JPH09158236A - Working device in construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working property by attachably and detachably mounting a blade support arm so that the other working attachment can be mounted instead of a blade. SOLUTION: A support arm 6 having an attachment mounting part 11 on the tip is supported by a support bracket 9 provided on the frame of a lower traveling body through a pin 10 in such a manner as to be vertically oscillating. The tip of the piston rod 8a of a hydraulic cylinder 8 mounted on the support bracket 9 through a pin shaft 8c in such a manner as to be rockable is mounted on a cylinder mounting seat 12 provided on the upper side of the mounting part 11 in such a manner as to be rockable. A blade 7 is positioned by fitting a mounting bracket 16 to the mounting part 11 and bringing a third lock pin 19 into contact with a fixed hook 15. Further, first and second engaging and disengaging hooks 13, 14 are locked by first and second lock pins 18, 19, and the hooks 13, 14 are fixed by bolts 20, whereby the blade 7 is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a working device in a construction machine such as a hydraulic excavator used for various construction works and civil works.

[0002]

2. Description of the Related Art Generally, in this type of construction machine, a base end portion of a support arm to which a blade is attached to a tip end portion is attached to a body frame of a traveling body so as to be vertically swingable,
Then, there is a configuration in which one end of the hydraulic cylinder whose one end is connected to the machine frame side and the other end is connected to the support arm is configured to perform vertical swing of the support arm by the expansion and contraction operation.

[0003]

By the way, conventionally, since the supporting arm and the blade are integrally attached by welding or the like, the blade of the blade may be exchanged or another working attachment may be attached in place of the blade. In case,
Since the blade has been removed integrally with the support arm, heavy labor may be allowed, or the connection between the support arm and the hydraulic cylinder must be disconnected, which is a troublesome and complicated problem. There was a problem to do.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and a supporting arm for a blade is vertically mounted on a traveling machine body. In the construction machine in which the blade is swingably mounted, the support arm is configured such that the blade can be detachably mounted so that another working attachment can be mounted in place of the blade. This allows
By attaching / detaching the blade to / from the support arm, the work of exchanging the blade of the blade and attaching other work attachments can be easily performed, thus improving workability. In this case, when the blade is detachably attached to the support arm, the blade is provided with a plurality of lock pins facing in the left-right direction, while the support arm is hooked so as to be detachably engaged with each of the lock pins. By providing a plurality of blades, the blade can be easily attached and detached. Further, by connecting the hook to the telescopic cylinder so as to engage and disengage the lock pin by the telescopic operation of the telescopic cylinder, automatic engaging and disengaging work can be performed. Further, by providing the supporting arm with a lifting portion for lifting the lock pin mounting portion on the blade side in a state where the supporting plate is disengaged from the supporting arm and the bottom plate portion is grounded to the ground, the bottom plate portion is provided. Deformation of the blade between the stable posture grounded and the mounting posture on the support arm,
This can be performed by utilizing the vertical swing of the support arm, which further improves workability.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a hydraulic excavator, and the hydraulic excavator 1 includes a crawler-type lower traveling body 2, an upper revolving body 3 which is rotatably supported above the lower traveling body 2, and an upper revolving body 3. It is the same as that of the related art that it is composed of the respective parts such as the front attachment 4 and the like provided in the front part of the above, but the working unit 5 is further mounted on the lower traveling body 2.

The working device 5 is composed of members such as a support arm 6, a blade 7 and a hydraulic cylinder 8. The base end (rear end) of the support arm 6 is a lower traveling body. It is supported by a support bracket 9 fixedly mounted on a second frame (not shown) via a support pin 10 so as to be vertically swingable. Further, an attachment attachment portion 11 to which the blade 7 is detachably attached is integrally formed at the tip portion (front end portion) of the support arm 6. Further, a cylinder mounting seat 12 is formed on the upper side of the attachment mounting portion 11, and the tip end portion of the piston rod 8a of the hydraulic cylinder 8 is swingable on the cylinder mounting seat 12 via a pin shaft 8b. Is attached to. The base end of the hydraulic cylinder 8 is swingably attached to the support bracket 9 via a pin shaft 8c.

The attachment mounting portion 11 is in the shape of a square cylinder whose front side is open. The front plate 11b formed above the opening 11a has a first engaging / disengaging hook 1.
3 is swingably supported. Further, the second engagement / disengagement hook 14 is swingably supported on the lower surface plate 11c of the attachment mounting portion 11, and is attached to the rear side of the first engagement / disengagement hook 13 between the left and right side surface plates 11d. The fixed hook 15 is fixed.

On the other hand, on the rear plate portion 7a of the blade 7,
A mounting bracket 16 that fits into the opening 11a of the attachment mounting portion 11 is provided so as to project rearward, and the first and second engaging / disengaging hooks 13 and 14 and the fixing hook 15 are attached to the mounting bracket 16. The first, second, and third lock pins 17, which are oriented in the left-right direction to be locked,
18 and 19 are attached. And blade 7
Attach the mounting bracket 16 to the attachment mounting portion 1
1 and fix the third lock pin 19 to the fixed hook 15
The first and second engagement / disengagement hooks 13 and 14 are locked to the first and second lock pins 18 and 19, respectively, in a state of being pressed against and positioned to By fixing the second engagement / disengagement hooks 13 and 14,
It is configured such that it can be detachably attached to the attachment attachment portion 11 of the support arm 6. Incidentally, the first engaging / disengaging hook 13 is from the front side and the lower side with respect to the first lock pin 18, the second engaging / disengaging hook 14 is from the front side and the lower side with respect to the second lock pin 19, and the fixing hook 15 is the third. Lock pin 1
9 is set to be engaged with the support arm 6 from the upper side and the rear side, respectively, whereby the blade 7 is attached in a fixed state in which movement in the up-down and front-rear directions with respect to the support arm 6 is restricted. The blade 7 is moved in the left-right direction by contacting the left and right side plates 16a of the mounting bracket 16 with the left and right side plates 11d of the attachment mounting portion 11.

In the configuration as described above, the blade 7 is detachably attached to the support arm 6 as described above, and as a result, the blade 7 is replaced when the blade of the blade 7 is replaced. Since it is possible to remove only the support arm 6 integrally with the blade 7 and the connection with the hydraulic cylinder 8 must be removed, the workability is significantly improved. To do.

Further, in place of the blade 7, as shown in FIG. 5, an outrigger 21, a breaker 22, an angle tilt blade 23, or various work attachments such as a damper, a load cleaner, a brush (not shown), or the like, is provided. It is convenient because it can be easily mounted on the lower traveling body 2 through the mounting bracket.

The present invention is not limited to the above-described embodiment, but the engaging and disengaging hooks 13 and 14 are provided in the telescopic cylinder (hydraulic cylinder) 24 as in the second embodiment shown in FIG. By connecting and disconnecting the engaging and disengaging hooks 13 and 14 by the expanding and contracting operation of the expanding and contracting cylinder 24, the automatic engaging and disengaging work can be performed and the workability is improved.

Further, as in the third embodiment shown in FIGS. 7 to 11, as the blade 7 is transformed from the stable posture in which the bottom plate portion 7b is in contact with the supporting arm mounting posture, a lock pin and a hook are formed. Can be configured to be automatically locked. That is, in this, the first engaging / disengaging hook 13 and the fixed hook 15 among the hooks provided in the attachment mounting portion 11 of the support arm 6 are the same as those in the first embodiment, but in the first embodiment. An engagement / disengagement plate 25 is provided as a component corresponding to the second engagement / disengagement hook 14. This engagement plate 25
Are left and right side surfaces 25a having substantially triangular shape,
5a has a guide surface 25b for connecting the upper side to each other, and a hook-shaped stopper piece 25c protruding downward from the rear end portion of the lower side of the left and right side surfaces 25a and protruding further rearward from the protruding lower end portion. Further, a fixing pin hole 25d is formed in the upper part of the rear end portion of the left and right side surfaces 25a, and the front end portion of the left and right side surfaces 25a is attached to the left and right side surface plates 11d of the attachment mounting portion 11 via the pin shaft 25e. It is supported so that it can swing up and down.

On the other hand, the lower surface plate 11c of the attachment mounting portion 11 is provided with the recess 1 with which the engaging / disengaging plate 25 is engaged.
1e is formed, but left and right insertion holes 11f through which the left and right side surfaces 25a of the engagement and disengagement plate 25 are inserted and removed are formed in the recess 11e. Then, the engagement / disengagement plate 25 has the upper side of the stopper piece 25c abutting against the lower side surface of the lower surface plate 11c to prevent further upward movement, and the rear portions of the left and right side surfaces 25a project above the upper side surface of the lower surface plate 11c. The upward movement posture and the lower side surface of the guide surface 25b come into contact with the upper side surface of the concave portion 11e to prevent further downward movement, whereby the upper side surface of the guide surface 25b is placed on the lower surface plate 1.
The lower surface of the guide surface 25b and the concave portion 11 can be transformed into a downward movement posture that is substantially flush with the upper surface of the guide surface 1c.
e is always urged toward the upper moving posture side by the ammunition machine 26 interposed between the upper side surface and the upper side surface. On the other hand, on the left and right side plates 11d of the attachment mounting portion 11, upper and lower fixing pin insertion holes 11g, 1g are formed at positions corresponding to the fixing pin hole 25d positions of the engaging / disengaging plate 25 in the upward and downward positions.
1 h is drilled. And a fixing pin (not shown)
Is locked in the fixing pin hole 25d by inserting the locking pin into the fixing pin hole 25d through the fixing pin insertion hole 11g or 11h. Further, left and right guide rods 27 projecting forward are integrally provided at the front end portion of the lower surface plate 11c of the attachment mounting portion 11, but the guide rod 27 has a plate thickness on the rear end side. The thickness of the lower surface plate 11c is substantially the same as that of the lower surface plate 11c, and the lower surface plate 11c is formed in an inclined shape such that the thickness becomes thinner toward the front side.

[0014] In the third embodiment,
When attaching the blade 7 to the support arm 6, the engagement / disengagement plate 25 is not fixed, and the support arm 6
Is moved downward until the guide rod 27 comes into contact with the ground. On the other hand, the blade 7 is placed on the ground in a stable state in which the bottom plate portion 7b is grounded. At this time, the second lock pin 18 of the mounting bracket 16 is substantially contacted with or slightly mounted on the front end portion of the guide rod 27. State. In this state, when the support arm 6 is moved upward while advancing the aircraft, the second lock pin 1
8 is first lifted in a state of being guided by the guide rod 27 and then by the guide surface 25b of the engaging / disengaging plate 25, and the mounting bracket 16 is gradually fitted into the attachment mounting portion 11. At this time, the engagement / disengagement plate 25 is
As shown in FIG. 11, the second lock pin 18 has the guide surface 25.
In the state of being mounted on b, the second lock pin 18 presses the engagement / disengagement plate 25, so that the engagement / disengagement plate 25 is in the above-described downward movement posture against the ammunition 26. With the pin 18 passing through the guide surface 25b,
The engagement / disengagement plate 25 is transformed into the above-described upward movement posture by receiving the urging force of the bullet 26, and the engagement / disengagement plate 25 in the upward movement posture is obtained.
The rear sides of the left and right side surfaces 25a are set so as to be locked to the second lock pin 18 and restrict the movement of the second lock pin 18 to the front side. Further, in this way, the disengagement plate 2
The first lock pin 17 and the third lock pin 19 are positioned so that when the fifth locks on the second lock pin 18, the first lock pin 17 locks on the first engagement / disengagement hook 13, and the third lock pin 19 locks on the fixed hook 15. Then, in this state, the engagement / disengagement plate 25 is fixed to the upward movement posture using the fixing pin, and the first engagement / disengagement hook 13 is fixed by the bolt so that the blade 7 can be integrally attached to the support arm 6. It has become.

On the other hand, when removing the blade 7 from the support arm 6, with the front end of the blade 7 grounded,
The bolts of the first engagement / disengagement hook 13 are removed, and after the fixing pin of the engagement / disengagement plate 25 is removed, the stopper piece 25c is moved downward to transform the engagement / disengagement plate 25 into the downward movement posture, and then to the downward movement posture. Fixing using the fixing pin, engagement plate 25
And the second lock pin 18 are disengaged. In this state, by lowering the support arm 6 while moving the machine body backward, the attachment mounting portion 11 is gradually withdrawn from the mounting bracket 16 in a state opposite to the above mounting state.
As a result, the blade 7 can be removed from the support arm 6 in a stable state in which the bottom plate portion 7b of the blade 7 is grounded.

As described above, in the third embodiment, the second lock pin 18 is disengaged as the blade 7 is changed from the stable posture in which the bottom plate portion 7b is grounded to the posture in which the support arm 6 is attached. The locking to the plate 25 can be automatically performed, and the workability is improved. Moreover, this one
When changing the blade 7 from the stable posture in which the bottom plate portion 7b is grounded to the supporting arm attachment posture, the second lock pin 18 on the blade 7 side is attached to the attachment arm by moving the supporting arm 6 upward while advancing the aircraft. The blade 7 is transformed into the mounting posture by being guided and lifted by the guide rod 27 protruding forward from the mounting portion 11, and the blade 7 can be smoothly transformed into the mounting posture. You can By the way, the bottom plate 7
When attaching the blade 7 in the state of b being grounded to the support arm 6, it is necessary to lift the rear side of the bottom surface portion 7b to a mounting posture in which the rear side is lifted up. For that purpose, as shown in the third embodiment, The guide rod 27 may be configured to project forward long, but the present invention is not limited to this, and the front end portion of the attachment attachment lower surface plate 11c is not limited to the guide rod 27 of the first embodiment, for example. The blade 7 can be automatically transformed into the mounting posture by moving the support arm 6 upward while advancing the vehicle body while forcibly entering the lower side of the mounting bracket 16. In this case, The front side portion of the lower surface plate 11c is the lifting portion of the present invention. In addition, in the second and third embodiments, the same components (the same components) as those in the first embodiment are designated by the same reference numerals.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic excavator.

FIG. 2 is a side view of the work device.

FIG. 3 is a partially cutaway enlarged view of an attachment mounting portion.

FIG. 4 is a perspective view of a mounting bracket.

5A, 5B, and 5C are schematic views of a hydraulic excavator to which another work attachment is attached.

FIG. 6 is a diagram showing an attachment mounting portion according to a second embodiment.

FIG. 7 is a perspective view of an engagement / disengagement plate according to a third embodiment.

FIG. 8 is a perspective view of a bottom plate of an attachment mounting portion according to a third embodiment.

FIG. 9 is a perspective view showing a state where the engagement plate is attached to the lower surface plate in the third embodiment.

FIG. 10 is a diagram showing the start time of a blade mounting operation according to the third embodiment.

FIG. 11 is an explanatory diagram showing a transformation process of the engagement / disengagement plate during a blade mounting operation in the third embodiment.

[Explanation of symbols]

 6 Support Arm 7 Blade 7b Bottom Plate 13 First Engagement / Disengagement Hook 14 Second Engagement / Disengagement Hook 15 Fixed Hook 17 First Lock Pin 18 Second Lock Pin 19 Third Lock Pin 24 Telescopic Cylinder 25 Fixed Hook 27 Guide Rod

Claims (4)

[Claims] 1. A construction machine in which a support arm for a blade is attached to a traveling machine body so as to be vertically swingable, and the support arm is detachable so that other work attachments can be attached instead of the blade. A working device in a construction machine configured to be freely attached. 2. The blade according to claim 1, wherein the blade is detachably attached to the support arm, the blade is provided with a plurality of lock pins facing in the left-right direction, while the support arm is engaged with each of the lock pins. A work device in a construction machine provided with a plurality of hooks that are detachably locked. 3. The working device in a construction machine according to claim 2, wherein the hook is connected to the telescopic cylinder so as to be disengaged from the lock pin by the telescopic operation of the telescopic cylinder. 4. The support arm according to claim 2, wherein the support arm is mounted on the support arm by lifting the blade-side lock pin mounting portion in a state where the support plate is disengaged from the support arm and the bottom plate is in contact with the ground. Work equipment in construction machinery provided with a lifting part.