JP2537071Y2 - 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 figure, 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, 13 is a bucket link tip mounting pin hole, Reference numerals 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, the type of work, the content of work, or the work situation is
The work tools attached to the tip of the arm are frequently replaced. For example, a standard bucket is replaced with a special slope bucket or breaker. In that case, the connecting pin must be once removed and reinserted when the required work tool is mounted. When the pins are re-fitted in the above operation, the pin holes of the bracket of the power tool must be aligned with the pin holes of the arm tip boss and the bucket link tip boss. Therefore, a driver who drives the hydraulic excavator to operate the work attachment and a worker who visually checks the hole center and signals the hole center alignment are required. Although not shown, various bucket attaching / detaching devices are taken into consideration so that the driver can automatically perform the hole centering operation alone. However, in these bucket attaching / detaching devices, the hole diameter of both pin holes drilled in parallel with the bucket bracket and the width of the inner surface of the boss of the bracket are the same, but the pitch of both pin holes is different. It was inconvenient to work because it could not be adapted to work tools. An object of the present invention is to solve the above problems.

[0005]

According to the present invention, a link having a front plate and a rear plate that can be bent and rotated in the front-rear direction about a hinge pin with respect to left and right side surfaces of a bucket link tip boss and an arm tip boss, respectively. A plate is provided and connected by a tubular body that fits into the bush hole of the bucket link tip boss bush so that both end faces of the bucket link tip boss are sandwiched between the front inner surfaces of the left and right front plates. The other inner surfaces of the left and right rear plates sandwich the both end surfaces of the arm tip boss, and are connected by another one cylindrical body which fits and penetrates the bush hole of the arm tip boss bush, and The inner diameter of the through hole of each of the two cylindrical bodies is formed in accordance with the diameter of the pin, and the width of the outer end face of each of the left and right front plates and the rear plate is set on the bucket. The bosses are formed in accordance with the widths of the inner surfaces facing each other, and stoppers are formed on the front and rear plates so that the front and rear plates do not form a small angle smaller than the required angle of refraction. And a spring extending between the front plate and the rear plate is provided, and the spring biases the front plate and the rear plate in a direction in which the refraction angle becomes a small angle. A positioning guide plate that can abut against the boss of the bucket bracket is provided on the surface, and when the guide surface of the positioning guide plate abuts against the outer peripheral reference surface of the boss of the bucket bracket, the holes of the two cylindrical bodies are formed. The center diameter and the hole center of the pin hole for the bucket are formed so that the hole diameter of both pin holes of the bucket and the width of the inner surface of the boss of the bracket are the same. Both pin holes Pitch dimensions is to perform the mounting replacement even for different work tools.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing the bucket attaching / detaching device of the present invention. In the figure, 16 is an arm, 17 is a bucket link, 18 is a bucket (indicated by phantom lines), 19 is a bracket standing upright on the back of the bucket 18, and a dimension Px is a pin hole for mounting the tip of the arm drilled in the bracket 18. (The distance between the hole centers) between the pin and the pin hole for mounting the bucket link tip, 20 is the front plate, 21 is the rear plate, 22, 23
Is a stopper formed so as to abut against the front plate 20 and the rear plate 21, respectively, 24 and 25 are positioning guide plates, 26 is a hinge pin, and the angle θx is the front plate 20.
The angle of refraction between the first and second plates 21 and 27 is a spring. FIG.
FIG. 3 is a plan view of the bucket attaching / detaching device of the present invention. In the figure, 28 and 29 are connecting pins, respectively, and 30 and 31.
Is a pin hole of the bracket 19 for the bucket (18), 32 is a bucket link tip boss, and 33 is an arm tip boss. The pin diameters of the pins 28 and 29 are both φD.

FIG. 3 is a sectional view taken along line BB of FIG. In the figure, reference numeral 34 denotes a bush fitted on the left and right ends of the bucket link tip boss 32, 35 denotes a bush fitted on the left and right ends of the arm tip boss 33, 36,.
37 is a cylindrical body, 38 is a countersunk screw for fastening the flange of each of the cylindrical bodies 36 and 37 to the front plate 20 and the rear plate 21;
Reference numeral 39 denotes a stop ring fitted to each of the distal ends of the cylindrical bodies 36 and 37 so that the left and right front plates 20 and the rear plate 21 are not separated. The inner diameters of the through holes 40 and 41 of the cylindrical bodies 36 and 37 are both set to the dimension φD ′. FIG.
FIG. 4 is a side view of an essential part showing an example of application of the bucket attaching / detaching device of the present invention to another bucket 42. In the figure, 43
Is the bracket of the bucket 42, and the dimension Py is the bracket 4
The pitch and angle .theta.y between the pin hole for mounting the tip of the arm and the pin hole for mounting the tip of the bucket link, which are drilled in 3, are the refraction angles between the front plate 20 and the rear plate 21 in the above-mentioned adaptive example. .

Next, the structure of the bucket attaching / detaching apparatus of the present invention will be described with reference to FIGS. In the bucket attachment / detachment device of the present invention, a link having a front plate 20 and a rear plate 21 which can be bent in the front-rear direction around the hinge pin 26 with respect to the left and right side surfaces of the bucket link tip boss 32 and the arm tip boss 33, respectively. A plate (a link member denoted by reference numerals a and b shown in FIG. 2) was provided. And the left and right front plates 2
The right and left rear plates 21 and 21 are fitted to the bush holes of the bush 34 so as to sandwich both end surfaces of the bucket link tip boss 32 between the front inner surfaces 0 and 20 respectively. Arm boss 3 at the rear inner surface of each
3 are connected to each other by a cylindrical body 37 that fits into a bush hole of the bush 35 so as to sandwich both end surfaces of the cylindrical body 3 and penetrates the inner diameters φD ′ of the through holes of the cylindrical bodies 36 and 37 respectively.
8 and 29, and the outer end face width w ′ (shown in FIG. 3) of each of the left and right front plates 20 and 20 and the rear plates 21 and 21 is set to the bucket (1).
8) The width W of the inner surface of the boss of the bracket 19 opposite to the inner surface.
It was formed according to. Also, the front plate 2 and the rear plate 21 are arranged so that the angle between the front plate 20 and the rear plate 21 does not become smaller than the required refraction angle.
0, the stopper portions 22 and 23 are formed with respect to the rear plate 21 and a spring 27 extending between the front plate 20 and the rear plate 21 is provided. And the rear plate 21 were urged. Positioning guide plates 24 and 25 are provided on the outer side surfaces of the front plate 20 and the rear plate 21 so as to be able to abut against the boss of the bracket 19 for the bucket (18), and guide the positioning guide plates 24 and 25 respectively. Surfaces 44 and 45 (FIG. 3)
(See FIG. 3) are brought into contact with the boss outer peripheral reference surfaces 46 and 47 (shown in FIG. 3) of the bracket 19 for the bucket (18).

Next, the operation of the bucket attaching / detaching device of the present invention will be described. First, when attaching the detached bucket 18 to the tip of the work attachment, the driver operates the work attachment of the hydraulic shovel so that the front left and right boss outer peripheral reference surfaces 46, 46 of the bracket 19 for the bucket (18) are moved forward. Positioning guide plate 2 for plates 20, 20
The guide surfaces 44, 44 are brought into contact with the boss outer peripheral reference surfaces 46, 46 by hooking the guide surfaces 4, 24. Since the boss outer peripheral reference surface 46 is formed concentrically with the pin hole 30 of the bracket 19 and the guide surface 44 is formed concentrically with the through hole 40 of the cylindrical body 36, The center of the through hole 40 of the body 36 can be inevitably matched. Next, the driver operates to bring the positioning guide plates 25, 25 of the rear plates 21, 21 into contact with the boss outer peripheral reference surfaces 47, 47 on the rear left and right sides of the bucket (18) bracket 19. . The refraction angle of the front plate 20 and the rear plate 21 becomes the angle θx against the spring force of the spring 27. Guide surfaces 4 of positioning guide plates 25, 25
The boss outer peripheral reference surfaces 47 are formed concentrically with the pin holes 31 of the bracket 19, and the guide surfaces 45 are formed concentrically with the through holes 41 of the cylindrical body 37. Therefore, the center of the through hole 41 of the cylindrical body 37 can be necessarily made to coincide with the center of the pin hole 31 of the bracket 19. Accordingly, when the bucket 18 is mounted, the center of the pin hole of the bracket 19 for the bucket can be automatically aligned with the tip of the bucket 19 by the driver's work attachment operation. An operator who signals the hole alignment is required, and the bucket mounting operation is completed simply by fitting the connecting pins 28 and 29 together. In addition, the bucket attaching / detaching device of the present invention has a hinge pin 26.
The front plate 20 and the rear plate 21 are configured so as to be able to bend and rotate around the center, so that both pins of the bracket of the work tool among other work tools (special buckets, breakers, crushers, etc.) The mounting change can be applied to a work tool in which the hole diameter dimension of the hole and the width of the inner surface of the boss of the bracket are the same, but the pitch dimension of both pin holes is different. As shown in FIG. 4, the pitch between the two pin holes of the other bucket 42 is as large as the dimension Py,
The adaptation becomes possible by increasing the angle of refraction between the first and the rear plate 21 to the angle θy. Therefore, in the hydraulic excavator equipped with the bucket attaching / detaching device of the present invention, the center alignment of the pin hole with respect to the work tool to be replaced can be automatically performed.
A work tool bracket having a different pitch between both pin holes can be replaced to improve work responsiveness.

[0010]

Advantages of the Invention Conventionally, when replacing a work tool such as a bucket at the tip of a work attachment for a hydraulic excavator, two parallel pin holes of a work tool bracket, a pin at an arm tip and a pin at a bucket link tip are provided. Various attachment / detachment devices are considered so that the driver can perform the hole centering alone. However, at the same time, if the pitch dimensions of the two pin holes of the bracket of the work tool to be replaced are different, the prior art bucket attaching and detaching device cannot be replaced. However, in the bucket attaching / detaching device of the present invention, a link plate having a front plate and a rear plate that can be bent and rotated in the front-rear direction around the hinge pin is provided for the left and right side surfaces of the bucket link tip boss and the arm tip boss, respectively. In order to sandwich both ends of the bucket link tip boss between the front inner surfaces of the left and right front plates,
Connected by a cylindrical body that fits into the bush hole of the bucket link tip boss bush and penetrates it, and sandwiches both end faces of the arm tip boss between the rear inner surfaces of the left and right rear plates, respectively.
A spring is provided which is connected to another bushing which is fitted in the bush hole of the arm tip boss bush and penetrates, and which extends between the front plate and the rear plate. A positioning guide plate capable of abutting against a boss of a bucket bracket is provided on the outer surface of each of the front plate and the rear plate so as to urge the front plate and the rear plate in a certain direction. Therefore, by bringing the guide surface of the positioning guide plate into contact with the boss outer peripheral reference surface of the bucket bracket, the hole center of the both cylinders and the hole center of both pin holes for the bucket are automatically matched. Can be. That is, since the center of the pin alignment for the work tool to be replaced can be automatically performed, the labor for the operation of the alignment of the center can be saved. At the same time, the front plate and the rear plate can be bent and rotated so that the pitch between the two cylinders provided on the front plate and the rear plate can be adjusted freely, so that the hole diameter of both pin holes, The mounting can be changed even for a work tool having the same width of the inner surface of the boss of the bracket but different pitch sizes of both pin holes. Therefore, the hydraulic excavator equipped with the bucket attaching / detaching device according to the present invention eliminates the need for the operator to perform the operation of aligning the center of the hole at the time of replacing the work tool, and the work tool having a different pitch between both pin holes of the work tool bracket. However, since the attachment can be changed, work responsiveness can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a bucket attaching / detaching device of the present invention.

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

FIG. 3 is a sectional view taken along line BB in FIG. 1;

FIG. 4 is a side view of an essential part showing an example of application of the bucket attaching / detaching device of the present invention to another bucket.

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

FIG. 6 is a sectional view taken along line AA of FIG. 5;

[Explanation of symbols]

 3,16 arm 4,18,42 bucket 5,17 bucket link 7,19,43 bracket 8,9,28,29 pin 10,33 arm tip boss 11,32 bucket link tip boss 12,13,30,31 pin Hole 20 Front plate 21 Rear plate 22, 23 Stopper 24, 25 Positioning guide plate 26 Hinge pin 27 Spring 36, 37 Cylindrical body 40, 41 Through hole 44, 45 Guide surface 46, 47 Boss outer reference 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 attachment / detachment device adapted to be attached / detached, comprising: a link plate having a front plate and a rear plate that can be bent and rotated in the front-rear direction around a hinge pin with respect to left and right side surfaces of a bucket link tip boss and an arm tip boss, respectively. Provided so as to sandwich both ends of the bucket link tip boss between the front inner surfaces of the left and right front plates, respectively, and to be connected to a bushing hole of the bucket link tip boss bush and connected by a cylindrical body penetrating therethrough, In addition, the bush of the arm tip boss bushing is set so that both end faces of the arm tip boss are sandwiched between the rear inner surfaces of the left and right rear plates. The inner diameter of the through-hole of each of the two cylinders is formed in accordance with the diameter of the pin, and the left and right front and rear plates are connected. Each outer end face width dimension is formed in accordance with the opposing inner face width dimension of the boss of the bracket erected on the bucket, so that the front plate and the rear plate do not have a small angle less than the required refraction angle. A stopper is formed on the front plate and the rear plate, and a spring extending between the front plate and the rear plate is provided, and the spring biases the front plate and the rear plate in a direction in which the refraction angle becomes a small angle. In addition, a positioning guide plate is provided on each of the outer surface portions of the front plate and the rear plate so that the positioning guide plate can abut against the boss of the bucket bracket, and the guide surface of the positioning guide plate is aligned with the boss outer peripheral reference surface of the bucket bracket. Abut At this time, the hole diameters of the both pin holes of the bucket and the width of the inner surface of the boss of the bracket are formed by forming the hole centers of the two cylindrical bodies and the hole centers of the bucket pin holes so as to be coincident with each other. A bucket attaching / detaching apparatus characterized in that replacement is performed even for a working tool having the same dimensions but different pitch dimensions of both pin holes.