JP2001140275A - Construction machine for excavating side ditch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce burden on an operator and to improve work efficiency by providing a protrusion for verifying the location of the end-part side of an arm cylinder at all times. SOLUTION: The upper boom 10 of a work device 7 is rotated to the right and left directions with respect to a lower boom 8 by an offset cylinder 11 to offset an arm stay 2, an arm 14, a bucket 18, etc., to the right side or the left side of a vehicle. In addition, a rod-shaped member 21 is provided in the left-side surface part 10C of the upper boom 10, and the tip-end side of the rod-shaped member 21 is protruded to a location corresponding to the height of the bottom side 15C of an arm cylinder 15 at the time when it is moved uppermost. By this constitution, it is possible for the operator of a hydraulic shovel to prevent the arm cylinder 15 from coming into contact with obstructions etc. in its vicinity by visually recognizing the rod-shaped member 21 even in the case that the bottom side 15C of the arm cylinder 15 can not be directly viewed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to moving a tool such as a bucket to the left and right sides of a vehicle.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ditch digging construction machine suitably used for digging and the like.

[0002]

2. Description of the Related Art Generally, a construction machine for guttering such as a hydraulic excavator is provided with an offset boom type working device for moving a work implement such as a bucket to both left and right sides of a vehicle using an offset cylinder. It is configured to perform digging work and the like (for example, see Japanese Patent Application Laid-Open No. 8-27754).
No. 1).

A conventional hydraulic excavator of this kind is:
An offset boom type working device is mounted on the revolving frame of the upper revolving unit so as to be able to move up and down. An upper boom rotated left and right by an offset cylinder; an arm stay rotatably connected to the distal end side of the upper boom in a left and right direction; And an arm that is turned downward.

[0004] An operator of the hydraulic excavator rotates the upper boom left and right on the distal end side of the lower boom by extending and retracting the offset cylinder, and moves an arm stay, an arm, a bucket, and the like in parallel to the left or right side of the vehicle. (Offset), and by operating the boom cylinder, the arm cylinder, the bucket cylinder, and the like at this position, it is possible to perform gutter work using the boom, the arm, and the bucket.

In such a hydraulic excavator, an arm cylinder provided on an arm stay is composed of a tube and a rod projecting from the tube so as to be extendable and contractable, and the distal end side of the rod can be rotated by the arm. Attached to

The tube of the arm cylinder has one end rotatably attached to the arm stay, and the other end (bottom side) is a free end and is disposed above the upper boom.

[0007]

By the way, in the above-mentioned prior art, in order to perform the trenching operation, for example, the upper boom is rotated rightward with respect to the lower boom to offset the arm, the bucket and the like to the right side of the vehicle. In some cases, the bottom side of the arm cylinder offset to the right side of the vehicle may be obstructed by the lower boom, the upper boom, or the like, and may not be clearly seen from the driver's seat of the vehicle.

Therefore, in the prior art, even when the bottom side of the arm cylinder protrudes upward from the upper boom, the position cannot be confirmed from the driver's seat. There is a possibility that the bottom side of the cylinder may erroneously come into contact with an obstacle or the like.

An operator such as a hydraulic excavator
In order to prevent contact with surrounding obstacles, extra attention must be paid to the operation of the boom, the arm, and the like, which not only increases the burden on the operator but also lowers the work efficiency.

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 make it easy for an operator to easily position the end of the arm cylinder even when the arm cylinder is not visible from the driver's seat. It is therefore an object of the present invention to provide a construction machine for gutter digging, which can reduce the burden on the operator and improve the working efficiency of gutter digging and the like.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a vehicle body provided with a driver's seat, and a working device provided on the front side of the vehicle body so as to be able to move up and down. The apparatus includes a lower boom provided on a frame, which is moved up and down by a boom cylinder, an upper boom provided at a tip side of the lower boom and rotated left and right by an offset cylinder, and a tip side of the upper boom. An arm stay provided rotatably in the left and right directions, a link provided between the arm stay and the lower boom for holding the arm stay substantially parallel to the lower boom, and an arm provided on the arm stay The present invention is applied to a gutter construction machine having an arm that is turned up and down by a cylinder and a working tool provided on the distal end side of the arm.

A feature of the structure adopted in the first aspect of the present invention is that the working device is provided with a projection for confirming an arm cylinder position capable of confirming an end side of the arm cylinder. It is in.

[0013] With this configuration, the operator of the construction machine can determine the position of the cylinder end by visually observing the tip end of the protrusion even when the end of the arm cylinder is not directly visible from the driver's seat. It can be confirmed that the end side of the arm cylinder can be prevented from coming into contact with surrounding obstacles or the like during civil engineering work.

According to the second aspect of the present invention, the projection is formed by a rod-shaped member having a base end attached to the upper boom and a free end protruding upward at the tip end.

Thus, by visually observing the distal end side of the rod-shaped member, the operator can grasp the height position when the end side of the arm cylinder is moved to the uppermost position with respect to the upper boom, for example. Civil engineering work can be performed while ensuring a sufficient distance between the side and surrounding obstacles and the like.

According to the third aspect of the present invention, the protrusion is constituted by a rod-like member having a base end attached to the end of the arm cylinder and a distal end serving as a free end.

Thus, even when the end side of the arm cylinder is not directly visible from the operator in the driver's seat, the operator can confirm the position on the cylinder end side by visually observing the tip side of the rod-shaped member, and determine the height position. You can grasp and perform civil engineering work.

According to the fourth aspect of the present invention, the projection is formed by a rod-shaped member having a base end attached to the link and a free end protruding upward at the tip end.

Thus, the operator can check the height position on the end side of the arm cylinder by the rod-shaped member, and can secure a sufficient distance between the cylinder end side and an obstacle or the like.

Further, according to the fifth aspect of the present invention, since the projection is constituted by an elastically deformable rod-shaped member, it can be prevented from being damaged by being elastically deformed when the rod-shaped member comes into contact with an obstacle or the like. it can.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an offset boom type hydraulic excavator will be described in detail as an example of a ditching construction machine according to an embodiment of the present invention with reference to the accompanying drawings.

FIGS. 1 to 4 show a first embodiment of the present invention. In the drawings, reference numeral 1 denotes a lower traveling body of a hydraulic shovel, and 2 denotes a swingably mounted on the lower traveling body 1. The upper revolving structure has a driver's seat (not shown) on the revolving frame 3 of the upper revolving structure 2 located at the front left side thereof.
Are provided, a building cover 5 accommodating a motor and the like, a counterweight 6, and the like.

Reference numeral 7 denotes a working device which is located on the right side of the cab 4 and is mounted on the front side of the revolving frame so as to be able to move up and down. The working device 7 includes a lower boom 8, an upper boom 10, which will be described later.
Arm stay 12, link 13, arm 14, bucket 18, and cylinders 9, 11, 15, 1 for driving these
9 are included.

Reference numeral 8 denotes a lower boom whose base end is connected to the swing frame 3 so as to be able to move up and down. The lower boom 8 is moved up and down by a boom cylinder 9 disposed between the tip end of the lower boom and the swing frame 3. Things.

An upper boom 10 is connected to the distal end of the lower boom 8 so as to be rotatable leftward and rightward. As shown in FIGS. 1 to 4, the upper boom 10 is a hollow body having a rectangular cross section made of a steel plate or the like. It has an upper surface portion 10A, a lower surface portion 10B, and left and right side surface portions 10C and 10D. An offset cylinder 11 is provided between the left boom 10C of the upper boom 10 and the lower boom 8 so as to be extendable and retractable. The offset cylinder 11 moves the upper boom 10 with respect to the lower boom 8 as shown by an arrow A in FIG. It is configured to rotate left and right.

An arm stay 12 is connected to the distal end of the upper boom 10 so as to be rotatable leftward and rightward. The base stay of the arm stay 12 has a left end and a right end, as shown in FIGS.
A pair of right bracket portions 12A, 12A is provided upright.

Reference numeral 13 denotes a bar-shaped link provided between the lower boom 8 and the arm stay 12, and the link 13 constitutes a parallel link mechanism with the upper boom 10, as shown in FIG. Offset cylinder 1
When the arm stay 12 is rotated leftward and rightward, the arm stay 12 is held substantially parallel to the lower boom 8.

An arm 14 is connected to the distal end of the arm stay 12 so as to be rotatable upward and downward. As shown in FIGS. 1 and 2, a pair of left and right arms is provided at the proximal end of the arm 14. Bracket portions 14A, 14A are erected. The arm 14 is turned up and down by an arm cylinder 15.

An arm cylinder 15 is provided between the arm stay 12 and the arm 14 so as to be extendable and contractible. The arm cylinder 15 includes a tube 15A and the tube 15A.
And a rod 15B slidably inserted therein. One end of the tube 15A is rotatably mounted between the bracket portions 12A of the arm stay 12 by the connection pins 16. In addition, tube 15A
The other end, which is the bottom side 15C, is a free end, and the bottom side 15C is disposed above the upper boom 10.

The rod 15 of the arm cylinder 15
B has a distal end protruding from the tube 15A so as to be extendable and contractable, and the protruding end is rotatably mounted between the bracket portions 14A of the arm 14 by connecting pins 17.

Here, when the arm cylinder 15 is contracted, the arm 14 rotates upward with respect to the upper boom 10 and the arm stay 12 as shown by a solid line in FIG.
When the arm cylinder 15 is extended, the arm 14 rotates downward (in the direction of arrow B) so that the arm 14 is folded toward the upper boom 10 as indicated by a virtual line in FIG.

Reference numeral 18 denotes a bucket as a working tool provided on the distal end side of the arm 14. The bucket 18 is turned up and down by a bucket cylinder 19 to perform excavation work such as earth and sand.

Reference numeral 21 denotes a left side surface portion 10C of the upper boom 10.
A rod-like member as a projection provided on the rod-like member 2
As shown in FIGS. 3 and 4, 1 is formed as a long rod-like body made of, for example, a metal material, a resin material, or the like, and the base end side is attached to the left side surface portion 10C of the upper boom 10 via an elastic connecting member 22 described later. ing. The distal end of the rod-shaped member 21 is a free end, and the upper surface 10A of the upper boom 10
The cab 4 protrudes above the cab 4 with a certain protrusion dimension L, and the operator in the cab 4 can always visually check the tip side of the rod-shaped member 21.

Here, the protrusion dimension L of the rod-like member 21 substantially corresponds to the height position when the bottom side 15C of the arm cylinder 15 moves to the uppermost position with respect to the upper boom 10 as shown by the phantom line in FIG. The height position when the bottom side 15C of the arm cylinder 15 moves to the uppermost position can be confirmed by visually observing the distal end side.

Reference numeral 22 denotes an elastic connecting member formed by using, for example, a coil spring or the like. The elastic connecting member 22 has its base end side fastened to a mounting bracket 24 on the upper boom 10 side by using a mounting screw 23. A bar-shaped member 21 is provided on the tip side.
Is fixed. The mounting bracket 24 is fixed to the left side surface portion 10C of the upper boom 10 by means such as welding.

The elastic connecting member 22 is connected to the rod-shaped member 21.
Is elastically attached to the upper boom 10 in a state where it can be displaced in the radial direction, and even if the bar-shaped member 21 makes contact with a surrounding obstacle or the like, the bar-shaped member 21 is flexibly deformed to prevent damage to the obstacle. At the same time, the rod-shaped member 21 is prevented from being damaged.

The hydraulic shovel according to the present embodiment has the above-described configuration, and its operation will be described below.

First, when performing a trench excavation work by a hydraulic excavator, the upper boom 10 is rotated left and right by expanding and contracting the offset cylinder 11.
The arm 14 and the like move (offset) to the left or right side of the upper swing body 2 while maintaining a state substantially parallel to the lower boom 8 by the link 13. Then, in this state, the lower boom 8, the arm 14, and the bucket 18 are rotated (elevated).
By doing so, the gutter work can be performed favorably.

During the excavation operation, as shown in FIG. 1, when the arm 14 is turned downward by the operator extending the arm cylinder 15, the arm cylinder 15 is moved forward with the connecting pin 16 as a center. The bottom side 15C moves upward in the arrow C direction.

In a state where the upper boom 10 is held substantially horizontally, for example, when the arm 14 is turned downward to the position closest to the upper boom 10 as shown by a virtual line in FIG. 15C
Moves to the uppermost position with respect to the upper boom 10 and projects obliquely rearward from the upper surface portion 10A.

In this case, as shown in FIG. 2, when the excavation work is performed with the arm 14 or the like offset to the right, for example, the operator in the cab 4 can move the arm cylinder 15 projecting above the upper boom 10. The bottom side 15C may be obstructed by the lower boom 8, the upper boom 10, or the like, and may not be seen.

However, in the present embodiment, since the bar-shaped member 21 for confirming the height position of the bottom side 15C of the arm cylinder 15 is provided on the left side surface portion 10C of the upper boom 10, the operator is provided with the bottom of the arm cylinder 15. Even when the side 15C is not directly visible, the position where the bottom side 15C protrudes most easily can be easily grasped by visually observing the distal end side of the rod-shaped member 21.

Then, the operator can smoothly operate the lower boom 8, the upper boom 10, the arm 14, and the like while measuring the distance between, for example, an upper obstacle or the like and the distal end side of the rod-shaped member 21.

Accordingly, the bottom side 1 of the arm cylinder 15
5C can be reliably prevented from contacting surrounding obstacles, etc.
The burden on the operator can be reduced, and the work efficiency at the time of gutter work can be improved.

Further, since the rod-shaped member 21 is attached to the upper boom 10 by the elastic connecting member 22,
For example, the rod-like member 21 is moved forward and backward by the elastic connector 22,
It can be elastically supported in a state where it can bend to the left, right, etc., and even when the rod-shaped member 21 comes into contact with an obstacle or the like during excavation work,
The damage can be prevented and the durability can be improved.

Next, FIGS. 5 and 6 show a second embodiment according to the present invention.
This embodiment is characterized in that a rod-shaped member as a projection is provided on the bottom side of the arm cylinder. In the present embodiment, the first
The same reference numerals are given to the same components as those of the embodiment, and the description thereof will be omitted.

Reference numeral 31 denotes a rod-shaped member as a projection used in the hydraulic shovel of the present embodiment.
For example, it is formed as a long and thin rod-shaped body made of a metal material having elasticity, an elastic resin material, or the like, and has a base end on the bottom side 15C of the arm cylinder 15 using a mounting ring 32 or the like described later.
And protrudes substantially horizontally toward the left side when viewed from the rear of the vehicle, for example, toward the side facing the cab 4 with the leading end side being a free end.

Then, the rod-shaped member 31 is positioned at a position in the cab 4 where the operator can view it.
Is arranged at a height position substantially equal to the bottom side 15C, and allows the operator to confirm the height position of the bottom side 15C.

Reference numeral 32 denotes the rod-shaped member 31
A substantially C-shaped mounting ring to be mounted on the mounting ring 32
As shown in FIG. 6, is fitted to the outer periphery of the bottom side of the arm cylinder 15 with a tightening margin by a mounting screw 33 and is fixed integrally with the arm cylinder 15. The rod-shaped member 31 is fixed to the bottom side 15C of the arm cylinder 15 using the mounting ring 32 by attaching the mounting screw 33 to the base end side of the rod-shaped member 31 via the mounting ring 32. It is.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
Since the rod-shaped member 31 is provided on the bottom side 15C of the arm cylinder 15, the operator can always accurately grasp the height position of the bottom side 15C by the rod-shaped member 31 that moves together with the arm cylinder 15.

Further, since the rod-shaped member 31 is formed by using, for example, a metal material having elasticity, an elastic resin material, or the like, even if the rod-shaped member 31 comes into contact with surrounding obstacles or the like during the excavation operation, the rod-shaped member 31 is not disturbed. The member 31 can elastically bend and deform, preventing damage to the rod-shaped member 31 and improving durability.

Next, FIG. 7 shows a third embodiment according to the present invention. In this embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and description thereof is omitted. It shall be. However, a feature of the present embodiment is that the bar-shaped member 41 is provided on the bottom side 15C of the arm cylinder 15, and the base end thereof is fastened to the screw seat 43 by the mounting screw 42.

Here, the rod-shaped member 41 is formed substantially in the same manner as the rod-shaped member 31 described in the second embodiment.
Projecting in a substantially horizontal direction toward the side facing the cab 4 side. However, the boss 4 is provided on the base end side of the rod-shaped member 41.
1A is provided, and the boss 41A is fastened to a screw seat 43 provided on the arm cylinder 15 by a mounting screw 42.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the second embodiment can be obtained.

Next, FIG. 8 shows a fourth embodiment according to the present invention, which is characterized in that a bar-shaped member as a projection is provided on a link. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 51 denotes a rod-shaped member as a projection according to the present embodiment. The rod-shaped member 51 is formed substantially in the same manner as the rod-shaped member 21 described in the first embodiment. It projects above the upper surface 10A of the upper boom 10 with a certain projecting dimension, and this projecting dimension substantially corresponds to the height position when the bottom side 15C of the arm cylinder 15 moves to the uppermost position with respect to the upper boom 10. are doing.

However, the rod-like member 51 according to the present embodiment
Is an elastic connector 5 whose base end side is made of, for example, a coil spring.
2, and is attached to the outer peripheral side of the link 13 together with the attachment ring 53 by an attachment screw 54 or the like in this state.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those in the first embodiment can be obtained, and the operator can move the tip side of the rod-shaped member 51 from inside the cab 4. Bottom side 15 by visual inspection
The position where C projects most upward can be easily grasped, the burden on the operator can be reduced, and the work efficiency at the time of gutter work can be improved.

In the present embodiment, in particular, since the bar-shaped member 51 is provided on the link 13 located closer to the cab 4 than the upper boom 10, the bar-shaped member 51 can be arranged at a position that is easy for the operator to see, and its visibility is improved. The height can be increased, and the mounting of the rod-shaped member 51 can be easily performed.

In the first embodiment, the rod-shaped member 21 is attached to the upper boom 10 by using the elastic connecting member 22. However, the present invention is not limited to this, and the attaching member made of an elastic resin material or the like is used. The rod-shaped member 21 may be attached to the upper boom 10 by using the above method. Further, the projection may be formed as an elongated rod-shaped body using, for example, a metal material having elasticity or an elastic resin material. In this case, the projection is directly attached to the upper boom 10, and the elastic connecting member 22 and the like are attached. The configuration may be omitted.

[0061]

As described above in detail, according to the first aspect of the present invention, since the working device is provided with the protrusion for confirming the position of the arm cylinder, the operator of the construction machine can use the end of the arm cylinder. Even if the part side is not directly visible,
By visually checking the protrusions, the position of the cylinder end side can be confirmed, and this end side can be prevented from contacting surrounding obstacles and the like, for example, while visually measuring the distance between the obstacles and the protrusions, The working device can be operated smoothly. Therefore, the burden on the operator during civil engineering work can be reduced, and the work efficiency can be improved.

According to the second aspect of the present invention, since the projection is constituted by the bar-like member projecting upward from the upper boom, the operator can visually check the tip side of the bar-like member, for example, by adjusting the end of the arm cylinder. The uppermost position when the side moves can be easily grasped, and the civil engineering work can be efficiently performed while measuring the distance between the tip side of the rod-shaped member and an obstacle or the like.

According to the third aspect of the present invention, since the projection is formed by the rod-shaped member attached to the end of the arm cylinder, the operator can move the end of the arm cylinder by the rod-shaped member that moves together with the arm cylinder. The height position can be accurately grasped at all times, and civil works can be performed smoothly while avoiding surrounding obstacles and the like.

According to the fourth aspect of the present invention, the protrusion is constituted by a rod-like member projecting upward from the link.
Since the projecting dimension of the rod-shaped member is configured to correspond to the height position when the end of the arm cylinder is moved to the uppermost position, the height of the end of the arm cylinder is adjusted by the rod-shaped member provided on the link. The working device can be smoothly operated while grasping.

Further, according to the fifth aspect of the present invention, since the projection is formed of an elastically deformable rod-like member, the rod-like member is elastically deformed, for example, to the front, rear, left, right, etc. Even if the rod-shaped member comes into contact with an obstacle or the like during the excavation work, it can be prevented from being damaged and durability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the excavator according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a main part in FIG. 1 showing a rod-shaped member.

FIG. 4 is an enlarged cross-sectional view of the rod-shaped member viewed from the direction of arrows IV-IV in FIG.

FIG. 5 is a plan view showing a hydraulic excavator according to a second embodiment of the present invention.

FIG. 6 is a partial perspective view showing a rod-shaped member attached to the bottom side of the arm cylinder.

FIG. 7 is a partial perspective view showing a rod-shaped member according to a third embodiment of the present invention, together with a bottom side of an arm cylinder.

FIG. 8 is an enlarged view of a main part of an upper boom and the like showing a rod-shaped member according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure (vehicle body) 3 Revolving frame 4 Cab 5 Building cover 6 Counter weight 7 Work device 8 Lower boom 9 Boom cylinder 10 Upper boom 11 Offset cylinder 12 Arm stay 13 Link 14 Arm 15 Arm cylinder 15A Tube 15B Rod 15C Bottom side 18 Bucket (work implement) 19 Bucket cylinder 21, 31, 41, 51 Bar-shaped member (projection)

Claims (5)

[Claims] 1. A vehicle body provided with a driver's seat, and a working device provided on the front side of the vehicle body so as to be able to move up and down, and the working device is mounted on the frame by a boom cylinder to move upward and downward. A lower boom that is raised and lowered, an upper boom provided on the distal end side of the lower boom and rotated left and right by an offset cylinder, and an arm stay provided on the distal end side of the upper boom so as to be rotatable left and right. A link provided between the arm stay and the lower boom for holding the arm stay substantially parallel to the lower boom; and an arm provided on the arm stay and rotated up and down by an arm cylinder. A ditching construction machine comprising: a working tool provided on a tip end side of the arm; wherein the working device confirms an end side of the arm cylinder. It ditch digging for a construction machine is characterized in that a configuration in which a projection for the confirmation arm cylinder position capable. 2. The gutter digging construction machine according to claim 1, wherein the protrusion is formed by a rod-like member having a base end attached to the upper boom and a free end protruding upward at a tip end. 3. The digging construction machine according to claim 1, wherein the protrusion is constituted by a rod-shaped member having a base end attached to an end of the arm cylinder and a tip end being a free end. 4. The gutter digging construction machine according to claim 1, wherein the protrusion is formed by a rod-shaped member having a base end attached to the link and a free end protruding upward at a tip end. 5. The construction machine for guttering according to claim 1, wherein said projection is constituted by an elastically deformable rod-shaped member.