JPH09310370A - Mounting/dismounting device for attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make mounting/dismounting simple while preventing coming-off by a method wherein a fixed hook and a movable hook to be engaged with attachment pins are provided at a mounting frame, and a turning link is connected at its one end to the movable hook while being connected at the other end to a slide mechanism. SOLUTION: A fixed hook 2 and a movable hook 3 to be engaged with attachment pins 21, 21 are provided at a mounting frame 1 provided at an arm of a power shovel, and one end of a turning link 4 is connected to the movable hook 3 and the other end of the turning link 4 is connected to a slide block mechanism 5 that moves by operation of a feed screw 6. The movable hook 3 turns, being pushed by the turning link 4 connected to the slide block 5, and the fixed hook 2 and the movable hook 3 are engaged with the attachment pins 21, 21 and hold an attachment 20. The slide block 5 is arranged so that the connecting point of the turning link 4 and the slide block 5 can move almost perpendicularly against a line connecting both of the attachment pins 21, 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching and detaching an attachment such as a bucket or a crusher to an arm of a power shovel.

[0002]

2. Description of the Related Art When attaching or detaching an attachment such as a bucket or a crusher to the tip of the arm of a power shovel, insert the pin by aligning the pin hole of the arm tip with the pin hole of the attachment, or I was pulling out the pin. It takes time and effort to attach and detach such a pin, and it is particularly difficult for a large power shovel since the attachment and detachment attachment and the pin become large and heavy.

Therefore, attachment attachment / detachment devices have been used for facilitating attachment / detachment of attachments. As shown in FIG. 4, a conventional attachment attaching / detaching device has a mounting frame 1 mounted on the tip of an arm of a power shovel with a mounting pin, a fixing hook 2 fixed to the mounting frame 1, and a mounting frame 1 mounted on the mounting frame 1. It is composed of a movable hook 3 that is rotatably pivotally mounted, and a hydraulic cylinder 30 that is attached and detached between the fixed hook 2 and the movable hook 3.

This attachment attachment / detachment device is attached to the tip portion of the arm of the power shovel by inserting the attachment pin so that the attachment pin hole 11 of the attachment frame 1 is aligned with the pin hole of the arm tip portion. When mounting the attachment 20, the fixed hook 2 is engaged with one of the attachment pins 21 fixed to the base end of the attachment 20, and then the hydraulic cylinder 30 is extended to rotate the movable hook 3. As a result, the rotary hook 3 is engaged and fixed to the other attachment pin 21.

When detaching the attachment 20,
Shorten the hydraulic cylinder 30 to rotate the movable hook 3,
It may be removed from the attachment pin 21 that has been engaged.

[0006]

However, in such an attachment attachment / detachment device, the direction in which the hydraulic cylinder 30 is shortened and the direction in which the rotary hook 3 is disengaged are substantially the same, and the direction in which the hydraulic cylinder 30 is shortened. Work such as applying force to the attachment hook 20
When the work such as pushing from the side toward the movable hook 3 side (the left direction in the figure) is performed, the hydraulic cylinder 30 is shortened and the attachment pin 21 is disengaged from the fixed hook 2 as shown in FIG. The attachment 20 may fall off.

The present invention is intended to solve such a problem in the attachment attaching / detaching device, and the attachment can be easily attached / detached to / from the arm of the power shovel, and the attachment is not likely to fall off during work. An object is to provide a detachable device.

[0008]

In an attachment attaching / detaching device for attaching / detaching an attachment to / from an arm of a power shovel according to the present invention, a fixed hook and a movable hook that engage with an attachment pin are provided on a mounting frame, and the movable hook is attached to the movable hook. The above problem is solved by connecting one end of the rotating link and connecting the other end of the rotating link to the slide mechanism.

The movable hook is rotated by being pressed by a rotation link connected to the slide mechanism, and the fixed hook and the movable hook engage with the attachment pin to hold the attachment. Even if the attachment hook is pushed from the fixed hook side toward the movable hook side, the force acting on the rotation link at this time is not the same as the moving direction of the connecting portion between the rotation link and the slide mechanism in the slide mechanism. Since they are different and work in the direction of increasing the frictional resistance, there is no risk that the engagement between the fixed hook and the movable hook and the attachment pin will be loosened and the attachment will fall out.

The slide mechanism is arranged so that the connecting portion between the rotation link and the slide mechanism is moved in a direction substantially perpendicular to the line connecting the attachment pins, so that the engagement between the fixed hook, the movable hook and the attachment pin is increased. Can be made more difficult to loosen.

The rotating link is arranged so that when the fixed hook and the movable hook are engaged with the attachment pin, the rotating link is arranged substantially perpendicular to the moving direction of the connecting portion between the rotating link and the slide mechanism. The engagement between the movable hook and the attachment pin can be made more difficult to loosen.

The slide mechanism is composed of a slide block connected to the rotation link and a feed screw for moving the slide block to prevent the hydraulic cylinder, the hydraulic source, the hydraulic pipe, and the hydraulic cylinder from being shortened. No check valves are required, and equipment costs can be reduced. Also, since the movable hook can be fixed at any position, it is necessary to fix the movable hook at an appropriate position that does not apply excessive force to the attachment pin or the attachment attachment / detachment device and can reliably prevent the attachment from falling off. Is possible.

By providing the slide mechanism with a lock nut for locking the feed screw, the position of the slide block can be more reliably fixed, so that the attachment can be held more reliably.

[0014]

1 is a front view of an attachment attaching / detaching device according to an embodiment of the present invention, and FIG. 2 is an explanatory view of an attachment mounting state of the attachment attaching / detaching device,
FIG. 3 is a front view showing a state in which a crusher as an attachment is attached to a power shovel by an attachment attaching / detaching device.

This attachment attaching / detaching device comprises a mounting frame 1, a fixed hook 2, a movable hook 3, a rotating link 4, a slide mechanism including a slide block 5 and a feed screw 6.

The fixed hook 2 is fixed to the mounting frame 1, and the movable hook 3 is attached to the mounting frame 1 by hook pins 7.
It is pivotally mounted at. The fixed hook 2 and the movable hook 3 are provided with recesses 2C and 3C that engage with the attachment pin 21 fixed to the base end of the attachment 20. One end of the rotating link 4 is connected to the movable hook 3 by a link pin 9, and the other end of the rotating link 4 is connected to the slide block 5 by a link pin 8.

The base of the slide block 5 is screwed onto a feed screw 6 provided along the fixed hook 2, and the slide block 5 is moved up and down along the feed screw 6 by turning the feed screw 6. Then, the movable hook 3 is rotated right and left around the hook pin 7 through the rotation link 4, and is fixed at a predetermined position by the lock nut 10.

Here, the feed screw 6 is arranged so as to move the connecting portion of the slide block 5 and the rotating link 4 in a direction substantially perpendicular to a line connecting the left and right attachment pins 21.

When the fixed hook 2 and the movable hook 3 are engaged with the attachment pin 21, the rotating link 4 is perpendicular to the moving direction of the connecting portion between the slide block 5 and the rotating link 4. They are arranged so that they are close to each other.

The mounting frame 1 is provided with a mounting pin hole 11, and this attachment attaching / detaching device aligns the mounting pin hole 11 of the mounting frame 1 with the pin hole of the arm 41 tip of the power shovel 40. Is attached to the tip of the arm 41.

When mounting the attachment 20, as shown in FIG. 1, after engaging the concave portion 2C of the fixed hook 2 with one of the attachment pins 21, the feed screw 6 is turned to lower the slide block 5 downward. 2 and by rotating the movable hook 3 to the right, as shown in FIG.
The other attachment pin 21 is provided with a recess 3 of the turning hook 3.
Engage and fix C.

When detaching the attachment 20,
When the feed screw 6 is mounted, the slide block 5 is rotated in the opposite direction to move the slide block 5 upward, and the movable hook 3 is rotated to the left, thereby engaging the attachment pin 21.
Remove it from

As described above, the movable hook 3 is rotated by being pressed by the rotation link 4 connected to the slide block 5,
Attachment hook 21 with fixed hook 2 and movable hook 3
Since the attachment 20 is held by being engaged with, even if a work such as pushing the attachment 20 from the fixed hook 2 side toward the movable hook 3 side is performed, the force acting on the rotation link 4 at this time is the slide mechanism. Since it is different from the moving direction of the connecting portion between the rotating link 4 and the slide block 5 in the above, and acts in the direction of increasing the frictional resistance, the engagement between the fixed hook 2, the movable hook 3 and the attachment pin 21 is made. There is no risk that the attachment 20 will come loose and fall off.

The feed screw 6 is arranged so that the connecting portion between the slide block 5 and the rotating link 4 moves in a direction substantially perpendicular to the line connecting the attachment pins 21, so that the movable hook 3 is engaged. Since the detaching direction and the moving direction of the slide block 5 are substantially orthogonal to each other, the engagement between the fixed hook 2, the movable hook 3 and the attachment pin 21 is extremely difficult to loosen.

When the fixed hook 2 and the movable hook 3 are engaged with the attachment pin 21, the rotating link 4 is perpendicular to the moving direction of the connecting portion between the slide block 5 and the rotating link 4. Since they are arranged close to each other, the engagement between the fixed hook 2 and the movable hook 3 and the attachment pin 21 is more difficult to loosen.

Since the slide mechanism is composed of the slide block 5 connected to the rotation link 4 and the feed screw 6 for moving the slide block 5, the hydraulic cylinder, the hydraulic source, the hydraulic pipe, and the hydraulic cylinder are shortened. A check valve or the like for preventing the above is not required, and the cost can be reduced. Further, since the movable hook 3 can be fixed at an arbitrary position, the attachment pin 21, the fixed hook 2 of the attachment attaching / detaching device, and the movable hook 3 are not subjected to an unreasonable force, and the attachment 20 is surely prevented from falling off. It is possible to fix the movable hook 3 at an appropriate position.

Since the slide mechanism is provided with the lock nut 10 for locking the feed screw 6, the position of the slide block 5 can be more reliably fixed.

[0028]

As described above, according to the attachment attaching / detaching device of the present invention, the attachment can be easily attached / detached to / from the arm of the power shovel, and there is no fear that the attachment will fall off during work.

The slide mechanism is arranged so that the connecting portion of the rotary link moves in a direction substantially perpendicular to the line connecting the attachment pins, so that the engagement between the fixed hook, the movable hook and the attachment pin is further relaxed. Can be hardened.

The slide mechanism is composed of a slide block connected to the rotation link and a feed screw for moving the slide block, so that the hydraulic cylinder, the hydraulic source, the hydraulic pipe, and the hydraulic cylinder are prevented from being shortened. No check valves are required, and equipment costs can be reduced. Also, since the movable hook can be fixed at any position, it is necessary to fix the movable hook at an appropriate position that does not apply excessive force to the attachment pin or the attachment attachment / detachment device and can reliably prevent the attachment from falling off. Is possible.

By providing the slide mechanism with a lock nut for locking the feed screw, the position of the slide block can be more reliably fixed, so that the attachment can be held more reliably.

[Brief description of drawings]

FIG. 1 is a front view of an attachment attaching / detaching device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an attachment mounting state of the attachment attaching / detaching device.

FIG. 3 is a front view showing a state in which a crusher as an attachment is attached to a power shovel by an attachment attaching / detaching device.

FIG. 4 is a front view of a conventional attachment attaching / detaching device.

FIG. 5 is an explanatory view showing a state in which the attachment of the conventional attachment attaching / detaching device is detached.

[Explanation of symbols]

 1 Mounting Frame 2 Fixed Hook 3 Movable Hook 4 Rotating Link 5 Slide Block 6 Feed Screw 7 Hook Pin 8 Link Pin 9 Link Pin 10 Lock Nut 11 Mounting Pin Hole 20 Attachment 21 Attachment Pin 40 Power Shovel 41 Arm 42 Mounting Pin

Claims (5)

[Claims] 1. An attachment attachment / detachment device for attaching / detaching an attachment to / from an arm of a power shovel, comprising:
An attachment attachment / detachment device in which a fixed hook and a movable hook that engage with an attachment pin are provided in a mounting frame, one end of a rotation link is connected to the movable hook, and the other end of the rotation link is connected to a slide mechanism. 2. The attachment attaching / detaching device according to claim 1, wherein the slide mechanism is arranged so as to move a connecting portion of the rotation link and the slide mechanism in a direction substantially perpendicular to a line connecting the attachment pins. 3. The rotating link is arranged so as to be substantially perpendicular to the moving direction of the connecting portion between the rotating link and the slide mechanism when the fixed hook and the movable hook are engaged with the attachment pin. Alternatively, the attachment attaching / detaching device according to claim 2. 4. The attachment attachment / detachment device according to claim 1, 2 or 3, wherein the slide mechanism includes a slide block connected to the rotation link and a feed screw for moving the slide block. 5. The attachment attaching / detaching device according to claim 4, wherein the slide mechanism includes a lock nut that locks the feed screw.