JP2002180493A - Working device of hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excavated matter such as sediment from making contact with a bucket cylinder or the like via an opening in the end of an arm by providing a cover member at the opening. SOLUTION: The cover member 34 for cover the opening 24 which opens between right and left bucket mounting parts 13A from excavated matter such as sediment or the like excavated by means of a bucket 14 is provided at the lower plate 21 of an arm 13 and a flexible plate 38 which is deflected upon abutting against the bracket 14C of the bucket 14 is mounted on the fixed plate 35 of the cover member. Thus, during the operation of excavating sediment and the like, the excavated matter in the bucket 14 is prevented from making contact with components such as bucket links 15 and 16, the bucket cylinder 19, and connecting pins 26 and 27 via the opening 24 of the arm 13 to protect these sliding parts for enhanced durability and reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic shovel working device suitably used for excavating earth and sand.

[0002]

2. Description of the Related Art In general, a hydraulic excavator used for excavation work such as earth and sand is provided with a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a vertically movable upper revolving body. And a working device provided.

A conventional hydraulic excavator of this type will be described with reference to FIGS. 9 to 11. FIG.

In the drawing, reference numeral 1 denotes a lower traveling body of a hydraulic shovel, 2
Is an upper revolving superstructure 2 that is rotatably mounted on the lower traveling superstructure 1
A cab 4 is provided on the revolving frame 3 of the upper revolving superstructure 2.
A building cover 5, a counterweight 6, and the like are provided. In addition, a working device 11 described below is attached to the front side of the revolving frame 3 so as to be able to move up and down.

A working device 11 is provided on the front side of the upper swing body 2 so as to be able to move upward and downward. The working device 11 is a boom having a base end side provided so as to be able to move upward and downward on the front side of the swing frame 3. 12, an arm 13 rotatably provided at the distal end side of the boom 12, a backhoe type bucket 14 rotatably provided at the distal end side of the arm 13, an arm 13, and a bucket cylinder 19 described later. The first provided between
Bucket link 15 and the first bucket link 15
Bucket link 16 provided between the swing frame 3 and the boom 12, a boom cylinder 17 provided between the turning frame 3 and the boom 12, and an arm cylinder provided between the boom 12 and the arm 13. 18 and a bucket cylinder 19 provided between the arm 13 and the bucket links 15 and 16.

Here, as shown in FIGS. 10 and 11, the arm 13 is composed of an upper plate 20, a lower plate 21 and left and right side plates 2.
The upper plate 20 and the lower plate 21 are provided with substantially U-shaped notches 20A and 21A, respectively, at the distal ends of the upper plate 20 and the lower plate 21. And
Between the upper plate 20 and the lower plate 21, for example, a notch 20A,
A substantially U-shaped curved inner plate 23 is fixed along the outer edge side of the inner plate 21A, and a space located inside the inner plate 23 is an upper plate 2.
0 and the lower plate 21 to form an opening 24 that opens upward and downward and that opens toward the distal end of the arm 13. As a result, the left and right bucket mounting portions 13A, 13B extending bifurcated with the opening 24 interposed therebetween are provided on the distal end side of the arm 13.
A is provided.

The bucket 14 is formed in a substantially box shape by a plurality of steel plates or the like, and has a bottom plate 14A which is formed to be concavely curved, and side plates 14B, which are fixed to both left and right sides of the bottom plate 14A. 14B and left and right brackets 14C and 14C which are erected at intervals on the base end side of the bottom plate 14A.
Are pin-coupled to the respective bucket mounting portions 13A of the arm 13 through the holes.

The first link 15 of the bucket links 15 and 16 has one end connected to the distal end of a rod 19B that extends and contracts from a tube 19A of the bucket cylinder 19 using a connecting pin 26, and the other end connected to the other end. It is connected to the arm 13 using another connecting pin 27. Further, the second bucket link 16 has a connecting pin 2 at one end.
6, and the other end is connected to a bracket 14 </ b> C of the bucket 14 by a connecting pin 28.

The prior art hydraulic excavator has the above-described configuration.
7. The boom 12, the arm 13, and the bucket 14 are rotated by operating the arm cylinder 18, the bucket cylinder 19, respectively. When excavating work such as earth and sand, first, the boom 12, the arm 13,
The bucket 14 is pivoted downward to excavate the ground or the like, and FIG.
As shown in FIG. 1, an excavated object G such as earth and sand is stored in a bucket 14. Then, by rotating the boom 12 and the arm 13 upward and rotating the upper swing body 2, the bucket 14 is moved to a desired discharge place, and then the bucket 14 is moved.
The excavated material G is discharged by turning the upward.

[0010]

In the prior art described above, when excavation is performed by a hydraulic excavator, the bucket 14 is rotated so as to be folded toward the lower plate 21 of the arm 13 as shown in FIG. By doing so, the excavated material G such as earth and sand is held in the bucket 14, and in this state, the working device 11 is often moved toward a discharging site or the like.

However, when the bucket 14 is turned toward the lower plate 21 of the arm 13, the excavated material G spilling out of the bucket 14 is not covered by the opening 24 on the distal end side of the arm 13.
And the excavated material G flows out of the opening 24 toward the upper plate 20 of the arm 13, thereby causing the bucket link 1 to move.
In some cases, the connecting parts may be in contact with connecting parts between the rods 5 and 16 and the rod 19B of the bucket cylinder 19 and the connecting pins 26 and 27.

In particular, when digging down the ground, the boom 12, the arm 13 and the like are extended downward and inserted into the depths of grooves, holes and the like serving as digging portions.
Since the earth and sand may be scraped off by rotating the upper part 4 upward, a large amount of excavated matter G spills out of the bucket 14 and enters the opening 24 of the arm 13 to come into contact with each part.

For this reason, in the prior art, the bucket links 15, 16, the bucket cylinder 19, the connecting pins 26, 2
While each component such as 7 repeatedly contacts the excavated object G through the opening 24, there is a possibility that earth and sand or the like may enter the sliding portions of these components, causing the components to wear or be damaged at an early stage. However, there is a problem that durability and reliability are reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent excavated matter spilling from a bucket from contacting each part through an opening of an arm. An object of the present invention is to provide a working device of a hydraulic shovel that protects the above components and can improve durability and reliability.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a boom provided on a body of a hydraulic excavator and raised and lowered by a boom cylinder, and a boom provided on a tip side of the boom and rotated by an arm cylinder. An arm to be moved, and a bucket provided on the tip side of the arm and rotated by a bucket cylinder, wherein the arm has an upper plate,
A bracket is formed by a lower plate and left and right side plates in a box shape, and a bracket of the bucket is connected to a distal end side of the arm through an opening penetrating the upper plate and the lower plate using a connecting pin. It is applied to a working device of a hydraulic shovel having left and right bucket mounting portions.

The first aspect of the present invention is characterized in that the lower plate of the arm is mounted at a position covering the opening between the left and right bucket mounting portions, and the opening is excavated by the bucket. In other words, a configuration is provided in which a shielding member that shields from excavated material is provided.

With this configuration, the shielding member can cover the opening at the lower plate side of the arm, so that the bucket excavates earth and sand and turns downward to approach the lower plate side of the arm. When the arm is opened, the opening of the arm can be shielded from the excavated material in the bucket by a shielding member. For example, components such as a bucket link, a bucket cylinder, and a connecting pin arranged on the upper plate side of the arm are connected through the opening of the arm. Contact with excavated objects can be prevented.

According to the second aspect of the present invention, the shielding member is formed of a flexible material fixed to the lower plate of the arm and covering the opening at a position away from the bucket. And a flexible plate extending from the fixed plate toward the bucket so as to cover the opening and contacting the bracket side of the bucket.

Thus, the fixing plate of the shielding member is
A portion of the opening of the arm that is distant from the bucket can be covered, and the flexible plate can cover the opening at a position closer to the bucket than the fixed plate. Then, when the bucket rotates toward the lower plate side of the arm and its bracket side comes into contact with the flexible plate, the flexible plate is pushed by the bracket and can be bent and deformed. Almost the entire opening can always be shielded from excavated materials such as earth and sand without hindering the rotation operation.

According to the third aspect of the present invention, the flexible plate of the shielding member is exchangeably connected to the fixed plate using a connecting member.

Thus, for example, when the flexible plate is worn, damaged, or deteriorated with time, the flexible plate can be removed together with the connecting member from the fixed plate, and the replacement can be easily performed. be able to.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a working device of a hydraulic shovel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, the same components as in the related art are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 31 denotes a working device applied to the present embodiment in place of the working device 11 of the prior art.
1 is a boom 12, an arm 1
3, a bucket 14, bucket links 15, 16, a boom cylinder 17, an arm cylinder 18, a bucket cylinder 19 and the like. And arm 13
Are upper plate 20, lower plate 21, left and right side plates 22, inner plate 23
Formed in a substantially box shape, and an opening 2
Left and right bucket mounting portions 13 extending bifurcated with respect to 4
A is provided.

However, as shown in FIG.
As shown in FIG. 4 to FIG. 4, for example, three screw seats 32, 32,... Are fixed to a portion surrounding the opening 24 by means of welding or the like in order to attach a shielding member 34 described later. Are provided with a plurality of screw holes 33, 33,.

Numeral 34 denotes a plate-shaped shielding member provided on the lower plate 21 at a position covering the opening 24 of the arm 13. The shielding member 34 includes a fixed plate 35 and a flexible plate 3 which will be described later.
8, and includes a holding plate 39 and the like.

Reference numeral 35 denotes a flat fixed plate formed of, for example, a metal plate, a resin plate, or the like.
The opening 2 of the arm 13 as shown in FIGS.
4 and a plurality of screw insertion holes 35A, which are arranged corresponding to the screw holes 33 on the arm 13 side and through which fixing screws 41 to be described later are inserted, on the outer edge side thereof, A plurality of screw insertion holes 35B through which the screws 40 are inserted are provided.

On the front side of the fixing plate 35 located on the opposite side to the arm 13, rectangular protection projections 36, 36,.
The protection projections 37 for protecting the head of the screw 40 are fixed by welding or the like. The protection projections 36 and 37 have a plurality of screw holes 3 for receiving the heads of the screws 40 and 41.
6A and 37A are provided respectively.

The fixing plate 35 is fastened and fixed to the screw seat 32 of the arm 13 (the lower plate 21) by each fixing screw 41, and covers a part of the opening 24. In this case, the fixing plate 35 is
4C and the like, and when the bucket 14 rotates toward the lower plate 21 side of the arm 13 as shown in FIG. 7 described later, the bucket 14 does not interfere with the bracket 14C and the like. .

Numeral 38 denotes a flexible plate formed of a flexible material such as rubber or resin material into a rectangular flat plate. The flexible plate 38 has a width dimension corresponding to the fixed plate 35. The fixing plate 35 is exchangeably connected to the outer edge side of the fixing plate 35 by using a holding plate 39 and a connecting screw 40.

In this case, as shown in FIGS. 4 and 6, the holding plate 39 is formed of an elongated rectangular metal plate or the like having a width substantially equal to that of the flexible plate 38. While holding the flexible plate 38,
In this state, it is fastened to the fixing plate 35 by the connection screws 40.

The flexible plate 38 projects from the fixed plate 35 toward the bucket 14, and the arm 13
Extends substantially parallel to the lower plate 21 and the fixed plate 3
5 and the bucket 14 cover the opening 24.

Thus, during civil engineering work such as excavation, the opening 24 of the arm 13 is always covered from the lower plate 21 side by using the fixed plate 35 and the flexible plate 38. The shielding member 34 shields the opening 24 from the excavated material G such as earth and sand stored in the bucket 14, and the excavated material G is transferred to the bucket link 15, 1 through the opening 24.
6. Bucket cylinder 19 rod 19B, connecting pin 2
This prevents the parts 6 and 27 from coming into contact with each other and protects the sliding parts and the like of these parts from the excavated object G.

Here, during excavation work such as earth and sand, the bucket 14 rotates toward the lower plate 21 side of the arm 13 as shown in FIG. When they come into contact with each other, the distal end side of the flexible plate 38 is pushed by the bracket 14 </ b> C to be bent and deformed. At this time, the flexible plate 38 is configured not to hinder the pivoting operation of the bucket 14 or to be damaged by contact with the bracket 14C.

As shown in FIG. 8, when the bucket 14 is largely turned upward while the arm 13 is tilted downward, the distal end side of the flexible plate 38 is separated from each bracket 14C of the bucket 14, and the like. The opening 24 of the arm 13 is opened downward through the space between the brackets 14C. For this reason, even if earth and sand or the like intrudes into the opening 24 from above, the earth and sand or the like is dropped downward from between the brackets 14C, and
Can be discharged from

Reference numerals 40, 40,... Denote a plurality of connecting screws serving as connecting members for connecting the fixed plate 35 and the flexible plate 38. As shown in FIG. The screw is screwed to the holding plate 39 via a screw insertion hole 35B provided in the fixed plate 35 and the flexible plate 38, and these members are integrally connected.

, 41, 41,...
3 are fixed to the lower plate 21. Each of the fixing screws 41 is composed of a hexagon socket head bolt or the like.
5, the screw hole 33 of the screw seat 32 through the screw insertion hole 35A.
Is screwed on.

The working device 31 of the hydraulic shovel according to the present embodiment has the above-described configuration, and
There is no particular difference in the basic operation when excavating work such as earth and sand from the prior art.

However, according to the present embodiment, the arm 1
The lower plate 21 is provided with a shielding member 34 for shielding the opening 24 from the excavated material G such as earth and sand excavated by the bucket 14. The portion 24 can always be covered by the fixed plate 35 and the flexible plate 38 from the lower plate 21 side.

Thus, the shielding member 34 is attached to the bucket 1
4 can reliably prevent the excavated material G from spilling out toward the upper plate 20 through the opening 24 of the arm 13, so that the bucket links 15, 16, the rod 19 B of the bucket cylinder 19, the connecting pins 26, 27, etc. It is possible to prevent each of the components, including the components, from coming into contact with the excavated object G through the opening 24, and to stably protect sliding parts and the like of these components over a long period of time, and to improve durability and reliability. Can be done.

Further, since the shielding member 34 is constituted by the fixed plate 35 and the flexible plate 38, the opening 2
4 is fixed plate 3
5 enables stable covering. When the bucket 14 rotates toward the lower plate 21 of the arm 13, the flexible plate 38 is moved to the opening 24 as shown in FIG.
Can be flexed and deformed by contacting the bucket 14 with the bracket 14 </ b> C while covering the opening 14.
Can be always shielded from the excavated object G.

Further, the flexible plate 38 includes a holding plate 39.
Since the flexible plate 38 is replaceably connected to the fixing plate 35 by using the connecting plate 40 and the connecting screw 40, when the flexible plate 38 is worn, damaged, or deteriorated with time, for example, the holding plate 39 and the connecting screw 40 are connected. The flexible plate 38 can be replaced with a new one only by attaching and detaching the fixing plate 35, and the replacement work can be easily performed without removing the fixing plate 35 from the arm 13 side.

In this embodiment, the fixing plate 35 of the shielding member 34 is fixed to the lower plate 21 of the arm 13 by fixing screws 41, and the flexible plate 38 is connected to the fixing plate 35 by connecting screws 40. However, the present invention is not limited to this, and the fixing plate 35 may be fixed to the lower plate 21 of the arm 13 by means such as welding.

[0043]

As described above in detail, according to the first aspect of the present invention, the lower plate of the arm is provided with the shielding member for shielding the opening of the arm from the excavated material by the bucket. During the excavation work, the opening of the arm can be always covered from the lower plate side by the shielding member. This allows the shielding member to reliably prevent excavated matter such as earth and sand from the bucket from spilling out to the upper plate side through the opening of the arm. Can prevent contact with excavated materials through the parts, and can stably protect sliding parts of these parts for a long period of time,
Reliability can be improved.

According to the second aspect of the present invention, since the shielding member is constituted by the fixed plate and the flexible plate, the fixed plate can stably cover a portion of the opening of the arm which is apart from the bucket. Can be. When the bucket rotates toward the lower plate of the arm, the flexible plate covers the opening of the arm and can bend and deform by contacting the bracket side of the bucket. Without disturbing the movement
Almost the entire opening can always be shielded from excavated materials such as earth and sand.

According to the third aspect of the present invention, since the flexible plate of the shielding member is exchangeably connected to the fixed plate using the connecting member, it is possible to simply attach and detach the connecting member. The flexible plate can be replaced with a new one, and the replacement operation can be easily performed without removing the fixed plate from the arm side.

[Brief description of the drawings]

FIG. 1 is an enlarged front view showing a distal end side of a working device of a hydraulic shovel according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of an arm, a bucket, a shielding member, and the like as viewed from a direction indicated by arrows II-II in FIG.

FIG. 3 is an enlarged view of a main part in FIG. 2 showing a base end side of a fixing plate.

FIG. 4 is an enlarged view of a main part in FIG. 2 showing a distal end side of a fixing plate.

FIG. 5 is a front view showing the shielding member alone.

FIG. 6 is a cross-sectional view of the shielding member as viewed from a direction indicated by arrows VI-VI in FIG.

FIG. 7 is a partial side view of the working device showing a state in which a flexible plate is bent and deformed by rotating a bucket toward a lower plate of an arm.

FIG. 8 is a partial side view of the working device showing a state of discharging earth and sand and the like that have entered the opening of the arm.

FIG. 9 is an external view showing a conventional hydraulic excavator.

FIG. 10 is an enlarged front view of an arm, a bucket, and the like as viewed in a direction indicated by arrows XX in FIG. 9;

FIG. 11 is a partial side view of the working device showing a state in which an excavated object in the bucket has entered the opening of the arm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure (vehicle body) 12 Boom 13 Arm 13A Bucket mounting part 14 Bucket 14C Bracket 15, 16 Bucket link 17 Boom cylinder 18 Arm cylinder 19 Bucket cylinder 20 Upper plate 21 Lower plate 22 Side plate 24 Opening 25, 26, 27, 28 Connecting pin 31 Working device 32 Screw seat 33 Screw hole 34 Shielding member 35 Fixing plate 36, 37 Protective projection 38 Flexible plate 39 Clamping plate 40 Connecting screw (connecting member) 41 Fixing screw

Claims (3)

[Claims] 1. A boom provided on a body of a hydraulic excavator and raised and lowered by a boom cylinder, an arm provided on a tip side of the boom and rotated by an arm cylinder,
The arm is formed in a box shape by an upper plate, a lower plate, and left and right side plates. The arm is formed at a tip end side of the arm and is rotated by a bucket cylinder. A working device for a hydraulic shovel, comprising left and right bucket mounting portions to which brackets of the bucket are connected using connection pins with an opening penetrating the upper plate and the lower plate interposed therebetween, A hydraulic excavator provided with a shielding member mounted at a position covering the opening between the left and right bucket mounting portions and shielding the opening from excavated material excavated by the bucket. Working equipment. 2. A fixing plate fixed to a lower plate of the arm and covering the opening at a position distant from the bucket, a shielding plate formed of a flexible material, and The hydraulic shovel working device according to claim 1, further comprising a flexible plate extending to cover the opening and facing the bracket side of the bucket. 3. The working device of a hydraulic shovel according to claim 2, wherein the flexible plate of the shielding member is replaceably connected to the fixed plate using a connecting member.