CN105986589B

CN105986589B - Small rotary excavator

Info

Publication number: CN105986589B
Application number: CN201610153199.0A
Authority: CN
Inventors: 大岛峰一
Original assignee: Sumitomo SHI Construction Machinery Co Ltd
Current assignee: Sumitomo SHI Construction Machinery Co Ltd
Priority date: 2015-03-20
Filing date: 2016-03-17
Publication date: 2020-09-08
Anticipated expiration: 2036-03-17
Also published as: JP6576659B2; JP2016176292A; CN105986589A

Abstract

The invention provides a small rotary excavator, which can easily reduce the height of a handrail. The small rotary shovel is provided with: a fuel tank (24) mounted on the upper slewing body (3); and a hydraulic oil tank (26) disposed inside the fuel tank (24). A reversible armrest (72) is fixed to the upper surface of the fuel tank (24).

Description

Small rotary excavator

The present application claims priority based on japanese patent application No. 2015-058714, which was filed in japanese on 3/20/2015. The entire contents of this Japanese application are incorporated by reference into this specification.

Technical Field

The present invention relates to a small revolving type shovel having a revolving body with a small radius of gyration.

Background

In order to work in a narrow space, a so-called "small turning type excavator" is known which is configured to reduce the turning radius ratio of a turning body. A boom is rotatably mounted on a front portion of a revolving body of a small revolving type shovel, and a cab is provided on a left side of the boom. An engine is disposed behind the boom as a power source. Various devices and components necessary for driving the shovel are arranged around the engine. The constituent components include a fuel tank, a hydraulic pump, a hydraulic oil tank, and components necessary for driving the engine and the hydraulic pump, and the like. (for example, refer to patent document 1).

Patent document 1: japanese patent laid-open No. 2000-144811

The above-described small revolving type excavator is provided with a handrail so that an operator who is seated on the revolving body to perform work during maintenance or oil supply can grasp the handrail. The height of the armrest is defined to extend from a position where the worker takes the feet to a position of a predetermined height.

Therefore, the armrest itself needs to be a strong structure, and the mounting portion of the armrest needs to be a strong structure. Resulting in such armrests being a costly component.

Further, since the armrest extends further upward from the upper portion of the upper slewing body, the armrest is the highest portion of the shovel. Therefore, there is a possibility that the overall height of the excavator including the handrail exceeds a prescribed height.

Disclosure of Invention

Accordingly, an object of one embodiment is to provide a small-sized swing type shovel capable of easily reducing the height of a handrail.

In order to achieve the above object, according to one embodiment of the present invention, there is provided a small revolving type shovel including: a fuel tank mounted on the upper slewing body; a working oil tank disposed inside the fuel tank; and a reversible armrest fixed to an upper surface of the fuel tank.

Effects of the invention

According to the disclosed embodiment, since the handrail can be easily laid down, the height of the entire excavator including the handrail can be reduced.

Drawings

Fig. 1 is a side view of a small revolving type shovel according to an embodiment of the present invention.

Fig. 2 is a plan view of the small revolving type shovel shown in fig. 1.

Fig. 3 is a plan view showing the inside of the upper slewing body.

Fig. 4 is a rear side view of the inside of the upper slewing body as viewed from the rear of the shovel.

Fig. 5 is a perspective view of a portion of the upper slewing body where the fuel tank and the hydraulic oil tank are mounted.

Fig. 6 is a perspective view of the armrest.

Fig. 7 is a side view of the armrest.

Fig. 8 is a perspective view showing a state where the armrest is laid down.

Description of the reference symbols

1-lower traveling body, 2-slewing mechanism, 3-upper slewing body, 3 a-slewing frame, 4-boom, 5-arm, 6-bucket, 7-boom cylinder, 8-arm cylinder, 9-bucket cylinder, 10-cab, 11-engine, 22-urea water tank cover, 24-fuel tank, 26-working oil tank, 28-counterweight, 30-hood, 32-tunnel, 34-work stand, 36-urea water tank, 38-urea water pump, 40-engine cooler, 42-intercooler, 44-air filter, 50-exhaust gas treatment device, 50-1 st exhaust gas treatment unit, 50-2 nd exhaust gas treatment unit, 54-prefilter, 56-working oil pump, 58-oil filter, 60-handrail, 70-handrail, 72-handrail, 74-handrail pipe component, 76-mounting component, 77-supporting pipe component, 78-supporting plate, 80-rotating plate, 90-muffler cover, 92-exhaust tube (muffler), 100-accommodating frame, 100-1, 100-2, 100-3-vertical frame, 102-engine bracket, 104-engine supporting component, 106-supporting plate, 150-pump chamber.

Detailed Description

Embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a side view of a small swing type shovel according to an embodiment. Hereinafter, in this specification, the small-sized shovel may be simply referred to as a "shovel". An upper revolving body 3 is mounted on a lower traveling body 1 of the excavator via a revolving mechanism 2. A boom 4 is attached to the upper slewing body 3. An arm 5 is attached to a front end of the boom 4, and a bucket 6 as a terminal attachment is attached to a front end of the arm 5. As the termination attachment, a bucket for a facade, a bucket for dredging, or the like may be used.

The boom 4, the arm 5, and the bucket 6 constitute an excavation attachment as an example of an attachment, and are hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9, respectively.

The upper slewing body 3 is provided with a cab 10 and a power source such as an engine 11. The cab 10 is provided with a driver's seat, various operation devices necessary for operating the shovel, and a controller for controlling the driving of the shovel.

In fig. 1, when the piston 9a of the bucket cylinder 9 mounted on the arm 5 is disposed on a surface having the same height as the installation surface of the crawler, the uppermost Th1 of the armrest 70 mounted on the fuel tank 24 is the highest position in the excavator. That is, the uppermost portion Th1 of the armrest 70 is higher than the uppermost portion Th2 of the armrest 60, the uppermost portion Tc of the cab, and the pipe Ta on the arm cylinder 8 mounted on the boom 4.

When the armrest 70 is turned as described later, the uppermost portion Th1 of the armrest 70 is lower than the uppermost portion Th2 of the armrest 60, the uppermost portion Tc of the cab, and any of the pipes Ta on the arm cylinder 8 mounted on the boom 4.

The upper surface of the fuel tank 24 is higher than the muffler cover 90.

Fig. 2 is a plan view of the shovel shown in fig. 1 as viewed from above. The boom 4 is supported rotatably near the center of the upper slewing body 3. A cab 10 is provided on the left side of the boom 4 in front of the upper revolving structure 3. A urea water tank cover 22 covering a urea water tank (described later) on the front side of the upper revolving structure 3 is attached to the right side of the boom 4. A fuel tank 24 and a hydraulic oil tank 26 are disposed behind the urea solution tank cover 22. The fuel tank 24 is disposed outside, and the hydraulic oil tank 26 is disposed inside the fuel tank 24.

The upper surface of the urea solution tank cover 22 and the upper surface of the operating oil tank 26 are used as passages for workers to get on during maintenance or the like. On the other hand, the upper surface of the fuel tank 24 is located higher than the upper surface of the operating oil tank 26 as described later, and is not used as a passage for workers to get on.

An armrest 60 is attached to the outer peripheral portion of the upper slewing body 3 from the urea water tank cover 22 to the fuel tank 24. Handrail 60 is a handrail for preventing a worker from rolling down and protecting the worker when the worker gets on upper revolving structure 3. The upper end of the armrest 60 extends to the end of the fuel tank 24. The armrest 70 extends from a position at the terminal end of the armrest 60 in the direction of extension of the armrest 60. The armrest 70 is attached to the upper surface of the fuel tank 24, and is curved inward along the corner of the upper surface of the fuel tank 24. The armrest 70 is provided at a position that can be grasped by a worker when the worker gets on the upper surface of the operating oil tank 26.

A muffler cover 90 that covers an exhaust gas treatment device described later is provided behind the fuel tank 24 and the hydraulic oil tank 26. An exhaust pipe (muffler) 92 extending from the exhaust gas treatment device projects from a portion of the muffler cover 90 close to the fuel tank 24.

The urea solution tank cover 22, the fuel tank 24, the hydraulic oil tank 26, the armrest 60, the armrest 70, and the muffler cover 90 are disposed on the right side of the upper slewing body 3.

As described above, the boom 4 is rotatably attached to the center of the upper slewing body 3. The shape of the rear part of the upper slewing body 3 is limited by the slewing radius of the excavator and is an arc shape of the slewing radius. A counter weight 28 is disposed at the center of the rear part of the upper slewing body 3. The engine 11 is disposed and fixed in a space between the counter weight 28 and the boom 4. In fig. 1 and 2, the engine 11 is not visible because of the hood 30 covering the upper part of the engine 11.

The front side of the hood 30 is provided with a passage 32 through which an operator gets on when the hood 30 is opened and the maintenance work of the engine 11 is performed. A work stand 34 is provided at a position lower than the duct 32 on the front side of the duct 32. The work stand 34 is provided so as to cover the swing motor disposed near the hydraulic oil tank 26, and also functions as a swing motor cover. When the worker is boarding the upper passage 32, he first boards the lower work foothold 34 and then boards the upper passage 32. At this time, the worker can easily get on the passage 32 from the work foothold 34 by putting his hand on the portion of the end portion of the armrest 70 extending in the vertical direction.

Next, the arrangement of each component in the upper revolving structure 3 will be described in more detail with reference to fig. 3 and 4. Fig. 3 is a plan view showing the inside of upper slewing body 3. Fig. 4 is a rear side view of the inside of the upper slewing body 3 as viewed from the rear of the shovel. Fig. 3 is a schematic view showing the inside of the urea solution tank cover 22, the muffler cover 90, the hood 30, and the like, all of which are removed. Fig. 4 schematically shows the constituent components in a state where the counter weight 28 disposed at the rear portion of the upper slewing body is removed.

As shown in fig. 3, a urea water tank 36 is disposed on the revolving frame 3a of the upper revolving structure 3 on the right side of the front portion, and a fuel tank 24 and a hydraulic oil tank 26 are disposed behind the urea water tank. A urea water pump 38 for supplying urea water to an exhaust gas treatment device described later is disposed behind the urea water tank 36 and in front of the hydraulic oil tank 26.

The engine 11 is disposed at the center of the rear part of the upper slewing body 3. An engine cooler 40 and an intercooler 42 are disposed on the side where the fan of the engine 11 is disposed (the left side of the engine 11). An air filter 44 for filtering air supplied to the engine 11 is disposed further outside the intercooler 42. In this way, various devices attached to the engine 11 are disposed on the left side of the engine 11, and it is difficult to secure a space for disposing a large device such as an exhaust gas treatment device.

Therefore, in the present embodiment, the exhaust gas treatment device 50 is disposed above the right pump chamber 150 (see fig. 4) of the engine 11. However, since the exhaust gas treatment device 50 is a large device, the longitudinal axis thereof is disposed so as to be inclined with respect to the front-rear direction of the upper revolving structure 3. By arranging exhaust gas treatment device 50 at an angle in this manner, exhaust gas treatment device 50 can be entirely accommodated within the radius of rotation of upper slewing body 3 above pump chamber 150.

Further, by disposing the exhaust gas treatment device 50 above the pump chamber 150, the exhaust gas treatment device 50 can be disposed at a lower position with respect to the engine 11. Therefore, the exhaust pipe (muffler) 92 extending upward from the exhaust gas treatment device 50 can be made lower than a predetermined height required for the small-sized excavator.

Here, the exhaust gas treatment device 50 will be briefly described. In the present embodiment, a diesel engine is used as the engine 11, and an exhaust gas treatment device 50 is required to meet exhaust gas control regulations. The exhaust gas treatment device 50 is provided in an exhaust system of the engine 11, and treats exhaust gas of the engine to convert the exhaust gas into exhaust gas satisfying exhaust gas management regulations.

The exhaust gas treatment device 50 includes a 1 st exhaust gas treatment unit (particulate filter) 50-1 and a 2 nd exhaust gas treatment unit (catalyst reduction device) 50-2, and the 2 nd exhaust gas treatment unit 50-2 is disposed above the 1 st exhaust gas treatment unit 50-1. An exhaust pipe (muffler) 92 extends from the upper part of the 2 nd exhaust gas treatment unit 50-2.

The exhaust gas discharged from the engine 11 is first supplied to the 1 st exhaust gas treatment unit 50-1. In the 1 st exhaust treatment unit 50-1, particulates in the exhaust gas are trapped by the filter device. Then, the exhaust gas from which the particulates are removed is supplied to the 2 nd exhaust treatment portion 50-2 provided with the NOx reducing catalyst. In the 2 nd exhaust treatment unit 50-2, nitrogen oxides (NOx) in the exhaust gas are reduced by the NOx reduction catalyst. The thus purified exhaust gas is discharged to the atmosphere from an exhaust stack (muffler) 92 of the exhaust gas treatment device 50.

The exhaust gas treatment section 2 is a catalyst reduction device, and uses a urea water (urea aqueous solution) as a liquid reducing agent to continuously reduce NOx. The urea water supplied to the 2 nd exhaust gas treatment unit is stored in the urea water tank 36, and is pressurized and fed to the 2 nd exhaust gas treatment unit of the exhaust gas treatment device 50 by the urea water pump 38.

As described above, the exhaust gas treatment device 50 is disposed above the pump chamber 150. In order to dispose exhaust gas treatment device 50 above pump chamber 150, housing frame 100 on which exhaust gas treatment device 50 is mounted is formed on revolving frame 3a of upper revolving unit 3.

As shown in FIG. 4, the receiving frame 100 has the foot members of the frame, i.e., 3 vertical frames 100-1, 100-2, 100-3. An exhaust gas treatment device 50 is mounted on a lateral frame 100-4 supported by the vertical frames 100-1, 100-2, and 100-3.

Of the 3 vertical frames 100-1, 100-2, 100-3, 2 vertical frames 100-1, 100-2 are fixed to revolving frame 3a of upper revolving unit 3 via engine support member 104 to which engine mount 102 for mounting engine 11 is fixed. Specifically, a support plate 106 is fixed between the upper end of an engine support member 104 fixed to the revolving frame 3a and the engine mount 102, and the vertical frame 100-1 is fixed to the support plate 106. Accordingly, the vertical frame 100-1 extends upward from the support plate 106. The vertical frame 100-2 is similarly fixed to a support plate 106 (not shown) and extends upward from the support plate 106. On the other hand, the vertical frame 100-3 is directly fixed to the revolving frame 3a of the upper revolving structure 3.

In this way, by using the engine support member 104 for mounting the engine 11 as a part of the vertical frames 100-1 and 100-2 for mounting the housing frame 100 of the exhaust gas treatment device 50, the area of the fixed portion of the frame on the revolving frame 3a can be reduced. This enables a large number of devices to be mounted on the narrow revolving frame 3 a.

Further, the housing frame 100 for mounting the exhaust gas treatment device 50 is mounted with equipment disposed in the pump chamber 150. For example, a main filter that discharges fuel supplied from the fuel tank 24 to the engine 11 from a pump and filters the fuel is attached to the lateral frame 100-4 of the housing frame 100. The pre-filter 54 for filtering the fuel before it is sucked into the pump is attached to a connecting member for connecting the 2 vertical frames 100-2 and 100-3. An oil filter 58 filtering the working oil is installed on the vertical frame 100-3 of the receiving frame. The working oil pump 56 driven by the engine 11 is fixed to one end of the engine 11. In this way, the housing frame 100 for mounting the exhaust gas treatment device 50 is also used to fix various devices disposed in the pump chamber 150. The exhaust gas treatment device 50 is not necessarily provided.

Similarly to the exhaust gas treatment device 50, the lateral frame 100-4 is disposed so as to be inclined with its longitudinal axis inclined with respect to the front-rear direction of the upper revolving structure 3. The side surfaces of the lateral frame 100-4 in the longitudinal direction face side covers provided on both sides of the counter weight 28. Thus, when the worker opens the side cover, the worker can easily perform maintenance work of the filter and the like attached to the housing frame 100.

Next, the arrangement and structure of the fuel tank 24 and the hydraulic oil tank 26 will be described with reference to fig. 5. Fig. 5 is a perspective view of a portion of the upper slewing body where the fuel tank 24 and the hydraulic oil tank 26 are mounted.

As shown in fig. 5, the fuel tank 24 and the hydraulic oil tank 26 are arranged on the right side of the substantially center of the upper slewing body 3 in the front-rear direction. The fuel tank 24 is located outside and the hydraulic oil tank 26 is located inside. The exhaust gas treatment device 50 is disposed obliquely behind the fuel tank 24 and the hydraulic oil tank 26, but is covered with a muffler cover 90, which is not shown in fig. 5. However, an exhaust pipe (muffler) 92 extending from the exhaust gas treatment device 50 extends upward through the muffler cover 90.

A hood 30 is provided beside the muffler cover 90. The hood 30 is a cover that covers the engine 11. When performing maintenance work on the engine 11, the worker opens the hood 30 to access the engine 11 on the rear surface.

In the present embodiment, the upper surface of the hydraulic oil tank 26 is configured to be used as a passage through which an operator can get on and off. On the other hand, the upper surface of the fuel tank 24 disposed outside the hydraulic oil tank 26 is located higher than the upper surface of the hydraulic oil tank 26. That is, the fuel tank 24 is formed in a shape having a height higher than that of the hydraulic oil tank 26. Therefore, the fuel tank 24 can store a large amount of fuel corresponding to the height that can be increased.

When the fuel tank 24 is refilled with fuel, the operator gets onto the upper surface of the hydraulic oil tank 26 and injects fuel from the fuel fill inlet 24a provided in the upper surface of the fuel tank 24. The oil supply port 24a is provided at a position inside the armrest 70 bent at about 90 degrees. Therefore, the operator in refueling can grasp the armrest 70 attached to the upper surface of the fuel tank 24 to support his or her body.

Generally, a balustrade such as a handrail 70 is defined to have a prescribed height from the passageway. In the present embodiment, since the passage is the upper surface of the hydraulic oil tank 26, the height of the armrest 70 may be a predetermined height from the upper surface of the hydraulic oil tank 26. Therefore, the height of the armrest 70 itself may be obtained by subtracting the height from the upper surface of the hydraulic oil tank 26 to the upper surface of the fuel tank 24 from a predetermined height. That is, in the present embodiment, the height of the armrest 70 itself can be reduced in accordance with the amount by which the fuel tank 24 is raised. Further, the height from the work foot 34 to the armrest can be sufficiently secured.

Since the armrest 70 can be of a relatively low structure, the force (moment) applied to the mounting portion of the armrest 70 is also reduced, and the strength of the armrest 70 itself can be made lower than that required for conventional armrests. This eliminates the need to provide the armrest 70 with a strong structure as in the conventional armrest. Further, since the armrest 70 has a low structure, the force (moment) applied to the portion where the armrest 70 is attached to the fuel tank 24 is also reduced. Therefore, the mounting portion of the armrest 70 does not need to have a structure as strong as the conventional armrest mounting structure.

Here, the armrest 72 extends between an exhaust pipe (muffler) 92 that is located behind the fuel tank 24 and extends upward from a muffler cover 90, and the fuel tank 24. That is, the exhaust pipe (muffler) 92 is disposed outside the curved handrail 70. This can protect the worker from accidentally touching the exhaust pipe (muffler) 92 heated by the engine exhaust gas, the worker working in the vicinity of the fuel tank 24.

The armrest 70 is bent at about 90 degrees along the outer corner of the upper surface of the fuel tank 24, and has a vertical portion (corresponding to the vertical portion 74b-2 shown in fig. 6) extending in the vertical direction near the inner corner of the fuel tank 24. The worker who performs work by climbing on the swing motor cover functioning as the work foothold 34 can support the body by gripping the vertical portion of the armrest.

As described above, in the present embodiment, the hydraulic oil tank 26 is disposed inside the fuel tank 24, and the upper surface of the fuel tank 24 is made higher than the upper surface of the hydraulic oil tank 26, so that the passage for the worker is secured as the upper surface of the hydraulic oil tank 26, and the fuel tank 24 can be made larger to store more fuel. In addition, the armrest 70 itself and the attachment portion thereof can be configured to have a rigidity smaller than that required for a conventional armrest.

Next, the armrest according to the present embodiment will be further described with reference to fig. 6 to 8. Fig. 6 is a perspective view of an armrest according to the present embodiment. Fig. 7 is a side view of the armrest according to the present embodiment. Fig. 8 is a perspective view showing a state in which the armrest according to the present embodiment is laid down. The shape of the armrest 72 shown in fig. 6 to 8 is slightly different from the shape of the armrest 70 shown in fig. 5, but the armrest 72 will be described as the same member as the armrest 70.

As shown in fig. 6, the handrail 72 has a handrail tube member 74 made by bending a pipe material and 2 mounting portions 76. The armrest tube member 74 has a

horizontal portion

74a and 2 vertical portions 74b-1, 74 b-2. The horizontal portion 74a is bent almost at a right angle so as to follow the corner of the upper surface of the fuel tank 24. Further, a reinforcing pipe member 74c bent into almost the same shape as the horizontal portion 74a is provided between 2 mounting portions 76. Further, a reinforcement pipe member 74d extending in the vertical direction is provided from one side upper end of the mounting portion 76 to the horizontal portion 74a of the handrail member 74. The reinforced pipe member 74c is provided as necessary.

The handle pipe member 74 is provided with a rotating plate 80 at each of the lower end of the vertical portion 74b-1 and the lower end of the vertical portion 74 b-2. The 2 mounting portions 76 fixed to the upper surface of the fuel tank 24 each include a support pipe member 77 and a support plate 78 fixed to the support pipe member 77. The support pipe member 77 has a larger cross section (outer diameter) than the handrail pipe member, and the support pipe member 77 is strong. The cross section of the support tube member 77 is not limited to a circular tube member, and may be a tube member having a polygonal cross section, a member having an H-shaped cross section, or the like as long as it has sufficient strength.

The pair of rotating plates 80 attached to the armrest tube member 74 are rotatably attached to the pair of support plates 78 via rotating shafts 80a, respectively. Thereby, the handrail member 74 is rotatably supported by the mounting portion 76. Therefore, as shown in fig. 8, the armrest 72 can be laid down almost 90 degrees toward the upper surface of the fuel tank 24.

When the excavator is driven, as shown in fig. 6 and 7, the armrest 72 is fixed at a position where the vertical portions 74b-1, 74b-2 are vertical. To fix the armrest 72, first, the bolt fixing hole 80b provided in the rotating plate 80 is aligned with one of the 2 bolt fixing holes 78b provided in the support plate 78. The 2 bolt fixing holes 78b provided in the support plate 78 are disposed at equal distances from the rotary shaft 80a that rotatably supports the rotary plate 80. Bolts may be inserted through the bolt fixing holes 80b and the bolt fixing holes 78b, and nuts may be screwed into the bolts to fasten and fix the rotating plate 80 and the support plate 78.

On the other hand, as shown in fig. 8, in order to fix the armrest 72 in the laid-down position, first, the bolts are pulled out from the fixing holes 80b and the bolt fixing holes 78b, and the fixing of the armrest 72 is released. Then, the armrest 72 is laid down inward toward the upper surface of the fuel tank 24. When the armrest 72 is laid down, the bolt fixing hole 80b provided in the rotating plate 80 is aligned with the other of the 2 fixing holes 78b provided in the support plate 78. Therefore, the detached bolt is inserted through the bolt fixing hole 80b and the bolt fixing hole 78b, and the rotating plate 80 and the support plate 78 are fastened and fixed by screwing a nut into the bolt.

In the present embodiment, the rotating plate 80 is provided with 1 bolt fixing hole 80b and the support plate 78 is provided with 2 bolt fixing holes 78b, but the rotating plate 80 may be provided with 2 bolt fixing holes 80b and the support plate 78 may be provided with 1 bolt fixing hole 78 b.

If the armrest 72 is configured to be laid down to the outside, the upper end of the armrest 72 protrudes outside the revolving frame. In this case, the peripheral objects may be damaged by the turning operation. The armrest 72 according to the present embodiment is configured to be laid down inward toward the upper surface of the fuel tank 24, and therefore prevents damage to surrounding objects.

As shown in fig. 8, the armrest 72 is laid down in order to satisfy the height restriction when the excavator is transported by truck, and when the excavator is driven, the armrest 72 is fixed in a vertically erected state as shown in fig. 6 and 7. That is, in a state where the armrest 72(70) is fixed in a vertically erected state, as shown in fig. 1, the armrest 72(70) may become the uppermost part of the shovel, and the height limit may not be satisfied. Therefore, when the shovel is transported, the handrail 72(70) is prevented from exceeding the height limit by laying down the handrail 72 (70).

In the present embodiment, the armrest 72 is curved along 2 sides of the upper surface of the fuel tank 24, but need not necessarily be curved. For example, the horizontal portion 74a of the armrest pipe member 74 may be configured to extend linearly from one end of the armrest pipe member 74 in the front-rear direction of the excavator (a portion corresponding to the vertical portion 74b-1 in fig. 6 (disposed near the outer edge of the fuel tank 24)) toward the other end close to the work foot stand 34 (corresponding to the vertical portion 74b-2 in fig. 6).

Claims

1. A small-revolving type shovel having:

a fuel tank mounted on the upper slewing body;

a working oil tank disposed inside the fuel tank;

a reversible armrest fixed to an upper surface of the fuel tank;

an exhaust gas treatment device disposed behind the fuel tank; and

an exhaust stack for discharging the exhaust gas purified by the exhaust gas treatment device,

the armrest has an armrest pipe member having a horizontal portion and a vertical portion, and a pair of mounting portions rotatably supporting the armrest pipe member,

only one of the handrails is disposed between the exhaust funnel and the duct.

2. A small-revolving type shovel having:

a fuel tank mounted on the upper slewing body and provided with a fuel fill inlet;

a working oil tank disposed inside the fuel tank; and

a reversible armrest fixed at two positions of the upper surface of the fuel tank,

after the handrail member is rotated, the oil supply port is located outside the horizontal portion.

3. A small-revolving type shovel having:

a fuel tank mounted on the upper slewing body;

a working oil tank disposed inside the fuel tank; and

a reversible armrest fixed to an upper surface of the fuel tank,

the armrest has an armrest pipe member and a pair of mounting portions for rotatably supporting the armrest pipe member,

the pair of mounting portions each include a support pipe member having a cross section larger than a cross section of the handrail pipe member.

4. A gyratory excavator according to any one of claims 1 to 3, wherein,

the armrest is curved along a corner of an upper surface of the fuel tank.

5. The trolly-type shovel according to claim 1 or 2,

the armrest has an armrest pipe member that is bent and a pair of mounting portions that rotatably support the armrest pipe member,

6. A gyratory excavator according to any one of claims 1 to 3, wherein,

a pair of rotating plates are arranged on the handrail pipe component,

the pair of mounting portions are respectively provided with a support plate,

the rotating plates are rotatably supported by the support plates, respectively.

7. The trolly-type shovel according to claim 6,

one of the rotating plate and the support plate is provided with 1 bolt fixing hole, and the other of the rotating plate and the support plate is provided with 2 bolt fixing holes at equal distances from the rotating shaft of the rotating plate.