JP2019120020A - Work machine - Google Patents

Abstract

To make it possible to use a tilt type attachment as a hanging type attachment, and to easily shift to a transport posture while mounting an attachment and carry on land.SOLUTION: An arm 24 and an attachment 22 of a work machine 20 are connected by a connection link 50 composed of a swing arm 51, a hanging metal fitting 52, a pressing member 53, and a pressed member. One end of the connection link 50 is connected to a tip of the arm, and the other end is connected to an attachment cylinder 27. An upper end of the hanging metal fitting 52 is hung from the swing arm 51, and the attachment is connected to a lower part. The pressing member 53 is provided in the swing arm 51, and the pressed member 54 is provided in the hanging metal fitting 52. By driving the swing arm in a dumping direction and making the pressing member separated from the pressed member, the attachment becomes in a hung state via the hanging metal fitting. By driving the swing arm in a crowding direction and pressing the pressed member with the pressing member, the attachment 22 rotates in the crowding direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a working machine that lifts and transports a load with a working machine, and in particular, a tilt type attachment can be used as a hanging type attachment, and an operation that can be easily transferred to a transport posture and land transported while mounting the attachment. It relates to the machine.

  There is a working machine in which a gripping device such as a fork grapple is attached as an attachment to a hydraulic shovel which is a base machine. This type of working machine is suitably used for dismantling buildings, passenger cars and the like, removing dismantled materials and rubble, etc. Among the attachments to be used, there is a so-called tilt type that is rotatably connected to the tip of the arm via a rotation shaft and rotates around the rotation shaft by the attachment cylinder (see Patent Document 1 etc.) ).

  The tilt attachment rotates with respect to the arm as the attachment cylinder expands and contracts, and can grip the object not only in the downward facing posture but also in, for example, the forward facing posture. On the other hand, the tilt attachment changes its posture, and the positional relationship between the point of application of its own weight and the weight of the grasped object and the tip of the arm changes. Therefore, the maximum weight of the grip that can be gripped by the tilt attachment is limited. On the other hand, there is a suspension type attachment suspended at the tip of the arm (see Patent Document 2 etc.).

JP, 2009-143705, A

JP, 2009-274806, A

  The hanging attachment is suspended at the tip of the arm and always takes a downward position by gravity, and the positional relationship between the point of application of the weight of the self-weight and the weight of the object to be held and the tip of the arm does not change. Therefore, there is a need in the field where the maximum weight of the graspable object which can be lifted is larger than that of the tilt type attachment, and there are a large number of objects to be transported.

  However, the hanging attachment is merely suspended from the arm, and can not be held by the attachment cylinder like a tilt attachment. Therefore, it is difficult to place the working machine with the hanging attachment attached on the transport vehicle and transport it by land.

  An object of the present invention is to provide a working machine which can be used as a hanging attachment and can be easily transferred to a transport posture and transported by land with the attachment attached.

  In order to achieve the above object, the present invention comprises a vehicle body and a working machine provided on the vehicle body, wherein the working machine is rotatably connected to a front portion of the vehicle body, a boom, and a tip of the boom An arm movably connected, a boom cylinder whose base end is connected to the boom at its tip to the vehicle body, an arm cylinder whose base end is connected to the arm at the tip is connected to the arm, the back of the arm is disposed A working machine comprising: an attachment cylinder whose base end is connected to the arm; and an attachment having a first pin hole connectable to the tip of the arm and a second pin hole connectable to the attachment cylinder through a link. And a connection link interposed between the arm and the attachment and connecting the arm and the attachment, the connection link comprising: An end swings back and forth through a swing arm whose other end is pivotally connected to the attachment cylinder at the tip of the arm of the work machine and a shaft whose upper end extends laterally with respect to the swing arm. A hanging member which is movably connected and hangs down and whose lower part is connected to the first pin hole and the second pin hole of the attachment via a connecting pin, and a pressing member provided on the other end side of the swing arm And a pressing member provided on the suspension fitting or the attachment so as to be positioned on a rotational orbit of the pressing member centered on the axis, and driving the swinging arm in the dumping direction by the attachment cylinder. When the pressing member is separated from the pressed member, the attachment is suspended via the suspension fitting, and the swinging arm is driven in the cloud direction to press the pressing member. The attachment together with the hanger by pressing the pressed member in wood is characterized by being configured to rotate in the cloud direction.

  According to the present invention, the tilt attachment can be converted into a hanging attachment and used simply by interposing the connection link. Modification of existing hydraulic shovels and attachments is not necessary. In addition, it is possible to shift to the holding posture by extending the attachment cylinder and causing the swing arm to interfere with the suspension bracket. Thus, the work machine can be land-transported on a general road while the attachment is attached even if the operator does not particularly perform a fixing operation or the like while being suspended.

Side view of a working machine according to an embodiment of the present invention (a state in which the pressing member is separated from the pressed member) An exploded view of the tip of the arm of the working machine provided in the working machine of FIG. 1 Side view of connecting link provided in the working machine of FIG. 1 A partial cross-sectional front view of a connecting link provided in the working machine of FIG. 1 Side view of a working machine according to an embodiment of the present invention (a state in which the pressing member is in contact with the pressed member) Side view of a working machine according to an embodiment of the present invention (with the attachment tilted in the cloud direction) Side view of a working machine according to an embodiment of the present invention (in a state in which the working machine is in a holding posture) Side view of a connection link (a state in which the pressing member is separated from the pressed member) provided in the working machine according to the first modification Side view of a connection link (a state in which a pressing member is in contact with a pressed member) provided in a working machine according to a first modification Side view of a connection link (a state in which the pressing member is separated from the pressed member) provided in the working machine according to the second modification Side view of a connection link (a state in which the pressing member is in contact with the pressed member) provided in the working machine according to the second modification Side view of a connection link (a state in which the pressing member is separated from the pressed member) provided in the working machine according to the third modification Side view of a connection link (a state in which a pressing member is in contact with a pressed member) provided in a working machine according to a third modification Figure illustrating a fork grapple as a variation of attachment Figure illustrating grapple bucket as a variation of attachment Figure illustrating wood grapple as a variation of attachment

  Embodiments of the present invention will be described below with reference to the drawings.

-Working machine-
FIG. 1 is a side view of a working machine according to an embodiment of the present invention. Hereinafter, the front side (left side in FIG. 1) of the worker who has arrived at the driver's seat will be described as the front of the work machine. The working machine shown in the figure uses a hydraulic shovel as a base machine, and illustrates an embodiment in which a hook device is attached as an attachment 22 which is a working tool to a working arm 21 (described later). The work machine includes a vehicle body 10 and a work machine (front work machine) 20 provided on the vehicle body 10.

  The vehicle body 10 includes a traveling body 11 and a revolving body 12. The traveling body 11 forms a base structure of the working machine, and is a crawler traveling body provided with left and right crawler belts. The left and right crawler belts are driven by respective traveling motors (not shown). The revolving unit 12 is provided on the traveling unit 11 via a pivoting wheel 13 and is driven relative to the traveling unit 11 with a pivoting center extending vertically by driving the pivoting wheel 13 with a pivoting motor (not shown). To turn. The revolving unit 12 includes a driver's cab 14, and in the driver's cab 14, a driver's seat (not shown) on which the operator sits and an operation device (not shown) operated by the operator are arranged. The traveling motor and the swing motor are hydraulic motors but may be electric motors.

  The work machine 20 includes a work arm 21 and an attachment 22 with a hydraulic actuator. The work arm 21 in the present embodiment is an articulated work apparatus including a boom 23, an arm 24, a boom cylinder 25, an arm cylinder 26, and an attachment cylinder 27. The boom 23 is pivotally connected to the front of the base frame (pivotal frame 15) of the revolving structure 12 via an axis extending in the left-right direction. The arm 24 is rotatably connected to the tip of the boom 23 via an axis extending in the left and right direction. The boom cylinder 25 is connected at its base end to the vehicle body 10 (the pivot frame 15 of the revolving unit 12) and at its tip end to the boom 23. The arm cylinder 26 is connected at its proximal end to the boom 23 and at its distal end to the arm 24. The attachment cylinder 27 is disposed on the back side of the arm 24 (the side facing away from the vehicle body 10 in a posture in which the arm 24 is extended vertically), and the base end is connected to the arm 24 while the tip is the first link 28 And the second link 29. The boom cylinder 25, the arm cylinder 26, and the attachment cylinder 27 are all hydraulic cylinders.

  FIG. 2 is an exploded view of the tip of the arm of the working machine. As shown in this figure, the proximal end of the first link 28 is pivotably connected to the arm 24 via an axis extending in the lateral direction. The connection position of the first link 28 with respect to the arm 24 is more than the connection hole 24a connected to the first pin hole 51a (or the first pin hole 37 of the attachment 22) shown in FIG. Located on the proximal side. The tip of the first link 28 is rotatably connected coaxially with the attachment cylinder 27 to the attachment link 27 via an axis extending in the left and right direction. The second link 29 has its tip rotatably coupled to the second pin hole 51b of the connection link 50 (or the second pin hole 38 of the attachment 22), and has its proximal end rotatably coupled to the tip of the first link 28 and the attachment cylinder 27. ing. Although FIG. 1 illustrates a structure in which the attachment cylinder 27 is coaxially connected to both the first link 28 and the second link 29, it can be pivoted to any one of the first link 28 and the second link 29. It may be a connected configuration. In the present embodiment, such a first link 28 and a second link 29 are provided on the left and right sides of the arm 24 one by one.

-Attachment-
The attachment 22 is a hook device, and includes a bracket 31, a pivoting device 32, a frame 33, a hook 34, a gate 35 and a hydraulic cylinder 36.

  The bracket 31 has a first pin hole 37 and a second pin hole 38. The first pin hole 52a of the connection link 50 is connected to the first pin hole 37, and the second pin hole 52b of the connection link 50 is connected to the second pin hole 38 via the connection pins 58 and 59 (FIG. 1), respectively. Be done. Thus, the attachment 22 is fixedly connected to the lower end of the connection link 50. Although the attachment 22 is connected to the working arm 21 via the connection link 50 in the present embodiment, the attachment 22 is essentially a tilt type attachment, and can be directly connected to the working arm 21 without the connection link 50. is there. Specifically, the first pin hole 37 can be connected to the connection hole 24a at the tip of the arm 24, and the second pin hole 38 can be connected to the tip of the second link 29 via the connection pins 58 and 59, respectively. It is. In the case of direct connection to the working arm 21 without the connection link 50, the attachment 22 pivots in accordance with the extension and contraction of the attachment cylinder 27 at all times.

  The frame 33 is attached to the bracket 31 via a pivoting device 32. The pivoting device 32 comprises a pivoting wheel and a pivoting motor (not shown). Hooks 34 and gates 35 are attached to the frame 33. The hook 34 and the gate 35 are rotatably attached to the frame 33 through pins 41 and 42 so as to be movable back and forth. One end of the hydraulic cylinder 36 is connected to the frame 33 via a pin 43 and the other end is connected to the hook 34 via a pin 44. The hook 34 and the gate 35 are connected by an interlocking link 45. The hook 34 pivots with the expansion and contraction of the hydraulic cylinder 36, and the gate 35 pivots with the rotation of the hook 34. Thus, the hook 34 is opened and closed. The swing motor of the swing device 32 and the hydraulic cylinder 36 are hydraulic actuators provided in the attachment 22.

-Consolidated link-
FIG. 3 is a side view of the connection link, and FIG. 4 is a partial sectional front view of the connection link as viewed from the front. In the present embodiment, the connection link 50 is interposed between the arm 24 and the attachment 22, and the arm 24 and the attachment 22 are connected by the connection link 50.

  The connection link 50 includes a swing arm 51, a hanging bracket 52, a pressing member 53, and a pressed member 54.

  The swinging arm 51 has a configuration in which a pair of plates 51p opposite to each other with the arm 24 interposed therebetween is connected by a beam 51q (FIG. 4). As viewed from the left and right, the first pin hole 51a is provided at one end (base end) of the swing arm 51, and the second pin hole 51b is provided at the other end (tip). A shaft 55 extending leftward and rightward is passed through the first pin hole 51a and the connecting hole 24a of the arm 24 of the working machine 20, and one end of the swing arm 51 is rotatably connected to the tip of the arm 24 via the shaft 55. ing. A shaft 56 extending leftward and rightward is passed through the second pin hole 51b and the pin hole 29a (FIG. 2) at the tip of the second link 29, and the other end of the swing arm 51 is attached to the attachment cylinder 27 via the second link 29. It is rotatably connected to the tip via a shaft 56. When the attachment cylinder 27 expands and contracts, the swinging arm 51 swings about the shaft 55 in the cloud direction (counterclockwise direction in FIG. 3) and the dumping direction (clockwise direction).

  The suspension fitting 52 is a joint for connecting the arm 24 and the attachment 22 and suspending the tilt attachment 22 from the arm 24 as a hanging attachment. The suspension fitting 52 in the present embodiment includes a front and rear rocking member 52u constituting an upper half and a left and right rocking member 52l constituting a lower half. The front and rear rocking member 52 u is connected to the rocking arm 51 via a shaft 55 so as to be able to rock back and forth. That is, the swinging arm 51 and the hanging bracket 52 are coaxially connected to the tip of the arm 24 of the working machine 20 via the shaft 55. The left and right rocking member 52l is pivotally connected to the left and right via a shaft 57 extending forward and backward with respect to the lower portion of the front and rear rocking member 52u. At the lower part of the left and right rocking member 52l, a first pin hole 52a is provided at the rear and a second pin hole 52b is provided at the front. The center-to-center distance L1 (FIG. 2) of the first pin hole 52a and the second pin hole 52b is equal to the center-to-center distance L2 (FIG. 2) of the first pin hole 37 and the second pin hole 38 of the attachment 22. The first pin holes 52a and 37 have the same inner diameter, through which the connecting pin 58 (FIG. 1) is passed. The second pin holes 52b and 38 have the same inner diameter, and the connecting pin 59 (FIG. 1) is passed through them. In this manner, the upper end of the suspension bracket 52 is pivotally connected to the pivoting arm 51 so as to swing back and forth via the shaft 55 and fixedly fixed to the attachment 22 by the two connection pins 58 and 59. It is connected. A stopper 52 s is provided at the rear of the suspension fitting 52. The stopper 52s is a member that limits the swinging range of the suspension fitting 52 so that the attachment 22 does not interfere with the arm 24 when the arm 24 is in the upward position.

  In the present embodiment, the pressing member 53 is a plate-like member provided with a plurality (two in the present embodiment) of right and left on the beam 51 q (FIG. 4). In the opposite side of the second link 29. The pressing member 53 is provided with an arc-shaped recessed portion 53 a that is opened opposite to the shaft 56 when viewed from the left and right. The pressed member 54 is provided at the front of the suspension fitting 52 (in the present embodiment, the left and right swinging member 52 l in the present embodiment) so as to be positioned on the pivoting trajectory of the recess 53 a of the pressing member 53 centered on the shaft 55. It is done. In the present embodiment, the pressed member 54 is formed of a circular tubular member, and the connection pin 59 is passed through the pressed member 54.

  The positions of the plurality of pressing members 53 in the left-right direction are all within the extension range of the pressed member 54 in the left-right direction (FIG. 4). The radius of curvature of the recess 53 a of the pressing member 53 is equal to or larger than the radius of the pressed member 54, and is set to the same value as the radius of the pressed member 54 in the present embodiment. A distance L3 between the inscribed circle of the recess 53a and the center of the shaft 55, and a distance L4 between the cross section of the pressed member 54 and the shaft 55 are equal (L3 = L4). However, when the radius of curvature of the concave portion 53a is made larger than the radius of the pressed member 54, the center-to-center distance L3 may be slightly longer than the center-to-center distance L4.

-Operation-
In the working machine of this embodiment, when the attachment cylinder 27 is contracted and the swinging arm 51 is driven in the dumping direction more than a predetermined amount, the pressing member 53 separates from the pressed member 54 as shown in FIG. Thus, the attachment 22 is suspended freely. 1 and 3 show a state in which the attachment cylinder 27 is fully contracted. In this state, the swinging arm 51 does not restrict the swinging movement of the suspension fitting 52 regardless of the posture of the work machine 20 except in special situations such as when the attachment 22 swings significantly. In this embodiment, the traveling body 11, the revolving body 12, the boom cylinder 25, and the arm cylinder 26 are appropriately driven to bring the attachment 22 closer to the object, and the hook 34 hooks the object to close the hook 34 and the gate 35. As a result, the boom cylinder 25 and the arm cylinder 26 can be driven to lift the object, and the object can be transported to a predetermined place.

  When the work machine is loaded onto a transport vehicle such as a trailer after work is completed, the concave portion 53a contacts the outer peripheral portion of the pressed member 54 by extending the attachment cylinder 27 and driving the swing arm 51 in the cloud direction ( Figure 5). Further, when the attachment cylinder 27 is extended, the pressed member 54 is pushed by the pressing member 53, and the attachment 22 together with the hanging bracket 52 is rotated in the cloud direction to shift from the vertical posture to the tilted posture (FIG. 6). Finally, the boom cylinder 25 is contracted and the arm cylinder 26 is extended, so that the work implement 20 is in the holding position (FIG. 7). The highest part of the work machine 20 in the holding position is at the same level as the highest part of the cab 14, and even if the work machine is placed on the platform of the transport vehicle, it falls within the transport restriction height of the general road. The work machine can be loaded on the platform of the transport vehicle.

-Effect-
(1) According to the present embodiment, the tilt attachment 22 can be converted into a hanging attachment only by interposing the connection link 50 between the working arm 21 and the attachment 22. It is only necessary to intervene the connection link 50 between the working arm 21 and the attachment 22 using the existing hydraulic shovel, and the modification of the hydraulic shovel and the attachment itself is unnecessary. In addition, the connection link 50 can shift to the holding posture by extending the attachment cylinder 27 and causing the swing arm 51 to interfere with the suspension bracket 52, in addition to merely converting the attachment 22 into a hanging type. Thus, the work machine can be land-transported on a general road while the attachment 22 is mounted even if the operator does not particularly perform a fixing operation or the like while being suspended.

  A tilt type attachment is widely used as an attachment attached to a working machine in present Japan. Therefore, when the work machine is turned on at the request of the restoration site of the natural disaster, the work machine using the tilt type attachment is easy to procure from the viewpoint of responding to sudden and urgent needs quickly and flexibly. On the other hand, the tilt attachment has a large maximum load restriction and is not always advantageous in terms of efficiency when there are a large number of objects to be transported. According to this embodiment, the tilt attachment can be converted into a hanging attachment for use. The maximum load capacity can be increased compared to using a tilt attachment as a tilt attachment. By using a tilt attachment that is easy to procure, it is possible to respond quickly and flexibly to urgent needs, and work efficiency can be improved as compared to using the tilt attachment as specified. At that time, if it is necessary to attach and detach the attachment 22 when transporting the working machine by land, the quickness of responding to the urgent needs is lost, but in the present embodiment, the working machine is mounted with the attachment 22 as described above. The ability to transport land by land also greatly contributes to securing the promptness of the response.

  (2) As long as the hanging bracket 52 is clouded by the swing arm 51, for example, the hanging bracket 52 may be suspended in the middle of the swing arm 51 (for example, between the shaft 55 and the pressing member 53) . However, in this case, the point of action of the weight of the attachment 22 or the like moves forward of the tip of the arm 24, and the maximum load must be estimated low. On the other hand, in the present embodiment, the swinging arm 51 and the hanging bracket 52 are coaxially connected to the tip of the arm 24 of the working machine 20 via the shaft 55 to position the action point directly below the tip of the arm 24. Can. Therefore, there is no need to underestimate the maximum load capacity and management is easy.

  (3) The attachment 22 can be swung not only in the front-rear direction but also in the left-right direction because the suspension metal fitting comprises the front-rear swinging member 52u and the left-right swinging member 52l. Therefore, the load acting on the connection link 50 can be released by the inertia of the attachment 22 or the like at the time of turning, and the alignment of the attachment 22 with the object to be lifted can be made flexible.

-Modified example-
First Modified Example FIG. 8 is a side view of a connection link provided in a working machine according to a first modified example. The same or corresponding parts in the embodiment as in the embodiment described with reference to FIGS. The connecting link 50A according to this embodiment is different from the connecting link 50 of the above embodiment in the configuration of the swing arm 51A and the pressing member 53A. The swing arm 51A is extended on the other end side (shaft 56 side) and is curved toward the cloud side, and a pressing member 53A is attached to the end of the curved portion. Although the pressed member is not shown, it may have the same configuration as the pressed member 54 of the above embodiment, or may be changed to a shape in which the surface facing the pressing member 53A is matched with the pressing member 53A. The other configuration is the same as that of the above embodiment.

  Even in this configuration, the attachment 22 can be used as a hanging type, and when the swinging arm 51A is extended as shown in FIG. 9, the pressed member (not shown) can be pushed by the pressing member 53A to shift the attachment 22 into the holding posture. As described above, the shapes of the components of the connection link, including the swing arm and the pressing member, can be appropriately changed as long as the basic effect (1) described above is obtained.

Second Modified Example FIG. 10 is a side view of a connection link provided in a working machine according to a second modified example. The same or corresponding parts as in the embodiment described with reference to FIGS. 1 to 7 will be denoted by the same reference numerals as in FIGS. 1 to 7 as appropriate, and the description thereof will be omitted. The connecting link 50B according to the present embodiment is different from the connecting link 50 of the above embodiment in that the swinging arm 51B can be connected to the suspension fitting 52 by means of the removable connecting pin 60. The swinging arm 51B is provided with pin holes 51c penetrating left and right plates 51p and beams 51q (FIG. 4) to the left and right. Further, a bracket 52 d having a pin hole 52 c is provided on the left and right swinging member 52 l of the suspension fitting 52. In this example, the pin hole 51c corresponds to the pressing member and the pin hole 52c to the pressed member, and when the swing arm 51 is driven in the cloud direction, the pin holes 51c and 52c overlap and can be connected by the connecting shaft 60 as shown in FIG. It is supposed to be. By attaching and detaching the connecting shaft 60, the pressing member comes in contact with the pressed member via the connecting shaft 60, and the suspension fitting 52 is restrained by the swinging arm 51B or released. The other configuration is the same as that of the above embodiment.

  Also in this example, the attachment 22 can be used as a hanging type, and the swing arm 51A is extended and the suspension fitting 52 is connected to the swing arm 51B by the connecting shaft 60 as shown in FIG. it can.

Third Modified Example FIG. 12 is a side view of a connection link provided in a working machine according to a third modified example. The same or corresponding parts as those in the example described in the second modification are given the same reference numerals in FIGS. 10 and 11 as appropriate in the drawing, and the description will be omitted. The connecting link 50C according to the present embodiment differs from the connecting link 50B according to the second modification in that the bracket 52d and thus the pressed member are provided on the attachment 22 (the bracket 31 in the present example). When the swinging arm 51C rotates in the direction of the cloud, the pin hole 51c overlaps the pin hole 52c of the bracket 52d, and can be connected to the attachment 22 through the connecting shaft 60 through the pin holes 51c and 52c as shown in FIG. . Even when the pressed member is provided to the attachment 22 as described above, the same effect can be obtained. Note that the attachment 22 can also be provided with a pressed member that is not connected to the pressing member as in the embodiment and the first modification.

In the above, the hook device has been described as an example of the attachment 22. However, a tilt-type fork grapple (FIG. 14) used for scrap processing, transportation or the like of waste material can also be used as the attachment 22. The attachment 22 may be of a tilt type, and in particular, an attachment of a type such as a grapple bucket (FIG. 15) or a wood grapple (FIG. 16) which grips or scrapes an object by opening and closing can be suitably applied.

  Although the present invention is applied to a working machine having a hydraulic shovel having only one working arm as a base machine, the present invention is applied to a working machine having two working arms. The invention is applicable. Although the working machine provided with the crawler type traveling body 11 as the base structure has been illustrated, the present invention is also applicable to a working machine provided with a wheel type traveling body. In addition, although the working machine in which the cab and the engine room etc. turn with respect to the traveling body 11 together with the working machine 20 as the revolving unit 12 is illustrated, the working machine having a configuration in which the cab and the like are fixed to the traveling body and does not turn The present invention is also applicable.

DESCRIPTION OF SYMBOLS 10 ... Vehicle body, 20 ... Work machine, 23 ... Boom, 24 ... Arm, 25 ... Boom cylinder, 26 ... Arm cylinder, 27 ... Attachment cylinder, 29 ... 2nd link (link), 37 ... 1st pin hole, 38 ... 2nd pin hole 50, 50A-50C ... connection link, 51, 51A-51C ... rocking arm, 52 ... hanging bracket, 52l ... left and right rocking member, 52u ... front and back rocking member, 53, 53A ... pressing member, 54 ... A pressed member, 55 ... axis, 58, 59 ... connection pin, 60 ... connection axis

Claims (4)

A vehicle body and a work machine provided on the vehicle body, wherein the work machine is a boom pivotally connected to a front portion of the vehicle body, an arm pivotally connected to a distal end of the boom, and a base end is the vehicle body A boom cylinder whose distal end is connected to the boom, an arm cylinder whose proximal end is connected to the boom to the arm, an attachment cylinder disposed on the back of the arm and whose proximal end is connected to the arm, And a work machine comprising an attachment having a first pin hole connectable to the tip of the arm and a second pin hole connectable to the attachment cylinder through a link.
The connection link which intervenes between the arm and the attachment and connects the arm and the attachment is provided.
The connection link is
A swing arm having one end rotatably connected to the tip of the arm of the work machine and the other end rotatably connected to the attachment cylinder;
The upper end is pivotally connected back and forth via a shaft extending leftward and rightward with respect to the swinging arm, and the lower portion is connected to the first pin hole and the second pin hole of the attachment via a connecting pin. The hanging bracket,
A pressing member provided on the other end side of the swing arm;
And a pressed member provided on the suspension fitting or the attachment so as to be positioned on a rotation path of the pressing member about the axis.
By driving the swinging arm in the dumping direction by the attachment cylinder to move the pressing member away from the pressed member, the attachment is suspended via the suspension fitting, and the swinging arm is moved in the cloud direction. A working machine characterized in that the attachment is pivoted in the cloud direction together with the suspension fitting by driving and pressing the pressed member with the pressing member.   The working machine according to claim 1, wherein the swing arm and the suspension fitting are coaxially connected to the tip of the arm of the working machine via the shaft.   The work machine according to claim 1, wherein the suspension fitting is provided at a lower portion of the front and rear swing member, and a front and rear swing member connected swingably back and forth to the swing arm via the shaft. A working machine comprising: a left and right rocking member connected swingably to the left and right and supporting the attachment.   The working machine according to claim 1, further comprising a detachable connecting shaft that connects the pressing member and the pressed member.

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