JPH0868068A - Bucket for hydraulic shovel - Google Patents

Abstract

PURPOSE: To improve the accuracy of the execution of works by connecting the lateral plate of a bottom plate and a vertical plate by a curved section while the underside of the bottom plate and the underside of a tooth are formed in the same surface and specifying the ratio of the length of the underside of the bottom plate to the length of the upper and lower sections of the opening section of a bucket. CONSTITUTION: Since a bucket body 10 is formed of a pair of side plates 11, a rear plate 12 and a bottom plate 13, the number of parts is reduced. B/A>=-0.55 holds in the length A of the underside 13a of the bottom plate 13 and the length B of the upper and lower sections of the opening section of a bucket 10, and the length of the bottom plate 13 is lengthened and the accuracy of finishing of linear excavation and correction operation is improved. Intrusion to an excavating surface and a correcting surface of the rear end section of a lateral plate 17 is prevented by the curved section 19 of the rear end section of the lateral plate 17, thus enhancing the accuracy of finishing. Smooth linear excavation is enabled because the underside 13a and the undersides 20a of teeth 20 are formed in approximately the same surface while excavation resistance is reduced because the projecting sections 22 of the bottom plate 13 are projected among the adjacent teeth 20. Accordingly, the bucket can be manufactured easily, and the accuracy of finishing and working speed can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket mounted on the tip of an arm of a hydraulic shovel for excavation work and leveling work.

[0002]

2. Description of the Related Art In a hydraulic excavator, a boom is mounted on a vehicle body so as to be vertically swingable by a boom cylinder, an arm is swingably mounted on the boom by an arm cylinder, and a bucket is vertically swung by a bucket cylinder at an end of the arm. It is known that it is freely attached.

The above-described hydraulic excavator mainly swings a boom and an arm up and down, and pivots a bucket up and down to excavate earth and sand. However, the bucket is used to adjust the slope, There are times when rectification work such as compaction is performed.

As described above, as a bucket used for both excavation work and leveling work, as shown in Japanese Utility Model Laid-Open No. 4-33749, one straight flat plate is attached below the bottom plate, and the straight flat plate is attached. It is known that the lower surface and the lower surface of the tooth are the same surface.

With this bucket, since the lower surface of the tooth and the lower surface of the flat plate are the same surface, no unevenness is caused by the tooth when performing the adjusting work, so that the finishing accuracy of the adjusting work can be improved.

[0006]

Such a bucket has a bucket body composed of a pair of side plates, a back plate bent in a substantially C-shape, and a bottom plate, a straight flat plate fixed between the pair of side plates, and the bottom plate. Since it consists of a tooth attached to the front end edge of and the bracket fixed to the upper part of the bucket body, the number of parts is large and the manufacturing is troublesome, and since it becomes heavy, the force for moving the bucket up and down becomes large.

Therefore, an object of the present invention is to provide a bucket for a hydraulic excavator which can solve the above-mentioned problems.

[0008]

A bucket body 10 comprising a pair of side plates 11, 11, a back plate 12 and a bottom plate 13, a plurality of teeth 20 attached to a lip plate 16 fixed to the front edge of the bottom plate 13, A bracket 30 fixed to the upper portion of the front bucket body 10, the bottom plate 13 being substantially L-shaped from the horizontal plate 17 and the vertical plate 18, the vertical plate 18 and the back plate 12 being continuous, and composed of the horizontal plate 17. A bucket for a hydraulic excavator in which the lower surface 13a of the bottom plate 13 and the lower surface 20a of the tooth 20 are flush with each other.

[0009]

[Operation] The finishing accuracy during straight line excavation and leveling work can be improved. Since the pair of side plates 11, back plate 12 and bottom plate 13 form the bucket body 10, the number of parts can be reduced and manufacturing can be simplified. Weight is reduced.

[0010]

[Example] As shown in Fig. 1, a boom 2 is mounted on a revolving superstructure 1 of a hydraulic excavator by a boom cylinder 3 so as to be vertically swingable, and an arm 4 is vertically moved by an arm cylinder 5 at a tip portion of the boom 2. The bucket 6 is mounted so as to be swingable, and the bucket 6 is mounted on the tip of the arm 4 by a bucket cylinder 7 so as to be vertically rotatable.

As shown in FIGS. 2 and 3, the bucket 6 is composed of a bucket body 10, a tooth 20 and a bracket 30. The bucket body 10 is composed of a pair of side plates 11, 11, a back plate 12 and a bottom plate 13 and has a cross section of approximately L. The side plate 14 is shaped like a letter and extends along the opening edge (front end edge) of the side plate 11.
The side cutter 15 is fixed to the lower portion of the side plate 14 by a bolt, and the lip plate 16 is fixed to the opening edge (front end edge) of the bottom plate 13, and the tooth 20 is attached to the lip plate 16. The bottom surface 20a of the tooth 20 is substantially flush with the bottom surface 13a of the bottom plate 13.

The bottom plate 13 is formed by integrally connecting a horizontal plate 17 and a vertical plate 18 via a curved portion 19, and the horizontal plate 1
At the front end of 7, concave portions 21 and projecting portions 22 are formed alternately and continuously.

The lip plate 16 is welded to the upper surface of the front edge of the horizontal plate 17 of the bottom plate 13 as shown in FIG. 4, and the tooth 20 is fitted and fixed to the lip plate 16, and the tooth 20 is fixed to the horizontal plate 17. The width is slightly narrower than the recess 21,
The pointed portion 23 of the tooth 20 is welded to the concave portion 21 and protrudes more forward than the lateral plate 17 and the lip plate 16 of the bottom plate 13.

The bracket 30 is fixed to the upper portion of the bucket body 10 as shown in FIG.
And a link connecting hole 32 is formed.

The bottom plate 13 is thicker than the back plate 12 so as not to be deformed during compaction, and the length A of the linear portion of the bottom plate 13 is (the length of the lateral plate 17). Is A with respect to the vertical length B of the opening of the bucket body 10.
/B≧0.55.

Because of this, as shown in FIG. 5, the bottom surface 13a of the bottom plate 13 of the bucket 6 is brought into contact with the excavation surface such as the ground surface or slope, and the bucket 6 is moved in that state in parallel to perform a straight excavation work. In doing so, since the lower surface 13a of the bottom plate 13 of the bucket 6 and the lower surface 20a of the sheath 20 are the same surface, smooth straight line excavation can be performed, and finishing accuracy can be improved. At this time, since the projection 22 of the bottom plate 13 projects between the adjacent teeth 20, the excavation resistance can be reduced.

Further, as shown in FIG. 6, the lower surface 13a of the bottom plate 13 of the bucket 6 is brought into contact with the leveled front surface such as the ground surface or a slope, and the boom cylinder 3 is expanded and contracted in this state to move the bucket 6 up and down. Thus, when the weight of the boom 2, the arm 4, the bucket 6 and the like and the hydraulic pressure of the boom cylinder 3 are used to roll and adjust to a flat surface, the accuracy of finishing can be improved.

At this time, as shown in FIG. 7, if the lower surface 13a of the bottom plate 13 of the bucket 6 is slightly upward with respect to the horizontal direction and the bucket 6 is moved in the direction of the arrow so as to be compacted, the tooth 20 will eat into the earth and sand. Since the curved portion 19 prevents the rear end of the lateral plate 17 of the bottom plate 13 from being caught in the front surface, the accuracy of finishing can be improved.

Next, a modified example of each part will be described. As shown in FIG. 8, the chamfered portion 13b is formed on the lower surface of the front end portion of the bottom plate 13 to reduce excavation resistance.

As shown in FIG. 9, the projection 22 of the bottom plate 13 has a pointed shape to reduce excavation resistance, and in this case also, the chamfer 13b is formed on the lower surface of the projection 22.

As shown in FIG. 10, the horizontal plate 17 of the bottom plate 13 is formed.
The rear end surface of the lip plate 16 is welded to the front end surface, and the front-rear direction intermediate portion 16a of the lip plate 16 is bent in a dogleg shape so that the front end portion is higher than the rear end portion. The lower surface 20a and the lower surface 13a of the bottom plate 13 are made flush with each other by fitting and fixing 20.

In this way, the lower surface 16b of the front and rear direction intermediate portion 16b of the lip plate 16 is inclined with respect to the vertical, so that excavation resistance can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS. 11 and 12.
It will be described based on. The plate 40 is fixed over the lower surfaces 20b near the front ends of the plurality of teeth 20.

In this way, as shown in FIG. 13, the bottom surface 13a of the bottom plate 13 has a certain angle with respect to the excavation surface such as the ground surface or the slope, and only the plate 40 is in contact with the excavation surface for linear excavation. Therefore, the excavated surface can be finished with high precision, and even if the angle changes to α ₁ , α ₂ , and α ₃ , the finishing precision is not affected. Therefore, the operation of the boom 2, arm 4, and bucket 6 It is fast and efficient.

As shown in FIGS. 14 and 15, the plate 40 may be fixed over the upper surface 20c near the tip of the tooth 20.

[0026]

According to the bucket of the first aspect, the finishing accuracy at the time of straight line excavation and leveling work can be improved, and the pair of side plates 11, back plate 12 and bottom plate 13 make the bucket body 10
As a result, the number of parts is reduced and manufacturing is easy, and the weight is light and the bucket can be moved up and down with a small force.

According to the bucket of the second aspect, the length of the lower surface 13a of the bottom plate 13 becomes long, and the finishing accuracy and the working speed can be improved.

In the bucket of claim 3, since the rear end of the horizontal plate 17 of the bottom plate 13 is curved, the rear end of the horizontal plate 17 is excavated by the curved portion 19 during straight line excavation and straightening work. Finishing accuracy is improved without digging into the surface or front surface.

According to the bucket of the fourth aspect, since the projection 22 of the lateral plate 17 of the bottom plate 13 projects between the adjacent teeth 20, the excavation resistance can be reduced.

According to the bucket of claim 5, excavation resistance can be reduced because the lower surface 16b of the middle portion of the lip plate 16 in the front-rear direction is inclined with respect to the vertical.

According to the bucket of claim 6, the bottom surface 13a of the bottom plate 13 has a certain angle with respect to the excavation surface and the plate 40 is in contact with the excavation surface so that the straight excavation work can be performed and the finishing accuracy can be improved. Even if the angle varies a little, the finishing accuracy is not affected, so that the bucket operating speed can be increased and the work can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a front view of a working machine portion of a hydraulic excavator.

FIG. 2 is a front view of the bucket showing the first embodiment of the present invention.

FIG. 3 is a perspective view of the bucket according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a tooth mounting portion.

FIG. 5 is an explanatory diagram of a straight line excavation work.

FIG. 6 is an explanatory diagram of a correction work.

FIG. 7 is an explanatory diagram of a bucket state during the adjustment work.

FIG. 8 is a front view of the bucket in which the lower surface of the front end portion of the bottom plate is inclined.

FIG. 9 is a perspective view of the bucket in a state where the protrusion of the bottom plate has a pointed shape.

FIG. 10 is a cross-sectional view of the tooth mounting portion with the lip plate in a dogleg shape.

FIG. 11 is a front view of the bucket showing the second embodiment of the present invention.

FIG. 12 is a perspective view of a bucket showing a second embodiment of the present invention.

FIG. 13 is an explanatory diagram of a straight line excavation work using a plate.

FIG. 14 is a front view of the bucket with the plate attached to the upper surface of the tooth.

FIG. 15 is a perspective view of a bucket having a plate attached to the upper surface of the tooth.

[Explanation of symbols]

 10 ... Bucket body 11 ... Side plate 12 ... Back plate 13 ... Bottom plate 13a ... Lower surface 16 ... Lip plate 17 ... Horizontal plate 18 ... Vertical plate 19 ... Curved part 20 ... Tooth 20a ... Lower surface 30 ... Bracket

Claims (6)

[Claims] 1. A bucket body 10 comprising a pair of side plates 11, 11, a back plate 12 and a bottom plate 13, a plurality of teeth 20 attached to a lip plate 16 fixed to a front edge of the bottom plate 13, and the bucket body 10. The bottom plate 13 is substantially L-shaped from the horizontal plate 17 and the vertical plate 18, and the vertical plate 18 and the rear plate 12 are continuous to each other.
Lower surface 13a of bottom plate 13 and lower surface 20 of tooth 20
A bucket for a hydraulic excavator, characterized in that a is substantially on the same plane. 2. The relationship between the length A of the lower surface 13a of the bottom plate 13 and the vertical length B of the opening of the bucket body 10 is expressed by B / A ≧
The hydraulic excavator bucket according to claim 1, wherein the bucket is 0.55. 3. A horizontal plate 17 and a vertical plate 18 constituting the bottom plate 13.
The method according to claim 1 or 2, wherein the two are integrally connected via a curved portion 19.
Excavator bucket as described. 4. A recess 21 is formed at the tip of the lateral plate 17 of the bottom plate 13.
The bucket for a hydraulic excavator according to claim 1, 2 or 3, wherein the bucket 22 has an uneven shape having a protrusion 22 and the protrusion 22, and the protrusion 22 is projected between adjacent teeth 20. 5. The front-rear intermediate portion 1 of the lip plate 16
6a has a substantially doglegged shape in which the front end is higher than the rear end,
The rear end of the lip plate 16 is provided with a horizontal plate 17 of the bottom plate 13.
The tooth 20 is fixed to the front end surface, and the tooth 20 is fixed to the front end portion of the lip plate 16 to fix the lower surface 13a of the bottom plate 13 and the tooth 20.
The lower surface 20a of the lip plate 1 is substantially the same surface, and the lip plate 1
The bucket of the hydraulic excavator according to claim 1, 2 or 3 or 4, wherein the lower surface 16b of the intermediate portion of the front-rear direction 6 is inclined with respect to the vertical. 6. The horizontal plate 40 is fixedly attached to the tip end portions of the plurality of teeth 20.
Excavator bucket as described.