JPH03244717A - Small back hoe - Google Patents

Abstract

PURPOSE:To prevent earth and sand from being accumulated on a hydraulic connecting mechanism etc., by fixing to a portion of the end side of a boom a guide plate for receiving and guiding the earth and sand falling toward near the center of turning movement of a turning stand from the bucket of an excavation working device being held in its folded position. CONSTITUTION:A turning stand 2 is loaded on a crawler type traveling machine body 1 and an operating portion 3 and an oil tank 4 are disposed parallel to each other on the upper front side of the turning stand 2 and also an excavation working device 6 is connected between the operating portion 3 and the oil tank 4. A rotary joint 21 for hydraulic piping is disposed near the center position of turning movement of the turning stand 2 located between boom-connecting brackets 7 each of which is fixed to the turning stand 2. A guide plate 23 for receiving and guiding earth and sand falling from the bucket 10 of the excavation working device 6 toward near the center of turning movement of the turning stand 2 is fixed to a portion of the end side of a boom 8. Even when earth and sand in the bucket 10 fall off, the guide plate 23 and a tilting guide plate 25 cause the earth and sand to fall downward from the front side of the pivotally supporting portion of the boom 8, thereby preventing the earth and sand from falling onto the pivotally supported part of the boom and the rotary joint 21 etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention includes a swivel base that is fully rotatable around a vertical axis on a traveling machine base, and an oil tank and an oil tank disposed on the top side of the swivel base. The base end of the boom of the excavation work device is pivotally connected to the operating part at a location near the center of rotation, and
The present invention relates to a small bank hoe configured such that, in the maximum folded position of the excavating device, the bucket is located approximately on the center of rotation, and the excavating device is located within the outer end locus of the turning base in plan view.

[Conventional technology]

Conventionally, in the above-mentioned small backhoe, a sensor is provided to detect the attitude of the bucket in the folded attitude, and the packet is detected based on the detection result of this center, as shown in Japanese Patent Application Laid-Open No. 63-277324. The structure was designed to keep it in a horizontal position and prevent soil from falling.

(Problem to be Solved by the Invention) However, according to the above conventional structure, when the bucket is retracted and swung to the folded position with dirt accumulated in the bucket,
Some of the soil may spill downward, and
A certain distance is provided between the boom and the driving section for safety to prevent collisions, so the earth and sand that fell from this height could accumulate on the pivot of the boom and impede its swinging. In addition, there was a risk that the glue switch for detecting the swing position or the hydraulic piping could be damaged.

In addition, the rock joint for the hydraulic piping, which is disposed above the center of rotation, is also covered with dirt, causing damage and other problems.

The present invention aims to eliminate the above-mentioned disadvantages through rational structural improvements.

(Means for Solving the Problems) A characteristic configuration of the present invention is that the agricultural tractor described at the beginning receives earth and sand falling from the packet of the excavating device in the folded position toward the vicinity of the turning center. A guide plate 5 for stopping and guiding the boom is fixed at a location on the base end side of the boom.

[Function] Even if some of the earth and sand spills out when the excavation device is folded in and operated with earth and sand accumulated in the container, it will be caught by the guide plate and the pivot portion of the boom will be removed. It is guided downstream and falls downward.

[Effects of the Invention] As a result, earth and sand do not fall on and accumulate on the pivot portion of the boom, the hydraulic connection mechanism, etc. disposed above the center of rotation, and damage can be prevented.

In order to obtain the same effect as above, it is possible to provide a guide plate on the side of the aircraft such as the operating section or tank, but in this way, it is possible to allow the swing of the boom and eliminate the risk of collision. , it is necessary to provide a certain gap between the boom and the guide plate, and it is not possible to sufficiently prevent the earth and sand from falling downward.However, in the present invention, a rational structure in which the guide plate is attached to the boom is used. An effective soil receptacle without these drawbacks can perform its function.

Example] Embodiments of the present invention will be described below based on the drawings.

FIGS. 3 and 4 show a small bank hoe according to the present invention. This hackhow is a crawler type traveling aircraft (1)
A swivel base (2) is mounted on the top that can rotate freely around the vertical axis (Y), and a driving unit (3) and an oil tank (4) are installed in parallel on the front side of the swivel base (2). A driving unit (5) is disposed at the rear, and a digging device (6) is connected between the driving unit (3) and the oil tank (4).

The excavation work device (6) includes a boom (8) pivotally connected to a bracket (7) fixed to the swivel table (2) so as to be able to swing up and down around a horizontal axis, and a tip of the boom (8). It consists of an arm (9) pivotally connected to the arm (9) so as to be swingable around the horizontal axis, and a packet (10) pivotally connected to the tip of the arm (9). 10) are boom cylinder (15) and arm cylinder (16), respectively.
and a packet cylinder (17), each of which can be oscillated separately.

As shown in FIGS. 1 and 2, a hydraulic pump (not shown) in the driving part (5) is located near the center of rotation between the boom connection brackets (7) of the swivel base (2). and hydraulic motors (ill, ), (Mz) of the crawler traveling device (18).
) and the hydraulic cylinder (20) for the dozer (19), etc., is provided with a low rigidity joint (21) for the hydraulic piping. It is inserted and installed from above through a round hole (22), and a gap is formed so that hydraulic piping can be connected from above.

In this bankhoe, when the excavating device (6) is in the maximum folded position, the bucket (10) is located approximately on the center of rotation, and the excavating device (6) is located outside the rotating base (2) when viewed from above. It is designed so that the maximum turning radius can be reduced by keeping it within the end trajectory.

Then, a guide plate (23) that receives and guides earth and sand falling from the Bakken I-(10) of the excavating device (6) in the folded position toward the vicinity of the center of rotation is attached to the base of the boom (8). It is fixed at the end.

In other words, as shown in FIG. 1, the mounting boss member (24) is welded to the proximal front side of the boom (8), and the pair of left and right guide plates (23), (23) are attached to the boss member. It is bolted to (24). Further, a diagonal guide plate (25) is installed in a downwardly tilted position over the upper front end of the driving portion (5) and the bracket (7).

With this configuration, even if the earth and sand in the bucket (10) spills out in the maximum beam bending posture, the guide plate (23) and the inclined guide plate (25) will keep the boom (8) It can be dropped downward from the front side of the branch, and the boom pivot part and the
1) It can prevent this from happening.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of a small hack hoe according to the present invention, in which Fig. 1 is a front view of the main parts, Fig. 2 is a plan view of the rotary joint installation part, Fig. 3 is an overall plan view, and Fig. 4 is It is an overall side view. (1)...Traveling machine base, (2)...Swivel base, (3)...Driving section, (4)...
Oil tank, (6)...Drilling work device,
(8)...Boom, (10)...Bucket, (23)...Guy 11 counters.

Claims (1)

[Claims] A swivel base (2) that is fully rotatable around a vertical axis (Y) is mounted on a traveling machine base (1), and an oil tank ( The proximal end of the boom (8) of the excavating device (6) is pivotally connected between the excavating device (6) and the driving section (3) so as to be able to rise and fall freely. (6) In the maximum folded position, the bucket (10
) is located approximately on the center of rotation, and in plan view, the excavating work device (6
) is configured to fit within the outer end locus of the swivel base (2), and the small backhoe falls from the bucket (10) of the excavating device (6) in the folded position toward the vicinity of the center of rotation. A small backhoe in which a guide plate (23) for receiving and guiding earth and sand is fixed at the base end side of the boom (8).