JPH09217375A - Working machine mounting structure for power shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch the angle between a first boom and a second boom to the variable state and the constant state by vertically rocking the first boom. SOLUTION: A seventh pin 24 for connecting an angle regulating beam 23 to a super structure 11 is movable to positions conformed to and isolated from a first pin 13 for mounting a first boom 12 to the super structure 11. The seventh pin 24 is conformed to the first pin 13, whereby the first boom 12 and a second boom 17 can be vertically moved with the angle between the both being constant, and the seventh pin 24 is isolated from the first pin 13, whereby the angle between the first boom 12 and the second boom 17 is successively changeable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine mounting structure for a power shovel.

[0002]

2. Description of the Related Art In a general power shovel, an upper swing body is swingably mounted on a lower traveling body, a boom is swingably mounted on the upper swing body, and an arm is swingably mounted on the boom. A work machine is known in which a bucket is attached to the arm so as to be vertically swingable.

In such a power shovel, the boom and arm are lengthened to increase the maximum distance from the turning center to the arm tip, and the boom is substantially V-shaped so that the distance between the boom tip and the ground is short. Thus, the working range is widened.

For this reason, when the boom is swung upward as much as possible to a standing posture, and when the arm is swung downward as much as possible, the distance from the turning center to the arm tip portion becomes long, and the arm tip portion is obstructed. May interfere with the vehicle, and the minimum turning radius is large, which makes it difficult to work in a narrow area.

[0005] Various work excavator mounting structures for power shovels have been proposed that solve this problem and allow easy work in a narrow area. For example, the one disclosed in JP-A-7-11664 has been proposed.

As shown in FIG. 1, the work machine mounting structure of this power shovel is such that an upper swing body 2 is swingably mounted on a lower traveling body 1, and a first boom 3 is vertically swingable on the upper swing body 2. The boom cylinder 4 is attached to the first boom 3 and the upper swing body 2, and the second boom 5 is vertically swingably attached to the first boom 3.
And an upper swing body 2 are connected to each other, and an arm 7 is attached to the second boom 5 by an arm cylinder (not shown) so as to be vertically swingable, and a bucket 8 is vertically moved on the arm 7 by a bucket cylinder (not shown). It is swingably attached.

With such a work machine mounting structure, when the boom cylinder 4 is extended and the first boom 3 is in the upright posture, the second boom 5 is pushed upward by the angle adjusting rod 6 so that the first boom 3 and the second boom 3 The angle (narrow angle) α with the boom 5 becomes large, and the distance between the turning center a and the arm tip portion 7a becomes short, so that the minimum turning radius can be made small.

Further, when the boom cylinder 4 is contracted to bring the first boom 3 to the lying posture as shown by the phantom line in FIG. 1, the second boom 5 is pushed downward by the angle adjusting rod 6 and the first boom 3 and the first boom 3 Since the angle α with the 2 boom 5 becomes smaller and the boom tip 5a approaches the ground surface b, the working range can be widened.

[0009]

In the work implement mounting structure for the power shovel described above, when the first boom 3 is swung upward from the lying position to the standing position, the angle adjusting rod 6 causes the first boom 3 to move. Since the angle α between the second boom 5 and the second boom 5 gradually increases, the upward movement amount of the arm tip portion 5a sequentially becomes larger than a value commensurate with the extension stroke of the boom cylinder 4.

For this reason, the lifting force of the arm tip portion 7a becomes smaller than the value commensurate with the thrust of the boom cylinder 4 by the above-described upward swing amount, which is gradually increased. When performing work (sliding work), the maximum hoisting load becomes smaller than that of a general work machine mounting structure, and in order to achieve the same hoisting load, a hydraulic pump for supplying pressure oil to the boom cylinder 4 is driven. It is necessary to increase the engine output, to increase the hydraulic pressure of the hydraulic pump, and to reduce the weight of the first boom 3, the second boom 5 and the arm 7.

Further, the upward swing amount (upward swing speed) of the arm tip portion 7a with respect to the extension stroke of the boom cylinder 4 is larger (faster) than that of a general working machine mounting structure.
As a result, the slinging work described above cannot be performed in the same sense as a general working machine mounting structure, which makes it difficult for the operator to carry out the slinging work.

That is, the pressure oil discharged from the hydraulic pump is supplied to the boom cylinder 4 by the operation valve, and the operator operates the operation valve to control the amount of pressure oil supplied to the boom cylinder 4 during slinging work. The extension speed of the boom cylinder 4 is controlled to lift the load by setting the upward swing amount (speed) of the arm tip portion 7a to a very low speed, but the work machine mounting structure shown in FIG. 1 and the normal work machine mounting structure are operated. Even if the operation stroke of the valve is the same, the amount of upward swing of the boom tip (speed) is different, so slinging work cannot be performed with the same feeling.

Therefore, an object of the present invention is to provide a work machine mounting structure for a power shovel capable of solving the above-mentioned problems.

[0014]

According to a first aspect of the present invention, an upper swing body 11 is rotatably attached to a lower traveling body 10, and a first boom 12 is attached to the upper swing body 11 by a first pin 13. Vertically swingable, second boom 17 vertically swingably mounted on the first boom 12, arm 19 vertically swingably mounted on the second boom 17, and a work tool is mounted on the arm 19. The angle adjustment rod 23 is provided between the upper swing body 11 and the second boom 17 with the seventh pin 24 and the eighth boom.
In a work machine mounting structure for a power shovel that is connected by a pin 25, a seventh pin 24 that connects the angle adjusting rod 23 to the upper swing body 11 and a first pin 13 that mounts the first boom 12 to the upper swing body 11 are used. A working machine for a power shovel capable of moving between a substantially coincident first position and a second position in which the first boom 12 and the angle adjusting rod 23 are X-shaped apart from the first pin 13 thereof. It is a mounting structure.

According to the first invention, the seventh pin 24 is the first
If the second position is set apart from the pin 13, the first boom 1
By swinging 2, the angle between the first boom 12 and the second boom 17 is sequentially changed, and the seventh pin 24 is moved to the first pin 13
If the first position coincides with, the first boom 12 can be swung with the angle between the first boom 12 and the second boom 17 kept constant. Therefore, the work range can be increased and the minimum turning radius can be reduced during normal work, the hoisting load can be increased during sling work, and the power shovel can be operated in the same sense as a work implement mounting structure.

According to a second aspect of the invention, a movable body 29 is movably provided on the upper swing body 11 of the first invention, and the movable body 2 is movable.
9, the angle adjusting rod 23 is connected by the seventh pin 24, the movable body 29 and the cylinder 31 are connected across the upper swing body 11, and the movable body 29 is moved by extending and contracting the cylinder 31. The seventh pin 24 is in the first position,
It is a work machine mounting structure of a power shovel that is adapted to move to the position.

According to the second invention, the seventh pin 24 is moved to the first position by expanding and contracting the cylinder 31.
Since it can be moved to the second position, its operation is easy.

In the third invention, a movable body 29 is movably provided on the upper swing body 11 in the first invention, and the movable body 2 is provided.
A means for fixing the movable body 29 to the upper swing body 11 so that the seventh pin 24 is at the first position and the second position is connected to the angle adjusting rod 23 by means of the seventh pin 24. It is a work machine mounting structure for a power shovel.

According to the third invention, by fixing the movable body 29 to the upper swing body 11, the seventh pin 24 is moved to the first position,
Since it is in the second position, the seventh pin 24 can be firmly supported at the first position and the second position.

In a fourth aspect of the present invention, an upper revolving structure 11 is rotatably attached to a lower traveling structure 10, and the upper revolving structure 11 has a first structure.
The boom 12 is attached so as to be vertically swingable by the first pin 13, the second boom 17 is vertically swingably attached to the first boom 12, and the arm 19 is vertically swingably attached to the second boom 17. A work tool is attached to the arm 19, and an angle adjusting rod 23 is provided between the upper swing body 11 and the second boom 17.
In the working machine mounting structure of the power shovel, in which the above are connected by the seventh pin 24 and the eighth pin 25, the angle adjusting rod 23
The seventh pin 24 for connecting the
It is assumed that the boom 12 is separated from the first pin 13 attached to the upper swing body 11 so that the first boom 12 and the angle adjusting rod 23 have an X shape, and the angle adjusting rod 23 is extendable and retractable. A means for locking the adjusting rod 23 so as not to expand and contract is provided, and a means for fixing the first boom 12 and the second boom 17 at a predetermined angle is detachably attached across the first boom 12 and the second boom 17. It is a work machine mounting structure for a power shovel characterized by being provided.

According to the fourth invention, if the angle adjusting rod 23 is locked so as not to expand and contract, the angle between the first boom 12 and the second boom 17 is sequentially changed by swinging the first boom 12. Then, if the angle adjusting rod 23 is expanded and contracted, the first boom 12 can be swung while keeping the angle between the first boom 12 and the second boom 17 constant. Therefore, the work range can be increased and the minimum turning radius can be reduced during normal work, and the lifting load can be increased during sling work.
It can be operated in the same way as a normal excavator work machine mounting structure.

In a fifth aspect of the invention, the angle adjusting rod 23 in the fourth aspect of the invention is a cylinder, and its extension chamber 23a and contraction chamber 2 are provided.
3b is a working machine mounting structure for a power shovel, in which a fluid is sealed in 3b and communicated by a short circuit 44, and an opening / closing valve 45 is provided in the short circuit 44 as a locking means.

According to the fifth aspect of the invention, since the on-off valve 45 can be switched between the open position and the closed position, the operation becomes simple.

In a sixth aspect of the invention, the angle adjusting rod 23 in the fourth aspect of the present invention is configured such that a rod 52 is telescopically fitted in a tubular body 51, and the lock pin 5 extends between the tubular body 51 and the rod 52.
3 is a work implement mounting structure for a power shovel, in which 3 is detachably provided as a locking means.

According to the sixth aspect of the present invention, since the lock pin 53 can be attached or detached, the operation is simple and the lock pin 53 locks the cylinder body 51 and the rod body 52, so that the lock pin 53 is firmly locked. Operation is reliable.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG.
An upper revolving structure 11 is attached to 0 so as to be freely rotatable. In the upper swing body 11, the base end portion of the first boom 12 is the first pin 1
It is attached so that it can swing up and down with the first boom 12
And the boom cylinder 14 is the second
It is connected by a pin 15 and a third pin 16. A base end portion of a second boom 17 is attached to a tip end portion of the first boom 12 by a fourth pin 18 so as to be vertically swingable.
An arm 19 is attached to a tip portion of 7 by a fifth pin 20 so as to swing up and down. A work tool, for example, a bucket 21 is attached to the tip of the arm 19 by a sixth pin 22 so as to be vertically swingable. The arm 19 swings up and down by an arm cylinder (not shown), and the bucket 21 swings up and down by a bucket cylinder (not shown).

The angle adjusting rod 23 extends between the upper swing body 11 and the base end of the second boom 17 near the seventh pin 24 and the eighth pin 24.
It is connected by a pin 25 so as to be vertically swingable. The seventh pin 24 is mounted at the same height as the first pin 13 and is movable in the front-rear direction. The eighth pin 25 is displaced forward of the fourth pin 18.

Next, the mounting structure of the upper swing body 11 of the first boom 12 and the angle adjusting rod 23 will be described. As shown in FIGS. 3 and 4, a bracket 26 is fixed to the upper swing body 11, and a base end portion of the first boom 12 is attached to the bracket 26 by a first pin 13 so as to be vertically swingable. A guide body 27 is mounted adjacent to the bracket 26 in the front-rear direction, and a convex portion 30 of a movable body 29 is slidably fitted in the guide concave portion 28 of the guide body 27 in the front-rear direction.
The cylinder 3 extends between the movable body 29 and the upper swing body 11.
An angle adjusting rod 23 is attached to the movable body 29 by a seventh pin 24 so as to be vertically swingable.

As shown in FIG. 5, the cylinder 31 contracts when pressure oil is supplied to the compression chamber 32, and when the compression stroke end is reached, the movable body 29 is moved to the separated position shown by the solid line in FIG. When the pressure oil is supplied to 33, the extension operation is performed, and when the extension stroke end is reached, the movable body 29 becomes the matching position shown by the phantom line in FIG.

As shown by the phantom line in FIG. 3, the guide body 27 may be provided with the first stopper 34 and the second stopper 35 to position the movable body 29 at the separated position and the matching position. Cylinder 31 does not have to contract until the end of the extension stroke.

As shown in FIG. 5, the discharge pressure oil of the hydraulic pump 37 driven by the engine 36 is supplied to the compression chamber 32 and the expansion chamber 33 of the cylinder 31 by the operation valve 38, and the operation valve 38 is operated by the lever 39. The neutral position B, the retracted position C, and the extended position D are switched.

Next, the operation will be described. When the operation valve 38 is set to the contracted position C by the lever 39, the discharge pressure oil of the hydraulic pump 37 is supplied to the contraction chamber 32 of the cylinder 31, the cylinder 31 contracts to the stroke end, and the movable body 29 becomes the separated position.

As a result, the seventh pin 2 of the angle adjusting rod 23
4 is located rearward of the first pin 13 of the first boom 12, and the angle adjusting rod 23 and the first boom 12 are in an X shape, so that the angle between the first boom 12 and the second boom 17 is the first. The boom 12 is gradually increased in size by swinging the boom 12 upward from the lying posture toward the standing posture.

When the operating valve 38 is set to the extended position D by the lever 39, the discharge pressure oil of the hydraulic pump 37 is supplied to the extension chamber 33 of the cylinder 31, the cylinder 31 reaches the extension stroke end position, and the movable body 29 coincides with the matching position. Become.

As a result, the seventh pin 2 of the angle adjusting rod 23
Since the center of 4 is at the same position in the front-back direction and the vertical direction as the center of the first pin 13 of the first boom 12, the angle adjusting rod 23
Does not function, and the first boom 12 and the second boom 17 maintain the same angle and swing up and down based on the stroke of the boom cylinder 14.

The operation valve 38 may be of an electromagnetic switching type, and the solenoid may be energized to control the switching operation by turning the switch on and off.

Next, a second embodiment of the present invention will be described. FIG.
As shown in FIG. 7 and FIG. 7, a bolt hole 40 is formed in the movable body 29, a first bolt insertion hole 41 and a second bolt insertion hole 42 are formed in the guide body 27, and a bolt 43 is inserted from the first bolt insertion hole 41. The movable body 29 is fixed to the bolt hole 40 by screwing the movable body 29 in FIG.
Fixed to the separated position shown by the solid line in FIG.
By twisting the bolt 43 into the bolt hole 40, the movable body 29 is fixed at the matching position shown by the phantom line in FIG.

Next, a third embodiment of the present invention will be described. FIG.
As shown in FIG. 9, the angle adjusting rod 23 is made of a telescopic member, for example, a cylinder, and the expansion chamber 23a and the contraction chamber 23b thereof are filled with a fluid and communicated with each other through a short circuit path 44 as shown in FIG. An on-off valve 45 is provided in this short circuit path 44.

The on-off valve 45 is in the closed position E by the spring 46, and is in the open position F when the solenoid 47 is energized. This solenoid 47 has a power source 49 via a switch 48.
Connected to

Since this is the case, the switch 48 is turned off.
If it is set to F, the on-off valve 45 is set to the closed position E, so that the fluid does not move to the expansion chamber 23a and the contraction chamber 23b of the cylinder, so that the cylinder is locked so as not to expand and contract due to an external force.

Therefore, when the first boom 12 is swung up and down, the angle between the first boom 12 and the second boom 17 is changed by the angle adjusting rod 23.

When the switch 48 is turned on and the solenoid 47 is energized, the open / close valve 45 is set to the open position F, and the fluid freely flows in the extension chamber 23a and the compression chamber 23b of the cylinder, so that the cylinder expands and contracts by an external force.

Therefore, since the cylinder expands and contracts when the first boom 12 is swung up and down, the angle adjusting rod 23
Does not fulfill its function. In this case, the link 50 is connected between the first boom 12 and the second boom 17 to fix the first boom 12 and the second boom 17 at a predetermined angle.

Next, a fourth embodiment of the present invention will be described. FIG.
As shown in FIG. 0, the angle adjusting rod 23 is provided in the cylindrical body 51.
2 is slidably inserted to make it expandable and contractible, and the cylinder body 51 is fitted with the lock pin 53 to the rod body 52 so that the cylinder body 51 and the rod body 52 are locked so as not to extend and contract.

In this way, the lock pin 53 is fitted to perform the function of the angle adjusting rod 23, and the lock pin 53 is pulled out so that the function of the angle adjusting rod 23 is not fulfilled.

[Brief description of drawings]

FIG. 1 is a front view of a conventional example.

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

FIG. 3 is a partially cutaway front view showing a mounting portion of a first boom and an angle adjusting rod.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a hydraulic circuit diagram.

FIG. 6 is a partially cutaway front view of a first boom and an angle adjusting rod mounting portion showing a second embodiment of the present invention.

7 is a sectional view taken along line GG of FIG.

FIG. 8 is a front view showing a third embodiment of the present invention.

FIG. 9 is a circuit diagram for connecting the extension chamber and the contraction chamber of the angle adjusting rod.

FIG. 10 is a front view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lower traveling body 2 ... Upper swing body 3 ... 1st boom 4 ... Boom cylinder 5 ... 2nd boom 6 ... Angle adjustment rod 10 ... Lower traveling body 11 ... Upper swing body 12 ... 1st boom 13 ... 1st pin 14 ... Boom cylinder 17 ... Second boom 19 ... Arm 21 ... Bucket 23 ... Angle adjusting rod 24 ... Seventh pin 25 ... Eighth pin 27 ... Guide body 28 ... Recessed portion 29 ... Movable body 30 ... Convex portion 31 ... Cylinder 32 ... Shrinkage Chamber 33 ... Extension chamber 37 ... Hydraulic pump 38 ... Operation valve 40 ... Bolt hole 41 ... First bolt insertion hole 42 ... Second bolt insertion hole 43 ... Bolt 44 ... Short circuit path 45 ... Open / close valve 50 ... Link 51 ... Cylindrical body 52 … Rod 53… Lock pin

Claims (6)

[Claims] 1. An upper revolving structure 11 is rotatably attached to a lower traveling structure 10, and a first boom 12 is attached to the upper revolving structure 11 by a first pin 13 so as to be vertically swingable. The two booms 17 are attached so as to be vertically swingable, the arms 19 are attached to the second boom 17 so as to be vertically swingable, and the working tool is attached to the arms 19, and the upper swing body 11 and the second boom 17 are extended. Set the angle adjustment rod 23 to the 7th pin 2
In the work machine mounting structure of the power shovel connected by the 4th and 8th pins 25, the 7th pin 24 connecting the angle adjusting rod 23 to the upper swing body 11 is attached to the upper swing body 11 by the 7th pin 24. The first boom 12 and the angle adjusting rod 23, which are spaced apart from the first position substantially coincident with the first pin 13 and the first pin 13.
A structure for mounting a work machine of a power shovel that is movable across a second position where the X shape is formed. 2. A movable body 29 is movably provided on the upper swing body 11, and an angle adjusting rod 23 is connected to the movable body 29 by a seventh pin 24. The movable body 29 and the upper swing body 11 are connected to each other. The cylinder 31 is connected, and the movable body 29 is moved by the extension operation and the contraction operation of the cylinder 31 so that the seventh pin 24 is moved to the first position and the second position. Power shovel work machine mounting structure. 3. A movable body 29 is movably provided on the upper swing body 11, an angle adjusting rod 23 is connected to the movable body 29 by a seventh pin 24, and the movable body 29 is connected to the upper swing body 11.
The work implement mounting structure for a power shovel according to claim 1, further comprising means for fixing the seventh pin 24 so as to be located at the first position and the second position. 4. An upper revolving structure 11 is rotatably attached to a lower traveling structure 10, and a first boom 12 is attached to the upper revolving structure 11 by a first pin 13 so as to be vertically swingable. The two booms 17 are vertically swingably attached, the arms 19 are vertically swingably attached to the second boom 17, and the work tools are attached to the arms 19, and the upper swing body 11 and the second boom 17 are extended. Set the angle adjustment rod 23 to the 7th pin 2
In the work machine mounting structure of the power shovel connected by the 4th and 8th pins 25, the 7th pin 24 connecting the angle adjusting rod 23 to the upper swing body 11 is attached to the upper swing body 11 by the 7th pin 24. The first boom 12 and the angle adjusting rod 23 are separated from the 1-pin 13 so as to form an X shape, and the angle adjusting rod 23 is extendable and retractable. The angle adjusting rod 23 is locked so as not to extend and contract. Means is provided to extend the first boom 12 and the second boom 17 to the first boom.
A work machine mounting structure for a power shovel, wherein a means for fixing the boom 12 and the second boom 17 at a predetermined angle is detachably provided. 5. The angle adjusting rod 23 is a cylinder, and the expansion chamber 23a and the contraction chamber 23b are filled with fluid and communicated with each other through a short-circuit passage 44, and an opening / closing valve 45 is provided in the short-circuit passage 44 to serve as locking means. A work implement mounting structure for a power shovel according to claim 4. 6. The angle adjusting rod 23 is connected to the cylindrical body 51 by the rod 5.
The work machine mounting structure for a power shovel according to claim 4, wherein the two are elastically fitted together, and a lock pin 53 is detachably provided between the cylinder body 51 and the rod body 52 to serve as a locking means.