JP2812436B2 - Swiveling excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning type excavating work vehicle capable of digging a trench in a narrow alley or the like.

[0002]

2. Description of the Related Art Conventionally, a pivot for a working machine such as a boom is provided at a position in front of a seat and in front of a revolving frame, and the rear of the revolving frame protrudes from within the width of the traveling device during turning. The technology related to the revolving excavation work vehicle called the standard type backhoe having the configuration has been known. Further, in order to solve the problem that the rear of the turning frame of the standard type backhoe projects during turning, the base of the working machine is arranged on a side of the seat and substantially near the center of the turning frame, By making the whole coffee cup type,
2. Description of the Related Art A technique related to an ultra-small turning type backhoe constituting a turning type excavator is known.

[0003]

Conventionally, there has been a so-called standard type backhoe, but it has the following problems. Since the rear portion of the upper turning frame protruded beyond the width of the traveling device during turning, the rear portion was likely to collide with an obstacle. In particular, when digging at the side of the wall, the body is moved to the side of the wall to dig the side ditch, so when turning to load earth and sand on the truck stopped on the opposite side of the wall, the rear part of the turning frame hits the wall As a result, the upper turning frame could not be turned. Therefore, work in a narrow place was impossible. Then, in order to solve the problem of the standard type backhoe, an ultra-small turning type backhoe was developed. In the case of this ultra-small turning type backhoe, the upper turning frame does not protrude from the width of the traveling device during turning, and therefore fits within the width. Therefore, work in a narrow place becomes possible. However, when digging a gutter, the ultra-small swivel type backhoe can only operate the work implement in the vertical direction, so an offset boom mechanism is required at the top of the boom to operate the work implement in the left-right direction. By providing this offset boom mechanism at the upper part of the boom, when excavating with a bucket at the tip of the arm by tilting the offset boom of the offset boom mechanism to the side groove sideways in the left-right direction when digging the side groove, There was a problem that the offset boom mechanism came into contact with the portion and it was not possible to dig deeper than that. Also, when digging ditches by the wall, dig the dirt in the ditches, raise the work equipment and raise it, and then when turning to transport this soil to the truck bed, offset the boom of the work equipment when digging the ditches. In this state, when the work machine is raised and erected in this state, the rear portion of the arm cylinder of the offset boom mechanism at the eccentric position projects from the turning frame. When the turning frame is turned from this state, the rear portion of the arm cylinder projects from the rear portion of the turning frame, so that the rear portion of the arm cylinder protrudes from the width of the traveling device. Therefore, there is a problem that the arm cylinder comes into contact with the side wall and cannot turn. Further, since the offset boom mechanism exists above the boom constituting the working machine, the weight of the working machine increases. Therefore, when the work machine is extended forward, the work machine is heavy and the balance of the work vehicle is deteriorated. Further, when the working machine is raised and raised, the working machine is heavy, so that the position of the center of gravity of the working vehicle is increased and stability is deteriorated. For this reason, there was a problem that work or running at a high speed was not possible. The present invention is to solve the above-mentioned problem of the ultra-small turning backhoe.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. In claim 1, a swing frame is swingably mounted on the traveling device via a swing table bearing,
A swivel type in which a seat, a bonnet, a counterweight, and the like are disposed on the swivel frame, and a work machine is pivotally supported at a front end of the swivel frame via a work machine pivoting portion so that the work machine can be operated vertically and horizontally. In the excavator, the rearmost dimension of the turning frame is set within the width of the traveling device, and the turning frame is turned when digging the left-hand groove in the traveling direction, so that the left outer ends of the working machine and the traveling device are positioned on substantially the same straight line. When this is done, the work implement pivot at the front end of the turning frame is configured to be located within the left width of the traveling device, and the boom and arm of the work implement are located within the width of the bucket in the left-right direction. It was configured as follows.

According to a second aspect of the present invention, when digging the left-side groove of the turning type excavating work vehicle according to the first aspect, the distance from the turning center of the turning frame to the outer end of the work equipment pivot is determined by the distance of the turning frame. It is configured so as to be less than the distance to the rear largest dimension portion.

[0006]

Next, embodiments of the present invention will be described. FIG. 1 is a right side view of the revolving excavator of the present invention, FIG. 2 is a revolving frame F pivoted to the right, the boom bracket 2 is pivoted to the left, and a plan view of a right trenching posture, and FIG. FIG. 4 is a plan view of the left groove excavation posture by swinging the frame F to the left and swinging the boom bracket 2 to the right.
Is the turning frame F and the counterweights W1, W2, W3
5 is a rear view showing the positions of the turning frame F and the counterweights W1, W2, W3, and FIG. 6 is a fixing bolt 1 of the turning frame F and the counterweight W1.
6, FIG. 7 is a side view of the boom bracket 2, FIG. 8 is a plan view of the boom bracket 2 of FIG. 7, and FIG. 9 is a side cross-sectional view of another embodiment of the boom bracket 2. 10 is a plan view of the boom bracket 2 of FIG.

Referring to FIG. 1, the structure of a turning type excavator will be described. The traveling device is a crawler traveling device 3, and a swivel bearing 6 is arranged on a frame of the crawler traveling device 3. The swivel frame F is supported by the swivel table bearing 6 such that the swivel frame F can be fully swiveled. A counterweight W is arranged at the rear of the revolving frame F, and a boom 1, a bucket arm 11, and a bucket 12 are arranged in front of the counterweight W. The boom 1 is rotated up and down by a boom cylinder 18, the bucket arm 11 is rotated by an arm cylinder 8, and the bucket 12 is scooped and rotated by a bucket cylinder 4. The base of the boom 1 is a turning frame F
The swing cylinder 20 protrudes horizontally from the inside of the revolving frame F in the direction of the boom bracket 2 to support the swing cylinder pivoting projection 7 described later. The part is pivotally supported by a piston part.

A seat S is provided on the left side of the hood 13.
Are arranged, and the canopy 14 is arranged on the seat S. An operation column is arranged in front of the seat S. In the present invention, the base of the boom bracket 2 is arranged not at the side of the seat S but at a position in front of the turning frame F. The lower part of the boom 1 is pivotally supported at the boom pivot hole 2c of the boom bracket 2, and the lower end of the boom cylinder 18 is pivotally supported at the boom cylinder pivot hole 2d of the boom bracket 2.

Next, FIG. 2 and FIG. 3 will be described. The revolving frame F is formed in an arc shape, and the outer diameter Ra of the revolving frame F is contained within the left and right width of the crawler traveling device 3. However, when the crawler-type traveling device 3 is disposed in a normal posture in front as shown by a chain line in FIG. 2, the tip of the boom bracket 2 is in a state of protruding from the outer diameter Ra. In a posture with the minimum width that the crawler-type traveling device 3 can pass in the posture, it is impossible to make a full turn. However, as shown by the solid line in FIG. 2, when the turning frame F is turned rightward and the boom bracket 2 is swung to the left, the part of the swing cylinder pivoting projection 7 of the boom bracket 2 is outside the turning frame F. Diameter R
a, and the turning outer diameter Rb of the tip of the swing cylinder pivoting projection 7 in this case only slightly emerges from the outer diameter Ra, so that the turning frame F can be turned to the very end of the right alley wall. , The bucket 12 can approach parallel to the alley wall in parallel, and the trench can be dug.

However, since the turning outer diameter Rb is larger than the outer diameter Ra, it is impossible to turn the turning frame F further rightward and put the excavated soil on the bed of a truck behind. It is. However, as shown in FIG. 3, by turning the turning frame F to the left, it is possible to turn to the rear. That is, the turning frame F is turned to the left,
When the boom bracket 2 swings to the right, the tip of the boom bracket 2 enters the outer diameter Ra,
The swing cylinder pivot projection 7 also falls within the outer diameter Ra. Therefore, the turning outer diameter Rc of the boom bracket 2 is smaller than the outer diameter Ra, and there is no protrusion from the outer diameter Ra, so that the turning frame F can be fully turned as it is.

However, in FIG. 3, although the bucket 12 is likely to interfere with the alley wall, the bucket 12 is located above the revolving frame F and at a position considerably higher than the alley wall. By arranging, it is possible to make a full turn without interference.

Next, the configuration of the counter weight W will be described with reference to FIGS. By making the revolving frame F arc-shaped and small, and providing a working machine at the front end,
It is necessary to make the counterweight W, which balances the weight of the working machine, somewhat large. However, if a counterweight having a large thickness protruding rearward in plan view is used, the rear largest dimension portion of the turning frame including the counterweight protrudes from within the width of the traveling device. It cannot be a large counterweight. In the present invention, instead of increasing the weight of the counterweight in plan view and increasing the weight, the height of the counterweight W is increased to the height h1 in rear view to increase the weight and balance the weight. It is. The reason why the height is set to h1 is that only the rearmost counterweight W1 having the longest horizontal distance from the turning center 0 is used. The left and right counterweights W2 and W3 have the same conventional height h2.

FIG. 6 is a cross-sectional view of a portion where the counterweight W1 is fixed to the turning frame F. The portion where the counterweight W1 is fixed has a large strength at which the engine stand 15 is fixed to the turning frame F. Part. The counterweight W1 is fixed to the revolving frame F of this portion by a fixing bolt 16.

Next, the structure of the boom bracket 2 will be described with reference to FIGS. 7, 8, 9 and 10. FIG. 7 and 8
In the embodiment, the swing pivot pin hole 10 at the tip of the boom bracket 2 is inserted into the recess 2a of the boom bracket 2, and a distance t1 + t2 from the boom cylinder pivot hole 2d is required. is there. However, in the case of the embodiment shown in FIGS. 9 and 10, the portion of the swing pivot pin hole 10 of the boom bracket 2 is formed as an external fitting type, so that it is located outside the swing pivot pin hole 2b of the boom bracket 2. Since it is configured to be inserted, the distance from the swing pivot pin hole 10 to the boom cylinder pivot hole 2d can be configured to be close to only t1. The boom pivot hole 2c of the boom bracket 2 is a bracket for pivotally supporting the boom 1, and the boom cylinder pivot hole 2d is a bracket for pivotally supporting the boom cylinder 18. The swing cylinder pivoting projection 7 protrudes from the right side of the boom bracket 2, but the swing cylinder pivoting projection 7 may be on the left side of the boom bracket 2.

[0015]

As described above, the present invention has the following advantages. Conventionally, there has been a so-called standard backhoe, but it has the following problems. Since the rear portion of the upper turning frame protruded beyond the width of the traveling device during turning, the rear portion was likely to collide with an obstacle. In particular, when digging at the side of the wall, the body is moved to the side of the wall to dig the side ditch, so when turning to load earth and sand on the truck stopped on the opposite side of the wall, the rear part of the turning frame hits the wall As a result, the upper turning frame could not be turned. Therefore, work in a narrow place was impossible.

In order to solve the problems of the standard type backhoe, an ultra-small turning type backhoe has been developed.
In the case of this ultra-small turning type backhoe, the upper turning frame does not protrude from the width of the traveling device at the time of turning, and therefore fits within the width. Therefore, work in a narrow place is possible. However, when digging a gutter, the ultra-small swivel type backhoe can only operate the working machine in the vertical direction,
In order to operate the work machine in the left-right direction, an offset boom mechanism is required at the top of the boom. By providing this offset boom mechanism at the upper part of the boom, when excavating with a bucket at the tip of the arm by tilting the offset boom of the offset boom mechanism to the side groove sideways in the left-right direction when digging the side groove, There is a problem that the offset boom comes into contact with the portion, and it is not possible to dig deeper than that. Also, when digging ditches by the wall, dig the dirt in the ditches, raise the work equipment and raise it, and then when turning to transport this soil to the truck bed, offset the boom of the work equipment when digging the ditches. In this state, when the work machine is raised and set up,
The rear part of the arm cylinder of the offset boom mechanism at the eccentric position projects from the turning frame. When the turning frame is turned from this state, the rear portion of the arm cylinder projects from the rear portion of the turning frame, so that the rear portion of the arm cylinder protrudes from the width of the traveling device.
Therefore, there is a problem that the arm cylinder comes into contact with the side wall and cannot turn. Also, since there is an offset boom mechanism at the top of the boom that constitutes the work machine,
The work equipment becomes heavy. Therefore, when the work machine is extended forward, the work machine is heavy and the balance of the work vehicle is deteriorated. Further, when the working machine is raised and raised, the working machine is heavy, so that the position of the center of gravity of the working vehicle is increased and stability is deteriorated. For this reason, there was a problem that work or running at a high speed was not possible.

The first aspect of the present invention solves the problem of the ultra-small turning type backhoe, and has the following effects. Firstly, since the working machine is pivotally supported at the front end of the revolving frame so as to be operable in the vertical and horizontal directions, and the maximum rear dimension of the revolving frame is set within the width of the traveling device, the upper revolving body is provided. Of the turning frame does not collide with an obstacle during turning. Secondly, particularly when digging a gutter, the work machine is pivotally supported at the front end of the turning frame so as to be operable in the vertical and horizontal directions, and the rearmost maximum dimension of the turning frame is within the width of the traveling device. Therefore, there is no need for an offset boom mechanism, and the rear part of the turning frame can be turned within the width of the traveling device. Thereby, the rear part of the turning frame can turn within the width of the traveling device, and the disadvantage that the offset boom hits the edge of the groove when digging the side groove and cannot be dug deeply does not occur. In the present invention, at the time of digging the left groove in the traveling direction, the turning frame can be turned to a position where the direction of the left groove and the direction of the boom and the arm coincide with each other.
When the left outer end of the working machine and the left outer end of the traveling device are positioned on substantially the same straight line, the boom and the arm of the working machine can be placed in the trench excavated by the bucket, and the trench can be dug, and the trench can be dug deep. Third, in the ultra-small swivel type backhoe, the arm cylinder projects from the swivel frame rearward in the advancing direction when the work implement is raised and erected because the offset boom mechanism is present when digging a side ditch near a wall. Therefore, when the revolving frame is revolved in this state, the arm cylinder interferes with the upper portion of the side wall, so that there is a problem that the revolving frame cannot be revolved. In the present invention, a pivot portion for pivotally supporting the working machine in the vertical and horizontal directions is provided at the front end of the turning frame,
Since the rear largest dimension portion of the turning frame is set to be within the width of the traveling device, the offset boom mechanism is not required, so that the arm cylinder does not protrude from the turning frame when the working machine is set up. Therefore, at the time of turning, the rear portion of the arm cylinder does not protrude from the width of the traveling device.
Therefore, it was possible to dig a gutter by the wall, and furthermore, it became possible to turn the turning frame for loading the digged earth and sand on the truck on the opposite side of the wall. Fourth, since the work machine does not require an offset boom mechanism, the work machine becomes lighter, so that the front-rear balance of the machine is not deteriorated. Work and traveling at a high speed.

According to a second aspect of the present invention, when digging the left-hand groove in the traveling direction, the digging is performed, and when the work machine is raised and raised for turning, the position of the bucket is higher than the upper end of the side wall. For example, even if the position of the bucket is out of the side wall at the time of turning, since the work equipment pivot at the front end of the turning frame is arranged within the width of the traveling device, the turning frame can be turned as it is. You can turn it to the left to load earth and sand on the truck located behind. Therefore, it is not necessary to make a right turn when digging a left ditch in the traveling direction at the wall, and a short turn to the left of the transfer path can be made, so that the turn transfer can be completed in a short time.

[Brief description of the drawings]

FIG. 1 is a right side view of a swing type excavator according to the present invention.

FIG. 2 is a plan view of a right-side ditching posture in which a turning frame F is turned rightward and a boom bracket 2 is swung leftward.

FIG. 3 is a plan view of a left-side groove digging posture in which a turning frame F is turned leftward and a boom bracket 2 is swung rightward.

FIG. 4 shows a turning frame F and counterweights W1 and W2.
-The top view which shows the position of W3.

FIG. 5 shows a turning frame F and counterweights W1 and W2.
-Rear view showing the position of W3.

FIG. 6 is a side sectional view of a fixing portion of the revolving frame F and the counterweight W1 by a fixing bolt 16;

FIG. 7 is a side view of the boom bracket 2.

FIG. 8 is a plan view of the boom bracket 2 of FIG.

FIG. 9 is a side sectional view showing another embodiment of the boom bracket 2.

FIG. 10 is a plan view of the boom bracket 2 of FIG. 9;

[Explanation of symbols]

 F Swivel frame W Counterweight O Swivel center 1 Boom 2 Boom bracket 3 Crawler traveling device 4 Bucket cylinder 6 Swivel table bearing 7 Swing cylinder pivoting projection 8 Arm cylinder 9 pivoting bracket 11 bucket arm 12 bucket

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-51-67602 (JP, A) JP-A-61-76850 (JP, U) JP-A-63-71257 (JP, U) 4944 (JP, U) Japanese Utility Model Application Hei 1-75169 (JP, U) Japanese Utility Model Application Utility Model 57-202461 (JP, U) Japanese Utility Model Application Utility Model 1-164337 (JP, U) (58) Field surveyed (Int. ⁶ , DB name) E02F 9/08 E02F 3/32

Claims (2)

(57) [Claims] 1. A swivel frame is pivotally mounted on a traveling device via a swivel table bearing, and a seat, a bonnet, a counterweight, and the like are arranged on the swivel frame. In a revolving type excavating work vehicle that is pivotally supported via a work implement pivot part so that the machine can be operated in the vertical and horizontal directions, the maximum dimension behind the revolving frame is within the width of the traveling device, and when digging the left groove in the traveling direction When the turning frame is turned and the left outer end of the working machine and the traveling device are positioned on substantially the same straight line, the work machine pivot at the front end of the turning frame is positioned within the left width of the traveling device. And a boom and arm of the working machine are located within a width of the bucket in the left-right direction. 2. The digging work vehicle according to claim 1, wherein when digging a left-hand groove, the distance from the turning center of the turning frame to the outer end of the work implement pivot is set to a distance between the turning end of the turning frame and the maximum dimension. A turning type excavator, wherein the excavator is configured to be shorter than the distance.