Hydraulic shovel provided with roller compacting device

Abstract

To provide a hydraulic shovel equipped with a compaction roller device that can shorten the time required for a ground leveling work, save labor, and improve efficiency at low cost.SOLUTION: A hydraulic shovel comprises: a lower traveling body; an upper rotating body; an articulated work device provided in front of the upper rotating body so as to be elevatable; and an earth removal plate disposed in front of the lower traveling body so as to rotate in a vertical direction. The hydraulic shovel comprises a roller compaction device disposed in a rear of the lower traveling body so as to rotate in a vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hydraulic excavator equipped with a roller compaction device. [Background technology]

[0002] Hydraulic excavators used for excavating and leveling soil and sand piles generally comprise a lower traveling body equipped with left and right endless track covers (crawlers), an upper rotating body rotatably mounted on the lower traveling body, a multi-jointed attachment (working device) consisting of a boom, arm, and bucket mounted on the upper rotating body so that it can be raised and lowered, and a blade rotatably mounted on the front side of the lower traveling body (see Patent Document 1). Hydraulic excavators to which no blade is connected are also used for excavation and leveling work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-49685 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, hydraulic excavators are used in leveling work to remove unnecessary trees, buried objects, and sediments from unleveled land, and to cut and pile up the ground with a difference in elevation to finish it into a flat land. Hydraulic excavators dig up soil and sand with a bucket, and after the soil is excavated, the bucket is used to level the surface, and the hydraulic excavator is moved back and forth to perform self-weight compaction with a crawler (Caterpillar (registered trademark)). In addition, in the case of hydraulic excavators that have a blade, the blade is used to erase the tracks made by the crawler. In addition, in the case of hydraulic excavators that do not have a blade, after leveling the surface of the soil and sand with the bucket, the hydraulic excavator is moved back and forth, and the bucket is slid back and forth on the ground to perform compaction. However, there are some places that cannot be compacted by simply moving the hydraulic excavator back and forth and compacting the ground with the crawler, blade, or bucket, and unevenness occurs on the leveled ground.

[0005] As a method of compacting the ground using construction machinery other than hydraulic excavators, there are methods using road rollers, tire rollers, or rammers. To perform compaction using a road roller, tire roller, or rammer, a separate process was required in which the hydraulic excavator was once moved from the operation site and the ground was leveled using a road roller, tire roller, or rammer. Therefore, in addition to the hydraulic excavator, new construction machinery such as a road roller was required for the ground leveling and compaction work, and the manpower, cost, and time required to operate multiple construction machinery were required, making it inefficient.

[0006] An object of the present invention is to provide a multi-functional hydraulic excavator that improves ground leveling operations by attaching a roller compaction device to the undercarriage of the hydraulic excavator. [Means for solving the problem]

[0007] In order to achieve the above object, a hydraulic excavator according to one aspect of the present invention is a hydraulic excavator comprising a lower traveling body equipped with two crawlers, an upper rotating body rotatably provided on the lower traveling body, a multi-jointed working device consisting of a boom, an arm and a bucket which are provided on the upper rotating body so as to be able to be raised and lowered, and a blade arranged in front of the lower traveling body so as to be able to be raised and lowered in the vertical direction, the blade being connected to one end of a pair of left and right blade support arms each having one end attached to a front side of a traveling body frame which constitutes a framework of the lower traveling body, and the other end of a blade hydraulic cylinder which has one end attached to the front side of the traveling body frame and which raises and lowers the blade in the vertical direction, the blade hydraulic cylinder extending and contracting to raise and lower the blade in the vertical direction, A roller compaction device is arranged behind the lower running body, and the roller compaction device comprises a compaction roller, a pair of compaction roller support arms, one end of which is attached to the rear side of the running body frame and the other end of which is used to support the compaction roller, a compaction roller hydraulic cylinder, one end of which is attached to the rear side of the running body frame and the other end of which is used to raise and lower the compaction roller in the vertical direction, and a roller holding part attached to the compaction roller support arm and holds the compaction roller, the other end of the compaction roller hydraulic cylinder being attached to the roller holding part, and the compaction roller hydraulic cylinder extending and contracting to raise and lower the compaction roller in the vertical direction together with the roller holding part.

[0008] Alternatively, a hydraulic excavator in one aspect of the present invention is a hydraulic excavator comprising a lower traveling body equipped with two crawlers, an upper rotating body rotatably mounted on the lower traveling body, and an articulated working device consisting of a boom, an arm, and a bucket mounted on the upper rotating body so as to be able to be raised and lowered, wherein a roller compaction device is disposed behind the lower traveling body, and the roller compaction device comprises a compaction roller, a pair of left and right compaction roller support arms having one end attached to the rear side of the traveling body frame that constitutes the framework of the lower traveling body and supporting the compaction roller via the other end, a compaction roller hydraulic cylinder having one end attached to the rear side of the traveling body frame and raising and lowering the compaction roller in the vertical direction via the other end, and a roller holding part attached to the roller support arm and holding the compaction roller, the other end of the compaction roller hydraulic cylinder being attached to the roller holding part, and the compaction roller hydraulic cylinder extending and contracting so as to raise and lower the compaction roller in the vertical direction together with the roller holding part.

[0009] The length of the blade and the roller in the vehicle body width direction is equal to or less than the vehicle body width of the hydraulic excavator including the two crawlers.

[0010] In this embodiment, when carrying out ground leveling and compaction work, unevenness in the soil surface caused by areas that have been compacted by the crawler under its own weight and areas that have not been compacted under its own weight is eliminated.

[0011] In a hydraulic excavator according to one aspect of the present invention, one end of the blade support arm is removably and rotatably supported on the front side of the running body frame, the other end of the blade support arm is fixed to a rear side of the blade, one end of the blade hydraulic cylinder is removably and rotatably supported on the front side of the running body frame, the other end of the blade hydraulic cylinder is removably and rotatably supported on the rear side of the blade, one end of the compaction roller support arm is removably and rotatably supported on the rear side of the running body frame, the other end of the compaction roller support arm is fixed to a surface of the roller holding part that faces the rear side of the running body frame, one end of the compaction roller hydraulic cylinder is removably and rotatably supported on the rear side of the running body frame, and the other end of the compaction roller hydraulic cylinder is removably and rotatably supported on the surface of the roller holding part that faces the rear side of the running body frame.

[0012] With this configuration, the blade can be removed from the running body frame, and the blade hydraulic cylinder can be removed from the running body frame and the blade. This facilitates maintenance of the blade, and facilitates maintenance of the blade hydraulic cylinder and inspection work for oil leaks, etc. Similarly, the roller holding part can be removed from the running body frame, and the roller hydraulic cylinder can be removed from the running body frame and the roller holding part. This facilitates maintenance of the roller holding part, and maintenance of the roller hydraulic cylinder, and inspection work for oil leaks, etc.

[0013] In one embodiment of the hydraulic excavator of the present invention, one end of the roller support arm is removably and rotatably supported on the rear side of the running body frame, the other end of the roller support arm is fixed to a surface of the roller holding part facing the rear side of the running body frame, one end of the roller hydraulic cylinder is removably and rotatably supported on the rear side of the running body frame, and the other end of the roller hydraulic cylinder is removably and rotatably supported on the surface of the roller holding part facing the rear side of the running body frame.

[0014] In this embodiment, the roller holding part can be removed from the running body frame, and the pressure roller hydraulic cylinder can be removed from the running body frame and the roller holding part, which makes it easy to perform maintenance of the roller holding part and the pressure roller hydraulic cylinder, and to inspect for oil leaks, etc. Effect of the Invention

[0015] According to the embodiment of the present invention, since excavation, ground leveling, and rolling compaction can be performed using only the hydraulic excavator, a multi-functional hydraulic excavator with improved workability can be realized.

[0016] The roller compaction device described in the embodiment of the present invention plays the same role as a blade or outrigger during excavation by extending the hydraulic cylinder of the compaction roller, moving the compaction roller downward to contact the ground and apply pressure to the contact surface. An outrigger for construction machinery is a device that stabilizes the vehicle body by extending it to the side of the vehicle body and contacting the ground when extending the arm or suspending an object on a crane vehicle, aerial work vehicle, concrete pump vehicle, etc. Therefore, when the roller compaction device is used, the tipping fulcrum of the hydraulic excavator moves to the contact point of the compaction roller with the ground, so that the excavation force of both hydraulic excavators with and without a blade is increased by providing the roller compaction device.

[0017] In other words, since the roller compaction device described in the embodiment of the present invention can be used as an outrigger, work both in front and behind the hydraulic excavator can be carried out stably without the excavator tipping over.

[0018] In the case of a hydraulic excavator having a blade as described in the embodiment of the present invention, the blade and roller compaction device can be used simultaneously as outriggers, so that the bottom of the hydraulic excavator body can be lifted and inspection of the lower running body can be easily performed. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is an external view showing a hydraulic excavator equipped with a roller compaction device and a blade. [Diagram 2] FIG. 1 is an external view showing a hydraulic excavator equipped with a roller compaction device. [Diagram 3] FIG. 2 is a partial plan view showing a schematic view of the main structure of the front side of a lower traveling body of a hydraulic excavator equipped with a blade. [Figure 4] FIG. 2 is a partial plan view showing a schematic view of the main structure of the rear side of a lower running body to which a roller compaction device is attached. [Diagram 5] FIG. 2 is a side view showing a roller compaction device. [Figure 6a] FIG. 1 is an explanatory diagram showing a state during daily inspection work of a conventional hydraulic excavator. [Figure 6b] FIG. 2 is an explanatory diagram showing a state during daily inspection work of the hydraulic excavator having the blade according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In each drawing, arrows indicate up / down, front / rear, left / right directions.

[0021] The present invention can be applied to hydraulic excavators of various sizes, from mini hydraulic excavators to large hydraulic excavators.

[0022] 1 is an external view showing a hydraulic excavator 1 equipped with a roller compaction device and a blade according to embodiment 1. The hydraulic excavator 1 is equipped with a travellable lower traveling body 2, a rotating body 3 rotatably provided on the lower traveling body 2, a multi-jointed working device 5 consisting of a boom 6, an arm 7, and a bucket 8 provided on the front side of the rotating body 3 so as to be able to be elevated and lowered, a blade 13, and a roller compaction device 14. The upper rotating body 3 is attached so as to be able to rotate freely via a rotating cylinder 4 provided on the lower traveling body 2.

[0023] In the first embodiment, the working device 5 includes a boom 6 connected to the front side of the upper rotating body 3 so as to be rotatable in the vertical direction, an arm 7 connected to the tip of the boom 6 so as to be rotatable in the vertical direction, and a bucket 8 connected to the tip of the arm 7 so as to be rotatable in the vertical direction. The boom 6, the arm 7, and the bucket 8 rotate by driving a boom cylinder 9, an arm cylinder 10, and a bucket cylinder 11, respectively.

[0024] The lower traveling body 2 has a traveling body frame and a traveling mechanism 2a. The traveling mechanisms 2a are provided on both the left and right sides of the traveling body frame, and the left and right traveling mechanisms 2a have a pair of crawlers 12, 12. As shown in FIG. 1, the traveling mechanism 2a further has an idler 2b, a driving wheel 2c, and a traveling motor 2d. The idler 2b is disposed in front of the traveling mechanism 2a, and the driving wheel 2c is disposed in the rear of the traveling mechanism 2a. The traveling motor 2d drives the driving wheel 2c to rotate the left and right crawlers 12, 12 in the circumferential direction, causing the lower traveling body 2 to travel.

[0025] A blade 13 is disposed in front of the lower traveling body 2, and the length of the blade 13 in the vehicle body width direction is equal to or less than the width of the vehicle body of the hydraulic excavator including the left and right crawlers 12, 12. The blade 13 moves up and down.

[0026] A roller compaction device 14 that can rotate in the vertical direction is disposed on the rear side of the lower traveling body 2. The length in the vehicle body width direction of the compaction roller 15 of the roller compaction device 14 is equal to or less than the width of the vehicle body of the hydraulic excavator including the crawlers 12, 12. The compaction roller 15 is moved up and down to compact the ground surface and perform ground leveling work.

[0027] In this embodiment, the side of the lower traveling body 2 where the idler 2b is arranged is the front side, and the side where the drive wheel 2c is arranged is the rear side, but the front side and the rear side may be reversed. In this case, the blade 13 is arranged in front of the lower traveling body 2 where the drive wheel 2c is arranged, and the roller rolling device 14 is arranged behind the lower traveling body 2 where the idler 2b is arranged.

[0028] 2 is an external view showing the structure of a hydraulic excavator 1' equipped with a roller compaction device according to embodiment 2 of the present invention. The hydraulic excavator 1' according to embodiment 2 is not equipped with a blade 13. The same parts as those in the hydraulic excavator 1 are given the same reference numerals and descriptions thereof will be omitted.

[0029] In the second embodiment of the present invention, the front side and the rear side of the lower running body 2 may be reversed as in the first embodiment. In this case, the roller compaction device 14 is disposed behind the lower running body 2 on which the idler 2b is disposed. Although the roller compaction device 14 is disposed behind the lower running body 2, it may be disposed in front of the lower running body 2.

[0030] Fig. 3 is a partial plan view showing a schematic diagram of the main structure of the front side of a lower traveling body of a hydraulic excavator equipped with a blade 13. As shown in Fig. 3, the lower traveling body 2 has a machine base 16 of the lower traveling body 2 and a pair of crawlers 12, 12 attached to both the left and right sides of the machine base 16. A pair of left and right blade support arms 17, 17 and a blade hydraulic cylinder 18 arranged between these two blade support arms 17, 17 are provided on the front side of the machine base 16. The blade hydraulic cylinder 18 arranged does not have to be one, and multiple cylinders may be provided.

[0031] One end of each of the blade support arms 17, 17 is rotatably supported by a pin 20 on a pair of fixed support brackets 19 which protrude forward from the front surface of the machine base 16 with a gap therebetween. The other front ends of the blade support arms 17, 17 are fixed by welding to the rear surface of the blade 13, that is, the surface facing the front side of the machine base 16. Alternatively, the blade support arms 17, 17 may be integrally formed with the blade 13 by casting. Holes are formed in the other ends of the fixed support bracket 19 and the blade support arms 17, 17, and the fixed support bracket 19 and the blade support arms 17, 17 are rotatably supported by pins 20.

[0032] In the embodiment of the present invention, pins are used as members for supporting the blade support arms 17, 17 and the blade hydraulic cylinder 18, but this is not limited to pins, and bolts or the like can also be used instead of pins.

[0033] One end of the blade hydraulic cylinder 18 is rotatably supported by a pin 24 on a blade hydraulic cylinder mounting bracket 23 arranged on the machine base 16 in front of the lower traveling body 2. The tip of the blade hydraulic cylinder 18 is attached by a pin 22 to a blade mounting bracket 21 provided on the back surface of the blade 13 (rear of the blade 13) and in the center of the surface of the blade 13 facing the front side of the machine base 16.

[0034] By disposing the blade 13 in front of the lower traveling body 2, the blade support arms 17, 17 rotate vertically as the blade hydraulic cylinder 18 expands and contracts, and the blade 13 moves up and down. In other words, by expanding and contracting the blade hydraulic cylinder 18, the blade 13 moves up and down between an upper rotation limit position and a lower rotation limit position, which are the rotation limits of the blade support arms 17, 17, thereby making it possible for the blade 13 to come into contact with the ground and for the blade 13 to apply pressure to the contact surface.

[0035] Fig. 4 is a partial plan view showing a schematic diagram of the main structure at the rear of the lower traveling body to which the roller compaction device is attached. As shown in Fig. 4, the lower traveling body 2 has a machine base 16 and a pair of crawlers 12, 12 attached to both the left and right sides of the machine base 16. A pair of left and right compaction roller support arms 25, 25 and a compaction roller hydraulic cylinder 26 arranged in the center of these two compaction roller support arms 25, 25 are provided at the rear of the machine base 16. A plurality of compaction roller hydraulic cylinders 26 may be provided instead of one.

[0036] As shown in Figures 4 and 5, the roller holding portion 27 attached to the roller support arms 25, 25 to hold the compaction roller 15 includes a compaction roller frame 35 and a compaction roller cover 36. One end of the compaction roller support arms 25, 25 is rotatably supported by pins 29 on a pair of fixed support brackets 28 that protrude rearward from the rear side of the machine base 16 with a gap between them. The other end of the compaction roller support arms 25, 25 is fixed by welding to a surface of the compaction roller frame 35 that faces the rear side of the machine base 16. Alternatively, the compaction roller support arms 25, 25 may be integral with the compaction roller frame 35 by casting.

[0037] As shown in Figures 4 and 5, the compaction roller frame 35 extends along the axial direction of the compaction roller 15, and the other end of the support arm 35a, one end of which is attached to the compaction roller frame 35, supports the support shaft 39 of the compaction roller 15. The compaction roller support arm 35a is a plate-like member formed in a substantially rectangular shape. However, the shape of the support arm 35a is not limited to a substantially rectangular shape, and may be a member of another shape, such as a triangular shape. As shown in Figure 5, the compaction roller cover 36 is fixed to the compaction roller frame 35 so as to cover the upper part of the compaction roller 15.

[0038] The length of the roller cover 36 perpendicular to the vehicle width direction is configured to be a length that does not contact the ground when the roller device 14 is operated to move downward and the roller 15 touches the ground and compresses the ground surface.

[0039] One end of the compaction roller hydraulic cylinder 26 is rotatably supported by a pin 34 on a compaction roller hydraulic cylinder mounting bracket 33 provided on the rear side of the machine base 16. The other end of the compaction roller hydraulic cylinder 26 is attached by a pin 32 to a compaction roller mounting bracket 31 provided in the center of the surface of the compaction roller frame 35 facing the rear side of the machine base 16.

[0040] In the hydraulic excavators 1 and 1' of embodiments 1 and 2, pins are used as members for supporting the roller support arms 25, 25 and the roller hydraulic cylinder 26, but this is not limited to pins, and bolts or the like can also be used instead of pins.

[0041] In this way, the roller compaction device 14 is attached to the rear side of the lower running body 2 so that it can rotate freely in the vertical direction. By extending and retracting the roller hydraulic cylinder 26, the roller support arms 25, 25 move up and down between an upper limit rotation position and a lower limit rotation position, which are the rotation limits, and this causes the roller 15 to move up and down together with the roller holding part 27, making it possible for the roller 15 to apply pressure to the ground surface.

[0042] Conventionally, road rollers, tire rollers, rammers, etc. have been used as a method of compacting the ground using construction machinery other than hydraulic excavators. In the case of road rollers and tire rollers, the ground is compacted and flattened by its own weight, while in the case of rammers, the impact on the ground is used. In other words, since the compaction work is carried out only by the construction machinery's own weight or the impact caused by vibration, different construction machinery is used depending on the object and location to be compacted, and the construction machinery itself does not have the function of changing and adjusting the compaction pressure depending on the object and location.

[0043] According to embodiments 1 and 2 of the present invention, by adjusting the extension and retraction movement of the roller hydraulic cylinder 26 of the roller device 14, the up and down movement position of the roller 15 together with the roller holding part 27 can be adjusted, and therefore the rolling pressure of the roller 15 can be adjusted as needed for the soil surface being leveled.

[0044] In order to perform compaction on the ground using the roller compaction device 14, the hydraulic excavator 1 or 1' may be equipped with a pressure gauge that measures the pressure during compaction. The pressure gauge is necessary to respond to changes in the mechanical properties (compaction characteristics, soil strength, and rigidity) caused by the density and moisture content of the soil and sand used in the ground leveling work.

[0045] Specifically, the roller compaction device 14 applies expansion and contraction pressure to the roller holding part 27, which has the roller hydraulic cylinder 26 interposed between it and the lower running body 2, so that the roller support arms 25, 25 rotate in the vertical direction, and the roller holding part 27 moves up and down, that is, the roller 15 moves up and down. When the roller hydraulic cylinder 26 extends and pressure is applied to the roller holding part 27 to move downward, the roller 15 presses the ground. With pressure applied to the soil, the hydraulic excavator 1 or 1' is moved forward and backward. In this case, the pressure applied to the soil by the roller 15 gradually changes, so that the air inside the soil is pushed out, the gaps inside the soil become smaller, the soil particles come into firm contact with each other, the degree of adhesion inside the soil increases, and the ground is compacted.

[0046] Therefore, in a hydraulic excavator 1 having a blade 13, the compaction work is performed by moving the hydraulic excavator 1 back and forth and by compaction by the crawlers 12, 12 under their own weight and by compaction by the blade, whereas in a hydraulic excavator 1' not having a blade 13, the compaction work is performed by moving the hydraulic excavator 1' back and forth and by compaction by the crawlers 12, 12 under their own weight and by compaction by the bucket 8. By using the roller compaction device 14 of embodiments 1 and 2, the soil surface can be easily compacted and a surface finish with high flatness can be obtained after compaction.

[0047] The roller compaction range can be made wide by making the width of the compaction roller 15 in the vehicle body width direction equal to or less than the vehicle body width of the hydraulic excavator 1 or 1', that is, the width of the vehicle body including the left and right crawlers 12, 12. Whether the location where ground leveling work is being performed is a narrow soil surface that only one hydraulic excavator 1 or 1' can pass through, or a very wide soil surface, the movement range of the hydraulic excavator 1 or 1' is reduced, and work efficiency can be improved.

[0048] Conventionally, leveling and compaction work required construction machinery such as a road roller to perform compaction work in addition to a hydraulic excavator, but the present invention allows these tasks to be performed with a single hydraulic excavator 1 or 1' equipped with a roller compaction device 14, eliminating the need for construction machinery such as a road roller and improving work efficiency. In addition, the hydraulic excavator 1 or 1' can perform flattening work by controlling the compaction pressure according to the properties of the soil on which leveling and compaction work is to be performed, eliminating the need to use different construction machinery such as a road roller to perform compaction work. Furthermore, this has the excellent effect of reducing the number of people, labor, and time required to operate multiple construction machines.

[0049] In conventional hydraulic excavators equipped with blades, pressure is applied to the soil with a bucket, so the crawler on the opposite side of the excavator may lift off the ground. Therefore, the excavation work is performed on the side where the blade is installed on the undercarriage to extend the tipping fulcrum, and the blade is used as an outrigger by applying downward pressure with a hydraulic cylinder that raises and lowers the blade. The work of lowering loads with the bucket is similar to the excavation work, and the work was only performed in the direction where the blade was installed to prevent tipping. Therefore, when performing excavation work or lowering work in a direction where the blade was not installed, it was necessary to move the hydraulic excavator and change direction.

[0050] In the case of the hydraulic excavator 1 equipped with the roller compaction device 14 according to the first embodiment, the roller compaction device 14 plays the same role as the blade 13 during excavation, and therefore the roller hydraulic cylinder 26 of the roller compaction device 14 is extended and the roller holding part 27 is operated to move downward, the compaction roller 15 is brought into contact with the ground, and pressure is applied to the ground contact surface, whereby the tipping fulcrum of the hydraulic excavator 1 shifts to the ground contact point of the compaction roller 15 of the roller compaction device 14, and the excavation force is increased. In the hydraulic excavator 1' not equipped with the blade 13 according to the second embodiment, the roller compaction device 14 is operated in the same manner, and downward pressure is applied to the ground by the compaction roller 15, so that the contact point of the compaction roller 15 with the ground becomes the tipping fulcrum, and the excavation force is increased. In addition, in the hydraulic excavator 1' not having a blade in embodiment 2, the roller compaction device 14 is arranged behind the lower running body 2, but it is also possible to arrange the roller compaction device 14 in front of the lower running body 2. Therefore, even when the roller compaction device 14 is arranged in front of the lower running body 2, it performs the same function as the blade, thereby increasing the digging force and enabling stable work to be performed.

[0051] The roller compaction device 14 in embodiments 1 and 2 can be used as an outrigger, like the blade 13, so that during excavation work or lifting work, work can be performed from either the front or rear of the hydraulic excavator 1, and it is also possible to perform very stable work in either the front or rear of the hydraulic excavator 1 or 1'.

[0052] In daily inspections of hydraulic excavators, it is necessary to check the crawler tension of the traveling mechanism and the traveling motor for oil leakage, etc. This is not particularly necessary when inspecting only the exterior, but when inspecting the inside of the idler, drive wheels, traveling motor, etc., it is difficult to inspect if the crawler is in contact with the ground.

[0053] Fig. 6a is an explanatory diagram showing a state during daily inspection of a conventional hydraulic excavator. During conventional daily inspection, as illustrated in Fig. 6a, the blade hydraulic cylinder 18 of the blade 13 is extended, the blade 13 is moved downward and pressed against the ground, and the bottom of the crawlers 12, 12 on the blade 13 side is lifted. Next, the upper rotating body 3 is rotated 180° in the opposite direction to the blade 13 relative to the lower traveling body 2, the bucket 8 is pressed against the ground, the boom cylinder 9 and the arm cylinder 10 are extended, the lower traveling body 2 on the side without the blade 13 is lifted, and the crawlers 12, 12 are lifted. Therefore, the blade and the bucket support the hydraulic excavator 1 in a state where the left and right crawlers 12, 12 are lifted above the ground.

[0054] This allows you to check the tension of the crawler (Caterpillar (trademark)), check for grease leaks near the grease nipple of the crawler adjuster, oil leaks near the travel motor, etc. Also, since the crawler is raised above the ground, it can be washed.

[0055] As shown in Fig. 1, the drive wheel 2c (travel motor 2d) is arranged at one end (rear side) of the traveling body frame, the crawler adjuster (not shown) and the idler 2b are arranged in this order, and the crawler 12 is attached to the lower traveling body 2. By injecting grease through the nipple of the crawler adjuster, the cylinder part of the crawler adjuster protrudes, and by pushing out the idler 2b, the crawler 12 is pulled outward and protrudes. When inspecting the traveling mechanism 2a, the reverse procedure is performed, and the crawler 12 is removed from the lower traveling body 2 for inspection.

[0056] FIG. 6b is an explanatory diagram showing a state during daily inspection of the hydraulic excavator having the blade according to the first embodiment. In the hydraulic excavator 1 having the blade 13 according to the first embodiment, as shown in FIG. 6b, a roller compactor 14 is used instead of a bucket that has been conventionally used, and the hydraulic excavator 1 is supported in a state in which it is raised above the ground. The roller compactor 14 is rotated downward with respect to the ground in the same manner as the blade 13 by the roller hydraulic cylinder 26 of the roller compactor 14, and a downward pressure is applied, so that the lower traveling body 2 on the side without the blade 13, that is, the roller compactor 14 side, can be lifted. Therefore, the blade 13 and the roller compactor 14 can support the hydraulic excavator 1 in a state in which the left and right crawlers 12, 12 are raised above the ground, and daily inspection of the traveling can be performed stably and safely.

[0057] Furthermore, in the case of a hydraulic excavator 1 having the blade 13 according to this embodiment 1, the work device 5 consisting of the boom 6, arm 7 and bucket 8 attached to the upper rotating body 3 which was previously used during inspection work is no longer necessary, making it possible to handle heavy objects, etc. with the bucket 8 during inspection or repair of the traveling body, thereby improving work efficiency.

[0058] In detail, the hydraulic excavator 1 having the blade 13 is lifted off the ground and supported by the blade 13 and the roller compaction device 14, enabling the working device 5 to perform the following operations. (1) By holding down the idler 2b with the working device 5, the grease in the crawler adjuster is released, the idler 2b shrinks, and the crawler 12 loosens. This makes it easy to remove, install, and replace the crawler 12. (2) When removing the crawler 12 from the traveling mechanism, it is possible to use the working device 5 to attach a wire or the like to the crawler 12 and pull it with the bucket 8. In the same manner, it is possible to attach the crawler 12 to the idler 2b and the drive wheel 2c (traveling motor 2d) by the working device 5. (3) The work device 5 can use the bucket 8 to hoist and bring received items such as crawlers to the vicinity of the work site.

[0059] Therefore, according to the first embodiment, the work efficiency is also greatly improved in daily inspection work.

[0060] Although the embodiment of the present invention has been described above, the disclosed embodiment is essentially illustrative and should not be considered as being limiting. The scope of the present invention is defined by the claims, not the above meaning, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0061] 1. Hydraulic excavator 2 Undercarriage 2a Travel mechanism 2b Idler 2c Drive wheel 2d Driving motor 3. Upper rotating body 4. Swivel round body 5. Working Equipment 6. Boom 7 Arm 8. Bucket 12 Crawler 13 Earth removal plate 14 Roller compaction device 15 Roller 17 Blade support arm 18 Blade hydraulic cylinder 25 Roller support arm 26 Roller hydraulic cylinder 27 Roller holder

Claims

1. A hydraulic excavator including a lower traveling body having two crawlers, an upper rotating body rotatably provided on the lower traveling body, a multi-joint type working device including a boom, an arm, and a bucket provided on the upper rotating body so as to be capable of being raised and lowered, and a blade disposed in front of the lower traveling body so as to be capable of being raised and lowered in the vertical direction, The blade is connected to a pair of left and right blade support arms each having one end attached to the front side of a running body frame constituting a frame body of the lower running body, and to a blade hydraulic cylinder having one end attached to the front side of the running body frame for vertically raising and lowering the blade, and the blade hydraulic cylinder is adapted to extend and retract to raise and lower the blade in the vertical direction. A roller rolling device is disposed behind the lower running body, The roller compaction device includes a compaction roller, a pair of left and right compaction roller support arms having one end attached to the rear side of the traveling body frame and supporting the compaction roller via the other end, a compaction roller hydraulic cylinder having one end attached to the rear side of the traveling body frame and raising and lowering the compaction roller in the vertical direction via the other end, and a roller holding section attached to the compaction roller support arms and holding the compaction roller, A hydraulic excavator equipped with a roller compaction device, characterized in that the other end of the compaction roller hydraulic cylinder is attached to the roller holding part, and the compaction roller rises and falls in the vertical direction together with the roller holding part as the compaction roller hydraulic cylinder expands and contracts.

2. A hydraulic excavator comprising: a lower traveling body having two crawlers; an upper rotating body provided rotatably on the lower traveling body; and a multi-joint type working device including a boom, an arm, and a bucket provided on the upper rotating body so as to be capable of being raised and lowered, A roller rolling device is disposed behind the lower running body, The roller compaction device includes a compaction roller, a pair of left and right compaction roller support arms having one end attached to the rear side of the running body frame constituting the frame body of the lower running body and supporting the compaction roller via the other end, a compaction roller hydraulic cylinder having one end attached to the rear side of the running body frame and raising and lowering the compaction roller in the vertical direction via the other end, and a roller holding section attached to the roller support arms and holding the compaction roller, A hydraulic excavator equipped with a roller compaction device, characterized in that the other end of the compaction roller hydraulic cylinder is attached to the roller holding part, and the compaction roller rises and falls in the vertical direction together with the roller holding part as the compaction roller hydraulic cylinder expands and contracts.

3. 3. The hydraulic excavator according to claim 1, wherein a length of the blade and the compaction roller in a vehicle body width direction is equal to or less than a vehicle body width of the hydraulic excavator including the two crawlers.

4. One end of the blade support arm is pivotally supported on a front side of the traveling body frame so as to be detachable and rotatable, and the other end of the blade support arm is fixed to a rear surface of the blade, One end of the blade hydraulic cylinder is detachably and rotatably supported on the front side of the traveling body frame, and the other end of the blade hydraulic cylinder is detachably and rotatably supported on the back side of the blade, One end of the roller support arm is detachably and rotatably supported on the rear side of the roller and the running body frame, and the other end of the roller support arm is fixed to a surface of the roller holding part that faces the rear side of the running body frame, 4. The hydraulic excavator according to claim 1, wherein one end of the roller hydraulic cylinder is removably and rotatably supported on a rear side of the running body frame, and the other end of the roller hydraulic cylinder is removably and rotatably supported on a surface of the roller holding part that faces the rear side of the running body frame.

5. One end of the roller support arm is detachably and rotatably supported on the rear side of the roller and the running body frame, and the other end of the roller support arm is fixed to a surface of the roller holding part that faces the rear side of the running body frame, 4. The hydraulic excavator according to claim 2, wherein one end of the roller hydraulic cylinder is removably and rotatably supported on a rear side of the running body frame, and the other end of the roller hydraulic cylinder is removably and rotatably supported on a surface of the roller holding part that faces the rear side of the running body frame.

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