JP2018035741A - Small revolving type shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small revolving type shovel which is configured so that liquid reductant is properly re-supplied to a liquid reductant tank in the state that the liquid reductant tank is mounted on a machine body.SOLUTION: The small revolving type shovel includes an undercarriage, a revolving super structure mounted on the undercarriage in a revolvable manner, a urea water tank arranged on the right front of the revolving super structure, and a cover 22 provided on the revolving super structure for covering the urea water tank, the cover 22 having a first opening OP1 corresponding to a liquid supply port of the urea water tank, and a second opening OP2 corresponding to a level gage 36G of the urea water tank.SELECTED DRAWING: Figure 6

Description

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

  In recent years, construction machinery such as a hydraulic excavator 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-order exhaust gas regulations. 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-described exhaust gas treatment apparatus is often a urea selective reduction type NOx treatment apparatus 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 an exhaust path of a diesel engine by a pump.

  Also, a so-called small swivel excavator is known that is configured so that the turning radius ratio of the upper turning body is small in order to work in a narrow space.

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

JP 2010-261373 A

  However, in the hydraulic excavator disclosed in Patent Document 1, it is likely that the urea water supply to each urea water tank becomes complicated. This is because each urea water tank is basically replenished while being removed from the excavator. Further, each urea water tank does not have a level gauge. Therefore, if the urea water tank is replenished in a state where the urea water tank is attached to the body of the hydraulic excavator, the operator cannot check whether the urea water tank is filled, and may overflow the urea water. .

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

  In order to achieve the above-described object, a small turning excavator according to an embodiment of the present invention includes a lower traveling body, an upper swinging body that is turnably mounted on the lower traveling body, and a right front portion of the upper swinging body. A liquid reducing agent tank to be disposed; and a cover provided on the upper revolving unit and covering the liquid reducing agent tank, wherein the cover corresponds to a liquid supply port of the liquid reducing agent tank. And a second opening corresponding to the level gauge of the liquid reducing agent tank.

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

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

  Embodiments 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 this specification, the small turning excavator may be simply referred to as “excavator”. An upper swing body 3 is mounted on the lower traveling body 1 of the excavator via a swing mechanism 2 so as to be capable of swinging. 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 an end attachment, a slope bucket, a kite bucket, or the like may be used.

  The boom 4, the arm 5, and the bucket 6 constitute a drilling 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. Inside the cabin 10 are installed a driver's seat, various operation devices necessary for excavator operation, a controller for controlling the drive of the excavator, and the like.

  In this specification, the front side (Z1 side) of the upper swing body 3 is the side on which the boom 4 is attached as viewed from the center of the upper swing body 3. The left side (X2 side) of the upper swing body 3 is the side where the cabin 10 is provided when viewed from the center of the upper swing body 3 among the two sides divided by the longitudinal axis.

  The boom 4 is rotatably supported by a boom support bracket 14 at the approximate 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 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 a worker's passage during maintenance. 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 worker's passage.

  A handrail 60 is attached to the outer periphery 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 ends, the handrail 70 extends in the extending direction of the handrail 60. The handrail 70 is attached to the upper surface of the fuel tank 24 and is bent toward the inside (X2 side) along the corner of the upper surface of the fuel tank 24. The handrail 70 is provided at such a position that the operator can grip it when the operator gets on the upper surface of the hydraulic oil tank 26.

  On the rear side (Z2 side) of the fuel tank 24 and the hydraulic oil tank 26, an SCR cover 90 that covers the exhaust gas treatment device is provided. An exhaust pipe (muffler) 92 extending from the exhaust gas treatment device projects from a portion of the SCR cover 90 close to the fuel tank 24.

  The cover 22, the fuel tank 24, the hydraulic oil tank 26, the hand rail 60, the hand rail 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 part of the upper swing body 3 has an arc shape. The radius of the circular arc is limited so that the turning radius of the shovel is not more than a predetermined value. A counterweight 28 is attached to the center of the rear part 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 an 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 (Z1 side) of the engine hood 30. On the front side of the passage 32, a working scaffold 34 is provided at a position lower than the passage 32. The work scaffold 34 is provided so as to cover a turning motor disposed beside the hydraulic oil tank 26, and also functions as a turning motor cover. When the worker climbs the passage 32, he first gets on the lower working scaffold 34 and then climbs the higher passage 32. At this time, the operator can easily climb from the work scaffold 34 to the passage 32 by placing a hand on the portion of the handrail 70 that extends in the vertical direction.

  Next, with reference to FIGS. 3 to 5, the arrangement of each component in the upper swing body 3 will be described. FIG. 3 is a plan view showing the inside of the upper swing body 3. In FIG. 3, the 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 swing body 3 when the right front portion of the upper swing body 3 is viewed from a position diagonally forward to the right. In FIG. 4, the cover 22 has been removed. FIG. 5 is a side view of the upper swing body 3 when the right front portion of the upper swing body 3 is viewed from the right position. The broken line (hidden line) in FIG. 5 shows the internal components covered with the cover 22 or the like in a perspective view.

  As shown in FIG. 3, a urea water tank 36 serving as a liquid reducing agent tank is installed on a revolving frame 300 that forms the bottom of the upper revolving structure 3. On the rear side (Z2 side) of the urea water tank 36, a control valve 37, a fuel tank 24, and a hydraulic oil tank 26 are installed. As shown in FIG. 5, the swivel frame 300 includes 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 front, upper, and rear surfaces of the urea water tank 36 are partially covered with a tank casing portion 100. A level gauge 36 </ b> G is provided at the right front portion of the urea water tank 36. The level gauge 36G is a gauge indicating the level of the urea water in the urea water tank 36. In the example of FIG. 4, the level gauge 36 </ b> G is configured so that the liquid level when the urea water is replenished to the maximum allowable amount can be seen.

  A urea water pump 38 as a liquid reducing agent supply pump is attached to the tank casing unit 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 14 </ b> R and the hydraulic oil tank 26 and 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 and the exhaust gas of the engine 11 is treated.

  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 the side where 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 further outer side (X2 side) of the intercooler 42. Thus, 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 a 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, the exhaust gas treatment device 50 is installed obliquely so that its longitudinal axis is inclined with respect to the longitudinal axis of the upper swing body 3. In this way, by installing the exhaust gas treatment device 50 obliquely, the entire exhaust gas treatment device 50 can be accommodated within the turning radius of the upper swing body 3 above the pump chamber.

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

  Here, the exhaust gas treatment device 50 will be briefly described. In this 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 converts the exhaust gas of the engine 11 into exhaust gas that has cleared the exhaust gas regulations. The exhaust gas thus purified is discharged from the exhaust pipe (muffler) 92 of the exhaust gas treatment device 50 to the atmosphere.

  Next, specific configurations and arrangements of the urea water tank 36, the control valve 37, and the like 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 such 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 that extends obliquely. The pair of left and right connecting frames 83 are connected by a horizontal frame 84. 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 a region S on the front side (Z1 side) of the cover frame portion 80. The area S is an area (space) that has been used as a tool box in the past. Therefore, when the urea water tank 36 is installed in the region S, it is not necessary to change the outer shape of the upper swing body 3. The turning radius of the upper swing body 3 does not increase. In addition, the worker can easily perform the urea water replenishment work in a state where the urea water tank 36 is installed in the region 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 worker can replenish urea water in the urea water tank 36 only by climbing on the lower traveling body 1.

  The urea water tank 36 may have a volume expanding part 361. The volume expanding unit 361 is a bulge for expanding the volume of the urea water tank 36. There are no restrictions on the number, shape, size, and the like of the volume expansion unit 361, and the volume expansion unit 361 is appropriately determined according to circumstances.

  A cylindrical filler 362 for supplying 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 obliquely 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, urea water can be replenished until the urea water tank 36 is completely filled with urea water. Even if the urea water tank 36 is inclined, it is possible to prevent the urea water from splashing out from the liquid supply port of the filler 362 by the cylindrical portion of the filler 362. The cylindrical portion of the filler 362 may extend linearly upward, may be curved as shown in FIG. 5, or may be bent. In the case of bending or bending, urea water can be more effectively prevented from jumping out from the liquid supply port of the filler 362. 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 tube-shaped 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 accommodated in the tank casing portion 100. The tank casing unit 100 includes two vertical plates 101 and a top plate 102. The vertical plate 101 extends along each of the front surface (Z1 side surface) and the rear surface (Z2 side surface) of the urea water tank 36. The upper surface plate 102 connects the upper edges of the two vertical plates 101 and covers the upper surface of the urea water tank 36. The vertical plate 101 extending along the rear surface (the surface on the Z2 side) is not visible 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. A support bracket 103 for fixing the urea water pump 38 is connected to the rear side (Z2 side) of the top plate 102. The urea water pump 38 is fixed to the support bracket 103. For clarity of illustration, 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.

  As shown in FIG. 5, the urea water tank 36 is mounted on the bottom plate 300 a of the turning 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 stored under the cover 22 as high as possible.

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

  Next, the cover 22 that covers the right front portion of the upper swing body 3 will be described with reference to FIG. In the example of FIG. 5, the cover 22 includes a right front cover 22 </ b> F that covers the upper surface and the front surface of the right front portion of the upper swing body 3, and a right side cover 22 </ b> R that covers the right side surface of the right side portion of the upper swing body 3. In the example of FIG. 5, the right side cover 22R is configured to be openable / closable (rotatable) and lockable around an axis 22RX indicated by a one-dot chain line. The figure shown by dot hatching in FIG. 5 is a seal member 22RP attached to the inner side 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 and closed (turned), or may be configured integrally with the right front cover 22F.

  The right front cover 22F also has a function as a passage through which an operator moves up and down. The right front cover 22F has a plurality of lifting steps 220, 221, and 222 formed on the outer peripheral surface thereof so that the side cross-sectional shape is a stepped shape. Anti-skids 220a, 221a, and 222a are attached to the upper surfaces of the elevating steps 220, 221, and 222, respectively. A lifting step 300 c is attached to the right front end 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. As described above, the right front cover 22F functions as a cover that covers the upper portions of the urea water tank 36, the control valve 37, and the like, and also functions as a passage through which the operator moves up and down.

  An openable / closable door 223 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.

  For example, the worker climbs onto the lower traveling body 1 with the replenishing urea water container 36X. The replenishment urea water container 36X is a portable container for storing replenishment urea water, and is composed of, for example, a polyethylene inner bag and a cardboard outer bag. Then, the worker places the replenishment urea water container 36 </ b> X on the elevation step 220 and inserts the nozzle of the replenishment urea water container 36 </ b> X into the liquid supply port of the filler 362. The operator can replenish 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 recognizing 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 a 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 housing the headlamp is formed below the lifting step 220. A louver is attached to the front surface (the surface on the Z1 side) of the headlamp cover 220b. The headlamp illuminates the front of the upper swing body 3 through this louver.

  Next, an example of the relationship between the level gauge 36G of the urea water tank 36 and the cover 22 will be described with reference to FIG. FIG. 6 is a perspective view of the upper swing body 3 when the right front portion of the upper swing 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 OP <b> 1 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 a position corresponding to the liquid supply port of the filler 362, for example. The second opening OP2 is formed at a position corresponding to the level gauge 36G of the urea water tank 36.

  For example, the first opening OP1 is formed at a position higher than the elevation step 220 on the front surface (the surface on the Z1 side) of the right front cover 22F. The first opening OP1 is open toward the front. Strictly speaking, the opening is directed obliquely upward. This is because an operator can easily see the lid 363 of the filler 362 and its liquid supply port when supplying 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 at the edge of the right side surface 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. A portion extending in the vertical direction (Y-axis direction) of the right side edge of the right front cover 22F is configured to be recessed toward the front side at the level gauge 36G to form a 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. 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. That is, the level gauge 36G can be visually recognized without opening and closing the right side cover 22R.

  When the urea water tank 36 is replenished with urea water, the worker climbs onto the lower traveling body 1 with the replenishing urea water container 36X, for example. Then, the operator places the replenishment urea water container 36X on the lifting step 220, opens the door 223, and removes the lid 363 of the filler 362. Thereafter, the operator inserts the nozzle of the replenishment urea water container 36 </ b> X into the liquid supply port of the filler 362. In this state, the operator can replenish 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 up to the allowable maximum amount by visually recognizing the level gauge 36G 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 side cover 22R instead of being formed as a recess at the right side edge of the right front cover 22F. FIG. 7 shows an example in which the second opening OP2 is formed as a recess at the front end 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) in 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 that rainwater, earth and sand, etc. can be prevented from entering the right front part of the upper swing body 3. However, the second opening OP2 may be formed at least partially in a portion extending obliquely in the edge of the right side surface of the right front cover 22F. That is, the second opening OP2 may be opened upward at least partially. In this case, the first opening OP1 and the second opening OP2 may open 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 that penetrates 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 that penetrate the cover 22.

  Next, another example of the relationship between the level gauge 36G of the urea water tank 36 and the cover 22 will be described with reference to FIG. FIG. 8 is a perspective view of the upper swing body 3 when the right front portion of the upper swing 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 is different 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 points. Therefore, description of common parts is omitted, and different parts are 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 FIG. In the example of FIG. 8, there is no gap 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 at 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 (the surface on the Z1 side) of the right front cover 22F so as to correspond to the position of the level gauge 36G provided at the left front portion of the urea water tank 36. A through hole is formed on the left side of the headlamp cover 220b.

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

  As described above, the small swivel excavator according to the embodiment of the present invention allows the urea water tank 36 to be appropriately replenished with the urea water tank 36 with the urea water tank 36 attached to the airframe. Specifically, in the small swivel 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. And a second opening OP2. 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. In addition, the operator who replenishes the urea water tank 36 visually confirms the level gauge 36G from the upper side through the second opening OP2 at the time of replenishment. 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 include a right front cover 22F that covers the right front portion of the upper swing body 3 and a right side cover 22R that covers the right side portion of the upper swing 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 a 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 in 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.

  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 need not be lockable. This is because the door 223 is locked to prevent unauthorized access to the lid 363.

  Further, the first opening OP1 and the second opening OP2 may open 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.

  In addition, an elevating step 220 may be attached to the right front cover 22F below the first opening OP1. More desirably, 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 36 </ b> X into the liquid supply port of the filler 362 with the replenishment urea water container 36 </ b> X placed on the lifting step 220. The operator can replenish 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 recognizing 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 variously modified within the scope of the present invention described in the claims.

  For example, in the above-described embodiment, the second opening OP2 is configured so that the entire level gauge 36G is exposed. This is because the operator can confirm whether or not the urea water has been replenished to the maximum allowable amount when the urea water is replenished. Another reason is that 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 such that the upper half of the level gauge 36G is exposed. 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. Moreover, it is because the penetration | invasion into rain water, earth and sand, etc. is further suppressed, so that the opening area of 2nd opening part OP2 is small.

  DESCRIPTION OF SYMBOLS 1 ... Lower traveling body 2 ... Turning mechanism 3 ... Upper turning 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 bracket 14R ... right bracket 22 ... cover 22F ... right front cover 22R ... right side Cover 22RP ... Seal member 22RX ... Shaft 24 ... Fuel tank 26 ... Hydraulic oil tank 28 ... Counterweight 30 ... Engine hood 32 ... Passage 34 ... Work scaffolding 36 ... urea water tank 36G ... level gauge 36X ... urea water container for replenishment 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 ... Hand rail 80 ... Cover frame part 81, 82 ... Vertical frame 83 ... Connecting frame 84, 85 ... Horizontal frame 90 ... SCR cover 92 ... Exhaust pipe (muffler) 100 ... Tank casing part 101 ... Vertical Plate 102 ... Upper plate 103 ... Support bracket 220, 221, 222, 300c ... Elevating step 220a, 221a, 222a ... Non-slip 220b ... Headlight cover 223 ... Door 224 ..Door knob 300 ... Revolving frame 300a ... Bottom plate 300b ... Beam part 361 ... Product enlarged portion 362 ... filler 362a ... protective member 363 ... cover 400 ... boom foot pin H, S ... region OP1 ... first opening OP2 ... second opening

Claims (6)

A lower traveling body,
An upper swivel body that is turnably mounted on the lower traveling body;
A liquid reducing agent tank disposed in the right front portion of the upper swing body,
A cover that covers the liquid reducing agent tank provided on the upper swing body,
The cover includes a first opening corresponding to a liquid supply port of the liquid reducing agent tank and a second opening corresponding to a level gauge of the liquid reducing agent tank.
Small swivel excavator. The cover includes a right front cover that covers a right front portion of the upper swing body, and a right side cover that covers a right side portion of the upper swing body,
The first opening is formed in the right front cover,
The second opening is formed in a gap between the right front cover and the right side cover.
The small swivel excavator according to claim 1. The cover includes a right front cover that covers a right front portion of the upper swing body,
The first opening and the second opening are formed in the right front cover.
The small swivel excavator according to claim 1. A door with a key is attached to the first opening.
The small swivel excavator according to any one of claims 1 to 3. The first opening and the second opening are open in substantially the same direction;
The small swivel excavator according to claim 1. A step is attached to the right front cover below the first opening.
The small swivel excavator according to claim 2 or 3.