JP2004124382A - Work machine and its attachment mounting device - Google Patents

Work machine and its attachment mounting device Download PDF

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Publication number
JP2004124382A
JP2004124382A JP2002285920A JP2002285920A JP2004124382A JP 2004124382 A JP2004124382 A JP 2004124382A JP 2002285920 A JP2002285920 A JP 2002285920A JP 2002285920 A JP2002285920 A JP 2002285920A JP 2004124382 A JP2004124382 A JP 2004124382A
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JP
Japan
Prior art keywords
attachment
holding
mounting
bucket
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2002285920A
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Japanese (ja)
Inventor
Satoshi Miyaoka
Osamu Mori
宮岡 諭
森 修
Original Assignee
Kobelco Constr Mach Eng Co Ltd
Kobelco Contstruction Machinery Ltd
コベルコ建機エンジニアリング株式会社
コベルコ建機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobelco Constr Mach Eng Co Ltd, Kobelco Contstruction Machinery Ltd, コベルコ建機エンジニアリング株式会社, コベルコ建機株式会社 filed Critical Kobelco Constr Mach Eng Co Ltd
Priority to JP2002285920A priority Critical patent/JP2004124382A/en
Publication of JP2004124382A publication Critical patent/JP2004124382A/en
Withdrawn legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To simplify the mounting structure of an attachment such as a bucket and reduce a distance between upper and lower pins. <P>SOLUTION: While both mounting pins 15, 16 on a bucket side are engaged with both engaging holes 23, 24 of an attachment mounting device 19, a holding member 25 is abutted on the outer peripheral face of the first mounting pin 15 by a hydraulic cylinder 28 and is fixed by the wedge action of a wedge face 25a. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work machine having a work attachment such as a hydraulic shovel, a dismantling machine having a hydraulic shovel as a base, and an attachment mounting device for the work machine.
[0002]
[Prior art]
A description will be given taking a hydraulic excavator as an example.
[0003]
In FIG. 6, reference numeral 1 denotes a crawler type lower traveling body, and an upper revolving superstructure 2 is mounted on the lower traveling body 1 so as to be rotatable around a vertical axis X to constitute a machine body (base machine) M. A boom 3 is provided on the upper revolving superstructure 2 of the main body M, an arm 4 is provided at a tip of the boom 3, and a bucket 5 serving as a work attachment is provided at a tip of the arm 4. The hydraulic excavator is configured to be freely rotatable around the horizontal axis (the boom 3 is raised and lowered) by the expansion and contraction operation of the cylinder).
[0004]
In this excavator, the bucket 5 is replaced with one having a different size or shape as necessary for the work, or the bucket 5 is replaced with a crusher with a clamp-opening / closing type or a vibratory breaker when switching to a demolition machine. . The attachment / detachment work for attachment replacement is performed with the arm 4 hanging down and the bucket 5 grounded as shown in the figure.
[0005]
Attachment mounting device 9 is provided at the tip of arm 4 to facilitate replacement of the attachment such as bucket 5.
[0006]
FIG. 7 is an enlarged view of the attachment mounting device 9 and its peripheral portion.
[0007]
As shown in the figure, the attachment mounting device 9 has a main body fitting 10, and an upper rear portion of the main body fitting 10 (when viewed from the machine main body side with the arm 4 and the bucket 5 suspended as shown in the drawing). The upper rear portion, which is the same in the up-down and front-back directions described below), is attached to the distal end portion of the arm 4 by an arm connecting pin 11.
[0008]
Further, a tip end of a bucket link 12 that transmits the expansion and contraction thrust of the bucket cylinder 8 to the bucket 5 as rotating power is connected to an upper front portion of the main body fitting 10 by a link connection pin 13.
[0009]
On the other hand, a bracket 14 is provided on the back side of the bucket 5 (the upper side when the bucket 5 is suspended as shown in the figure), and first and second mounting pins 15 are provided on both front and rear sides of the bracket 14. , 16 are arranged side by side at intervals, and the lower part of the main body fitting 10 is detachably engaged and connected to the two mounting pins 15, 16.
[0010]
Conventionally, as a technique for engaging and connecting the main body fitting 10 to both of the mounting pins 15 and 16, the body fitting 10 is provided with an outward U-shaped engagement hole and a movable hook that is rotationally driven by a hydraulic cylinder. It is known that the movable hook is rotated and engaged with the first mounting pin 15 while the mating hole is engaged with the second mounting pin 16 (for example, see Patent Documents 1 and 2).
[0011]
According to this known technique, there is no need to attach and detach the heavy mounting pins 15 and 16, so that the attachment replacement operation can be performed efficiently.
[0012]
[Patent Document 1]
No. 7-8599
[Patent Document 2]
Patent No. 2756078
[0013]
[Problems to be solved by the invention]
However, according to the known technique using the above-mentioned movable hook system, there are the following disadvantages.
[0014]
{Circle around (1)} Since a movable hook and its mounting structure are required, the number of parts is large and the structure is complicated, which is disadvantageous in terms of cost and weight.
[0015]
{Circle around (2)} The distance H between the upper and lower pins (see FIG. 7) is increased by the provision of the movable hook and its mounting structure.
[0016]
Therefore, particularly when the bucket 5 is mounted, as shown in FIG. 7, the distance (bucket operating radius) R between the pivot point of the bucket 5 and the tip of the bucket becomes large, so that the excavating force at the tip of the bucket decreases. In addition, as shown by a two-dot chain line in FIG. 7, during the excavation operation of the bucket 5, there is a possibility that the tip of the bucket and the boom 3 or the upper swing body 2 may interfere with each other.
[0017]
SUMMARY OF THE INVENTION The present invention provides a work machine and an attachment mounting device capable of simplifying and reducing the weight of an attachment mounting structure such as a bucket and reducing a distance between upper and lower pins.
[0018]
[Means for Solving the Problems]
The invention (attachment attachment device) according to claim 1 has first and second engagement holes which can be disengaged from first and second attachment pins which are arranged side by side on the attachment side, and The first engagement hole is formed in a U-shape that opens to the attachment side, and the second engagement hole is formed in a U-shape that opens outward in a direction different from the first engagement hole. A holding member movable in a tangential direction of the mounting pin, a fixed position for abutting the holding member on an outer peripheral surface of the first mounting pin to restrain the pin in the engagement hole, and And a holding member driving means for moving the holding member to and from a release position where the holding member is released. The holding member has a wedge surface that performs a wedge action of pushing the first mounting pin into the first engagement hole at the fixed position. It is provided.
[0019]
According to a second aspect of the present invention, in the configuration of the first aspect, the inclination angle of the wedge surface of the holding member is such that the first mounting pin is moved from the first engagement hole at the time of maximum load in a state where there is no driving force by the holding member driving means. The holding member is set in such a size that the holding member can stop at the fixed position against the force in the pushing back direction.
[0020]
According to a third aspect of the invention, in the configuration of the first or second aspect, the first engagement hole is formed as an elongated hole that is long in the direction in which the two engagement holes are arranged.
[0021]
According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, a hydraulic cylinder is used as the holding member driving means, and the holding member driving hydraulic cylinder is provided with two engaging holes between the two engaging holes. It is provided to be inclined on a line intersecting a straight line connecting the holes.
[0022]
According to a fifth aspect of the present invention, in the configuration of the fourth aspect, a lug having a triangular cross section as a reinforcing member is provided on a back surface of the bucket as an attachment, and a hydraulic cylinder for a holding member is provided substantially parallel to a slope of the lug. Things.
[0023]
According to a sixth aspect of the present invention (work machine), an arm is attached to a tip of a boom which is attached to the machine body so as to be able to move up and down so as to be rotatable around a horizontal axis, and an attachment is attached to the tip of the arm by an attachment hydraulic cylinder. A work machine rotatably mounted around a horizontal axis has the following requirements.
[0024]
(I) An attachment attachment device is provided at the tip of the arm, and the attachment is attached to the tip of the arm by the attachment attachment device.
[0025]
(Ii) The first and second mounting pins are arranged side by side at intervals on the attachment.
[0026]
(Iii) The attachment mounting device has first and second engagement holes that can be disengaged from the first and second attachment pins, and the first engagement hole is open to the attachment side. The U-shaped second engagement holes are formed in U-shapes that open outward in a different direction from the first engagement holes.
[0027]
(Iv) a holding member movable in a tangential direction of the first mounting pin to the attachment mounting device, and fixing the holding member to an outer peripheral surface of the first mounting pin to restrain the pin in the engagement hole; Holding member driving means for moving between the position and a release position for retreating from the fixed position and releasing the pin.
[0028]
(V) The holding member is provided with a wedge surface that performs a wedge action of pushing the first mounting pin into the first engagement hole at the fixed position.
[0029]
According to a seventh aspect of the present invention, in the configuration of the sixth aspect, the pipeline branched from both the extension side and the reduction side pipeline of the attachment hydraulic cylinder is connected to the extension side and the reduction side oil chamber of the holding member driving hydraulic cylinder. Is connected to
[0030]
According to the invention of claim 8, in the configuration of claim 7, the bucket as the attachment is attached to the tip of the arm in a state where the bucket performs the excavating operation by the extension operation of the bucket hydraulic cylinder as the attachment hydraulic cylinder, and the bucket hydraulic pressure is increased. The holding member hydraulic cylinder circuit is configured such that the holding member hydraulic cylinder performs the expansion and contraction operation only during the cylinder extension operation.
[0031]
According to the above configuration, the holding member is brought into contact with the outer peripheral surface of the first mounting pin in a state where both the mounting pins are engaged with the both engagement holes, and the holding member is fixed by the wedge action. Compared with the prior art, the movable hook and its mounting structure can be omitted. Therefore, the number of parts of the attachment mounting device can be reduced, the structure can be simplified, and the weight and cost can be reduced.
[0032]
In addition, since the movable hook and its mounting structure can be omitted, the distance between the upper and lower pins of the attachment mounting device can be reduced. Therefore, particularly when the bucket is mounted on a hydraulic excavator, the working radius of the bucket is reduced to increase the excavating force. In addition to this, it is possible to prevent interference between the bucket and the boom or the machine body during excavation.
[0033]
Furthermore, according to the second aspect of the present invention, since the holding member exerts a self-holding force of staying at the pin fixing position by itself against the push-back force acting on the wedge surface, the driving force of the holding member driving means is reduced due to a failure. Alternatively, even in the case of disappearance, there is no possibility that the holding member returns to the release position due to the pin detachment force acting on the wedge surface and the first mounting pin is detached from the first engagement hole.
[0034]
That is, the stability of the attachment attachment state can be enhanced, and the safety can be improved.
[0035]
Further, since it is not necessary to add a lock pin for preventing the pin from coming off, it is not necessary for the operator to go down to the ground from the machine body and operate the lock pin when attaching or detaching the attachment, and the attaching and detaching work becomes easier.
[0036]
Further, since the self-holding force acts, the driving force of the holding member driving means may be small, and the driving means may be small (small diameter in the case of a hydraulic cylinder), so that the distance between the upper and lower pins is further reduced, and The weight of the attachment mounting device can be further reduced.
[0037]
According to the configuration of claim 3, since the first engagement hole is formed as a long hole that is long in the direction in which the two engagement holes are arranged, even if the distance between the front and rear pins varies depending on the size and type of the attachment, the variation is not changed. Can be absorbed. That is, one attachment mounting device can be shared by a plurality of types of attachments having different pin-to-pin distances.
[0038]
According to the configuration of Claims 4 and 5, a hydraulic cylinder is used as the holding member driving means, and the hydraulic cylinder is provided to be inclined on a line intersecting a straight line connecting both engagement holes between both engagement holes. The vertical dimension to be ensured for the cylinder can be reduced as compared with the case where is provided horizontally below the engagement hole.
[0039]
In particular, according to the configuration of claim 5, since the hydraulic cylinder is provided in an inclined state that is substantially parallel to the slope of the lug of the bucket and that requires the smallest vertical cylinder occupation dimension, the distance between the upper and lower pins is minimized. Can be.
[0040]
According to the configuration of the seventh and eighth aspects, in the work machine with the attachment, it is possible to minimize the oil supply / discharge conduit for the hydraulic cylinder for the attachment. For this reason, the piping structure can be simplified and the cost can be reduced.
[0041]
According to the configuration of the eighth aspect, in the working machine in which the bucket is mounted as the attachment, the expansion / contraction operation of the holding member driving hydraulic cylinder (pin fixing / release operation of the holding member) is performed when the bucket hydraulic cylinder is extended. (Only when the bucket is digging), the following operational effects can be obtained.
[0042]
{Circle around (1)} When the bucket hydraulic cylinder is extended in a state where the second engagement hole of the attachment attachment device is engaged with the second attachment pin when the bucket is attached / detached, the second engagement hole moves upward with the upward movement of the bucket. Therefore, falling of the bucket can be prevented, and work safety can be ensured.
[0043]
{Circle around (2)} The bucket hydraulic cylinder may be extended and retracted for both attachment and detachment of the bucket, and it is not necessary to use the extension or contraction properly, so that there is little possibility of erroneous operation.
[0044]
{Circle around (3)} During the excavating operation by the bucket, the hydraulic cylinder for the holding member is extended and the wedge action is strengthened, so that there is no possibility that the first mounting pin is detached from the first engagement hole due to the excavation load.
[0045]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0046]
In the following embodiments, a hydraulic shovel in which a bucket is attached to the tip of an arm as an attachment is taken as an example in accordance with the description of the related art.
[0047]
First embodiment (see FIGS. 1 to 3)
The attachment mounting device 19 has a main body fitting 20, and an upper rear part of the main body fitting 20 (an upper rear part when viewed from the machine main body side with the arm 4 and the bucket 5 suspended as shown in FIG. 7). (The same applies to the up-down and front-rear directions).
[0048]
The front end of the bucket link 12 is connected to an upper front portion of the main body fitting 20 by a link connecting pin 22.
[0049]
On the other hand, on the lower side of the main body fitting 20, a first engagement hole 23 is provided at a front portion and a second engagement hole 24 is provided at a rear portion. The attachment mounting device 19 is connected to the bucket 5 by engaging the first and second mounting pins 15 and 16 provided at intervals on both front and rear sides.
[0050]
Here, the first engagement hole 23 is formed in a U-shape opening downward (bucket side), and the second engagement hole 24 is formed in a U-shape opening rearward (machine body side). After the second engagement hole 24 is engaged with the second mounting pin 16, the first engagement hole 23 is engaged with the first mounting pin 15 so as to cover the first mounting pin 15 from above (the reverse procedure when removing the bucket). Be taken.
[0051]
As means for restraining the first mounting pin 15 in the first engaging hole 23 in the engaged state, a plate-like holding member 25 that moves in a tangential direction of the first mounting pin 15 is provided below the main body fitting 20; Upper and lower guides 26 and 27 (see FIG. 2) for guiding the movement of the holding member 25 and a hydraulic cylinder (hereinafter, referred to as a fixed cylinder) 28 as a holding member driving means are provided.
[0052]
The fixed cylinder 28 is provided between the two engagement holes 23 and 24 so as to be inclined on a straight line (inclination line) Q that intersects with the straight line connecting the two engagement holes 23 and 24. I do.
[0053]
In this case, as shown in FIG. 1, the inclined line Q is set substantially parallel to the inclined surface 29a of the lug 29 having a triangular cross section as a reinforcing member provided on the back surface of the bucket.
[0054]
The holding member 25 is disposed parallel to the upper side of the fixed cylinder 28 and is connected to the rod end of the cylinder 28. The holding member 25 contacts the outer peripheral surface of the first mounting pin 15 as shown in FIG. The pin 15 is moved between a fixed position in which the pin 15 is brought into contact with the first engagement hole 23 and is released from the fixed position to release the pin 15 as shown by a two-dot chain line in FIG. .
[0055]
The holding member 25 is provided with a wedge surface 25a that performs a wedge action for pushing the first mounting pin 15 into the first engagement hole 23 at the fixed position at the distal end side.
[0056]
The inclination angle θ of the wedge surface 25a is set as follows.
[0057]
In a state where there is no driving force by the fixed cylinder 28, a force A is set to push back the first mounting pin 15 by the maximum load of the bucket 5, and the holding member 25 can stay at the fixed position against this force A ( Assuming that B is a force that can exert a self-holding force), the inclination angle θ is set so that A ≒ B, and the value obtained by experiments by the inventor was 10 ° ± 5 °.
[0058]
If the angle θ exceeds 15 °, the self-holding force is not exerted, and if the angle θ is less than 5 °, the wedge surface 25a becomes too long and exceeds the practical limit for installation on the main body fitting 20.
[0059]
In this configuration, when attaching the bucket 5, the bucket attachment 8 is operated in a state where the bucket 5 is grounded and the fixed cylinder 28 is reduced, and the entire attachment mounting device 19 is turned horizontally from the front elevation. To move the second engagement hole 24 into engagement with the second mounting pin 16 so as to scoop it up.
[0060]
Thereafter, the arm 5 is operated to move the bucket 5 so that the first engagement hole 23 is engaged with the first mounting pin 15 so as to cover the first attachment pin 15 from above, and the state shown in FIGS.
[0061]
When the fixed cylinder 28 is extended in this state, the holding member 25 moves to the fixed position as shown in the figure, and the wedge surface 25a contacts the outer peripheral surface of the first mounting pin 15 to restrain the pin 15. Thereby, the bucket 5 can be mounted on the attachment mounting device 19.
[0062]
The removal of the bucket 5 can be performed by the reverse procedure and operation. However, in order to prevent the bucket 5 from dropping during the operation, it is preferable to keep the second engagement hole 24 upward until the removal is completed. desirable.
[0063]
According to the attachment mounting device 19, the following operation and effect can be obtained.
[0064]
{Circle around (1)} With the first and second mounting pins 15 and 16 engaged with the engagement holes 23 and 24, the holding member 25 is brought into contact with the outer peripheral surface of the first mounting pin 15 and the wedge surface 25a is formed. As a result, the movable hook and its mounting structure can be omitted as compared with the prior art using a movable hook. Therefore, the number of parts of the attachment mounting device 19 can be reduced, and the structure can be simplified, lightened, and the cost can be reduced.
[0065]
{Circle around (2)} Since the movable hook and its mounting structure can be omitted, the distance H between the upper and lower pins of the attachment mounting device 19 can be reduced, so that the working radius (R in FIG. 7) of the bucket 5 is reduced to increase the excavating force. And the interference between the bucket 5 and the boom 3 or the upper swing body 2 during excavation can be prevented.
[0066]
{Circle around (3)} Since the fixed cylinder 28 is provided inclined, the upper and lower portions to be secured for the cylinder 28 are compared with the case where the fixed cylinder 28 is provided horizontally below the engagement holes 23 and 24. The dimension in the direction can be reduced, thereby also reducing the distance H between the upper and lower pins.
[0067]
Moreover, since the cylinder 28 is provided in an inclined state that is substantially parallel to the inclined surface 29a of the lug 29 of the bucket 5 and requires the smallest vertical cylinder occupation dimension, the distance H between the upper and lower pins can be minimized. it can.
[0068]
{Circle around (4)} Since the holding member 25 sets the inclination angle θ of the wedge surface 25a such that a self-holding force that stays at the pin fixing position by itself against the push-back force acting on the wedge surface 25a acts, Even if the driving force of the fixed cylinder 28 decreases or disappears due to a failure such as oil leakage, there is no possibility that the first mounting pin 15 is disengaged from the first engagement hole 23.
[0069]
Further, since there is no need to add a lock pin for preventing the pin from coming off, there is no need for the operator to go down to the ground from the machine body and operate the lock pin when attaching or detaching the bucket, and the attaching / detaching operation becomes easier.
[0070]
Further, since the self-holding force acts, the driving force of the fixed cylinder 28 can be small, and the fixed cylinder 28 can have a small diameter. Accordingly, the distance H between the upper and lower pins can be further reduced. Weight can be reduced.
[0071]
FIG. 4 shows a hydraulic circuit for the bucket cylinder 8 and the fixed cylinder 28.
[0072]
In the figure, reference numeral 30 denotes a hydraulic pump as a hydraulic source for the two cylinders 8 and 28; 31 a control valve for controlling the expansion and contraction operation of the bucket cylinder 8; 32 an extension side pipe connecting the control valve 31 and the bucket cylinder 8; Reference numeral 33 denotes the contraction-side conduit. The extension-side conduit 32 is connected to the extension-side oil chamber 28a of the bucket cylinder 28 via the extension-side branch conduit 34, and the reduction-side conduit 33 is connected to the contraction-side branch conduit 35. They are connected to the reduction-side oil chambers 28b, respectively.
[0073]
An electromagnetic switching valve 36 is provided in each of the branch pipes 34, 35, and a throttle 37 is provided at the inlet side of the switching valve 36 in the extension branch pipe 34, and the switching valve 36 is connected to the cylinder extension oil chamber 28 a at the outlet side. A pilot check valve 38 that allows only the inflow of oil and a check valve 39 that allows only the outflow of oil are provided on the outlet side of the switching valve 36 in the reduction side branch pipe 35.
[0074]
The pilot check valve 38 is opened only when the pressure in the reduction side branch pipe 35 is introduced as pilot pressure and the hydraulic pressure in the reduction direction acts on the fixed cylinder 28 (when the rod side pressure becomes higher than the head side pressure). .
[0075]
As described above, the circuit configuration for supplying and discharging the hydraulic pressure to and from the fixed cylinder 28 using the existing bucket cylinder pipelines 32 and 33 is adopted, so that the pipeline for the cylinder 28 is provided independently. In comparison, the cylinder line can be minimized. For this reason, the piping structure can be simplified and the cost can be reduced.
[0076]
In this configuration, the switching valve 36 is set to the illustrated extended position a in a non-energized state when the bucket 5 is mounted.
[0077]
In this state, when the control valve 31 is operated from the neutral position A to the extended position B, the bucket cylinder 8 is extended, and at the same time, the fixed cylinder 28 is pressed in the extended direction.
[0078]
That is, each time the bucket 5 performs the excavation operation, the holding member 25 is pushed to the fixed position side, and the fixed state (bucket mounted state) of the first mounting pin 15 is strengthened.
[0079]
For this reason, the self-holding action of the holding member 25 and the fixing strengthening action make the bucket mounting state more stable, and there is no possibility that the bucket 5 will come off during the work.
[0080]
Even if the control valve 31 is operated to the contraction position C, the supply of oil to the fixed cylinder 28 is prevented by the check valve 39, so that the cylinder 28 does not contract. This is the same when the switching valve 36 is switched to the reduction position b.
[0081]
On the other hand, when the bucket 5 is removed, the switching valve 36 is energized and switched to the reduced position b.
[0082]
When the control valve 31 is operated to the extension position B in this state, the fixed cylinder 28 is reduced together with the bucket cylinder 8, the holding member 25 is retracted to the release position, and the first mounting pin 15 is released.
[0083]
As described above, since the expansion / contraction operation of the fixed cylinder 28 (pin fixing / release operation of the holding member 25) is performed only during the extension operation of the bucket cylinder 8 (during the bucket excavation operation), the following operation and effect can be obtained. Can be.
[0084]
(I) When the bucket cylinder 8 is extended in a state where the second engagement hole 24 of the attachment attachment device 19 is engaged with the second attachment pin 16 when the bucket is attached or detached, the second engagement hole 24 faces upward of the bucket 5. Since the bucket 5 is turned upward with the operation, it is possible to prevent the bucket 5 from dropping, and it is possible to secure work safety.
[0085]
(Ii) The bucket cylinder 8 may be extended and retracted for both attachment and detachment of the bucket 5, and it is not necessary to selectively use extension and contraction.
[0086]
Second embodiment (see FIG. 5)
Only differences from the first embodiment will be described.
[0087]
In the first embodiment, the distance L between the mounting pins 15 and 16 (hereinafter, referred to as a distance between the front and rear pins) is fixed by the first and second engagement holes 23 and 24, and thus the distance L between the front and rear pins is set. Cannot attach different attachments (including buckets of different sizes).
[0088]
Therefore, in the second embodiment, as shown in the drawing, the first engagement hole 23 is formed as a long hole that is long in the front-rear direction (in the illustrated example, obliquely downward and forward in accordance with the fixed cylinder 28).
[0089]
In this way, even if the distance L between the front and rear pins fluctuates due to the attachment, the fluctuation can be absorbed. That is, one attachment mounting device 19 can be shared by a plurality of types of attachments having different distances L between the front and rear pins.
[0090]
By the way, in the above-described embodiment, the case where the bucket 5 is attached to the tip of the arm of the hydraulic shovel is taken as an example. However, instead of the bucket 5, a vibration type breaker, a clamp open / close crusher, or the like can be attached. Further, the present invention is not limited to a working machine having a boom and an arm, and can be applied to a working machine in which an attachment such as a bucket is directly attached to a front portion of a machine body.
[0091]
【The invention's effect】
As described above, according to the present invention, in a state where both attachment pins on the attachment side are engaged with both engagement holes, the holding member is brought into contact with the outer peripheral surface of the first attachment pin, and is fixed by wedge action. Therefore, the movable hook and the mounting structure thereof can be omitted as compared with the known technique using the movable hook. Therefore, the number of parts of the attachment mounting device can be reduced, and the structure can be simplified, lightened, and the cost can be reduced.
[0092]
In addition, since the movable hook and its mounting structure can be omitted, the distance between the upper and lower pins of the attachment mounting device can be reduced. Therefore, particularly when the bucket is mounted on a hydraulic excavator, the working radius of the bucket is reduced to increase the excavating force. In addition to this, it is possible to prevent interference between the bucket and the boom or the machine body during excavation.
[0093]
Further, according to the second aspect of the present invention, since the holding member exerts a self-holding force of staying at the pin fixing position by itself against the push-back force acting on the wedge surface, the driving force of the holding member driving means is reduced due to failure. Also, even in the case of disappearance, there is no danger that the holding member returns to the release position due to the pin detachment force acting on the wedge surface and the first attachment pin detaches from the first engagement hole. Performance can be improved.
[0094]
Further, since it is not necessary to add a lock pin for preventing the pin from coming off, it is not necessary for the operator to go down to the ground from the machine body and operate the lock pin when attaching or detaching the attachment, and the attaching and detaching work becomes easier.
[0095]
Further, since the self-holding force acts, the driving force of the holding member driving means may be small, and the driving means may be small (small diameter in the case of a hydraulic cylinder), so that the distance between the upper and lower pins is further reduced, and The weight of the attachment mounting device can be further reduced.
[0096]
According to the third aspect of the present invention, since the first engagement hole is formed as a long hole that is long in the direction in which the two engagement holes are arranged, even if the distance between the front and rear pins varies depending on the size and type of the attachment, the variation is not changed. Can be absorbed. That is, one attachment mounting device can be shared by a plurality of types of attachments having different pin-to-pin distances.
[0097]
According to the fourth and fifth aspects of the present invention, a hydraulic cylinder is used as the holding member driving means, and the hydraulic cylinder is provided to be inclined on a line intersecting a straight line connecting both engagement holes between the two engagement holes. The vertical dimension to be ensured for the cylinder can be reduced as compared with the case where is provided horizontally below the engagement hole.
[0098]
In particular, according to the fifth aspect of the present invention, the hydraulic cylinder is provided in an inclined state that is substantially parallel to the inclined surface of the lug of the bucket and has a minimum cylinder occupation dimension in the vertical direction, so that the distance between the upper and lower pins is minimized. Can be.
[0099]
According to the seventh and eighth aspects of the present invention, in the work machine with the attachment, it is possible to minimize the oil supply / discharge pipeline to the attachment hydraulic cylinder. For this reason, the piping structure can be simplified and the cost can be reduced.
[0100]
According to the eighth aspect of the present invention, in a working machine having a bucket as an attachment, the expansion / contraction operation of the holding member driving hydraulic cylinder (pin fixing / release operation of the holding member) is performed when the bucket hydraulic cylinder is extended. Since the operation is performed only during the bucket excavation operation, the bucket can be prevented from dropping when the bucket is attached and detached, and the possibility of erroneous operation is reduced.
[0101]
In addition, during the excavation operation by the bucket, the holding member hydraulic cylinder is extended to enhance the wedge action, so that there is no possibility that the first mounting pin is detached from the first engagement hole due to the excavation load.
[Brief description of the drawings]
FIG. 1 is a side view of an attachment mounting device according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view taken along line II-II of FIG.
FIG. 3 is a partially enlarged view of FIG. 1;
FIG. 4 is a hydraulic circuit diagram for a fixed cylinder and a bucket cylinder of the same device.
FIG. 5 is a side view of an attachment mounting device according to a second embodiment of the present invention.
FIG. 6 is an overall schematic side view of the hydraulic excavator.
FIG. 7 is an enlarged view of a bucket mounting portion of the shovel.
[Explanation of symbols]
1 Undercarriage that constitutes the machine body
2 Upper revolving superstructure
3 boom
4 arm
5 buckets
8 Hydraulic cylinder for bucket
15 Bucket first mounting pin
16 Second mounting pin
19 Attachment mounting device
20 Body bracket
23 1st engagement hole
24 Second engagement hole
25 Holding member
25a Wedge surface of holding member
θ Wedge surface inclination angle
28 Hydraulic cylinder as holding member driving means
29 bucket lugs
29a Rug slope
32,33 Both extension side and reduction side pipeline of bucket hydraulic cylinder
34,35 Branch line branched from both lines and connected to hydraulic cylinder for holding member
36 Switching valve for extending and retracting the holding member hydraulic cylinder only when the bucket hydraulic cylinder is extended
39 Check valve

Claims (8)

  1. There are first and second engagement holes that can be disengaged from first and second attachment pins that are arranged side by side on the attachment side at intervals, and the first engagement hole is opened on the attachment side. A holding member that is formed in a U-shape that opens outward in a direction different from that of the first engagement hole, and that can move in a tangential direction of the first mounting pin. A holding member for moving the holding member between a fixed position in which the holding member is brought into contact with the outer peripheral surface of the first mounting pin to restrain the pin in the engagement hole and a release position in which the holding member is retracted from the fixed position to release the pin. An attachment for the working machine, wherein the holding member is provided with a wedge surface for performing a wedge action for pushing the first mounting pin into the first engagement hole at the fixed position. Mounting device.
  2. 2. The attachment mounting device for a work machine according to claim 1, wherein the inclination angle of the wedge surface of the holding member pushes the first mounting pin back from the first engagement hole at the time of maximum load in a state where there is no driving force by the holding member driving means. An attachment mounting device for a working machine, wherein the attachment member is set to a size such that the holding member can stop at a fixed position against a force in the direction.
  3. The attachment attachment device for a working machine according to claim 1, wherein the first engagement hole is formed as a long hole that is long in a direction in which the two engagement holes are arranged.
  4. A hydraulic cylinder is used as the holding member driving means, and the holding member driving hydraulic cylinder is provided to be inclined on a line intersecting a straight line connecting the two engagement holes between the two engagement holes. Item 4. An attachment mounting device for a working machine according to any one of Items 1 to 3.
  5. 5. An attachment for a working machine according to claim 4, wherein a lug having a triangular cross section as a reinforcing member is provided on a back surface of the bucket as an attachment, and a hydraulic cylinder for a holding member is provided substantially parallel to a slope of the lug. Mounting device.
  6. An operation in which an arm is rotatably mounted around the horizontal axis at the end of a boom that is mounted on the machine body so as to be able to move up and down, and an attachment is mounted at the end of this arm so as to be rotatable around the horizontal axis by a hydraulic cylinder for attachment. A work machine characterized by having the following requirements.
    (I) An attachment attachment device is provided at the tip of the arm, and the attachment is attached to the tip of the arm by the attachment attachment device.
    (Ii) The first and second mounting pins are arranged side by side at intervals on the attachment.
    (Iii) The attachment mounting device has first and second engagement holes that can be disengaged from the first and second attachment pins, and the first engagement hole is open to the attachment side. The U-shaped second engagement holes are formed in U-shapes that open outward in a different direction from the first engagement holes.
    (Iv) a holding member movable in a tangential direction of the first mounting pin to the attachment mounting device, and fixing the holding member to an outer peripheral surface of the first mounting pin to restrain the pin in the engagement hole; Holding member driving means for moving between the position and a release position for retreating from the fixed position and releasing the pin.
    (V) The holding member is provided with a wedge surface that performs a wedge action of pushing the first mounting pin into the first engagement hole at the fixed position.
  7. 7. The hydraulic circuit for an attachment according to claim 6, wherein a pipeline branched from both the extension side and the reduction side pipeline of the attachment hydraulic cylinder is connected to both the extension side and the reduction side oil chamber of the holding member driving hydraulic cylinder. Work machine.
  8. 8. The work machine according to claim 7, wherein the bucket as the attachment is attached to the tip of the arm in a state of performing a digging operation by the extension operation of the bucket hydraulic cylinder as the attachment hydraulic cylinder, and when the bucket hydraulic cylinder is extended. A working machine, characterized in that the holding member hydraulic cylinder circuit is configured so that only the holding member hydraulic cylinder performs the expansion and contraction operation.
JP2002285920A 2002-09-30 2002-09-30 Work machine and its attachment mounting device Withdrawn JP2004124382A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002285920A JP2004124382A (en) 2002-09-30 2002-09-30 Work machine and its attachment mounting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002285920A JP2004124382A (en) 2002-09-30 2002-09-30 Work machine and its attachment mounting device

Publications (1)

Publication Number Publication Date
JP2004124382A true JP2004124382A (en) 2004-04-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002285920A Withdrawn JP2004124382A (en) 2002-09-30 2002-09-30 Work machine and its attachment mounting device

Country Status (1)

Country Link
JP (1) JP2004124382A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015200104A (en) * 2014-04-08 2015-11-12 キャタピラー エス エー アール エル Control device for quick coupler of work machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015200104A (en) * 2014-04-08 2015-11-12 キャタピラー エス エー アール エル Control device for quick coupler of work machine

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