WO2021192625A1 - Construction machine - Google Patents

Abstract

The present invention reduces the risk of damaging hydraulic hoses connected to angle cylinders, in an oil-passage configuration for the angle cylinders, the angle cylinders being used to pivot a soil removal plate of a soil removal device.　Provided is a construction machine having a soil removal device 4, the construction machine including: a support frame 30 that includes a pair of left and right arms 33 supported at a machine side so as to be able to pivot upward and downward; a blade 31 that is supported in front of the support frame 30 so as to be able to pivot in the front-back direction; angle cylinders 32 that are respectively mounted on the pair of left and right arms 33, that couple the arms 33 with the blade 31, and that make the blade 31 pivot in the front-back direction; and a branching-and-merging block 80 that branches hydraulic oil pumped from the machine side into the pair of angle cylinders 32 and that merges the hydraulic oil discharged from the pair of angle cylinders 32. The branching-and-merging block 80 is disposed between the pair of left and right arms in the left-right direction.

Description

Construction machinery

The present invention relates to a construction machine having an earth removal device.

Conventionally, as an earth removal device provided in a construction machine such as an excavation work vehicle, a support frame rotatably supported by a traveling device forming the machine and a rotation axis in the vertical direction with respect to the support frame. A configuration including a blade for soil removal (earth removal plate) supported so as to be rotatable in the front-rear direction (swingable) and an angle cylinder for rotating the blade in the front-rear direction (angle rotation). There are some (see, for example, Patent Document 1). In Patent Document 1, the bottom side (cylinder tube side) of the angle cylinder is supported by the blade in order to prevent the earth and sand overflowing from the blade toward the rear from entering the cylinder tube of the angle cylinder during the earth removal work or the like. At the same time, a configuration in which the rod side of the angle cylinder is supported by the support frame is disclosed.

In Patent Document 1, as a configuration for supplying pressure oil as hydraulic oil to an angle cylinder, a cylinder rod slidably provided in a cylinder tube via a piston is provided on both sides of the piston in the cylinder tube. A configuration is disclosed in which two oil passages communicating with each space are formed. In such a configuration, the angle cylinder expands and contracts by supplying and discharging pressure oil through two oil passages formed in the cylinder rod.

In addition, as a configuration of the soil removal device, there is a configuration in which two angle cylinders are provided by arranging angle cylinders on both left and right sides of a support frame that supports the blade. (See, for example, Patent Document 2.). Patent Document 2 discloses the following configuration as a configuration for supplying pressure oil to two angle cylinders.

In the earth removal device disclosed in Patent Document 2, a connection valve is provided as an intermediate port connected by piping to the center port provided on the base of the traveling device. Then, a hydraulic hose (oil pipe) for supplying and discharging pressure oil to each of the left and right angle cylinders extends from the connection valve, and each hydraulic hose is bypassed and connected to each angle cylinder.

Japanese Unexamined Patent Publication No. 2009-21566898 Japanese Unexamined Patent Publication No. 2000-8409

Regarding the oil passage configuration for pressure oil for the left and right angle cylinders, according to the configuration in which the hydraulic hose is bypassed and piped as disclosed in Patent Document 2, the arrangement range of the hydraulic hose is likely to be expanded. If the arrangement range of the hydraulic hose is widened, there is a problem that the risk of damage to the hydraulic hose due to the earth and sand overflowing from the blade toward the rear and foreign matter contained in the earth and sand increases during the earth removal work and the like.

In particular, when a support configuration in which the bottom side is the front side and the rod side is the rear side is adopted as the support configuration of the left and right angle cylinders as disclosed in Patent Document 1, the hydraulic hose is attached to the cylinder tube portion of the angle cylinder. Since it is connected, it becomes necessary to extend the hydraulic hose forward. Therefore, the arrangement range of the hydraulic hose becomes wide.

The present invention has been made in view of the above problems, and the hydraulic hose connected to the angle cylinder is damaged in the oil passage configuration for the angle cylinder for rotating the soil removal plate of the soil removal device. The purpose is to provide construction machinery that can reduce the risk of flood control.

The construction machine according to the present invention is a construction machine having a soil removal device, and the soil removal device includes a support frame including a pair of left and right arms rotatably supported on the machine side, and the support frame. The soil removal plate is rotatably supported in the front-rear direction and is attached to each of the pair of left and right arms. It is provided with an angle cylinder that rotates to and an oil passage branching / merging portion that branches the pressure oil pumped from the machine side into the pair of angle cylinders and merges the pressure oil discharged from the pair of angle cylinders. The oil passage branch merging portion is arranged between the pair of left and right arms in the left-right direction.

Further, in the construction machine according to another aspect of the present invention, in the construction machine, the oil passage branching / merging portion is attached to a beam member provided between the pair of left and right arms.

Further, in the construction machine according to another aspect of the present invention, in the construction machine, the oil channel branching / merging portion is arranged at the left and right central portions of the support frame.

Further, in the construction machine according to another aspect of the present invention, in the construction machine, the oil channel branching / merging portion is arranged at the front portion of the support frame.

Further, in the construction machine according to another aspect of the present invention, in the construction machine, the oil channel branching / merging portion is arranged at the rear portion of the support frame.

Further, in the construction machine according to another aspect of the present invention, in the construction machine, the angle cylinder has the cylinder tube side supported by the back side of the soil removal plate and the cylinder rod side supported by the support frame. It is provided in a state.

According to the present invention, it is possible to reduce the risk of damage to the hydraulic hose connected to the angle cylinder in the oil passage configuration for the angle cylinder for rotating the soil removal plate of the soil removal device.

It is a left side view of the construction machine which concerns on one Embodiment of this invention. It is a perspective view from the left front side of the construction machine which concerns on one Embodiment of this invention. It is a left side view of the earth removal device which concerns on one Embodiment of this invention. It is a rear perspective view of the earth removal device which concerns on one Embodiment of this invention. It is a top view of the earth removal apparatus which concerns on one Embodiment of this invention. It is a bottom view of the earth removal device which concerns on one Embodiment of this invention. It is an enlarged perspective view of the earth removal apparatus which concerns on one Embodiment of this invention. It is an enlarged plan view of the earth removal apparatus which concerns on one Embodiment of this invention. It is a figure which showed typically the oil passage structure with respect to the angle cylinder which concerns on one Embodiment of this invention.

The present invention is a hydraulic hose (oil pipe) connected to an angle cylinder by devising an oil passage configuration for an angle cylinder that rotates a blade (earth removal plate) for earth removal in a construction machine having an earth removal device. It seeks to reduce the risk of damage to the cylinder. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the present embodiment, as the construction machine according to the present invention, an excavation work machine which is a turning work vehicle will be described as an example. However, the construction machine according to the present invention is not limited to the excavation work machine, and can be widely applied to other construction machines such as a crane work machine and a wheel loader, for example.

First, the overall configuration of the excavation work machine 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the excavation work machine 1 includes a traveling device 2 as a self-propellable traveling vehicle body, an excavating device 3 as a working unit attached to the traveling device 2, and an earth removal device 4. Have.

The traveling device 2 is a part forming the machine of the excavation work machine 1, and is an airframe frame as a base interposed between a pair of left and right crawler type traveling portions 5 and 5 and the left and right traveling portions 5 and 5. It has 6 and a swivel base 7 provided on the body frame 6. The swivel base 7 is formed in a substantially circular shape in a plan view, and is provided so as to be swivelable in either the left or right direction around the axis in the vertical direction. Further, the swivel base 7 can be swiveled within the left-right width of the left and right traveling portions 5, 5, that is, within the width between the left outer edge of the left traveling portion 5 and the right edge of the right traveling portion 5. It is configured. As a result, the excavation work machine 1 can perform a small turning work.

A driving unit 10 having a flat floor portion 8 is provided on the swivel table 7. The floor portion 8 is provided on the swivel table 7 on the left side portion of the front half portion. A tank portion 9 is provided on the right side of the driving portion 10. Further, a prime mover portion 11 including an engine and the like is provided in the latter half portion on the swivel base 7.

The base end of the excavator 3 is attached to the left and right center of the front end of the swivel 7. The excavating device 3 has a boom 12 forming a portion on the base side thereof, an arm 13 connected to the tip end side of the boom 12, and a bucket 14 attached to the tip end portion of the arm 13. The excavating device 3 is provided so as to swing left and right with respect to the swivel table 7 by a swing cylinder (not shown) arranged on the right side of the base end portion thereof.

The excavating device 3 has a boom cylinder 15 that rotates the boom 12, an arm cylinder 16 that rotates the arm 13, and a bucket cylinder 17 that rotates the bucket 14. In the excavation device 3, the bucket 14 is detachably attached as a work attachment, and another device such as a rock drilling device or a crushing device is attached instead of the bucket 14 according to the work content.

A soil removal device 4 is attached to the front side of the machine frame 6 via between the left and right traveling portions 5 and 5.

A canopy 21 that covers the upper part of the driving unit 10 is provided on the swivel table 7. The canopy 21 has a pair of left and right columns 22 and 22 erected above the prime mover portion 11 which is a rear end portion on the swivel base 7, and a roof portion 23 supported by the left and right columns 22 and 22. The roof portion 23 has a substantially rectangular plate-like outer shape when viewed from above, and is provided substantially horizontally so as to cover directly above the operating portion 10.

In the driver unit 10, a driver's seat support pedestal 25 is provided on the rear side of the floor portion 8, and a driver's seat 26 is provided on the driver's seat support pedestal 25. A pair of left and right traveling levers 27, 27 are provided in front of the driver's seat 26 in a state of extending upward from the floor portion 8. The traveling operation of the traveling device 2 is performed by tilting the traveling levers 27 and 27 in the front-rear direction. A plurality of operation pedals for work are arranged on the left and right sides of the traveling levers 27 and 27 on the floor portion 8.

In the driver unit 10, around the driver's seat 26, a work operation lever for operating the work unit (excavation device 3 or earth removal device 4), an operation panel unit having various operation units such as switches, and the like are provided. ing. In the swivel table 7, the left front side of the driver's seat 26, that is, the left side of the floor portion 8, is the entrance / exit for the operator with respect to the driver's seat 10.

In the excavation work machine 1 having the above configuration, the operator seated in the driver's seat 26 appropriately operates the traveling levers 27, 27, the work operation lever, and the like to perform desired operations and work. Specifically, for example, by operating the traveling levers 27 and 27, the traveling device 2 travels straight forward and backward and turns left and right. Further, by operating the work operation lever, excavation work by the excavation device 3 or soil removal work or ground leveling work by the soil removal device 4 is performed.

The earth removal device 4 according to the present embodiment will be described with reference to FIGS. 1 to 9. The soil removal device 4 is a device provided for the traveling device 2 in the excavation work machine 1, and includes a support frame 30, a blade 31 which is a soil removal plate supported by the support frame 30, and a pair of left and right angle cylinders. It includes 32 (32L, 32R). The earth removal device 4 including these configurations is configured substantially symmetrically as a whole.

The support frame 30 includes a pair of left and right arms 33 (33L, 33R) that are vertically rotatable with respect to the traveling device 2 of the present machine and are extended in the front-rear direction between the left and right traveling portions 5 and 5. The left and right arms 33 rotatably support the base end portions of the support brackets 6a provided on the front portion of the airframe frame 6 with the left-right direction as the rotation axis direction, and move up and down with respect to the airframe frame 6. It is mounted so that it can be moved. That is, the support frame 30 constitutes an integrated elevating and rotating body including the left and right arms 33, and the base end portions of the left and right arms 33 are rotating support portions for the machine frame 6 constituting the traveling device 2. It is supposed to be.

The left and right arms 33 rotate up and down between the machine frame 6 and the support frame 30 due to the expansion and contraction operation of the blade cylinders 34 provided at the center of the left and right. That is, the blade cylinder 34 expands and contracts to raise and lower the blade 31 via the support frame 30.

The blade cylinder 34 is provided in a state of being erected between the machine frame 6 and the support frame 30 with the expansion / contraction direction (longitudinal direction) along the front-rear direction in a plan view. The rear end portion of the blade cylinder 34 is rotatably supported with respect to the support bracket 6b provided on the front portion of the airframe frame 6 with the left-right direction as the rotation axis direction. The front end portion of the blade cylinder 34 is rotatably supported with respect to the support portion (support plate portion 38) provided at the front portion of the support frame 30 with the left-right direction as the rotation axis direction.

The arm 33 is a vertical plate-shaped portion having a plate thickness direction in the left-right direction, and has an inner surface 33a which is an inner plate surface and an outer surface 33b which is an outer plate surface. The arm 33 has a boomerang-like bent shape that is gentle in the extending direction so that the lower side is the protruding side in the side view, and the portion closer to the rear side in the front-rear direction is the bent portion 33c.

The arm 33 has a shape in which the width is gradually narrowed from the front side to the rear side in the rear portion 33d, which is a portion on the rear side of the bent portion 33c, as a side view shape. A substantially cylindrical boss portion 33e having a left-right direction as a cylindrical axis direction is provided at the rear end portion of the arm 33. The arm 33 is rotatably supported with respect to the support bracket 6a with the left-right direction as the rotation axis direction by a support shaft member penetrating the boss portion 33e.

The arm 33 has a shape in which the width is gradually widened from the rear side to the front side in the front half portion of the front portion 33f, which is a portion on the front side of the bent portion 33c, as a side view shape. The extension direction (horizontal direction in FIG. 3) of the front portion 33f of the arm 33 in a side view is defined as the horizontal direction in the earth removal device 4.

Between the front ends of the left and right arms 33, a substantially rectangular plate-shaped front erection plate portion 36 having a plate thickness direction in the front-rear direction is erected. A front erection portion 37 is provided on the rear surface side of the front erection plate portion 36. The front side erection portion 37 is a substantially semi-cylindrical portion having a substantially triangular shape with the rear side as the curved top side in the cross-sectional view of the side view, and is provided in a manner erected between the left and right arms 33. There is. A pair of left and right support plate portions 38 that rotatably support the front end portion of the blade cylinder 34 are projected rearward from the left and right center portions of the front side erection portion 37.

Further, a cylindrical support cylinder portion 39 is provided between the front and rear intermediate portions of the left and right arms 33. The support cylinder portion 39 is erected between the bent portions 33c of the left and right arms 33. The left and right arms 33 are provided in an inclined shape so that the distance between them is gradually narrowed from the rear side to the front side in a plan view (see FIG. 5). Therefore, the support cylinder portion 39 has a longer dimension than the front side erection portion 37 in the left-right direction.

The blade 31 is supported in front of the support frame 30 so as to be rotatable (swingable) in the front-rear direction with the vertical direction as the rotation axis direction with respect to the support frame 30. The blade 31 has a blade main body 41 having a horizontally long rectangular shape when viewed from the front. The blade main body 41 has substantially the same dimensions as the left and right widths of the left and right traveling portions 5 and 5 in the left-right direction, and projects to the left and right outside with respect to the front erection plate portion 36 of the support frame 30.

The support structure of the blade 31 with respect to the support frame 30 will be described. The blade 31 is an angle rotation (rotation in the front-rear direction) with the vertical direction (vertical direction in FIG. 3) as the rotation axis direction with respect to the support bracket portion 42 provided on the front side of the front erection plate portion 36. (See FIG. 5, arrow A1) is possible, and tilt rotation (see FIG. 4, arrow A2), which is a vertical rotation with the front-back direction (horizontal direction in FIG. 3) as the rotation axis direction, is possible. It is supported.

The support bracket portion 42 has an outer shape that follows a substantially isosceles triangle shape with the front side as the top side in a plan view. The support bracket portion 42 is formed so as to follow the inclined shape of the bracket plate portion 43 in a plan view between the upper and lower bracket plate portions 43 (43H, 43L) provided horizontally in parallel with each other and the upper and lower bracket plate portions 43. It has left and right inclined wall portions 44 provided, and a box-shaped shaft support portion 45 provided on the left and right inclined wall portions 44.

The shaft support portion 45 supports a cylindrical tilt shaft portion 46 whose rotation axis direction is the front-rear direction (see FIG. 6). The tilt shaft portion 46 is rotatably provided with respect to the shaft support portion 45, and projects forward from the shaft support portion 45.

On the other hand, on the back surface 41a, which is the rear surface of the blade main body 41, upper and lower support plate portions 47 (47H, 47L) are provided in the middle portion in the longitudinal direction of the blade main body 41. The support plate portion 47 is a plate-shaped protruding portion along the longitudinal direction of the blade main body portion 41 and having the vertical direction as the plate thickness direction.

The upper and lower support plate portions 47 have substantially the same shape as each other and are provided parallel to each other. The upper and lower support plate portions 47 are erected between the vertical plate-shaped rib plate portions 48, 48 provided on both the left and right sides on the back surface 41a side of the blade main body portion 41, and are installed between the left and right rib plate portions 48. It is formed throughout. The left and right rib plate portions 48, 48 are provided at positions outside the support frame 30 in the left-right direction, respectively.

On the rear side of the blade 31, the tilt shaft portion 46 is located between the central support portions 47a formed in the left and right central portions of the upper and lower support plate portions 47 and forming a semicircular bulging shape portion to the rear. ing. An angle shaft portion 49 (see FIG. 6) that rotatably supports the blade 31 is rotatably supported with respect to the tilt shaft portion 46. The angle shaft portion 49 penetrates the upper and lower central support portions 47a and the tilt shaft portion 46 with the vertical direction as the rotation axis direction, and supports the blade 31 with respect to the tilt shaft portion 46.

As described above, the blade 31 is supported by the support bracket portion 42 constituting the support frame 30 via the tilt shaft portion 46 and the angle shaft portion 49. That is, the blade 31 performs angle rotation with respect to the tilt shaft portion 46 by the angle shaft portion 49, and tilt rotation with respect to the support bracket portion 42 by the tilt shaft portion 46.

The angle cylinder 32 is a hydraulic cylinder, and the blade 31 is rotated in the front-rear direction by expanding and contracting. That is, the blade 31 rotates the angle around the angle shaft portion 49 by the expansion / contraction operation of the pair of left and right angle cylinders 32. Of the pair of left and right angle cylinders 32, the left angle cylinder 32L is arranged on the left side of the support frame 30, and the right angle cylinder 32R is arranged on the right side of the support frame 30. The angle cylinder 32 is horizontally provided at a position overlapping the front portion 33f of the arm 33 in a side view.

The angle cylinder 32 has a cylinder tube 51 and a cylinder rod 52 slidably provided in the cylinder tube 51, and is configured to expand and contract by the sliding operation of the cylinder rod 52 with respect to the cylinder tube 51. .. A piston that slides in the cylinder tube 51 is fixedly provided on one end side of the cylinder rod 52 located in the cylinder tube 51, and the cylinder rod 52 slides with respect to the cylinder tube 51 via the piston. .. A bush is provided on the tip end side of the cylinder tube 51 so as to penetrate the cylinder rod 52 and slide it.

The internal space of the cylinder tube 51 is divided by a piston into a bottom side chamber which is a space on the cylinder tube 51 side (bottom side) and a rod side chamber which is a space on the cylinder rod 52 side (rod side). By supplying and discharging pressure oil, which is hydraulic oil, to each of the bottom side chamber and the rod side chamber, the cylinder rod 52 moves relative to the cylinder tube 51, and the angle cylinder 32 expands and contracts.

The angle cylinder 32 is attached to each of the pair of left and right arms 33, and each arm 33 and the blade 31 are connected to each other. The angle cylinder 32 is provided in a state in which the bottom side is supported by the back side of the blade 31, that is, the back side 41a side of the blade main body 41, and the rod side is supported by the support frame 30 in the expansion / contraction direction. That is, the angle cylinder 32 is erected between the blade 31 and the arm 33 of the support frame 30 with the bottom side facing the front side and the rod side facing the rear side.

At the bottom end of the angle cylinder 32, a mounting boss portion 54 having a hole for penetrating the support shaft is provided as a portion integrated with the cylinder tube 51. The angle cylinder 32 has a mounting boss between the cylinder support portions 47b forming a semicircular bulging shape to the rear, which are formed near the ends on both the left and right sides of the upper and lower support plate portions 47 on the blade 31 side. The portion 54 is positioned and is rotatably supported with respect to the blade 31 by a front support pin 55 as a support shaft penetrating the portions 54. The mounting boss portion 54 is supported by the front support pin 55 via a spherical bush (spherical slide bearing).

At the end of the angle cylinder 32 on the rod side, a mounting boss portion 56 having a hole for penetrating the support shaft is provided as a portion integrated with the cylinder rod 52. On the other hand, on the support frame 30 side, a pair of upper and lower support brackets 57 are projected from the outer surface 33b of the arm 33. The pair of support brackets 57 are provided on the bent portion 33c of the arm 33. The angle cylinder 32 has a mounting boss portion 56 positioned between the upper and lower support brackets 57, and is rotatably supported with respect to the arm 33 of the support frame 30 by a rear support pin 58 as a support shaft penetrating the mounting boss portions 56. There is. The mounting boss portion 56 is supported by the rear support pin 58 via a spherical bush.

As described above, the blade 31 rotates about the angle shaft portion 49 by the expansion and contraction operation of the left and right angle cylinders 32 erected between the blade 31 and the left and right arms 33. The left and right angle cylinders 32 perform left and right reverse expansion and contraction operations with respect to the angle rotation of the cylinder tube 51. That is, when the blade 31 makes an angle rotation to the right, the left angle cylinder 32L expands and the right angle cylinder 32R contracts, and when the blade 31 makes an angle rotation to the left, the right angle cylinder 32R expands. The left angle cylinder 32L contracts.

The soil removal device 4 includes a tilt cylinder 60 for tilting and rotating the blade 31. The tilt cylinder 60 is arranged on the back surface 41a side of the blade main body 41, and is horizontally provided so that the expansion / contraction direction is along the longitudinal direction of the blade main body 41.

The tilt cylinder 60 is a hydraulic cylinder having the same configuration as the angle cylinder 32. That is, the tilt cylinder 60 has a cylinder tube 61 and a cylinder rod 62 slidably provided in the cylinder tube 61 via a piston provided on one end side, and the cylinder rod 62 with respect to the cylinder tube 61. It is configured to expand and contract by sliding motion. The internal space of the cylinder tube 61 is divided into a bottom side chamber and a rod side chamber to which pressure oil is supplied and discharged by a piston.

The tilt cylinder 60 is arranged on the right side from the left and right center portion of the earth removal device 4 with the bottom side on the right side and the rod side on the left side. The tilt cylinder 60 is provided in a state in which the rod side is supported by the support frame 30 and the bottom side is supported by the blade 31 in the expansion / contraction direction.

At the end of the tilt cylinder 60 on the rod side, a mounting boss portion 63 having a hole for penetrating the support shaft is provided as a portion integrated with the cylinder rod 62. On the other hand, on the support frame 30 side, the support plate portion 43a is projected forward from the left and right central portions of the upper bracket plate portion 43H, and is opposed to the support plate portion 43a above the support plate portion 43a. An upper support plate portion 64 is provided. The upper support plate portion 64 is a plate-shaped portion parallel to the upper bracket plate portion 43H, and is a box-shaped support box portion provided in the left and right central portions on the upper bracket plate portion 43H on the front side of the front erection plate portion 36. It is projected forward from 65.

The tilt cylinder 60 has a mounting boss portion 63 located between the support plate portion 43a and the upper support plate portion 64, and is rotatable with respect to the support frame 30 by a left support pin 66 as a support shaft penetrating the support plate portion 43a. Is supported by. The left support pin 66 is provided coaxially with the angle shaft portion 49 above the angle shaft portion 49. The mounting boss portion 63 is supported by the left support pin 66 via a spherical bush.

At the bottom end of the tilt cylinder 60, a mounting boss portion 67 having a hole for penetrating the support shaft is provided as a portion integrated with the cylinder tube 61. On the other hand, on the blade 31 side, a lower support bracket 68a is provided so as to overlap the right end of the upper support plate portion 46H, and a lower support bracket 68a is provided above the lower support bracket 68a. An upper support bracket 68b, which is a plate-shaped portion parallel to the above, is provided.

The tilt cylinder 60 has a mounting boss portion 67 positioned between the lower support bracket 68a and the upper support bracket 68b, and is rotatable with respect to the blade 31 by a right support pin 69 as a support shaft penetrating the mounting boss portion 67. It is supported. The mounting boss portion 67 is supported by the right support pin 69 via a spherical bush.

As described above, the blade 31 tilts and rotates around the tilt shaft portion 46 by the expansion and contraction operation of the tilt cylinder 60 erected between the support frame 30 and the blade 31. The angle rotation and tilt rotation of the blade 31 are selectively performed by switching the flow path by the flow path switching valve 110, which will be described later, by a predetermined operation. For example, it is possible to tilt and rotate the blade 31 in a state of being tilted by angle rotation.

The earth removal device 4 of the present embodiment having the above configuration includes a branch merging block 80 as an oil channel branch merging portion in the oil channel configuration for the left and right angle cylinders 32. The branching / merging block 80 receives the connection of the hydraulic piping extending forward from the traveling device 2 side (machine side), and branches the hydraulic hoses connected to the left and right angle cylinders 32. This is the extended part. The branching / merging block 80 branches the pressure oil pumped from the machine side into a pair of angle cylinders 32, and merges the pressure oil discharged from the pair of angle cylinders 32.

The branch merging block 80 is arranged between the pair of left and right arms 33 in the left-right direction. In the present embodiment, the branch merging block 80 is arranged at the front portion of the support frame 30, and is arranged at the left and right center portions of the support frame 30 in the left-right direction. The configuration and arrangement of the branch merging block 80 according to the present embodiment will be specifically described.

The branch merging block 80 has a rectangular parallelepiped outer shape, and has a block rear surface 81 which is a rear surface and a block front surface 82 which is a front surface. The branch merging block 80 is arranged above the front end portion of the support frame 30. The branching / merging block 80 is provided on the upper surface 65a of the support box portion 65 forming the front end portion of the support frame 30. The branch merging block 80 is attached to the upper surface 65a of the support box portion 65 in a state of being fixed by bolting, welding, or the like.

The upper surface 65a of the support box portion 65 is an inclined surface that rises forward. Therefore, the block rear surface 81 faces the rear diagonally downward side, and the block front surface 82 faces the front diagonally upper side. Most of the block front surface 82 is positioned above the upper edge of the horizontal blade 31 that has not tilted and rotated in the vertical direction (see FIG. 3). The inclination angle of the upper surface 65a with respect to the horizontal direction is, for example, approximately 20 °.

As described above, the branch merging block 80 is attached to the beam member provided between the pair of left and right arms 33. In the present embodiment, the beam member provided between the left and right arms 33 is a portion provided in the front portion of the support frame 30 in a manner erected between the left and right arms 33, and the front erection plate portion 36, It is configured as a portion including a front side erection portion 37, a support bracket portion 42, and a support box portion 65.

The branch merging block 80 is connected to one end side of each of the first machine side hose 83 and the second machine side hose 84 as a hydraulic pipe extending from the traveling device 2 side on the block rear surface 81. The left part of the block rear surface 81 is provided with a left connection port 85 for receiving the connection of the first machine side hose 83, and the right part of the block rear surface 81 is provided with the connection of the second machine side hose 84. A right connection port 86 is provided.

In the branch merging block 80, the first machine body side hose 83 is connected to the left rod side hydraulic hose 87R connected to the rod side of the left angle cylinder 32L and the right bottom side hydraulic hose connected to the bottom side of the right angle cylinder 32R. Branch to 87B. Further, in the branch merging block 80, the second machine side hose 84 is connected to the left bottom side hydraulic hose 88B connected to the bottom side of the left angle cylinder 32L and the right rod side connected to the rod side of the right angle cylinder 32R. Branch to the hydraulic hose 88R.

The front surface 82 of the block is provided with a connection port to which one end of each of the four hydraulic hoses (87R, 87B, 88R, 88B) is connected. In the present embodiment, the following four connection ports are provided in order from the left side to the right side on the front surface 82 of the block. That is, the connection of the first port 90A that receives the connection of one end side of the left rod side hydraulic hose 87R, the second port 90B that receives the connection of one end side of the right bottom side hydraulic hose 87B, and the connection of one end side of the left bottom side hydraulic hose 88B. The receiving third port 90C and the fourth port 90D receiving the connection on one end side of the right rod side hydraulic hose 88R. These four connection ports project diagonally upward and forward along the inclination of the branch merging block 80.

Inside the branch merging block 80, an oil passage communicating with each port of the branch merging block 80 is formed. Specifically, as shown in FIG. 9, a first branch merging flow path 91 is formed in a portion on the left side of the branch merging block 80. The first branch merging flow path 91 includes a merging flow path portion communicating with the left connection port 85 and a branch flow path portion branching from the merging flow path portion and communicating with each of the first port 90A and the second port 90B. including. A second branch merging flow path 92 is formed on the right side of the branch merging block 80. The second branch merging flow path 92 includes a merging flow path portion communicating with the right connection port 86 and a branch flow path portion branching from the merging flow path portion and communicating with each of the third port 90C and the fourth port 90D. including.

The other end of the left rod side hydraulic hose 87R connected to the first port 90A at one end is connected to the rod side port 94 provided at the front of the cylinder tube 51 of the left angle cylinder 32L. Further, the other end side of the right bottom side hydraulic hose 87B whose one end side is connected to the second port 90B is connected to the bottom side port 95 provided at the rear portion of the cylinder tube 51 of the right angle cylinder 32R.

The other end side of the left bottom side hydraulic hose 88B connected to the third port 90C on one end side is connected to the bottom side port 95 of the cylinder tube 51 of the left angle cylinder 32L. Further, the other end side of the right rod side hydraulic hose 88R whose one end side is connected to the fourth port 90D is connected to the rod side port 94 of the right angle cylinder 32R.

The rod side port 94 is a connection port communicating with the rod side chamber in the cylinder tube 51, and is projected upward from the peripheral wall of the cylinder tube 51 at the rear end (rod side) of the cylinder tube 51. The bottom side port 95 is a connection port communicating with the bottom side chamber in the cylinder tube 51, and projects upward from the peripheral wall of the cylinder tube 51 at the front end (bottom side) end of the cylinder tube 51.

As described above, the soil discharge device 4 according to the present embodiment is a hydraulic hose extending from the branching / merging block 80 and connected to each angle cylinder 32, and is located on the bottom side in the expansion / contraction direction with respect to the angle cylinder 32. It has a first hydraulic hose to be connected and a second hydraulic hose connected to the rod side in the expansion / contraction direction with respect to the angle cylinder 32. That is, in the present embodiment, the first hydraulic hose is the right bottom side hydraulic hose 87B and the left bottom side hydraulic hose 88B, and the second hydraulic hose is the left rod side hydraulic hose 87R and the right rod side hydraulic hose 88R. Is.

The four hydraulic hoses (87R, 87B, 88R, 88B) extending from the front side of the branching / merging block 80 are arranged from the front surface 82 of the block toward the front, and 2 with respect to the left and right angle cylinders 32. The pieces are divided into left and right parts and arranged along the back surface of the blade 31, and are connected to the rod side port 94 and the bottom side port 95 of each angle cylinder 32. The arrangement mode of each hydraulic hose will be specifically described.

The left rod side hydraulic hose 87R and the left bottom side hydraulic hose 88B connected to the left angle cylinder 32L extend forward from the first port 90A and the third port 90C, respectively, and are left on the back surface 41a side of the blade main body 41. It is arranged diagonally downward and along the upper surface 47c of the upper support plate portion 47H along the back surface 41a, and is connected to the rod side port 94 and the bottom side port 95, respectively. The left rod-side hydraulic hose 87R connected to the rod-side port 94 extends rearward from the bottom portion of the cylinder tube 51 to the rod-side port 94 along the outer peripheral surface.

The two left hydraulic hoses (87R, 88B) connected to the left angle cylinder 32L are from above with respect to the "L" -shaped hook 96 provided in front of the left side portion of the branching / merging block 80. It is hooked and locked. The hook 96 is provided on the lower side of the front cover 100 that covers the disposed portion of the tilt cylinder 60 from above.

Further, the two left hydraulic hoses (87R, 88B) are attached to the blade 31 by a bent rod-shaped hose guide 97 erected between the back surface 41a of the blade main body 41 and the upper surface 47c of the upper support plate 47H. It is supported against. The hose guide 97, together with the back surface 41a and the upper surface 47c of the upper support plate portion 47H, forms a penetrating portion through which two hydraulic hoses (87R, 88B) are inserted. The two hydraulic hoses (87R, 88B) are arranged so that the intermediate portions located mainly between the hook 96 and the hose guide 97 are adjacent to each other.

The front cover 100 is formed of a plate-shaped member provided in an eaves shape from the upper edge portion of the blade main body 41 toward the rear side in the right portion of the blade main body 41. The front cover 100 is fixed to a support stay provided on the back surface 41a side of the blade main body 41 by a bolt or the like.

The right bottom side hydraulic hose 87B and the right rod side hydraulic hose 88R connected to the right angle cylinder 32R extend forward from the second port 90B and the fourth port 90D, respectively, and the blade is on the back surface 41a side of the blade main body 41. It is arranged substantially horizontally to the right at a height above 31 and is arranged downward on the rear side of the support portion on the right side of the tilt cylinder 60, and the bottom side port 95 and the rod side port, respectively. It is connected to 94. The right rod-side hydraulic hose 88R connected to the rod-side port 94 extends rearward from the bottom portion of the cylinder tube 51 to the rod-side port 94 along the outer peripheral surface.

The two right hydraulic hoses (87B, 88R) connected to the right angle cylinder 32R are above the two "L" -shaped hooks 98 and 99 provided above the tilt cylinder 60. It is hooked from and locked. The hooks 98 and 99 are provided on the lower side of the front cover 100. The two hydraulic hoses (87B, 88R) are arranged in such a manner that the intermediate portions located mainly above the tilt cylinder 60 are adjacent to each other.

In the arrangement of the four hydraulic hoses as described above, the first hydraulic hose (87B, 88B) connected to the bottom side and the second hydraulic hose (87R, 88R) connected to the rod side are It has a portion arranged along the back side of the blade 31. That is, these four hydraulic hoses have a portion extending in the left-right direction along the back surface 41a of the blade main body 41 as a piping form.

In the present embodiment, the two hydraulic hoses (87R, 88B) connected to the left angle cylinder 32L have an intermediate portion adjacent to each other as a portion arranged along the back side of the blade 31. In particular, in the two left hydraulic hoses (87R, 88B), the left and right extension portions 87p and 88p along the upper surface 47c of the upper support plate portion 47H are arranged along the back surface 41a of the blade main body portion 41. ..

Further, the two hydraulic hoses (87B, 88R) connected to the right angle cylinder 32R have an intermediate portion adjacent to each other as a portion arranged along the back side of the blade 31. In particular, in the two hydraulic hoses (87B, 88R) for the right side, the left and right extension portions 87q and 88q located above the cylinder tube 61 of the tilt cylinder 60 are arranged along the back surface 41a of the blade main body 41. It is a part.

Further, of the four hydraulic hoses, the second hydraulic hoses (87R, 88R) connected to the rod side have a portion arranged along the cylinder tube 51. That is, each of the two hydraulic hoses (87R, 88R) connected to the rod side port 94 has a portion extending substantially in the front-rear direction along the longitudinal direction of the cylinder tube 51 as a piping form.

In the present embodiment, the left rod side hydraulic hose 87R connected to the rod side port 94 of the left angle cylinder 32L extends the front-rear extending portion 87s from the portion near the bottom side port 95 to the rod side port 94. , A portion arranged along the cylinder tube 51.

Similarly, the right rod side hydraulic hose 88R connected to the rod side port 94 of the right angle cylinder 32R is a cylinder extending a front-rear extending portion 88s from a portion near the bottom side port 95 to being connected to the rod side port 94. It is a portion arranged along the outer peripheral surface 51a of the tube 51.

Of the oil passage configurations for the left and right angle cylinders 32, the oil passage configuration on the machine side, which is on the rear side of the branch merging block 80, will be described. The first machine-side hose 83 and the second machine-side hose 84, each of which has one end connected to the left connection port 85 and the right connection port 86, are arranged from each port toward the right, and the front side erection portion 37 It is arranged in the front-rear direction along the inner side surface 33a of the right arm 33R via the upper right end portion. The other side of the first hose 83 and the second hose 84 are connected to the flow path switching valve 110 provided inside the rear portion of the right arm 33R via the connection ports 111 and 112.

The flow path switching valve 110 is fixed to the inner side surface 33a via a support plate 113 or the like at the rear portion 33d of the right arm 33R. The flow path switching valve 110 has a substantially rectangular parallelepiped outer shape, and has a front surface portion, a rear surface portion, an inner side surface portion, and a lower surface portion. The connection ports 111 and 112 are provided on the inner side surface of the flow path switching valve 110.

A hose cover 115 is provided for the front-rear extending portion of the first machine-side hose 83 and the second machine-side hose 84 along the inner side surface 33a of the right arm 33R. The hose cover 115 has an upper surface portion and an inner side surface portion forming an “L” -shaped cross section, extends in the front-rear direction, and is attached to the inside of the right arm 33R.

The hose cover 115 is provided in a range extending substantially over the portion between the front side erection portion 37 and the support cylinder portion 39 in the extension direction of the arm 33. The hose cover 115 is in a state in which the inner side surface portion is fixed by a bolt or the like to the cover support portion 116 which is a plate-shaped portion horizontally projecting from the inner side surface 33a of the right arm 33R at the central portion in the longitudinal direction. It is provided in.

The front-rear extending portions of the first machine-side hose 83 and the second machine-side hose 84 are covered from the upper side and the left side by the hose cover 115, and are supported in a state of being placed on the cover support portion 116. That is, the front-rear extending portions of the first hose 83 and the second hose 84 penetrate the tunnel-shaped portion formed by the right arm 33R and the hose cover 115, and are viewed from below by the cover support 116. It is arranged in a supported state.

Further, the first hose 83 and the second hose 84 are supported by a bent rod-shaped hose guide 117 erected between the inner side surface 33a of the right arm 33R and the upper surface of the front erection portion 37. The hose guide 117 forms a penetrating portion through which the hydraulic hose is inserted, together with the inner side surface 33a and the upper surface of the front side erection portion 37.

The flow path switching valve 110 is connected to four machine-side hydraulic hoses (not shown), which are hydraulic pipes extending forward from the traveling device 2 side, and these four machine-side hydraulic hoses are connected. The hoses are being consolidated. These machine-side hydraulic hoses form an oil passage from a direction switching valve installed in the traveling device 2 via a swivel joint, a valve, or the like provided on the machine frame 6. Connection ports 121, 122, 123, 124 for receiving a connection on one end side of the machine-side hydraulic hose are provided on the inner side surface portion, the rear surface portion, and the lower surface portion of the upper portion of the flow path switching valve 110, respectively.

The flow path switching valve 110 is covered with a flow path switching valve cover 125 along its outer shape. The flow path switching valve cover 125 is fixed to the right arm 33R via a support plate 113 or the like, and covers the flow path switching valve 110 mainly from the upper side and the left side.

The bottom side hydraulic hose 131 and the rod side hydraulic hose 132 connected to the tilt cylinder 60 extend from the flow path switching valve 110. One end of the bottom side hydraulic hose 131 and the rod side hydraulic hose 132 are connected to connection ports 133 and 134 provided on the front surface of the flow path switching valve 110, respectively, and extend toward the front tilt cylinder 60. Has been done.

Similar to the first machine side hose 83 and the second machine side hose 84, the bottom side hydraulic hose 131 and the rod side hydraulic hose 132 have a front-rear extension portion along the inner side surface 33a of the right arm 33R on the cover support portion 116. It is positioned inside the hose cover 115 in a supported state, penetrates the hose guide 117, and is connected to the tilt cylinder 60 through the right side of the branch merging block 80.

The other end side of the bottom side hydraulic hose 131 is connected to the bottom side port 135 provided on the bottom side (right side) of the cylinder tube 61 of the tilt cylinder 60 and communicating with the bottom side chamber in the cylinder tube 61. The other end of the rod-side hydraulic hose 132 is connected to a rod-side port 136 provided on the rod-side (left side) of the cylinder tube 61 and communicating with the rod-side chamber in the cylinder tube 61.

As described above, the flow path switching valve 110 is connected to the connection ports 111 and 112 for connecting the first machine side hose 83 and the second machine side hose 84, and the bottom side hydraulic hose 131 and the rod side hydraulic hose 132. Connection ports 133, 134 for receiving the connection and connection ports 121, 122, 123, 124 for receiving the connection of the flood control hose on the machine side are provided. Inside the flow path switching valve 110, an oil passage having a predetermined path portion communicating with each port is formed. According to the flow path switching valve 110, the flow path communicating from the connection ports 122 and 123 to the connection ports 133 and 134 and the flow path communicating from the connection ports 122 and 123 to the connection ports 111 and 112 are switched.

For example, when the blade 31 is rotated to the left by an angle, pressure oil is supplied to the second machine side hose 84 branched to the left rod side hydraulic hose 87R and the right bottom side hydraulic hose 87B via the flow path switching valve 110. Then, the pressure oil is discharged from the left connection port 85 branched to the left rod side hydraulic hose 87R and the left bottom side hydraulic hose 88B. Here, the branch merging block 80 branches the pressure oil pumped from the machine side into a pair of angle cylinders 32 in the second branch merging flow path 92, and a pair of angles in the first branch merging flow path 91. The pressure oil discharged from the cylinder 32 is merged. On the contrary, when the blade 31 is rotated to the right by an angle, the pressure oil is supplied to the left connection port 85 via the flow path switching valve 110, and the pressure oil is discharged from the second machine side hose 84. Here, the branch merging block 80 branches the pressure oil pumped from the machine side into a pair of angle cylinders 32 in the first branch merging flow path 91, and a pair of angles in the second branch merging flow path 92. The pressure oil discharged from the cylinder 32 is merged.

A cover 140 covering the branch merging block 80 and its vicinity is provided at the front portion of the support frame 30. The cover 140 has a peripheral wall portion 141 that surrounds the periphery of the branch merging block 80, and a flat upper surface portion 142 that covers the branch merging block 80 from above.

The peripheral wall portion 141 has an uneven shape corresponding to the shape of each portion forming the front portion of the support frame 30 on the lower side thereof, and the upper edge portion is aligned with the flat upper surface portion 142. The upper surface portion 142 is an inclined surface portion that rises forward according to the inclination of the upper surface portion 65a of the support box portion 65 that is the installation surface of the branch merging block 80.

The cover 140 has an extension portion to the right at the rear portion according to the extension form of the first machine side hose 83 and the second machine side hose 84, and forms a substantially "L" shape when viewed from above. It is configured in. The cover 140 has a front opening 140a having an opening on the front side thereof, and secures an arrangement path of a hydraulic hose extending forward from the branch merging block 80 and connected to the left and right angle cylinders 32.

Further, the cover 140 has a rear opening 140b for securing an arrangement path of the hydraulic hose on the rear side of the extension portion to the right of the rear portion. The first machine body side hose 83 and the second machine body side hose 84 extend from the inside of the cover 140 to the rear side through the rear opening 140b. Further, the bottom side hydraulic hose 131 and the rod side hydraulic hose 132 connected to the tilt cylinder 60 are arranged so as to pass through the cover 140 by the front opening 140a and the rear opening 140b of the cover 140.

According to the excavation work machine 1 according to the present embodiment having the above configuration, in the oil passage configuration for flood control with respect to the left and right angle cylinders 32 for rotating the blade 31 for soil removal, the angle cylinder The risk of damage to the hydraulic hose connected to 32 can be reduced.

That is, like the earth removal device 4 according to the present embodiment, the branch merging block 80 for branching the hydraulic hoses (87R, 87B, 88R, 88B) connected to the left and right angle cylinders 32 and extending them to the front side is provided. According to the provided configuration, the arrangement range of the hydraulic hoses connected to the left and right angle cylinders 32 can be compactly summarized. As a result, it is possible to reduce the risk that the hydraulic hose is damaged by the earth and sand that overflows from the blade 31 toward the rear and foreign matter contained in the earth and sand during the earth removal work and the like.

In particular, as in the present embodiment, the left and right angle cylinders 32 are supported by the blade 31 with the bottom side as the front side and supported by the support frame 30 with the rod side as the rear side. In the device 4, the arrangement range of the hydraulic hose extending forward from the machine side and connected to the cylinder tube 51 tends to be widened. Therefore, by providing the branch / merging block 80, the hydraulic hoses extending from the machine side can be once integrated into the branching / merging block 80, so that the spread of the hydraulic hoses can be suppressed.

Further, since the branch merging block 80 is arranged between the left and right arms 33 constituting the support frame 30, the length of the hydraulic hose forming the oil passage with respect to the left and right angle cylinders 32 is minimized. Further, the hydraulic hoses (83, 84) extending from the machine side to the branch merging block 80 can be arranged along the inner side surface 33a of either the left or right arm 33. It will be possible. From these things, the risk of damaging the hydraulic hose can be reduced.

Further, according to the support configuration of the angle cylinder 32 with the bottom side as the front side and the rod side as the rear side, the cylinder rod 52 contains earth and sand overflowing from the blade 31 toward the rear and foreign matter contained in the earth and sand during the earth removal work and the like. It is possible to prevent the cylinder tube 51 from entering the cylinder tube 51 through a gap between the cylinder tube 51 and the bush provided on the tip end side of the cylinder tube 51. As a result, it is possible to prevent the angle cylinder 32 from malfunctioning due to the intrusion of earth and sand while protecting the hydraulic hose by the branching / merging block 80. As a result, stable operation can be ensured for the angle rotation of the blade 31.

Further, in the earth removal device 4 of the present embodiment, the branch merging block 80 is attached to a beam member provided between the left and right arms 33. According to such a configuration, the branch merging block 80 can be easily installed by utilizing the existing configuration of the support frame 30.

Further, in the earth removal device 4 of the present embodiment, the branch merging block 80 is arranged at the front portion of the support frame 30. According to such a configuration, in the support configuration of the angle cylinder 32 with the bottom side as the front side and the rod side as the rear side, a hydraulic hose extending from the branch merging block 80 and connected to the cylinder tube 51 of the angle cylinder 32. In particular, the lengths of the right bottom side hydraulic hose 87B and the left bottom side hydraulic hose 88B connected to the bottom side can be shortened. This can effectively reduce the risk of damage to the hydraulic hose. Further, since the length of the hydraulic hose can be shortened, it is possible to reduce the cost of replacing the hydraulic hose even if the hydraulic hose is damaged.

Further, according to the configuration in which the branch merging block 80 is arranged at the front portion of the support frame 30, the branch merging block 80 is located at a portion extending forward from the machine side. Therefore, the hydraulic hose connected to the branch merging block 80, particularly the hydraulic hose extending forward from the branch merging block 80, can be easily replaced or maintained due to damage or the like.

Further, in the earth removal device 4 of the present embodiment, the branch merging block 80 is arranged at the left and right central portions of the support frame 30. According to such a configuration, the lengths of the hydraulic hoses extending from the branch merging block 80 and connected to the left and right angle cylinders 32 can be made equal, so that the oil pressure connected to one of the angle cylinders 32 can be equalized. It is possible to prevent the hose from being lengthened with respect to the hydraulic hose connected to the other angle cylinder 32. As a result, it is not necessary to bypass the hydraulic hose connected to the angle cylinder 32, and the arrangement range of the hydraulic hose can be compactly summarized. As a result, the risk of damage to the hydraulic hose can be effectively reduced.

In particular, the hydraulic hoses connected to the left and right angle cylinders 32, which perform opposite expansion and contraction operations on the left and right when the blade 31 is rotated at an angle, move separately as each angle cylinder 32 expands and contracts. There is a problem that the movement of the hose becomes complicated and it is difficult to protect the hydraulic hose by design. In this regard, the movement of the hydraulic hose becomes more complicated because the blade 31 is tilted by the expansion and contraction operation of the tilt cylinder 60 together with the angle rotation of the blade 31.

Therefore, by providing the branch merging block 80, the hydraulic hose extending from the machine side is branched from the branch merging block 80 arranged in the center of the left and right, and is connected to the left and right angle cylinders 32. The hydraulic hoses can be arranged symmetrically on the left and right sides, and can be moved symmetrically on the left and right sides. As a result, the movement of the hydraulic hose accompanying the operation of the blade 31 can be simplified, and the hydraulic hose can be easily protected.

Further, in the earth removal device 4 of the present embodiment, the hydraulic hoses extending from the branch merging block 80 and connected to the left and right angle cylinders 32 are left and right as portions arranged along the back side of the blade 31. The stretched portions 87p, 88p, 87q, 88q are provided, and the left rod side hydraulic hose 87R and the right rod side hydraulic hose 88R have front and rear stretched portions 87s, 88s as portions arranged along the cylinder tube 51.

According to such a configuration, the hydraulic hose can be protected by the blade 31 and the cylinder tube 51, so that the risk of damage to the hydraulic hose can be effectively reduced. Further, since each hydraulic hose has a portion arranged along the back side of the blade 31, the cover can be attached to the blade 31 relatively easily, for example, the front cover 100 or the like. A cover for protecting the hydraulic hose can be easily provided.

Further, since the hydraulic hoses (87R, 88R) connected to the rod side have a portion arranged along the cylinder tube 51, it is possible to suppress the hydraulic hose from bending due to the expansion and contraction of the angle cylinder 32. can. This can effectively reduce the risk of damage to the hydraulic hose.

Further, in the configuration provided with the left and right angle cylinders 32 and the tilt cylinder 60 for tilting and rotating the blade 31 as in the earth removal device 4 of the present embodiment, the arrangement is provided around the support frame 30. As the number of hydraulic hoses increases, the arrangement of the hydraulic hoses tends to be complicated. Therefore, the hydraulic hoses connected to the left and right angle cylinders 32 are aggregated in the branch merging block 80 and separated from the hydraulic hoses connected to the tilt cylinder 60, so that the arrangement mode of the hydraulic hoses is simple. Can be.

Further, the earth removal device 4 of the present embodiment has the following configuration. That is, the soil discharging device 4 receives the connection of the hydraulic hose extending from the machine side inside the rear end portion of one of the left and right arms 33, and the flood pressure connected to the left and right angle cylinders 32 and the tilt cylinder 60. It has a flow path switching valve 110 that receives a hose connection. Further, a part of four hydraulic hoses of the first machine side hose 83 and the second machine side hose 84 for the left and right angle cylinders 32, and the bottom side hydraulic hose 131 and the rod side hydraulic hose 132 connected to the tilt cylinder 60. Are arranged along the inner side surface 33a of the right arm 33R in a grouped state.

Further, in the front part of the support frame 30, a cover 140 covering the branch merging block 80 is provided, and the bottom side hydraulic hose 131 and the rod side hydraulic hose 132 connected to the tilt cylinder 60 are arranged in the cover 140. Has been done. The six hydraulic hoses connected to the left and right angle cylinders 32 and the tilt cylinder 60 are located on the left and right central portions of the support frame 30 and on the upper side of the front portion of the cover 140 from the front opening 140a to the front side. It extends to. That is, the six hydraulic hoses connected to each cylinder are gathered in one place of the front opening 140a of the cover 140 located in front of the branch merging block 80, and are distributed to the left and right from the front opening 140a. It is arranged in.

According to the earth removal device 4 having the above configuration, it is possible to neatly and simply arrange the hydraulic hoses connected to the three cylinders for the angle rotation and tilt rotation of the blade 31. The hydraulic hose can be easily protected. Further, in the present embodiment, the four hydraulic hoses arranged along the inside of the right arm 33R are provided with hose covers 115 to steadily protect these hydraulic hoses from earth and sand. Can be done.

The construction machine according to the present invention described using the embodiment as described above is not limited to the above-described embodiment, and various aspects can be adopted within the scope of the gist of the present invention.

In the above-described embodiment, the branch merging block 80 is provided at a position above the support bracket portion 42 constituting the support frame 30, but the arrangement position of the branch merging block 80 is not particularly limited. .. For example, the branch merging block 80 may be provided above the front erection portion 37 erected between the front portions of the left and right arms 33. Further, the branch merging block 80 may be provided for one of the left and right arms 33. Further, a support member for providing the branching / merging block 80 may be separately installed between the left and right arms 33.

Regarding the arrangement position of the branch merging block 80, in the above-described embodiment, the branch merging block 80 is arranged at the front portion of the support frame 30, but may be arranged at the rear portion of the support frame 30. In this case, for example, the branch merging block 80 is provided on the upper side of the support cylinder portion 39 erected between the left and right arms 33 via a support portion such as a support base. According to the configuration in which the branch merging block 80 is arranged at the rear part of the support frame 30 in this way, the branch merging block 80 can be separated rearward from the blade 31, so that the hydraulic pressure connected to the branch merging block 80 is connected. It is possible to reduce the risk that the hose is damaged by the earth and sand that overflows from the blade 31 toward the rear.

In the above-described embodiment, the branch merging block 80 having a rectangular parallelepiped outer shape is adopted as the oil passage branching portion according to the present invention, but the embodiment of the oil passage branching portion according to the present invention is described above. It is not limited to the form. The oil passage branching portion according to the present invention has a configuration in which a branch flow path is formed so as to receive a connection of a hydraulic hose extending from the machine side and branch to a hydraulic hose connected to the left and right angle cylinders. The form and the like are not limited.

1 Excavation work machine (construction machine)
2 Traveling device 4 Soil removal device 30 Support frame 31 Blade (soil removal plate)
32 Angle cylinder 33 Arm 36 Front erection plate part 37 Front erection part 41 Blade body part 42 Support bracket part 51 Cylinder tube 52 Cylinder rod 60 Tilt cylinder 65 Support box part 80 Branch merging block (oil channel branch merging part)
83 1st machine side hose 84 2nd machine side hose 87B Right bottom side hydraulic hose (1st hydraulic hose)
87R Left rod side flood control hose (second hydraulic hose)
87p Left and right extension part 87q Left and right extension part 87s Front and rear extension part 88B Left bottom side hydraulic hose (first hydraulic hose)
88R Right rod side flood control hose (second hydraulic hose)
88p Left and right stretched part 88q Left and right stretched part 88s Front and rear stretched part 100 Front cover 115 Hose cover 131 Bottom side hydraulic hose 132 Rod side hydraulic hose 140 cover

Claims (6)

1. A construction machine with a soil removal device
   The earth removal device
   A support frame that includes a pair of left and right arms that are vertically rotatable on the machine side,
   An earth removal plate rotatably supported in the front-rear direction in front of the support frame,
   An angle cylinder that is attached to each of the pair of left and right arms, connects the arm and the soil removal plate, and rotates the soil removal plate in the front-rear direction.
   It is provided with an oil passage branching and merging portion in which the pressure oil pumped from the machine side is branched into the pair of angle cylinders and the pressure oil discharged from the pair of angle cylinders is merged.
   A construction machine characterized in that the oil passage branch merging portion is arranged between the pair of left and right arms in the left-right direction.
2. The construction machine according to claim 1, wherein the oil channel branch merging portion is attached to a beam member provided between the pair of left and right arms.
3. The construction machine according to claim 1 or 2, wherein the oil channel branch merging portion is arranged at the left and right central portions of the support frame.
4. The construction machine according to any one of claims 1 to 3, wherein the oil channel branch merging portion is arranged at a front portion of the support frame.
5. The construction machine according to any one of claims 1 to 3, wherein the oil channel branch merging portion is arranged at the rear portion of the support frame.
6. Any of claims 1 to 5, wherein the angle cylinder is provided with the cylinder tube side supported by the back side of the earth removal plate and the cylinder rod side supported by the support frame. The construction machine described in item 1.
   

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