JP2013002042A - Work machine and its assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize easy pin hole alignment by utilizing correction force generated by lifting operation even in the conditions that the inclinations of ground surfaces supporting a base machine and a work attachment are different.SOLUTION: A grounding tool 47 is provided on the front end side lower face of a work attachment 36 in an assembled attitude. A ground surface 47a of the grounding tool 47 has a width dimension W2 set so that it serves as a supporting point to permit the rotation of the work attachment 36 when correction force F as a rotating moment in a falling-down direction works on the work attachment 36 with lifting operation in the conditions that the inclinations of ground surfaces G1, G2 supporting the base machine and the work attachment 36 are different.

Description

  The present invention relates to a work machine such as a dismantling machine configured by attaching a work attachment to a 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 that 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. .

  In the base machine 3, a main boom 4 is attached to the front part of the upper swing body 2 so as to be able to rise and fall around a boom foot pin 5, and a work attachment 6 is attached to the tip of the main boom 4.

  The work attachment 6 is attached to the front boom 7 at the front end of the main boom 4 so as to be rotatable about the horizontal axis, and is attached to the front end of the front boom 7 so as to be rotatable about the horizontal axis for the purpose of expanding the work range. A short inter-boom 8, an arm 9 attached to the tip of the inter-boom 8 so as to be rotatable around a horizontal axis, and a working device attached to the tip of the arm 9 (referred to as a nibler in the illustrated example) An open / close type crusher is shown, but a drilling bucket or a crushing breaker may be attached depending on the application) 10.

  In addition, although the single thing is illustrated as a front boom 7 in the figure, there is also a structure in which a plurality of boom bodies are detachably connected.

  Further, as hydraulic cylinders for operating the main boom 4 and the work attachment 6, a boom cylinder 11 for raising and lowering the main boom 4, an inter boom cylinder 12 for rotating the inter boom 8, an arm cylinder 13 for rotating the arm 9, In addition, a working device cylinder 14 for rotating the working device 10 is provided. Reference numeral 15 denotes a link mechanism that converts the thrust of the working device cylinder 14 to the working device 10 by converting it into turning power.

  The inter boom and arm cylinders 12 and 13 are respectively provided between the front boom 7 and the inter boom 8 and between the inter boom 8 and the arm 9 on the front side of the attachment.

  Further, the work device cylinder 14 is provided between the arm 9 and the work device 10 on the attachment rear side.

  The main boom 4 and the front boom 7 are detachably pin-coupled, and are disassembled and transported into a set of the base machine 3 and the main boom 4 and a work attachment 6 including the front boom 7 and assembled after transport.

  This assembly structure and assembly method will be described with reference to FIGS.

  At the time of assembly, the work attachment 6 is folded in a three-fold state with the front boom 7 on the upper side and the arm 9 on the lower side with the inter boom 8 as shown in FIG. 11, and is placed on the ground. The proximal end side is supported by the gantry 16 and the distal end side is grounded and supported.

  The gantry 16 includes an upwardly bifurcated boom receiving portion 16a as shown in an enlarged view in FIG. 13, and a receiving shaft 16b that protrudes horizontally and horizontally on the side surface of the base end portion of the front boom 7 is provided on the boom receiving portion 16a. The base end side of the work attachment 6 is supported in the fitted state.

  On the other hand, as a means for supporting the distal end side of the work attachment 6, a grounding tool 17 is provided on the upper surface (the lower surface in the folded state) of the base end portion of the arm 9.

  As shown in FIG. 14, the grounding device 17 has a large area covering almost the entire width of the arm 9 so that the work attachment 6 can be supported in a stable state that does not wobble in the width direction in consideration of storage and transportation. Configured to ground in range. In FIG. 14, 17a is a grounding surface which is the lower surface of the grounding tool 17, and W1 is a width dimension of the grounding surface 17a.

  Hereinafter, the posture of the work attachment 6 shown in FIG. 11, that is, the posture in which the work attachment 6 is placed on the ground in a three-folded lying state and the base end side is supported by the gantry 16 and the distal end side is supported by the grounding device 17 is referred to as “assembly posture”.

  The work device 10 may be attached at this stage or may be attached later.

  As a means for connecting the main and front booms 4 and 7, as shown in FIG. 13, the upper portions of the ends of the booms 4 and 7 connected to each other (the upper portion in the assembly posture. ) Are provided with upper pin holes 18 and 19, respectively, and lower pin holes 20 and 21 are provided at the lower part thereof. As shown in FIGS. 10 and 12, the upper pin holes 18 and 19 have upper pins 22 and the lower pin holes 20 and 21 have lower parts. By inserting the pins 23, the booms 4 and 7 are detachably connected.

  Further, as a structure for connecting (assembling) and separating (disassembling) the booms 4 and 7 by themselves without using a crane, as shown in FIG. 13, the upper pin hole 18 at the tip of the main boom 4 is used. A shaft body (usually a round pin) 24 extending horizontally in the boom width direction is provided on the outer surface on the base end side of the front boom 7, while facing downward to the base end side from the upper pin hole 19 in the base end portion of the front boom 7. A hook 25 (both are labeled only in FIGS. 13 and 14) is provided.

  The procedure for connecting the main and front booms 4 and 7 is as follows.

  (i) In the assembly posture, as shown in FIGS. 11 and 13, the base machine 3 is advanced using the self-propelling function of the lower traveling body 1, and the main boom 4 is raised to bring the shaft body 24 into the hook 25 from below. Engage.

  (ii) In this state, the main boom 4 and the front boom 7 (the entire work attachment 6 as shown in FIG. ) Are rotated relative to each other about the shaft body 24 so that the upper pin holes 18 and 19 coincide with each other, and the upper pin 22 is inserted into the coincident upper pin holes 18 and 19.

  At this stage, the attachment-side receiving shaft 16 b is detached upward from the boom receiving portion 16 a of the gantry 16, and the attachment base end side is supported by the upper pin 22 instead of the gantry 16.

  (iii) The main boom 4 is further pivoted upward, and the front boom 7 is pivoted in the first descending direction around the upper pin 22, thereby separating the hook 25 from the shaft body 24 while the lower pin holes of each other. The lower pins 23 are inserted into the pin holes 20 and 21.

  In this way, the main boom 4 and the front boom 7 (work attachment 6) are connected, the work device 10 is attached to the tip of the arm 9, and the assembly is completed.

  Decomposition is performed by the reverse procedure and operation.

  The above configuration is shown in Patent Document 1.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique in which the tilt of the gantry supporting the work attachment 6 can be adjusted according to the ground in order to facilitate pin hole alignment during assembly and disassembly.

JP 2009-293261 A JP 2008-308873 A

  FIG. 14 shows a situation where the inclinations of the support grounds G1 and G2 on the base machine side and the work attachment side are different (an example where the support ground G1 on the base machine side is horizontal and the support ground G2 on the attachment side is inclined as shown in the figure) 11), when performing a “lifting operation” in which the main boom side shaft body 24 is engaged with the front boom side hook 25 as shown in FIGS. The relationship between the main boom 4 and the work attachment 6 is schematically shown.

  Since the main boom 4 and the work attachment 6 are inclined relative to each other depending on the state of the support grounds G1 and G2 as shown in the drawing, the main boom side shaft body 24 is placed on the front boom side as shown in FIGS. At the stage of engaging with the hook 25, only the lower shaft member 24 and the hook 25 are engaged, and the upper shaft member 24 and the hook 25 are in a so-called one-sided state where they are not properly engaged.

  When the “lifting operation” is performed in this state, the lifting force causes the work attachment 6 to correct the rotational moment in the sideways direction indicated by the arrow in FIG. 14, that is, the inclination of the work attachment 6 to follow the main boom 4. An external force (hereinafter referred to as a correction force) F acts.

  However, here, the grounding tool 17 that supports the tip end of the attachment has a sufficiently large contact across almost the entire width of the work attachment 6 (arm 9) from the viewpoint of stably supporting the tip end of the attachment in the width direction as described above. Since it is formed with the ground width dimension W1 and is directly affected by the inclination of the ground G2, it is not corrected by the correction force F.

  For this reason, the original pin hole alignment function by the shaft body 24 and the hook 25 does not work, and the upper pin holes 18 and 19 are inconsistent and the upper pin 22 cannot be inserted (cannot be assembled).

  On the other hand, if the mount of patent document 2 is used, the inclination of the work attachment 6 can be corrected by adjusting the tilt of the mount, and the upper pin hole can be aligned.

  However, according to this known technique, a large frame for supporting the entire attachment is required, which increases the cost significantly and makes the handling troublesome.

  Therefore, on the premise of the known technique described in Patent Document 1, the present invention easily performs pin hole alignment by utilizing the “correcting force” due to the lifting operation even in a situation where the inclination of the support ground of the base machine and the work attachment is different. Provided is a work machine that can be used and an assembly method thereof.

  As means for solving the above-mentioned problems, in the work machine of the present invention, a self-propelled base machine, a main boom attached to the base machine in a undulating manner, and an operation to be detachably attached to the tip of the main boom The main boom and the work attachment are connected in a state where pins are inserted into the respective pin holes, and a horizontal shaft body is provided on one of the main boom and the work attachment, and the shaft body is provided on the other. A hook that engages with the main boom and the work attachment placed on the ground in an assembly posture and the main boom are assembled and the main boom is rotated upward with the shaft and the hook engaged. By moving the main boom and the work attachment with the shaft body In a working machine configured to rotate relative to the center so that the pin holes are aligned with each other, the work attachment weight is grounded at least at the lifting stage to support the work attachment weight on the distal end side of the work attachment in the assembly posture. The grounding surface of this grounding part is set to a width dimension that allows rotation of the work attachment as a fulcrum when a rotational moment in the laying direction acts on the work attachment by the lifting operation. (Claim 1).

  The assembly method of the present invention comprises a self-propelled base machine, a main boom attached to the base machine so as to be raised and lowered, and a work attachment detachably attached to the tip of the main boom. The main boom and the work attachment are connected in a state where pins are inserted into the respective pin holes, and a horizontal shaft body is provided on one side of the main boom and the work attachment, and a hook that engages with the shaft body is provided on the other side. The main boom is pivoted upward while the shaft and the hook are engaged during assembly for connecting the main boom and the work attachment placed on the ground in an assembly posture. By performing a lifting operation to lift the part, the main boom and the work attachment are rotated relative to each other about the shaft body, and are mutually connected. In the assembling method of the work machine configured to match the pin holes, in a state in which the work attachment weight is supported on the tip side in the assembly posture of the work attachment while allowing the work attachment to rotate in the lateral direction. A grounding portion for grounding is provided, and the work attachment is brought into contact with the grounding portion by a rotational moment in a lateral direction acting on the work attachment during the lifting operation in a situation where the inclination of the support ground of the base machine and the work attachment is different. The upper pin hole is made to coincide by rotating the ground surface as a fulcrum (claim 5).

  According to this working machine and assembling method, when a rotational moment in the laid-down direction is applied to the work attachment by a lifting operation in a situation where the inclination of the support ground of the base machine and the work attachment is different, the grounding surface of the grounding portion is used as a fulcrum. By rotating the work attachment and making use of the correction force, the work attachment can be made to follow the main boom, and the pin holes can be made to coincide with each other.

  That is, the pin hole alignment can be easily performed by utilizing the original pin hole alignment function by the shaft body and the hook.

  In this case, as a work machine, a work attachment is configured by the front boom, the arm, and the work device as described above, and in a machine in which this work attachment is placed on the ground in a three-fold state during assembly, the arm in the assembly posture is used. On the lower surface side, a flat surface that is horizontal in the assembly posture and supports the entire attachment, and an inclined surface that inclines upward from the tip of the flat surface and becomes non-grounded in the assembly posture, It is desirable to provide the grounding portion on the inclined surface in a state of grounding only at the lifting stage.

  Further, as an assembling method, the work attachment is supported on the ground by a support member in the assembly posture with the grounding portion floating from the ground, and the support by the support member is released by the lifting operation and the grounding portion Is preferably grounded (claim 6).

  In this way, the work attachment can be stably supported on the ground by the flat surface before the lifting operation.

  On the other hand, in the lifting stage, the grounding portion is grounded instead of the flat surface, so that the pin hole can be easily aligned by the rotation action of the work attachment by the correction force.

  In other words, when the work attachment is placed on the ground or loading platform, including during storage and transportation, it ensures a stable support state, while turning it at the lifting stage, making the support state unstable and pin holes by the shaft and hook. The matching function can be demonstrated.

  In addition, since the attachment support in the assembly posture is stable, the gantry can be omitted or simplified during assembly, storage, and transportation.

  Alternatively, the work machine includes an attachment support member, and the attachment support member supports the proximal end side of the work attachment in the assembly posture, and is configured to be unsupported during the lifting operation, and the grounding portion is Further, it may be provided in a state where it is grounded before and after the lifting operation (claim 3).

  In the present invention, it is desirable that the grounding surface of the grounding portion is formed in a substantially arc shape when viewed from the side.

  In this way, the relative motion (back and forth movement and rotation) of the ground contact surface with the ground is smoothly performed with little resistance, so that workability at the time of assembly and disassembly is good.

  According to the present invention, pin hole alignment can be easily performed by utilizing the “correcting force” due to the lifting operation even in a situation where the inclination of the support ground of the base machine and the work attachment is different.

It is a schematic side view of the state in which the shaft body and the hook were engaged in the dismantling machine according to the first embodiment of the present invention. It is a schematic side view of the state which made the upper pin hole correspond by the raising operation | movement from the state of FIG. 1, and inserted the upper and lower pins. (a) is the state of FIG. 1, (b) is an enlarged view of the work attachment front end side in the state of FIG. It is a perspective view of the work attachment tip side in a 1st embodiment. It is the same bottom view. It is a figure which shows typically the relationship between the main boom at the time of the raising operation in the condition where the inclination of the support ground of a base machine side and a work attachment side differs in 1st Embodiment, and a work attachment. It is the FIG. 1 equivalent view of the demolition machine concerning 2nd Embodiment of this invention. FIG. 3 is a view corresponding to FIG. It is the FIG. 1 equivalent view of the demolition machine concerning 3rd Embodiment of this invention. It is a schematic side view which shows the conventional demolition machine. It is a schematic side view of the state which engaged the shaft and the hook in the conventional dismantling machine. It is a schematic side view of the state which made the upper pin hole correspond by the lifting operation | movement from the state of FIG. 11, and inserted the upper and lower pins. FIG. 12 is a partially enlarged view of the state of FIG. 11. It is a figure which shows typically the relationship between the main boom at the time of the raising operation in the condition where the inclination of the support ground of the base machine side and the work attachment side differs in the conventional demolition machine, and a work attachment.

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

  The embodiment is applied to a dismantling machine with an ultra-long attachment in accordance with the description of the background art.

1st Embodiment (refer FIGS. 1-6)
In the dismantling machine of the first embodiment, the following points are the same as the prior art (known technique described in Patent Document 1) shown in FIGS.

  (I) A base machine 33 is constituted by a crawler-type lower traveling body 31 and an upper revolving body 32 mounted on the lower traveling body 31 so as to be rotatable about a vertical axis.

  (II) In the base machine 33, a main boom 34 is attached to the front part of the upper swing body 32 so as to be able to rise and fall around a boom foot pin 35, and a work attachment 36 is attached to the tip of the main boom 34.

  (III) The work attachment 36 is attached to the front end of the main boom 34 so as to be rotatable about a horizontal axis, and can be turned about the horizontal axis at the front end of the front boom 37 for the purpose of expanding the work range. A short inter-boom 38 attached, an arm 39 rotatably attached to the tip of the inter-boom 38 around a horizontal axis, and a working device attached to the tip of the arm 39 (refer to FIG. 10). (Not shown here).

  (IV) As hydraulic cylinders for operating the main boom 34 and the work attachment 36, a boom cylinder 41 for raising and lowering the main boom 34, an inter boom cylinder 42 for rotating the inter boom 38, and an arm cylinder 43 for rotating the arm 39 In addition, a work device cylinder 44 for rotating the work device via the link mechanism 45 is provided.

  In the figure, in order to reduce the overall height of the attachment, the inter boom cylinder 42 and the arm cylinder 43 are shown in an assembly posture in a state of crossing the X shape when viewed from the side. Similar to the inter boom cylinder 12 and the arm cylinder 13, both cylinders 42 and 43 may be provided in a non-intersecting state in the assembly posture.

  (V) The main boom 34 and the front boom 37 are detachably pin-connected, and are disassembled and transported into a set of the base machine 33 and the main boom 34 and a work attachment 36 including the front boom 37, and assembled after transport. .

  (VI) At the time of assembly, the work attachment 36 is folded in a three-fold state with the front boom 37 on the upper side and the arm 39 on the lower side with the inter boom 38 as a boundary as shown in FIG. The base end side in this state is supported by a gantry 46 as a support member, and the tip end side is supported by being grounded (the posture of the work attachment 36 in this state is referred to as “assembly posture”).

  (VII) The gantry 46 includes an upwardly bifurcated boom receiving portion 46a, and a receiving shaft 46b that protrudes horizontally and horizontally on the side surface of the base end portion of the front boom 37 is fitted in the boom receiving portion 46a. The point where the base end side of the work attachment 36 is supported.

  (VIII) As a means for connecting the main and front booms 34 and 37, the upper part of the ends of the booms 34 and 37 connected to each other (upper part in the assembly posture; the same applies to the vertical direction described below). Pin holes 48 and 49, lower pin holes 50 and 51 are provided in the lower part, upper pin 52 and upper pin 52 are inserted in upper pin holes 48 and 49, and lower pin 53 (shown in FIG. 2) is inserted in lower pin holes 50 and 51, respectively. By doing so, both booms 34 and 37 are detachably connected.

  (IX) As a structure for automatically connecting (assembling) and separating (disassembling) the two booms 34 and 37 without using a crane, the base side is more proximal than the upper pin hole 48 at the distal end of the main boom 34. A shaft body (usually a round pin) 54 that extends horizontally in the boom width direction is provided on the outer surface of the front boom 7, while a hook 55 that opens downward to the base end side from the upper pin hole 48 in the base end portion of the front boom 7. The point that is provided.

  The connecting procedure of the main and front booms 34 and 37 is the same as that of the conventional dismantling machine as follows.

  (i) In the assembly posture shown in FIGS. 1 and 3A, the base machine 33 is advanced using the self-propelling function of the lower traveling body 1, and the main boom 34 is raised to engage the shaft body 54 with the hook 55. Combine.

  (ii) In this state, the main boom 34 is rotated upward to perform the “lifting operation” for lifting the engaging portion, whereby the main boom 34 and the front boom 37 (the entire work attachment 36) are attached to the shaft body 54. The upper pin holes 48 and 49 are made to coincide with each other, and the upper pin 52 is inserted into both the pin holes 48 and 49.

  At this stage, the attachment-side receiving shaft 46 b is detached upward from the boom receiving portion 46 a of the gantry 46, and the attachment base end side is supported by the upper pin 52 instead of the gantry 46.

  (iii) The main boom 34 is further pivoted upward, and the front boom 37 is pivoted in the first descending direction around the upper pin 52, thereby separating the hook 55 from the shaft body 54 and the lower pin holes of each other. 50 and 51 are made to correspond, and the lower pin 53 is inserted in these pin holes 50 and 51.

  In this way, the main boom 34 and the front boom 37 (work attachment 36) are connected, the work device is attached to the tip of the arm 39, and the assembly is completed.

  Decomposition is performed by the reverse procedure and operation.

  In the first embodiment, as a means for supporting the distal end side of the work attachment 36 in the assembly posture of FIG. 1, a grounding tool 47 as a grounding portion is provided on the upper surface (lower surface in the folded state) of the arm 39. ing.

  The difference between the grounding tool 47 and the related structure, that is, the known technique described in Patent Document 1, will be described in detail.

  A flat surface 56 that is horizontal in the assembly posture and supports the entire work attachment 36 is provided on the lower surface side of the arm 39 in the assembly posture.

  The flat surface 56 is provided over a wide range including a portion other than the distal end portion and the base end portion of the lower surface of the arm in the assembly posture, that is, a portion directly below the center of gravity of the attachment in the folded state of the work attachment. When the flat surface 56 contacts the ground in the folded state of the attachment, the entire attachment 36 is stably supported on the ground (loading platform at the time of transportation) in the assembly posture.

  In addition, an inclined surface 57 that slopes forward is provided on the front end side of the flat surface 56, and is continuously provided with the flat surface 56. A grounding tool 47 that supports the weight of the attachment is provided so as to protrude downward.

3 to 5, the grounding tool 47 is formed in a plate shape whose lower surface (grounding surface 47a. Reference numerals only in FIGS. 5 and 6) are substantially arcuate when viewed from the side. The ground plane 47a is
(B) In the assembly position (before the lifting operation), as shown in FIG.
(B) When the lifting operation for aligning the upper pin hole is performed from this assembly posture, it is provided on the lower surface of the arm in a state of grounding for the first time as shown in FIG.

  In other words, the position of the grounding tool 47, the protruding dimension, etc. are set so as to obtain such a grounding action.

  FIG. 6 shows a situation where the inclinations of the support grounds G1 and G2 on the base machine side and the work attachment side are different (a situation where the support ground G1 on the base machine side is horizontal and the support ground G2 on the attachment side is a slope according to FIG. 14). As an example, the relationship between the main boom 34 and the work attachment 36 when performing a “lifting operation” in which the main boom side shaft body 54 is engaged with the front boom side hook 55 and lifted is schematically shown. Yes.

  Due to such a ground condition, the main boom 34 and the work attachment 36 are inclined relative to each other as described above, and when the “lifting operation” is performed in this state, the work attachment 36 is indicated by an arrow in FIG. A rotational moment (correcting force) F in the sideways direction acts.

  Here, the width dimension W2 of the grounding tool 47 (grounding surface 47a) is set to a size that allows rotation of the work attachment 36 as a fulcrum when the correction force F by the lifting operation is applied.

  In other words, the width dimension W2 of the ground contact surface 47a is sufficiently smaller than the width dimension of the work attachment 36 at the portion where the grounding tool 47 is provided (the width dimension of the arm base end), and supports the weight of the attachment. The size of the work attachment 36 is set so that the work attachment 36 can be laid sideways without the gantry 46.

  According to the inventor's analysis and test, this ground contact surface width dimension W2 is specifically about 1/10 of the arm width (based on ground conditions and work attachment size based on 1/10). Value) was found to be appropriate.

  According to this configuration, when the rotation moment (correcting force) F in the lateral direction acts on the work attachment 36 by the lifting operation in the situation where the inclinations of the support grounds G1 and G2 of the base machine 33 and the work attachment 36 are different, the grounding device The work attachment 36 can be automatically rotated with the ground contact surface 47a of 47 as a fulcrum.

  That is, it is possible to make the work attachment 36 follow the main boom 34 by making use of the correction force F and to align the upper pin holes 48 and 49 with each other.

  According to the first embodiment, the work attachment 36 can be stably supported on the ground by the flat surface 56 before the lifting operation.

  On the other hand, in the lifting stage, the grounding tool 47 is grounded instead of the flat surface 56 as described above, so that the pin hole can be easily aligned by the rotating action of the work attachment 36 by the correction force F.

  In other words, the shaft attachment 54 and the hook 55 are made unstable at the lifting stage, making the support state unstable while ensuring a stable support state when the work attachment 36 is placed on the ground or the loading platform, including during storage and transportation. The pin hole alignment function can be demonstrated.

  Further, since the attachment support in the assembly posture is stable, the gantry 46 can be omitted or simplified throughout the assembly, storage, and transportation.

  In addition, when the ground to which the ground surface 47a is grounded is soft, the ground surface 47a may bite into the ground and the attachment correction function during the lifting operation may be lowered. It is desirable to do.

Second embodiment (see FIGS. 7 and 8)
About 2nd Embodiment and 3rd Embodiment mentioned later, only a different point from 1st Embodiment is demonstrated.

  In the first embodiment, the grounding tool 47 is configured not to be grounded in the assembly posture but to be grounded only by the lifting operation, whereas in the second embodiment, the grounding tool 47 is assembled in the assembly posture and the lifting stage. It is configured to ground through (before and after the lifting operation).

  The setting of the grounding surface width dimension of the grounding tool 47 is the same as in the first embodiment.

  Also with this configuration, it is possible to obtain an attachment correction function during a lifting operation, which is a basic action.

Third embodiment (see FIG. 9)
The third embodiment is applied to a dismantling machine that attaches the arm 39 directly to the tip of the front boom 37 without providing an inter boom.

  In this dismantling machine, the assembly posture is not the three-fold state, but the arm 39 extends forward and downward in front of the front boom 37 as shown in the figure, and the tip of the arm is grounded.

  Therefore, in the third embodiment, the grounding tool 47 is provided at the tip of the arm.

  In this case, the grounding tool 47 may be set to be grounded only during the lifting operation without being grounded in the assembly posture as in the first embodiment, or through the lifting operation before and after as in the second embodiment. It may be set to be grounded.

  In the former case, for example, the attachment tip side (arm 39) may be supported by another support member (low mount or wood) at the height at which the grounding tool 47 is first installed during the lifting operation.

Other embodiments
(1) The grounding portion is not limited to the plate-shaped grounding device in which the grounding surface described in the above embodiment is generally arcuate, but an axial grounding device having a spherical surface at the lower end may be used.

  Further, a part of the distal end side member (arm 39 in each embodiment) in the assembly posture of the work attachment 36 may be protruded downward to form the grounding portion.

  (2) The support member that supports the work attachment 36 in the assembly posture is not limited to the stand 46 provided with the receiving portion 46a and the receiving shaft 46b described in the above embodiment, but a stand having a configuration for placing and supporting the entire work attachment. May be used.

  Alternatively, in the dismantling machine of both the first and second embodiments, a structure for supporting the front boom 37 and a mechanism for suspending an arm on the front boom 37 with a rope or a rod may be used in combination.

  (3) Although the shaft body 54 is provided on the main boom 34 side and the hook 55 opening downward on the front boom 37 side is provided in the above embodiment, the hook opening upward on the main boom 34 side and the shaft on the front boom 37 side are provided. Each body may be provided.

  (4) In the above-described embodiment, the main and front booms 34 and 37 have been described as being pin-coupled on both upper and lower sides in the assembly posture, but the upper pin hole 48 is omitted, and the upper portion is hooked with the shaft body 54. You may use 55 engaging parts as a connection part as it is.

  In this case, the lower pin holes 50 and 51 coincide when the work attachment 36 rotates with the grounding tool 47 as a fulcrum by the correction force.

DESCRIPTION OF SYMBOLS 31 Lower traveling body 32 Upper revolving body 33 Base machine 34 Main boom 36 Work attachment 37 Front boom of work attachment 38 Same as above, Inter boom 39 Same as above, Arm 40 Working device 46 Base (support member)
47 Grounding equipment (grounding part)
47a Grounding surface of grounding tool W2 Width dimension of grounding surface 48 Upper pin hole 49 Lower pin hole 52 Upper pin 53 Lower pin 54 Shaft body 55 Hook 56 Flat surface 57 Inclined surface F Correction force G1, G2 Support ground

Claims (6)

  It consists of a self-propelled base machine, a main boom attached to the base machine so that it can be raised and lowered, and a work attachment that is detachably attached to the tip of the main boom. The main boom and the work attachment are connected to each other. A pin is inserted into the hole and connected, and one of the main boom and the work attachment is provided with a horizontal shaft body, and the other is provided with a hook that engages with the shaft body, and is placed on the ground in an assembly posture. By performing a lifting operation of rotating the main boom upward and lifting the engagement portion in a state where the shaft body and the hook are engaged when assembling the work attachment and the main boom, The main boom and the work attachment are rotated relative to each other about the shaft body so that the pin holes are aligned with each other. In the work machine, a grounding portion is provided on the distal end side of the work attachment in the assembly posture to support the weight of the work attachment by grounding at least in the lifting stage, and the grounding surface of the grounding portion is formed by the lifting operation. A work machine having a width dimension that is a fulcrum when a rotation moment in a lateral direction acts on the work attachment and allows the work attachment to rotate.   The work attachment is connected to the main boom, a front boom, an inter boom attached to the tip of the front boom so as to be rotatable about a horizontal axis, and a tip of the inter boom to be rotatable about a horizontal axis. And an operating device attached to the tip of the arm, and the ground boom is placed on the ground in a three-fold state with the front boom on the upper side and the arm on the lower side. With the posture as the assembly posture, on the lower surface side of the arm in the assembly posture, a flat surface that is horizontal in the assembly posture and supports the entire attachment, and tilted upward from the tip of the flat surface, the assembly is performed. An inclined surface that is not grounded in a posture is formed, and the grounding portion is provided on the inclined surface so as to be grounded only at the lifting stage. Working machine according to claim 1, wherein a.   An attachment support member is provided, and the attachment support member is configured to support the proximal end side of the work attachment in the assembly posture while being in an unsupported state during the lifting operation, and the grounding portion is arranged before and after the lifting operation. The work machine according to claim 1, wherein the work machine is provided in a grounded state.   The work machine according to any one of claims 1 to 3, wherein the grounding surface of the grounding portion is formed in a substantially arc shape when viewed from a side surface.   It consists of a self-propelled base machine, a main boom attached to the base machine so that it can be raised and lowered, and a work attachment that is detachably attached to the tip of the main boom. The main boom and the work attachment are connected to each other. A pin is inserted into the hole and connected, and one of the main boom and the work attachment is provided with a horizontal shaft body, and the other is provided with a hook that engages with the shaft body, and is placed on the ground in an assembly posture. By performing a lifting operation of rotating the main boom upward and lifting the engagement portion in a state where the shaft body and the hook are engaged when assembling the work attachment and the main boom, The main boom and the work attachment are rotated relative to each other about the shaft body so that the pin holes are aligned with each other. In the assembling method of the working machine, a grounding portion is provided on the distal end side of the work attachment in the assembly posture so as to ground the work attachment while supporting the weight of the work attachment and allowing the work attachment to rotate in the sideways direction. During the lifting operation when the support ground of the machine and the work attachment are different from each other, the work attachment is rotated about the grounding surface of the grounding portion as a fulcrum by the rotational moment acting on the work attachment. A method of assembling a work machine, characterized by matching pin holes.   The work attachment is supported on the ground by a support member with the grounding part floating from the ground in the assembly posture, and the support by the support member is released by the lifting operation and the grounding part is grounded. A method for assembling a work machine according to claim 5.

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