JP5708346B2 - Work machine - Google Patents

Description

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

  The background art will be described by taking as an example a dismantling machine with an ultra-long attachment used for dismantling high-rise buildings.

  As shown in FIG. 10, the dismantling machine includes a base machine 3 and a work attachment 4 attached to the front part thereof. 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 that can be raised and lowered to the base machine 3 (upper revolving unit 2), and a short length that is attached to the tip of the boom 5 so as to be rotatable around a horizontal axis for the purpose of expanding the work range. 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 (referred to as a nibler in the illustrated example) Device).

  The boom 5 includes a main boom 5a and a front boom 5b that is detachably connected to the upper stage 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.

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

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

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

  The above configuration is shown in Patent Document 1.

JP 2007-203221 A

  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 inter-boom 6 as shown in FIG. Folded into a three-fold state, placed on the ground, and transported separately into a set of the base machine 3 and the main boom 5a and a set of the work attachment 4 excluding the main boom 5a as described above.

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

  Here, in the dismantling machine having the above-described structure, the inter-boom and arm cylinders 10 and 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 keep an interval between the cylinders 10 and 11 so that they do not interfere with each other.

  For this reason, the occupied space of the height direction of both 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 cylinders 10 and 11 with respect to the inter boom 6 (the point of action of the cylinder thrust) are Y1 and Y2. Then, 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 the moment length) α1 and α2. A certain size is required for the lengths α1 and α2.

  As a result, since 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, the ground height (tip height H1 and overall height H2) of the attachment 4 is increased. growing.

  For this reason, the disassembling / assembling work is a high place work, which is not preferable in terms of safety and workability.

  Here, in order to ensure the moment length for securing the necessary operating force as described above, and to lower the height dimension of the attachment (so-called transport height) in the attachment folding posture, in the attachment folding posture When the inter boom cylinder 10 and the arm cylinder 11 are arranged so as to intersect when viewed from the side of the attachment, when disassembling or assembling the work attachment in the attachment extension posture, mounting pins for connecting each cylinder and the inter boom are provided. Since there is a possibility of interference with surrounding cylinders, it becomes difficult to insert and remove the mounting pin.

  Therefore, the present invention provides a work machine that can improve the transportability by reducing the height of the attachment during transportation in the attachment folded posture, and can easily disassemble or assemble the attachment in the attachment extended posture. To do.

  The invention according to claim 1 is a work machine in which a work attachment is attached to a base machine, the work attachment being attached to the base machine so as to be able to be raised and lowered, and a tip of the boom that rotates around a horizontal axis. An interboom that is movably attached, an arm that is pivotally attached to the tip of the interboom about a horizontal axis, and a work device that is attached to the tip of the arm, and the boom is raised and lowered A boom cylinder to be operated, and at least one inter-rotator 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 to rotate the inter-boom. The boom cylinder and the work attachment are 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 to operate the arm, and the inter boom cylinder is rotated about the horizontal axis to the inter boom. A first mounting pin that is connected freely and is mounted so that it can move horizontally 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; A second mounting pin that is attached to the interboom so as to move in a direction so that the boom can be inserted into and removed from the interboom. When the attachment is folded in a three-fold style with the The second mounting pin is positioned above the first mounting pin so that the inter boom cylinder and the arm cylinder intersect with each other when viewed from the side of the joint, and the boom, the inter boom, and the arm are In the attachment extension posture that extends substantially linearly, the entire heads of the first attachment pin and the second attachment pin from the side of the attachment so that the first attachment pin and the second attachment pin can be inserted into and removed from the inter boom, respectively. It is the working machine characterized by being arrange | positioned so that it may become a position which can be seen.

  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. Since 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 of the attachment so that they can be inserted into and removed from the inter boom, the work attachment is set in the attachment extension posture. When disassembling or assembling, the first and second mounting pins or the mounting pins and the surrounding cylinders do not interfere with each other, making it easy to insert and remove the mounting pins that connect the cylinders to the inter boom. Is possible.

  According to a second aspect of the present invention, in the configuration of the first aspect, the two inter boom cylinders that are provided are separated from each other in the width direction of the inter boom, and are 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. In the extended position, 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 of the attachment. , Is what is arranged.

  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.

  According to a third aspect of the present invention, in the configuration of the first aspect, the two provided arm cylinders are separated from each other in the width direction of the inter boom, and are connected to the inter boom by the second mounting pin. The inter boom cylinder is connected to the inter boom by the first mounting pin at a position sandwiched between the two arm cylinders, and the first mounting pin and the second mounting pin have the attachment in a horizontal direction. In the extended posture, when viewed from the side of the attachment, the second mounting pin is positioned behind the first mounting pin in the extension direction of the attachment and above the first mounting pin. , Is what is arranged.

  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. By being arranged so as to be on the upper side of the pin, 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. Since it is arranged above one mounting pin, 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. However, since it is easy to set the driving force of the two arm cylinders to be larger than the driving force of the single inter boom cylinder, the capacity of the work machine can be maintained.

  According to the present invention, it is possible to improve the transportability by reducing the height dimension of the attachment during transportation in the attachment folded posture. In addition, it is possible to easily disassemble or assemble the attachment in the attachment extension posture.

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 embodiments, as an embodiment of the work machine of the present invention, a dismantling machine with an ultra-long attachment is applied as an application subject to the description of the background art.

  The dismantling machine of this embodiment is comprised from the base machine 23 and the work attachment 24, as FIG. 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 (consisting of a main boom 25a, a front boom 25b, and an insert boom 25c) attached to the base machine 23 (upper turning body 22) so as to be raised and lowered, and a front end portion 25b2 of the front boom 25b. A short inter boom 26 that is pivotably mounted in the vertical direction, an arm 27 in which a rear end portion 27b is pivotably mounted in the vertical direction with respect to the tip of the inter boom 26, and a tip of the arm 27 And a working device (not shown) such as a nibler (reference numeral 8 in FIG. 10) attached to the section.

  As cylinders for operating the work attachment 24, a boom cylinder 29 for raising and lowering the boom 25 (the entire attachment), an inter boom cylinder 30 for operating the inter boom 26, an arm cylinder 31 for operating the arm 27, and a work device (not shown). A working device cylinder 32 is provided.

  Further, the inter-boom cylinder and the arm cylinders 30 and 31 each have a boom 25 (front boom 25b) on the front side of the attachment (that is, on the front side of the attachment in a state where the attachment is extended and started as shown in FIG. 10). ) And 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 attachment 24 is folded into a three-fold state with the boom 25 on the upper side and the arm 27 on the lower side with the inter boom 26 as a boundary. It is placed on the ground, separated into a set of the base machine 23 and the main boom 25a, a set of the work attachment 24 excluding the main boom 25a, and the insert boom 25c and transported, and assembled in the same state after transport.

  The above-described configuration is almost the same as the dismantling machine of the known technology shown in FIGS.

  However, the dismantling machine of the present embodiment is different in that it includes two inter boom cylinders 30 and one arm cylinder 31, and both cylinders 30 and 31 are arranged as follows by the mounting pins 40 a to 40 d. .

  As shown in FIGS. 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 40 a 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 40 a connects one end 30 a 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 that it can move in the horizontal direction and be inserted and 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 portion 31a of the arm cylinder 31 to a protruding portion 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. . The second mounting pin 40b is mounted so that it can move in the horizontal direction, be near the rear of the inter boom 26, and be inserted / removed 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 attachment pin 40c is attached 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, when the work attachment 24 is in a three-fold folding manner in which the front boom 25 b is on the upper side and the arm 27 is on the lower side with the inter boom 26 as a boundary, When viewed from the side, the second mounting pin 40b is disposed above the first mounting pin 40a, and the inter boom cylinder 30 and the arm cylinder 31 are disposed so as to cross each other.

  On the other hand, as shown in FIG. 3, when the work attachment 24 is in a posture in which the front boom 25b, the inter boom 26, and the arm 27 are extended in a substantially linear shape, the first attachment is performed. The pin 40a and the second mounting pin 40b are arranged so that the entire heads of the first mounting pin 40a and the second mounting pin 40b can be seen from the side of the attachment so that they can be inserted into and removed from the inter boom 26, respectively. 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 1st attachment pin 40a can be easily inserted or extracted with respect to the inter boom 26, without interfering with the surrounding 2nd attachment pin 40b and the arm cylinder 31. FIG. 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 working machine of the present embodiment configured as described above, as shown in FIGS. 1 and 2, in the attachment folding posture, the inter boom cylinder 30 and the arm cylinder 31 are arranged so as to intersect with each other. In comparison, the occupied space in the height direction of both cylinders 30 and 31 can be reduced while securing an equivalent moment length.

  That is, as shown in FIGS. 10 to 11, the height of both cylinders 30, 31 is ensured while ensuring the necessary moment length, as compared with a known technique in which both cylinders 30, 31 are provided in the same phase and separated vertically. The space occupied in the direction can be reduced.

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

  Further, since the overall height during attachment transportation can be reduced, truck transportation can be facilitated, cost can be reduced, and the center of gravity of the attachment 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 attachment extension posture 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 are The first mounting pin 40a to be connected and the second mounting pin 40b to which the arm cylinder 31 and the inter boom 26 are connected can be viewed from the side of the attachment so that they can be inserted into and removed from the inter boom 26, respectively. Since the first attachment pin 40a and the second attachment pin 40b are arranged so that the entire head can be seen, when the work attachment 24 is disassembled or assembled in the attachment extension posture, the first attachment pin 40a and Second mounting pins 40b or each other The mounting pins 40a and 40b for connecting the cylinders 30 and 31 and the inter boom 26 can be easily inserted and removed without interference between the mounting pins 40a and 40b and the surrounding cylinders 30 and 31. .

(3)
Further, in the working machine of the present embodiment, as shown in FIGS. 3 and 5, the attachment extends in the horizontal direction even if one arm cylinder 31 is disposed between the two inter boom cylinders 30. When viewed from the side of the attachment, the first mounting pin 40a that connects the two inter boom cylinders 30 to the inter boom 26 is the second mounting pin that connects the one arm cylinder 31 to the inter boom 26. The first mounting pin 40a and the second mounting pin 40a and the second mounting pin 40b are secured while ensuring the stroke length of each cylinder 30, 31 because they are arranged on the front side in the extension direction of the attachment and on the upper side of the second mounting pin 40b. The attachment pins 40b can be inserted into and removed from 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 interference 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. Since the two inter boom cylinders 30 rotate the inter boom 26, the moment length β1 for the two inter boom cylinders 30 to rotate the inter boom 26 is used for the single arm cylinder 31 to rotate the inter boom 26. Although it becomes shorter than the moment length β2, it is easy to set the driving force of the two inter boom cylinders 30 to be larger than the driving force of the one arm cylinder 31, so that the capability of the work machine can be maintained.

(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 protruding in the width direction on the distal end 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 arranged on the side closer to the base machine 23, and one arm cylinder 31 is arranged on the far side. Therefore, the center of gravity of the work attachment 24 can be brought close to the base machine 23, and the risk of the work machine falling over 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 the second mounting pins 140 b 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 140 a has a protruding portion 126 a that protrudes downward from a position closer to the front of the inter boom 126 (left side in FIG. 7) on one end portion 130 a of the inter boom cylinder 130. Are connected to be rotatable about a horizontal axis. The first attachment pin 140a is attached so as to move in the horizontal direction and be inserted / 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. The second attachment pin 140b is attached so that it can move in the horizontal direction and be inserted / removed at a position near the rear of the inter boom 126 (right side in FIG. 7) and above the first attachment pin 140a.

  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 attachment pin 140c is attached 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 that it can 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 is the first mounting pin 140a that connects the single inter boom cylinder 130 to the inter boom 126. The first mounting pin 140a and the second mounting pin 140a and the second mounting pin 140a are secured while being arranged on the rear side in the extension direction of the attachment and on the upper side of the first mounting pin 140a. The attachment pins 140b can be inserted into and removed from the inter boom 126, respectively. 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. However, the present invention is not limited to this, and the other apparatus such as a riff mag machine having a magnet attached to the tip of the attachment. It can be widely applied to work machines.

DESCRIPTION OF SYMBOLS 21 Lower traveling body 22 Upper revolving body 23 Base machine 24, 124 Work attachment 25, 125 Boom 25a Main boom 25b, 125b Front boom 25c Insert boom 26, 126 Inter boom 27, 127 Arm 28 Working device 29 Boom cylinder 30, 130 Inter Boom cylinder 31, 131 Arm cylinder 32 Working device cylinder 40a, 140a First mounting pin 40b, 140b Second mounting pin

Claims (3)

A work machine with a work attachment attached 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 boom cylinder for raising and lowering the boom, and a working device attached to a tip of the arm;
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 provided between the boom and the inter boom to rotate the inter boom;
At least one arm 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 interboom and the arm to operate 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:
The inter boom cylinder and the arm cylinder intersect with each other when viewed from the side of the attachment when the attachment is folded in a three-fold manner with the boom at the upper side and the arm at the lower side with the inter boom as a boundary. The second mounting pin is positioned above the first mounting pin, and
In the attachment extension posture in which the boom, the inter boom, and the arm extend substantially linearly, the first attachment pin and the second attachment pin can be inserted into and removed from the inter boom, respectively. It becomes a position where the entire head of the second mounting pin can be seen,
Arranged so that,
A working machine characterized by that. The two inter boom cylinders provided are separated from each other in the width direction of the inter boom, and are 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 mounting pin and the second mounting pin have an extension direction of the attachment more than the second mounting pin, as viewed from the side of the attachment. Is arranged so as to be located on the front side and on the upper side of the second mounting pin.
The work machine according to claim 1. The two provided arm cylinders are separated from each other in the width direction of the inter boom, and are connected to the inter boom by the second mounting pin,
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 mounting pin and the second mounting pin are viewed from the side of the attachment, and the second mounting pin extends in the direction of extension of the attachment relative to the first mounting pin. And arranged so as to be located on the rear side and on the upper side of the first mounting pin.
The work machine according to claim 1.

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