WO2013014898A1

WO2013014898A1 - Working machine

Info

Publication number: WO2013014898A1
Application number: PCT/JP2012/004633
Authority: WO
Inventors: 崇伸中村; 泰志重成
Original assignee: コベルコ建機株式会社
Priority date: 2011-07-27
Filing date: 2012-07-20
Publication date: 2013-01-31
Also published as: JP2013028913A; JP5708346B2

Abstract

Provided is a working machine whereby the height dimension of an attachment when the attachment is being conveyed while in a folded position can be reduced and conveyance performance can be improved, and also whereby work to assemble or disassemble the attachment in an attachment elongated position can be easily carried out. An inter-boom cylinder (30) is rotatably coupled to an inter-boom (26) by a first attachment pin (40a), and an arm cylinder (31) is rotatably coupled to the inter-boom (26) by a second attachment pin (40b). The inter-boom cylinder (30) and the arm cylinder (31) intersect when viewed from the side of the attachment in a state where the work attachment (24) has been folded on the ground in a triple fold. In the attachment elongated state, the first attachment pin (40a) and the second attachment pin (40b) are located so that the heads of the first attachment pin (40a) and the second attachment pin (40b) can be seen in their entirety from the side of the attachment, so that each can be connected to or disconnected from the inter-boom (26).

Description

Work machine

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

The background technology will be explained using an example of a dismantling machine with an ultra-long attachment used for dismantling high-rise buildings.

This dismantling machine is composed of a base machine 3 and a work attachment 4 attached to the front part thereof as shown in FIG. The base machine 3 includes a crawler-type lower traveling body 1 and an upper revolving body 2 that is mounted on the lower traveling body 1 so as to be rotatable about a vertical axis.

The work attachment 4 includes a boom 5, a short inter boom 6, an arm 7, and a work device 8. The boom 5 is attached to the base machine 3, specifically, the upper swing body 2 of the base machine 3 so as to be raised and lowered. The inter boom 6 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 of the work attachment 4. The arm 7 is attached to the tip of the inter boom 6 so as to be rotatable about a horizontal axis. The working device 8 is attached to the tip of the arm 7. The working device 8 shown in FIG. 10 is a crusher called a nibler.

The boom 5 includes a main boom 5a and a front boom 5b that is detachably connected to the upper side thereof. When transporting the dismantling machine, it is disassembled into the base machine 3 and the work attachment 4 and transported. At this time, the main boom 5a is transported while being attached to the base machine 3.

The front boom 5b is normally configured by detachably connecting a plurality of stages of boom bodies, but is shown here as a single unit for the sake of simplification of the drawing.

Further, as a cylinder such as a hydraulic cylinder for operating the work attachment 4, a boom cylinder 9 for raising and lowering the boom 5 and the entire attachment including the boom 5, an inter boom cylinder 10 for operating the inter boom 6, and an arm cylinder for operating the arm 7. 11 and a working device cylinder 12 for operating the working device 8 is provided.

The inter boom cylinder 10 and the arm cylinder 11 are provided between the boom 5 (specifically, the front boom 5b of the boom 5) and the inter boom 6 and between the inter boom 6 and the arm 7, respectively, on the front side of the attachment. It has been.

The above configuration is shown in Patent Document 1.

When disassembling such a dismantling machine with an ultra-long attachment, the work attachment 4 as shown in the solid line part of FIG. 10 and the boom 5 is disposed above the inter boom 6, and the arm 7 is Folded in a three-fold state and placed on the ground so as to be arranged below the inter boom 6, the set (group) of the base machine 3 and the main boom 5a and the work attachment 4 excluding the main boom 5a as described above. Separated into groups (groups) and transported.

In this case, the set of work attachments 4 is transported while the entire set is in a folded posture.

Here, in the dismantling machine having the above-described structure, the inter boom cylinder 10 and the arm cylinder 11 are arranged in the same phase (the same position in the attachment width direction when viewed from the top in the attachment folding posture). It is necessary to maintain an interval between the

cylinders

10 and 11 so that they do not interfere with each other.

For this reason, the occupied space in the height direction of these two

cylinders

10 and 11 becomes large.

On the other hand, as shown in FIG. 11, the mounting pins of the boom 5 and the arm 7 with respect to the inter boom 6 are X1 and X2, and the mounting pins of the two

cylinders

10 and 11 with respect to the inter boom 6 (the point of action of the cylinder thrust) are Y1. , Y2, the force that operates the inter boom 6 and the arm 7 is proportional to the distance between the X1 and Y1 and the distance between the X2 and Y2 (hereinafter referred to as moment length) α1 and α2. Above, the moment lengths α1 and α2 need to have a certain size.

As a result, the distance between the boom 5 and the arm 7 in the attachment folding posture, that is, the length L1 of the inter boom 6 is increased, so that the ground height of the work attachment 4 (that is, the tip height H1 of the work attachment 4). And the overall height H2) of the work attachment 4 is increased.

For this reason, the disassembly and assembly work of the work attachment 4 is a work at a high place, which is not preferable in terms of safety and workability.

Here, the moment length for securing the operating force necessary to operate the inter boom 6 and the arm 7 as described above can be secured, and the height dimension of the attachment in the attachment folding posture (so-called transport height) In order to lower the height, it can be considered that the inter boom cylinder 10 and the arm cylinder 11 are arranged so as to intersect each other when viewed from the side of the attachment in the attachment folding posture. In that case, when disassembling or assembling the work attachment with the attachment extended posture, the mounting pins connecting each cylinder and the inter boom may interfere with surrounding cylinders, etc. It becomes difficult.

JP 2007-203221 A

The object of the present invention is to improve the transportability by reducing the height of the attachment during transportation in the attachment folded posture, and to easily disassemble or assemble the attachment in the attachment extended posture. Is to provide.

The present invention is a work machine, wherein the work machine is configured by attaching a work attachment to a base machine, and the work attachment includes a boom attached to the base machine in a undulating manner, and a tip of the boom An inter-boom pivotally mounted around a horizontal axis, an arm pivotably mounted around the horizontal axis at the tip of the inter-boom, a working device attached to the tip of the arm, and the boom A boom cylinder for raising and lowering, and at least a front side of the work attachment in a state where the work attachment is extended and started, and between the boom and the interboom, and at least rotates the interboom. Extends one inter boom cylinder and the work attachment At least one arm cylinder which is provided on the front side of the work attachment in a state where the work boom is raised and which is provided between the inter boom and the arm and which operates the arm, and the inter boom cylinder is horizontally mounted on the inter boom. A first mounting pin that is pivotably connected about an axis and is mounted so that it can move horizontally and be inserted into and removed from the interboom, and the arm cylinder is rotatably connected to the interboom about a horizontal axis. And a second mounting pin mounted so as to move in the horizontal direction so that it can be inserted into and removed from the inter-boom. The first mounting pin and the second mounting pin have the boom mounted on the inter-boom. Placed on the upper side and the arm is placed on the lower side of the inter boom. When the attachment is folded in a three-fold manner, the second mounting pin is connected to the first mounting so that the inter boom cylinder and the arm cylinder intersect each other when viewed from the side of the attachment. The first attachment pin and the second attachment are located when the attachment is in an attachment extended position so that the boom, the inter-boom, and the arm extend in a substantially linear shape. The operation is characterized in that the pins are arranged so that the entire heads of the first mounting pin and the second mounting pin can be seen from the side surface of the attachment so that the pins can be respectively inserted into and removed from the inter boom. It is a machine.

It is a schematic side view of the folding state of the dismantling machine with a super-long attachment which concerns on embodiment of the working machine of this invention. It is a side view of the folding state of the work attachment of FIG. FIG. 2 is an enlarged side view of the vicinity of an inter boom in the extended state of the work attachment of FIG. 1. FIG. 2 is an enlarged plan view of the vicinity of an inter boom in the extended state of the work attachment of FIG. 1. FIG. 2 is an enlarged bottom view of the vicinity of an inter boom in the extended state of the work attachment of FIG. 1. FIG. 10 is an enlarged side view of the periphery of an inter boom in a folded state of a work attachment according to another embodiment of the work machine of the present invention. FIG. 7 is an enlarged side view of the vicinity of the inter boom in the extended state of the work attachment of FIG. 6. FIG. 7 is an enlarged plan view of the vicinity of the inter boom in the extended state of the work attachment of FIG. 6. FIG. 7 is an enlarged bottom view around the inter boom in the extended state of the work attachment of FIG. 6. It is a schematic side view which shows the conventional demolition machine. FIG. 11 is a partially enlarged view of FIG. 10.

In the following embodiment, as an embodiment of the working machine of the present invention, a dismantling machine with an ultralong attachment is applied as an application subject to the description of the background art.

The dismantling machine of the present embodiment includes a base machine 23 and a work attachment 24 as shown in FIGS. The base machine 23 includes 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. The work attachment 24 is attached to the front part of the base machine 23.

The work attachment 24 includes a boom 25, a short inter boom 26, an arm 27, and a work device (not shown). The boom 25 is attached to the base machine 23, specifically, the upper swing body 22 so as to be raised and lowered. The boom 25 includes a main boom 25a, a front boom 25b, and an insert boom 25c. The heel inter boom 26 is attached to the front end portion 25b2 of the front boom 25b so as to be rotatable in the vertical direction. The arm 27 has a rear end 27b attached to the front end of the inter boom 26 so as to be rotatable in the vertical direction. A working device (not shown) is attached to the tip of this arm 27. As the working device, for example, a nibbler (reference numeral 8 in FIG. 10) or the like is used.

In addition, the work attachment 24 includes a boom cylinder 29 for raising and lowering the boom 25 and the entire attachment including the boom 25, an inter boom cylinder 30 for operating the inter boom 26, and an arm 27 as cylinders for operating the work attachment 24. Are provided with an arm cylinder 31 for actuating and a work device cylinder 32 for actuating a work device (not shown).

Further, the inter-boom cylinder 30 and the arm cylinder 31 each have a boom 25 (specifically, on the front side of the attachment (that is, the front side of the attachment in a state where the attachment is extended and started as shown in FIG. 10). The front boom 25b) of the boom 25 is connected to the inter boom 26, and the inter boom 26 and the arm 27 are rotatably connected by mounting pins 40a to 40d described later.

As shown in FIGS. 1 and 2, when the work attachment 24 is folded and transported, the boom 25 is disposed above the inter boom 26 and the arm 27 is disposed below the inter boom 26. As shown, the work attachment 24 is folded in a three-fold state and placed on the ground, and a set (group) of the base machine 23 and the main boom 25a, and a set (group) of the work attachment 24 excluding the main boom 25a, It is transported separately from the insert boom 25c. After the work attachment 24 is transported, it is assembled so as to be in the same state as before transport.

The above configuration is almost the same as the known demolition machine shown in FIGS.

However, the dismantling machine of the present embodiment includes two inter boom cylinders 30 and one arm cylinder 31, and these two

cylinders

30 and 31 are arranged as follows by means of mounting pins 40a to 40d. It is different in point.

4 and 5, the two inter boom cylinders 30 are separated from each other in the width direction of the inter boom 26, and are connected to the inter boom 26 by first mounting pins 40a described later. Further, as shown in FIG. 5, one arm cylinder 31 is sandwiched between two inter boom cylinders 30, and a projection 26a (see FIG. 3) of the inter boom 26 by a second mounting pin 40b described later. Reference).

As shown in FIGS. 1 to 4, the first mounting pin 40a connects one end 30a of the inter boom cylinder 30 to the inter boom 26 so as to be rotatable about a horizontal axis. The first mounting pin 40a is mounted so as to move in the horizontal direction and be inserted / removed at a position closer to the front of the inter boom 26 (left side in FIG. 3).

The second mounting pin 40b connects one end 31a of the arm cylinder 31 to a protrusion 26a that protrudes downward from a position near the rear of the inter boom 26 (right side in FIG. 3) so as to be rotatable about a horizontal axis. ing. The second mounting pin 40b is mounted so as to move in the horizontal direction so as to be close to the rear of the inter boom 26 and at a position below the first mounting pin 40a.

The third mounting pin 40c connects the other end 30b of the inter boom cylinder 30 to a mounting portion 25b1 protruding from the peripheral surface of the front boom 25b so as to be rotatable about a horizontal axis. The third mounting pin 40c is mounted so as to move in the horizontal direction and be inserted into and removed from the front boom 25b.

The fourth mounting pin 40d connects the other end 31b of the arm cylinder 31 to a mounting portion 27a protruding from the peripheral surface of the arm 27 so as to be rotatable about a horizontal axis. The fourth mounting pin 40d is mounted so as to move in the horizontal direction and be inserted into and removed from the arm 27.

As shown in FIGS. 1 and 2, the work attachment 24 is folded in three so that the front boom 25b is disposed on the upper side of the inter boom 26 and the arm 27 is disposed on the lower side of the inter boom 26. When the folded attachment position is reached, the second attachment pin 40b is disposed above the first attachment pin 40a when viewed from the side of the attachment. At the same time, the inter boom cylinder 30 and the arm cylinder 31 are arranged so as to cross each other.

On the other hand, as shown in FIG. 3, the work attachment 24 is in a posture in which the work attachment 24 extends in the horizontal direction so that the front boom 25b, the inter boom 26, and the arm 27 extend substantially linearly. Sometimes, the first mounting pin 40a and the second mounting pin 40b can be seen from the side of the work attachment 24 so that the entire heads of the first mounting pin 40a and the second mounting pin 40b can be seen from the inter-boom 26, respectively. It arranges so that it may become a position. Specifically, since the protruding portion 26a provided at a position closer to the rear of the inter boom 26 protrudes downward from between the two arm cylinders 30, the first mounting pin 40a is more than the second mounting pin 40b. It is arranged on the front side in the extension direction of the attachment and on the upper side of the second mounting pin 40b.

Thereby, the first mounting pin 40a can be easily inserted into and removed from the inter boom 26 without being interfered with the second mounting pin 40b and the arm cylinder 31 around the first mounting pin 40a. Further, in the posture in which the attachment is extended in the horizontal direction, the protruding portion 26a of the inter boom 26 protrudes downward from the first mounting pin 40a, so the second mounting pin 40b attached to the protruding portion 26 is It can be easily inserted into and removed from the inter boom 26 without interference with the first mounting pins 40a and the arm cylinders 30 arranged on both sides of the projecting portion 26. Moreover, since the 1st attachment pin 40a is arrange | positioned in the extension direction of the attachment rather than the 2nd attachment pin 40b, the stroke length of the inter boom cylinder 30 and the arm cylinder 31 is securable.

As shown in FIG. 3, the position of the first mounting pin 40 a where the two inter boom cylinders 30 and the inter boom 26 are connected is the second position where the one arm cylinder 31 and the inter boom 26 are connected. The height H is set higher than the position of the mounting pin 40b. The height H is set to such a height that the second mounting pin 40b positioned between the two inter boom cylinders 30 can be easily attached and detached without interfering with the two inter boom cylinders 30.

(Features of this embodiment)
(1)
In the work machine of the present embodiment configured as described above, as shown in FIGS. 1 and 2, the inter-boom cylinder 30 and the arm cylinder 31 are arranged so as to cross each other in the attachment folding posture. In comparison, the occupied space in the height direction of these two

cylinders

30 and 31 can be reduced while securing an equivalent moment length.

That is, as shown in FIGS. 10 to 11, these two

cylinders

30, 31 are secured while maintaining the necessary moment length as compared with the known technique in which the two

cylinders

30, 31 are separated from each other in the same phase. The occupied space in the height direction of 30, 31 can be reduced.

Thus, not only the length of the inter boom 26 but also the overall height of the attachment 24 in the folded position can be lowered, and the safety and workability of the disassembly / assembly work can be improved.

Also, since the overall height during attachment transportation can be reduced, truck transportation is facilitated, cost can be reduced, and the attachment center of gravity can be lowered, so that stability during transportation can be improved.

(2)
Moreover, in the working machine of the present embodiment, as shown in FIG. 3, in the extended posture of the work attachment 24 in which the front boom 25 b, the inter boom 26, and the arm 27 extend substantially linearly, the inter boom cylinder 30 and the inter boom 26 and the second mounting pin 40b to which the arm cylinder 31 and the inter boom 26 are connected can be respectively inserted into and removed from the inter boom 26 when viewed from the side of the attachment. The first mounting pin 40a and the second mounting pin 40b are arranged so that the entire heads can be seen. Therefore, when disassembling or assembling the work attachment 24 in the attachment extension posture, the first mounting pin 40a and the second mounting pin 40b or the mounting

pins

40a and 40b and the surrounding

cylinders

30 and 31 interfere with each other. Without doing so, it is possible to easily insert and remove the mounting

pins

40a, 40b connecting the

cylinders

30, 31 and the inter boom 26.

(3)
In the working machine of this embodiment, as shown in FIGS. 3 and 5, the attachment extends in the horizontal direction even if one arm cylinder 31 is arranged between the two inter boom cylinders 30. When viewed from the side of the work attachment 24, the first mounting pin 40 a that connects the two inter boom cylinders 30 to the inter boom 26 is connected to the first boom cylinder 30 that connects the one arm cylinder 31 to the inter boom 26. Since the second mounting pin 40b is disposed on the front side in the extension direction of the attachment and on the upper side of the second mounting pin 40b, the first mounting pin 40a is secured while ensuring the stroke length of each

cylinder

30, 31. And the 2nd attachment pin 40b can be inserted / removed to the inter boom 26, respectively. Therefore, the insertion / removal operation of the second mounting pin 40b for connecting the one intermediate arm cylinder 31 and the inter boom 26 can be easily performed without being interfered with the first mounting pin 40a and the two inter boom cylinders 30. Is possible.

(4)
In this configuration, as shown in FIG. 3, the first mounting pin 40 a that connects the two inter boom cylinders 30 and the inter boom 26 connects the one arm cylinder 31 and the inter boom 26. 2 Arranged above the mounting pin 40b. For this reason, the moment length β1 for the two inter boom cylinders 30 to rotate the inter boom 26 is shorter than the moment length β2 for the one arm cylinder 31 to rotate the inter boom 26. Since the driving force of the inter boom cylinder 30 can be easily set larger than the driving force of the single arm cylinder 31, it is possible to maintain the capacity of the work machine.

(5)
In the working machine of the present embodiment, when the work attachment 24 is extended and the work is performed in the attachment extended posture, the two inter boom cylinders 30 are arranged on the distal end side of the attachment 24 (that is, the work device cylinder 32 and the work device). The one arm cylinder 31 is disposed at a position close to the distal end side of the attachment 24. Thereby, it is possible to suppress the arm cylinder 31 from projecting in the width direction on the tip side of the attachment. As a result, it is possible to reduce the risk of damage to the arm cylinder 31 during work. In addition, since the extension of the arm cylinder 31 in the width direction on the distal end side of the attachment is suppressed, the arm cylinder 31 is not obstructive when an operator sitting in the driver's seat of the work machine looks at the distal end side of the attachment. Improves.

Further, when considering the weight balance of the entire work machine, in the work attachment 24, two inter boom cylinders 30 are disposed on the side closer to the base machine 23, and one arm cylinder 31 is disposed on the side far from the base machine 23. Since the center of gravity of the work attachment 24 can be brought close to the base machine 23, the risk of the work machine falling down can be reduced.

(Modification)
(A)
In the above embodiment, an example in which one arm cylinder 31 is provided between two inter boom cylinders 30 is shown, but the present invention is not limited to this, and two It is also possible to provide a plurality of arm cylinders 31 between the inter boom cylinders 30.

(B)
In the above-described embodiment, the first mounting pin 40a to which the two inter boom cylinders 30 and the inter boom 26 are connected in the posture in which the attachment extends in the horizontal direction includes the single arm cylinder 31 and the inter boom 26. However, the present invention is not limited to this, and the reverse arrangement, that is, as shown in FIGS. The second mounting pin 140b to which the arm cylinder 131 and the inter boom 126 are connected is positioned above the first mounting pin 140a to which the single inter boom cylinder 130 and the inter boom 126 are connected. May be.

That is, as shown in FIGS. 7 to 9, the two arm cylinders 131 are separated from each other in the width direction of the inter boom 126 and are connected to the inter boom 126 by second mounting pins 140b described later. Further, as shown in FIG. 9, one inter boom cylinder 130 is sandwiched between two arm cylinders 131, and a projection 126a (see FIG. 7) of the inter boom 126 by a first mounting pin 140a described later. Reference).

As shown in FIGS. 7 to 9, the first mounting pin 140a has a projecting portion 126a that projects one end portion 130a of the inter boom cylinder 130 downward from a position closer to the front of the inter boom 126 (left side in FIG. 7). Are connected to be rotatable about a horizontal axis. The first attachment pin 140a is attached so that it can move in the horizontal direction and be inserted and removed at a position closer to the front of the inter boom 126.

The second mounting pin 140b connects one end 131a of the arm cylinder 131 to the inter boom 126 so as to be rotatable about a horizontal axis. In a posture in which the attachment extends in the horizontal direction, the second mounting pin 140b moves in the horizontal direction and is closer to the rear of the inter boom 126 (right side in FIG. 7) and above the first mounting pin 140a. It is attached so that it can be inserted and removed at the position.

The third mounting pin 140c connects the other end portion 130b of the inter boom cylinder 130 to a mounting portion 125b1 protruding from the peripheral surface of the front boom 125b so as to be rotatable about a horizontal axis. The third mounting pin 140c is mounted so as to move in the horizontal direction and be inserted into and removed from the front boom 125b.

The fourth mounting pin 140d connects the other end 131b of the arm cylinder 131 to a mounting portion 127a protruding from the peripheral surface of the arm 127 so as to be rotatable about a horizontal axis. The fourth attachment pin 140d is attached so as to move in the horizontal direction and be inserted into and removed from the arm 127.

Thus, even when one inter boom cylinder 130 is arranged between the two arm cylinders 131, as shown in FIG. 7, in the posture in which the attachment extends in the horizontal direction, the first attachment It arrange | positions so that the whole head of the said 1st attachment pin 140a and the said 2nd attachment pin 140b can be seen from the attachment side surface so that the pin 140a and the 2nd attachment pin 140b can each be inserted / removed to the inter boom 126. Specifically, when viewed from the side of the attachment, the second mounting pin 140b that connects the two arm cylinders 131 to the inter boom 126 has one inter boom cylinder in a posture in which the attachment extends in the horizontal direction. The stroke of each of the

cylinders

130 and 131 is arranged so as to be behind the first attachment pin 140a connecting the 130 to the inter boom 126 in the extension direction of the attachment and above the first attachment pin 140a. The first mounting pin 140a and the second mounting pin 140b can be inserted into and removed from the inter boom 126 while securing the length. Therefore, the insertion / removal operation of the first mounting pin 140a that connects the intermediate one inter-boom cylinder 130 and the inter-boom 126 can be easily performed without being interfered with the second mounting pin 140b and the two arm cylinders 131. Is possible.

In this configuration, as shown in FIG. 7, the second mounting pin 140 b that connects the two arm cylinders 131 and the inter boom 126 connects the one inter boom cylinder 130 and the inter boom 126. Since the one arm pin 131 is disposed above the mounting pin 140a, the moment length β4 for the two arm cylinders 131 to rotate the inter boom 126 is the same as that for the single inter boom cylinder 130 to rotate the inter boom 126. Although it becomes shorter than the moment length β3, the driving force of the two arm cylinders 131 can be easily set larger than the driving force of the single inter boom cylinder 130, so that the capability of the work machine can be maintained.

In addition to the configuration in which one inter boom cylinder 130 is provided between the two arm cylinders 131 as described above, a plurality of inter boom cylinders 130 may be provided between the two arm cylinders 131. Is possible.

(C)
In the above embodiment, the dismantling machine has been described as an example of the working machine of the present invention, but the present invention is not limited to this, and a working machine or the like in which a lifting magnet is attached to the tip of the attachment. It can be widely applied to other work machines.

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

The work machine according to the present invention is configured by attaching a work attachment to a base machine, and the work attachment is pivotable about a horizontal axis at a tip of the boom and a boom attached to the base machine. An inter-boom attached to the end of the inter-boom, an arm attached to the tip of the inter-boom so as to be rotatable around a horizontal axis, a working device attached to the tip of the arm, a boom cylinder for raising and lowering the boom, At least one inter boom cylinder provided on the front side of the work attachment in a state where the work attachment is extended and started up, and between the boom and the inter boom, and for rotating the inter boom; When the work attachment is extended and started up At least one arm cylinder provided on the front side of the work attachment and between the inter boom and the arm and operating the arm, and the inter boom cylinder is rotated around the horizontal axis around the inter boom. A first attachment pin that is movably connected and is attached so that it can move in the horizontal direction and be inserted into and removed from the inter boom; and the arm cylinder is connected to the inter boom so as to be rotatable about a horizontal axis; and A second mounting pin that is mounted so as to move in the horizontal direction so that it can be inserted into and removed from the inter boom. The first mounting pin and the second mounting pin have the boom disposed above the inter boom. And the attachment so that the arm is disposed below the inter boom. When the attachment folding position is folded in a three-fold manner, the second mounting pin is more than the first mounting pin so that the inter boom cylinder and the arm cylinder intersect each other when viewed from the side of the attachment. Is located on the upper side, and when the attachment is in the attachment extension posture so that the boom, the inter boom, and the arm extend substantially linearly, the first attachment pin and the second attachment pin are The first mounting pin and the second mounting pin are arranged so that the entire heads of the first mounting pin and the second mounting pin can be seen from the side surface of the attachment so that they can be inserted into and removed from the inter boom.

According to such a configuration, in the attachment folding posture, the inter boom cylinder and the arm cylinder are arranged so as to intersect with each other. Therefore, as compared with the known technology, both cylinders are occupied in the height direction while ensuring an equivalent moment length. Space can be reduced.

In addition, in the attachment extension posture in which the boom, the inter boom, and the arm extend substantially linearly, the first mounting pin that connects the inter boom cylinder and the inter boom and the second that connects the arm cylinder and the inter boom. The mounting pins are arranged so that the entire heads of the first mounting pin and the second mounting pin can be seen from the side surface of the attachment so that they can be inserted into and removed from the inter boom. For this reason, when disassembling or assembling the work attachment in the attachment extension posture, the first mounting pin and the second mounting pin or the mounting pins and the surrounding cylinders do not interfere with each other and the inter boom. It is possible to easily insert and remove the mounting pins for connecting.

Further, in the work machine, the inter boom cylinder includes two inter boom cylinders that are separated from each other in the width direction of the inter boom and are respectively connected to the inter boom by the first mounting pins. The arm cylinder is connected to the inter boom by the second mounting pin at a position sandwiched between the two inter boom cylinders, and the first mounting pin and the second mounting pin have the attachment in a horizontal direction. When viewed from the side surface of the attachment, the first mounting pin is positioned on the front side in the extension direction of the attachment and on the upper side of the second mounting pin as viewed from the side surface of the attachment. Thus, it can be set as the arrangement | positioning.

According to such a configuration, even when one or a plurality of arm cylinders are arranged between the two inter boom cylinders, when the attachment is extended in the horizontal direction, the two are viewed from the side of the attachment. The first mounting pin for connecting the inter boom cylinder to the inter boom is on the front side in the extension direction of the attachment and the second mounting pin than the second mounting pin for connecting one or more arm cylinders to the inter boom. The first mounting pin and the second mounting pin can be inserted into and removed from the inter boom while securing the stroke length of each cylinder. Therefore, the insertion / removal operation of the second mounting pin for connecting the intermediate one or plural arm cylinders and the inter boom is easily performed without being interfered by the first mounting pin and the two inter boom cylinders. Is possible. Further, in this configuration, when one arm cylinder is used, the first mounting pin that connects the two inter boom cylinders and the inter boom connects the second arm cylinder and the inter boom. Since it is arranged above the mounting pin, the moment length for two inter boom cylinders to rotate the inter boom is shorter than the moment length for one arm cylinder to rotate the inter boom. Since the driving force of the two inter boom cylinders can be easily set larger than the driving force of the one arm cylinder, the capability of the work machine can be maintained.

Moreover, when one arm cylinder is used, when the attachment is extended and the work is performed in the attachment extension posture, the two inter boom cylinders are arranged at positions far from the distal end side of the attachment. The arm cylinder is disposed at a position close to the distal end side of the attachment. Thereby, it is possible to suppress the arm cylinder from projecting in the width direction at the tip end side of the attachment. This can reduce the risk of damage to the arm cylinder during operation. In addition, the arm cylinder is prevented from projecting in the width direction at the tip of the attachment, so that the operator sitting in the driver's seat of the work machine does not get in the way when looking at the tip of the attachment. improves.

Furthermore, in the work machine, the arm cylinder includes two arm cylinders that are separated from each other in the width direction of the inter boom and are respectively connected to the inter boom by the second mounting pins. The boom cylinder is connected to the inter-boom by the first mounting pin at a position sandwiched between the two arm cylinders, and the attachment extends horizontally in the first mounting pin and the second mounting pin. In the posture, the second mounting pin is located on the rear side in the extension direction of the attachment and on the upper side of the first mounting pin as viewed from the side surface of the attachment. Can be configured.

According to such a configuration, even when one or a plurality of inter boom cylinders are arranged between the two arm cylinders, when the attachment is extended in the horizontal direction, the two are viewed from the side of the attachment. The second mounting pin for connecting the arm cylinder to the inter boom is located on the rear side in the extension direction of the attachment and the first mounting pin than the first mounting pin for connecting one or a plurality of inter boom cylinders to the inter boom. It is arranged to be on the upper side of the pin. For this reason, the first mounting pin and the second mounting pin can be inserted into and removed from the inter boom while securing the stroke length of each cylinder. Therefore, the insertion / removal operation of the first mounting pin for connecting the intermediate one or plural inter boom cylinders and the inter boom is easily performed without being interfered by the second mounting pin and the two arm cylinders. Is possible. In addition, in this configuration, when one inter boom cylinder is used, the second mounting pin that connects the two arm cylinders and the inter boom connects the one inter boom cylinder and the inter boom. It is arrange | positioned above one attachment pin. For this reason, the moment length for two arm cylinders to rotate the inter boom is shorter than the moment length for one inter boom cylinder to rotate the inter boom, but the driving force of the two arm cylinders Since it is easy to set larger than the driving force of one inter boom cylinder, the capability of the work machine can be maintained.

21 Lower traveling body 22 Upper turning body 23

Base machine

24, 124 Work attachment 25 Boom

25a Main boom

25b, 125b Front boom

25c Insert boom

26, 126

Inter boom

27, 127 Arm 29

Boom cylinder

30, 130

Inter boom cylinder

31, 131 Arm cylinder 32

Working device cylinder

40a, 140a First mounting

40b, 140b Second mounting pin

Claims

A working machine,
The work machine is configured by attaching a work attachment to a base machine,
The work attachment is
A boom attached to the base machine so as to be raised and lowered;
An inter boom attached to the tip of the boom so as to be rotatable about a horizontal axis;
An arm pivotably attached to the tip of the inter boom around a horizontal axis;
A working device attached to the tip of the arm;
A boom cylinder for raising and lowering the boom;
At least one inter boom cylinder provided on the front side of the work attachment in a state in which the work attachment is extended and started up and between the boom and the inter boom, and for rotating the inter boom. ,
At least one arm cylinder provided on the front side of the work attachment in a state where the work attachment is extended and started up, and between the inter boom and the arm, and operating the arm;
A first mounting pin that connects the inter boom cylinder to the inter boom so as to be rotatable about a horizontal axis, and is mounted so as to move in the horizontal direction so that it can be inserted into and removed from the inter boom;
A second mounting pin that connects the arm cylinder to the inter boom so as to be rotatable about a horizontal axis, and is attached so that the arm cylinder can move in the horizontal direction and be inserted into and removed from the inter boom;
With
The first mounting pin and the second mounting pin are:
When the attachment is folded in a three-fold manner so that the boom is disposed on the upper side of the inter boom and the arm is disposed on the lower side of the inter boom, the attachment is The second mounting pin is located above the first mounting pin so that the inter boom cylinder and the arm cylinder intersect each other,
The first mounting pin and the second mounting pin can be inserted into and removed from the inter boom, respectively, when the attachment is in an attachment extension posture so that the boom, the inter boom, and the arm extend substantially linearly. Thus, it becomes a position where the entire head of the first mounting pin and the second mounting pin can be seen from the side surface of the attachment,
Arranged so that,
A working machine characterized by that.
The inter boom cylinder includes two inter boom cylinders that are separated from each other in the width direction of the inter boom and are respectively connected to the inter boom by the first mounting pins.
The arm cylinder is connected to the inter boom by the second mounting pin at a position sandwiched between the two inter boom cylinders,
In the posture in which the attachment extends in the horizontal direction, the first attachment pin and the second attachment pin are more attached to the attachment than the second attachment pin when viewed from the side of the attachment. It is arranged so as to be on the front side in the extension direction and on the upper side of the second mounting pin,
The work machine according to claim 1.
The arm cylinder includes two arm cylinders that are separated from each other in the width direction of the inter boom and are respectively connected to the inter boom by the second mounting pins.
The inter boom cylinder is connected to the inter boom by the first mounting pin at a position sandwiched between the two arm cylinders.
In the posture in which the attachment extends in the horizontal direction, the first attachment pin and the second attachment pin are more attached to the attachment than the first attachment pin when viewed from the side of the attachment. It is arranged so as to be located on the rear side in the extension direction and on the upper side of the first mounting pin.
The work machine according to claim 1.