JP2017061794A - Shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shovel capable of achieving high efficiency of maintenance work with prevention of temperature rise of a reductant by heat received.SOLUTION: A shovel includes an exhaust gas treatment device which purifies exhaust gas, a reductant tank which stores a reductant for treating exhaust gas, a reductant piping which supplies the reductant in the reductant tank to the exhaust gas treatment device, a heating unit and/or a radiator, and a shield wall which forms a storage space for storing the heating unit or the radiator. The reductant piping is disposed outside the storage space, along the shield wall.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an excavator equipped with an exhaust gas treatment device.

  In recent years, construction machinery such as hydraulic excavators equipped with a diesel engine has been installed with an exhaust gas treatment device in the exhaust system of the diesel engine in order to comply with higher exhaust gas regulations. Through the NOx reduction catalyst provided on the downstream side of the catalyst. As the above-described exhaust gas treatment device, a selective reduction type NOx treatment device using a reducing agent solution (liquid reducing agent) is often used. An example of an excavator equipped with such an exhaust gas treatment device is shown in FIG.

  The shovel shown 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 21 </ b> A and a top cover 21 </ b> B is installed on the upper part of the upper swing body 2, and an engine room 7 is formed inside. In the engine room 7, the above-described exhaust gas treatment device 10 is disposed together with the diesel engine 8, the cooling fan 12, and the heat exchanger unit 13. A reductant 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 processing device 10 via a reducing agent pipe NH and a reducing agent supply pump NP. The exhaust gas treatment device 10 injects a reducing agent upstream of a reduction catalyst (not shown) provided in the exhaust pipe 9c to reduce NOx in the exhaust gas, and this reduction reaction is promoted by the reduction catalyst. Thus, the NOx is made harmless.

  In the excavator having the above-described configuration, the reducing agent pipe NH connected to the reducing agent tank 20 (urea water tank) is rearward along the right boom frame 14R that supports the boom 4 disposed inside the top cover 21B ( It extends to the arrow X2 side) and is arranged so as to be inserted into the gap between the hydraulic oil tank 18 and the control valve 15.

  Also, in the excavator equipped with the exhaust gas treatment device disclosed in Patent Document 1, the reducing agent pipe connected to the reducing agent tank is routed inside the house cover where the engine, the heat exchanger, and the control valve are installed. Has been.

JP 2010-261373 A

  By the way, if the reducing agent is heated to a high temperature before being injected into the exhaust pipe, the components are thermally decomposed and changed into ammonia, and therefore there is a possibility that an appropriate reduction reaction cannot be obtained when mixed with the exhaust gas. is there. Therefore, it is necessary to consider that the temperature of the reducing agent does not increase as much as possible.

  However, the above-described conventional excavator has a configuration in which the reducing agent pipe is arranged inside the house cover. Furthermore, since the configuration is arranged around equipment that becomes high temperature, such as an engine, a heat exchanger, and a control valve, the reducing agent is in a state where the temperature is likely to rise due to heat from the high temperature equipment.

  In short, an excavator equipped with a conventional exhaust gas treatment device was not configured to prevent the temperature of the reducing agent from rising.

  Moreover, since the reducing agent piping is arranged inside the house cover, there is a problem that maintenance work becomes very troublesome.

  One object of the present embodiment is to provide an excavator that can prevent a temperature rise due to heat received by a reducing agent and realize efficiency of maintenance work in view of the above problems.

An excavator 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 treating the exhaust gas is stored;
A reducing agent pipe for supplying the reducing agent in 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 heating element and / or the heat radiating body;
An excavator having
The reducing agent pipe is disposed outside the housing space and along the shielding wall.

  By the above-mentioned means, a shovel that can prevent the temperature rise due to the heat received by the reducing agent and realize the efficiency of the maintenance work is provided.

It is a side view of an excavator. It is a top view which shows roughly the upper revolving body of the shovel of 1st Embodiment. It is a figure which shows the structural example of the exhaust-gas processing apparatus mounted in the shovel of FIG. It is an enlarged side view which shows the arrangement state of the reducing agent piping in the hydraulic oil tank periphery. It is an enlarged side view which shows the arrangement | positioning state of the reducing agent piping in the control valve periphery. It is a top view which shows roughly the upper revolving body of the excavator of 3rd Embodiment. It is an enlarged side view which shows the arrangement state of the reducing agent piping in the diesel engine periphery. It is an enlarged side view which shows the arrangement | positioning state of the reducing agent piping in the heat exchanger unit periphery. It is the elements on larger scale which show the wiring relationship between the wiring for warming up, and reducing agent piping. It is a top view which shows schematically the upper revolving body of the conventional shovel.

  Next, non-limiting embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same or corresponding reference numerals are assigned to the same or corresponding members or parts. In the following, duplicate descriptions of the same or corresponding members or parts are omitted. Also, the drawings are not intended to show 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 are illustrative rather than limiting the invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is a side view of an excavator that is an example of a construction machine according to a first embodiment of the present invention. The excavator is mounted on the lower traveling body 1 so that the upper swing body 2 can swing, and a cab 3 is provided on the left front side of the upper swing body 2. In addition, the boom 4 is rotatably connected to the front center portion of the upper swing body 2, and the arm 5 is rotatably connected to the tip of the boom 4. Further, a bucket 6 is rotatably connected to the tip of the arm 5.

  Here, in this 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. Further, the left side is a portion which becomes the left when facing the front (the direction in which the boom 4 extends) in the upper swing body 2. Further, the right side is a portion which becomes the right when facing the front (the direction in which the boom 4 extends) in the upper swing body 2.

  FIG. 2 is a plan view schematically showing the upper swing body 2. As shown in FIG. 2, the boom 4 is rotatably supported in the vicinity of the center on 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 that is firmly fixed to the front center position of the upper swing body 2. More specifically, the boom foot pin is provided through the right frame 14R, the boom 4, and the left frame 14L while being sandwiched between the right frame 14R and the left frame 14L of the boom frame 14. 400.

  An engine room 7 is formed in the upper swing body 2, and a diesel engine 8 as a heating element is installed in the engine room 7. 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 or the like is installed on the Y1 side of the cooling fan 12.

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

  In the present embodiment, the exhaust gas treatment device 10 is a selective reduction type NOx treatment device using a reducing agent such as urea water. The exhaust gas treatment device 10 injects a reducing agent upstream of a reduction catalyst (not shown) provided in the exhaust pipe 9c to reduce NOx in the exhaust gas, and this reduction reaction is promoted by the reduction catalyst. To detoxify 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. A fuel tank 19 is disposed behind the reducing agent tank 20 (X2 side), and a hydraulic oil tank 18 serving as a heating element is disposed behind the fuel tank 19 (X2 side). Further, 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 that blocks heat from the hydraulic oil tank 18 is installed on the side surface of the hydraulic oil tank 18 on the inner side (arrow Y1 side). The shielding wall 17 is arranged at a predetermined interval from the hydraulic oil tank 18. Reference sign S <b> 1 is a space between the shielding wall 17 and the hydraulic oil tank 18. The symbol S1 is a storage space for storing the hydraulic oil tank 18 (hereinafter referred to as a storage space S1). Further, an upper surface cover (dotted line) may be provided above the hydraulic oil tank 18 to form a sealed space (S1) with the upper surface cover and the shielding wall 17 (see FIG. 3). However, the top cover is not necessarily provided.

  The reducing agent tank 20 is connected to the exhaust gas processing device 10 via a reducing agent pipe 69 and a reducing agent supply pump NP. Moreover, the reducing agent pipe | tube 69 may be comprised so that connection and isolation | separation can be performed by one or several joint parts.

  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 with a house cover 21. The house cover 21 has an engine cover 21A that covers at least the upper surface of the engine room 7, and a top cover 21B that covers the upper surface of the control valve 15 and the upper surfaces of the rear ends of the boom frames 14R and 14L.
A counterweight 22 is provided at the rear end (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 pipe 69 is disposed at a position that is thermally separated from the control valve 15 and the hydraulic oil tank 18 as a heating element, so that the reducing agent in the pipe 69 is received by heat received from the heating element. It is the structure which prevents that temperature rises.
FIG. 3 is a schematic diagram showing a configuration example of the exhaust gas processing apparatus 10. In the present embodiment, the exhaust gas treatment 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 is supplied to the diesel engine 8 through the turbocharger 61, the intercooler 65, and the like. Then, the exhaust gas from the diesel engine 8 passes through the turbocharger 61, reaches the exhaust pipe 9c downstream thereof, is purified by the exhaust gas processing device 10, and is discharged into the atmosphere.

  In the exhaust pipe 9c, a diesel particulate filter 66 that collects particulate matter in the exhaust gas and a selective reduction catalyst 67 that reduces and removes NOx in the exhaust gas are provided in series.

  The selective reduction catalyst 67 receives the supply of the reducing 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 upstream 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.

  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 a 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. This ammonia reduces NOx contained in the exhaust gas in the selective reduction catalyst 67. In this way, exhaust gas purification is performed.

  The first NOx sensor 72 and the second NOx sensor 73 are sensors that detect the NOx concentration in the exhaust gas. In the present embodiment, the first NOx sensor 72 is disposed on the upstream side of the reducing agent injection device 68, and the second NOx sensor 73 is disposed on the downstream side 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 in the upper part of 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 concentrations detected by the first NOx sensor 72 and the second NOx sensor 73, respectively, so that an appropriate amount of reducing agent is injected. Like that.

  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 reducing agent remaining amount to the entire volume of the reducing agent tank 20 is defined as the reducing agent remaining amount ratio. For example, the reducing agent remaining amount ratio of 50% represents that the reducing agent half of the capacity of the reducing agent tank 20 remains in the reducing agent tank 20.

  The exhaust gas controller 75 is connected to the ECM 60 via communication means. The ECM 60 is connected to an excavator controller 76 via communication means, and the excavator controller 76 is connected to a monitor 77 (display device) via communication means. The monitor 77 displays warnings, operating conditions, and the like.

  Various types of information related to the exhaust gas processing device 10 included in the exhaust gas controller 75 can be shared by the shovel controller 76. The ECM 60, the exhaust gas controller 75, and the excavator controller 76 are arithmetic devices each including a CPU, a RAM, a ROM, an input / output port, a storage device, and the like.

  Further, the exhaust gas treatment device 10 has a heat supply function for supplying heat to the reducing agent tank 20 and the reducing agent pipe 69. The heat supply function is executed, for example, to prevent freezing of the reducing agent in a cold region or to dissolve the frozen reducing agent. In this embodiment, engine coolant (for example, long life coolant) of the diesel engine 8 that passes through the coolant hose 80 is used.

  Specifically, the engine coolant immediately after cooling the diesel engine 8 reaches the second portion 82 through the first portion 81 of the coolant hose 80 while maintaining a relatively high temperature. The second portion 82 is a part of the cooling water hose 80 that contacts the outer surface of the reducing agent tank 20. When the engine cooling water having a temperature higher than that of the reducing agent flows through the second portion 82, heat is supplied to the reducing agent tank 20 and the reducing agent in the inside thereof.

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

  Further, the third portion 83 and the reducing agent pipe 69 of the cooling water hose 80 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 or foam (sponge). Therefore, the heat insulation effect by securing the air layer can be obtained.

  Thereafter, the engine cooling water that has reached a relatively low temperature after finishing the supply of heat in the second part 82 and the third part 83 passes through the fourth part 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 routed between the third portion 83 and the fifth portion 85 and the heat exchanger unit 13, and does not adhere to the reducing agent pipe 69.

  The fifth portion 85 is a part of the cooling water hose 80 used for cooling the reducing agent injection device 68. When the engine coolant having a temperature lower than that of the reducing agent injection device 68 in the high temperature state flows through the fifth portion 85, it takes heat from the reducing agent injection device 68 in the high temperature state and cools the reducing agent injection device 68 to prevent overheating. . Thereafter, when the engine cooling water that has been supplied with heat and has a relatively high temperature (higher than the reducing agent) flows through the portion 85 a along the reducing agent pipe 69, the reducing agent pipe 69 and the reducing agent in the inside thereof. To supply heat. When the reducing agent injection device 68 is in a low temperature state, when the engine coolant having a temperature higher than that of the reducing agent injection device 68 in the low temperature state flows through the fifth portion 85, the reducing agent injection device 68 and the reducing agent in the inside thereof. To supply heat. Thereafter, the engine cooling water that has reached a relatively low temperature after finishing the supply of heat in the portion 85 a merges with the engine cooling water that has flowed through the third portion 83, and then passes through the fourth portion 84 to form a heat exchanger unit. 13 is reached.

  In this way, the heat supply function supplies the heat to the reducing agent tank 20, the reducing agent pipe 69, the supply module SM, and the reducing agent injection device 68 using the engine cooling water, and the reducing agent inside them. Is prevented from being frozen, or the frozen reducing agent is dissolved.

  Next, a specific arrangement configuration of the reducing agent pipe 69 constituting the features 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 outside the accommodation space S1 of the hydraulic oil tank 18 and along the outer wall surface of the shielding wall 17. 4 is a partial longitudinal sectional view as 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 arranged at a position thermally separated from the hydraulic oil tank 18 which is a heating element. Therefore, it is possible to prevent the reducing agent in the reducing agent pipe 69 from receiving heat from the heating element and increasing the temperature.

  The reducing agent pipe 69 is configured such that its outer peripheral portion is protected by a protective 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 routed alone in the space formed by the shielding wall 17 and the protection member 50. The protection member 50 in the illustrated example is a tubular member, and one side surface is connected to the shielding wall 17. The protective member 50 is preferably formed with an opening 50a communicating with the outside air. This is to prevent the temperature in the separation space in which the reducing agent pipe 69 is accommodated from rising. The opening 50a in the illustrated example is a through hole, but is not limited thereto, and may be a mesh, a round hole, a long hole (slit), or the like. Moreover, the installation location of the opening 50a is not limited, and may be any of an upper surface, a side surface, and a lower surface, and the number is not limited. However, the opening 50a is not an essential constituent requirement and may not be provided.

  The reducing agent pipe 69 of the present embodiment is arranged so as to be at a position where the height H2 is higher than the height H1 of the boom frame 14 (14R). As a result, the accessibility of the reducing agent pipe 69 is improved and the working efficiency is improved.

Next, a second embodiment will be described based on FIG. The present 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 as seen from the front side (arrow X1 side) of FIG.

  In the shovel of the second embodiment, a shielding wall 16 is installed in the vicinity of the side surface of the control valve 15 on the hydraulic oil tank 18 side or the arrow Y2 side as shown in the figure. The shielding wall 16 is disposed at a predetermined distance from the control valve 15 and forms an accommodation space S <b> 2 for accommodating the control valve 15. In the case of this embodiment, the aforementioned shielding wall 17 is not essential.

  The reducing agent pipe 69 is disposed at a position along the outer wall surface (arrow Y2 side) of the shielding wall 16 and is thermally separated from the control valve 15 that is a heating element. Therefore, it is possible to prevent the reducing agent in the reducing agent pipe 69 from receiving heat from the heating element and increasing the temperature.

  The reducing agent pipe 69 is configured such that the outer peripheral portion thereof is protected by a protective member 50 provided on the outer peripheral surface side of the shielding wall 16 facing the control valve 15. In other words, the reducing agent pipe 69 is routed independently in the separation space formed by the shielding wall 16 and the protection member 50. The protective member 50 in the illustrated example is a tubular member as in FIG. 4, and one side surface is connected to the shielding wall 16. The protective member 50 is preferably formed with an opening 50a communicating with the outside air.

  In the embodiment shown in FIG. 5 as well, the reducing agent pipe 69 is arranged so as to have a height H3 higher than the height H1 of the boom frame 14 (14L).

  The height H2 in FIG. 4 is preferably higher than the height H3 in FIG. Then, since the reducing agent pipe 69 is routed near the top cover 21B, the accessibility is greatly improved during maintenance.

  Note that the two types of arrangement patterns described with reference to FIGS. 4 and 5 can be selectively performed according to the configuration of the upper swing body 2 and the arrangement status of each device.

  As described above, the excavator according to the first and second embodiments is disposed outside the accommodating space S1 or S2 of the hydraulic oil tank 18 or the control valve 15 and along the outer wall surface of the shielding wall 17 or 16. The configuration is as follows. Therefore, it can arrange | position in the position thermally separated from the heat generating body, and it can prevent that the reducing agent in the reducing agent piping 69 receives from a heat generating body, and temperature rises. Thus, the quality of the reducing agent can be maintained and high exhaust gas treatment capacity can be maintained.

  In addition, the reducing agent pipe 69 is arranged not only on the outer wall surface of the shielding wall 17 or 16 but also arranged so as to be at a position higher than the height of the boom frame 14 (14R). is there. Therefore, accessibility and work efficiency during maintenance are improved.

  Furthermore, since the reducing agent pipe 69 is individually arranged in the space formed by the shielding wall 17 (or 16) and the protection member 50, there is a possibility that the reducing agent pipe 69 may be damaged due to an obstacle during maintenance of other parts. Can be minimized.

  Next, an excavator according to a third embodiment of the present invention will be described with reference to FIG. The present embodiment is based on the technical idea substantially the same as that of the first embodiment, and the difference will be mainly described below. FIG. 6 shows a plan view of the upper swing body 2 ′ constituting the excavator according to the third embodiment.

  The upper swivel body 2 ′ shown in FIG. 6 has the arrangement positions of the hydraulic oil tank 180, the diesel engine 800, the cooling fan 120, the heat exchanger unit 130 as a radiator, the exhaust gas treatment device 100, the air filter 90a, and the like. 2 and left and right (arrow Y1 side, Y2 side) are arranged opposite to each other.

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

  The reducing agent tank 200 is the same in that it is connected to the exhaust gas processing device 100 via the reducing agent pipe 690 and the reducing agent supply pump NP2, but the reducing agent supply pump NP2 is in the vicinity of the reducing agent tank 200. The arrangement of the point and the reducing agent pipe 690 is different from that shown in FIG. The routing configuration will be described later.

  A shielding wall 160 that blocks heat from the hydraulic oil tank 180 is installed in the vicinity of the inner side surface (boom 40 side or arrow X1 side) of the diesel engine 800 disposed in the engine room 70. . Further, the shielding wall 160 is also continuously provided in the vicinity of one side surface of the heat exchanger unit 130 on the inner side (arrow Y1 side). That is, the shielding wall 160 is arranged in a shape that is bent in an L shape in plan view.

  The shielding wall 160 is disposed at a predetermined interval from the diesel engine 800 and the heat exchanger unit 130 to form a housing space S3 that houses both devices. Although the shielding wall 160 in the illustrated example is bent in an L shape in plan view, the design is appropriately changed depending on the arrangement of the devices without being limited to this. The upper surface of the diesel engine 800 is covered with an engine cover 210 </ b> A, and the upper surface of the heat exchanger unit 130 is covered with a heat exchanger cover 210 </ b> C, and an accommodation space S <b> 3 is formed by a combination with the shielding wall 160. Further, the upper surfaces of the hydraulic oil tank 180 and the control valve 150 are covered with a top cover 210B.

  As described above, the upper swing body 2 ′ of the present embodiment has the reducing agent tank 200 on the right side (arrow Y2 side) and the exhaust gas treatment 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 that of the first embodiment, and an effective arrangement that can prevent 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 excavator according to the third embodiment will be described.

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

  As shown in FIG. 6, the reducing agent pipe 690 of the third embodiment extends from the reducing agent tank 200 to the rear side along the inner wall surface of the fuel tank 190 via the reducing agent supply pump NP <b> 2, and then the heat exchanger. The arrangement structure extends along the outer wall surface of the L-shaped shielding wall 160 disposed in the vicinity of the unit 130 and the diesel engine 800. This arrangement configuration is arranged at a position that is thermally separated from the heat exchanger unit 130 that is a radiator (see FIG. 8) and is also thermally separated from the diesel engine 800 that is a heating element (see FIG. 7). Means that Therefore, it is possible to prevent the reducing agent in the reducing agent pipe 690 from receiving heat from the heating element and the heat radiating member and increasing the temperature.

  The reducing agent pipe 690 extends inward of the shielding wall 160 through a through-hole or the like provided in the shielding wall 160 at a position beyond the position of the diesel engine 800 on the shielding wall 160, and is connected to the exhaust gas processing device 100. Connected (see FIG. 6).

  As shown in FIG. 7, the shielding wall 160 around the diesel engine 80 is provided in such a manner that a space N1 into which the reducing agent pipe 690 can be inserted is formed toward the inside of the accommodation space S3. That is, the shielding wall 160 hangs down from the lower end portion of the front side surface portion 210Aa (arrow X1 side) of the engine cover 210A perpendicularly to the horizontal direction and from the horizontal portion 160A perpendicularly to the vertical direction. And a vertical portion 160B. The horizontal portion 160A extends toward the inside of the accommodation space S3, so that a space N1 that can accommodate the reducing agent pipe 690 can be formed toward the inside 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 N <b> 1 on the outer surface of the shielding wall 160 having the above-described configuration is configured to be protected by the protection member 500. The protection member 500 in the illustrated example is a plate that extends in the vertical direction from the lower end of the front side surface portion 210Aa, and is disposed so as to be flush with the front side surface portion 210Aa. Therefore, it looks good and there is no extra protrusion, which can contribute to work safety.

  The protective member 500 is preferably formed with an opening 500a communicating with the outside air. This is to prevent the temperature in the separation space in which the reducing agent pipe 690 is accommodated from rising. The opening 500a in the illustrated example is a through hole, but is not limited to this, and may be a mesh, a round hole, a long hole (slit), or the like. Moreover, the installation location of the opening 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 routed so as to be at a height H4 above the height H1 of the boom frame 140. The height H4 is higher than the top cover 210B. As a result, the accessibility of the reducing agent pipe 690 is improved and the working efficiency is improved.

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

  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 includes a horizontal portion 160A extending perpendicularly to the horizontal direction from the lower end portion of the inner side surface portion 210Ca (arrow Y1 side) of the heat exchanger cover 210C and a vertical portion perpendicular to the horizontal portion 160A. And a vertical portion 160B. The horizontal portion 160A extends toward the inside of the accommodation space S3, so that a space N2 that can accommodate the reducing agent pipe 690 can be formed toward the inside of the accommodation space S3. The lower surface of the space N2 may be formed by the top cover 210B.

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

  Further, the reducing agent pipe 690 is arranged so as to be at a position of a height H5 above the height H1 of the boom frame 140 (140R). Further, the height H5 is higher than that of the top cover 210B. Thereby, the work efficiency at the time of maintenance can be improved.

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

  However, as shown in FIG. 9, the warm-up wiring 40 may be arranged along the reducing agent pipe 69 ′ extending from the reducing agent tank 20 ′. The wiring 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 ′.

  As described above, the reducing agent pipe 69 ′ around which the wiring 40 is integrally wound preferably has a configuration in which the outer peripheral surface is covered with the heat insulating material 90 ′.

  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. Modifications, changes, etc. are possible.

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

1 Lower traveling 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 equipment
12 Cooling fan 13 Heat exchanger unit 14 Boom frame 15 Control valves 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 Counterweight 50 Protection member 50a Opening 60 Engine control module
61 Turbocharger
65 Intercooler
66 Diesel particulate filter
67 Selective reduction catalyst
68 Reducing agent injection device
69 Reducing agent piping 71 Filter
72, 73 NOx sensor
74 Reducing agent remaining amount sensor
75 Exhaust gas controller
76 excavator controller
77 Monitor
80 Cooling water hose
81 1st part
82 Second part
83 Third part
84 Fourth part
85 fifth part
90 Insulation NP Reducing agent supply pump

Claims (7)

An exhaust gas treatment device for purifying exhaust gas;
A reducing agent tank in which a reducing agent for treating the exhaust gas is stored;
A reducing agent pipe for supplying the reducing agent in the reducing agent tank to the exhaust gas treatment device;
A heating element and / or a radiator;
A shielding wall that forms a housing space for housing the heating element and / or the heat radiating body;
An excavator having
The reductant pipe is disposed outside the accommodation space and along the shielding wall.   The excavator 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 excavator according to claim 2, wherein an opening communicating with the outside air is formed in the protection member. It 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 both the reducing agent pipe and the pipe, or the reducing agent pipe and the wiring are covered with a heat insulating material. An upper swing body,
A support frame for supporting a boom provided on one side of the upper swing body;
The excavator according to any one of claims 1 to 4, wherein the reducing agent pipe is routed 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.

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