JPH0351396Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a hydraulic excavator that allows easy bucket replacement work.

[Prior Art] Hydraulic excavators are equipped with a plurality of buckets of different sizes and types as attachments, so that work can be carried out efficiently by selecting and using the bucket that corresponds to the work situation. FIG. 3 shows a conventional bucket belt mounting structure for a hydraulic excavator.
It is attached to the tip of the arm 3 and the tip of the bucket link 4 via pins 5a and 5b, and can be replaced by attaching and detaching the pins 5a and 5b. still,
6 is a bucket cylinder, 7 is an arm link, 8 is a boom, and 9 is an arm cylinder.

[Problems to be Solved by the Invention] However, the task of replacing the bucket 1 described above requires a large amount of labor because a plurality of workers must attach and detach the pins 5a and 5b.

The present invention makes it possible to easily replace the bucket without attaching or detaching pins.

[Means for Solving the Problems] The present invention comprises attaching a support plate for an arm and a bucket link pivot to one side of a base plate, and attaching a hook plate to the opposite side of the base plate to form a bucket support frame. A hook part into which one pin of the bucket can fit is formed at one end of the plate, and a pin receiver having a semicircular recess is fixed to the other end of the hook plate,
Further, a pin gripping hardware having a recess that forms a pin fitting portion that can match with the recess and grip the other pin of the bucket is pivotally mounted so as to be able to hang under its own weight, and the pin receiving seat and the pin gripping hardware are Fitting grooves are carved on the opposite side of the recess, and a bifurcated fixing device that slidably fits into the fitting groove is connected to a cylinder arranged parallel to the sliding direction of the fixing device. It is characterized in that it is configured so that at least the engagement between the pin gripping hardware and the fixture is released when the fixture is retracted, and that the bucket and bucket support frame are detachable.

[Function] When installing the bucket, first engage and support one pin of the bucket with the hook, and then move the fixing tool forward with the cylinder while the other pin is fitted into the pin seat. The gripping hardware clamps the other pin, and the fixture fixes the pin gripping hardware, and in this state, even if a force is applied to the other pin of the bucket in the direction of opening the pin gripping hardware, that force will not be applied to the fixture. The cylinder is supported by the cylinder, so no load is placed on the cylinder and no rattling occurs.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the bucket 1 is removably attached to a bucket support frame 10 which is attached to the tip of the arm 3 and the tip of the bucket link 4 by pins 5a and 5b.

A pair of support plates 12 on the base plate 11
are fixed to face each other, and the pins 5a and 5b are fitted at the front and rear of the support plate 12. A bracket 13 is provided protruding from the pin 5b side of the fixed surface of the support plate 12 of the base plate 11, and a detachable cylinder 14 is pivotally supported on the bracket 13. Further, a window 15 is bored in the center of the base plate 11, and the detachable cylinder 14 passes through the window 15.

A pair of hook plates 17 having hook portions 16 are fixed to the opposite surface of the base plate 11 to which the support plate 12 is fixed, and the hook plates 1
A semi-cylindrical pin seat 18 is fixed to the side opposite to the hook part 7. A pin gripping hardware 20 that engages with the pin receiving seat 18 to form a cylindrical pin fitting portion 19 is pivotally attached to a pin 22 implanted in the hook plate 17 via an arm plate 21. Grooves 24 and 25 are formed on the outer peripheral surfaces of the pin receiving seat 18 and the pin gripping hardware 20, respectively, into which fixing tools 23, which will be described later, are fitted.

A two-pronged fixture 23 is attached to the rod of the cylinder 14.
The upper teeth 26 and the lower teeth 27, which are shorter than the upper teeth, of the fixture 23 can be fitted into the grooves 24 and 25, respectively, and the fixture 23 is attached to the support plate 12.
The top guide plate 28 is guided by guide plates 28 and 29 provided between the hook plate 17 and the hook plate 17, and the tip of the upper guide plate 28 is connected to the groove 2.
4 and the lower guide plate 29
is shorter than the upper guide plate so as not to hinder the opening and closing of the pin gripping hardware 20.

The operation when attaching and detaching the bucket 1 in the above configuration will be explained.

When the cylinder 14 is retracted, the fixture 23 retreats, the lower teeth 27 are disengaged from the gripping hardware 20, and the gripping hardware 20 hangs down due to its own weight, leaving the inner cylindrical surface of the pin seat 18 exposed. In the state in which the fixture 23 is retracted, the fixture 23 is regulated by upper and lower guide plates 28 and 29.

In this state, one pin 30b of the bucket bag 1 is fitted into the hook portion 16, and the arm 3 is rotated to fit the other pin 30a of the bag bag into the pin seat 18.

Next, the cylinder 14 is extended. cylinder 14
The fixing member 23 moves forward due to the extension of . lower teeth 27
The pin gripping hardware 20 is pushed in and rotated to engage the pin seat 18 and grip the other pin 30a. When the fixture 23 moves forward, it separates from the lower guide plate 29, but the fixture 23 does not fit into the grooves 24, 25.
and is regulated by the upper guide plate 28, so that the guiding state is not lost.

Thus, both the pins 30a and 30b of the bucket 1 are supported and fixed to the bucket support frame 10, and the installation of the bucket is completed.

When performing excavation work etc. with the bucket 1 in this state, even if a force is applied to the pin 30a of the bucket 1 in the direction of opening the pin gripping hardware 20, that force is supported by the fixture 23. cylinder 1
Since no force is applied in the direction of contracting the pin 30a, even if some leakage occurs in the cylinder 14, the state in which the pin 30a is held by the fixture 23 via the pin seat 18 and the pin gripping hardware 20 remains unchanged. ,
It is always held stably and reliably, and the pin 30a does not wobble.

When removing the bucket 1, the above operation may be reversed.

In this way, the bucket 1 can be easily replaced without having to attach and detach the pins 5a and 5b as in the conventional case.
Rather than being connected to the bracket 13, the cylinder 14 is provided separately from the fixture 23 so that it can hang down by its own weight around the pin 22, so the cylinder 14 can be expanded and contracted without rotating around the pivot point relative to the bracket 13. Therefore, the pin gripping hardware 20 can be closed or opened, and the locus of the rod tip of the cylinder 14 becomes a straight line, which greatly simplifies the design and is advantageous in terms of design. The pin 30a can be held stably and reliably without wobbling without putting a burden on the pin 14.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various changes may be made without departing from the gist of the present invention, such as the pin seat and the pin gripping hardware not necessarily having a semi-cylindrical shape. Of course.

[Effects of the invention] As explained above, according to the hydraulic excavator of the invention, the bucket can be easily replaced without attaching or detaching the pin, and furthermore, the pin gripping hardware can be fixed without being connected to the cylinder. Because it is pivoted so that it can hang down under its own weight so that it is separate from the fixture, the fixing fixture can be moved forward and backward in a straight line by the cylinder.
The pin gripping hardware can be closed and opened, which simplifies the trajectory of the cylinder as it expands and contracts, which is advantageous in terms of design, and also stabilizes the gripping state of the other pin of the bucket without putting any strain on the cylinder. In addition, it can be held securely and exhibits an excellent effect of preventing rattling and the like.

[Brief explanation of drawings]

FIG. 1 is a partial diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is an explanatory diagram of a conventional example. 1 is a bucket, 10 is a bucket support frame,
11 is a base plate, 12 is a support plate, 1
4 is a detachable cylinder, 16 is a hook portion, 17 is a hook plate, 18 is a pin seat, 20 is a pin gripping hardware, 23 is a fixture, and 30a and 30b are pins.

Claims (1)

[Scope of utility model registration request] A support plate for the arm and bucket link pivot is attached to one side of the base plate, and a hook plate is attached to the opposite side of the base plate to form a bucket support frame, and one pin of the bucket is fitted to one end of the hook plate. A pin fitting part that forms a hook part that can be fitted together, fixes a pin receiving seat having a semicircular recess to the other end of the hook plate, and that fits the recess and can hold the other pin of the bucket. A pin gripping metal fitting having a recessed portion forming a hole is pivotally mounted so as to be able to hang under its own weight, and a fitting groove is formed on the side opposite to the recessed portion of the pin receiving seat and the pin holding fitting, respectively, and the pin gripping metal fitting is slidable into the fitting groove. A freely fitting bifurcated fixing device is connected to a cylinder arranged parallel to the sliding direction of the fixing device so that it can move forward and backward, and when the fixing device is retracted, at least the engagement between the pin gripping hardware and the fixing device is prevented. A hydraulic excavator characterized in that the bucket belt and the bucket support frame are detachable.