JP7430551B2 - construction machinery - Google Patents

Description

The present invention relates to construction machinery.

Patent Document 1 discloses a hydraulic excavator as a construction machine. In this hydraulic excavator, an engine and an aftertreatment device are mounted in the engine room of the upper revolving structure. Then, the after-treatment device performs after-treatment such as detoxifying the exhaust gas from the engine, and the after-treated exhaust gas is exhausted to the atmosphere. The engine and the aftertreatment device are connected via an exhaust pipe.

The after-treatment device of Patent Document 1 is provided with a diesel particulate filter (DPF). The after-treatment device collects particulate matter (PM) contained in the exhaust gas using a diesel particulate filter and removes the particulate matter from the exhaust gas. Do it as. Further, the hydraulic excavator is provided with a differential pressure sensor that detects the differential pressure before and after the process of removing particulate matter. Based on the detection result of the differential pressure sensor, clogging in the diesel particulate filter is detected.

International Publication No. 2008/136203

In the engine room of a construction machine like the one disclosed in Patent Document 1, the engine, exhaust pipe, etc. become hot due to heat generated by the engine. Therefore, it is required to reduce the influence of heat generated by the engine on the differential pressure sensor.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to reduce the amount of particulate matter generated in the engine in a configuration in which a differential pressure sensor is provided to detect the differential pressure before and after the process of removing particulate matter. An object of the present invention is to provide a construction machine in which the influence of heat on a differential pressure sensor is reduced.

In order to achieve the above object, a construction machine according to an aspect of the present invention includes: an undercarriage body; an upper revolving body connected vertically above the undercarriage body so as to be able to rotate with respect to the undercarriage body; An engine mounted on a revolving structure; and an after-treatment device mounted on the upper revolving structure, which after-processes exhaust gas from the engine and exhausts it to the atmosphere, which removes particulate matter contained in the exhaust gas. an aftertreatment device that performs at least a process of collecting and removing the particulate matter from the exhaust gas; an exhaust pipe that connects the engine and the aftertreatment device; A differential pressure sensor that detects a differential pressure before and after processing, the differential pressure sensor being arranged with the after-treatment device sandwiched between the exhaust pipe and the after-treatment device with a gap formed therebetween. a pedestal on which a post-processing device is installed vertically above the particulate matter; a first impulse pipe that guides the pressure before the process for removing the particulate matter to the differential pressure sensor; a second pressure impulse pipe that guides the pressure after the processing to the differential pressure sensor, the first pressure impulse pipe passing through the gap between the post-processing device and the pedestal; It will be extended .

According to the present invention, there is provided a construction machine in which the influence of heat generated by an engine on the differential pressure sensor is reduced in a configuration in which a differential pressure sensor that detects the differential pressure before and after a process for removing particulate matter is provided. can do.

FIG. 1 is a schematic diagram showing a hydraulic excavator according to a first embodiment. FIG. 2 is a schematic diagram showing the structure of the engine room and its vicinity in the upper revolving structure of the hydraulic excavator according to the first embodiment. FIG. 3 is a perspective view showing an engine, an aftertreatment device, and the configuration of their vicinity in the engine room of the hydraulic excavator according to the first embodiment. FIG. 4 is a perspective view showing a post-processing device, an exhaust pipe, a pedestal, and the configuration of their vicinity in the hydraulic excavator according to the first embodiment. FIG. 5 is a perspective view showing a post-processing device, a differential pressure sensor, and the configuration of their vicinity in the hydraulic excavator according to the first embodiment. FIG. 6 is a perspective view showing a post-processing device, a differential pressure sensor, and the configuration of their vicinity, as viewed from a direction different from that in FIG. 5, in the hydraulic excavator according to the first embodiment. FIG. 7 is a schematic diagram showing a post-processing device, a differential pressure sensor, and their vicinity as viewed from one side in the first horizontal direction in the hydraulic excavator according to the first embodiment. FIG. 8 is a schematic diagram showing a post-processing device, a differential pressure sensor, and their vicinity, as viewed from one side in the second horizontal direction, in the hydraulic excavator according to the first embodiment. FIG. 9 is a schematic diagram showing the configuration of a gap between the post-processing device and the pedestal in the hydraulic excavator according to the first embodiment.

Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 shows a hydraulic excavator 1 according to a first embodiment as an example of a construction machine. As shown in FIG. 1, the hydraulic excavator 1 includes a lower traveling body 2 and an upper revolving body 3. The upper revolving body 3 is connected to the vertically upper side of the lower traveling body 2 . The upper rotating body 3 is capable of turning with respect to the lower traveling body 2 around a turning axis that is parallel or substantially parallel to the vertical direction (directions shown by arrows Z1 and Z2).

In the upper revolving body 3, there is a front-rear direction (direction indicated by arrow X1 and arrow X2) that intersects with the vertical direction (vertical or approximately perpendicular), and a direction that intersects with both the vertical direction and the front-rear direction (perpendicular or approximately perpendicular). The width direction is defined. In FIG. 1, a direction perpendicular or substantially perpendicular to the plane of the paper coincides with or substantially coincides with the width direction (horizontal direction) of the upper revolving structure 3. In addition, for the undercarriage body 2, a front-back direction that intersects with the vertical direction (perpendicular or approximately perpendicular) and a width direction that intersects with both the vertical direction and the front-rear direction (perpendicular or approximately perpendicular) are defined. be done. In FIG. 1, the front-rear direction of the undercarriage 2 coincides with or substantially coincides with the longitudinal direction of the upper revolving structure 3, that is, the front side of the undercarriage 2 coincides with the front side of the upper revolving structure 3 (arrow X1 side). Alternatively, the hydraulic excavator 1 is shown in a substantially coincident state. Further, in FIG. 1, each of the lower traveling body 2 and the upper rotating body 3 is shown as viewed from one side in the width direction, that is, from the left side.

A working device 5 is connected to the upper revolving body 3 . The working device 5 rotates together with the upper rotating body 3 relative to the lower traveling body 2. The working device 5 includes a boom 6, an arm 7, and a bucket 8. The base end of the boom 6 is rotatably attached to the upper revolving body 3. When the boom 6 rotates with respect to the revolving upper structure 3, the boom 6 performs a raising operation or a lowering operation with respect to the revolving upper structure 3. The base end of the arm 7 is rotatably attached to the distal end of the boom 6. As the arm 7 rotates with respect to the boom 6, the arm 7 performs a raising operation or a lowering operation with respect to the boom 6. Bucket 8 is a type of attachment, and is removably attached to the tip of arm 7. By operating the boom 6, arm 7, and bucket 8, the hydraulic excavator 1 excavates earth and sand with the bucket 8.

The upper revolving body 3 includes a revolving table 11 and a driver's cab 12. The driver's cab 12 is installed on the turning table 11. The operator's cab 12 is arranged in line with the working device 5 in the width direction of the revolving upper structure 3. In the operator's cab 12, the hydraulic excavator 1 is operated by a worker. Further, in the upper revolving structure 3, an engine room 13 is formed on the rear side with respect to the driver's cab 12.

FIG. 2 shows the configuration of the engine room 13 and its vicinity in the upper revolving structure 3. FIG. 2 shows a state viewed from vertically above, and in FIG. 2, the direction indicated by arrow Y1 and arrow Y2 is the width direction of the upper revolving structure 3. As shown in FIG. 2, an engine 15 and an aftertreatment device 16 are arranged in the engine room 13. That is, the engine 15 and the aftertreatment device 16 are mounted in a region of the upper rotating structure 3 on the rear side of the driver's cab 12 . The engine 15 and the aftertreatment device 16 are arranged on the turning table 11. In the example of FIG. 2, the aftertreatment device 16 is arranged in line with the engine 15 on one side (left side) of the upper revolving structure 3 in the width direction.

The after-treatment device 16 performs after-treatment such as detoxifying the exhaust gas from the engine 15 . For example, the after-treatment device 16 processes nitrogen oxides, particulate matter, and the like contained in the exhaust gas. The exhaust gas is then subjected to after-treatment by the after-treatment device 16 and then exhausted to the atmosphere. Further, in the engine room 13, the engine 15 and the aftertreatment device 16 are connected via an exhaust pipe 17. Therefore, exhaust gas from the engine 15 is discharged to the aftertreatment device 16 through the inside of the exhaust pipe 17. In this embodiment, the after-treatment device 16 is provided with a diesel particulate filter (DPF), not shown. The after-treatment device collects particulate matter (PM) contained in the exhaust gas using a diesel particulate filter and removes the particulate matter from the exhaust gas. Do it as.

FIG. 3 shows the configuration of the engine 15, the aftertreatment device 16, and their vicinity in the engine room 13. As shown in FIG. 3, in the engine room 13, an engine frame 21 is attached to the turning table 11. Then, the engine 15 is installed on the engine frame 21 with an engine mount 22 in between. Further, in the engine room 13, a pair of device frames 23 are attached to the turning table 11 at positions different from the engine frame 21. Here, the turning table 11 is interposed between each of the device frames 23 and the engine frame 21, and each of the device frames 23 is not directly connected to the engine frame 21. Further, the pair of device frames 23 are attached to the turning table 11 at positions separated from each other.

Further, each of the device frames 23 extends vertically upward from the turning table 11. Each of the pair of device frames 23 includes a beam portion (top beam portion) 25 forming a vertically upper end. A relay frame 26 is connected to each beam section 25 of the device frame 23. The relay frame 26 relays between the beam sections 25 of the pair of device frames 23. A pedestal 27 is attached to the beam portions 25 of the pair of device frames 23. The pedestal 27 is supported from vertically below by a pair of device frames 23. Then, the post-processing device 16 is installed on the pedestal 27. In an example such as FIG. 3, the beam portion 25 of the device frame 23 and the pedestal 27 are located vertically above the engine frame 21. For this reason, the aftertreatment device 16 is disposed vertically shifted upward with respect to the engine 15. Note that although only one beam section 25 of the pair of device frames 23 is shown in FIG. 3, the beam section 25 is similarly provided on the other of the pair of device frames 23.

Further, a pump 28 is arranged in the engine room 13. The pump 28 is arranged in line with the engine 15 on the side where the aftertreatment device 16 is located (left side) in the width direction of the revolving upper structure 3 . Further, the pump 28 is arranged vertically below the post-processing device 16. The beam portion 25 of the device frame 23 and the pedestal 27 are arranged between the pump 28 and the post-processing device 16 in the vertical direction.

FIG. 4 shows the configuration of the aftertreatment device 16, the exhaust pipe 17, the pedestal 27, and their vicinity. As shown in FIGS. 3 and 4, the exhaust pipe 17 includes a bellows pipe portion 31 and a folded portion 32. In the exhaust pipe 17 , the bellows pipe portion 31 is arranged on the side closer to the engine 15 with respect to the folded portion 32 , that is, on the side farther from the aftertreatment device 16 . Further, in the exhaust pipe 17, a pipe part 33 that extends straight or substantially straight is provided between the bellows pipe part 31 and the folded part 32. The pedestal 27 includes a bottom plate part 35 and a protruding plate part 36 that projects vertically upward from the bottom plate part 35. The protruding plate part 36 is formed along the edge of the bottom plate part 35 and is formed over the entire circumference of the bottom plate part 35 in the circumferential direction.

Here, in the engine room 13, a first horizontal direction (direction indicated by arrow X3 and arrow The direction indicated by the second horizontal direction (arrow Y3 and arrow Y4) (vertical or substantially vertical) is defined. In this embodiment, the first horizontal direction matches or substantially matches the longitudinal direction of the revolving upper structure 3, and the second horizontal direction matches or substantially matches the width direction of the revolving upper structure 3.

Further, a differential pressure sensor 37 is arranged in the engine room 13. The differential pressure sensor 37 detects the differential pressure before and after the process of removing particulate matter by the diesel particulate filter. Therefore, the differential pressure sensor 37 detects the difference between the pressure before the particulate matter removal process is performed and the pressure after the particulate matter removal process is performed, that is, the engine 15 The difference between the pressure on the side closer to the engine 15 (upstream side) and the pressure on the side farther from the engine 15 than the diesel particulate filter (downstream side) is detected. Based on the detection result from the differential pressure sensor 37, clogging in the diesel particulate filter is detected.

5 and 6 show the configuration of the post-processing device 16, the differential pressure sensor 37, and their vicinity. 5 and 6 have different viewing directions with respect to each other. Further, FIG. 7 shows the post-processing device 16, the differential pressure sensor 37, and their vicinity viewed from one side in the first horizontal direction (arrow X3 side), that is, the front side of the upper revolving structure 3. Shown as viewed from above. FIG. 8 shows the post-processing device 16, the differential pressure sensor 37, and their vicinity viewed from one side in the second horizontal direction (arrow Y4 side), that is, in the width direction of the upper revolving structure 3. The figure is shown as viewed from the side where the engine 15 is located. Note that FIGS. 7 and 8 also show a pedestal 27 on which the post-processing device 16 is installed.

As shown in FIGS. 4 to 8 and the like, in the engine room 13, the exhaust pipe 17 is arranged on one side (arrow X4 side) of the aftertreatment device 16 in the first horizontal direction. In this embodiment, the exhaust pipe 17 is arranged on the rear side of the upper revolving structure 3 with respect to the aftertreatment device 16. Moreover, the differential pressure sensor 37 is arranged on the side opposite to the side where the exhaust pipe 17 is located with respect to the aftertreatment device 16 in the first horizontal direction. Therefore, the aftertreatment device 16 is sandwiched between the exhaust pipe 17 and the differential pressure sensor 37 in the first horizontal direction. In this embodiment, the differential pressure sensor 37 is arranged on the outer surface of the aftertreatment device 16 at a location facing away from the side where the exhaust pipe 17 is located. The differential pressure sensor 37 is arranged on the front side of the upper revolving structure 3 with respect to the post-processing device 16.

Further, in a portion of the outer surface of the aftertreatment device 16 facing opposite to the side where the exhaust pipe 17 is located, a differential pressure sensor 37 is arranged at the center of the aftertreatment device 16 in the second horizontal direction. Therefore, the differential pressure sensor 37 is placed a certain distance away from the engine 15, which is arranged on one side of the second horizontal direction with respect to the aftertreatment device 16. Here, the differential pressure sensor 37 is not in contact with the post-processing device 16. The differential pressure sensor 37 is supported by a bracket 38 and connected to the base 27 with the bracket 38 interposed therebetween.

Moreover, pressure guide pipes 41 and 42 are connected to the differential pressure sensor 37. Each of the pressure impulse tubes 41 and 42 is made of metal, for example. The pressure guide pipe (first pressure guide pipe) 41 guides the pressure before the process of removing particulate matter by the diesel particulate filter to the differential pressure sensor 37 . The pressure guide pipe (second pressure guide pipe) 42 guides the pressure after the process of removing particulate matter by the diesel particulate filter to the differential pressure sensor 37 . One end of each of the pressure guiding pipes 41 and 42 is connected to the differential pressure sensor 37. The pressure guide tube 41 is connected to the differential pressure sensor 37 via a rubber tube 43, and the pressure guide tube 42 is connected to the differential pressure sensor 37 via a rubber tube 45.

The pressure guiding pipe 42 extends from the differential pressure sensor 37 along a portion of the outer surface of the post-processing device 16 facing away from the side where the exhaust pipe 17 is located. Then, the pressure impulse pipe 42 is inserted into the interior of the aftertreatment device 16 at a portion of the outer surface of the aftertreatment device 16 that faces the side opposite to the side where the exhaust pipe 17 is located. Inside the aftertreatment device 16, the end of the impulse pipe 42 opposite to the differential pressure sensor 37 communicates with a region farther from the engine 15 (downstream) than the diesel particulate filter. This makes it possible for the pressure guiding pipe 42 to guide the pressure in the region downstream of the diesel particulate filter to the differential pressure sensor 37.

Further, in this embodiment, the post-processing device 16 is installed vertically above the bottom plate portion 35 of the pedestal 27 with a gap 46 between the post-processing device 16 and the pedestal 27 . The pressure impulse pipe (first pressure impulse pipe) 41 includes extending pipe portions 47 and 48 . The extension pipe section (first extension pipe section) 47 of the impulse pipe 41 extends along a portion of the outer surface of the aftertreatment device 16 that faces opposite to the side where the exhaust pipe 17 is located, and It extends vertically downward from the pressure sensor 37. One end of the extension pipe section (second extension pipe section) 48 of the impulse pipe 41 is connected to the end (vertically lower end) of the extension pipe section 47 on the opposite side to the differential pressure sensor 37 . The extension pipe portion 48 extends from the connection position to the extension pipe portion 47 along the first horizontal direction (the front-rear direction of the upper revolving structure 3). The extension pipe section 48 passes from the connection position to the extension pipe section 47 through the gap 46 between the aftertreatment device 16 and the pedestal 27 to the side where the exhaust pipe 17 is located (the rear side of the upper revolving structure 3). ) will be extended towards.

The end of the extension pipe section 48 opposite to the connection position to the extension pipe section 47 is connected to a metal pipe member 52 with a rubber tube 51 interposed therebetween. The pipe member 52 is connected to the exhaust pipe 17 at the pipe part 33 between the bellows pipe part 31 and the folded part 32. Therefore, the pressure guide pipe (first pressure guide pipe) 41 connects the differential pressure sensor 37 and the exhaust pipe 17. In this embodiment, the pressure guiding pipe 41 guides the pressure from the inside of the exhaust pipe 17 to the differential pressure sensor 37 before the above-described process of removing particulate matter is performed.

FIG. 9 shows the configuration of the gap 46 between the post-processing device 16 and the pedestal 27. FIG. 9 shows a cross section perpendicular or substantially perpendicular to the first horizontal direction, that is, a cross section perpendicular or substantially perpendicular to the extending direction of the extending pipe portion 48 of the impulse pipe 41. As shown in FIG. As shown in FIGS. 8 and 9, the pedestal 27 is provided with a projection 53 that projects vertically upward from the bottom plate portion 35. As shown in FIGS. In this embodiment, two protrusions 53 are provided, and the protrusions 53 are arranged apart from each other in the first horizontal direction. A bracket 55 is attached to each of the protrusions 53 via screws 56 or the like. Each of the brackets 55 supports the extending pipe portion 48 of the impulse pipe 41 . The bracket 55 supports the pressure impulse pipe 41 in the gap 46 such that the extending pipe portion 48 of the pressure impulse pipe 41 does not contact either the post-processing device 16 or the pedestal 27.

In the engine room 13, the engine 15 and exhaust pipe 17 become hot due to heat generated by the engine 15. In this embodiment, the differential pressure sensor 37 is arranged with the aftertreatment device 16 sandwiched between the exhaust pipe 17 and the aftertreatment device 16 . Therefore, the influence of heat generated by the engine 15 on the differential pressure sensor 37 is reduced. Note that since the aftertreatment device 16 is covered with a cover, the amount of heat radiated to the outside is smaller than that of the engine 15, the exhaust pipe 17, and the like.

Further, in this embodiment, the aftertreatment device 16 is installed vertically above the pedestal 27, and the differential pressure sensor 37 is installed on the outer surface of the aftertreatment device 16 at a portion facing away from the side where the exhaust pipe 17 is located. Placed. Further, in the present embodiment, the pedestal 27 is located vertically above the engine frame 21, and the aftertreatment device 16 is disposed vertically upward relative to the engine 15. Therefore, radiant heat from the engine 15 to the differential pressure sensor 37 is shielded to some extent by the pedestal 27, and the influence of heat from the engine 15 on the differential pressure sensor 37 is further reduced.

Further, in the pedestal 27 , a protruding plate portion 36 is formed along the edge of the bottom plate portion 35 over the entire circumference in the circumferential direction of the bottom plate portion 35 . Therefore, the protruding plate portion 36 of the pedestal 27 blocks radiant heat from the engine 15 to the differential pressure sensor 37 more effectively. Further, the differential pressure sensor 37 is arranged at the center of the aftertreatment device 16 in the second horizontal direction at a portion of the outer surface of the aftertreatment device 16 facing the opposite side to the side where the exhaust pipe 17 is located. . Therefore, the differential pressure sensor 37 is separated from the engine 15 by a certain distance. Therefore, the influence of heat from the engine 15 on the differential pressure sensor 37 is further effectively reduced. Furthermore, the pedestal 27 reduces the influence of heat from members such as the post-processing device 16 located vertically above the pedestal 27 on the pump 28 and the like located vertically below the pedestal 27.

Further, the differential pressure sensor 37 does not come into contact with the post-processing device 16 and is connected to the pedestal 27 with a bracket 38 interposed therebetween. Therefore, transmission of heat, vibration, etc. from the post-processing device 16 to the differential pressure sensor 37 is effectively prevented. This further reduces the influence of heat generated by the engine 15 on the differential pressure sensor 37.

Further, in this embodiment, the extending pipe portion 48 of the pressure impulse pipe (first pressure impulse pipe) 41 is extended through the gap 46 between the post-processing device 16 and the pedestal 27 . Therefore, the portion of the impulse tube 41 that is exposed to the outside is reduced. This effectively prevents an operator from coming into contact with the impulse pipe 41 during maintenance work of the post-processing device 16, and effectively prevents damage to the impulse pipe 41.

Further, the pressure impulse pipe (first pressure impulse pipe) 41 connects between the differential pressure sensor 37 and the exhaust pipe 17, and transmits the pressure from the exhaust pipe 17 before the above-mentioned process for removing particulate matter is performed. It leads to the differential pressure sensor 37. Here, in the exhaust gas flow path inside the aftertreatment device 16, there are many rapid direction change portions and rapid cross-sectional change portions, so pressure fluctuations are likely to occur. On the other hand, the exhaust pipe 17 has few parts where there is a sudden change in direction. Therefore, pressure fluctuations are less likely to occur in the exhaust pipe 17 than in the exhaust gas flow path inside the aftertreatment device 16. Therefore, by introducing the pressure before the process of removing particulate matter from the exhaust pipe 17 to the differential pressure sensor 37, the accuracy of differential pressure detection by the differential pressure sensor 37 is improved.

Further, the pressure guiding pipe 41 guides pressure from the straight or substantially straight pipe portion 33 to the differential pressure sensor 37 . That is, pressure is guided to the differential pressure sensor 37 by the pressure guiding pipe 41 from a region in the exhaust pipe 17 where pressure fluctuations are less likely to occur. The accuracy of differential pressure detection by the differential pressure sensor 37 is further improved. In this embodiment, since the differential pressure sensor 37 is arranged with the aftertreatment device 16 sandwiched between the exhaust pipe 17 and the exhaust pipe 17, the differential pressure sensor 37 and the exhaust pipe 17 are connected by the pressure guide pipe 41. In this case, the extension length of the impulse pipe 41 becomes long. Therefore, even if the pressure impulse pipe 41 connects the differential pressure sensor 37 and the exhaust pipe 17, heat transfer from the exhaust pipe 17 to the differential pressure sensor 37 via the pressure impulse pipe 41 is suppressed, and the exhaust pipe 17 to the differential pressure sensor 37 is reduced.

Further, in this embodiment, the pressure impulse pipe 41 is supported by the bracket 55 in the gap 46 such that the extending pipe portion 48 of the pressure impulse pipe 41 does not contact either the post-processing device 16 or the pedestal 27 . Therefore, transmission of heat, vibration, etc. from the post-processing device 16 to the differential pressure sensor 37 via the pressure guide pipe 41 is effectively prevented.

Further, in the present embodiment, the pressure guide tube 41 is connected to the differential pressure sensor 37 via a rubber tube 43, and the pressure guide tube 42 is connected to the differential pressure sensor 37 via a rubber tube 45. Further, the pressure guiding pipe 41 is connected to a pipe member 52 with a rubber pipe 51 interposed therebetween. By providing the rubber tubes 43, 45, 51, vibrations and thermal expansion of the impulse tubes 41, 42 are absorbed by the rubber tubes 43, 45, 51. This effectively prevents damage to the impulse pipes 41 and 42.

In the above embodiments, the hydraulic excavator 1 was explained as an example, but the configurations of the engine 15, aftertreatment device 16, exhaust pipe 17, differential pressure sensor 37, etc., are different from those of the lower traveling body 2 and the upper Any construction machine including the revolving body 3 is applicable. An example of a construction machine other than the hydraulic excavator 1 to which the configuration of the above-described embodiment is applied is a crane.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention at the implementation stage. Moreover, each embodiment may be implemented by appropriately combining them as much as possible, and in that case, the combined effects can be obtained. Further, the embodiments described above include inventions at various stages, and various inventions can be extracted by appropriately combining the plurality of disclosed constituent elements.

DESCRIPTION OF SYMBOLS 1... Hydraulic excavator, 2... Lower traveling body, 3... Upper rotating body, 13... Engine room, 15... Engine, 16... After-treatment device, 17... Exhaust pipe, 27... Pedestal, 37... Differential pressure sensor, 41... Guide Pressure pipe (first pressure pipe), 42... pressure pipe (second pressure pipe), 46... gap.

Claims (2)

a lower running body;
an upper rotating body connected to a vertically upper side of the lower traveling body so as to be able to rotate with respect to the lower traveling body;
an engine mounted on the upper revolving body;
An after-treatment device that is mounted on the upper revolving body and that after-treats exhaust gas from the engine and exhausts it to the atmosphere, the after-treatment device that collects particulate matter contained in the exhaust gas and removes the particulate matter. an after-treatment device that at least performs a process of removing from the exhaust gas;
an exhaust pipe connecting between the engine and the aftertreatment device;
a differential pressure sensor that detects a differential pressure before and after the process for removing particulate matter, the differential pressure sensor being disposed with the post-processing device sandwiched between it and the exhaust pipe;
a pedestal on which the post-processing device is installed on the vertically upper side with a gap formed therebetween;
a first pressure conduit that guides the pressure before the process of removing the particulate matter to the differential pressure sensor;
a second pressure pipe that guides the pressure after the process of removing the particulate matter to the differential pressure sensor;
Equipped with
In the construction machine , the first pressure impulse pipe extends through the gap between the post-processing device and the pedestal . The first pressure guiding pipe connects the differential pressure sensor and the exhaust pipe, and guides the pressure before the process of removing particulate matter from the exhaust pipe to the differential pressure sensor. , The construction machine according to claim 1 .