JPH047781B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a front attachment exchange device for a shovel type excavator.

[Conventional technology]

A shovel type excavator is configured such that a bucket is pivotally attached to the tip of the arm, and the bucket is tilted via a link operated by a bucket cylinder. teeth,
Various attachments are attached and used in place of the bucket.

In that case, the problem is that the work is extremely difficult and takes a long time to attach and detach the bucket pivot pins (2 pieces) at the tip of the arm and the pins (2 pieces) that connect the tip of the link and the bucket plate. There is,
In order to improve this problem, an attachment mount is attached to the end of the arm and the end of the link via a bucket pivot pin and a pin corresponding to the link pin, and the attachment can be attached to and removed from the attachment mount. A method has been proposed (see Japanese Utility Model Publication No. 61-26446).

[Problem to be solved by the invention]

According to the prior art described in the above-mentioned Japanese Utility Model Publication No. 61-26446, the attachment can be replaced without removing or attaching the pin. However, in this prior art, the fixing wedge is inserted into the locking ring of the attachment. A hydraulic cylinder device is required for the fixation, which requires a separate hydraulic power source and hydraulic piping and parts for it, resulting in an expensive problem.

SUMMARY OF THE INVENTION An object of the present invention is to improve the problems of the prior art as described above, and to provide a device that allows attachments to be replaced simply and easily by hand without requiring a hydraulic cylinder device.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes an arm-side connecting member that is tiltably attached to the tip of the arm via an arm pin and a link pin, and a bucket-side connecting member, and the arm-side connecting member A pair of support plates are fixed to the bottom surface of the board with a space apart for attaching the bucket, and the support plates have semicircular notches through which a pair of pins corresponding to arm pins and link pins fixed to the bucket can be engaged and detached. and a pin that can be engaged with and disengaged from the engaging member on the bucket side is protruded from the inside thereof, and an engagement position where the pin engages with either of the pair of pins on the bucket side is located between the pair of support plates. Attach a rotating plate that can hold the separated retracted position,
On the other hand, the bucket-side connecting member includes a pair of pins fixed to the bucket and corresponding to an arm pin and a link pin, and a pair of engaging members slidably fitted to either of the pair of pins, and The engaging member is formed with an engaging portion that can be engaged with and disengaged from a pin protruding inside the support plate, and a pair of pins fixed to the bucket are engaged with a semicircular cutout of the support plate, and The engaging member is slid to a position where it contacts the inner surfaces of the pair of support plates, the pin inside the support plate is fitted into the engaging part of the engaging member, and this fitted state is engaged with the rotary plate. It is characterized by being maintained by holding it in position.

[Effect]

The front attachment exchange device of the present invention includes:
With the above configuration, the engaging member, which is slidably attached to the pin fixed to the bucket, can be moved between a locking position where it contacts the inside of the support plate and a release position where it is spaced from the inside of the support plate. By sliding between them, the connecting member on the arm side and the connecting member on the bucket side can be connected or disconnected, and the connected or disconnected state is maintained with the rotary plate in the engaged position or the retracted position. This can be maintained by doing so.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Figure 1 is a side view of the main parts, Figure 2 is the − of Figure 1.
3 is an explanatory diagram showing the state at the time of replacement.

In FIGS. 1 and 2, reference numeral 10 indicates an arm constituting the front portion of a hydraulic excavator, 11 indicates a front attachment such as a bucket belt, and 12 indicates a front attachment exchange device according to the present invention.

The front attachment exchange device 12 includes an arm-side connecting member 13 attached to the arm 10.
and a bucket-side connecting member consisting of pins 26, 27 fixed to the bucket 11 and engaging members 14, 15 slidably attached to the pins 27.

The arm-side connecting member 13 has a structure in which support plates 17 and 18 are attached to the upper surface of a substrate 16, and another set of support plates 19 and 20 are attached to the lower surface of the substrate. The support plates 17, 18 are arranged parallel to each other with a spacing related to the width of the arm 10 and the link 21. The support plate 17 has a pin hole 22a having a diameter corresponding to the pin hole for pivotally supporting the bucket belt 11 on the arm 10, and a pin hole 2 corresponding to the pin hole for connecting the tip of the link 21 to the bucket belt.
3a, and the support plate 18 is provided with pin holes 22b and 23b coaxially with these pin holes (the pin hole 23b is not shown in the drawing).

Another set of support plates 19, 20 includes a portion 11 that connects the bucket to the arm 10 and the link 21.
The support plate 19 has a semicircular cutout having an inner diameter corresponding to a pin hole for connecting the arm 10 and the link 21 to the bucket 11. Notch 24
a and 25a, and the support plate 20 also has cutouts 24b, 2 similar to the cutouts 24a, 25a.
5b (notch 24b not shown).

Further, a pair of short pins 33a and 34a are protruded from the inner surface of the support plate 19, and similarly, short pins 33b and 34b are protruded from the inner surface of the support plate 20 (34b is not shown). It has not been).

Furthermore, a rotary plate 32 is disposed between the support plates 19 and 20 and is rotatably attached to a shaft 35 that passes through both support plates and is fixed.
2 is configured to be able to hold the locking position and the retracted position, as will be described later.

The arm-side connecting member 13 configured as described above is pivotally attached to the tip of the arm 10 by inserting the pin 28 into the pin holes 22a, 22b, and the pin 29 at the tip of the link 21 is inserted into the pin holes 23a, 23b. It is configured such that it can be inserted and tilted by a bucket cylinder (not shown).

On the other hand, the bucket 11 has a pin 26 corresponding to an arm pin between the pair of left and right connecting parts 11A,
A pin 27 corresponding to a link pin is fixed, and a pair of left and right engaging members 14 and 15 are attached to the pin 27 so as to be slidable on the pin 27. That is, the engaging members 14 and 15 have pin holes 30 and 3 having a diameter corresponding to the pin 27.
1, and with the pin 27 inserted into the pin holes 30 and 31, both ends of the pin 27 are fixed to the connecting parts 11A and 11A of the bucket bag.

The engagement member 14 has semicircular notches 37a and 38a into which short pins 33a and 34a protruding from the inner surface of the support plate 19 are fitted when the engagement member 14 comes into contact with the inner surface of the support plate 19. Similarly, the engagement member 15 is also formed with semicircular notches 37b and 38b into which short pins 33b and 34b protruding from the inner surface of the support plate 20 are fitted (38b is (not shown).

The rotary plate 32 is held at the engagement position by inserting the pin 36 into the pin hole 36a in a state in which the tip side thereof is curved and the curved portion is engaged with the pin 27. The retracted position can be maintained by removing the pin 36 from the rotary plate 32 and inserting the pin 36 into the pin hole 36b at a position where the rotating plate 32 is rotated toward the substrate 16. Note that the width of the rotary plate 32 is slightly wider than the total width of the two engaging members 14 and 15, and the engaging members 14 and 15 are supported by the supporting plates 19 and 15, respectively.
The rotary plate 32 is in contact with the inner surface of 20.
When the engaging members 14, 1 are positioned in between,
5 should have a width that does not allow it to slide in the approach direction.

Further, in the illustrated embodiment, when the receiving plates 39 and 40 are fixed to the substrate 16 on the inner surface side of the supporting plates 19 and 20 and the engaging members 14 and 15 are in a position where they are in contact with the inner surfaces of the supporting plates 19 and 20. , the upper end surfaces of the engaging members 14, 15 are supported by receiving plates 39, 40.

The front attachment exchange device of the present invention includes:
With the above configuration, the rotation of the rotary plate 32 and the engagement members 14, 15 are controlled as described below.
sliding on the pin 27 allows the front attachment to be easily and easily replaced.

To remove the bucket 11, as shown in FIG. 3, after placing the bucket 11 on the ground, pull out the pin 36 from the pin hole 36a, rotate the rotary plate 32 to the retracted position, and insert the pin 36 into the pin hole 36b. to hold the rotary plate 32 in the retracted position, and then slide the engaging members 14 and 15 onto the pin 27 so as to approach each other to remove the pins 33a, 33b and the pin 34.
Semicircular notches 37a, 38a from a, 34b
This can be done by removing 37b and 38b and raising the arm 10 in this state.

To connect other buckets, etc., lower the arm 10 and connect the engaging members 14 and 1 between the support plates 19 and 20.
5 and slide the engaging members 14, 15 outward on the pins 27 to connect the notches 37a, 38a and 37b, 38b to the pins 33 of the support plates 19, 20.
a, 33b and pins 34a, 34b, and in this state, pull out the pin 36 from the pin hole 36b, rotate the rotary plate 32 to engage the curved part of the tip with the pin 27, and then insert the pin 36 into the pin hole 36a. This can be done by inserting the

As described above, in the exchanger according to the present invention, not only the bucket 11 but also the pins 26 and 27 and the engaging member 14 are attached to mechanical grips with forks, grips using electromagnets, breakers for crushing rocks, etc. , 15, various front attachments can be easily and easily replaced depending on the purpose of the work.

Further, the front attachment exchange device of the present invention is incorporated into a hydraulic excavator, and when excavating or the like, the load is transmitted to the pins 33a, 33.
b, 34a, 34b and the pins 26, 27 on the front attachment 11, but the notches 24a, 24 that engage with these pins
b, 37a, 37b and 25a, 25b, 38
a, 38b are formed in a semicircular shape, so that even if abrasion occurs, a predetermined contact area with the pin can be maintained, and durability and reliability are high.Especially, as in the embodiment, the engaging members 14, 15 is the receiving plate 39, 40
By making contact with the support plates 39 and 40, the load can also be received by the receiving plates 39 and 40, so that a large load can be withstood.

4 to 6 show other embodiments of the front attachment exchange device of the present invention.

This front attachment exchange device
This device is an improvement on the device shown in FIGS. 3 to 3, and includes means for fixing the positions of the engaging members 14 and 15 and contacting the receiving plates 39 and 40 when the front attachment is removed. The rotary plate 32 is provided with means for ensuring that these contacts can be made even if the engaging portions are worn out.
The engagement position and the retracted position can be maintained at one location.

One end of the stay 52 is fixed to the bucket 11,
At the other end of the stay 52 is a pin 5 that is integral with the stay.
1 is formed. And this pin 51 is
It is arranged between the engaging members 14 and 15 and coaxially with the pins 33a and 33b.

Moreover, the pins 33a, 33b, 34a, 34b into which the semicircular notches of the engaging members 14, 15 are fitted
are rotatably held by the support plates 19 and 20, and lock nuts 53a and 53a screwed into threaded portions protruding from the support plates, respectively.
Rotation is stopped by 53b, 54a, and 54b. Further, the portions of the pins 33a, 33b, 34a, 34b that fit into the notches 37a, 37b, 38a, 38b of the engaging members 14, 15 are eccentric with respect to the portions held by the support plates 19, 20. , the engaging members 14 and 15 can be moved up and down when rotated on the support plate.

Furthermore, a ring-shaped boss member 5 is provided on the support plate 19.
4 is formed concentrically with the pin 35, and
and the boss member 54, as shown in FIG.
Holes 55 and 56 passing through these are provided, and a rotation stopper 57 is inserted into these through holes to fix the rotating plate 32. moreover,
The pin 35 is provided with a cross hole 58 that matches the hole 56 of the boss member 54 when the pin 35 is rotated. The rotation stopper itself is in the form of a clip called a beta pin.

In this embodiment, when the bucket 11 is separated from the arm 10, when the engaging members 14 and 15 are slid in the direction toward each other, the notches 37a and 37b of the engaging members fit into the pin 51. , pin 2
Rotation around 7 is prevented. In other words, since the positions of the engaging members 14 and 15 are fixed, the pins 33a, 33b, 34a, 34b when attached next time are fixed.
The fitting between the notches 37a, 37b, 38a, and 38b can be performed extremely easily and quickly.

Furthermore, due to long-term use, the receiving plates 39, 40
If the end surfaces of the engaging members 14, 15 that are in contact with the lock nuts 53a, 53b, 54a are worn out and a gap is created between the receiving plates 39, 40 and the end surfaces of the engaging members 14, 15, the lock nuts 53a, 53b, 54a , 54b, rotate the pins 33a, 33b, 34a, 34b to move the engaging members 14, 15 toward the receiving plates 39, 40, bring them into contact, and then loosen the lock nuts 53a, 53b, 54a. , 54b to fix the pins 33a, 33b, 34a, 34b again, the contact between the engaging member and the receiving plate can be restored. FIG. 5 shows the state in which the gap has been eliminated as described above. Further, when the rotary plate 32 is rotated, the rotary plate 32 can be held at each rotational position by inserting the rotation stopping member 57 into the holes 55, 56 or 56, 58.

〔Effect of the invention〕

As described above, according to the present invention, the front attachment can be easily and easily replaced by rotating the rotating plate and sliding the locking member without using a hydraulic cylinder or the like. be.

[Brief explanation of drawings]

1 to 3 show an embodiment of the front attachment exchange device of the present invention, in which FIG. 1 is a side view, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG.
FIG. 3 is an explanatory diagram showing the state at the time of replacement. Fourth
6 to 6 show other embodiments of the front attachment exchange device of the present invention, in which FIG. 4 is a side view, FIG. 5 is a sectional view taken along the - line in FIG. 4, and FIG. 5 is a partially enlarged side view taken along the line - in FIG. 5.

Claims (1)

[Claims] 1. Consists of an arm-side connecting member that is tiltably attached to the tip of the arm via an arm pin and a link pin, and a bucket-side connecting member, and the arm-side connecting member is attached to the bottom surface of the board. A pair of support plates are fixed at a distance for attaching a bucket belt, and a semicircular notch is formed in the support plate to allow a pair of pins corresponding to an arm pin and a link pin fixed to the bucket belt to be engaged and detached. A pin that can be engaged with and disengaged from an engagement member on the bucket side is provided protrudingly on the inside, and an engagement position where the pin engages with one of the pins on the bucket side and a retracted position away from the pin are held between the pair of support plates. Install a rotating plate that can be
On the other hand, the bucket-side connecting member includes a pair of pins fixed to the bucket and corresponding to an arm pin and a link pin, and a pair of engaging members slidably fitted to either of the pair of pins, and forming an engaging portion on the engaging member into which a pin protruding from the inside of the support plate can be fitted, and causing a pair of pins fixed to the bucket to engage with a semicircular notch of the support plate; The pair of engagement members are slid to a position where they come into contact with the inner surfaces of the pair of support plates, the pins on the inside of the support plates are fitted into the engagement portions of the engagement members, and this fitted state is maintained when the rotation plates are A front attachment exchange device for a shovel type excavator, characterized in that it is maintained by holding it in an engaged position. 2. The receiving plate is fixed to the substrate on the inner surface of the pair of support plates, and the upper end surface of the engaging member is supported by the receiving plate when the engaging member is in contact with the inner surface of the pair of supporting plates. A front attachment exchange device for a shovel excavator according to claim 1, characterized in that: