WO2011148601A1

WO2011148601A1 - Work attachment and work machine

Info

Publication number: WO2011148601A1
Application number: PCT/JP2011/002814
Authority: WO
Inventors: 克哉入枝
Original assignee: コベルコ建機株式会社
Priority date: 2010-05-26
Filing date: 2011-05-20
Publication date: 2011-12-01
Also published as: JP5353818B2; EP2578753A4; CN103025963A; EP2578753A1; JP2011246931A; CN103025963B; EP2578753B1

Abstract

Provided is a work attachment which can be stably supported in a folded state, and which is such that damage to a work device cylinder and a link mechanism can be prevented. Also provided is a work machine equipped with said work attachment. A work cylinder (32) and a link mechanism (33) are provided on the upper surface of an arm (27) in a folded state, in such a way that the work cylinder (32) and the link mechanism (33) are positioned between a boom (25) and the tip section of the arm (27). When an inter-boom cylinder (30) and an arm cylinder (31) are in a folded state, the same are positioned above the base end of the arm (27). A ground contact section (27a) is formed at least on a portion of the lower surface of the arm (27), which is in a folded state, said ground contact section (27a) extending over a longitudinal range which is sufficient to support the whole of a work attachment (24).

Description

Work attachment and work machine

The present invention relates to a work machine such as a dismantling machine having a base machine and a work attachment attached to the base machine.

Conventionally, for example, a dismantling machine with an ultra-long attachment used for dismantling a high-rise building is known.

As shown in FIG. 5, the dismantling machine includes a base machine 3 having a crawler-type lower traveling body 1 and an upper revolving body 2 mounted on the lower traveling body 1 so as to be rotatable about a vertical axis, And a work attachment 4 attached to the front portion of the base machine 3.

The work attachment 4 includes a boom 5 that can be raised and lowered to the base machine 3 (upper swing body 2), and a short length that is attached to the tip of the boom 5 so as to be rotatable about a horizontal axis for the purpose of expanding the work range. The inter-boom 6, an arm 7 attached to the tip of the inter-boom 6 so as to be rotatable about a horizontal axis, and a working device 8 attached to the tip of the arm 7. In FIG. 5, an open / close type crusher called a nibler is shown as the working device 8, but an excavating bucket or a crushing breaker may be attached as the working device 8.

The boom 5 has a lower main boom 5a and an upper front boom 5b detachably connected to the main boom 5a.

The dismantling machine is disassembled and transported into a set including the base machine 3 and the main boom 5a and a set of the work attachment 4 excluding the main boom 5a (see FIG. 6). It is done.

Note that the front boom 5b usually has a plurality of stages of boom bodies that are detachably connected to each other, but the front boom 5b formed by a single member is shown for the sake of simplicity of the drawing.

Further, the dismantling machine rotates a boom cylinder 9 that raises and lowers the boom 5 (the entire attachment), an inter boom cylinder 10 that operates the inter boom 6, and an arm 7 as a cylinder (hydraulic cylinder) that operates the work attachment 4. An arm cylinder 11 to be moved and a work device cylinder 12 to turn the work device 8 are provided. The dismantling machine has a link mechanism 13 that converts the thrust of the working device cylinder 12 into turning power and transmits it to the working device 8.

The inter boom cylinder 10 is provided between the boom 5 (front boom 5b) and the inter boom 6 on the front side of the attachment. The arm cylinder 11 is provided between the inter boom 6 and the arm 7 on the front side of the attachment.

Also, the work device cylinder 12 is provided between the arm 7 and the work device 8 on the attachment rear side.

The configurations described above are shown in Patent Documents 1 and 2.

Further, Patent Document 3 discloses that the working device cylinder 12 and the link mechanism 13 are arranged on the opposite side (arm front side) from the dismantling machine shown in FIGS.

Conventionally, the disassembly and assembly of the above-described dismantling machine with an ultra-long attachment is performed as shown by the solid line in FIG. 5 and FIG. Specifically, when disassembling and assembling the dismantling machine, the inter-boom cylinder 10 and the arm cylinder 11 are in the most contracted state, and the boom 5 is on the upper side and the arm 7 is on the lower side with the inter-boom 6 as a boundary. The work attachment 4 is folded and placed on the ground so that

During transportation, the main boom 5a and the front boom 5b are separated while the work attachment 4 is folded as shown in FIGS. Specifically, the work attachment 4 is separated into a set including the base machine 3 and the main boom 5a and a set of the work attachment 4 excluding the main boom 5a. Then, the set separated from the base machine 3 is transported on a transport vehicle 14 such as a trailer as shown in FIG. At this time, the working device 8 is detached from the arm 7.

The assembly work after transportation and the work of reassembling the work attachment 4 according to the application are performed in the same manner.

5 to 7, the grounding bracket 15 provided on the lower surface side of the arm in the folded state is not disclosed in Patent Documents 1 to 3, but assumed to limit the grounding position of the work attachment 4. It is what is done.

However, in the dismantling machine shown in FIGS. 5 to 7, when the work attachment 4 is disassembled, assembled and transported, the work attachment 4 is folded and grounded as shown by the solid line in FIG. 5 or in the transport vehicle 14 as shown in FIG. In the loaded state, the arm 7 located on the lower side is grounded only in a very small portion (actually, the bracket 15) as shown in the figure. Therefore, in a state where the front boom 5b is disconnected from the main boom 5a, the support state (self-supporting state) of the work attachment 4 becomes unstable.

Therefore, conventionally, the work attachment 4 is supported by the cradle 16 shown by a two-dot chain line in FIG. 6 during disassembly, assembly, and transportation.

In other words, conventionally, the arm shape and the folding posture are determined on the assumption that the work attachment 4 is supported by the pedestal 16 in the folded state.

However, although this pedestal 16 is shown in a simplified manner in FIG. 6, in actuality, it is necessary to have a full-scale one sufficient to stably support the entire attachment. Specifically, since the structure 16 is complicated, large, and has a large weight, the table 16 is disadvantageous in terms of cost and handling.

Also, since the entire attachment is raised by the cradle 16, the total height H1 (see FIG. 5) of the attachment during disassembly, assembly, and transportation is increased. As a result, the disassembling and assembling work becomes a work at a high place, which is disadvantageous in terms of workability and safety, and there is also a transportation obstacle such as a low-floor trailer transportation.

Furthermore, the work device cylinder 12 and the link mechanism 13 (hereinafter, they may be collectively referred to as a work device cylinder mechanism) are located on the lower surface side (ground surface side) in the folded state. Therefore, there is a possibility that the working device cylinder mechanism may be damaged due to contact with the ground or the loading platform, and since the arm tip side needs to be folded up in order to avoid this, the total height H1 of the attachment becomes larger.

In the crushing work vehicle described in Patent Document 3, the working device cylinder mechanism is located on the upper surface side of the arm in the attachment folded state. Therefore, there is no risk of contact between the work device cylinder mechanism and the ground and the loading platform, but the problem of the attachment support being unstable, the necessity of the mounting platform, and the increase in the total height of the attachment due to the mounting platform is solved. Not.

JP-A-11-193543 Japanese Utility Model Publication No. 5-67652 JP-A-8-226236

An object of the present invention is to provide a work attachment that can be stably supported in a folded state and that can prevent breakage of a work device cylinder and a link mechanism, and a work machine including the work attachment.

In order to solve the above-described problems, the present invention provides a work attachment that can be attached to a base machine of a work machine, the boom being attached to the base machine so as to be able to undulate, and the pivot of the boom about a horizontal axis An inter boom that can be attached, an arm that is attached to the tip of the inter boom so as to be rotatable about a horizontal axis, a working device that is attached to the tip of the arm, and a boom cylinder for raising and lowering the boom And an inter boom cylinder that is provided between the boom and the inter boom and that rotates the inter boom, and is provided between the inter boom and the arm and that rotates the arm. Arm cylinder, working device cylinder for rotating the working device, the working device and the working device A link mechanism provided between the robot and the Linda, and when the inter boom cylinder and the arm cylinder are most reduced, the boom is on the upper side and the arm is on the lower side of the inter boom. The working device cylinder and the link mechanism are foldable in a folded state, and the working device cylinder and the link mechanism are located on the upper surface side of the arm in the folded state so as to be positioned between the tip of the arm and the boom in the folded state. The inter boom cylinder and the arm cylinder are located on a base end portion of the arm in the folded state, and the arm is sufficient to support the entire work attachment in the folded state. Providing work attachments that have a grounding section that can be grounded over a length range That.

The present invention also provides a work machine comprising a base machine and the work attachment attached to the base machine so as to be raised and lowered.

According to the present invention, it is possible to stably support the work attachment in the folded state, and to prevent the working device cylinder and the link mechanism from being damaged.

It is a schematic side view of the folding state of the dismantling machine with a super-long attachment concerning the embodiment of the present invention. It is the figure which expanded a part of FIG. It is a schematic side view of the state which isolate | separates and transports a work attachment from a base machine and a main boom. FIG. 4 is a view corresponding to FIG. 3 in a state in which the working device cylinder is contracted from the state shown in FIG. In order to demonstrate the conventional demolition machine, it is the schematic side view which adds the said conventional demolition machine and the structure assumed to this, and shows. It is a schematic side view at the time of attachment transportation of the dismantling machine shown in FIG. FIG. 6 is a partially enlarged view of the dismantling machine shown in FIG. 5 during disassembly / assembly and transportation.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings 1 to 4. In addition, the following embodiment is an example which actualized this invention, Comprising: It is not the thing of the character which limits the technical scope of this invention.

In the following embodiment, a demolition machine with an ultralong attachment will be described as an example of a work machine in accordance with the description of the background art.

As shown in FIG. 1, the demolition machine includes a base machine 23 having a crawler-type lower traveling body 21 and an upper revolving body 22 mounted on the lower traveling body 21 so as to be rotatable about a vertical axis, And a work attachment 24 attached to the front portion of the machine 23 so as to be raised and lowered.

The work attachment 24 includes a boom 25 attached to the base machine 23 (upper turning body 22) so as to be raised and lowered, a short inter boom 26 attached to the tip of the boom 25 so as to be rotatable around a horizontal axis, An arm 27 is attached to the tip of the inter boom 26 so as to be rotatable about a horizontal axis, and a working device 28 is attached to the tip of the arm 27.

The work attachment 24 includes a boom cylinder 29 that raises and lowers a boom 25 (the entire work attachment 24) relative to the base machine 23, an inter boom cylinder 30 that rotates the inter boom 26 relative to the boom 25, and the inter boom 26. A pair of arm cylinders 31 (only one is shown in the figure) for rotating the arm 27, a working device cylinder 32 for rotating the working device 28 relative to the arm 27, and the working device cylinder 32 and the arm 27. And a working mechanism 28. The link mechanism 33 is for converting the thrust of the working device cylinder 32 into the rotational force and transmitting it to the working device 28. The inter boom cylinder 30 is provided between the boom 25 (front boom 25b) and the inter boom 26 on the front side of the work attachment 24 (the surface facing forward when the entire work attachment 24 is expanded and raised). ing. The arm cylinder 31 is provided between the inter boom 26 and the arm 27 on the front side of the work attachment 24.

In the dismantling machine according to the present embodiment, the work attachment 24 can be displaced to the folded state during disassembly and transportation. Specifically, in the folded state, as shown in FIGS. 1 to 4, the boom 25, the inter boom 26, and the arm 27 can be connected by setting the inter boom cylinder 30 and the arm cylinder 31 in the most contracted state. When the boom 25 is folded down and the arm 27 is grounded, the boom 25 is on the upper side and the arm 27 is on the lower side with the inter boom 26 as a boundary. Then, the work attachment 24 in the folded state is placed on the ground, and as shown in FIGS. 3 and 4, the work attachment 24 is separated into a set of the base machine 23 and a main boom 25a described later, and a set of the work attachment 24 excluding the main boom 25a. Can do. The set of the work attachments 24 excluding the main boom 25a separated in this way is transported by the transport vehicle 34, and can be assembled to the base machine 23 by the reverse procedure to the above after transport.

Hereinafter, the work attachment 24 will be specifically described.

The boom 25 has a main boom 25a having a base end portion attached to the base machine 23, and a front boom 25b having a base end portion detachably connected to the tip end portion of the main boom 25a. The front boom 25b includes a front boom body 25b1 and an inter boom cylinder mounting portion 25b2 provided on the front side of the front boom body 25b1. The front end portion of the front boom body 25b1 is rotatably attached to the inter boom 26. One end (head side end) of the inter boom cylinder 30 is rotatably attached to the inter boom cylinder mounting portion 25b2. The inter boom cylinder mounting portion 25b2 is provided at the center position in the width direction (left-right direction) of the front boom body 25b1.

The inter boom 26 includes an inter boom main body 26a having a base end portion rotatably attached to the front boom main body 25b1 around the horizontal axis J1, and an inter boom cylinder attached to the front surface of the inter boom main body 26a. Part 26b and a pair of arm cylinder mounting parts 26c (only one is shown in the figure) provided on the side surface in the width direction (left-right direction) of the inter boom body 26a. The distal end portion of the inter boom main body 26 a is attached to the arm 27 so as to be rotatable around a horizontal axis J <b> 2 (base end attaching portion). One end (rod side end) of the inter boom cylinder 30 is attached to the inter boom cylinder mounting portion 26b so as to be rotatable at an attachment point A. Further, the inter boom cylinder mounting portion 26 b is provided at the center position in the width direction of the inter boom 26. Further, the inter boom cylinder mounting portion 26 b is provided at a position closer to the tip than the intermediate portion of the inter boom 26. One end of the arm cylinder 31 can be attached to each of the pair of arm cylinder attachment portions 26c. Specifically, in the pair of arm cylinders 31, the inter boom 26 and the arm 27 are arranged on both sides in the width direction so as to sandwich the inter boom cylinder 30 from the left and right. One end (head side end) of each of the arm cylinders 31 is attached to a pair of arm cylinder attachment portions 26c so as to be rotatable at an attachment point B. The pair of arm cylinder mounting portions 26c is provided at a position closer to the base end than the inter boom cylinder mounting portion 26b, and protrudes forward from the side surface of the inter boom 26 beyond the front surface. The pair of arm cylinder mounting portions 26c protrude rearward and obliquely upward from the inter boom 26 in the folded state.

The arm 27 includes an arm main body 27d having a base end portion rotatably attached to the inter boom main body 26a, and a pair of arm cylinder mounting portions 27e provided on the side surfaces in the width direction of the arm main body 27d (see FIG. , Only one is shown), and a work device cylinder mounting portion 27f provided on the front surface of the arm main body 27d. The distal end portion of the arm main body 27d is attached to the working device 28 so as to be rotatable around the horizontal axis J3. Further, the upper surface of the arm main body 27 d in the folded state is formed in an upward convex shape so that the cross-sectional area of the arm main body 27 d is maximized at an intermediate point C in the length direction of the arm 27. Specifically, in the folded state, a portion of the upper surface of the arm main body 27d on the front end side with respect to the intermediate point C is an inclined surface 27b that descends toward the front end of the arm main body 27d. On the other hand, in the folded state, a portion of the upper surface of the arm main body 27d on the base end side with respect to the intermediate point C is an inclined surface 27c that descends toward the base end of the arm main body 27d. By forming the inclined surface 27b, the arm front end side space S1 (see FIG. 2) formed between the front end portion of the arm main body 27d and the boom 25 (front boom 25b) can be expanded. Further, by forming the inclined surface 27c, the arm base end side space S2 (see FIG. 2) formed between the base end side portion of the arm main body 27d and the front boom 25b can be expanded. The arm distal end side space S1 can be used as a space for installing the work device cylinder 32, and the arm proximal end side space S2 can be used as a space for installing the inter boom cylinder 30 and the arm cylinder 31. it can.

Further, at least a part of the lower surface of the arm main body 27d in the folded state is formed with a grounding portion 27a that can be grounded over a sufficient length range to support the entire work attachment 24. The grounding portion 27a is a flat surface arranged horizontally (parallel to the ground) in the folded state. When the grounding portion 27a is grounded, the work attachment 24 in the folded state can be supported on the ground or the loading platform. In the present embodiment, the ground contact portion 27a is provided over almost the entire length of the arm main body 27d including the portion directly below the center of gravity of the attachment (the work attachment 24 or the portion of the work attachment 24 excluding the main boom 25a) in the folded state. It has been. Since the grounding portion 27a is provided over a wide range as described above, the work attachment 24 can be made independent and supported in a stable state during disassembly, assembly, or transportation. Thereby, the stand used for supporting the conventional work attachment 24 can be omitted or replaced with a complementary simple or small one. Therefore, the cost and handling of the work attachment 24 are advantageous, and the height of the attachment H2 (the height of the attachment excluding the main boom 25a, see FIG. 1) is reduced by eliminating or raising the height by the stand, and disassembling or The workability, safety, and transportability of the assembly work can be improved.

In the present embodiment, the ground contact portion 27a is provided in a portion of the lower surface of the arm body 27d in a folded state, excluding the distal end portion and the proximal end portion (the hatched portion in FIG. 2). Specifically, the horizontal axes J2 and J3 that connect the arm 27 and the inter boom 26 or the work device 28 are disposed above the grounding portion 27a in the folded state. The lower surface of the arm main body 27d in a folded state has a base-side inclined surface 27g that inclines upward from the base end of the grounding portion 27a toward the horizontal axis J2, and a horizontal axis J3 from the tip of the grounding portion 27a. And a tip-side inclined surface 27h that is inclined upward.

The pair of arm cylinder mounting portions 27e can rotatably mount one end (rod side end) of the arm cylinder 31. Specifically, the pair of arm cylinder mounting portions 27e is provided within the length range of the arm main body 27d formed with the inclined surface 27c on the proximal end side of the arm main body 27d, and is inclined from the side surface of the arm main body 27d to the inclined surface 27c. Projecting forward beyond. On the other hand, the work device cylinder mounting portion 27f can turnably attach one end (head side end) of the work device cylinder 32. Specifically, the work device cylinder mounting portion 27f protrudes forward from the inclined surface 27b on the distal end side of the arm main body 27d. As described above, in this embodiment, the arm cylinder mounting portion 27e is provided on the base end side of the intermediate point C of the arm body 27d, and the work device cylinder mounting portion 27f is provided on the distal end side of the intermediate point C. It has been.

The working device 28 is attached to the tip of the arm body 27d so as to be rotatable about a horizontal axis J3. Further, the working device 28 is connected to the link mechanism 33 so as to be rotatable around a horizontal axis J4 positioned above the horizontal axis J3 in the folded posture. Further, the link mechanism 33 is connected to one end (rod side) of the working device cylinder 32 so as to be rotatable about the horizontal axis J5. The horizontal axis J5 is positioned above the arm body 27d in the folded posture. Therefore, the working device 28 and the link mechanism 33 are located above the arm main body 27d in the folded posture. In other words, in the folded state, the work device cylinder 32 and the link mechanism 33 (hereinafter sometimes referred to as a work device cylinder mechanism) are disposed in the arm distal end side space S1 (see FIG. 2). Thereby, it can suppress that a working device cylinder mechanism is damaged by contact with the ground or a loading platform. Further, by disposing the working device cylinder mechanism on the upper surface side of the arm main body 27d, the tip side portion of the arm main body 27d can be brought close to the ground, that is, the entire arm 27 can be made almost horizontal. For this reason, as described above, the ground contact portion 27a can be formed over a long range substantially over the entire length of the arm, and the arm tip side space S1 can be made large enough to install the working device cylinder mechanism. Become.

Furthermore, the following effects can be obtained by arranging the working device cylinder mechanism on the upper surface side of the arm main body 27d in the attachment folded state.

(1) Compared with the case where the work device cylinder mechanism is disposed on the lower surface side of the arm body 27d, the movement of the work device 28 due to the expansion and contraction of the work device cylinder 32 is reversed. Therefore, the excavation force when using a bucket as the working device 28 is reduced, but the holding force (force for pushing the crushing device upward) when using the crushing device shown in the figure is improved. A dismantling machine having an ultra-long attachment is advantageous in this respect because the work using this holding force is overwhelmingly large.

(2) The hydraulic piping for the working device cylinder mechanism and the working device cylinder 32 can be protected from dismantling.

(3) At the time of work, the work device cylinder mechanism is easy to see from the operator who has boarded the base machine. Therefore, it becomes easy to avoid the contact between the work device cylinder mechanism and the dismantling object and the stroke end work of the work device cylinder 32.

Note that hydraulic piping (not shown) for the work device cylinder 32 is routed on the upper surface side (or a side surface) of the arm main body 27d in the attachment folded state in accordance with the work device cylinder mechanism.

FIG. 3 shows a case where the work device cylinder 32 is transported in a state slightly longer than the minimum contraction. FIG. 4 shows a case where the work device cylinder 32 is transported in the most contracted state. The state of the working device cylinder 32 at the time of transportation may be either the state shown in FIG. 3 or the state shown in FIG. Specifically, in the state shown in FIG. 3, it is necessary to tilt the front boom 25b slightly upward toward the boom base end side in order to avoid interference between the work device cylinder mechanism and the front boom 25b. Slightly increases. On the other hand, in the state shown in FIG. 4, since the front boom 25b can be made substantially horizontal, the effect of reducing the total height of the attachment is enhanced.

In this embodiment, compared with the prior art shown in FIGS. 5 to 7, the distance between the boom 25 and the arm 27 in the folded state can be shortened, and the overall height H1 of the work attachment 24 can be lowered.

Specifically, in the dismantling machine of FIGS. 5 to 7, the inter boom cylinder 10 and the arm cylinder 11 are arranged in the same phase (the same position in the width direction of the work attachment 4). Therefore, it is necessary to maintain an interval between the cylinders 10 and 11 so that they do not interfere with each other. Therefore, the occupied space in the height direction of both cylinders 10 and 11 is large.

As shown in FIG. 7, the attachment point of the boom 5 to the inter boom 6 is X1, the attachment point of the arm 7 to the inter boom 6 is X2, and the attachment point of the inter boom cylinder 10 to the inter boom 6 is Y1. The attachment point of the arm cylinder 11 with respect to 6 (the point of action of the cylinder thrust) is Y2. In this case, the force for operating the inter boom 6 and the arm 7 is proportional to the distance α1 between X1 and Y1 and the distance α2 between X2 and Y2 (hereinafter, α1 and α2 are referred to as moment lengths). Therefore, the moment lengths α1 and α2 need to have a certain size in order to secure the necessary operating force.

As a result, in the conventional dismantling machine, the distance between the boom 5 and the arm 7 in the folded posture (the required length of the inter boom 6) is increased, which is one of the causes for increasing the overall height H1 of the work attachment 4. It was. On the other hand, in the dismantling machine according to the present embodiment, in the folded position, the attachment point A of the inter boom cylinder 30 with respect to the inter boom 26 is disposed below the attachment point B of the arm cylinder 31 with respect to the inter boom 26. The attachment points A and B are displaced in the width direction of the inter boom 26. More specifically, one inter boom cylinder 30 includes a boom 25 (front boom 25b) and an intermediate portion (attachment point A) in the height direction of the inter boom 26 at the center in the width direction of the boom 25 and the inter boom 26. ) Is installed between. Thereby, both the

cylinders

30 and 31 are provided in the state which mutually shifted the phase and cross | intersected X shape by side view.

According to this configuration, as shown in FIGS. 5 to 7, the required moment lengths β1 and β2 (the moment length of the prior art) are compared with the known technique in which both cylinders 10 and 11 are vertically separated in the same phase. It is possible to reduce the occupied space in the height direction of both

cylinders

30 and 31 while securing (equal to or higher than α1 and α2).

As a result, the distance between the boom 25 and the arm 27 (required length of the inter boom 26) in the folded posture can be reduced, so that the total height H1 of the attachment is further reduced, and the safety and workability of the disassembly or assembly work are further improved. Can be made.

Also, since the overall height during attachment transportation can be reduced, truck transportation that was not possible with known technology becomes possible if weight restrictions are cleared. Thereby, while being able to implement | achieve cost reduction, the stability at the time of transportation can be improved because the gravity center of the work attachment 24 can be made low.

In this case, there are the following effects as a synergistic effect with the convex shape of the arm upper surface in the folded state. Specifically, the inter boom cylinder 30 and the arm cylinder 31 can be easily installed by securing the arm base end side space S2 while keeping the overall height of the work attachment 24 low.

As another mode of shifting the inter boom cylinder 30 and the arm cylinder 31 in the width direction, the attachment point B of the arm cylinder 31 with respect to the inter boom 26 and the connection point of the boom 25 with respect to the inter boom 26 are at the same position. It may be set.

Further, by providing one each of the inter boom cylinder 30 and the arm cylinder 31 and attaching links to the inter boom cylinder 30 and the arm cylinder 31, the same effects as in the above embodiment can be obtained. Specifically, the links are attached so as to be displaced from each other in the width direction of the inter boom 26 and intersect in an X shape when viewed from the side. And the front-end | tip part of both links is attached to the inter boom 26 as the said attachment points A and B. As shown in FIG. In this way, the inter-boom cylinder 30 and the arm cylinder 31 are arranged in the same phase, and the links attached to both the

cylinders

30 and 31 are crossed, so that the distance between the boom 25 and the arm 27 is increased. Can be shortened.

As described above, in the above-described embodiment, the grounding portion 27a that can be grounded is provided as at least a part of the lower surface of the arm 27 in the folded state over a length range sufficient to support the entire work attachment 24. It has been. Therefore, the entire work attachment 24 can be sufficiently stably supported by the grounding portion 27a during disassembly, assembly, and transportation.

Thereby, it is possible to omit the stand that has been conventionally used to support the work attachment 24, or to replace it with a complementary simple or small one. Therefore, it is possible to eliminate the raising due to the stand or reduce the raising so that the total height H2 of the work attachment 24 is lowered, and the workability, safety and transportability of the disassembly and assembly work can be improved. Further, the cost and handling of the work attachment 24 is advantageous.

In the embodiment, the working device cylinder 32 and the link mechanism 33 are arranged on the upper surface side of the arm 27 in the folded state. Therefore, the possibility that the working device cylinder mechanism is damaged due to contact with the ground can be reduced, and the tip of the arm 27 can be brought close to the ground, that is, the entire arm 27 can be brought close to the horizontal. For this reason, the ground contact portion 27a can be formed over a long range, and the arm tip side space S1 can be made large enough to install the work device cylinder mechanism.

In the above embodiment, the ground contact portion 27a is formed over substantially the entire length of the arm. Therefore, effects such as an improvement in the stability of the work attachment 24 supported in the folded state and a reduction in the overall height H2 of the work attachment 24 become higher.

In the above-described embodiment, the base-side inclined surface 27g and the distal-side inclined surface 27h are provided at both ends of the arm 27. Therefore, it is possible to reduce the weight and cost by reducing the necessary materials at both ends of the arm 27 while ensuring the necessary strength by the large cross-sectional area of the arm 27 in the range where the grounding portion 27a is provided. Can do.

In the above embodiment, the upper surface (inclined surface 27b) on the distal end side of the arm body 27d is inclined downward toward the distal end of the arm body 27d. Therefore, the arm tip side space S1 is further expanded, and the installation of the working device cylinder mechanism is easier.

In the above-described embodiment, the upper surface of the arm body 27d is formed in a convex shape having the highest midpoint in a side view so that the cross-sectional area of the arm body 27d is maximized at the midpoint C in the length direction of the arm 27. ing. Therefore, the cross-sectional area of the arm main body 27d can be secured at the intermediate point C, and the strength can be maintained.

Further, in the above embodiment, the arm base end side space S2 formed between the base end portion of the arm 27 with respect to the intermediate point C and the boom 25 can be widened. Therefore, the inter boom cylinder 30 and the arm cylinder 31 can be installed without difficulty.

In the above embodiment, the

inclined surfaces

27b and 27c are formed on the distal end side and the proximal end side of the intermediate point C, respectively. Therefore, the cross-sectional area of the arm main body 27d can be gradually changed from the intermediate point C toward the distal end side and the proximal end side. Therefore, the cross-sectional area of the arm main body 27d can be effectively ensured at the intermediate point C as compared with the case where the entire upper surface of the arm main body 27d is inclined downward. Further, as compared with the case where the cross-sectional area of the arm main body 27d is rapidly changed from the intermediate point C to the front end side and the base end side, it is possible to suppress the local stress concentration in the arm main body 27d.

In the above embodiment, the arm cylinder mounting portion 27e is provided on the base end side of the intermediate point C of the arm main body 27d, and the work device cylinder mounting portion 27f is provided on the distal end side of the intermediate point C of the arm main body 27d. It has been. Therefore, the arm front end side space S1 and the arm base end side space S2 that are widely secured by forming the upper surface of the arm body 27d in a convex shape are used as mounting spaces for the inter boom cylinder 30, the arm cylinder 31, and the work device cylinder 32. It can be used effectively.

In the above embodiment, the

cylinders

30 and 31 are connected to the inter boom 26 so that the attachment point A is located below the attachment point B and the attachment points A and B are displaced in the width direction of the inter boom 26. Installed on. Therefore, compared with the prior art in which both

cylinders

30 and 31 are arranged in the same phase (the same position in the attachment width direction when viewed from the top in the folded state), the

cylinders

30 and 31 have the same moment length. The occupied space in the height direction can be reduced.

Thereby, the distance between the boom 25 and the arm 27 in the folded state (required length of the inter boom 26) can be reduced. Therefore, the overall height H2 of the work attachment 24 can be further reduced, so that the safety and workability of the disassembly and assembly work and the transportability of the work attachment 24 can be further improved.

Here, if the

inclined surfaces

27b and 27c are provided on the distal end side and the proximal end side of the intermediate point C of the arm 27 as described above, the arm proximal end side space while keeping the overall height H2 of the work attachment 24 low. The inter boom cylinder 30 and the arm cylinder 31 can be easily installed with S2 secured.

In the above embodiment, the ground contact portion 27a is formed on the lower surface of the arm main body 27d except for the

inclined surfaces

27g and 27h. However, at least the arm main body from the arm cylinder mounting portion 27e to the work device cylinder mounting portion 27f is used. It only needs to be formed over a length range of 27d. In this way, the space below the arm body 27d secured by disposing the inter boom cylinder 30, the arm cylinder 31, and the work device cylinder 32 on the arm body 27d in the folded state is used. The grounding portion 27a can be formed over a sufficient range.

Other Embodiments (1) The grounding portion 27a is preferably formed over substantially the entire length of the arm body 27d as in the above-described embodiment in terms of the stability of the support of the work attachment 24, but is not limited thereto. For example, the working attachment 24 may be formed in a shorter range than the above-described embodiment as long as it includes a portion directly below the center of gravity in the folded state and can secure a sufficient length range to support the entire work attachment 24.

(2) A grounding bracket may be provided at a plurality of locations in the length direction of the arm 27 on the lower surface side of the arm body 27d in a folded state. In this way, the arm 27 can be stably supported even if there is some unevenness on the grounding surface, and damage or paint stripping due to direct grounding of the lower surface of the arm body 27d can be prevented.

(3) In the above embodiment, in order to reduce the overall height H2 of the work attachment 24 in the folded state, the attachment point A of the inter boom cylinder 30 is made lower than the attachment point B of the arm cylinder 31, and both attachment points A, Although B is displaced in the width direction, it is not limited to this. Specifically, both

cylinders

30 and 31 may be arranged one above the other in the same phase as in the known technique shown in FIGS.

Even in this case, the work attachment 24 in the folded state can be stably supported by omitting the stand or by a simple or small stand. Therefore, the basic effect of lowering the overall height H2 of the work attachment 24 can be ensured by omitting or simplifying the cradle and arranging the entire arm 27 close to the horizontal.

(4) The present invention can be applied not only to a dismantling machine, but also to an excavator with a bucket attached to the tip of an attachment or a crusher with a breaker attached as a working device.

The specific embodiments described above mainly include inventions having the following configurations.

The present invention is a work attachment that can be attached to a base machine of a work machine, and is a boom that is attached to the base machine so that it can be raised and lowered, and an inter boom that is attached to the tip of the boom so as to be rotatable around a horizontal axis. An arm having a base end portion attached to the tip of the inter boom so as to be rotatable about a horizontal axis, a working device attached to the tip of the arm, and a boom cylinder for raising and lowering the boom; An inter boom cylinder that is provided between the boom and the inter boom and rotates the inter boom, and an arm cylinder that is provided between the inter boom and the arm and rotates the arm. A working device cylinder for rotating the working device, the working device and the working device cylinder, A link mechanism provided therebetween, and the boom, the inter boom and the arm are folded in three by the contraction of the inter boom cylinder and the arm cylinder, and the boom falls down When the arm is grounded, the boom can be folded into a folded state with the interboom as a boundary, and the arm can be folded down, and is long enough to support the entire work attachment in the folded state. The working device cylinder and the link mechanism are provided on the upper surface side of the tip of the arm in the folded state so that a grounding portion that can be grounded over a range is formed in the arm, and the interface The boom cylinder and the arm cylinder have a base end portion of the arm in the folded state. And a surface side, to provide a working attachment.

In the present invention, in the folded state, the arm is provided with a grounding portion that can be grounded over a length range sufficient to support the entire work attachment. Therefore, the entire work attachment can be sufficiently stably supported by this grounding portion during disassembly, assembly, and transportation.

This makes it possible to omit the pedestal conventionally used to support the work attachment or to replace it with a complementary simple or small one. For this reason, the height of the work attachment can be lowered by eliminating or raising the height by the stand, and improving the workability, safety and transportability of the disassembly and assembly work. Furthermore, the cost and handling of the work attachment is advantageous.

In the present invention, the working device cylinder and the link mechanism (hereinafter, both may be referred to as the working device cylinder mechanism) are arranged on the upper surface side of the arm in the folded state. Therefore, the possibility that the working device cylinder mechanism is damaged due to contact with the ground can be reduced, and the tip of the arm can be brought closer to the ground, that is, the entire arm can be brought closer to the horizontal.

Therefore, the grounding portion can be formed over a long range, and the space on the upper surface side of the arm can be made large enough to install the working device cylinder mechanism.

Specifically, the working device cylinder and the link mechanism can be disposed between the tip of the arm and the boom in the folded state.

In the work attachment, the grounding portion is preferably a flat surface formed on the arm.

Thus, since the grounding portion is a flat surface, the work attachment can be supported more stably.

In the work attachment, the grounding portion is preferably formed over substantially the entire length of the arm.

In this aspect, the grounding portion is formed over almost the entire length of the arm. For this reason, the effects of improving the stability of the work attachment supported in the folded state and reducing the total height of the work attachment become higher.

In the working attachment, the arm includes an arm cylinder mounting portion to which one end of the arm cylinder is attached, and a working device cylinder mounting portion to which one end of the working device cylinder is attached. It is preferable that it is formed over the length range of the arm from the arm cylinder mounting portion to the work device cylinder mounting portion.

In the above aspect, the grounding portion is formed over at least the length of the arm from the arm cylinder mounting portion to the work device cylinder mounting portion. Therefore, the grounding portion can be formed over a sufficient range using the space below the arm secured by disposing the arm cylinder and the working device cylinder on the arm in the folded state.

In the work attachment, it is preferable that the upper surface on the distal end side of the arm in the folded state is an inclined surface that descends toward the distal end of the arm.

In this aspect, the upper surface on the tip side of the arm is inclined downward toward the tip of the arm. Therefore, the arm tip side space further expands and the installation of the working device cylinder mechanism becomes easier.

In the work attachment, the upper surface of the arm in the folded state is convex so that the intermediate point is the highest in a side view so that the cross-sectional area of the arm is maximized at the intermediate point in the length direction of the arm. Preferably it is formed.

In this aspect, the upper surface of the arm is formed in a convex shape having the highest midpoint in a side view so that the cross-sectional area of the arm is maximized at the midpoint in the arm length direction. Therefore, the cross-sectional area of the arm can be secured at the intermediate point, and the strength can be maintained.

In the above aspect, the space formed between the base end portion of the arm and the boom (hereinafter referred to as the arm base end space) can be widened. Therefore, the inter boom cylinder and the arm cylinder can be installed without difficulty.

Incidentally, when the upper surface of the arm is inclined downward, if the entire upper surface of the arm is inclined downward, the cross-sectional area of the arm may be insufficient, leading to a decrease in strength.

Therefore, in the work attachment, a portion of the upper surface of the arm in the folded state that is on the tip side of the intermediate point is an inclined surface that descends toward the tip of the arm, and the arm in the folded state. It is preferable that the base end side portion of the upper surface with respect to the intermediate point is an inclined surface that descends toward the base end of the arm.

In this aspect, inclined surfaces are respectively formed on the distal end side and the proximal end side of the intermediate point. Therefore, the cross-sectional area of the arm can be gradually changed from the intermediate point toward the distal end side and the proximal end side. Therefore, compared with the case where the entire upper surface of the arm is inclined downward, the cross-sectional area of the arm can be effectively ensured at the intermediate point. Moreover, compared with the case where the cross-sectional area of the arm is suddenly changed from the intermediate point to the distal end side and the proximal end side, local stress concentration can be suppressed from occurring in the arm.

In the work attachment, the arm has an upper surface formed in a convex shape so that the intermediate point is the highest in a side view in the folded state so that the cross-sectional area becomes maximum at the intermediate point in the length direction. A main body, an arm cylinder mounting portion provided on one end side of the upper surface of the arm main body, the arm cylinder mounting portion to which one end of the arm cylinder is attached, and a front end side of the intermediate point on the upper surface of the arm main body; It is preferable to provide a working device cylinder mounting portion provided with one end of the working device cylinder.

In this aspect, the arm cylinder mounting portion is provided on the proximal side of the intermediate point of the arm main body, and the work device cylinder mounting portion is provided on the distal end side of the intermediate point of the arm main body. Therefore, the arm base end side space and the arm tip end side space that are widely secured by forming the upper surface of the arm in a convex shape can be effectively utilized as the mounting space for the arm cylinder and the work device cylinder.

In the work attachment, in the folded state, a first attachment point of the inter boom cylinder with respect to the inter boom is positioned below a second attachment point of the arm cylinder with respect to the inter boom, and the first attachment It is preferable that the inter boom cylinder and the arm cylinder are attached to the inter boom so that the point and the second attachment point are displaced from each other in the width direction of the inter boom.

In the above aspect, both cylinders are attached to the inter-boom so that the first attachment point is located below the second attachment point and the two attachment points are displaced in the width direction of the inter-boom. Therefore, compared to the conventional technology in which both cylinders are placed in the same phase (the same position in the attachment width direction when viewed from the top in the folded state), the occupied space in the height direction of both cylinders is ensured while ensuring the same moment length. Can be reduced.

This makes it possible to reduce the distance between the boom and the arm in the folded state (the required length of the inter boom). Therefore, the overall height of the work attachment can be further reduced, so that the safety and workability of the disassembly and assembly work and the transportability of the work attachment can be further improved.

Here, as described above, if the inclined surfaces are provided on the distal end side and the proximal end side of the intermediate point of the arm, the arm boom end side space is secured while the overall height of the work attachment is kept low, the inter boom cylinder, In addition, the arm cylinder can be easily installed.

According to the present invention, it is possible to provide a work attachment that can be stably supported in a folded state and that can prevent breakage of the work device cylinder and the link mechanism, and a work machine including the work attachment.

A Mounting point (1st mounting point)
B Mounting point (second mounting point)
C Intermediate point H2 Attachment total height J1 to J5 Horizontal axis S1 Arm tip side space S2 Arm base end side space 23 Base machine 24 Work attachment 25 Boom 25b2 Interboom cylinder mounting part 26 Interboom 27 Arm

27a Grounding part

27b, 27c Inclined surface 27d Arm body 27e Arm cylinder mounting portion 27f Work device cylinder mounting portion 27g Base end side inclined surface 27h Front end side inclined surface 28 Work device 29 Boom cylinder 30 Inter boom cylinder 31 Arm cylinder 32 Work device cylinder 33 Link mechanism 34 Transport vehicle

Claims

A work attachment that can be attached to a base machine of a work machine,
A boom attached to the base machine in a undulating manner;
An inter boom attached to the end of the boom so as to be rotatable about a horizontal axis;
An arm having a base end rotatably attached to the tip of the interboom about a horizontal axis;
A working device attached to the tip of the arm;
A boom cylinder for raising and lowering the boom;
An inter boom cylinder that is provided between the boom and the inter boom and rotates the inter boom;
An arm cylinder which is provided between the inter boom and the arm and rotates the arm;
A working device cylinder for rotating the working device;
A link mechanism provided between the working device and the working device cylinder;
The boom, the inter boom, and the arm are folded in three by the contraction of the inter boom cylinder and the arm cylinder, and the boom is laid down and the arm is grounded. Can be folded into a folded state with the boom on the upper side and the arm on the lower side,
The working device cylinder and the link mechanism are in the folded state so that a grounding portion capable of grounding is formed on the arm over a length range sufficient to support the entire work attachment in the folded state. And the inter boom cylinder and the arm cylinder are provided on the upper surface side of the base end portion of the arm in the folded state.
The work attachment according to claim 1, wherein the work device cylinder and the link mechanism are arranged between a tip portion of the arm and the boom in the folded state.
The work attachment according to claim 1 or 2, wherein the grounding portion is a flat surface formed on the arm.
The work attachment according to any one of claims 1 to 3, wherein the grounding portion is formed over substantially the entire length of the arm.
The arm has an arm cylinder attachment portion to which one end of the arm cylinder is attached, and a work device cylinder attachment portion to which one end of the work device cylinder is attached,
The work attachment according to any one of claims 1 to 4, wherein the grounding portion is formed over at least a length range of the arm from the arm cylinder attachment portion to the work device cylinder attachment portion.
The work attachment according to any one of claims 1 to 5, wherein an upper surface on a tip side of the arm in the folded state is an inclined surface that descends toward the tip of the arm.
The upper surface of the arm in the folded state is formed in a convex shape having the highest intermediate point in a side view so that the cross-sectional area of the arm is maximized at the intermediate point in the length direction of the arm. The work attachment according to claim 6.
The portion of the upper surface of the arm in the folded state that is on the tip side of the intermediate point is an inclined surface that descends toward the tip of the arm,
The work attachment according to claim 7, wherein a portion of the upper surface of the arm in the folded state that is closer to the base end side than the intermediate point is an inclined surface that descends toward the base end of the arm.
The arm has an arm body having a convex upper surface with the intermediate point being the highest in a side view in the folded state so that the cross-sectional area is maximum at the intermediate point in the length direction, and the arm An arm cylinder mounting portion provided at a base end side with respect to the intermediate point on the upper surface of the main body, to which one end of the arm cylinder is attached, and provided at a distal end side with respect to the intermediate point on the upper surface of the arm main body; The work attachment according to any one of claims 1 to 5, further comprising a work device cylinder mounting portion to which one end of the device cylinder is attached.
In the folded state, a first attachment point of the inter boom cylinder with respect to the inter boom is located below a second attachment point of the arm cylinder with respect to the inter boom, and the first attachment point and the second attachment point The work attachment according to any one of claims 1 to 9, wherein the inter-boom cylinder and the arm cylinder are attached to the inter-boom so that the points are displaced from each other in the width direction of the inter-boom.
A base machine,
A work machine comprising the work attachment according to any one of claims 1 to 10, which is attached to the base machine so as to be raised and lowered.