JP2580616Y2 - Hydraulic excavator front attachment changer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front attachment changing device for a hydraulic shovel.

[0002]

2. Description of the Related Art There is an attachment exchanging device for easily attaching and detaching various attachments such as various buckets, hydraulic breakers, crushers and the like to a hydraulic excavator front part.
Conventionally, when attaching and detaching various attachments to a hydraulic excavator, it is necessary to accurately match the attachment part of the attachment with the attachment part of the hydraulic excavator (the tip of the arm and the link rod) and pull out and insert heavy pins. Required skill and great effort.

As shown in FIG. 4, an attachment 101 such as a hydraulic breaker has two attachment pins A and B attached to the upper corners thereof and fixed to the tip of an arm of a hydraulic shovel. It is detachably attached to the attachment replacement device. FIGS. 5 and 6 show examples of the attachment replacement device.
In FIG. 5, the bracket 20 of the attachment changing device is shown.
1 is provided with excavator mounting pins 203 and 204, hooks a fixed hook 205 of a bracket 201 on an attachment pin A mounted on an attachment, and attaches a movable hook 206 pivotally attached to the excavator mounting pin 203 with a screw or a hydraulic cylinder. At 207, it was extended, engaged with the attachment pin B, fixed and mounted.

[0006] In FIG. 6, a bracket 301 of the attachment exchanging device includes a hydraulic excavator mounting pin 303.
304 is provided, the fixed hook 305 of the bracket 301 is hooked on the attachment pin A attached to the attachment, and the movable hook 306 sliding on the guide plate 308 provided on the bracket 301 is extended by the hydraulic cylinder 307 for attachment. It was fitted and fixed to the pin B.

[0005]

SUMMARY OF THE INVENTION In a front attachment replacement device for a hydraulic shovel, when play occurs between an attachment pin due to friction between a fixed hook and a movable hook, and a screw type of a rotating mechanism of the movable hook. In the case of (1), there was anxiety in fixing the attachment pin due to loosening of the hydraulic actuator and oil leakage.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made in consideration of the above circumstances, and is intended to facilitate mounting of various attachments such as buckets, hydraulic breakers, and crushers on a front portion of a hydraulic excavator. An attachment exchanging device for a hydraulic shovel in which an attachment with two pins interposed therebetween is detachably attached with the attachment interposed between the attachment and the tip of the arm, and slides on a guide plate of a bracket fixed to the tip of the arm. A hydraulic cylinder connected to a movable hook that moves is provided.A lever is pivotally attached to the rod end of the hydraulic cylinder, and a fixed hook is protruded from the bracket.When the rod of the hydraulic cylinder is extended, one pin is connected to the fixed hook. The center of the lever is pivotally attached to the bracket so that it can be held by the lever, and the movable hook is By the hydraulic excavator of the front attachment replacement apparatus that is engaged with the other pin attaching the attachment to the distal end of the arm.

[0007]

The present invention provides a hydraulic cylinder coupled to a movable hook that slides on a guide plate of a bracket fixed to the end of an arm, and a lever is pivotally attached to the rod end of the hydraulic cylinder, and a fixed hook is attached to the bracket. When the rod of the hydraulic cylinder is extended, the center of the lever is pivotally attached to the bracket so that one pin can be held by the fixed hook and the lever, and the movable hook is moved to move the other pin. The attachment is attached to the tip of the arm by engaging with the arm, so that attachment and detachment of the attachment can be performed easily and accurately.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on a specific embodiment shown in the accompanying drawings. First, the overall outline will be described with reference to FIG. 1. The excavator mounting pin 4 (the end of the arm 2) and the excavator mounting pin 5 (the link rod 3) is provided, and an attachment exchange device 6 is provided.
In addition, using two attachment pins A and B attached to the upper part of the attachment 7,
The attachment 7 is provided detachably.

FIG. 2 shows a lever 12 which is attached to and detached from an attachment pin A and an attachment pin B which are mounted on the bracket 11 of the attachment exchange device 6 above the attachment 7, a movable hook 14, and a hydraulic cylinder for driving the movable hook 14. 10 are provided. Above the bracket 11, there are provided a hydraulic shovel mounting pin 4 (at the end of the arm 2) and a hydraulic shovel mounting pin 5 (at the link rod 3 side) for mounting the attachment changing device 6 to the front portion of the arm 2. is there.

The movable hook 14 is fitted in a guide hole 15 formed in a guide plate 13 formed below the bracket 11, and is slidably provided along the guide hole 15 by a hydraulic cylinder 10.
A lever 12 that engages with the attachment pin A is pivotally attached to the tip of a piston rod 16 of the hydraulic cylinder 10. When the piston rod 16 of the hydraulic cylinder 10 is extended,
As shown in FIG. 2, the center of the lever 12 is pivotally attached to the bracket 11 so that the lever 12 can be held between the bracket 11 and a fixed hook 17 extending below the bracket 11.

The piston rod 16 of the hydraulic cylinder 10
A stopper 18 is erected on the side of the bracket 11 so that the lever 12 comes into contact with the end of the reduced length and stops. In order that this attachment 7 can be safely attached to the attachment exchange device 6, a safety hole 19 formed in the bracket 11 shown in FIG. 3 and a support hole 20 formed in the upper end of the lever 12 are matched with each other. Insert.

The hydraulic cylinder 10 has a cap 23
By incorporating the pilot check valve 21 on the side, it is possible to prevent the mounting from being loosened due to oil leakage due to damage to the piping. Reference numeral 22 denotes a hydraulic pipe. FIG. 3 shows a state in which the piston rod 16 of the hydraulic cylinder 10 is contracted. With the contraction of the piston rod 16, the lever 12 rotates in a direction to release the attachment pin A, and the hydraulic cylinder
As the piston rod 16 of 10 contracts, the hydraulic cylinder 10 moves forward (moves rightward in the figure), the movable hook 14 also moves forward, the attachment pin B is released, and the attachment exchange device 6 sends the attachment 7 Is released.

In the present invention, the movable hook is
By simultaneously operating the lever 14 and the lever 12, the attachment pin B is held by the movable hook 14, and the attachment pin A is securely held by the lever 12 and the fixed hook 17. Further, the hydraulic cylinder 10 is provided with a pilot check valve 21, so that loose mounting due to oil leakage can be prevented.

[0014]

As described above, the present invention is an attachment exchanging device for a hydraulic excavator in which an attachment of a hydraulic excavator is interposed between an attachment and an end of an arm, and an attachment having two pins mounted thereon is detachably attached. A hydraulic cylinder coupled to a movable hook that slides on a guide plate of a bracket fixed to the tip of the arm is provided.A lever is pivotally attached to the rod end of the hydraulic cylinder, and a fixed hook is projected from the bracket, When the rod of the hydraulic cylinder is extended, the center of the lever is pivotally attached to the bracket so that one pin can be held by the fixed hook and the lever, and the movable hook is moved to engage the other pin. Since it is a front attachment replacement device for hydraulic excavators in which the attachment is attached to the tip of the arm, The lever for fixing the pin A for attachment and the movable hook for holding the pin B for attachment are simultaneously operated with one hydraulic cylinder, and both hooks are pinched by the pin A for attachment and the pin B for attachment by the cylinder force. Can be attached to and detached from attachments.

Further, in the present invention, by installing the pilot check valve in the hydraulic cylinder, it is possible to prevent the mounting from being loosened due to oil leakage when the piping is damaged. Further, in the present invention, the safety can be ensured by inserting the safety pin into the hole of the lever and the bracket provided so as to be aligned with the pin for attachment being held by the lever.

In addition, in the present invention, even if oil leakage occurs from the hydraulic cylinder for some reason and the stroke amount is reduced, the moving amount (play) of the movable hook / lever and the attached member pin can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing the general outline of the present invention.

FIG. 2 is a front view of a state in which a hydraulic cylinder of a main part of the present invention is operated and an attachment is mounted by an attachment exchange device.

FIG. 3 is a front view showing a state in which a hydraulic cylinder is contracted and an attachment is removed from an attachment changing device.

FIG. 4 is a front view of a conventional attachment.

FIG. 5 is a front view showing a state in which the attachment of the conventional attachment exchange device is attached (the attachment 7 is not shown).

FIG. 6 is a front view of another example of a state in which the attachment is attached to the attachment exchange device (the attachment 7 is not shown).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hydraulic excavator 7 ... Attachment 2 ... Arm A / B ... Attachment pin 3 ... Guide plate 15 ... Guide hole 14 ... Movable hook 16 ... Piston rod 12 ... Lever 11 ... Bracket 17 ... Fixed hook 18 ... Stopper

Claims (1)

(57) [Scope of request for utility model registration] 1. An attachment exchanging device for a hydraulic excavator in which an attachment of a hydraulic excavator is interposed between an attachment and an end of an arm, and an attachment having two pins mounted thereon is removably attached to the excavator. When a hydraulic cylinder connected to a movable hook that slides on the guide plate of the bracket is provided, a lever is pivotally attached to the rod end of the hydraulic cylinder, and a fixed hook is protruded from the bracket to extend the rod of the hydraulic cylinder. The center of the lever is pivotally attached to the bracket so that one pin can be held by the fixed hook and the lever, and the movable hook is moved to engage with the other pin to attach the attachment to the tip of the arm. Hydraulic excavator front attachment replacement device.