure supporting the fuselage is reduced.Furthermore, since the lower end of the float 4 has a curved surface, the resistance of the earth and sand to movement is reduced. In this state, the aircraft can escape from the soft ground by operating the hydraulic cylinder 17 to operate the boom 14, arm 15, etc., or by moving the aircraft forward or backward by towing it with a wire rope using a bulldozer. be able to. Furthermore, even if the ground is not very soft, if the work is done in the same position for a long time, the crawler tracks 3 will gradually sink due to the rocking of the aircraft. In such a case, lower the float 4 to the ground beforehand,
The fuselage is supported not only by crawler tracks 3 but also by floats 4. That is, the float 4 is made to function as an outrigger. Since the ground contact area increases and the ground pressure becomes extremely small, the crawler track 3 will not sink even when working in the same position for a long time.
Able to perform stable work. In addition, especially during backhoe work, for example, a very large load is applied only to the front part of the crawler track 3, and the track 3 sinks in this part, not only making the aircraft unstable but also causing the lower traveling body 2 to Unreasonable load is applied. In such a case, by lowering the float 4 to the ground in advance so that it can take part of the load on the lower traveling body 2, you can work in a stable state until the end, and also There is no possibility that the traveling body 2 will be damaged.

Effects of the invention As mentioned above, this invention is based on the fact that a float with a boat-shaped bottom is installed between the left and right tracks or wheels at the front and back of the frame of the lower traveling body so that it can be rotated up and down by a hydraulic cylinder. During work, by lowering the float to the ground, the ground contact pressure is greatly reduced, preventing the aircraft from sinking, and allowing work to be carried out on soft ground with some grace. In addition, if the aircraft is sinking due to soft ground and it is difficult to drive, lower the float to the ground, raise the aircraft with the float, and tow it by operating the attachment or by using a bulldozer. Because it can be moved, you can work safely even on soft ground. Furthermore, when there is no need to use the float on normal ground, the float can be lifted upward, allowing the vehicle to travel without being hindered by obstacles. In addition, especially in operations where the aircraft tends to shake, such as during backhoe operations,
By lowering the float to the ground, work can be carried out in a stable state until the end, and the load on the undercarriage can be distributed, extending the life of the aircraft.

[Brief explanation of the drawing]

The drawings all show examples in which the embodiment is applied to a track-type hydraulic excavator; FIG. 1 is an overall front view, FIG. 2 is a plan view of the main parts of the invention, and FIG. FIG. 2... Lower traveling body, 3... Crawler track, 4... Float, 10... Hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] One end of each float having a boat-shaped lower surface is pivotally supported at the front and rear of the body of the hydraulic working machine, and the float is movable up and down between the left and right tracks of the hydraulic working machine, and the upper surface of the float is A hydraulic cylinder is installed between the bracket provided on the frame body and the bracket provided on the frame body, and when the hydraulic cylinder is extended, the float rotates about one end of the float pivotally supported on the fuselage body, 1. A float device for a hydraulic working machine, characterized in that the float lifts and supports a machine body when the lower surface side of the float comes into contact with the ground.