JP6037565B2 - Crawler work machine - Google Patents

Description

  The present invention relates to a work machine with a crawler.

  2. Description of the Related Art A crawler working machine capable of extending and reducing the distance between a pair of crawler-type left and right traveling devices is known. Thus, in the work machine with a crawler which can change the space | interval of a traveling apparatus, the extension beam which can be expanded and folded by the front-end | tip of the axle extended in the left-right direction from a car body is provided (for example, refer patent document 1).

JP 2012-148626 A

  When an extension beam that can be extended and folded at the tip of the axle is provided as in the working machine described in the above-mentioned patent document, the extension of the axle and the extension are prevented so that the extended extension beam is not undesirably folded. A fixing member such as a pin or a plate is inserted between the beam and the beam.

  When the extension beam is folded, the fixing member is removed from between the axle tip and the extension beam. The removed fixing member is placed, for example, on a holding portion of the fixing member provided on the side frame of the traveling device. However, if vibration is applied by traveling in this state, the fixed member placed by the vibration may jump up and fall off.

(1) A work machine with a crawler according to a first aspect of the present invention includes a car body, an axle extending in the width direction from the car body, an upper turning body that is turnably mounted on the car body, and a tip of the axle. It has an extension beam that is pivotally supported and can be rotated between two positions of an extended position and a folded position with respect to the axle, a side frame, a crawler belt, and a traveling drive device, and is at the tip of the axle or at the extended position. A pair of crawler-type left and right traveling devices connected to the tip of the extension beam, a telescopic device that moves the traveling device along the extension direction of the axle, and the extension beam is fixed at the extension position between the extension beam and the axle. An extension beam fixing member that is provided on a side surface of the side frame and is removed from between the extension beam and the axle when inserted from above. A fixing member holding portion that engages and holds, and the fixing member holding portion is positioned below the extension beam in the folding position, and is in a folding position with the upper surface of the extension beam fixing member held by the fixing member holding portion. The extension beam fixing member is prevented from falling off the fixing member holding portion by facing the lower surface of a certain extension beam.
(2) A work machine with a crawler according to a second aspect of the present invention includes a car body, an axle extending in the width direction from the car body, an upper turning body that is turnably mounted on the car body, and a tip of the axle. An extension beam that is pivotally supported and can be rotated between two positions: an extended position that extends along the extension direction of the axle and a folding position that is orthogonal to the extension direction of the axle, a side frame, and a crawler belt And a pair of crawler-type left and right traveling devices connected to the front end of the axle or the extended beam front end in the extended position, and a telescopic mechanism for moving the traveling device along the extending direction of the axle The device, the extension beam fixing member for fixing the extension beam in the extended position between the extension beam and the axle, and provided on the side surface of the side frame, are removed from between the extension beam and the axle. When the extension beam fixing member is inserted from above, a fixing member holding portion that engages and holds the extension beam fixing member is provided, and the fixing member holding portion is located below the extension beam in the folding position, and is fixed by the fixing member holding portion. The distance between the upper surface of the held extension beam fixing member and the lower surface of the extension beam in the folded position is such that the extension beam fixing member moves upward to release the engagement between the extension beam fixing member and the fixing member holding portion. It is characterized by being shorter than the distance.
(3) A work machine with a crawler according to a third aspect of the invention includes a car body, an axle extending in the width direction from the car body, an upper turning body that is turnably mounted on the car body, and a tip of the axle. It has an extension beam that is pivotally supported and can be rotated between two positions of an extended position and a folded position with respect to the axle, a side frame, a crawler belt, and a traveling drive device, and is at the tip of the axle or at the extended position. A pair of crawler-type left and right traveling devices connected to the tip of the extension beam, a telescopic device that moves the traveling device along the extension direction of the axle, and the extension beam is fixed at the extension position between the extension beam and the axle. The extension beam fixing member to be engaged with the extension beam fixing member provided on the side surface of the extension beam and removed from between the extension beam and the axle is inserted from above. A fixing member holding portion, and a fixing member pop-out preventing portion provided on the side surface of the side frame and above the fixing member holding portion in a state where the extension beam is in the folded position. The extension beam fixing member is prevented from falling off the fixing member holding portion by facing the lower surface and the upper surface of the extension beam fixing member held by the fixing member holding portion in a state where the extension beam is in the folded position. And
(4) According to a fourth aspect of the present invention, in the work machine with a crawler according to any one of the first to third aspects, the tip of the axle and the end of the extension beam facing the tip of the axle in the extended position. A gap is provided between them, and the extension beam is fixed at the extended position when the extension beam fixing member is inserted into the gap, and can be rotated toward the folding position when the extension beam fixing member is removed from the gap. It is characterized by.
(5) The invention according to claim 5 is the work machine with a crawler according to any one of claims 1 to 4, wherein two axles are provided on each of the left and right sides in the vehicle width direction, and the extension beam fixing member is , A total of four are required for each of the pair of left and right traveling devices, and one fixing member holding portion is provided for each of the pair of left and right traveling devices. The extended beam fixing member is held.

  According to the present invention, the fixing member holding portion is configured to be positioned below the extended beam in the folding position. Accordingly, the loss of the extension beam rotation stop plate can be prevented, so that it is possible to prevent a problem that the extension beam cannot be fixed due to the loss of the extension beam fixing member and the operation is interrupted, thereby preventing a reduction in work efficiency.

1 is an external side view of a crawler crane to which the present invention is applied. It is a perspective view explaining the structure of a lower traveling body. It is a perspective view near the front-end | tip of an axle. It is a perspective view of the below-mentioned traveling device attached to the tip of an axle. It is a principal part enlarged view of FIG. It is an exploded view of the extension beam concerning a fixed pin. It is a top view of a car body, an axle, and an extension beam. It is a figure explaining the procedure at the time of fixing an extension beam in an extension position. It is a perspective view which shows the extension beam and traveling device which were positioned by the stopper pin and the stopper pin contact part. FIG. 10 is a sectional view on a vertical plane along the axle extending direction in FIG. 9. It is sectional drawing in the horizontal surface which shows the positional relationship of the plate for positioning, a fixing pin, and a stopper pin. It is a figure explaining the procedure at the time of returning an extension beam to a folding position. It is a figure explaining the procedure at the time of returning an extension beam to a folding position. It is the figure which wrote together the top view of an extension beam rotation stop plate, the front view, and sectional drawing in the AA cross section of a front view. It is a top view which shows the arrangement | positioning position of a rotation stop plate holding bracket. It is a schematic diagram explaining the position which provides a rotation stop plate holding bracket. It is a side view of the traveling apparatus which shows the state which fixed the extension beam in the folding position. FIG. 6 is a perspective view showing the vicinity of the front end of the axle according to the second embodiment of the present invention. In FIG. 18, it is a figure explaining the procedure at the time of returning an extension beam to a folding position. In FIG. 19, it is a figure explaining the procedure at the time of returning an extension beam to a folding position. In FIG. 20, it is sectional drawing for demonstrating prevention of the rotation stop plate jumping out. It is a figure which shows a modification. It is a figure which shows a modification. It is a figure which shows a modification.

[Embodiment 1]
With reference to FIGS. 1-17, one Embodiment of the working machine with a crawler by this invention is described. FIG. 1 is an external side view of a crawler crane as an example of a work machine with a crawler according to the present invention. The crawler crane (hereinafter simply referred to as a crane) is rotated by a lower traveling body 1, an upper revolving body 3 that is turnable on the lower traveling body 1 via a swivel wheel 2, and an upper revolving body 3. The boom 4 is pivotally supported. The upper swing body 3 is equipped with a hoisting drum 5 that is a winch drum for hoisting and a hoisting drum 6 that is a hoisting winch drum. A hoisting rope 5 a is wound around the hoisting drum 5, and the hoisting rope 5 a is wound or fed out by driving of the hoisting drum 5, and the hook 7 moves up and down. A hoisting rope 6 a is wound around the hoisting drum 6, and the hoisting rope 6 a is wound or fed out by driving of the hoisting drum 6, and the boom 4 is raised and lowered.

  The hoisting drum 5 is driven by a hoisting hydraulic motor (not shown), and the hoisting drum 6 is driven by an hoisting hydraulic motor (not shown). The rotation of these hydraulic motors can be braked by a brake device (not shown).

  FIG. 2 is a perspective view illustrating the structure of the lower traveling body 1, and FIG. 3 is a perspective view of the vicinity of the tip of the axle 105. FIG. 4 is a perspective view of a traveling device 108, which will be described later, attached to the tip of the axle 105, and FIG. 5 is an enlarged view of a main part of FIG. The lower traveling body 1 is provided with a car body 106 and a total of four axles 105 extending in the left-right direction at the front and rear portions of the car body 106, respectively. An extension beam 130 is pivotally supported by a connecting pin 115 at the tip of each axle 105.

  A jack-up device 104 for jacking up the lower traveling body 1 is provided at the front and rear of the car body 106. On the side surface of the car body 106, a crawler expansion / contraction device 107 is provided for expanding and reducing a distance between a pair of travel devices 108 described later.

  A crawler type traveling device (crawler) 108 is attached to each of the right front and right rear axles 105 and the left front and left rear axles 105. The traveling device 108 is wound around the side frame 109, the traveling drive device 114, the driven wheel 111, the upper roller 112, the lower roller 113, and the driving wheel and the driven wheel 111 of the traveling drive device 114. Crawler belt (crawler belt) 110.

  The side frame 109 is provided with two fitting portions 109a into which the axle 105 is fitted. A positioning plate 901 for determining the relative position between the extension beam 130 and the side frame 109 is provided below the fitting portion 109a. The side frame 109 is provided with a rotation stop plate holding bracket 930 and an extension beam fixing bracket 951 which will be described later. Details of the positioning plate 901 and the rotation stop plate holding bracket 930 will be described later. The extension beam fixing bracket 951 is a bracket for fixing the extension beam 130 in a folded state along the extending direction of the side frame 109, and has an insertion hole 951a through which a fixing pin 135 described later is inserted.

  The travel drive device 114 includes drive wheels (sprockets) that are rotatably supported near the rear ends of the side frames 109, and travel hydraulic motors that drive the drive wheels.

  As described above, the extension beam 130 is pivotally supported at the tip of each axle 105 by the connecting pin 115 inserted along the vertical direction. The extension beam 130 includes a pin insertion part 131, an upper plate 132, a lower plate 133, a vertical plate 134, a fixing pin 135, and a stopper pin 136. The pin insertion part 131 is a part that is pivotally supported by the distal end of the axle 105 through which the connecting pin 115 is inserted. The upper plate 132 is a thick plate member that extends laterally from the upper part of the pin insertion part 131. The lower plate 133 is a thick plate member that extends laterally from the lower portion of the pin insertion portion 131. The vertical plate 134 is a member that connects the pin insertion part 131, the upper plate 132, and the lower plate 133. When the extension beam 130 is viewed from above, the end near the insertion portion of the connecting pin 115 is referred to as the base end side, and the end near the portion where the fixing pin 135 and the stopper pin 136 are provided is referred to as the front end side. (Refer to FIGS. 3 and 6).

  FIG. 6 is an exploded view of the extension beam 130 according to the fixing pin 135. The fixing pin 135 is a pin that fixes the extension beam 130 and the side frame 109. The fixing pin 135 can be attached to and detached from a through hole 133 a provided on the distal end side of the lower plate 133. The fixing pin 135 is inserted into the through-hole 133a and is prevented from coming off by the locking pin 137 and the locking pin 138. In a state where the fixing pin 135 is inserted and fixed through the through hole 133 a, the lower end protrudes from the lower surface of the lower plate 133 by a predetermined distance.

  The stopper pin 136 is a pin for determining a relative position between the extension beam 130 and the side frame 109 when the extension beam 130 and the side frame 109 are fixed. A groove is provided on the outer peripheral surface near the upper end of the stopper pin 136 along the circumferential direction. The stopper pin 136 inserted into the through hole 133b provided on the tip side of the lower plate 133 inserts a plate-like component (stop plate) from the radially outer side of the stopper pin 136 into the groove, and this The stopper plate is fixed to the lower plate 133 by fixing it to the upper surface of the lower plate 133 with a bolt or the like. When the stopper pin 136 is inserted through the through-hole 133b and fixed, the lower end protrudes from the lower surface of the lower plate 133 by a predetermined distance. Positioning by the stopper pin 136 and fixing by the fixing pin 135 will be described later.

--Extension of extension beam 130 ---
In order to fix the extension beam 130 in a state where it extends toward the side, as shown in FIG. 3, the extension beam 130 is connected so as to extend laterally (extending direction of the axle 105) at the tip of the axle 105. The pin 115 is turned around. As shown in FIG. 7, the extension beam 130 rotates between two positions: an extended position extending along the extension direction of the axle 105 and a folding position orthogonal to the extension direction of the axle 105. Is possible. When the size of the rotation range between the above-described two positions of the extension beam 130 is expressed by an angle θ, θ is approximately 90 degrees.

  When the traveling device 108 is attached to the extension beam 130, if the extension beam 130 is folded, the extension beam 130 is extended and fixed prior to the attachment of the traveling device 108. Specifically, among the four extension beams 130 illustrated in FIG. 7, from the state (folding position) drawn with a two-dot chain line, such as the extension beam 130 attached to the axle 105 at the lower right of the page. The extension beam 130 is rotated so as to shift to a state (extension position) drawn by a solid line, and is extended at the tip of the axle 105.

  If the extension beam 130 is simply extended at the tip of the axle 105, the extension beam 130 rotates around the connecting pin 115 when an external force is applied. Therefore, as shown in FIG. 8, the extension beam rotation stop plate 300 held by a rotation stop plate holding bracket 930, which will be described later, is connected to the tip end 105a of the axle 105 and the base end portion 132a of the upper plate 132 of the extension beam 130. Insert into the gap between. Thereby, the extension beam 130 is fixed to the axle 105.

  For example, as shown in FIG. 8, when the traveling device 108 is already attached to the axle 105, the crawler telescopic device 107 causes the traveling device 108 to be moved from the axle 105 toward the extension beam 130 as shown in FIG. Extrude laterally outward. FIG. 9 is a perspective view showing the extended beam 130 and the traveling device 108 positioned by the stopper pin 136 and the stopper pin contact portion 902 (see FIGS. 5 and 11) provided on the positioning plate 901, as will be described later. FIG. FIG. 10 is a sectional view in a vertical plane along the extending direction of the axle 105 in FIG. 9. FIG. 11 is a cross-sectional view in the horizontal plane showing the positional relationship between the positioning plate 901, the fixing pin 135 and the stopper pin 136.

  When the traveling device 108 is moved along the direction in which the axle 105 extends, the lower traveling body 1 may be lifted from the ground using the jack-up device 104.

  As shown in FIG. 11, the positioning plate 901 includes a guide for the stopper pin 136 of the extension beam 130 approaching from the lateral outer side of the lower traveling body 1 and a stopper for restricting the lateral movement of the stopper pin 136. A pin contact portion 902 is provided. The positioning plate 901 is provided with a fixing pin insertion hole 903 through which the fixing pin 135 is inserted.

  As described above, the stopper pin 136 protrudes below the lower surface of the lower plate 133 of the extension beam 130. Therefore, when the traveling device 108 is pushed out laterally outward by the crawler expansion and contraction device 107, the stopper pin 136 that protrudes downward from the lower surface of the lower plate 133 is a stopper pin contact portion 902 provided on the positioning plate 901. To contact the side inner surface of the stopper pin contact portion 902. When the stopper pin 136 and the stopper pin contact portion 902 contact each other, the horizontal position of the fixing pin insertion hole 903 provided in the positioning plate 901 and the through hole 133a of the lower plate 133 substantially coincide.

  When the fixing pin 135 is inserted into the through hole 133a in this state, the lower portion of the fixing pin 135 is inserted into the fixing pin insertion hole 903 of the positioning plate 901 as shown in FIG. Thereby, the traveling device 108 is fixed to the extension beam 130. Note that after the fixing pin 135 is inserted into the through hole 133a and the fixing pin insertion hole 903, the fixing pin 135 is prevented from coming off by the fixing pin 137 and the locking pin 138 (see FIG. 9).

--- Folding extension beam 130 ---
In order to fold the extension beam 130 extended to the side to the folding position, the extension beam 130 may be folded by a work procedure opposite to the work procedure for extending the extension beam. That is, the fixing pin 137 and the lock pin 138 are removed, and the fixing pin 135 is removed from the through hole 133a (see FIG. 9). Thereby, fixation of the traveling apparatus 108 and the extension beam 130 is cancelled | released. When the traveling device 108 is moved along the direction in which the axle 105 extends, the lower traveling body 1 may be lifted from the ground using the jack-up device 104.

  For example, when the traveling device 108 is attached to the axle 105, the traveling device 108 is pulled inwardly by the crawler expansion and contraction device 107. Then, as shown in FIG. 12, the extension beam rotation stop plate 300 inserted in the gap between the distal end 105a of the axle 105 and the proximal end portion 132a of the upper plate 132 of the extension beam 130 is removed. The removed extended beam rotation stop plate 300 is held by a rotation stop plate holding bracket 930 provided on the side surface of the side frame 109.

  And as shown in FIG. 13, the extension beam 130 is rotated to a folding position. In the folded position, the horizontal positions of the insertion hole 951a of the extension beam fixing bracket 951 and the through hole 133a of the lower plate 133 substantially coincide. When the fixing pin 135 is inserted into the through hole 133a in this state, the lower portion of the fixing pin 135 is inserted into the insertion hole 951a of the extension beam fixing bracket 951. Thereby, the extension beam 130 is fixed to the side surface of the side frame 109. That is, the extension beam 130 is fixed at the folding position. The fixing pin 135 is inserted into the through hole 133a and the insertion hole 951a, and then the fixing pin 135 is prevented from coming off by the set pin 137 and the lock pin 138.

--- About extension beam rotation stop plate 300 ---
FIG. 14 is a view in which a plan view, a front view, and a cross-sectional view of the front view taken along the line AA are shown together. The extended beam rotation stop plate 300 includes a plate main body 301 extending in the left-right direction on the paper surface of FIG. 14, and projecting portions 305 projecting downward from the paper surface at both ends of the plate main body 301 in the plan view of FIG. 14. In the plate body 301, the lower beam 301a is notched so that the extended beam rotation stop plate 300 can be easily inserted into the gap between the distal end 105a of the axle 105 and the proximal end 132a of the upper plate 132 of the extended beam 130. ing. The protruding portion 305 has opposing surfaces 305 a that are surfaces facing each other at both ends of the plate body 301.

  For example, as shown in FIG. 6, the extension beam rotation stop plate 300 is arranged so that the projection 305 faces the distal end side of the extension beam 130 and the proximal end of the distal end 105 a of the axle 105 and the upper plate 132 of the extension beam 130. It is inserted into the gap between the part 132a. As a result, the opposing surfaces 305a of the projecting portions 305 facing each other at both ends of the plate body 301 sandwich the upper plate 132, and the extended beam rotation stop plate 300 has a base between the distal end 105a of the axle 105 and the upper plate 132 of the extended beam 130. It enters into the gap between the end side end portion 132a and is fixed.

--- About rotation stop plate holding bracket 930 ---
The rotation stop plate holding bracket 930 is a bracket that holds the extension beam rotation stop plate 300 removed from the gap between the distal end 105a of the axle 105 and the proximal end portion 132a of the upper plate 132 of the extension beam 130. As shown in FIGS. 4, 5, 15, and 17, the rotation stop plate holding bracket 930 is disposed on the side surface of the side frame 109 so as to be positioned below the lower plate 133 of the extension beam 130 fixed to the side surface of the side frame 109. Is provided. The rotation stop plate holding bracket 930 has a substantially L-shaped cross section when viewed along the extending direction of the side frame 109.

  As shown in FIGS. 5, 16, and 17, the extended beam rotation stop plate 300 is placed on the rotation stop plate holding bracket 930 with the protrusion 305 facing downward. Note that two extension beam rotation stop plates 300 can be placed side by side on the rotation stop plate holding bracket 930. Therefore, only one rotation stop plate holding bracket 930 needs to be provided for each traveling device 108.

  Since the extension beam rotation stop plate 300 is merely placed on the rotation stop plate holding bracket 930, there is a possibility that the extension beam rotation stop plate 300 may fall off the rotation stop plate holding bracket 930 due to vibration caused by traveling or transportation. Therefore, in the present embodiment, the upper surface of the extension beam rotation stop plate 300 placed on the rotation stop plate holding bracket 930 and the lower surface 133c of the lower plate 133 of the extension beam 130 are configured to face each other.

  FIG. 16 is a schematic diagram for explaining a position where the rotation stop plate holding bracket 930 is provided. In order for the extended beam rotation stop plate 300 not to fall off the rotation stop plate holding bracket 930, both of the following conditions (a) and (b) must be satisfied. In the present embodiment, the following conditions (a) and (b) are both satisfied.

(A) Let A be the distance between the upper end surface 932 of the part folded back upward of the rotation stop plate holding bracket 930 and the lower surface 133c of the lower plate 133 of the extension beam 130. The distance between the mounting surface 931 of the rotation stop plate holding bracket 930 and the illustrated upper surface 300a of the extended beam rotation stop plate 300 in FIG. In order that the extended beam rotation stop plate 300 does not fall out before the paper surface in FIG. 16, A <B must be satisfied.

  In other words, the distance h between the upper surface 300a of the extension beam rotation stop plate 300 and the lower surface 133c of the extension beam 130 in the folded position is extended so that the extension beam rotation stop plate 300 does not drop out before the paper surface in FIG. It must be shorter than the upward movement distance H1 of the extended beam rotation stop plate 300 required for releasing the engagement between the beam rotation stop plate 300 and the rotation stop plate holding bracket 930 (h <H1).

Here, h = C−B and H1 = C−A. Therefore, h <H1 can be expressed as the following equation (1).
h <H1
CB <CA
A <B (1)
That is, as described above.

(B) The distance between the mounting surface 931 of the rotation stop plate holding bracket 930 and the lower surface 133c of the lower plate 133 of the extension beam 130 is C. The distance between the upper surface 300a of the extended beam rotation stop plate 300 and the lower surface 305b shown in FIG. In order to prevent the extended beam rotation stop plate 300 from falling off in the left-right direction in FIG. 16, C <D must be satisfied.

  In other words, in order to prevent the extension beam rotation stop plate 300 from falling off in the left-right direction in FIG. 16, the distance h between the upper surface 300a of the extension beam rotation stop plate 300 and the lower surface 133c of the extension beam 130 at the folding position is It must be shorter than the upward movement distance H2 of the extension beam rotation stop plate 300 required for releasing the engagement between the extension beam rotation stop plate 300 and the rotation stop plate holding bracket 930 (h <H2).

Here, h = C−B and H2 = D−B. Therefore, h <H2 can be expressed as the following equation (2).
h <H2
CB <DB
C <D (2)
That is, as described above.

In the present embodiment described above, the following operational effects are obtained.
(1) The rotation stop plate holding bracket 930 is configured to be positioned below the lower plate 133 of the extension beam 130 folded along the extending direction of the side frame 109. As a result, the extension beam rotation stop plate 300 placed on the rotation stop plate holding bracket 930 can be prevented from dropping from the rotation stop plate holding bracket 930 by the lower plate 133 of the extension beam 130. Therefore, the loss of the extension beam rotation stop plate 300 can be prevented, so that the problem that the extension beam 130 cannot be fixed and the operation is interrupted due to the loss of the extension beam rotation stop plate 300 is prevented, and the work efficiency is lowered. Can be prevented.

(2) The anti-rotation plate holding bracket 930 may be configured to be positioned below the lower plate 133 of the extension beam 130 folded along the extending direction of the side frame 109. In addition, since the above-described conditions (a) and (b) may be satisfied, the accuracy of the position where the rotation stop plate holding bracket 930 is provided need not be increased more than necessary. Therefore, an increase in cost can be suppressed.

[Embodiment 2]
A second embodiment of the present invention will be described with reference to FIGS.
FIG. 18 is a perspective view of the vicinity of the tip of the axle as the second embodiment, FIG. 19 is a diagram for explaining a procedure for returning the extension beam to the folding position in FIG. 18, and FIG. FIG. 3 is a diagram for explaining a procedure for returning the extension beam to the folding position. FIG. 21 is a cross-sectional view for explaining prevention of the rotation stop plate from popping out in FIG.
18, 19, and 20 described below correspond to FIGS. 3, 12, and 13 of the first embodiment, respectively, and therefore should be referred to as necessary.

One of the differences between the second embodiment and the first embodiment is that in the first embodiment, the anti-rotation plate holding bracket 930 provided on the side surface of the side frame 109 is removed. This is a point that the plate 134 is provided as a rotation stop plate holding bracket 960. Another point that the second embodiment differs from the first embodiment is that a rotation stop plate pop-out prevention plate 970 is provided on the side surface of the side frame 109.
As shown in FIGS. 18 and 21, the anti-rotation plate holding bracket 960 according to the second embodiment has a side opposite to the side surface of the side frame 109 in a state where the extension beam 130 is rotated to the folding position. It is provided on the vertical plate 134 of the extension beam 130. The anti-rotation plate holding bracket 960 has the same structure as the anti-rotation plate holding bracket 930 of the first embodiment.

  The anti-rotation plate pop-out prevention plate 970 is provided on the side surface of the side frame 109 so as to protrude above the anti-rotation plate holding bracket 960 when the extension beam is in the folded position as shown in FIGS. It has been. The rotation stop plate pop-out prevention plate 970 is a flat plate member.

When the extension beam 130 extended at the tip of the axle 105 is rotated to the folding position, as shown in FIG. 19, the tip end 105 a of the axle 105 and the proximal end portion 132 a of the upper plate 132 of the extension beam 130. The extension beam rotation stop plate 300 inserted in the gap between the two is removed. The removed extension beam rotation stop plate 300 is held by a rotation stop plate holding bracket 960 provided on the vertical plate 134 of the extension beam 130.
As shown in FIG. 20, the rotation stop plate holding bracket 960 is rotated to the folding position. As described in the first embodiment, in the folding position, the horizontal positions of the insertion hole 951a of the extension beam fixing bracket 951 and the through hole 133a of the lower plate 133 substantially coincide with each other, so that the fixing pin 135 is connected to the through hole 133a. The extension beam 130 is fixed to the side surface of the side frame 109 through the insertion hole 951a.

FIG. 21 shows a cross-sectional view of the state in which the extension beam 130 is fixed to the side surface of the side frame 109.
The anti-rotation plate pop-out prevention plate 970 provided on the side surface of the side frame 109 is provided above the anti-rotation plate holding bracket 960 provided on the vertical plate 134 of the extension beam 130 and separated from the anti-rotation plate holding bracket 960. It has been. The anti-rotation plate pop-out prevention plate 970 protrudes to a position facing the extended beam anti-rotation plate 300 held by the anti-rotation plate holding bracket 960. For this reason, it is possible to prevent the extended beam rotation stop plate 300 from falling off the rotation stop plate holding bracket 960.
That is, in this state, that is, in a state where the extension beam 130 is folded and attached to the side frame 109, even when the traveling drive device 114 is driven and the crane vibrates, the rotation stop plate pop-out prevention plate 970 is used. The extended beam rotation stop plate 300 can be prevented from falling off.

  Conditions for preventing the extension beam rotation stop plate 300 from falling off by the rotation stop plate pop-out prevention plate 970 and the rotation stop plate holding bracket 960 are the same as those in the first embodiment (a) and (b). However, in the second embodiment, the rotation stop plate holding bracket 930 and the lower plate 133 of the extension beam 130 in the first embodiment are replaced with a rotation stop plate holding bracket 960 and a rotation stop plate pop-out prevention plate 970, respectively.

In the second embodiment, the same effect as in the first embodiment can be obtained.
In addition, in the second embodiment, when the extension beam 130 is folded and attached to the side frame 109 and traveled and transported in the reduced state of the crawler, the extension beam rotation stop plate 300 holds the rotation stop plate even if there is vibration or impact. It is possible to prevent the bracket 960 from falling off.

---- Modified example ---
(1) In the above description, the anti-rotation plate holding bracket 930 is configured such that the cross section when viewed along the extending direction of the side frame 109 is substantially L-shaped, but the present invention is not limited thereto. Not. In other words, the shape of the rotation stop plate holding bracket 930 described above is an example, and may be a shape other than the shape described above. For example, as shown in FIG. 22, a box-shaped rotation stop plate holding bracket 940 having an open top surface may be provided. Moreover, as shown in FIG. 23, you may make it provide the rotation-stop plate holding bracket 950 which consists of two substantially U-shaped plate-shaped members. In the rotation stop plate holding bracket 950, the extended beam rotation stop plate 300 is held by a U-shaped inner portion 951.

(2) In the above description, the shape of the extended beam rotation stop plate 300 is as shown in FIG. 14, but the present invention is not limited to this. That is, the shape of the extended beam rotation stop plate 300 described above is an example, and may be a shape other than the shape described above. For example, as shown in FIG. 24, an inverted U-shaped extended beam rotation stop plate 310 may be used. FIG. 24 is a view in which a front view and a side view of the extension beam rotation stop plate 310 are shown. The extended beam rotation stop plate 310 has lower projecting portions 315 projecting downward on the paper surface at both ends of the plate body 311 extending in the left-right direction on the paper surface of the front view in FIG. The lower protrusion 315 has opposing surfaces 315 a that are surfaces facing each other at both ends of the plate body 311.

  When the extension beam rotation stop plate 310 is inserted into the gap between the distal end 105a of the axle 105 and the proximal end 132a of the upper plate 132 of the extension beam 130, the lower protrusion 315 is directed downward. insert. As a result, the opposing surface 315a sandwiches a portion 131a (see FIGS. 12 and 13) extending from the pin insertion portion 131 to the tip side below the upper plate, so that the extended beam rotation stop plate 310 is fixed.

(3) In the above description, a crawler crane as an example of a work machine with a crawler has been described. However, the present invention is not limited to this, and a crawler with a crawler such as a hydraulic excavator with a crawler or a work machine with a crawler for recycling may be used. Applicable to various work machines.

(4) In the above description, the above conditions (a) and (b) are both satisfied, but the present invention is not limited to this. For example, in the first embodiment, if the rotation stop plate holding bracket 930 is configured to be positioned below the lower plate 133 of the extension beam 130 folded along the extending direction of the side frame 109, the above condition (a ) And (b), even if either one of them is not satisfied, the possibility that the extended beam rotation stop plate 300 falls off the rotation stop plate holding bracket 930 can be greatly reduced. If the rotation stop plate holding bracket 930 is configured to be positioned below the lower plate 133 of the extension beam 130 folded along the extending direction of the side frame 109, the above conditions (a) and (b) are satisfied. Even if both of these are not satisfied, if the deviation from the above conditions (a) and (b) is not large, the possibility that the extended beam rotation stop plate 300 may fall off the rotation stop plate holding bracket 930 is greatly increased. Can be reduced.
(5) You may combine each embodiment and modification which were mentioned above, respectively.

The present invention is not limited to the above-described embodiment, and includes a car body, an axle extending in the width direction from the car body, an upper swing body that is turnably mounted on the car body, An extension beam that is pivotally supported at the front end of the axle and is rotatable between two positions of an extended position and a folded position with respect to the axle, a side frame, a crawler belt, and a driving device for traveling, A pair of crawler-type traveling devices connected to the distal end of the extension beam in the extended position, an extension device that moves the traveling device along the extending direction of the axle, and the extension beam between the extension beam and the axle. When the extension beam fixing member that is fixed at the extended position and the extension beam fixing member that is provided on the side surface of the side frame and is removed from between the extension beam and the axle are inserted from above. A fixing member holding part that engages and holds the fixing member holding part. The fixing member holding part is positioned below the extension beam at the folding position, and is folded with the upper surface of the extension beam fixing member held by the fixing member holding part. It includes a work machine with a crawler having various structures, wherein the extension beam fixing member is prevented from falling off the fixing member holding portion by facing the lower surface of the extension beam at a position.
Further, the present invention is not limited to the above-described embodiment, and includes a car body, an axle extending in the width direction from the car body, an upper swing body that is turnably mounted on the car body, An extension beam that is pivotally supported at the tip of the axle and is rotatable between two positions: an extended position that extends along the extension direction of the axle; and a folding position that is orthogonal to the extension direction of the axle; A pair of crawler-type left and right traveling devices connected to the front end of the axle or the extended beam front end in the extended position, and a traveling device along the direction in which the axle extends. Telescopic device to be moved, an extension beam fixing member for fixing the extension beam in the extended position between the extension beam and the axle, and provided on the side surface of the side frame, and is taken from between the extension beam and the axle. When the removed extension beam fixing member is inserted from above, a fixing member holding portion that engages and holds the extension beam fixing member is provided. The fixing member holding portion is positioned below the extension beam in the folded position, and holds the fixing member. The distance between the upper surface of the extension beam fixing member held by the portion and the lower surface of the extension beam at the folding position is above the extension beam fixing member necessary for releasing the engagement between the extension beam fixing member and the fixing member holding portion. It includes a work machine with a crawler having various structures, which is characterized by being shorter than the moving distance.
Furthermore, the present invention is not limited to the above-described embodiment, and includes a car body, an axle extending in the width direction from the car body, an upper swing body that is turnably mounted on the car body, An extension beam that is pivotally supported at the front end of the axle and is rotatable between two positions of an extended position and a folded position with respect to the axle, a side frame, a crawler belt, and a driving device for traveling, A pair of crawler-type traveling devices connected to the distal end of the extension beam in the extended position, an extension device that moves the traveling device along the extending direction of the axle, and the extension beam between the extension beam and the axle. When the extension beam fixing member that is fixed at the extension position and the extension beam fixing member that is provided on the side surface of the extension beam and is removed from between the extension beam and the axle are inserted from above, A fixing member holding portion that engages and holds the fixing member, and a fixing member pop-out prevention portion provided on the side surface of the side frame above the fixing member holding portion in a state where the extension beam is in the folded position. The extension beam fixing member is prevented from falling off the fixing member holding portion by making the bottom surface of the pop-out prevention portion face the upper surface of the extension beam fixing member held by the fixing member holding portion with the extension beam in the folded position. And a crawler work machine having various structures.

DESCRIPTION OF SYMBOLS 1 Lower traveling body, 3 Upper turning body, 105 Axle, 106 Car body, 107 Crawler expansion / contraction device, 108 Traveling device (crawler), 130 Extension beam, 300, 310 Extension beam rotation stop plate, 930, 940, 950, 960 Rotation Stop plate holding bracket, 970 Anti-rotation plate pop-out prevention plate

Claims (5)

Car body,
An axle extending in the width direction from the car body;
An upper swing body mounted on the car body so as to be pivotable;
An extension beam pivotally supported at the tip of the axle and rotatable between two positions, an extended position and a folded position with respect to the axle;
A pair of crawler-type left and right traveling devices connected to the front end of the axle or the extended beam front end in the extended position, having a side frame, a crawler belt, and a traveling drive device;
A telescopic device for moving the traveling device along the extending direction of the axle;
An extension beam fixing member for fixing the extension beam at the extended position between the extension beam and the axle;
A fixing member holding portion that is provided on a side surface of the side frame, and is engaged with and held by the extension beam fixing member removed from between the extension beam and the axle from above;
The fixing member holding portion is positioned below the extension beam at the folding position, and includes an upper surface of the extension beam fixing member held by the fixing member holding portion and a lower surface of the extension beam at the folding position. A work machine with a crawler, characterized in that the extension beam fixing member is prevented from falling off from the fixing member holding portion by being opposed to each other. Car body,
An axle extending in the width direction from the car body;
An upper swing body mounted on the car body so as to be pivotable;
An extension that is pivotally supported at the front end of the axle and is rotatable between two positions: an extended position that extends along the extending direction of the axle and a folding position that is orthogonal to the extending direction of the axle. With the beam,
A pair of crawler-type left and right traveling devices connected to the front end of the axle or the extended beam front end in the extended position, having a side frame, a crawler belt, and a traveling drive device;
A telescopic device for moving the traveling device along the extending direction of the axle;
An extension beam fixing member for fixing the extension beam at the extended position between the extension beam and the axle;
A fixing member holding portion that is provided on a side surface of the side frame, and is engaged with and held by the extension beam fixing member removed from between the extension beam and the axle from above;
The fixing member holding portion is positioned below the extension beam at the folding position, and includes an upper surface of the extension beam fixing member held by the fixing member holding portion and a lower surface of the extension beam at the folding position. A working machine with a crawler, characterized in that a distance is shorter than an upward movement distance of the extension beam fixing member necessary for releasing the engagement between the extension beam fixing member and the fixing member holding portion. Car body,
An axle extending in the width direction from the car body;
An upper swing body mounted on the car body so as to be pivotable;
An extension beam pivotally supported at the tip of the axle and rotatable between two positions, an extended position and a folded position with respect to the axle;
A pair of crawler-type left and right traveling devices connected to the front end of the axle or the extended beam front end in the extended position, having a side frame, a crawler belt, and a traveling drive device;
A telescopic device for moving the traveling device along the extending direction of the axle;
An extension beam fixing member for fixing the extension beam at the extended position between the extension beam and the axle;
A fixing member holding portion that is provided on a side surface of the extension beam and is engaged and held when the extension beam fixing member removed from between the extension beam and the axle is inserted from above;
A fixing member pop-out preventing portion provided above the fixing member holding portion in a state where the extension beam is in a folded position on a side surface of the side frame,
The extension beam fixing member is fixed by causing the lower surface of the fixing member pop-out preventing portion to face the upper surface of the extension beam fixing member held by the fixing member holding portion in a state where the extension beam is in the folded position. A work machine with a crawler, which prevents falling off from a member holding part. In the work machine with a crawler according to any one of claims 1 to 3,
A gap is provided between the tip of the axle and the end of the extension beam facing the tip of the axle at the extended position,
The extension beam is fixed at the extended position when the extension beam fixing member is inserted into the gap, and is rotatable toward the folding position when the extension beam fixing member is removed from the gap. Features a crawler work machine. In the work machine with a crawler according to any one of claims 1 to 4,
Two axles are provided on each of the left and right sides in the vehicle width direction,
The extension beam fixing member requires four in total, two for each of the pair of left and right traveling devices,
The fixing member holding portion is provided at one place for each of the pair of left and right traveling devices, and the two extension beam fixing members are held by the one fixing member holding portion. machine.

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