JP5684160B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine, and more particularly to a construction machine equipped with a liquid reducing agent tank storing a liquid reducing agent.

  In recent years, construction equipment such as hydraulic excavators equipped with diesel engines has been installed with exhaust gas treatment equipment in the exhaust system of diesel engines to meet higher-level exhaust gas regulations. Is released into the atmosphere through the NOx reduction catalyst provided in

  Conventionally, as this type of exhaust gas treatment apparatus, a urea selective reduction type NOx treatment apparatus using a urea aqueous solution (liquid reducing agent) is often adopted, and the urea aqueous solution is stored in a liquid reducing agent tank. Further, the liquid reducing agent tank is connected to an exhaust pipe by a liquid reducing agent supply pipe, and a urea aqueous solution in the liquid reducing agent tank can be supplied to the exhaust pipe by a liquid reducing agent supply pump (patent). Reference 1).

JP 2010-236208 A

  By the way, when the liquid reducing agent decreases with the exhaust gas treatment, it is necessary to supply the liquid reducing agent to the liquid reducing agent tank. However, supply facilities for liquid reducing agent (urea aqueous solution) are not well-equipped compared to engine fuel (gasoline, light oil, etc.). In addition, construction machines are rarely used at certain work sites, and are often used at various work sites.

  Therefore, when the construction machine is used at a work site where the supply facility for the liquid reducing agent is prepared, the capacity of the tank for the liquid reducing agent may be small, but the construction machine is used at the work site where the supply facility is not prepared. In some cases, it is desirable to mount a large amount of liquid reducing agent on the construction machine in advance.

  However, since the capacity of the liquid reducing agent tank is constant in the conventional construction machine, there is a problem in that the above demand cannot be met.

  This invention is made | formed in view of said point, and aims at providing the construction machine which can add the tank for liquid reducing agents easily.

From the first point of view, the above problem is
In a construction machine in which a support bracket and a tool box for mounting a boom are provided at the front of the upper swing body, and exhaust gas treatment is performed using a liquid reducing agent,
The liquid reducing agent is stored and disposed near the front side of the fuel tank disposed on the upper swing body, on the right outer side of the support bracket and close to the rear side of the tool box. A main tank for liquid reducing agent arranged
A construction machine characterized by having a liquid reducing agent expansion tank that is detachably connected to the main tank for liquid reducing agent via a pipe joint or a hose in the vicinity of the front side. it can.

  According to the disclosed invention, an additional tank for liquid reducing agent can be attached to and detached from the main tank for liquid reducing agent via a pipe joint or a hose, so that the amount of liquid reducing agent stored can be easily adjusted as necessary. It becomes possible to do.

FIG. 1 is a side view of a construction machine according to a first embodiment of the present invention. FIG. 2 is a plan view showing the upper swing body of the construction machine according to the first embodiment of the present invention. FIG. 3 is a perspective view for explaining a tank for liquid reducing agent mounted on the construction machine according to the first embodiment of the present invention. FIG. 4 is an enlarged configuration diagram showing a liquid reducing agent tank mounted on the construction machine according to the first embodiment of the present invention. FIG. 5 is a configuration diagram for explaining a modification of the liquid reducing agent tank mounted on the construction machine according to the first embodiment. FIG. 6 is a view for explaining a pipe joint. FIG. 7 is a perspective view for explaining a liquid reducing agent tank mounted on a construction machine according to a second embodiment of the present invention. FIG. 8 is an enlarged configuration diagram showing a liquid reducing agent tank mounted on the construction machine according to the second embodiment of the present invention. FIG. 9 is a configuration diagram for explaining a modified example of the tank for liquid reducing agent mounted on the construction machine according to the second embodiment. FIG. 10 is a perspective view for explaining a liquid reducing agent tank mounted on a construction machine according to a third embodiment of the present invention. FIG. 11 is an enlarged configuration diagram showing a liquid reducing agent tank mounted on a construction machine according to a third embodiment of the present invention.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 are views for explaining a construction machine according to a first embodiment of the present invention. In the present embodiment, a hydraulic excavator will be described as an example of a construction machine. However, the present invention can be widely applied to construction machines having a tank that stores a liquid reducing agent.

  FIG. 1 is a view showing an appearance of a construction machine according to a first embodiment of the present invention. As shown in the figure, an upper swing body 2 is mounted on the lower traveling body 1 so as to be capable of swinging, and a cab 3 is provided on one front side of the upper swing body 2. A boom 4 is pivotally attached to the front center portion of the upper swing body 2 so that the boom 4 can be raised and lowered, and an arm 5 is connected to the tip portion of the boom 4 so as to be vertically rotatable, and a bucket is attached to the tip portion of the arm 5. 6 is attached so that rotation up and down is possible.

  As shown in FIG. 2, an engine room 7 is formed at the rear of the upper swing body 2, and a diesel engine 8 is installed in the engine room 7. A cooling fan 12 is provided on the front side (front side in FIG. 2) of the diesel engine 8, and a heat exchanger unit 13 including a radiator or the like is installed on the front side of the cooling fan 12.

  Further, an exhaust pipe 9 is connected to the diesel engine 8, and an exhaust gas treatment device 10 is installed on the downstream side of the exhaust pipe 9 in order to comply with higher-order exhaust gas regulations. As the exhaust gas treatment apparatus 10 according to the present embodiment, a urea selective reduction type NOx treatment apparatus using a urea aqueous solution (liquid reducing agent) is adopted.

As shown in FIG. 3, a pair of left and right boom mounting support brackets 17 </ b> L and 17 </ b> R are erected on the front portion of the upper swing body 2. A tool box 16 is provided outside the support bracket 17R (front side in FIG. 3). The tool box 16 has an upper surface opened, and the opening is covered with a cover body 16a so as to be opened and closed.

A fuel tank 18 is disposed outside the support bracket 17R and behind the tool box 16. Further, a space is formed between the tool box 16 and the fuel tank 18, and the liquid reducing agent main tank 11A is fixed in the space. Therefore, the liquid reducing agent main tank 11 </ b> A is disposed close to the fuel tank 18.

  The liquid reducing agent main tank 11 </ b> A stores a liquid reducing agent (urea aqueous solution) supplied to the exhaust gas treatment device 10. Further, the liquid reducing agent main tank 11A is connected to the exhaust gas treatment device 10 via a liquid reducing agent supply pipe 29 (not shown in FIG. 3, see FIG. 4). Therefore, the liquid reducing agent in the liquid reducing agent main tank 11 </ b> A is supplied to the exhaust gas treatment device 10 through the liquid reducing agent supply pipe 29.

  In the construction apparatus according to this embodiment, in addition to the liquid reducing agent main tank 11A (hereinafter abbreviated as main tank 11A), a liquid reducing agent expansion tank 14A (hereinafter abbreviated as expansion tank 14A) is provided. Yes. The expansion tank 14A is also a tank that stores the liquid reducing agent therein. In the present embodiment, the additional tank 14A is installed in the tool box 16.

  The expansion tank 14A is detachably connected to the main tank 11A via a reducing agent fitting 20A described later. Therefore, by connecting the expansion tank 14A to the main tank 11A, the storage amount of the liquid reducing agent stored in the construction machine is increased by the capacity of the expansion tank 14A.

  The material of the main tank 11A and the extension tank 14A is not particularly limited, and may be made of resin (for example, polyethylene resin) or metal.

  Next, a connection structure between the main tank 11A and the extension tank 14A will be described with reference to FIGS.

  The main tank 11A and the expansion tank 14A are detachably connected by a reducing agent pipe joint 20A. The liquid reducing agent is supplied from the expansion tank 14A to the main tank 11A via the reducing agent pipe joint 20A.

  Further, each of the tanks 11A and 14A needs to be vented because the filled liquid reducing agent decreases with use. Therefore, each of the tanks 11A and 14A is provided with air vent pipe joints 25A and 25B used for venting air (in FIG. 3, the reducing agent pipe joint 20A and the air vent pipe joints 25A and 25B are provided). (The illustration is omitted).

  In the present embodiment, the reducing agent pipe joint 20A and the air vent pipe joints 25A, 25B have the same configuration. However, the pipe joints 20A, 25A, and 25B can be configured differently.

  Here, the structure of the reducing agent pipe joint 20A and the air vent pipe joints 25A and 25B will be described with reference to FIG.

  FIG. 5 (A) shows a state before connection of each pipe joint, and FIG. 5 (B) shows a state after connection of each pipe joint. Since the pipe joints 20A, 25A, and 25B have the same configuration as described above, only the reducing agent pipe joint 20A will be described, and the components of the pipe joints 25A and 25B are shown in parentheses. In addition, the addition of “A, B” is deleted from each reference numeral of the component.

  The pipe joint 20 (25) includes a socket 21 (26) and a plug 22 (27). The socket 21 (26) is connected to the liquid reducing agent main tank 11A via the connection hose 23, and the plug 22 (27) is connected to the liquid reducing agent expansion tank 14A via the connection hose 24.

  The plug 22 (27) is automatically connected only by being inserted into the socket 21 (26). That is, the socket 21 (26) and the plug 22 (27) are so-called one-touch connection type pipe joints.

  To connect the main tank 11A and the expansion tank 14A, first, the socket 21 (26) and the plug 22 (27) are aligned as shown in FIG. Subsequently, the plug 22 (27) is inserted into the socket 21 (26). Accordingly, as shown in FIG. 5B, the main tank 11A and the additional tank 14A are connected by the pipe joint 20 (25).

  On the other hand, in order to release the connection between the socket 21 (26) and the plug 22 (27), the sleeve 32 provided in the socket 21 (26) is moved in the direction indicated by the arrow A in FIG. Thereby, the connection between the socket 21 (26) and the plug 22 (27) is released, and the main tank 11A and the expansion tank 14A are separated.

  As described above, the socket 21 (26) and the plug 22 (27) can be easily connected and disconnected, and therefore the main tank 11A and the expansion tank 14A can be connected and disconnected with good operability. The socket 21 (26) and the plug 22 (27) have a normally closed valve structure, and the socket 21 (26) and the plug 22 (27) are disconnected in a state where the connection between the socket 21 (26) and the plug 22 (27) is released. The liquid reducing agent does not leak from the plug 22 (27).

  Here, returning to FIG. 4 again, the description of the connection structure of the main tank 11A and the additional tank 14A will be continued.

  FIG. 4A shows a state before the expansion tank 14A is connected to the main tank 11A. The main tank 11 </ b> A is fixed on the floor surface 19 of the upper swing body 2. Further, the main tank 11A is connected to the exhaust gas treatment device 10 via the liquid reducing agent supply pipe 29 as described above. The liquid reducing agent is supplied to the exhaust gas treatment device 10 through the liquid reducing agent supply pipe 29.

  The reducing agent socket 21A constituting the reducing agent pipe joint 20A is provided on the lower surface of the main tank 11A on the surface facing the expansion tank 14A. Further, the reducing agent plug 22A constituting the reducing agent pipe joint 20A is provided at a position corresponding to the arrangement position of the reducing agent socket 21A in the lower part of the expansion tank 14A.

As described above, the expansion tank 14A is disposed in the tool box 16, but a connection opening (not shown) is formed at a position corresponding to the reducing agent pipe joint 20A of the tool box 16. The reducing agent socket 21A and the reducing agent plug 22A are connected and disconnected through the connection opening.

  An air vent socket 26A constituting an air vent pipe joint 25A is provided on the upper portion of the main tank 11A. In addition, an air vent socket 26B constituting an air vent pipe joint 25B is formed on the upper portion of the expansion tank 14A.

  An air vent plug 27A that constitutes an air vent pipe joint 25A is provided at one end of the air vent hose 28 used for venting the tanks 11A and 14A. Further, an air vent plug 27B constituting an air vent pipe joint 25B is provided at the other end of the air vent hose 28.

  In order to increase the expansion tank 14A, the expansion tank 14A is inserted into the tool box 16, and the reducing agent plug 22A is connected to the reducing agent socket 21A provided in the main tank 11A. As described above, the expansion work is simply an operation of simply connecting the reducing agent plug 22A to the reducing agent socket 21A, and therefore can be easily performed.

  Subsequently, an air vent plug 27A provided at one end of the air vent hose 28 is joined to an air vent socket 26A provided at the upper portion of the main tank 11A, and an air vent plug 27B provided at the other end. Is connected to the air vent socket 26B.

  With this simple operation, the expansion tank 14A can be added to the main tank 11A. By adding the expansion tank 14A, it is possible to increase the storage amount of the liquid reducing agent as compared to before the expansion.

  The tool box 16 is formed with an insertion hole (not shown) through which the air bleeding hose 28 is inserted. In FIG. 3, the air vent pipe joints 25 </ b> A and 25 </ b> B and the air vent hose 28 are not shown.

  In the construction machine according to the present embodiment, when the construction machine is used at a work site where supply facilities are not prepared, the additional tank 14A is added in advance as described above, and a large amount of liquid reducing agent is mounted on the construction machine. It becomes possible to keep. Thereby, the supply frequency of a liquid reducing agent can be reduced and the operating efficiency of a construction machine can be improved.

  Further, when the construction machine is used at a work site where the supply facility for the liquid reducing agent is prepared, the expansion tank 14A can be removed. For this reason, in the removed state, the upper revolving unit 2 can be reduced in weight and the storage capacity of the tool box 16 can be increased.

  The expansion tank 14A is installed in a tool box 16 disposed on the outer side of the upper swing body 2. Therefore, when the liquid reducing agent (urea aqueous solution) is replenished to the expansion tank 14A, it can be directly replenished from the upper part of the tool box 16 to the expansion tank 14A. As a result, the operator can easily and quickly supply the liquid reducing agent to the expansion tank 14A.

  Further, in the present embodiment, the main tank 11 </ b> A and the additional tank 14 </ b> A are both disposed in the vicinity of the fuel tank 18. Since the fuel tank 18 has heat during operation of the construction machine, the temperature of each of the tanks 11A and 14A can be raised by this heat. Thereby, it is possible to prevent the liquid reducing agent in the tanks 11A and 14A from freezing.

  FIG. 6 shows the deformability of the first embodiment described above.

  In FIG. 6, components corresponding to those shown in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted.

  In the embodiment described with reference to FIG. 4, a reducing agent socket 21A is provided on the side surface of the main tank 11B, and a reducing agent plug 22A is provided on the side surface of the additional tank 14B, and the main tank 11A is connected to the reducing agent pipe joint 20A. And the expansion tank 14A are directly connected.

  On the other hand, in the present modification, a liquid reducing agent supply pipe 30 is disposed below the floor surface 19, and the liquid reducing agent supply pipe 30 is provided with a liquid reducing agent main tank 11B (hereinafter abbreviated as main tank 11B). ) Are directly connected and fixed, and at the end of the liquid reducing agent supply pipe 30, a reducing agent socket 21B to which a liquid reducing agent expansion tank 14B (hereinafter abbreviated as an expansion tank 14B) is connected is provided. It is characterized by.

  The liquid reducing agent supply pipe 30 functions as a connection pipe that connects the main tank 11B and the expansion tank 14B, and also functions as a liquid reducing agent supply pipe that supplies the liquid reducing agent to the exhaust gas treatment apparatus 10.

  FIG. 6A shows a state before the expansion tank 14B is connected. In the present modification, the reducing agent socket 21 </ b> B constituting the reducing agent pipe joint 20 </ b> B is disposed on the floor surface 19. The reducing agent socket 21 </ b> B is connected to the liquid reducing agent supply pipe 30. On the other hand, the reducing agent plug 22B constituting the reducing agent pipe joint 20B is disposed on the bottom surface of the expansion tank 14B.

  As described above, in the present modification, the reducing agent socket 21B is provided on the floor surface 19. Therefore, when the expansion tank 14B is added, the operator can check the reducing agent socket 21B from above. The reducing agent plug 22B is formed on the bottom surface of the expansion tank 14B. Therefore, in this modification, since the operator can join the reducing agent plug 22B and the reducing agent socket 21B while visually checking the reducing agent socket 21B, the extension tank 14B can be easily expanded. Can do.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 shows a liquid reducing agent main tank 11C (hereinafter abbreviated as main tank 11C) and a liquid reducing agent expansion tank 14C (hereinafter abbreviated as expansion tank 14C) provided in the construction machine according to the second embodiment. ). FIG. 8A shows a state before the expansion tank 14C is connected to the liquid reducing agent main tank 11C, and FIG. 8B shows the state after the expansion tank 14C is connected to the liquid reducing agent main tank 11C. Indicates the state. FIG. 9 shows a modification of the second embodiment.

  7 to 9, the same reference numerals are given to the components corresponding to those shown in FIGS. 1 to 6, and the description thereof will be omitted.

  In the first embodiment described above, the configurations of the main tank 11A and the expansion tank 14A are different. On the other hand, the present embodiment is characterized in that the main tank 11C and the additional tank 14C have the same configuration.

  As shown in FIG. 8, the main tank 11 </ b> C is disposed on the floor surface 19. The main tank 11C is provided with a reducing agent socket 21A that constitutes a reducing agent pipe joint 20A at the lower portion of the facing surface 33 facing the expansion tank 14C. Further, an air vent plug 27 </ b> C constituting the air vent pipe joint 25 </ b> C is provided on the upper portion of the facing surface 33. The air vent pipe joint 25C has the same configuration as the pipe joints 20A, 20B, 25A, 25B.

  In addition, a pipe connection portion 35 to which the liquid reducing agent supply pipe 29 is connected is provided at the lower part of the surface opposite to the facing surface 33 (referred to as the back surface 34). Therefore, the main tank 11 </ b> C is connected to the exhaust gas treatment device 10 via the pipe connection part 35 and the liquid reducing agent supply pipe 29.

  On the other hand, the expansion tank 14C is arranged on the floor surface 19 in a state where the upper and lower sides are inverted with respect to the state of the main tank 11C. Therefore, the reducing agent plug 22A constituting the reducing agent pipe joint 20A is located below the facing surface 33 of the expansion tank 14C. Further, an air vent socket 26 </ b> C constituting the air vent pipe joint 25 </ b> C is positioned on the upper portion of the facing surface 33. Further, a pipe connection portion 35 is located at the upper portion of the back surface 34 of the expansion tank 14C. The pipe connection portion 35 is closed with a plug (not shown), and the liquid reducing agent (urea aqueous solution) does not leak to the outside from the pipe connection portion 35.

  Each of the pipe joints 20A and 25C has the reducing agent socket 21A and the reducing agent plug 22A facing each other in a state where the main tank 11C and the expansion tank 14C are disposed on the floor surface 19, and the air vent plug 27C and the air The extraction socket 26C is configured to face each other.

  In order to connect the expansion tank 14C to the main tank 11C, the expansion tank 14C is moved along the floor surface 19 toward the main tank 11C. Accordingly, as shown in FIG. 8B, the reducing agent plug 22A is coupled to the reducing agent socket 21A, and the air vent plug 27C is coupled to the air vent socket 26C. Thus, in this embodiment, the connection process of the main tank 11C and the expansion tank 14C can be performed easily.

  In the present embodiment, the main tank 11C and the expansion tank 14C have the same configuration. For this reason, the cost of each tank 11C, 14C can be reduced compared with the case where a main tank and an expansion tank are made into another structure.

  FIG. 9 shows a modification of the second embodiment.

  FIG. 9A shows a state before the expansion tank 14B is connected to the liquid reducing agent main tank 11D (hereinafter abbreviated as the main tank 11D). FIG. 9B shows the expansion tank 14B and the main tank 11D. The state after connecting with tank 11D is shown.

  In the present modification, the liquid reducing agent supply pipe 30 is disposed below the floor surface 19. The liquid reducing agent main tank 11 </ b> D is fixed with its lower part connected to the liquid reducing agent supply pipe 30. Further, an air vent socket 26A constituting an air vent pipe joint 25A is provided on the upper surface of the main tank 11D, and an air vent plug 27A of the air vent hose 28 is joined. .

  In this modification, the expansion tank 14B described with reference to FIG. 6 is used as the expansion tank. Accordingly, a reducing agent plug 22B constituting the reducing agent pipe joint 20B is provided on the lower surface of the expansion tank 14B, and an air vent socket 26B constituting the air vent pipe joint 25B is provided on the upper face. .

  The reducing agent socket 21 </ b> B is fixed to the floor 19 and connected to the liquid reducing agent supply pipe 30. The reducing agent plug 22B is detachably connected to the reducing agent socket 21B.

  Therefore, in this modification as well, when connecting the reducing agent plug 22B to the reducing agent socket 21B, the operator can confirm the position of the reducing agent socket 21B, so that the expansion process of the expansion tank 14B can be easily performed. .

  In this modification, the tank main body (container portion excluding the pipe joint and the like) of the main tank 11D and the tank main body (container portion excluding the pipe joint and the like) of the expansion tank 14B have the same configuration. Therefore, compared with the case where the tank main body of the main tank and the tank main body of the additional tank are separately configured, the cost of each of the tanks 11D and 14B can be reduced by adopting the configuration of this modification.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 10 shows a liquid reducing agent main tank 11D (hereinafter abbreviated as main tank 11D) and an additional tank 14B provided in the construction machine according to the third embodiment. FIG. 11A shows a state before the expansion tank 14B and the liquid reducing agent main tank 11D are connected, and FIG. 11B shows the connection between the expansion tank 14B and the liquid reducing agent main tank 11D. The later state is shown.

  10 to 11, the same reference numerals are given to the components corresponding to those shown in FIGS. 1 to 9, and the description thereof will be omitted. Further, in FIG. 10, illustration of the air vent pipe joints 25 </ b> A and 25 </ b> B and the air vent hose 28 is omitted.

The present embodiment is characterized in that, in the modification of the second embodiment described with reference to FIG. 9, one additional tank 14B is further provided and two additional tanks 14B are provided. The arrangement position of the expansion tank is not limited to the side position (in the tool box 16) of the main tank shown in the above-described embodiments, and the expansion tank 14B may be provided above the main tank 11D. Is possible.

  The extension tank 14B is added to the upper part of the main tank 11D using the reducing agent pipe joint 20C. The reducing agent pipe joint 20C is a pipe joint that has the same configuration as the reducing agent pipe joints 20A and 20B and the air vent pipe joints 25A, 25B, and 25C. The reducing agent pipe joint 20C includes a reducing agent socket 21C provided on the upper surface of the main tank 11D and a reducing agent plug 22C provided on the lower surface of the expansion tank 14B.

  In this embodiment, when connecting the reducing agent plug 22C to the reducing agent socket 21C, the operator can attach the expansion tank 14B to the main tank 11D while confirming the position of the reducing agent socket 21C. Therefore, it is possible to easily perform the process of adding the extension tank 14B on the main tank 11D.

  Also in this embodiment, the tank body of the main tank 11D and the tank body of each additional tank 14B have the same configuration. Therefore, compared with the case where the tank main body of the main tank and the tank main body of the additional tank are provided separately, the cost of each of the tanks 11D and 14B can be reduced.

  Further, as in the present embodiment, by reducing the individual filling amount of each tank 11D, 14B filled with the liquid reducing agent and subdividing it, the so-called dead space in the upper swing body 2 is reduced to the liquid reducing agent tank. It can be used as a storage area, and effective use in the engine room 7 can be achieved.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

  The present invention can also be applied to a construction machine equipped with a liquid reducing agent tank in which a liquid reducing agent other than an aqueous urea solution is stored in the liquid reducing agent tank.

2 Upper swing body 7 Engine room 8 Diesel engine 9 Exhaust pipe 10 Exhaust gas treatment devices 11A, 11B, 11C, 11D (for liquid reducing agent) Main tanks 14A, 14B (for liquid reducing agent) Additional tank 16 Tool boxes 17L, 17R Bracket 18 Fuel tank 20A, 20B, 20C Reducing agent fittings 21A, 21B, 21C Reducing agent sockets 22A, 22B, 22C Reducing agent plugs 23, 24 Connecting hoses 25A, 25B, 25C Air venting fittings 26A, 26B 26C Air vent sockets 27A, 27B, 27C Air vent plugs 28 Air vent hoses 29, 30 Liquid reducing agent supply piping

Claims (5)

In a construction machine in which a support bracket and a tool box for mounting a boom are provided at the front of the upper swing body, and exhaust gas treatment is performed using a liquid reducing agent,
The liquid reducing agent is stored and disposed near the front side of the fuel tank disposed on the upper swing body, on the right outer side of the support bracket and close to the rear side of the tool box. A main tank for liquid reducing agent arranged
A construction machine comprising a liquid reducing agent expansion tank that is detachably connected to the main tank for liquid reducing agent via a pipe joint or a hose in the vicinity of the front side . The construction machine according to claim 1, wherein the expansion tank for the liquid reducing agent is installed in the tool box.   In a construction machine in which a support bracket and a tool box for mounting a boom are provided at the front of the upper swing body, and exhaust gas treatment is performed using a liquid reducing agent,
  The liquid reducing agent is stored and disposed near the front side of the fuel tank disposed on the upper swing body, and is disposed on the right outer side of the support bracket and near the rear side of the tool box. A main tank for the liquid reducing agent,
  A construction machine comprising a liquid reducing agent expansion tank that is detachably connected to the liquid reducing agent main tank via a pipe joint or a hose in the vicinity of the upper side. The construction machine according to any one of claims 1 to 3 , wherein the liquid reducing agent main tank and the liquid reducing agent extension tank have the same configuration. The construction machine according to any one of claims 1 to 4 , wherein the pipe joint is constituted by a plug and a socket, and is automatically connected by inserting the plug into the socket.

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