JP2013185351A - Revolving work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove sediment, etc. accumulated in a U-shaped groove beyond an obstacle while moving a revolving work vehicle along the obstacle such as a dike.SOLUTION: A base end portion of an arm-shaped work part is mounted on one of a right and left sides of a revolving superstructure arranged on a carrier part. In the state that the revolving superstructure is oriented in the longitudinal direction of the carrier part, a front end side and a middle portion of the work part can be offset to the outside and the front end side portion of the work part can be offset within a range starting from an outside edge portion of the carrier part on the offset side and having the horizontal width of the carrier part.

Description

  The present invention relates to a turning work vehicle including a working unit that allows a work attachment attached to a tip end part to be largely offset to the outside of a machine body.

  Conventionally, there exists what was described in patent document 1 as one form of a turning work vehicle. In other words, such a turning work vehicle includes an excavating part as a working part at the center of the front end of the turning body disposed on the crawler type traveling part. The excavation part includes a boom whose base end is connected to the swivel body so as to freely rotate up and down, an arm whose base end is connected to the tip of the boom via a cylinder stay, and a tip of the arm. And a bucket having a base portion connected to be freely rotatable up and down. Further, the boom is connected to the distal end portion of the proximal end side half portion so that the proximal end portion of the distal end side half portion is rotatable in the left-right direction. A cylinder stay is pivotally connected to the tip of the boom's tip half, and an offset connecting piece is interposed between the tip of the boom's base half and the cylinder stay. In addition, an offset mechanism is formed by providing an offset cylinder between the distal half and the proximal half of the boom. By configuring the offset cylinder in this way, the offset mechanism, and thus the arm and the bucket can be offset (biased) integrally in the left and right sides by extending and contracting.

  And the offset (bias) width to the left and right sides is a width that is slightly larger than the left and right widths of the traveling portion or the left and right widths, and is substantially equal to the left and right sides.

JP 5-98661

  However, since the excavation part of the turning work vehicle described above has a laterally offset (biased) width that is slightly larger than the lateral width of the traveling part or the lateral width thereof, There was a problem in that it was not possible to remove the earth and sand accumulated in the U-shaped groove over the obstacle while moving the turning work vehicle along the obstacle.

  Therefore, the present invention provides a turning work vehicle that can remove earth and sand accumulated in a U-shaped groove over an obstacle while moving the turning work vehicle along an obstacle such as a fence. Objective.

  The turning work vehicle according to the first aspect of the present invention has a base end portion of an arm-like working portion attached to either one of the left and right sides of the turning body disposed on the traveling portion, and turns in the front-rear direction of the traveling portion. With the body oriented, the tip side can be offset from the middle of the working part to the outside, and the tip side of the working part can be moved from the outer edge of the running part on the offset side to the running part. An offset arrangement is possible within the same width as the left and right widths.

  In such a turning work vehicle, since the front end side portion of the working portion can be offsetly arranged within the same width as the left and right width of the traveling portion from the outer edge of the offset-side traveling portion, it is possible to arrange a hook, a groove, etc. It is possible to remove earth and sand accumulated in the U-shaped groove over the obstacle while moving the turning work vehicle along the obstacle. As a result, the working range of the working unit can be expanded and the working efficiency of the working unit can be improved.

  A turning work vehicle according to a second aspect of the present invention is the turning work vehicle according to the first aspect of the invention, wherein the working unit is configured by connecting the first to third boom forming bodies in series in the extending direction. A boom that is formed, an arm that is connected to the tip of the third boom forming body, a work attachment that is connected to the tip of the arm, and each of the cylinders that pivots each of them, and the tip of the first boom forming body An offset body formed by extending in a rod shape between the first boom forming body and the base end portion of the third boom forming body is provided in parallel with the second boom forming body, with the distal end portion of the first boom forming body as a center. By rotating the second boom forming body outward, the third boom forming body, the arm, and the work attachment can be integrally offset-moved outward, and the second boom forming body has its extended width. Form wider than the left and right width of the running part Characterized in that no rotatable at an angle less than 90 degrees to the outer side from the position obtained by directed in the longitudinal direction around the distal end portion of the first boom former.

  In such a turning work vehicle, the extended width of the second boom forming body is formed wider than the lateral width of the traveling portion, and the tip of the first boom forming body is positioned from the position where the second boom forming body is directed in the front-rear direction. Since it is possible to rotate outward at an angle of less than 90 degrees around the center, it is possible to secure a sufficient offset width to the outside, and to extend and retract the cylinder by which the second boom forming body is offset Can be made as short as possible, and the size of the cylinder can be reduced.

  A turning work vehicle according to a third aspect of the invention is a turning work vehicle according to the second aspect of the invention, wherein the second boom forming body connected to the turning body via the first boom forming body is It is characterized by being formed longer than one boom forming body.

  In such a turning work vehicle, the second boom forming body that determines the offset width is formed longer than the first boom forming body that supports the second boom forming body. The offset width can be kept as long as possible while keeping the overhanging width of the working part attached to the shape as constant (the limit width on strength), and the offset work performance is improved. be able to.

  A turning work vehicle according to a fourth aspect of the present invention is the turning work vehicle according to the second or third aspect of the invention, wherein the tip edge portion of the bucket as the work attachment has a bottom shape on the inner surface of the U-shaped groove. It is characterized by being formed along.

  In such a turning work vehicle, the leading edge of the bucket is formed along the shape of the bottom of the inner surface of the U-shaped groove, so that the earth and sand accumulated in the U-shaped groove can be removed steadily. The residual rate of earth and sand in the groove can be made almost zero. As a result, removal efficiency of earth and sand can be improved, and work efficiency can be improved.

  A turning work vehicle according to a fifth aspect of the present invention is the turning work vehicle according to the second or third aspect of the invention, wherein a front end forming portion made of a synthetic resin is attached to and detached from a front end edge portion of a bucket as a work attachment. While being freely attached, the tip forming portion is formed along the bottom shape of the inner surface of the U-shaped groove.

  In such a turning work vehicle, the tip forming portion made of synthetic resin that is detachably attached to the tip edge portion of the bucket is formed along the bottom shape of the inner surface of the U-shaped groove, so that the bottom portion of the U-shaped groove is damaged. Sediment and the like can be efficiently removed without equalization.

  According to the present invention, the front end side portion of the working portion can be offset from the outer edge of the offset-side traveling portion within the same width as the lateral width of the traveling portion. The working range can be expanded. Therefore, for example, while moving a turning work vehicle along an obstacle such as a fence or a groove, earth and sand accumulated in the U-shaped groove over the obstacle can be removed, and work efficiency is improved. Can do.

Explanatory drawing of the right side of the excavation work vehicle as a turning work vehicle which concerns on this invention. Plane explanatory drawing of the excavation work vehicle as a turning work vehicle which concerns on this invention. Front explanatory drawing of the excavation work vehicle as a turning work vehicle which concerns on this invention. The side view (a) of the bucket as a 1st modification, and the back surface explanatory drawing (b) of a bucket. The side view (a) of the bucket as a 2nd modification, and the back surface explanatory drawing (b) of a bucket. The hydraulic circuit diagram of an offset cylinder.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 is an excavation work vehicle as a turning work vehicle according to the present invention. The excavation work vehicle A is composed of a traveling machine body 1 capable of self-propelling, an excavation part 2 as a working part attached to the traveling machine body 1, and a soil removal part 3. In this embodiment, an excavation bucket 12 is attached as a work attachment to the distal end of the work unit to form the excavation unit 2. G is the working ground, and M is the excavation groove.

  As shown in FIGS. 1 to 3, the traveling machine body 1 has a base 5 interposed between a pair of left and right crawler-type traveling parts 4, 4, and a revolving body 6 is mounted on the base 5 in a freely swingable manner. doing. The swivel body 6 has a substantially disc shape that can swivel within the left and right widths of the travel parts 4 and 4 (interval between the outer edge 4a of the left travel part 4 and the outer edge 4a of the right travel part 4) W1. Forming. On the swivel body 6, the operating unit 7 surrounded by the cabin is disposed on either one of the left and right sides (left side in the present embodiment), while on the left or right other side (right side in the present embodiment). A base end portion of the arm-shaped excavation portion 2 is supported, and a prime mover portion 8 is disposed at a lower rear portion of the operation portion 7. The prime mover unit 8 is covered with a bonnet 9 so as to be freely openable and closable. In the bonnet 9, an engine as the prime mover unit 8, a hydraulic pump for pumping hydraulic oil for operating the excavation unit 2 and the soil removal unit 3, A fuel tank that stores fuel for driving the engine, a hydraulic oil tank that stores hydraulic oil, a radiator that cools the engine, and the like are stored.

  By configuring in this way, the traveling machine body 1 is configured so that the traveling unit 4 is operated by the driving unit 7 so that it can appropriately perform straight forward and backward traveling and left and right turning traveling. And the excavation operation | work can be performed by operating the excavation part 2 with the operation part 7. FIG.

  The excavation part 2 is provided with the boom 10, the arm 11, the bucket 12, and the boom cylinder 13, the offset cylinder 43, the arm cylinder 14, and the bucket cylinder 15 which rotate these, as shown in FIGS. The boom 10 connects the first to third boom forming bodies 20, 21, and 22 in series in the longitudinal direction (extension direction). Between the distal end portion of the first boom forming body 20 and the base end portion of the third boom forming body 22, an offset body 23 formed by extending in a rod shape is provided in parallel with the second boom forming body 21. ing. And the 3rd boom formation body 22, the arm 11, and the bucket 12 which are the front end side parts 2a of the excavation part 2 are more constant than the right traveling part 4 in the plan view shown in FIG. 2 and the front view shown in FIG. It is possible to move (offset movement) in parallel to the outer side (right side in this embodiment) by the width (offset width W2). Here, the offset width W <b> 2 is the distance between the outer edge 4 a of the right traveling unit 4, the third boom forming body 22, which is the tip side of the working unit, the arm 11, and the center line C of the bucket 12. .

  More specifically, a boom pivot body 30 formed in a bifurcated left and right shape is provided at the right front portion of the swing body 6, and the base end of the first boom formation body 20 extending in the front-rear direction on the boom pivot body 30. The first boom forming body 20 is pivotable up and down around the first pivot 31 by pivotally supporting the portion by a first pivot 31 having an axial center line in the left-right direction. A first attachment piece 32 is provided on the right rear portion on the revolving structure 6. Further, a second mounting piece 33 is projected from the base end portion of the first boom forming body 20 located in front of the first pivot 31 toward the lower side. The base end portion of the boom cylinder 13 that expands and contracts in the front-rear direction is connected to the first mounting piece 32 via the first pivot pin 34, and the tip end portion of the boom cylinder 13 is connected to the second mounting piece 33. Directly below the pivot 31 is passed between the bifurcated boom pivots 30 and connected via a second pivot pin 35.

  With this configuration, the first boom forming body 20 rotates upward in conjunction with the extension operation of the boom cylinder 13 and operates upright, while the first boom forming body operates in conjunction with the shortening operation of the boom cylinder 13. 20 is rotated downward so as to perform the overturning operation.

  A proximal end portion of a second boom forming body 21 extending in the front-rear direction is pivotally supported at a distal end portion of the first boom forming body 20 by a second pivot 40 having an axial center line directed in the vertical direction. The second boom forming body 21 is rotatable left and right around 40. A third attachment piece 41 is provided so as to project sideways in the middle portion of the right side surface of the first boom forming body 20. In addition, a fourth attachment piece 42 projects outward from the right side base end of the second boom forming body 21. Then, the third mounting piece 41 is connected to the base end portion of the offset cylinder 43 extending and contracting in the front-rear direction, which is the extending direction of the first boom forming body 20, via the third pivot pin 44 and the fourth mounting piece 42. Further, the tip of the offset cylinder 43 is connected via a fourth pivot pin 45.

  With this configuration, the second boom forming body 21 is rotatable in the left-right direction within a range of a constant angle θ about the second pivot 40. That is, the second boom forming body 21 rotates to the left about the second pivot 40 in conjunction with the extension operation of the offset cylinder 43, while the second boom forming body is interlocked with the shortening operation of the offset cylinder 43. 21 is rotated to the right. Here, as shown in FIG. 2, the constant angle θ is a rotation angle between a position P1 arranged in the front-rear direction parallel to the traveling unit 4 and a position P2 rotated about 90 degrees rightward outward. It is.

  A base end portion of a third boom forming body 22 extending in the up-down direction is pivotally supported at a distal end portion of the second boom forming body 21 by a third pivot 50 having an axial center line directed in the up-down direction. The third boom forming body 22 is rotatable left and right around 50. Here, the axis lines of the second pivot 40 and the third pivot 50 are arranged in a substantially parallel state. A fifth attachment piece 51 projects from the right side front portion of the tip of the first boom forming body 20 toward the right side. Further, a sixth attachment piece 52 protrudes rearward from the right side base end portion of the third boom forming body 22. And while connecting the base end part of the offset body 23 to the 5th attachment piece 51 via the 5th pivot pin 53, the front-end | tip part of the offset body 23 to the 6th attachment piece 52 via the 6th pivot pin 54 Are connected. Here, the extending direction of the offset body 23 and the extending direction of the second boom forming body 21 are set to be in a parallel state.

  With this configuration, the tip side portion of the excavation unit 2 can be translated in the left-right direction within the above-described offset width W2 (constant angle θ). That is, when the offset cylinder 43 is expanded and contracted, the second boom forming body 21 is rotated in the left-right direction within a certain angle θ in conjunction with the offset cylinder 43. Then, in conjunction with the rotation of the second boom forming body 21, the offset body 23 also rotates in the left-right direction. As a result, the relative distance between the distal end portion of the first boom forming body 20 and the proximal end portion of the third boom forming body 22 (the pointing direction which is the front-rear direction in the present embodiment) is kept constant, and the third boom formation is performed. The body 22 can be translated (offset) in the left-right direction. Under the present circumstances, the front end side part arrange | positioned at the front end side from the 3rd boom formation body 22, ie, the 3rd boom formation body 22, the arm 11, and the bucket 12 is not inclined right and left in front view. Here, the second boom forming body 21 is allowed to rotate only within a certain angle θ outward from the right side from the position P1 arranged in the front-rear direction parallel to the traveling unit 4, but the second boom forming body 21 is located on the left side from the position P1. In this way, it is prevented from rotating.

  At the distal end of the third boom forming body 22, the base end of the arm 11 extending in the vertical direction is pivotally supported by the fourth pivot 60 with the axial center line directed in the left-right direction, and the fourth pivot 60 is the center. Thus, the arm 11 can be pivoted back and forth (up and down pivotable). A seventh attachment piece 61 is formed on the upper surface of the base end portion of the third boom forming body 22 so as to bulge forward. In addition, an eighth attachment piece 62 projects forward from the front side base end of the arm 11. The base end portion of the arm cylinder 14 that expands and contracts in the front-rear direction is connected to the seventh mounting piece 61 via the seventh pivot pin 64, and the distal end portion of the arm cylinder 14 is connected to the eighth mounting piece 62 at the eighth pivot. It is connected via a support pin 65.

  With this configuration, the arm 11 is rotated in the front-rear direction (vertical direction) about the fourth pivot 60 in conjunction with the expansion and contraction operation of the arm cylinder 14.

  At the tip of the arm 11, the base of the bucket 12 is pivotally supported by a fifth pivot 70 whose axis is directed in the left-right direction, and the bucket 12 can be pivoted back and forth around the fifth pivot 70 (up and down pivoting). (Free). Further, a bucket link 71 is interposed between the distal end portion of the arm 11 and the base portion of the bucket 12, and between the bucket link 71 and the eighth mounting piece 62 protruding from the front side base end portion of the arm 11. A bucket cylinder 15 that extends and contracts in the vertical direction is interposed. 73 is a ninth pivot pin, and 74 is a tenth pivot pin.

  In this manner, the bucket 12 is rotated in the front-rear direction (vertical direction) about the fifth pivot 70 in conjunction with the expansion and contraction operation of the bucket cylinder 15. And the removal work or excavation work of earth and sand etc. is performed with the bucket 12.

  The excavation part 2 configured as described above can be arranged in a compactly housed state on the revolving structure 6. That is, the first boom forming body 20, the second boom forming body 21, and the third boom forming are first performed by restoring the second boom forming body 21 that has been offset moved in the same direction as the first boom forming body 20. The body 22, that is, the boom 10 is arranged on the same axis in plan view. Subsequently, the first boom forming body 20 is raised and rotated to bring the boom 10 into an upright state on the revolving body 6. At this time, the first boom forming body 20 and the second boom forming body 21 forming the boom 10 are in an upright posture extending in the vertical direction, and the third boom forming body 22 is in a recumbent posture extending in a protruding manner forward. Become. Thereafter, the arm 11 and the bucket 12 are suspended downward from the tip of the third boom forming body 22 and are disposed close to the first and second boom forming bodies 20 and 21. In this way, the excavation part 2 can be accommodated and arranged in a compact manner in a folded manner on the revolving structure 6, and the excavation work vehicle A can be moved and moved in this state.

  As shown in FIGS. 1 to 3, the earth removal portion 3 can move up and down the base end portions of the pair of left and right earth removal arms 78 and 78 extending in the front-rear direction to the base 5 between the pair of left and right traveling portions 4. And a soil removal plate 79 extending in the left-right direction is constructed between the distal ends of the soil discharge arms 78 and 78. Reference numeral 80 denotes a discharge plate lifting cylinder. The earth removing plate 79 is formed to have substantially the same width as the left and right side width W1 of the traveling portions 4 and 4.

  In the configuration as described above, the gist of the present invention is that the tip side portion 2a is moved outward from the midway portion of the excavating portion 2 as the working portion in a state where the revolving body 6 is oriented in the front-rear direction of the traveling portions 4 and 4. The tip side 2a of the excavation part 2 has the same width as the lateral width W1 of the running parts 4 and 4 from the outer edge 4a of the running part 4 on the offset side (right side in this embodiment). This is because the offset can be arranged in an overhang shape within the range of the offset limit width W3. Here, it is possible to place the offset within the range of the lateral width W1 and the offset limit width W3 of the traveling units 4 and 4 (the offset width W2 is set). This is because a sufficient offset width W2 can be ensured and the tip side 2a of the excavation part 2 can be stably supported by the traveling machine body 1 that is made as small as possible.

  That is, the excavation part 2 rotates the second boom formation body 21 around the front end portion of the first boom formation body 20 to the right outer side which is the outer side, so that the third boom formation body 22 and the arm 11 The bucket 12 as a work attachment can be integrally offset and moved outwardly to the right side, and the second boom forming body 21 has an extended width wider than the left and right width W1 of the running parts 4 and 4. And a position oriented in the front-rear direction, that is, a position P1 disposed in the front-rear direction parallel to the traveling unit 4, and a right outer side centering on the second pivot 40 provided at the tip of the first boom forming body. It is possible to rotate within a certain angle θ (an angle of less than 90 degrees).

  And the extension width of the 2nd boom formation body 21 connected with the turning body 6 via the 1st boom formation body 20 is formed longer than the extension width of the 1st boom formation body 20. FIG. That is, the second boom forming body 21 that determines the offset width W2 is formed to be longer than the first boom forming body 20 that supports the second boom forming body 21 so as to project from the revolving body 6 (overhang shape). The offset width W2 is as long as possible while keeping the overhanging width of the excavating part 2 attached to () constant (limit width on strength).

  The boom pivot body 30 is arranged so as to be biased to the left and right side portions (right front portion in the present embodiment) of the revolving body 6, and the base end portion of the boom 10 is attached to the boom pivot body 30. Therefore, the living space of the operating unit 7 disposed adjacent to the side of the boom pivot 30 on the swivel body 6 can be secured as wide as possible, and the second boom forming body 21 is disposed outward. It is possible to make an offset arrangement by overhanging.

  By configuring in this way, the tip side 2a of the excavating part 2 is within the offset width W2, that is, the lateral width W1 of the traveling part 4 and the offset limit width W3 from the outer edge 4a of the traveling part 4 on the offset side. For example, earth and sand accumulated in the U-shaped groove over obstacles while moving the excavation work vehicle A along obstacles such as dredging and grooves. Can be removed easily and steadily. That is, even if the work place is a place away from the moving direction of the traveling machine body 1, if the traveling machine body 1 can be disposed within the offset width W2, the work can be performed by moving the traveling machine body 1 while maintaining the offset width W2. It can be done smoothly and consistently. As a result, the work range of the excavation unit 2 can be expanded and the work efficiency of the excavation unit 2 can be improved.

  And the extension width of the 2nd boom formation body 21 is formed wider than the left-right width W1 of the traveling parts 4 and 4, and the 1st boom formation body from the position P1 which orient | assigned the 2nd boom formation body 21 to the front-back direction. Since the second pivot 40 provided at the front end portion of the center 20 is pivotable rightward outward at a constant angle θ, a sufficient offset width W2 outwardly to the right can be secured, and 2 The extension / contraction operation width of the offset cylinder 43 for offsetting the boom forming body 21 can be shortened as much as possible, and the offset cylinder 43 can be downsized.

  Here, since the 2nd boom formation body 21 which determines offset width W2 is formed longer than the 1st boom formation body 20 which supports the 2nd boom formation body 21, it protrudes from the turning body 6 ( The offset width W2 can be kept as long as possible while keeping the overhanging width of the excavating part 2 attached to the overhang shape constant (the limit width in terms of strength). Performance can be improved.

  Further, the swivel body 6 is disposed so as to be turnable within the left-right width W1 of the left and right traveling portions 4,4. Therefore, if the swivel body 6 can be arranged in a narrow area where the left and right traveling parts 4 and 4 can enter, the tip side part 2a is offset from the offset limit width W3 to remove earth and sand. It can be performed.

  FIG. 4 shows a bucket 12 as a first modified example. The bucket 12 has a flat bottom plate portion 85, left and right side wall portions 86, 86 erected on the left and right side portions of the bottom plate portion 85, and FIG. A so-called flat bucket is formed from a base end wall portion 87 interposed between the base end edge portions of the left and right side wall portions 86, 86 and a mounting portion 88 attached to the outer surface of the base end wall portion 87. The bottom plate portion 85 is formed along the inner shape of the U-shaped groove U. In particular, the tip 85a of the bottom plate 85 is formed so as to protrude from the tips of the left and right side walls 86, 86, and the tip edge 85b of the tip 85a is the bottom of the inner surface of the U-shaped groove U. It is formed along the shape. That is, the front end edge portion 85b of the front end portion 85a is formed in an arc shape with the left and right side portions along the bottom shape of the inner surface of the U-shaped groove U.

  Since the tip edge portion 85b of the bucket 12 is formed along the bottom shape of the inner surface of the U-shaped groove U, the earth and sand accumulated in the U-shaped groove U can be removed firmly. Thus, the residual rate of earth and sand in the U-shaped groove U can be made substantially zero. As a result, removal efficiency of earth and sand can be improved, and work efficiency can be improved.

  FIG. 5 shows a bucket 12 as a second modified example, and the bucket 12 as the second modified example has the same basic structure as the bucket 12 as the first modified example. A tip forming portion 89 made of synthetic resin is detachably attached to the tip end portion 85a of the tip end portion 85a with a mounting bolt 90, and a tip edge portion 89b of the tip forming portion 89 is formed along the bottom shape of the inner surface of the U-shaped groove U. Is different. As the synthetic resin, a hard synthetic resin such as urethane or nylon 66 can be used.

  In this way, the leading edge portion 89b of the synthetic resin tip forming portion 89 detachably attached to the tip portion 85a of the bucket 12 is formed along the bottom shape of the inner surface of the U-shaped groove U. Therefore, earth and sand can be efficiently removed without damaging the bottom of the U-shaped groove U.

  FIG. 6 is a hydraulic circuit diagram of the offset cylinder 43. A hydraulic circuit 91 is connected to the offset cylinder 43, and the hydraulic circuit 91 has a first relief valve 93 attached to a middle portion of the base end side oil passage 92 connected to the base end side portion of the offset cylinder 43, and an offset A second relief valve 95 is attached to a midway portion of the distal end side oil passage 94 connected to the distal end side portion of the cylinder 43. 96 is a main relief valve, 97 is a first switching valve, 98 is a second switching valve, P is a hydraulic pump, and T is a hydraulic oil tank. The relief pressures of the first and second relief valves 93 and 95 are set to be lower than the relief pressure of the main relief valve 96.

  With this configuration, when an overload is generated in the offset cylinder 43 that performs the offset operation of the second boom forming body 21, the hydraulic pressure is relieved from the first relief valve 93 and / or the second relief valve 95. The offset cylinder 43 can be prevented from being damaged. As a result, the offset function of the excavation part 2 can be ensured satisfactorily. Further, the hydraulic circuit of the boom cylinder 13, the arm cylinder 14 and the bucket cylinder 15 is configured in the same manner as the hydraulic circuit 91 of the offset cylinder 43, so that the cylinders 13, 14 and 15 are prevented from being damaged. Thus, the excavation function of the excavation part 2 can be ensured satisfactorily.

A excavation work vehicle W1 left and right width W2 offset width θ constant angle 1 traveling machine body 2 excavating part 3 earthing part 4 traveling part 5 base 6 revolving body 7 operating part 10 boom 11 arm 12 bucket 13 boom cylinder 14 arm cylinder 15 bucket cylinder 43 Offset cylinder

Claims (5)

With the base end of the arm-shaped working part attached to either the left or right side of the swivel body arranged on the traveling part, the middle part of the working part with the swivel body oriented in the front-rear direction of the traveling part The tip side can be offset from the outside to the outside,
A turning work vehicle characterized in that the front end side portion of the working portion can be offsetly arranged within the range of the same width as the lateral width of the traveling portion from the outer edge of the traveling portion on the offset side. The working section includes a boom formed by connecting the first to third boom forming bodies in series in the extending direction, an arm connected to the tip of the third boom forming body, and a work connected to the tip of the arm. The second boom is provided with an attachment and each cylinder for rotating them, and an offset body formed by extending in a rod shape between the distal end portion of the first boom forming body and the proximal end portion of the third boom forming body. The third boom forming body, the arm, and the work attachment are integrated by rotating the second boom forming body outwardly around the tip of the first boom forming body. Can be moved outwardly offset,
The second boom forming body is formed to have an extension width wider than the left and right width of the traveling portion, and is less than 90 degrees outward from the position oriented in the front-rear direction centering on the front end portion of the first boom forming body. The turning work vehicle according to claim 1, wherein the turning work vehicle can be rotated at an angle.   The turning work vehicle according to claim 2, wherein the second boom forming body connected to the turning body via the first boom forming body is formed to be longer than the first boom forming body.   The turning work vehicle according to claim 2 or 3, wherein the tip edge portion of the bucket as the work attachment is formed along the bottom shape of the inner surface of the U-shaped groove.   A synthetic resin tip forming portion is detachably attached to a tip edge portion of a bucket as a working attachment, and the tip forming portion is formed along the bottom shape of the inner surface of the U-shaped groove. The turning work vehicle according to 2 or 3.

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