JP2539837Y2 - Bucket removal device - Google Patents

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 a bucket for a hydraulic shovel.

[0002]

2. Description of the Related Art FIG. 5 is a side view of a hydraulic shovel.
In the drawing, reference numeral 1 denotes a work attachment mounted on a front part of a hydraulic shovel, and 2 denotes a work attachment 1.
, 3 is an arm, 4 is a bucket, 5 is a bucket link, 6 is an idler link, 7 is a bracket erected on the back of the bucket 4, and 8 and 9 are connecting pins. FIG. 6 is a sectional view taken along line AA of FIG. In the drawing, 10 is an arm tip boss of the arm 3, 11 is a bucket link tip boss of the bucket link 5, 12 is an arm tip mounting pin hole drilled in the bracket 7, and 13 is a bucket link tip mounting pin. The holes 14 and 15 are locking portions when the pins 8 and 9 are pivoted.

As shown in FIGS. 5 and 6, in a conventional bucket attaching / detaching apparatus, a bracket 7 is erected on the back of a bucket 4, and a pin hole 12 for attaching an arm tip and a bucket link tip are attached to the bracket 7. The tool pin holes 13 are drilled in parallel with each other so that the tip of the arm 3 and the tip of the bucket link 5 of the work attachment 1 and the bracket 7 of the bucket 4 are detached via pins 8 and 9.

[0004]

[Problems to be Solved by the Invention] In a hydraulic excavator, a bucket is frequently replaced in accordance with the type of work, the contents of work, or the state of work. In the prior art shown in FIGS. 5 and 6, since the pins are pivotally attached to the tip of the arm and the bucket link and the bracket of the bucket, respectively.
A driver or an operator pulls out the pin and replaces the bucket. Therefore, the replacement work of the bucket requires a great deal of labor and time, and the work efficiency is reduced. The purpose of the present invention is to solve the above problems.

[0005]

According to the present invention, a piston pin is provided for each of a boss at an arm end and a boss at a bucket link end so as to be separated left and right inside the boss and movable in the axial direction of the boss. A spring is interposed between the left and right piston pins to urge the piston pins outward, and the switching valve is operated to draw the left and right piston pins inward against the spring force of the spring. The diameter of the piston pin is set to be the same as the diameter of the pin hole drilled in the bracket of the bucket. The bucket is set to the same size as the distance between the hole centers of the pin holes, and can contact the boss portions fixed to the left and right side surfaces of the frame body on the opposite inner surface side of the bracket of the bucket. A positioning guide plate is provided so that the piston pins of the arm tip boss and the bucket link tip boss are respectively drawn inward from the left and right outer surfaces of the frame body, and the guide surface of the positioning guide plate is bossed on the bucket bracket. When abutting on the outer peripheral surface, the axial centers of the piston pins of the both bosses are aligned with the axial centers of the pin holes of the bracket of the bucket.

[0006]

FIG. 1 is a sectional view of a bucket attachment / detachment device according to the present invention and a hydraulic circuit for operating the bucket attachment / detachment device. In the figure, the same reference numerals are given to components using the same components as the conventional technology. Reference numeral 16 denotes a boss for the pin hole 12 for attaching the tip of the arm fixed to the inner surface of the bracket 4 of the bucket 4 opposite to the bracket 7. Reference numeral 17 denotes a boss for the pin hole 13 for attaching the tip of the bucket link. The tip boss, 19 is a bucket link tip boss, and 20 is an arm tip boss 18 and a bucket link tip boss 19.
Piston pins inserted at both left and right ends of the
21 is a bush, 22 is a sealing member, 23 is an O-ring,
Reference numeral 24 denotes a seal member fitted to the outer periphery of the base of the piston pin 20, 25 denotes a spring chamber inside the bosses 18 and 19, 26 denotes a spring, 27 denotes an oil chamber for the piston pin, and 28 denotes a stopper of the piston pin 20. Portions 29L and 29R are hydraulic ports that are drilled into the arm tip boss 18 and communicate with the left and right piston pin oil chambers 27. A port for hydraulic pressure leading to the chamber 27, 31 is an air passage for releasing air in the spring chamber 25 of the bosses 18 and 19 to the outside, 32 is a frame, and 33L and 33R are frames 3
Reference numeral 2 denotes left and right plates, reference numeral 34 denotes a center connection plate, reference numeral 35 denotes a switching valve, reference numeral 36 denotes a hydraulic source provided in a hydraulic shovel, and reference numeral 37 denotes an oil tank. Since the bucket 4 is used after being inverted and replaced for the excavating operation and the loading operation, the inner diameters of the pin hole 12 for attaching the tip of the arm and the pin hole 13 for attaching the tip of the bucket link are set to the same size φd. Therefore, the diameter of the piston pin 20 is the same as the diameter φd (to be exact, the piston pin 20 must be inserted into each of the two pit holes 12, 13. It is set to small diameter).

FIG. 2 is a plan view of the bucket attaching / detaching device of the present invention. In the drawing, reference numerals 38L and 38R denote positioning guide plates fixed to the outer surfaces of the left and right plates 33L and 33R of the frame 32, respectively. FIG. 3 is a side view of the bucket attaching / detaching device of the present invention as viewed from B of FIG. In the figure, the imaginary line A indicates a portion of the bucket 4 near the bracket. FIG. 4 is a cross-sectional view showing a state in which the piston pin 20 in the state in FIG. 1 is fitted into the bracket 7 of the bucket 4.

Next, the structure of the bucket attaching / detaching apparatus of the present invention will be described with reference to FIGS. In the present invention, a piston pin 20 is provided for each of the arm tip boss 18 and the bucket link tip boss 19 inside the bosses 18 and 19 so as to be able to move in the axial direction of the boss.
In addition, a spring 26 is interposed between the left and right piston pins (20) to urge the piston pins 20 outward, and the switching valve 35 is operated so that the left and right piston pins 20 are reduced by the spring force of the spring 26. The piston pin 20 has a diameter φ
d is set to be the same as the diameter (φd) of the pin holes 12 and 13 formed in the bracket 7 of the bucket 4, and the bosses 18 and 19 are connected by a frame 32 to connect the bosses 18 and 19.
Is set to the same size (dimension P shown in FIG. 1) as the distance between the hole centers of the pin holes 12 and 13 of the bucket 4. Positioning guide plates 38L and 36R are provided on the left and right side surfaces of the frame 32 so that the positioning guide plates 38L and 36R can be brought into contact with the upper outer peripheral surfaces of the bosses 16 and 17 fixed to the inner surfaces of the brackets 4 of the bucket 4 opposite to each other. Provided. And both bosses 18
And 19, respectively, with the piston pins 20 retracted inward from the left and right outer surfaces of the frame 32, and the guide surfaces 39 of the positioning guide plates 38L and 38R to contact the outer peripheral surfaces of the bosses 18 and 19, respectively. At this time, the axes of the piston pins 20 of the bosses 18 and 19 were aligned with the centers of the pin holes 12 and 13 of the bracket 7 of the bucket 4.

Next, the operation of the bucket attaching / detaching device of the present invention will be described. First, when attaching the detached bucket 4 to the tip of the work attachment, the switching valve 35 is operated to the opening oil passage position b. Since the pressure oil from the hydraulic pressure source 36 is supplied to the piston chambers 27 of both the bosses 18 and 19 via the switching position of the switching valve 35, the piston pin 20 is pulled inward against the spring force of the spring 26. Have been in a state.
As described above, the distal end of the piston pin 20 is retracted inward from the left and right outer surfaces of the frame 32, so that the driver operates the work attachment of the hydraulic shovel to move the bucket 4
The outer surface of the frame 32 is inserted into the inner surfaces of the opposing bosses 16 and 17 of the bracket 7. At the same time, a positioning guide plate 38L fixed to the left and right of the frame 32.
, 38R abut against upper outer peripheral surfaces of the bosses 16 and 17 of the bucket 4 bracket 7. When operated in this state, the axis of the piston pin 20 of both bosses 18 and 19 and the center of both pin holes 12 and 13 of the bracket 7 of the bucket 4 coincide with each other.
5 is switched from the B position to the tank communication oil passage position C. Since the pressure oil from the hydraulic pressure source 36 does not act on the piston pin 20, the spring 26 is extended by the spring force as shown in FIG. 4, and the piston pin 20 is projected outward. Since the protruding tip side of the piston pin 20 is inserted into the pin holes 12 and 13 of the bucket 4, the bucket 4 can be attached to the tip of the work attachment. The operation for removing the attached bucket 4 may be performed in a manner reverse to that of the above-mentioned case.

[0010]

As described above, in the present invention, the left and right bosses of the arm end portion and the bucket link end portion boss can be retracted and projected in the axial direction of the bosses by operating the switching valve. Piston pin was provided.
Further, a positioning guide plate is provided so as to be able to abut against a boss portion fixedly provided on the inner surface of the bucket bracket opposite to the inner surface. Accordingly, when the bucket is mounted on the tip of the work attachment, the piston pins of the arm tip boss and the bucket link tip boss are respectively retracted inside the left and right outer surfaces of the frame, and the guide surface of the positioning guide plate is bucketed. By abutting the outer peripheral surfaces of the boss portions of the brackets, the center axes of the piston pins of the both bosses and the centers of the two pin holes of the bracket of the bucket can be matched. The bucket attachment / detachment device of the present invention has a simple structure and can easily attach / detach the bucket in a short period of time, so that the driver and the operator can save labor and improve work efficiency.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross section of a bucket attaching / detaching device of the present invention and a hydraulic circuit for operating the bucket attaching / detaching device.

FIG. 2 is a plan view of the bucket attaching / detaching device of the present invention.

FIG. 3 is a side view as viewed from B in FIG. 2;

FIG. 4 is a cross-sectional view showing a state in which a piston pin in FIG. 1 is operated.

FIG. 5 is a side view of the hydraulic excavator.

FIG. 6 is a cross-sectional view showing the conventional technique as viewed from AA in FIG.

[Explanation of symbols]

 3 Arm 4 Bucket 5 Bucket Link 7 Bracket 10,18 Arm Tip Boss 11,19 Bucket Link Tip Boss 12,13 Pin Hole 16,17 Boss 20 Piston Pin 26 Spring 32 Frame 35 Switching Valve 38L, 38R Positioning Guide Plate 39 Guide surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A bracket is erected on the back of a bucket,
An arm tip mounting pin hole and a bucket link tip mounting pin hole are drilled in the bracket in parallel with each other, and the arm tip of the work attachment and the bucket link tip and the bracket of the bucket are pinned. A bucket attaching / detaching device which is adapted to be attached / detached, wherein a piston pin which is separated left and right inside the respective bosses for the arm tip boss and the bucket link tip boss and which can move in the axial direction of the boss is provided. A spring is interposed between the left and right piston pins to urge the piston pins outward, and the switching valve is operated to draw the left and right piston pins inward against the spring force of the spring. And set the diameter of the piston pin to the same size as the diameter of the pin hole drilled in the bracket of the bucket. The distance between the center axes of both bosses is set to the same size as the distance between the hole centers of the two pin holes of the bucket, and the left and right sides of the frame body are A positioning guide plate is provided so as to be able to abut against the boss portion fixed to the inner surface side, and the piston pins of the arm tip boss and the bucket link tip boss are respectively located inside the left and right outer surfaces of the frame body. When the guide surface of the positioning guide plate is brought into contact with the outer peripheral surface of the boss portion of the bucket bracket in the retracted state, the axes of the piston pins of both the bosses and the center of the two pin holes of the bucket bracket are aligned. A bucket attaching / detaching device characterized in that it is configured to match.