JP6549455B2 - Shovel - Google Patents

Description

  The present invention relates to a shovel mounted with an exhaust gas treatment device.

  In recent years, in construction machines such as hydraulic excavators equipped with a diesel engine, an exhaust gas treatment device is installed in the exhaust system of the diesel engine in order to comply with high-level exhaust gas regulations, and exhaust gas from the diesel engine The catalyst is released to the atmosphere through the NOx reduction catalyst provided downstream of the As the above-mentioned exhaust gas treatment apparatus, a selective reduction type NOx treatment apparatus using a reducing agent solution (liquid reducing agent) is often used. An example of a shovel equipped with such an exhaust gas treatment device is shown in FIG.

  The illustrated shovel has an upper swing body 2, a cab 3, and a boom 4 as a basic configuration. A house cover 21 having an engine cover 21A and a top cover 21B is installed on the upper part of the upper swing body 2, and an engine room 7 is formed inside. In the engine compartment 7, the exhaust gas processing device 10 described above is disposed together with the diesel engine 8, the cooling fan 12 and the heat exchanger unit 13. Further, a reducing agent tank 20, a fuel tank 19, and a hydraulic oil tank 18 are disposed on the opposite side (Y2 side) of the cab 3 of the upper swing body 2. The reducing agent tank 20 is connected to the exhaust gas treatment device 10 via a reducing agent pipe NH and a reducing agent supply pump NP. The exhaust gas processing apparatus 10 injects a reducing agent on the upstream side of a reduction catalyst (not shown) provided in the exhaust pipe 9c to reduce NOx in the exhaust gas, and promotes this reduction reaction by the reduction catalyst. To make the NOx harmless.

  In the shovel having the above configuration, the reducing agent piping NH connected to the reducing agent tank 20 (urea water tank) is located on the rear side along the right boom frame 14R that supports the boom 4 disposed inside the top cover 21B ( It extends in the direction of the arrow X2) and is inserted in the gap between the hydraulic oil tank 18 and the control valve 15 in a manner to be inserted.

  Moreover, also in the shovel mounted with the exhaust gas treatment device disclosed in Patent Document 1, the reducing agent piping connected to the reducing agent tank is disposed inside the house cover in which the engine, the heat exchanger, and the control valve are installed. It is done.

JP, 2010-261373, A

  By the way, if the temperature of the reductant becomes high due to heat reception before it is injected into the exhaust pipe, the components are thermally decomposed and converted to ammonia, so there is a risk that an appropriate reduction reaction can not be obtained when it is mixed with the exhaust gas. is there. Therefore, it is necessary to take care so that the temperature of the reducing agent does not rise as much as possible.

  However, the above-described conventional shovel is configured to route the reducing agent piping inside the house cover. Furthermore, since the construction is arranged around equipment that becomes hot such as an engine, a heat exchanger, and a control valve, the reducing agent receives heat from the high-temperature equipment and is in a state where the temperature tends to rise.

  In short, the shovel mounted with the conventional exhaust gas treatment device was not configured in consideration of preventing the temperature rise of the reducing agent.

  In addition, since the reducing agent piping is disposed inside the house cover, there is a problem that the maintenance operation becomes very troublesome.

  In view of the above problems, one object of the present embodiment is to provide a shovel capable of preventing the temperature rise due to the heat receiving of the reducing agent and realizing the efficiency of the maintenance work.

The shovel according to an embodiment of the present invention is
An exhaust gas treatment device for purifying exhaust gas;
A reducing agent tank in which a reducing agent for processing the exhaust gas is stored;
Reducing agent piping for supplying the reducing agent of the reducing agent tank to the exhaust gas treatment device;
A heating element and / or a radiator
A shielding wall forming a housing space for housing the heat generating body and / or the heat radiating body;
A shovel having
The reducing agent pipe is disposed outside the accommodation space and along a separated space which alone accommodates the reducing agent pipe of which the shielding wall forms a part .

  According to the above-described means, a shovel is provided that can prevent the temperature rise due to the heat receiving of the reducing agent and can realize the efficiency of maintenance work.

It is a side view of a shovel. It is a top view which shows roughly the upper revolving superstructure of the shovel of a 1st embodiment. It is a figure which shows the structural example of the exhaust gas processing apparatus mounted in the shovel of FIG. FIG. 6 is an enlarged side view showing the arrangement of reducing agent piping around the hydraulic oil tank. It is an enlarged side view showing the arrangement state of the reducing agent piping around the control valve. It is a top view which shows roughly the upper revolving superstructure of the shovel of 3rd Embodiment. FIG. 6 is an enlarged side view showing the arrangement of reducing agent piping around a diesel engine. It is an enlarged side view which shows the installation state of the reducing agent piping around a heat exchanger unit. It is the elements on larger scale which show the wiring relationship between wiring for warm-up and reductant piping. It is a top view which shows the upper revolving super structure of the conventional shovel roughly.

  A non-limiting embodiment of the present invention will now be described with reference to the accompanying drawings. In the attached drawings, the same or corresponding reference numerals are attached to the same or corresponding members or parts. Moreover, the overlapping description of the same or corresponding members or parts will be omitted below. Also, the drawings are not intended to indicate relative ratios between members or parts, unless otherwise specified. Accordingly, those skilled in the art can arbitrarily determine specific dimensions with reference to the following non-limiting embodiments. In addition, the following embodiments do not limit the invention and are merely examples, and all the features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 shows a side view of a shovel (excavator) which is an example of a construction machine according to a first embodiment of the present invention. In the shovel, the upper swing body 2 is rotatably mounted on the lower traveling body 1, and the cab 3 is provided on the front left side portion of the upper swing body 2. Further, the boom 4 is rotatably connected to the front central portion of the upper swing body 2, and the arm 5 is rotatably connected to the tip end of the boom 4. Further, a bucket 6 is rotatably connected to the tip of the arm 5.

  Here, in the present specification, the front side of the upper swing body 2 is a portion on the side where the boom 4 is attached as viewed from the center of the upper swing body 2. Moreover, the left side is a portion which becomes the left when it faces the front (direction where boom 4 extends) in upper revolving superstructure 2. Further, the right side is a portion that is the right when the upper structure 2 is directed forward (in the direction in which the boom 4 extends).

  FIG. 2 is a plan view schematically showing the upper swing body 2. As shown in FIG. 2, the boom 4 is rotatably supported near the center of the front side (arrow X1 side) of the upper swing body 2.

  The boom 4 is rotatably supported by a boom frame 14 as a support frame fixed firmly to the front center position of the upper swing body 2. More specifically, the boom 4 is provided between the right side frame 14R, the boom 4 and the left side frame 14L while being sandwiched between the right side frame 14R and the left side frame 14L of the boom frame 14 Supported by 400.

  An engine room 7 is formed in the upper revolving superstructure 2. In the engine room 7, a diesel engine 8 as a heating element is installed. Further, a cooling fan 12 is provided on the Y1 side of the diesel engine 8, and a heat exchanger unit 13 as a radiator including a radiator and the like is provided on the Y1 side of the cooling fan 12.

  Further, the diesel engine 8 sucks outside air through an air filter 9a and an intake pipe 9b installed outside the engine room 7. Furthermore, an exhaust pipe 9c is connected to the diesel engine 8, and an exhaust gas processing device 10 for purifying nitrogen oxides (hereinafter referred to as NOx) in the engine exhaust gas is installed downstream of the exhaust pipe 9c. .

  In the present embodiment, the exhaust gas processing apparatus 10 is a selective reduction type NOx processing apparatus using a reducing agent such as urea water. The exhaust gas processing apparatus 10 injects a reducing agent on the upstream side of a reduction catalyst (not shown) provided in the exhaust pipe 9c to reduce NOx in the exhaust gas, and promotes this reduction reaction by the reduction catalyst. Detoxifies NOx.

  The reducing agent tank 20 is a container for storing the reducing agent, and is disposed on the opposite side (Y2 side) of the cab 3 with the boom 4 of the upper swing body 2 interposed therebetween. Further, a fuel tank 19 is disposed at the rear (X2 side) of the reducing agent tank 20, and a hydraulic oil tank 18 as a heating element is disposed at the rear (X2 side) of the fuel tank 19. The hydraulic oil tank 18, the fuel tank 19, and the reducing agent tank 20 are installed outside the engine room 7.

  A shielding wall 17 for blocking the heat from the hydraulic oil tank 18 is provided on the side surface on the inner side (arrow Y1 side) of the hydraulic oil tank 18. The shielding wall 17 is disposed at a predetermined distance from the hydraulic oil tank 18. Reference S1 is a space between the shielding wall 17 and the hydraulic oil tank 18. Moreover, code | symbol S1 is an accommodation space which accommodates the hydraulic oil tank 18 if it says in a big concept (Hereafter, it is called accommodation space S1.). Further, an upper surface cover (dotted line) may be provided above the hydraulic oil tank 18, and the upper surface cover and the shielding wall 17 may form a sealed space (S1) (see FIG. 3). However, the top cover does not necessarily have to be provided.

  In addition, the reducing agent tank 20 is connected to the exhaust gas treatment device 10 via the reducing agent pipe 69 and the reducing agent supply pump NP. In addition, the reducing agent pipe 69 may be configured to be able to be connected and separated at one or more joint portions.

  A control valve 15 as a heating element is disposed on the rear side (arrow X2 side) of the boom frame 14 and at a substantially central position of the upper swing body 2.

The upper surface of the upper swing body 2 is covered by a house cover 21. The house cover 21 has an engine cover 21A which covers at least the upper surface of the engine compartment 7, and a top cover 21B which covers the upper surface of the control valve 15 and the upper surfaces of rear end portions of the boom frames 14R and 14L.
A counterweight 22 is provided at the rear end (the arrow X2 side) of the upper swing body 2.

The shovel of the present embodiment is characterized in that the reducing agent pipe 69 is disposed outside the accommodation space S1 and along the outer wall surface of the shielding wall 17. As will be described in detail later, the reducing agent piping 69 is disposed at a position thermally separated from the control valve 15 as the heating element and the hydraulic oil tank 18, whereby the reducing agent in the piping 69 receives heat from the heating element. It is the structure which prevents temperature rising.
FIG. 3 is a schematic view showing a configuration example of the exhaust gas treatment device 10. As shown in FIG. In the present embodiment, the exhaust gas processing device 10 purifies the exhaust gas discharged from the diesel engine 8. The diesel engine 8 is controlled by an engine control module (hereinafter referred to as "ECM") 60.

  The air introduced into the intake pipe 9b through the air filter 9a passes through the turbocharger 61, the intercooler 65, and the like, and is supplied to the diesel engine 8. Then, the exhaust gas from the diesel engine 8 passes through the turbocharger 61, reaches the exhaust pipe 9c downstream thereof, and is exhausted to the atmosphere after the purification processing is performed by the exhaust gas processing device 10.

  In the exhaust pipe 9c, a diesel particulate filter 66 for trapping particulate matter in the exhaust gas and a selective reduction catalyst 67 for reducing and removing NOx in the exhaust gas are provided in series.

  The selective reduction catalyst 67 receives reduction agent and continuously reduces and removes NOx in the exhaust gas. For ease of handling, urea water (urea aqueous solution) may be used as a reducing agent.

  A reducing agent injection device 68 for supplying a reducing agent to the selective reduction catalyst 67 is provided on the upstream side of the selective reduction catalyst 67 in the exhaust pipe 9c. The reducing agent injection device 68 is connected to the reducing agent tank 20 via a reducing agent pipe 69.

  Further, a supply module SM is provided in the middle of the reducing agent pipe 69. The supply module SM includes a reducing agent supply pump NP and a filter 71. In the present embodiment, the supply module SM is configured such that the filter 71 is disposed between the reducing agent tank 20 and the reducing agent supply pump NP.

  The reducing agent stored in the reducing agent tank 20 is supplied to the reducing agent injection device 68 by the reducing agent supply pump NP, and is injected from the reducing agent injection device 68 to the upstream position of the selective reduction catalyst 67 in the exhaust pipe 9c.

  The reducing agent injected from the reducing agent injection device 68 is supplied to the selective reduction catalyst 67. The supplied reducing agent is hydrolyzed in the selective reduction catalyst 67 to generate ammonia. The ammonia reduces the NOx contained in the exhaust gas in the selective reduction catalyst 67. Thus, the exhaust gas is purified.

  The first NOx sensor 72 and the second NOx sensor 73 are sensors that detect the concentration of NOx in the exhaust gas. In the present embodiment, the first NOx sensor 72 is disposed upstream of the reducing agent injection device 68, and the second NOx sensor 73 is disposed downstream of the selective reduction catalyst 67.

  The reducing agent remaining amount sensor 74 is a sensor that detects the reducing agent remaining amount in the reducing agent tank 20. In the present embodiment, the reducing agent remaining amount sensor 74 is disposed above the reducing agent tank 20.

  The first NOx sensor 72, the second NOx sensor 73, the reducing agent remaining amount sensor 74, the reducing agent injection device 68, and the reducing agent supply pump NP are connected to the exhaust gas controller 75. The exhaust gas controller 75 controls the reducing agent injection device 68 and the reducing agent supply pump NP based on the NOx concentration detected by each of the first NOx sensor 72 and the second NOx sensor 73 to inject an appropriate amount of reducing agent. Let's do it.

  Further, the exhaust gas controller 75 calculates the ratio of the reducing agent remaining amount to the total volume of the reducing agent tank 20 based on the reducing agent remaining amount output from the reducing agent remaining amount sensor 74. In the present embodiment, the ratio of the remaining amount of reducing agent to the total volume of the reducing agent tank 20 is taken as the reducing agent remaining amount ratio. For example, the reducing agent remaining amount ratio of 50% indicates that half of the reducing agent tank 20 has the reducing agent remaining in the reducing agent tank 20.

  The exhaust gas controller 75 is connected to the ECM 60 via communication means. Further, the ECM 60 is connected to the shovel controller 76 via the communication means, and the shovel controller 76 is connected to the monitor 77 (display device) via the communication means. The monitor 77 displays a warning, an operation state and the like.

  The shovel controller 76 can share various information regarding the exhaust gas processing device 10 that the exhaust gas controller 75 has. The ECM 60, the exhaust gas controller 75, and the shovel controller 76 are arithmetic devices including a CPU, a RAM, a ROM, an input / output port, a storage device, and the like, respectively.

  In addition, the exhaust gas treatment device 10 has a heat supply function of supplying heat to the reducing agent tank 20 and the reducing agent pipe 69. The heat supply function is performed, for example, to prevent freezing of the reducing agent in cold regions or to dissolve the frozen reducing agent. In the present embodiment, engine cooling water (for example, long life coolant) of the diesel engine 8 passing through the cooling water hose 80 is used.

  Specifically, engine cooling water immediately after cooling the diesel engine 8 passes through the first portion 81 of the cooling water hose 80 to the second portion 82 while maintaining a relatively high temperature. The second portion 82 is a portion of the cooling water hose 80 in contact with the outer surface of the reducing agent tank 20. The engine coolant, which is hotter than the reductant, supplies heat to the reductant tank 20 and the reductant therein as it flows through the second portion 82.

  Thereafter, the engine cooling water reaches the third portion 83 and the supply module SM. The third portion 83 as a warming-up pipe is a part of the cooling water hose 80 in close contact with the reducing agent pipe 69. When the engine coolant water having a temperature higher than that of the reducing agent flows through the third portion 83 of the cooling water hose 80 along the reducing agent pipe 69, heat is supplied to the reducing agent pipe 69 and the reducing agent inside thereof. Also, the engine coolant water having a temperature higher than that of the reducing agent may flow to the supply module SM (including the reducing agent supply pump NP and the filter 71) and the reducing agent inside when flowing through the flow path formed in the supply module SM. Supply heat.

  Further, the third portion 83 of the cooling water hose 80 and the reducing agent pipe 69 of the present embodiment are integrally bundled, and the outer peripheral surface thereof is covered with the heat insulating material 90. The heat insulating material 90 is, for example, urethane, foam (sponge) or the like. Therefore, the heat insulation effect can be obtained by securing the air layer.

  After that, the engine cooling water, which has reached a relatively low temperature after the supply of heat in the second portion 82 and the third portion 83, passes through the fourth portion 84 of the cooling water hose 80 and the heat exchanger unit 13 (see FIG. 2) ). The fourth portion 84 is a part of the cooling water hose 80 disposed between the third portion 83 and the fifth portion 85 and the heat exchanger unit 13 and does not closely contact the reducing agent pipe 69.

  The fifth portion 85 is a part of a cooling water hose 80 used to cool the reducing agent injection device 68. As engine coolant that is cooler than the high temperature reducing agent injector 68 flows through the fifth portion 85, it removes heat from the high temperature reducing agent injector 68 to cool the reducing agent injector 68 and prevent its overheating. . Thereafter, the engine coolant water (higher in temperature than the reducing agent) which has received a supply of heat and which is at a relatively high temperature, flows through the portion 85 a along the reducing agent pipe 69 and the reducing agent in the reducing agent pipe 69 Supply heat to When the reducing agent injection device 68 is in the low temperature state, the engine coolant water having a temperature higher than that of the low temperature state reducing agent injection device 68 flows through the fifth portion 85 and the reducing agent injection device 68 and the reducing agent inside thereof Supply heat to After that, the engine cooling water, which has reached a relatively low temperature after the heat supply in the portion 85a, merges with the engine cooling water flowing through the third portion 83, and then passes through the fourth portion 84 to form a heat exchanger unit. It reaches to 13.

  In this manner, the heat supply function supplies heat to the reducing agent tank 20, the reducing agent pipe 69, the supply module SM, and the reducing agent injection device 68 by using the engine cooling water, and the reducing agent in them is provided. Prevent freezing or dissolve frozen reductant.

  Next, a specific arrangement configuration of the reducing agent pipe 69 which is a feature of the shovel of the present embodiment will be described based on the drawings.

  FIG. 4 is a partially enlarged cross-sectional view showing an example in which the reducing agent pipe 69 is disposed along the outer wall surface of the shielding wall 17 outside the accommodation space S1 of the hydraulic oil tank 18. FIG. 4 is a partial longitudinal sectional view seen from the front side (arrow X1 side) of FIG.

  As illustrated, the reducing agent pipe 69 is disposed at a position along the outer wall surface (arrow Y1 side) of the shielding wall 17. That is, it is disposed at a position thermally separated from the hydraulic oil tank 18 which is a heating element. Therefore, it is possible to prevent the temperature of the reducing agent in the reducing agent pipe 69 from receiving heat from the heating element and raising the temperature.

  The outer peripheral portion of the reducing agent pipe 69 is protected by a protection member 50 provided on the outer surface (arrow Y1 side) of the shielding wall 17 facing the hydraulic oil tank 18. That is, the reducing agent pipe 69 is separately disposed in the separated space formed by the shielding wall 17 and the protective member 50. The protection member 50 in the illustrated example is a tubular member, and one side thereof is connected to the shielding wall 17. Preferably, the protective member 50 is formed with an opening 50a communicating with the outside air. This is to prevent the temperature in the separated space in which the reducing agent pipe 69 is accommodated from rising. Although the openings 50a in the illustrated example are through holes, they may be meshes, round holes, long holes (slits), etc. Moreover, the installation location of the opening 50a is not limited, It may be any of an upper surface, a side surface, and a lower surface, and the number is also not limited. However, the opening 50a is not an essential component and may not be provided.

  The reducing agent pipe 69 of the present embodiment is disposed so as to be at a height H2 above the height H1 of the boom frame 14 (14R). As a result, accessibility is improved at the time of maintenance of the reducing agent pipe 69, and work efficiency is improved.

Next, a second embodiment will be described based on FIG. This embodiment is based on the technical idea substantially the same as that of the first embodiment, and the difference will be mainly described.
FIG. 5 is a partially enlarged cross-sectional view showing an example in which the reducing agent pipe 69 is disposed outside the accommodation space S2 of the control valve 15 and along the outer wall surface of the shielding wall 16. FIG. 5 is a partial longitudinal sectional view seen from the front side (arrow X1 side) of FIG.

  In the shovel of the second embodiment, as shown in the drawing, the shielding wall 16 is installed in the vicinity of the side of the control valve 15 on the hydraulic oil tank 18 side or the arrow Y 2 side. The shielding wall 16 is disposed at a predetermined distance from the control valve 15, and forms a housing space S2 for housing the control valve 15. In the case of this embodiment, the above-mentioned shielding wall 17 is not essential.

  The reducing agent piping 69 is disposed at a position along the outer wall surface (arrow Y 2 side) of the shielding wall 16 and is thermally separated from the control valve 15 which is a heating element. Therefore, it is possible to prevent the temperature of the reducing agent in the reducing agent pipe 69 from receiving heat from the heating element and raising the temperature.

  The reducing agent pipe 69 is configured such that the outer peripheral portion is protected by a protective member 50 provided on the outer peripheral surface side of the shielding wall 16 facing the control valve 15. That is, the reducing agent pipe 69 is separately routed in the separated space formed by the shielding wall 16 and the protective member 50. The protection member 50 in the illustrated example is a tubular member as in FIG. 4 and has a configuration in which one side surface is connected to the shielding wall 16. In addition, it is preferable that an opening 50a communicating with the outside air be formed in the protective member 50.

  Further, also in the embodiment shown in FIG. 5, the reducing agent pipe 69 is disposed at the position of the height H3 above the height H1 of the boom frame 14 (14L).

  The height H2 of FIG. 4 is preferably higher than the height H3 of FIG. Then, since the reducing agent piping 69 is disposed at a position near the top cover 21B, the accessibility is significantly improved at the time of maintenance.

  The two types of routing patterns described with reference to FIGS. 4 and 5 can selectively implement one or both of the two according to the configuration of the upper swing body 2 and the arrangement of each device.

  As described above, the shovels according to the first and second embodiments are disposed along the outer wall surface of the shielding wall 17 or 16 outside the accommodation space S1 or S2 of the hydraulic oil tank 18 or the control valve 15 Configuration. Therefore, it can be disposed at a position thermally separated from the heat generating body, and it is possible to prevent the temperature rising due to the heat receiving of the reducing agent in the reducing agent piping 69 from the heat generating body. In this way, the quality of the reductant can be maintained to maintain high exhaust gas treatment capacity.

  Further, the reducing agent piping 69 is not only disposed on the outer wall surface of the shielding wall 17 or 16, but also has a construction arranged to be at a height above the height of the boom frame 14 (14R). is there. Therefore, the accessibility and the work efficiency at the time of maintenance are improved.

  Furthermore, since the reducing agent piping 69 is independently routed in the separated space formed by the shielding wall 17 (or 16) and the protective member 50, there is a possibility that it may be damaged and damaged during maintenance of other parts. It can be minimized.

  Next, a shovel according to a third embodiment of the present invention will be described from FIG. The present embodiment is based on a technical idea substantially similar to that of the first embodiment, and the difference will be mainly described below. The top view of upper revolving super structure 2 'which comprises the shovel concerning 3rd Embodiment in FIG. 6 was shown.

  The upper swirling body 2 'shown in FIG. 6 is the arrangement position of the hydraulic oil tank 180, the diesel engine 800, the cooling fan 120, the heat exchanger unit 130 as a heat radiating body, the exhaust gas processing device 100, the air filter 90a, etc. 2 and the left and right (arrow Y1 side, Y2 side) are arranged to be opposite.

  Therefore, the hydraulic oil tank 180 and the exhaust gas processing device 100 to which the reducing agent is supplied are disposed on the left side (arrow Y1 side), and the cooling fan 120, the heat exchanger unit 130, and the air filter 90a are disposed on the right side (arrow Y2 side). It is done.

  Although the reducing agent tank 200 is connected to the exhaust gas processing device 100 via the reducing agent pipe 690 and the reducing agent supply pump NP 2, the reducing agent supply pump NP 2 is in the vicinity of the reducing agent tank 200. The point and the arrangement configuration of the reducing agent pipe 690 are different from those in FIG. The configuration of the plan will be described later.

  A shielding wall 160 for blocking the heat from the hydraulic oil tank 180 is installed at a position near the side of the inner side (boom 40 side or arrow X1 side) of the diesel engine 800 disposed in the engine room 70. . Moreover, the shielding wall 160 is continuously provided also in the vicinity of one side surface of the heat exchanger unit 130 inner side (arrow Y 1 side). That is, the shielding wall 160 is disposed in a shape in which the plan view is bent in an L shape.

  The shield wall 160 is disposed at a predetermined distance from the diesel engine 800 and the heat exchanger unit 130 to form a storage space S3 for storing both devices. The shielding wall 160 in the illustrated example is bent in an L shape in a plan view, but is not limited to this, and the design may be appropriately changed depending on the arrangement of devices. The upper surface of the diesel engine 800 is covered with an engine cover 210A, and the upper surface of the heat exchanger unit 130 is covered with a heat exchanger cover 210C, and a housing space S3 is formed by combination with the shielding wall 160. Further, the top surfaces of the hydraulic oil tank 180 and the control valve 150 are covered by the top cover 210B.

  As described above, the upper slewing body 2 'of the present embodiment has the reducing agent tank 200 on the right side (arrow Y2 side), and the exhaust gas processing device 100 to which the reducing agent is supplied on the left side (arrow Y1 side) Therefore, the reducing agent pipe 690 is longer than the first embodiment, and an effective arrangement capable of preventing a temperature rise due to heat reception is required.

  Next, a specific arrangement configuration of the reducing agent pipe 690 constituting the features of the shovel according to the third embodiment will be described.

  FIG. 7 is an enlarged side view showing the arrangement of the reducing agent pipe 690 around the diesel engine 80. As shown in FIG. Further, FIG. 7 is a sectional view taken along the line II-II in FIG. FIG. 8 is an enlarged side view showing the arrangement of the reducing agent pipe 690 around the heat exchanger unit 130. As shown in FIG. Further, FIG. 8 is a cross-sectional view taken along the line III-III in FIG.

  After the reducing agent pipe 690 of the third embodiment is extended rearward along the inner wall surface of the fuel tank 190 from the reducing agent tank 200 through the reducing agent supply pump NP2 as shown in FIG. It has a routing configuration extending along the outer wall surface of an L-shaped shield wall 160 disposed near the unit 130 and the diesel engine 800. This arrangement configuration is disposed at a position separated thermally (see FIG. 8) from the heat exchanger unit 130 which is a radiator (see FIG. 8) and thermally separated from the diesel engine 800 which is a heating element (see FIG. 7). Means that Therefore, the temperature of the reducing agent in the reducing agent pipe 690 can be prevented from rising due to heat reception from the heat generating body and the heat radiating body.

  The reducing agent pipe 690 extends to the inside of the shielding wall 160 through a through hole or the like provided in the shielding wall 160 when the position of the shielding wall 160 exceeds the position of the diesel engine 800, and It is connected (see FIG. 6).

  The shielding wall 160 around the diesel engine 80 is provided in such a manner as to form a space N1 in which the reducing agent pipe 690 can be inserted, as shown in FIG. 7, inward of the accommodation space S3. That is, the shielding wall 160 is perpendicular to the horizontal portion 160A extending perpendicularly to the horizontal direction from the lower end of the front side surface portion 210Aa (arrow X1 side) of the engine cover 210A, and perpendicular to the vertical direction from the horizontal portion 160A. And a vertical portion 160B. The horizontal portion 160A can extend inwardly of the accommodation space S3 to form a space N1 capable of accommodating the reducing agent pipe 690 inwardly of the accommodation space S3. The lower surface of the space N1 may be formed by the top cover 210B.

  The reducing agent pipe 690 arranged in the space N1 on the outer surface of the shielding wall 160 configured as described above is configured to be protected by the protective member 500. The protection member 500 of the illustrated example is a plate extending in the vertical direction from the lower end portion of the front side surface portion 210Aa, and is disposed so as to be flush with the front side surface portion 210Aa. Therefore, since it looks good and has no extra bumps, it can contribute to the safety of the work.

  Preferably, the protective member 500 is formed with an opening 500a communicating with the outside air. This is to prevent the temperature in the separated space in which the reducing agent pipe 690 is accommodated from rising. The openings 500a in the illustrated example are through holes, but may be mesh, round holes, long holes (slits) or the like without being limited to this. Further, the installation location of the openings 500a is not limited, and may be any of the upper surface, the side surface, and the lower surface, and the number is not limited. However, the opening 500a is not an essential component and may not be provided.

  Further, the reducing agent pipe 690 is disposed so as to be located at a height H4 above the height H1 of the boom frame 140. Also, the height H4 is higher than the top cover 210B. As a result, accessibility during maintenance of the reducing agent pipe 690 is improved, and work efficiency is improved.

  FIG. 8 is an enlarged side view showing the arrangement of the reducing agent pipe 690 around the heat exchanger unit 130. As shown in FIG.

  The shielding wall 160 around the heat exchanger unit 130 is basically the same as FIG. 7 as shown in FIG. 8, and forms a space N2 through which the reducing agent pipe 690 can be inserted toward the inside of the accommodation space S3. It is provided in a manner. That is, the shielding wall 160 extends horizontally perpendicular to the horizontal direction from the lower end of the inner side surface 210Ca (arrow Y1 side) of the heat exchanger cover 210C (horizontally from the horizontal portion 160A). And a vertical portion 160B. The horizontal portion 160A can extend inwardly of the accommodation space S3 to form a space N2 that can accommodate the reducing agent pipe 690 toward the inside of the accommodation space S3. The lower surface of the space N2 may be formed by the top cover 210B.

  The outer peripheral portion of the reducing agent pipe 690 arranged in the space N2 which is the outer surface of the shielding wall 160 configured as described above is protected by the protective member 500. The protection member 500 of the illustrated example is a plate extending in the vertical direction from the lower end portion of the inner side surface portion 210Ca, and is disposed so as to be flush with the inner side surface portion 210Ca. Preferably, the protective member 500 is formed with an opening 500a communicating with the outside air.

  Further, the reducing agent pipe 690 is disposed at a height H5 above the height H1 of the boom frame 140 (140R). Also, the height H5 is higher than the top cover 210B. This can improve the work efficiency at the time of maintenance.

Next, a fourth embodiment will be described from FIG.
The reducing agent pipe 69 shown in FIG. 3 is integrally bundled with the third portion 83 of the cooling water hose 80 as a pipe for warming up, and the outer peripheral surface thereof is covered with the heat insulating material 90.

  However, as shown in FIG. 9, the warming-up wiring 40 may be disposed along the reducing agent pipe 69 'extending from the reducing agent tank 20'. The wire 40 is a nichrome wire or the like, and transfers heat from a heat source (not shown). The wiring 40 is wound along the axial direction of the reducing agent pipe 69 '. Therefore, "wiring is routed along the reducing agent pipe" described in the claims means that the wiring 40 is wound along the axial direction of the reducing agent pipe 69 '.

  It is preferable that the reducing agent pipe 69 'in which the wiring 40 is integrally wound as described above has a configuration in which the outer peripheral surface is covered with the heat insulating material 90'.

  Although the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to the specific embodiments described above, and various modifications may be made within the scope of the present invention as set forth in the appended claims. Modifications, changes, etc. are possible.

  For example, as the configuration of the shielding wall and the protection member, either of the form described in FIGS. 4 and 5 or the form described in FIGS. 7 and 8 may be applied.

1 Lower body
2 upper swing body
3 cab
4 boom
5 arm 6 bucket 7 engine room
8 diesel engine
9a Air filter
9b Intake pipe
9c Exhaust pipe
10 Exhaust gas treatment system
12 Cooling fan 13 Heat exchanger unit 14 Boom frame 15 Control valve 16, 17 Shielding wall 18 Hydraulic oil tank
19 fuel tank
20 reductant tank
21 House Cover 21A Engine Cover 21B Top Cover 210C Heat Exchanger Cover 22 Counter Weight 50 Protective Member 50a Opening 60 Engine Control Module
61 Turbocharger
65 Intercooler
66 Diesel particulate filter
67 Selective reduction catalyst
68 Reductant injection device
69 reductant piping 71 filter
72, 73 NOx sensor
74 Reductant remaining amount sensor
75 Exhaust gas controller
76 Excavator Controller
77 Monitor
80 cooling water hose
81 first part
82 second part
83 third part
84 fourth part
85 fifth part
90 Thermal insulation NP reductant supply pump

Claims (8)

An exhaust gas treatment device for purifying exhaust gas;
A reducing agent tank in which a reducing agent for processing the exhaust gas is stored;
Reducing agent piping for supplying the reducing agent of the reducing agent tank to the exhaust gas treatment device;
A heating element and / or a radiator
A shielding wall forming a housing space for housing the heat generating body and / or the heat radiating body;
A shovel having
The shovel, wherein the reducing agent pipe is disposed outside the accommodation space and along a separated space in which the reducing agent pipe of which the shielding wall forms a part is independently accommodated .   The shovel according to claim 1, wherein the reducing agent pipe is protected by a protective member provided on a side surface facing the heat generating body and / or the heat radiating body.   The shovel according to claim 2, wherein an opening communicating with the outside air is formed in the protective member. Has piping or wiring for warm-up,
The piping or the wiring is routed along the reducing agent piping,
The shovel according to claim 1, wherein the reducing agent pipe and the pipe, or the reducing agent pipe and the wiring are both covered with a heat insulating material. Upper swing body,
A support frame for supporting a boom provided on one side of the upper swing body,
The shovel according to any one of claims 1 to 4, wherein the reducing agent pipe is disposed above the support frame.   The shovel according to claim 1, wherein the heating element is at least one of an engine, a hydraulic oil tank, and a control valve.   The shovel according to claim 1, wherein the radiator is a heat exchanger.   The shovel according to any one of claims 1 to 3, wherein the reducing agent pipe is disposed integrally with the warming-up pipe or wiring in the separated space which independently accommodates the reducing agent pipe.

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