JP2002256595A - Work device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widely cover an angle sensor for detecting the turning angle of an arm to a boom and a link member or the like connected to the angle sensor. SOLUTION: An auxiliary cover 32 connected to a peripheral wall plate 27B of a sensor cover 27 to be extended is provided in an entering space 29 formed between the side 19A of an arm 19 and the sensor cover 27 by providing a cutout part 27C in the sensor cover 27, and the other end of the link member 26 is covered with the auxiliary cover 32. By this arrangement, when the arm 19 is turned to the dump end position in digging work, sediment can be inhibited from entering between the arm 19 and the sensor cover 27 by the auxiliary cover 32 through the cutout part 27C of the sensor cover 27 so that the angle sensor 25 and the link member 26 can be protected over a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working device for a construction machine which is mounted on a construction machine such as a hydraulic shovel and is preferably used for excavation work such as earth and sand.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A boom mounted on a self-propelled body so that it can be raised and lowered,
An arm rotatably mounted on the tip side of the boom,
A working device including a working tool rotatably attached to the distal end side of the arm is provided, and the working device is used for excavating earth and sand.

A conventional hydraulic excavator of this type will be described with reference to FIGS. 7 to 13 by taking a hydraulic excavator having an offset type working device as an example.

In the drawing, reference numeral 1 denotes a crawler-type lower traveling body, 2 denotes an upper revolving body which is rotatably mounted on the lower traveling body 1, and the lower traveling body 1 and the upper revolving body 2 are a body of a hydraulic shovel. Is composed. The upper revolving unit 2 includes a revolving frame 3, a cab 4, a building cover 5, and a counterweight 6.
And the like.

[0005] An offset type working device 11 is provided on the front side of the upper revolving unit 2 so as to be able to move up and down.
Reference numeral 1 denotes a lower boom 12, an upper boom 14, an arm stay 16, an arm 19, a bucket 22, an angle sensor 25, a link member 26, and the like, which will be described later.

A lower boom 12 is attached to the front side of a revolving frame 3 constituting the upper revolving unit 2 so as to be able to move up and down. The robot moves up and down with respect to the turning frame 3.

An upper boom 14 is attached to the distal end side of the lower boom 12 so as to be rotatable left and right. The upper boom 14 is moved relative to the lower boom 12 by an offset cylinder 15 provided between the lower boom 12 and the lower boom 12. It turns (offsets) in the left and right directions.

Reference numeral 16 denotes an arm stay as an arm supporting portion rotatably provided on the distal end side of the upper boom 14 in the left and right directions. The arm stay 16 is provided in the left and right directions as shown in FIG. Left side plate 16A and right side plate 16 facing each other
B. The arm stay 16 holds the arm 19 to be described later between the left and right sides by the side plates 16A and 16B.
By inserting the connecting pin 17 into the arm 19 and the arm 19,
The arm 19 is rotatably supported via the connecting pin 17. Also, the left side plate 16A of the arm stay 16
Of these, a bracket 16C to which a link member 26 to be described later is connected is fixed by welding or the like to a peripheral portion near the connecting pin 17 (see FIG. 10).

Reference numeral 18 denotes a rod for connecting the distal end of the lower boom 12 to the left side plate 16A of the arm stay 16, and the rod 18 constitutes a parallel link together with the lower boom 12, the upper boom 14, and the arm stay 16; When the arm is rotated left and right, the arm stay 1
6 is held parallel to the lower boom 12.

An arm 19 is attached to the arm stay 16 so as to be rotatable upward and downward. The arm 19 is connected between the side plates 16A and 16B of the arm stay 16 by connecting pins 17A and 16B.
And is rotatably supported via the. Arm 19
12 and the like, as shown in FIG.
A cylinder bracket 20 composed of 0A and 20B protrudes, and an arm cylinder 21 is provided between the cylinder bracket 20 and the arm stay 16.

The arm 19 is connected to the arm cylinder 2
1 rotates around the connecting pin 17, and the position where the distal end is closest to the arm stay 16 (cloud end position) as shown in FIG. 8 and the distal end is farthest from the arm stay 16 as shown in FIG. The position (dump end position) is displaced.

Here, as shown in FIGS. 10 and 12,
On the left side surface 19A of the arm 19, a cylindrical boss 19B, which is located near the arm stay 16 and for attaching a sensor cover 27 described later, is fixed by welding, and is also attached to the left side plate 20A of the cylinder bracket 20. Similar bosses 20C, 20C are fixed.

Reference numeral 22 denotes a bucket as a working tool rotatably attached to the distal end of the arm 19.
A bucket link 23 for rotating the bucket 22 is provided between the bucket link 23 and the cylinder bracket 20 of the arm 19.

25 is a cylinder bracket 2 of the arm 19
The angle sensor 25 is provided on the left side plate 2 of the cylinder bracket 20 as shown in FIG.
It is fixed to 0A using bolts or the like (not shown).
The angle sensor 25 includes a shaft portion 25A for angle detection.
And a detection unit (not shown) such as a potentiometer for detecting the rotation position of the shaft 25A, and detects the rotation angle of the arm 19 with respect to the upper boom 14 (arm stay 16).

Reference numeral 26 denotes an angle sensor 25 for detecting the rotation of the arm 19.
A link plate 26A made of a substantially L-shaped plate body having one end fixed to the shaft 25A of the angle sensor 25 and the other end extending in the radial direction of the shaft 25A; One end side is roughly constituted by a rod-shaped link rod 26B rotatably pin-connected to the other end side of the link plate 26A, and the other end side is rotatably pin-connected to the bracket 16C of the arm stay 16.

When the arm 19 rotates between the cloud end position and the dump end position around the connecting pin 17, the link member 26 is displaced along with the arm 19 while rotating the arm 19. Is transmitted to the shaft portion 25A of the angle sensor 25.

Reference numeral 27 denotes a sensor cover provided on the base end side of the arm 19. The sensor cover 27 is disposed from the cylinder bracket 20 (left side plate 20A) to the arm stay 16 (left side plate 16A). By covering the link members 26, they are protected from earth and sand during excavation work.

Here, as shown in FIGS. 12 and 13, the sensor cover 27 is formed by bending a thin metal plate or the like, thereby forming a substantially rectangular side plate facing the side surface 19A of the arm 19. 27A, and extends to the side surface 19A side of the arm 19 along the periphery of the side plate 27A, and the angle sensor 2
5 and a peripheral wall plate 27B substantially L-shaped provided at a position corresponding to one end of the link member 26 (link rod 26B).
And a notch 27C provided at a position corresponding to the other end of the link member 26 (link rod 26B). A boss 19B provided on a side surface 19A of the arm 19 is provided on a side plate 27A of the sensor cover 27.
Three bolt insertion holes 27D are provided at positions corresponding to the bosses 20C provided on the left side plate 20A of the cylinder bracket 20.
Are drilled.

Then, the sensor cover 27 connects the bolt 28 inserted into each bolt insertion hole 27 D to the boss 1 of the arm 19.
9B, is attached to the arm 19 by screwing into each boss 20C of the cylinder bracket 20, and the angle sensor 2
5. It is configured to cover the link member 26.

Here, when the arm 19 rotates to the cloud end position as shown in FIG. 8, the left side constituting the arm stay 16 is provided between the side surface 19A of the arm 19 and the sensor cover 27 (side plate 27A). Part of the plate 16A enters. Therefore, the notch 27C is formed in the sensor cover 27.
Is provided, the side plate 27A of the sensor cover 27 is provided.
Between the arm 19 and the side surface 19A of the arm 19,
The configuration is such that an entry space 29 having a width A for allowing the entry of the (left side plate 16A) is secured (see FIG. 11).

Working device 1 for hydraulic excavator according to prior art
Reference numeral 1 has the above-described structure. When excavating work such as earth and sand using the working device 11, for example, the lower boom 12 is lowered to the ground side, and the arm 19 is rotated from the dump end position to the cloud end position. By doing
The bucket 22 scoops up earth and sand. After the lower boom 12 is lifted and the upper swing body 2 is swung, the arm 19 is turned to the dump end position, so that the earth and sand in the bucket 22 is discharged to a desired dumping place.

At this time, the rotational displacement of the arm 19 is transmitted to the shaft 25A of the angle sensor 25 via the link member 26, and the angle sensor 25 transmits the upper boom 14 (the arm stay 16) based on the rotational displacement of the shaft 25A. ) Is detected. Then, the sensor cover 27
Covers the angle sensor 25 and the link member 26 to protect them from earth and sand during excavation work.

[0023]

In the working device 11 according to the prior art described above, the angle sensor 25 and the link member 26 are covered by the sensor cover 27. When pivoting to the end position, the side surface 19 of the arm 19
A notch 27C for securing an entry space 29 into which the arm stay 16 (the left side plate 16A) enters is formed between the notch 27C and the arm stay A.

Therefore, as shown in FIGS. 9 and 11,
When the arm 19 rotates to the dump end position,
Although the range up to one end of the angle sensor 25 and the link member 26 can be covered by the peripheral wall plate 27B of the sensor cover 27, the other end of the bracket 16C of the arm stay 16 and the link member 26 connected to the bracket 16C Then, the sensor cover 27 is exposed through the notch 27C. As a result, earth and sand during excavation work,
There is a problem that the sensor member 27 enters between the arm 19 and the sensor cover 27 through the cutout portion 27C of the sensor cover 27 to damage the link member 26 and the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and is intended to cover an angle sensor for detecting a rotation angle of an arm with respect to a boom and a link member connected to the angle sensor over a wide range. It is an object of the present invention to provide a working device of a construction machine that can be used.

[0026]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a boom which is mounted on a vehicle body of a construction machine so as to be able to move up and down, and a tip end side of which is an arm support portion. An arm rotatably mounted and provided with a work implement at the distal end, an angle sensor provided on the arm for detecting a rotation angle of the arm with respect to the boom, and for transmitting the rotation of the arm to the angle sensor A link member having one end connected to the angle sensor and the other end connected to the arm support portion, and a sensor cover provided on the arm and covering the angle sensor and the link member. The present invention is applied to a working device of a construction machine provided with a notch for securing an entry space into which the arm supporting portion enters between the arm supporting portion and the side surface of the arm at the time of clouding.

A feature of the structure adopted in the first aspect of the present invention is that the angle sensor is located on the side surface of the arm in the entrance space between the side surface of the arm and the sensor cover together with the sensor cover. And an auxiliary cover that covers the link member.

With this configuration, even when the sensor cover is provided with a notch for securing an entry space into which the arm support enters when the arm is crowded, the notch is covered with the auxiliary cover. be able to. For this reason, the angle sensor and the link member can be covered over a wide range by the sensor cover and the auxiliary cover, and the angle sensor and the link member can be protected from earth and sand during excavation work.

According to a second aspect of the present invention, the sensor cover has a side plate facing the side surface of the arm, and extends along the peripheral edge of the side plate to the side surface of the arm, and corresponds to one end of the angle sensor and the link member. And a notch provided at a position corresponding to the other end of the link member, and the auxiliary cover is provided with an arm so as to cover the notch continuously with the peripheral wall of the sensor cover. And a plate protruding from the side surface of the sensor cover toward the side plate of the sensor cover.

According to this structure, the auxiliary cover covers the cutout of the sensor cover in a state of being continuous with the peripheral wall plate of the sensor cover, so that the angle sensor and the link member can be extended over a wide range by the sensor cover and the auxiliary cover. Can be covered.

According to a third aspect of the present invention, a gap is provided between the projecting end of the auxiliary cover and the side plate of the sensor cover so that the arm supporting portion can enter when the arm is crowded.

With this configuration, the arm support portion of the boom can pass through the gap secured between the auxiliary cover and the side plate of the sensor cover without interfering with the auxiliary cover when the arm is clouded. can do.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a working device of a hydraulic shovel will be described below in detail with reference to FIGS. In the present embodiment, the same components as those in the above-described 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 11 according to the prior art.
Instead of the working device of the offset type used in the present embodiment, the working device 31 includes a lower boom 12, an upper boom 14, an arm stay 16, an arm 19, a bucket 22, an angle sensor 25, a link member 26 and the like. However, the working device 31 according to the present embodiment includes the side surface 19 </ b> A of the arm 19.
Is different from the prior art in that an auxiliary cover 32 described later is provided.

Reference numeral 32 denotes an auxiliary cover provided on the side surface 19A of the arm 19. The auxiliary cover 32 is located in an entrance space 29 formed between the side surface 19A of the arm 19 and the side plate 27A of the sensor cover 27. Then, the angle sensor 25 and the link member 26 are covered together with the sensor cover 27.

In this case, the auxiliary cover 32 is provided as shown in FIGS.
As shown in FIG. 3, a thin rectangular metal plate or the like is bent to form a bow-shaped partition 32A corresponding to the peripheral edge of the side plate 27A of the sensor cover 27, and welding or the like is performed on the partition 32A. The bracket 32B has three bolts 32B, and each of the brackets 32B has a bolt insertion hole 32C for inserting a bolt 33 described later.

On the other hand, three screw seats 19C are fixed to the side surface 19A of the arm 19 in the vicinity of the boss 19B by welding.
It is arranged at a position corresponding to the second bracket 32B.

The auxiliary cover 32 is attached to the side surface 19A of the arm 19 by screwing a bolt 33 inserted into the bolt insertion hole 32C of each bracket 32B into each screw seat 19C of the arm 19, and the sensor cover 27 is attached. And extends to a portion near the connecting pin 17 continuously to the peripheral wall portion 27B. Thereby, the partition portion 32A of the auxiliary cover 32
Project from the side surface 19A of the arm 19 toward the side plate 27A of the sensor cover 27, and partially cover the notch 27C of the sensor cover 27, as shown in FIGS. It is configured to cover the other end of the link member 26 that cannot be covered.

When the arm 19 rotates to the cloud end position, the arm stay 16 is positioned between the protruding end portion 32D of the auxiliary cover 32 (partition portion 32A) and the side plate 27A of the sensor cover 27. A gap 34 having a width a enough to allow the left side plate 16A to enter is formed (see FIG. 4).

As described above, the auxiliary cover 32 secures the gap 34 between the side plate 27A of the sensor cover 27 and the arm stay 16 (the left side plate 16A) so that the notch 27C of the sensor cover 27 can be formed. It covers and protects the angle sensor 25 and the link member 26 together with the sensor cover 27 over a wide range.

The working device 31 according to the present embodiment has the above-described configuration. When the working device 31 is used for excavation work such as earth and sand, for example, the lower boom 12 is used.
Is lowered to the ground side, and the arm 19 is rotated from the dump end position to the cloud end position, so that the bucket 22 scoops up earth and sand. And lower boom 12
Is lifted, and the upper revolving unit 2 is turned, and then the arm 19 is turned to the dump end position, so that the bucket 2
The earth and sand in 2 is discharged to a desired discharge place.

When the arm 19 is in the dump end position during the excavation operation, the other end of the link member 26 connected to the bracket 16C of the arm stay 16 is connected to the sensor as shown in FIGS. It approaches the notch 27C of the cover 27.

However, since the auxiliary cover 32 is provided at a position corresponding to the notch 27C (in the entry space 29 between the sensor cover 27 and the side surface 19A of the arm 19), the peripheral wall plate of the sensor cover 27 is provided. The other end of the link member 26, which cannot be covered only by 27B, can be covered by the auxiliary cover 32. For this reason, soil and the like at the time of the excavation work are transferred to the arm 1 through the notch 27C of the sensor cover 27.
It is possible to prevent the link member 26 from being inserted between the sensor cover 27 and the sensor cover 27 and to prevent the link member 26 from being damaged by the earth and sand, and to protect the link member 26, the angle sensor 25, and the like.

On the other hand, even when the arm 19 is at the cloud end position, the notch 27C of the sensor cover 27 can be covered by the auxiliary cover 32 as shown in FIG. The link member 26 extends over substantially the entire rotation range of the link member 26.
Can be protected from earth and sand during excavation work.

Thus, according to the present embodiment, the provision of the notch 27C in the sensor cover 27 allows the sensor cover 27 to be inserted into the entry space 29 formed between the side surface 19A of the arm 19 and the sensor cover 27. Perimeter wall plate 27B
When the arm 19 rotates between the cloud end position and the dump end position during excavation work, earth and sand and the like pass through the notch 27C of the sensor cover 27 so that the arm 19 rotates. The auxiliary cover 32 can prevent the sensor 19 from entering between the sensor 19 and the sensor cover 27.
6 can be reliably protected.

When the arm 19 rotates to the cloud end position between the protruding end portion 32D of the auxiliary cover 32 (partition portion 32A) and the side plate 27A of the sensor cover 27, the left side of the arm stay 16 is moved. Since the gap 34 having a width dimension a enough to allow the plate 16A to enter is formed, when the arm 19 is rotated to the cloud end position, the arm stay 16 is surely prevented from interfering with the auxiliary cover 32. Can pass through.

In the above embodiment, the offset type working device 31 provided with the lower boom 12, the upper boom 14, the arm stay 16, and the like has been described as an example. However, the present invention is not limited to this. For example, the present invention can be applied to a working device having a single boom.

[0048]

As described above in detail, according to the first aspect of the present invention, by providing the auxiliary cover on the side surface of the arm,
Even if the sensor cover that covers the angle sensor and the link member is provided with a notch for securing an entry space into which the arm support enters when the arm is crowded, the notch can be covered by the auxiliary cover. The angle sensor and the link member can be covered over a wide range by the sensor cover and the auxiliary cover. For this reason, these angle sensors and link members can be reliably protected from earth and sand during excavation work.

According to the second aspect of the present invention, the sensor cover has a side plate facing the side surface of the arm, and extends to the side surface of the arm along the peripheral edge of the side plate, and the angle sensor and one end of the link member. And a notch provided at a position corresponding to the other end of the link member, and the auxiliary cover has a notch formed continuously with the peripheral wall plate of the sensor cover. The auxiliary cover and the peripheral wall plate of the sensor cover are continuous without any gap because the plate body is formed by a plate protruding from the side surface of the arm toward the side plate of the sensor cover so as to cover the arm cover. , The angle sensor and the link member can be reliably covered over a wide range.

Furthermore, according to the third aspect of the present invention, a gap is provided between the protruding end of the auxiliary cover and the side plate of the sensor cover so that the arm support of the boom can enter. At the time of the cloud, the arm support provided on the boom does not interfere with the auxiliary cover,
It can pass through a gap secured between the auxiliary cover and the sensor cover.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of a main part showing an angle sensor, a link member, a sensor cover, an auxiliary cover, and the like of a working device according to an embodiment of the present invention in a state where an arm is at a cloud end position.

FIG. 2 is an enlarged front view of an essential part showing an angle sensor, a link member, a sensor cover, an auxiliary cover, and the like in an enlarged state with an arm at a dump end position.

FIG. 3 is an enlarged front view of an essential part showing the angle sensor, link member, auxiliary cover, and the like in FIG. 2 with a sensor cover removed.

FIG. 4 is a cross-sectional view of an angle sensor, a link member, a sensor cover, an auxiliary cover, and the like, which are enlarged from a direction indicated by arrows IV-IV in FIG.

FIG. 5 shows an arm of a working device according to an embodiment of the present invention;
FIG. 4 is an exploded perspective view showing an angle sensor, a link member, an auxiliary cover, and the like in a state where the sensor cover is disassembled.

6 is an exploded perspective view in which the auxiliary cover in FIG. 5 is disassembled from the arm and is enlarged.

FIG. 7 is a front view showing a hydraulic excavator provided with a working device according to the related art.

FIG. 8 is an enlarged front view of a main part showing an angle sensor, a link member, a sensor cover, and the like in a state where the arm is at a cloud end position.

FIG. 9 is an enlarged front view of an essential part showing an angle sensor, a link member, a sensor cover, and the like in an enlarged state with an arm at a dump end position.

FIG. 10 is an enlarged front view of an essential part showing the angle sensor, the link member and the like in FIG. 9 with a sensor cover removed.

FIG. 11 is a cross-sectional view of the angle sensor, the link member, the sensor cover, and the like, which are enlarged in a direction indicated by arrows XI-XI in FIG.

FIG. 12 is an exploded perspective view showing an arm, an angle sensor, a link member, and the like of a working device according to the related art in a state where a sensor cover is disassembled.

FIG. 13 is a perspective view showing the sensor cover alone.

[Explanation of symbols]

 Reference Signs List 1 lower traveling body (vehicle body) 2 upper revolving superstructure (vehicle body) 12 lower boom 14 upper boom 16 arm stay (arm support) 19 arm 19A side surface 22 bucket (work implement) 25 angle sensor 26 link member 27 sensor cover 27A side plate 27B peripheral wall Plate 27C Notch 29 Entry space 31 Working device 32 Auxiliary cover 32D Projecting end 34 Gap

Claims (3)

[Claims] 1. A boom which is mounted on a vehicle body of a construction machine so as to be able to move up and down and has an arm supporting portion at a tip end thereof, and an arm which is rotatably mounted on an arm supporting portion of the boom and has a working tool provided on the tip end side. An angle sensor provided on the arm for detecting a rotation angle of the arm with respect to the boom, and one end connected to the angle sensor and the other end connected to the arm support for transmitting the rotation of the arm to the angle sensor. Link member, and a sensor cover provided on the arm and covering the angle sensor and the link member. The arm support portion enters the sensor cover between the side surface of the arm and the cloud of the arm. A working device of a construction machine provided with a notch for securing an approaching space, wherein a side surface of the arm is provided between a side surface of the arm and the sensor cover. Working apparatus for a construction machine is characterized in that a configuration in which the auxiliary cover for covering said angle sensor and the link member with the sensor cover located inlet space. 2. The sensor cover includes a side plate facing the side surface of the arm, and extends to a side surface of the arm along a peripheral edge of the side plate, and corresponds to one end of the angle sensor and the link member. A peripheral wall plate provided at a position and the notch provided at a position corresponding to the other end side of the link member, wherein the auxiliary cover is continuous with the peripheral wall plate of the sensor cover. The working device of a construction machine according to claim 1, wherein the work device is configured by a plate protruding from a side surface of the arm toward a side plate of the sensor cover so as to cover the arm. 3. The device according to claim 2, wherein a gap is provided between the projecting end of the auxiliary cover and the side plate of the sensor cover so that the arm support can enter when the arm is crowded. Construction machine working equipment.