JP6873630B2 - Small excavator - Google Patents

Description

The present invention relates to a small excavator having an upper swivel body having a small swivel radius.

In recent years, construction machinery such as hydraulic excavators equipped with a diesel engine has installed an exhaust gas treatment device in the exhaust system of the diesel engine in order to comply with higher emission regulations. The exhaust gas from the diesel engine is released into the atmosphere through a NOx reduction catalyst provided on the downstream side of the exhaust pipe.

The above-mentioned exhaust gas treatment device is often a urea selective reduction type NOx treatment device that uses urea water as a liquid reducing agent. In the hydraulic excavator disclosed in Patent Document 1, urea water is stored in a urea water tank as a liquid reducing agent tank, and is injected into the exhaust path of a diesel engine by a pump.

Further, a so-called small swivel type excavator, which is configured to reduce the swivel radius ratio of the upper swivel body in order to work in a narrow space, is known.

The upper swivel body of the small swivel excavator is designed to have a compact structure in order to reduce the swivel radius ratio. Further, the liquid reducing agent tank needs to be installed in a place where the liquid reducing agent can be easily replenished. Therefore, it may be difficult to secure a space for installing the liquid reducing agent tank in the small swivel type excavator. In this regard, the hydraulic excavator disclosed in Patent Document 1 disperses and stores urea water in a plurality of small-capacity urea water tanks so that an empty space can be efficiently used.

Japanese Unexamined Patent Publication No. 2010-261373

However, in the hydraulic excavator disclosed in Patent Document 1, replenishment of urea water to each urea water tank may become complicated. This is because each urea water tank is basically replenished in a state where it is removed from the hydraulic excavator. Also, each urea water tank is not equipped with a level gauge. Therefore, if the operator replenishes the urea water while the urea water tank is attached to the body of the hydraulic excavator, the operator cannot confirm whether or not the urea water tank is filled, and the urea water may overflow. ..

In view of the above points, it is desirable to provide a small swivel excavator that allows the liquid reducing agent tank to be appropriately replenished with the liquid reducing agent tank attached to the airframe.

In order to achieve the above object, the small turning type excavator according to the embodiment of the present invention is arranged on the lower traveling body, the upper turning body rotatably mounted on the lower traveling body, and the upper turning body. A level gauge provided on the side surface of the fuel tank, the liquid reducing agent tank arranged at the right front portion of the upper swivel body and having a liquid supply port, and a position different from the liquid supply port. And a cover provided on the upper swing body for covering the liquid reducing agent tank, the cover has a first opening corresponding to the liquid supply port of the liquid reducing agent tank, and the liquid reducing agent. It has a second opening corresponding to the level gauge of the tank, the first opening and the second opening open in substantially the same direction, and the cover covers the right front portion of the upper swivel body. The first opening is formed in the right front cover, and the second opening includes the right front cover and the right front cover, which includes a right front cover for covering and a right side cover for covering the right side portion of the upper swing body. It is formed in the gap between the right side covers .

By the above-mentioned means, it is possible to provide a small swivel type excavator that allows the liquid reducing agent tank to be appropriately replenished with the liquid reducing agent while the liquid reducing agent tank is attached to the airframe.

It is a side view of the small swing type excavator according to the embodiment of this invention. It is a top view of the small swing type excavator shown in FIG. It is a top view which shows the inside of the upper swing body. It is a perspective view which shows the inside of the right front part of the upper swing body. It is a side view which shows the right front part of the upper swing body. It is a figure which shows an example of the relationship between the level gauge of a urea water tank, and a cover. It is a figure which shows another example of the relationship between the level gauge of a urea water tank, and a cover. It is a figure which shows still another example of the relationship between the level gauge of a urea water tank, and a cover.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a small swivel excavator according to an embodiment of the present invention. FIG. 2 is a plan view of the excavator shown in FIG. 1 as viewed from above. Hereinafter, in the present specification, the small excavator may be simply referred to as a "excavator". The upper swivel body 3 is rotatably mounted on the lower traveling body 1 of the excavator via the swivel mechanism 2. A boom 4 is attached to the upper swing body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 as an end attachment is attached to the tip of the arm 5. As the end attachment, a slope bucket, a dredging bucket, or the like may be used.

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

The upper swing body 3 is provided with a cabin 10, and a power source such as an engine 11 is mounted on the upper swing body 3. In the cabin 10, a driver's seat, various operating devices necessary for excavator operation, a controller for controlling the drive of the excavator, and the like are installed.

In the present specification, the front side (Z1 side) of the upper swing body 3 is the side to which the boom 4 is attached when viewed from the center of the upper swing body 3. The left side (X2 side) of the upper swivel body 3 is the side on which the cabin 10 is provided when viewed from the center of the upper swivel body 3 out of the two sides divided by the front-rear axis.

The boom 4 is rotatably supported by a boom support bracket 14 located substantially in the center of the upper swing body 3. Specifically, the boom 4 is supported by a boom foot pin 400 penetrating the right bracket 14R, the boom 4, and the left bracket 14L while being sandwiched between the right bracket 14R and the left bracket 14L.

The cabin 10 is installed on the front side (Z1 side) of the upper swing body 3 and on the left side (X2 side) of the boom 4. A cover 22 is attached to the front side (Z1 side) of the upper swing body 3 and to the right side (X1 side) of the boom 4. A fuel tank 24 and a hydraulic oil tank 26 are installed on the rear side (Z2 side) of the cover 22. In the example of FIG. 2, the fuel tank 24 is installed on the outside (X1 side), and the hydraulic oil tank 26 is installed on the inside (X2 side).

The upper surface of the cover 22 and the upper surface of the hydraulic oil tank 26 are used as passages for workers during maintenance and the like. On the other hand, the upper surface of the fuel tank 24 is located higher than the upper surface of the hydraulic oil tank 26 and is not used as a passage for workers.

A handrail 60 is attached to the outer peripheral portion of the upper swing body 3 from the cover 22 to the fuel tank 24. The operator uses the handrail 60 when climbing on the upper swing body 3. The handrail 60 extends to the fuel tank 24. From the position where the handrail 60 is terminated, the handrail 70 extends in the extension direction of the handrail 60. The handrail 70 is attached to the upper surface of the fuel tank 24 and is bent inward (X2 side) along the corner of the upper surface of the fuel tank 24. The handrail 70 is provided at a position where the operator can grasp it when the operator gets on the upper surface of the hydraulic oil tank 26.

An SCR cover 90 that covers the exhaust gas treatment device is provided on the rear side (Z2 side) of the fuel tank 24 and the hydraulic oil tank 26. An exhaust stack (muffler) 92 extending from the exhaust gas treatment device projects from a portion of the SCR cover 90 near the fuel tank 24.

The cover 22, the fuel tank 24, the hydraulic oil tank 26, the handrail 60, the handrail 70, and the SCR cover 90 are installed on the right side of the upper swing body 3.

As described above, the boom 4 is rotatably attached to the center of the upper swing body 3. The rear portion of the upper swivel body 3 has an arc shape. The radius of the arc is limited so that the turning radius of the excavator is equal to or less than a predetermined value. A counterweight 28 is attached to the center of the rear portion of the upper swing body 3. The engine 11 is installed in the space between the counterweight 28 and the boom 4. The upper part of the engine 11 is covered with the engine hood 30.

On the front side (Z1 side) of the engine hood 30, a passage 32 through which an operator passes when the engine hood 30 is opened and maintenance work of the engine 11 is performed is provided. On the front side of the passage 32, a work scaffold 34 is provided at a position lower than the passage 32. The work scaffold 34 is provided so as to cover the swivel motor arranged next to the hydraulic oil tank 26, and also functions as a swivel motor cover. When climbing the aisle 32, the worker first gets on the lower work scaffold 34 and then climbs the higher aisle 32. At this time, the operator can easily climb from the work scaffolding 34 to the passage 32 by touching the vertically extending portion of the handrail 70.

Next, the arrangement of each component in the upper swing body 3 will be described with reference to FIGS. 3 to 5. FIG. 3 is a plan view showing the inside of the upper swing body 3. In FIG. 3, covers such as the cover 22, the SCR cover 90, and the engine hood 30 are all removed. FIG. 4 is a perspective view of the upper swivel body 3 when the right front portion of the upper swivel body 3 is viewed from a position diagonally forward to the right. In FIG. 4, the cover 22 is removed. FIG. 5 is a side view of the upper swivel body 3 when the right front portion of the upper swivel body 3 is viewed from the right side position. The broken line (hidden line) in FIG. 5 transparently shows the internal components covered with the cover 22 and the like.

As shown in FIG. 3, a urea water tank 36 as a liquid reducing agent tank is installed on the swivel frame 300 forming the bottom of the upper swivel body 3. A control valve 37, a fuel tank 24, and a hydraulic oil tank 26 are installed on the rear side (Z2 side) of the urea water tank 36. As shown in FIG. 5, the swivel frame 300 is composed of a bottom plate 300a and a beam portion 300b installed on the bottom plate 300a. The urea water tank 36 and the control valve 37 are installed on the bottom plate 300a. The bottom plate 300a has a thickness of about 25 mm.

As shown in FIG. 4, the urea water tank 36 has a front surface, an upper surface, and a rear surface partially covered with a tank casing portion 100. A level gauge 36G is provided on the right front portion of the urea water tank 36. The level gauge 36G is a gauge indicating the level of urea water in the urea water tank 36. In the example of FIG. 4, the level gauge 36G is configured so that the liquid level when the urea water is replenished to the maximum permissible amount can be seen.

A urea water pump 38 as a liquid reducing agent supply pump is attached to the tank casing portion 100. A urea water pipe 39 as a liquid reducing agent supply pipe is connected to the urea water pump 38. As shown in FIG. 3, the urea water pipe 39 is installed between the right bracket 14R and the hydraulic oil tank 26 and is connected to the exhaust gas treatment device 50. With this configuration, the urea water in the urea water tank 36 is supplied to the exhaust gas treatment device 50 to treat the exhaust gas of the engine 11.

The engine 11 is installed in the center of the rear part of the upper swing body 3. An engine cooler 40 and an intercooler 42 are installed on the left side (X2 side) of the engine 11 on which the fan of the engine 11 is provided. An air filter 44 for filtering the air supplied to the engine 11 is installed on the outer side (X2 side) of the intercooler 42. As described above, various devices attached to the engine 11 are installed on the left side (X2 side) of the engine 11. Therefore, it is difficult to secure a space for arranging a large device such as the exhaust gas treatment device 50.

Therefore, in the present embodiment, the exhaust gas treatment device 50 is installed above the pump chamber (not shown) on the right side (X1 side) of the engine 11. However, since the exhaust gas treatment device 50 is a relatively large device, it is installed obliquely so that its longitudinal axis is inclined with respect to the front-rear axis of the upper swing body 3. By installing the exhaust gas treatment device 50 at an angle in this way, the entire exhaust gas treatment device 50 can be accommodated within the turning radius of the upper swivel body 3 above the pump chamber.

Further, by arranging the exhaust gas treatment device 50 above the pump chamber, the exhaust gas treatment device 50 can be installed at a position relatively low with respect to the engine 11. Therefore, the height of the exhaust stack (muffler) 92 extending upward from the exhaust gas treatment device 50 can be lowered.

Here, the exhaust gas treatment device 50 will be briefly described. In the present embodiment, since the diesel engine is used as the engine 11, it is necessary to provide the exhaust gas treatment device 50 in order to clear the exhaust gas regulations. The exhaust gas treatment device 50 is installed in the exhaust system of the engine 11 and processes the exhaust gas of the engine 11 to convert it into an exhaust gas that clears the exhaust gas regulations. The exhaust gas purified in this way is released into the atmosphere from the exhaust gas cylinder (muffler) 92 of the exhaust gas treatment device 50.

Next, the specific configuration and arrangement of the urea water tank 36, the control valve 37, etc. installed on the right side (X1 side) and the front side (Z1 side) of the upper swing body 3 will be described.

The control valve 37 is installed inside the cover frame portion 80 that supports the cover 22. As shown in FIG. 4, the cover frame portion 80 has two vertical frames 81 on the front side (Z1 side) rising from the bottom plate 300a and two vertical frames 82 on the rear side (Z2 side). .. The vertical frame 81 is formed so that its height is lower than the height of the vertical frame 82, and the vertical frame 81 and the vertical frame 82 are connected by a connecting frame 83 extending diagonally. The pair of left and right connecting frames 83 are connected by a horizontal frame 84. Further, the pair of left and right vertical frames 82 are connected by a horizontal frame 85. A control valve 37 is installed inside the cover frame portion 80.

As shown in FIG. 3, the urea water tank 36 is installed in the region S on the front side (Z1 side) of the cover frame portion 80. The area S is an area (space) previously used as a tool box. Therefore, it is not necessary to change the outer shape of the upper swing body 3 when installing the urea water tank 36 in the region S. The turning radius of the upper swivel body 3 does not increase. Further, the operator can easily perform the urea water replenishment work with the urea water tank 36 installed in the area S. This is because the urea water tank 36 is installed at an easily accessible position on the right front portion of the upper swing body 3. Specifically, the operator can replenish the urea water tank 36 with urea water simply by climbing on the lower traveling body 1.

The urea water tank 36 may have a volume expansion portion 361. The volume expansion portion 361 is a bulge for expanding the volume of the urea water tank 36. There is no limitation on the number, shape, size, etc. of the volume expanding portion 361, and it is appropriately determined according to the situation.

A cylindrical filler 362 for replenishing urea water is provided at the liquid supply port of the urea water tank 36. In the example of FIG. 4, the liquid supply port of the filler 362 is provided so as to face diagonally upward toward the front side (Z1 side).

The liquid supply port of the filler 362 is located higher than the liquid supply port of the urea water tank 36. Therefore, the urea water can be replenished until the urea water tank 36 is completely filled with the urea water. Further, even if the urea water tank 36 is tilted, the cylindrical portion of the filler 362 can prevent the urea water from splashing out from the liquid supply port of the filler 362. The cylindrical portion of the filler 362 may extend linearly upwards, may be curved as shown in FIG. 5, or may be bent. In the case of bending or bending, it is possible to more effectively prevent the urea water from splashing out from the liquid supply port of the filler 362. Further, a lid 363 is provided at the liquid supply port of the filler 362. Further, the cylindrical portion of the filler 362 is protected by a square tubular protective material 362a. The protective material 362a may have another shape such as a cylindrical shape. The protective material 362a may be omitted.

The urea water tank 36 is housed in the tank casing portion 100. The tank casing portion 100 is composed of two vertical plates 101 and an upper surface plate 102. The vertical plate 101 extends along the front surface (Z1 side surface) and the rear surface (Z2 side surface) of the urea water tank 36, respectively. The top plate 102 connects the upper edges of the two vertical plates 101 and covers the top surface of the urea water tank 36. The vertical plate 101 extending along the rear surface (the surface on the Z2 side) is invisible in FIG. In the example of FIG. 4, the vertical plate 101 has an opening at the center thereof. However, the opening may be omitted.

The top plate 102 has an opening through which a cylindrical filler 362 can be inserted. Further, a support bracket 103 for fixing the urea water pump 38 is connected to the rear side (Z2 side) of the upper surface plate 102. The urea water pump 38 is fixed to the support bracket 103. For the sake of clarification, the tank casing 100 and the urea water pump 38 are not shown in FIG.

The urea water pipe 39 located in the vicinity of the urea water pump 38 is installed along the horizontal frame 84 and the vertical frame 81 located on the front side (Z1 side) of the cover frame portion 80.

Further, as shown in FIG. 5, the urea water tank 36 is mounted on the bottom plate 300a of the swivel frame 300 so that the bottom surface thereof is lower than the bottom surface of the fuel tank 24. This is to make the height of the urea water tank 36 housed under the cover 22 as high as possible.

The fuel tank 24 is installed so that its bottom surface is located on the two beam portions 300b constituting the swivel frame 300. A hydraulic pipe or the like (not shown) may be inserted into the region H raised by the beam portion 300b.

Next, with reference to FIG. 5, the cover 22 that covers the right front portion of the upper swing body 3 will be described. In the example of FIG. 5, the cover 22 includes a right front cover 22F that covers the upper surface and the front surface of the right front portion of the upper swivel body 3, and a right side cover 22R that covers the right side surface of the right side portion of the upper swivel body 3. In the example of FIG. 5, the right side cover 22R is configured to be openable / closable (rotatable) and lockable around the shaft 22RX indicated by the alternate long and short dash line. The figure shown by the dot hatching in FIG. 5 is a seal member 22RP attached to the inside of the right side cover 22R. The seal member 22RP seals the inside of the right front portion of the upper swing body 3 when the right side cover 22R is closed. However, the right side cover 22R may be configured so as not to be opened / closed (rotated), or may be integrally configured with the right front cover 22F.

The right front cover 22F also has a function as a passage for the operator to move up and down. The right front cover 22F is formed with a plurality of elevating steps 220, 221 and 222 so that the side cross-sectional shape is a staircase shape on the outer peripheral surface thereof. Anti-slip 220a, 221a, and 222a are attached to the upper surfaces of the elevating steps 220, 221 and 222, respectively. An elevating step 300c is attached to the front end on the right side of the swivel frame 300. A vertical frame of the handrail 60 is connected to the upper surface of the elevating step 300c, the upper surface of the right front cover 22F, and the upper surface of the fuel tank 24. In this way, the right front cover 22F functions as a cover that covers the upper parts of the urea water tank 36, the control valve 37, and the like, and also functions as a passage for the operator to move up and down.

A door 223 that can be opened and closed is attached to the front side (Z1 side) of the right front cover 22F. The door 223 is attached so as to open laterally at a position facing the lid 363 of the filler 362 of the urea water tank 36. The lid 363 is exposed to the outside when the door 223 is opened. The operator can replenish the urea water tank 36 with urea water by opening the door 223 and removing the lid 363.

The operator, for example, takes the replenishment urea water container 36X and climbs on the lower traveling body 1. The replenishment urea water container 36X is a portable container for accommodating the replenishment urea water, and is composed of, for example, a polyethylene inner bag and a corrugated cardboard outer bag. Then, the operator puts the replenishment urea water container 36X on the elevating step 220, and inserts the nozzle of the replenishment urea water container 36X into the liquid supply port of the filler 362. Then, the operator can replenish the urea water from the replenishment urea water container 36X to the urea water tank 36 by tilting the replenishment urea water container 36X. At this time, the operator can easily confirm whether or not the urea water has been replenished to the maximum allowable amount by visually observing the level gauge 36G.

The door 223 may be keyed. This is to prevent unauthorized access to the lid 363. In this case, it is not necessary to attach the key to the lid 363. This is because the key attached to the door 223 can prevent unauthorized access to the lid 363.

A headlight cover 220b for accommodating the headlights is formed below the elevating step 220. A louver is attached to the front surface (Z1 side surface) of the headlight cover 220b. The headlight illuminates the front of the upper swivel body 3 through this louver.

Next, with reference to FIG. 6, an example of the relationship between the level gauge 36G of the urea water tank 36 and the cover 22 will be described. FIG. 6 is a perspective view of the upper swivel body 3 when the right front portion of the upper swivel body 3 is viewed from a position diagonally forward to the right.

The cover 22 has a first opening OP1 and a second opening OP2. The first opening OP1 is formed at a position corresponding to the liquid supply port of the urea water tank 36. The position corresponding to the liquid supply port of the urea water tank 36 is, for example, the position corresponding to the liquid supply port of the filler 362. The second opening OP2 is formed at a position corresponding to the level gauge 36G of the urea water tank 36.

The first opening OP1 is formed, for example, on the front surface (Z1 side surface) of the right front cover 22F at a position higher than the elevating step 220. The first opening OP1 is open toward the front. Strictly speaking, it opens diagonally upward. This is to allow the operator to easily see the lid 363 of the filler 362 and the liquid supply port thereof when replenishing the urea water. In the example of FIG. 6, a door 223 that can be opened and closed is attached to the first opening OP1. The door 223 is attached so as to open laterally at a position facing the lid 363 of the filler 362 of the urea water tank 36. The arrows in the figure indicate the opening direction of the door 223. The lid 363 is exposed to the outside when the door 223 is opened.

The second opening OP2 is formed, for example, as a recess on the right side edge of the right front cover 22F. That is, the second opening OP2 is formed in the gap between the right front cover 22F and the right side cover 22R. In the example of FIG. 6, a door knob (door handle) 224 for opening and closing is attached to the right side cover 22R. The broken line (hidden line) in FIG. 6 indicates the edge of the right side surface of the right front cover 22F. The portion extending in the vertical direction (Y-axis direction) of the edge portion of the right side surface of the right front cover 22F is configured to be recessed toward the front side at the level gauge 36G to form the second opening OP2. Therefore, the level gauge 36G of the urea water tank 36 is exposed through the second opening OP2 even when the right side cover 22R is closed. The operator can visually recognize the level gauge 36G of the urea water tank 36 through the second opening OP2 even when the right side cover 22R is closed. That is, the level gauge 36G can be visually recognized without opening and closing the right side cover 22R.

When replenishing the urea water tank 36 with urea water, the operator climbs on the lower traveling body 1 by holding, for example, the replenishment urea water container 36X. Then, the operator puts the replenishment urea water container 36X on the elevating step 220, opens the door 223, and removes the lid 363 of the filler 362. After that, the operator inserts the nozzle of the replenishment urea water container 36X into the liquid supply port of the filler 362. In this state, the operator can replenish the urea water from the replenishment urea water container 36X to the urea water tank 36 by tilting the replenishment urea water container 36X. At this time, the operator can easily confirm whether or not the urea water has been replenished to the maximum allowable amount by visually observing the level gauge 36G from diagonally above through the second opening OP2. Therefore, the operator can prevent the urea water from overflowing from the urea water tank 36 when the urea water is replenished.

The second opening OP2 may be formed as a recess at the front end of the right front cover 22R instead of being formed as a recess at the edge of the right side of the right front cover 22F. FIG. 7 shows an example in which the second opening OP2 is formed as a recess in the front end portion of the right side cover 22R. Even in this configuration, the operator can visually recognize the level gauge 36G of the urea water tank 36 through the second opening OP2 even when the right side cover 22R is closed.

In the example of FIG. 6, the second opening OP2 is formed in a portion extending in the vertical direction (Y-axis direction) of the edge portion of the right side surface of the right front cover 22F. That is, the second opening OP2 opens forward, but does not open upward. This has the effect of suppressing the invasion of rainwater, earth and sand, etc. into the inside of the right front portion of the upper swing body 3. However, the second opening OP2 may be formed, at least in part, at a portion of the edge of the right side surface of the right front cover 22F that extends diagonally. That is, the second opening OP2 may be opened upward, at least in part. In this case, the first opening OP1 and the second opening OP2 may be opened in substantially the same direction. The operator can visually recognize the level gauge 36G from above with the right side cover 22R closed. Further, the operator can visually recognize the liquid supply port of the filler 362 and the level gauge 36G at substantially the same line-of-sight angle. The same applies to the case where the second opening OP2 is formed as a recess at the end of the right side cover 22R.

In the example of FIG. 6, the second opening OP2 is formed in the gap between the right front cover 22F and the right side cover 22R, but may be formed as a through hole penetrating the right side cover 22R. For example, when the right front cover 22F and the right side cover 22R are integrally formed, both the first opening OP1 and the second opening OP2 may be formed as through holes penetrating the cover 22.

Next, with reference to FIG. 8, another example of the relationship between the level gauge 36G of the urea water tank 36 and the cover 22 will be described. FIG. 8 is a perspective view of the upper swivel body 3 when the right front portion of the upper swivel body 3 is viewed from a position diagonally forward to the right, and corresponds to FIGS. 6 and 7.

The cover 22 of FIG. 8 differs from the cover 22 of FIG. 6 in that it has a second opening OP2 as a through hole on the front surface (the surface on the Z1 side) of the right front cover 22F, but is common in other respects. Therefore, the description of the common part will be omitted, and the difference part will be described in detail.

The broken line (hidden line) in FIG. 8 indicates the edge of the right side surface of the right front cover 22F as in the case of FIG. In the example of FIG. 8, a gap is not formed between the right front cover 22F and the right side cover 22R so that the level gauge 36G can be visually recognized. This is because the level gauge 36G of the urea water tank 36 is provided on the left front portion of the urea water tank 36.

Therefore, in the example of FIG. 8, the second opening OP2 is on the front surface (Z1 side surface) of the right front cover 22F so as to correspond to the position of the level gauge 36G provided on the left front portion of the urea water tank 36. It is formed as a through hole on the left side of the headlight cover 220b.

With this configuration, the cover 22 of FIG. 8 can realize the same effect as the cover 22 shown in FIGS. 6 and 7.

From the above, in the small swivel type excavator according to the embodiment of the present invention, the urea water tank 36 is appropriately replenished with urea water in a state where the urea water tank 36 is attached to the airframe. Specifically, in the small swirl type excavator according to the embodiment of the present invention, the cover 22 corresponds to the first opening OP1 corresponding to the liquid supply port of the urea water tank 36 and the level gauge 36G of the urea water tank 36. It has a second opening OP2 to be formed. Therefore, maintainability can be improved. This is because the operator can easily check the remaining amount of the urea water tank 36 from the outside. Further, the worker who replenishes the urea water tank 36 with the urea water visually recognizes the level gauge 36G from diagonally above through the second opening OP2 at the time of replenishing the urea water to determine whether or not the urea water has been replenished to the maximum allowable amount. Can be easily confirmed. Therefore, the operator can prevent the urea water from overflowing from the urea water tank 36 when the urea water is replenished.

The cover 22 may be composed of a right front cover 22F that covers the right front portion of the upper swivel body 3 and a right side cover 22R that covers the right side portion of the upper swivel body 3. In this case, the first opening OP1 is formed in the right front cover 22F, and the second opening OP2 is formed in the gap between the right front cover 22F and the right side cover 22R. In this configuration, the level gauge 36G of the urea water tank 36 is exposed through the second opening OP2 even when the right side cover 22R is closed. Therefore, the operator can visually recognize the level gauge 36G of the urea water tank 36 through the second opening OP2 even when the right side cover 22R is closed. That is, the level gauge 36G can be visually recognized without opening and closing the right side cover 22R.

Further, both the first opening OP1 and the second opening OP2 may be formed on the right front cover 22F. In this case, the right front cover 22F and the right side cover 22R may be integrally formed. Also in this configuration, the level gauge 36G of the urea water tank 36 is exposed through the second opening OP2. Therefore, the operator can visually recognize the level gauge 36G of the urea water tank 36 through the second opening OP2.

Further, a door 223 with a key may be attached to the first opening OP1. With this configuration, the small swivel excavator can prevent unauthorized access to the lid 363 of the filler 362. Also, the lid 363 does not have to be lockable. This is because the door 223 can be locked to prevent unauthorized access to the lid 363.

Further, the first opening OP1 and the second opening OP2 may be opened in substantially the same direction. With this configuration, the operator can visually recognize the liquid supply port of the filler 362 and the level gauge 36G at substantially the same line-of-sight angle. Therefore, the operator can more reliably prevent the urea water from overflowing from the urea water tank 36 when the urea water is replenished.

Further, the elevating step 220 may be attached to the right front cover 22F below the first opening OP1. More preferably, the elevating step 220 may be attached at a position higher than the upper surface of the urea water tank 36. With this configuration, the operator can insert the nozzle of the replenishment urea water container 36X into the liquid supply port of the filler 362 while the replenishment urea water container 36X is placed on the elevating step 220. Then, the operator can replenish the urea water from the replenishment urea water container 36X to the urea water tank 36 by tilting the replenishment urea water container 36X. At this time, the operator can easily confirm whether or not the urea water has been replenished to the maximum allowable amount by visually observing the level gauge 36G.

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiment. The above-described embodiment can be modified in various ways within the scope of the present invention described in the claims.

For example, in the above embodiment, the second opening OP2 is configured to expose the entire level gauge 36G. This is so that the operator can confirm whether or not the urea water has been replenished to the maximum allowable amount when replenishing the urea water. Further, the operator can easily check the remaining amount of urea water from the outside. However, the present invention is not limited to this configuration. For example, the second opening OP2 may be configured to expose the upper half of the level gauge 36G. This is because if the upper half is exposed, the operator can confirm whether or not the urea water has been replenished to the maximum allowable amount. Further, the smaller the opening area of the second opening OP2, the more the invasion of rainwater, earth and sand, etc. into the inside is further suppressed.

1 ... Lower traveling body 2 ... Swivel mechanism 3 ... Upper swivel body 4 ... Boom 5 ... Arm 6 ... Bucket 7 ... Boom cylinder 8 ... Arm cylinder 9 ...・ Bucket cylinder 10 ・ ・ ・ Cabin 11 ・ ・ ・ Engine 14 ・ ・ ・ Boom support bracket 14L ・ ・ ・ Left side bracket 14R ・ ・ ・ Right side bracket 22 ・ ・ ・ Cover 22F ・ ・ ・ Right front cover 22R ・ ・ ・ Right side Cover 22RP ・ ・ ・ Seal member 22RX ・ ・ ・ Shaft 24 ・ ・ ・ Fuel tank 26 ・ ・ ・ Hydraulic oil tank 28 ・ ・ ・ Counter weight 30 ・ ・ ・ Engine hood 32 ・ ・ ・ Passage 34 ・ ・ ・ Work scaffold 36・ ・ ・ Urea water tank 36G ・ ・ ・ Level gauge 36X ・ ・ ・ Replenishment urea water container 37 ・ ・ ・ Control valve 38 ・ ・ ・ Urea water pump 39 ・ ・ ・ Urea water pipe 40 ・ ・ ・ Engine cooler 42・ ・ ・ Intercooler 44 ・ ・ ・ Air filter 50 ・ ・ ・ Exhaust gas treatment device 60, 70 ・ ・ ・ Handrail 80 ・ ・ ・ Cover frame part 81, 82 ・ ・ ・ Vertical frame 83 ・ ・ ・ Connecting frame 84, 85 ・・ ・ Horizontal frame 90 ・ ・ ・ SCR cover 92 ・ ・ ・ Exhaust cylinder (muffler) 100 ・ ・ ・ Tank casing 101 ・ ・ ・ Vertical plate 102 ・ ・ ・ Top plate 103 ・ ・ ・ Support bracket 220, 222, 222 , 300c ... Lifting step 220a, 221a, 222a ... Non-slip 220b ... Headlight cover 223 ... Door 224 ... Door knob 300 ... Swivel frame 300a ... Bottom plate 300b ... Beam part 361 ・ ・ ・ Volume expansion part 362 ・ ・ ・ Filler 362a ・ ・ ・ Protective material 363 ・ ・ ・ Lid 400 ・ ・ ・ Boom foot pin H, S ・ ・ ・ Area OP1 ・ ・ ・ First opening OP2 ・ ・ ・・ Second opening

Claims (3)

With the lower running body,
An upper swivel body that is mounted on the lower traveling body so as to be swivel
The fuel tank arranged on the upper swing body and
A liquid reducing agent tank arranged at the right front part of the upper swivel body and having a liquid supply port, and
A level gauge provided on the side surface of the liquid reducing agent tank, which is located at a position different from the liquid supply port,
A cover provided on the upper swivel body for covering the liquid reducing agent tank is provided.
The cover has a first opening corresponding to the liquid supply port of the liquid reducing agent tank and a second opening corresponding to the level gauge of the liquid reducing agent tank.
The first opening and the second opening are opened in substantially the same direction, and the first opening and the second opening are opened in substantially the same direction .
The cover includes a right front cover that covers the right front portion of the upper swivel body and a right side cover that covers the right side portion of the upper swivel body.
The first opening is formed in the right front cover.
The second opening is formed in the gap between the right front cover and the right side cover .
Small excavator. A door with a key is attached to the first opening.
The small excavator according to claim 1. A step is attached to the right front cover below the first opening.
The small excavator according to claim 1 or 2.

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