JP2017179943A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine capable of keeping the highest position of an adapter within a transportation control height without replacing a support link for supporting the adapter during transportation of the work machine.SOLUTION: A hydraulic shovel includes an adapter 5 pivotably connected to an upper frame 4, a support link 6 supporting the adapter 5, and a rotation preventing member 8. The support link 6 takes a stretching state ST1 in which links 61, 62 linearly extend and a bending state in which the links 61, 62 are bent in a dogleg shape. The highest position 5H of the adapter 5 supported by the support link 6 in the stretching state ST1 is higher than a transportation control height HT. The highest position 5H of the adapter 5 supported by the support link 6 in the bending state is lower than the transportation control height HT. A connecting part 63 is disposed so that the rotational axis of a connecting pin 9 is located behind a machine from an axis line 6A of the support link 6 in the stretching state ST1.SELECTED DRAWING: Figure 5

Description

The present invention relates to a work machine provided with an adapter for increasing the mounting position of a boom.

  2. Description of the Related Art Conventionally, there is a work machine in which an adapter is inserted into a base end portion of a boom for the purpose of raising the mounting position of the boom. In such a work machine, the link supporting the adapter is replaced with a dedicated transport link in order to keep the adapter at a transportation regulation height during transportation (for example, Patent Document 1).

  In Patent Document 1, the main link (6) supporting the adapter (4) is replaced with the transport link (8), and the adapter (4) is supported in a state where the adapter (4) is tilted forward by the transport link (8). (See FIG. 5 of Patent Document 1). According to this, it is possible to make the highest part of an adapter (4) lower than transportation regulation height (HT).

JP2015-155620A

  However, in the invention of Patent Document 1, since it takes time to replace the link (6) with the transport link (8) during transportation, work efficiency is not necessarily good.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a work machine capable of keeping the highest position of the adapter within the transportation regulation height without changing the support link that supports the adapter when the work machine is transported. .

  To achieve the above object, the present invention provides a work machine, comprising an upper frame, an adapter rotatably connected to the upper frame, and a support link that supports the adapter. A support link including a link, a second link, and a connecting portion that rotatably connects the first link and the second link, and the first link includes a first end connected to the adapter; A second end opposite to the first end, and the second link includes a third end connected to the upper frame and a second end opposite to the third end. And a connecting pin rotatably connecting the second end side of the first link and the fourth end side of the second link by a connection pin, and The link is configured such that the second end and the fourth end abut against the first link. And an extended state in which the second link extends linearly, and a bent state in which the second end portion and the fourth end portion are separated and the first link and the second link bend, The highest position of the adapter supported by the support link in the extended state is higher than a predetermined position, and the highest position of the adapter supported by the support link in the bent state is lower than the predetermined position; The connecting portion provides a work machine characterized in that the connecting pin is disposed so that a rotation shaft of the connection pin is positioned in front of or behind the machine with respect to an axis of the support link in the extended state. .

  In addition, when the work machine is transported, it further includes a first rotation preventing member that maintains the support link in the bent state in the bent state, and the first rotation preventing member includes the first link and Provided on one link of the second link, abuts against the other link of the first link and the second link in the bent state, and the first link and the second link further rotate to the bent side It is preferable to prevent this.

  Further, the work machine further includes a second rotation preventing member that maintains the support link in the extended state in the extended state when the work machine performs work, and the second rotation preventive member is It is preferable to prevent the first link and the second link from rotating to the bending side across the contact portion between the second end and the fourth end.

  According to the present invention, when the work machine is transported, the highest position of the adapter can be kept within the transport regulation height without changing the support link that supports the adapter.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. The perspective view which shows the support link in the expansion | extension state. The perspective view which shows the support link in a bending state. The disassembled perspective view which decomposed | disassembled the support link. The figure which shows a mode that the adapter is supported by the support link in the expansion | extension state. The figure which shows a mode that the adapter is supported by the support link in a bending state. The figure for demonstrating the rotation prevention member which concerns on a modification.

<1. Embodiment>
A working machine according to an embodiment of the present invention will be described with reference to FIGS. Hereinafter, a hydraulic excavator 1 illustrated in FIG. 1 is illustrated as an example of a work machine. In each drawing, the front-rear direction is defined as necessary.

  As shown in FIG. 1, the hydraulic excavator 1 includes a crawler type lower traveling body 2 and an upper swing body 3.

  The upper swing body 3 is mounted on the lower travel body 2 and can swing around the vertical axis with respect to the lower travel body 2.

  As shown in FIG. 1, the upper swing body 3 includes an upper frame 4, an adapter 5 attached to the upper frame 4, a support link 6 that supports the adapter 5, and a boom 7 attached to the adapter 5. ing.

  The adapter 5 is a connecting member that is inserted into a base end portion (also referred to as a boom foot) of the boom 7 and is also referred to as an insert boom or the like. When the adapter 5 is mounted, the mounting position of the boom 7 is increased.

  The support link 6 is a link that supports the adapter 5 by connecting the upper frame 4 and the adapter 5. The lower end portion of the support link 6 is connected to the upper frame 4, and the upper end portion of the support link 6 is connected to the adapter 5.

  As shown in FIGS. 2 and 3, the support link 6 includes a link 61 disposed on the upper side, a link 62 disposed on the lower side, and a connecting portion 63 that rotatably connects the link 61 and the link 62. It is configured with.

  The support link 6 has two states, an extended state ST1 (the state shown in FIG. 2) in which the links 61 and 62 extend linearly, and a bent state ST2 (the state shown in FIG. 3) in which the links 61 and 62 are bent in a square shape. Take a kind of state. The link 61 is an example of a first link according to the present invention, and the link 62 is an example of a second link according to the present invention.

  As shown in FIG. 3, the link 61 has an end 611 connected to the adapter 5 shown in FIG. 1, and an end 612 that contacts the end 622 of the lower link 62 in the extended state ST1.

  The end portion 611 is formed with a pin hole 611 h for inserting a connecting pin used for connection with the adapter 5. The end portion 612 is configured by a flat surface that can come into contact with the end portion 622 of the link 62.

  The link 62 has an end 621 connected to the upper frame 4 shown in FIG. 1, and an end 622 that contacts the end 612 of the upper link 61 in the extended state ST1.

  The end portion 621 is formed with a pin hole 621 h for inserting a connecting pin used for connection with the upper frame 4. The end portion 622 is a flat surface that can contact the end portion 612 of the link 61.

  As shown in FIG. 4, the connection part 63 is provided with connection members 631 and 632 connected by the connection pin 9 (FIG. 5).

  The connecting member 631 is provided on the link 61, and includes a rotating member 661 and a contact member 663 that contacts the lower link 62 in the bent state ST2.

  A pin hole for inserting the connection pin 9 (FIG. 5) is formed in the rotating member 661. The contact member 663 includes a contact surface 663S that contacts the side surface 625 of the link 62 when the links 61 and 62 are bent. The contact surface 663S is a part for maintaining the links 61 and 62 in the bent state ST2 (the state of FIG. 3) in the bent state ST2 when the excavator 1 is transported. That is, the bent state ST2 (the state shown in FIG. 3) is maintained by the presence of the contact surface 663S, and the links 61 and 62 do not further rotate to the bent side. The contact member 663 is an example of a first rotation preventing member according to the present invention.

  The connecting member 632 includes a flat plate 632A connected in parallel to the side surface 623A of the link 62, and a flat plate 632B connected in parallel to the side surface 623B opposite to the side surface 623A.

  As shown in FIG. 4, the flat plates 632A and 632B face each other with a predetermined gap (width of the link 62). In the predetermined gap, when the connecting member 631 and the connecting member 632 are connected, the above-described rotating member 661 is disposed.

  The flat plates 632A and 632B are respectively formed with pin holes for inserting the connection pins 9 (FIG. 5). When the rotating member 661 is disposed between the flat plates 632A and 632B, the pin holes formed in the flat plates 632A and 632B coincide with the pin holes formed in the rotating member 661.

  As shown in FIG. 5, when the support link 6 in the extended state ST <b> 1 supports the adapter 5 (when the excavator 1 performs work), the support link 6 is mounted with a rectangular parallelepiped-shaped rotation preventing member 8. The The rotation preventing member 8 is a member for maintaining the links 61 and 62 in the extended state ST1 (state of FIG. 2) in the extended state ST1 when the excavator 1 performs work. Specifically, the rotation preventing member 8 is disposed at a position straddling the front surface of the link 61 and the front surface of the link 62, and is connected to the links 61 and 62 by two bolts 8A and 8B, respectively. Thereby, the rotation preventing member 8 prevents the support link 6 in the extended state ST1 from rotating to the bending side. The rotation preventing member 8 is an example of a second rotation preventing member according to the present invention, and is configured to be detachable from the links 61 and 62.

  As shown in FIG. 6, when the support link 6 in the bent state ST2 supports the adapter 5 (when the excavator 1 is transported), the rotation preventing member 8 is removed.

  Further, as shown in FIG. 5, the rotation axis of the connection pin 9 is located behind the machine axis 6A of the support link 6 in the extended state ST1. In other words, the connecting portion 63 is provided at a position shifted from the axis 6A of the support link 6 in the extended state ST1 to the rear of the machine.

  Further, the highest position 5H of the adapter 5 supported by the support link 6 in the extended state ST1 is higher than the transportation restriction height HT. That is, the adapter 5 exceeds the transportation regulation height HT, and the excavator 1 cannot be transported.

  On the other hand, as shown in FIG. 6, the highest position 5H of the adapter supported by the support link 6 in the bent state ST2 is lower than the transport restriction height HT. That is, the adapter 5 falls within the transport regulation height HT, and the excavator 1 can be transported. The transport restriction height HT is an example of a predetermined position according to the present invention.

  As described above, according to the present embodiment, the adapter 5 is supported by the same support link 6 during both work and transportation of the excavator 1. Therefore, it is not necessary to replace the main link used at the time of work and the transport link used at the time of transportation as in the conventional case, and the work efficiency at the time of transportation is greatly improved. Further, by sharing the support link 6, the number of parts can be reduced.

  In the present embodiment, the support link 6 includes links 61 and 62 and a connecting portion 63, and takes an extended state ST1 (FIG. 5) and a bent state ST2 (FIG. 6). In the extended state ST1, the highest position 5H of the adapter 5 becomes higher than the transportation restriction height HT, while in the bent state ST2, the highest position 5H of the adapter 5 becomes lower than the transportation restriction height HT. For this reason, it is possible to make the adapter 5 lower than the transport regulation height HT without changing the support link 6 that supports the adapter 5 during transportation.

  Moreover, in this embodiment, as shown in FIG. 5, the connection part 63 is provided in the position which shifted | deviated to the machine back from the axis 6A of the support link 6 in the expansion | extension state ST1. Therefore, the end portion 612 (FIG. 3) of the link 61 and the end portion 622 (FIG. 3) of the link 62 abut, and the support link 6 extends linearly. As a result, the load of the attachment and the load at the time of work are applied straight along the axis 6A of the support link 6, and the load is not applied to the support link 6.

  Moreover, in this embodiment, as shown in FIG. 4, since the connection member 631 is provided with the contact member 663, it is possible to maintain the links 61 and 62 in the bending state ST2 shown in FIG. In addition, since the connecting member 631 is provided on the link 61, a dedicated part for maintaining the bent state ST2 is not required, and there is no need for attachment / detachment.

  Further, in the present embodiment, as shown in FIG. 5, since the rotation preventing member 8 is attached to the support link 6, the links 61 and 62 do not have to be bent at the time of work, and the work can be performed more safely. Is possible.

<2. Modification>
The work machine according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims.

  For example, in the above embodiment, the case where the rotation preventing member 8 (FIG. 5) that can be attached to and detached from the links 61 and 62 is used is illustrated, but the present invention is not limited to this, and the rotation preventing member 80 integrated with the link 62 is used. (FIG. 7) may be used to prevent the support link 6 from bending.

  Specifically, the rotation preventing member 80 is fixed to the side surface 623A of the link 62 in advance, and when the support link 6 is in the extended state ST1, the rotation preventing member 80 is fixed to the link 61 with a bolt 80A. Even when such a rotation preventing member 80 is employed, it is possible to prevent the links 61 and 62 from being bent during work.

  In the above embodiment, as illustrated in FIG. 4, the case where the link 61 provided with the connecting member 631 is disposed on the upper side and the link 62 provided with the connecting member 632 is illustrated on the lower side is illustrated. However, the present invention is not limited to this. Conversely, the link 62 provided with the connecting member 632 may be disposed on the upper side, and the link 61 provided with the connecting member 631 may be disposed on the lower side.

  Moreover, in the said embodiment, as shown in FIG. 5, although the case where the connection part 63 was provided in the position shifted | deviated from the axis 6A of the support link 6 to the machine back was illustrated, it is not limited to this, Axis 6A May be provided at a position shifted forward from the machine.

  As described above, the work machine according to the present invention is suitable for an adapter specification machine to which an adapter is attached.

1 Hydraulic excavator, 2 Lower traveling body, 3 Upper turning body, 4 Upper frame,
5 Adapter, 6 Support link, 6A Axis, 7 Boom, 8 Anti-rotation member,
8A, 8B bolt, 9 connection pin, 61, 62 link, 63 connecting part,
80 rotation prevention member, 623A side surface, 623B side surface, 625 side surface,
631,632 connecting member, 632A, 632B flat plate, 663S contact surface,
661 Rotating member, 663 Abutting member, ST1 extended state, ST2 bent state

Claims (3)

A working machine,
An upper frame,
An adapter rotatably connected to the upper frame;
A support link that supports the adapter and includes a first link, a second link, and a connecting portion that rotatably connects the first link and the second link;
With
The first link has a first end connected to the adapter and a second end opposite to the first end;
The second link has a third end connected to the upper frame, and a fourth end opposite to the third end,
The connecting portion connects the second end side of the first link and the fourth end side of the second link so as to be rotatable by a connection pin,
The support link includes an extended state in which the second end and the fourth end abut and the first link and the second link extend linearly, and the second end and the fourth end. A bent state in which the first link and the second link are bent apart from each other,
The highest position of the adapter supported by the support link in the extended state is higher than a predetermined position,
The highest position of the adapter supported by the support link in the bent state is lower than the predetermined position,
The work machine is characterized in that the connecting portion is arranged such that a rotation shaft of the connection pin is located in front of or behind the machine with respect to an axis of the support link in the extended state. A first anti-rotation member for maintaining the support link in the bent state in the bent state when the work machine is transported;
The first rotation preventing member is provided on one of the first link and the second link, and in contact with the other link of the first link and the second link in the bent state, 2. The work machine according to claim 1, wherein the one link and the second link are prevented from further rotating toward the bending side. A second rotation preventing member for maintaining the support link in the extended state in the extended state when the work machine performs work;
The second rotation preventing member is configured to rotate the first link and the second link to the bending side across the contact portion between the second end and the fourth end in the extended state. The work machine according to claim 1, wherein the work machine is blocked.

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