JP2010138832A - Exhaust emission control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform the maintenance operation of a treatment member contained in a cleaning part cylinder by facilitating removal of the cleaning part cylinder from between an upstream cylinder and a downstream cylinder. <P>SOLUTION: Flange parts 23C, 27C, 30B and 30C of the upstream cylinder 22, the downstream cylinder 26 and a filter cylinder 29 includes respectively a plurality of bolt insert holes 27C, 30D and 30E, and a long bolt 33 is inserted to the lower bolt insert holes 27D, 30D and 30E which a tool does not reach, and fastened to a nut 23D of the upstream cylinder 22. According to this, each of the cylinders 22, 26 and 29 can be fixed together by the long bolt 33 with the filter cylinder 29 being held between the upstream cylinder 22 and the downstream cylinder 26. The use of the long bolt 33 allows removal of only the filter cylinder 29 from between the upstream cylinder 22 and the downstream cylinder 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust gas purification apparatus suitable for use in removing harmful substances in exhaust gas discharged from an engine, for example.

  In general, a construction machine such as a hydraulic excavator is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an upside-down movable structure provided on the front side of the upper revolving body. And a work device. The upper revolving structure is equipped with an engine for driving a hydraulic pump at the rear of the revolving frame, and exhaust gas purification for removing and purifying harmful substances in the exhaust gas is provided in the exhaust pipe of the engine. A device is provided.

  An exhaust gas purifying device provided in a hydraulic excavator includes an oxidation catalyst that oxidizes and removes carbon monoxide (CO) and hydrocarbons (HC) in exhaust gas, and particulate matter (PM: Particulate in exhaust gas). A filter equipped with a particulate matter removal filter (usually referred to as Diesel Particulate Filter, abbreviated as DPF) for collecting and removing Matter is known (see, for example, Patent Document 1).

JP 2003-120277 A

  The exhaust gas purifying apparatus according to Patent Document 1 includes, for example, an upstream cylinder that is connected to an exhaust pipe and has an oxidation catalyst built therein, and a downstream cylinder that is spaced apart from the upstream cylinder in the axial direction and discharges exhaust gas. And a filter cylinder that is provided between the upstream cylinder and the downstream cylinder and has a built-in particulate matter removal filter for collecting particulate matter contained in the exhaust gas.

  In addition, flange portions that are radially expanded are provided at the outflow side end of the upstream cylinder, the inflow end of the downstream cylinder, and the inflow and outflow ends of the filter cylinder. In the part, a plurality of bolt insertion holes are formed at intervals in the circumferential direction so as to communicate between the facing flange parts.

  And each cylindrical body inserts a bolt in each bolt insertion hole of the flange part which faces, and fastens the external thread to a nut, and thereby an upstream cylinder and a filter cylinder, a downstream cylinder, and a filter cylinder Can be fastened together.

  Here, the particulate matter removing filter burns and removes the collected particulate matter, but the ash content after burning gradually accumulates. At this time, the filter cylinder is removed by loosening the bolts connected to the upstream cylinder and the downstream cylinder, and the filter cylinder is pulled out between the upstream cylinder and the downstream cylinder to remove particulate matter in the filter cylinder. The ash accumulated on the filter is cleaned and regenerated.

  As described above, in the exhaust gas purifying apparatus of Patent Document 1, the bolts are inserted into the plurality of bolt insertion holes formed at intervals in the circumferential direction of the respective flange portions, and the male screws are adjacent to each other by being fastened to the nuts. The cylinders are connected together. However, around the engine where the exhaust gas purification device is disposed, other structures such as a hydraulic oil tank and a counterweight, various pipes, wirings, and the like are disposed close to each other. It is difficult to secure a space for loosening and tightening the bolts around.

  As a result, in a state where the exhaust gas purification device is attached to the engine side, it is difficult for the tools to reach the bolts located on the lower side (engine side) because each cylinder is in the way, and it is also difficult to operate the tools. . Therefore, in the exhaust gas purifying apparatus according to Patent Document 1, when removing the filter cylinder, the entire exhaust gas purifying apparatus must be removed from the engine side, and each cylinder must be attached and removed at another work place. There is a problem that workability is poor.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to easily remove the purification section cylinder from between the upstream cylinder and the downstream cylinder. An object of the present invention is to provide an exhaust gas purifying apparatus capable of efficiently performing maintenance work for a built-in processing member.

  An exhaust gas purifying apparatus according to the present invention includes an upstream cylinder connected to an exhaust pipe of an engine mounted on a vehicle body, a downstream cylinder that is disposed apart from the upstream cylinder in the axial direction, and exhausts exhaust gas, A purification unit cylinder that is provided between the upstream cylinder and the downstream cylinder and has a processing member for purifying exhaust gas, and has an outlet side end of the upstream cylinder and a downstream cylinder The inflow side end portion and the purification portion cylindrical body are provided with flange portions that are radially expanded at the inflow side and outflow side ends.

  In order to solve the above-described problems, the configuration of the invention adopted in claim 1 is characterized in that a plurality of flange portions of the upstream cylinder body, the downstream cylinder body, and the purification section cylinder body are circumferentially spaced. And has a length dimension for fastening the flange portion of the upstream cylinder body and the flange portion of the downstream cylinder body with the purification section cylinder interposed therebetween, one end being a bolt head and the other end being a male screw. A long bolt, and the male screw is fastened to the nut with the long bolt inserted into each bolt insertion hole and the purification section cylinder sandwiched between the upstream cylinder and the downstream cylinder. By wearing, it is in the structure which fixed each of these cylinders together.

  According to a second aspect of the present invention, the long bolt is configured to be inserted into a bolt insertion hole at a position in a circumferential direction of the flange portion among the bolt insertion holes.

  According to a third aspect of the present invention, the bolt insertion hole located at a part of the flange portion in the circumferential direction is provided on a straight line with respect to the flange portion.

  According to a fourth aspect of the present invention, the nut is fixedly provided on a flange portion of the upstream cylindrical body.

  According to a fifth aspect of the present invention, the flange portion of the upstream cylinder body and the flange portion of the downstream cylinder body are provided with legs for attaching the upstream cylinder body and the downstream cylinder body to the vehicle body side or the engine side, The nut is fixed to the leg body.

  According to the invention of claim 1, the upstream cylindrical body, the downstream cylindrical body, and the purification section cylindrical body are arranged in the axial direction, the long bolts are inserted into the bolt insertion holes provided in the respective flange portions, and the male screw is used as the nut. Fasten. Thereby, a long volt | bolt and a nut can fix these each cylinder together in the state which pinched | purified the purification | cleaning part cylinder between the upstream cylinder and the downstream cylinder.

  Therefore, the long bolt has a total of two connecting portions between the flange portion of the upstream cylinder and the flange portion of the purification unit cylinder, and between the flange portion of the downstream cylinder and the flange portion of the purification unit cylinder. Can be connected at once. This allows long bolts to be inserted into each bolt insertion hole from the downstream cylinder side, for example, even when connecting a place where the tool on the opposite side of the operator is difficult to reach, and the bolt head can be tightened or loosened with a tool. can do.

  As a result, when removing the purification unit cylinder in order to clean and inspect the processing member, only the purification unit cylinder can be removed and attached from between the upstream cylinder and the downstream cylinder. Workability such as maintenance work can be improved.

  According to the invention of claim 2, when the long bolt is attached to a part of the circumferential direction of the flange portion of each cylindrical body, for example, the exhaust gas purification device on the vehicle body side or the engine side, each cylindrical body becomes an obstacle. It is inserted through the bolt insertion hole at the back position in the circumferential direction where it is difficult for hands and tools to reach. Accordingly, the long bolt that can be inserted and fastened from the axial direction even at a position where a hand or a tool is difficult to reach is connected to the upstream cylinder and the purification section cylinder, and the downstream cylinder and the purification section cylinder. Both can be connected at the same time.

  According to the invention of claim 3, among the plurality of bolt insertion holes of each flange portion, the bolt insertion holes located on the back side of each cylindrical body that is a part in the circumferential direction are aligned with each flange portion. Since long bolts can be easily inserted into these bolt insertion holes, workability can be improved.

  According to the invention of claim 4, since the nut is fixedly provided to the flange portion of the upstream cylinder, a long bolt is inserted from the downstream cylinder side, and a tool such as a socket wrench is fitted to the bolt head. When the male screw is fastened to the nut, the long bolt can be attached and removed from the downstream cylinder side without preventing the nut from rotating.

  According to the invention of claim 5, the upstream cylindrical body and the downstream cylindrical body can be stably attached to the vehicle body side or the engine side by the legs provided on the respective flange portions. Also, since the nut is fixedly attached to the leg of the upstream cylinder, a long bolt is inserted from the downstream cylinder side, a socket wrench is fitted to the bolt head, and the male screw is attached to the leg nut. By fastening, the long bolt can be attached and removed from the downstream cylinder side without stopping the nut. Moreover, each leg can be attached together with the connection between the respective cylinders, and the assembling workability can be improved.

  Hereinafter, a case where an exhaust gas purifying apparatus according to an embodiment of the present invention is mounted on a hydraulic excavator will be described as an example and described in detail with reference to the accompanying drawings. In the embodiment, as a specific example of the processing member accommodated in the purification unit cylinder of the exhaust gas purification device, a case where a particulate matter removal filter that collects particulate matter (PM) in the exhaust gas is accommodated. Illustrated. In addition to this, the purification section cylinder can also contain other processing members such as a NOx purification device and a three-way catalyst that purify nitrogen oxide (NOx) using an aqueous urea solution.

  1 to 11 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a crawler hydraulic excavator as a construction machine. The hydraulic excavator 1 is mounted on a self-propelled lower traveling body 2 and on the lower traveling body 2 so as to be turnable. 2 is constituted roughly by an upper swing body 3 constituting a vehicle body, and a work device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down and performing excavation work of earth and sand. The lower traveling body 2 and the upper swing body 3 are specific examples of the vehicle body according to the present invention.

  Here, the upper swing body 3 constituting the excavator 1 will be described in detail. Reference numeral 5 denotes a swing frame of the upper swing body 3, and the swing frame 5 is configured as a support structure. Further, the working device 4 is attached to the front side of the revolving frame 5 so as to be able to move up and down and is located at the center in the left and right directions, and an engine 8 and the like to be described later are provided on the rear side.

  Reference numeral 6 denotes a cab mounted on the left front side of the revolving frame 5 (left side of the foot part of the working device 4). The cab 6 is mounted by an operator, and a driver's seat on which the operator sits, An operation lever, a work operation lever, and the like (both not shown) are provided.

  Reference numeral 7 denotes a counterweight attached to the rear end portion of the revolving frame 5. The counterweight 7 balances the weight with the working device 4 and protrudes so that the rear side is curved as shown in FIG. The counterweight 7 is a wall member that closes the rear side of an engine 8, a hydraulic pump 10, an exhaust gas purification device 21, and the like, which will be described later.

  Reference numeral 8 denotes an engine provided on the rear side of the revolving frame 5, and the engine 8 is mounted on the front side of the counterweight 7 so as to extend leftward and rightward. A cooling fan 8A for supplying cooling air to a heat exchanger 9 described later is provided on the left side of the engine 8.

  On the other hand, the right side in the longitudinal direction of the engine 8 is a pump mounting portion 8B for mounting a hydraulic pump 10 described later, as shown in FIGS. In addition, a turbocharger 8C such as a turbocharger that increases the flow rate of intake air is connected to the exhaust manifold 8D at the front upper portion of the engine 8, and extends to the left and right in the supercharger 8C. Thus, the exhaust pipe 8E is connected. The engine 8 is supported on the revolving frame 5 in a vibration-proof state.

  Reference numeral 9 denotes a heat exchanger disposed on the left side of the engine 8, and the heat exchanger 9 is provided to face the cooling fan 8A. The heat exchanger 9 includes, for example, a radiator that cools engine cooling water, an oil cooler that cools hydraulic oil, an intercooler that cools air taken in by the engine 8, and the like.

  Reference numeral 10 denotes a hydraulic pump disposed on the right side of the engine 8, and the hydraulic pump 10 is driven by the engine 8 to discharge hydraulic oil supplied from a hydraulic oil tank 12 described later as pressure oil. is there. As shown in FIG. 4, the base end side of the hydraulic pump 10 is a flange portion 10 </ b> A, and the flange portion 10 </ b> A is attached to the pump attachment portion 8 </ b> B of the engine 8 using a plurality of bolts 11.

  Reference numeral 12 denotes a hydraulic oil tank (see FIG. 2) which is located on the front side of the hydraulic pump 10 and is provided on the right side of the swivel frame 5. The hydraulic oil tank 12 drives the lower traveling body 2, the work device 4 and the like. The hydraulic oil is stored. Further, the hydraulic oil tank 12 is disposed with a slight gap on the front side of an exhaust gas purification device 21 described later, and serves as a closing member that closes the front side of the exhaust gas purification device 21. On the other hand, 13 indicates a fuel tank provided on the front side of the hydraulic oil tank 12.

  Reference numeral 14 denotes a building cover (see FIGS. 1 and 2) that covers the engine 8, the heat exchanger 9, an exhaust gas purification device 21 and the like, which will be described later, and the building cover 14 is located on the left side of the upper swing body 3 and performs heat exchange. A left side cover 14A covering the side of the vessel 9, a right side cover 14B positioned on the right side of the upper swing body 3 and covering the side of the hydraulic pump 10, and an upper cover 14C covering the upper side of the engine 8 and the like. And is roughly composed. The upper cover 14C is provided with an openable / closable engine cover 14D so as to close an opening for maintenance work.

  A partition member 15 is provided in the building cover 14 and is provided on the right side of the engine 8. The partition member 15 is generally called a firewall. For example, the structure such as the revolving frame 5 and the building cover 14 is provided. Installed on. The partition member 15 is disposed on the right side of the exhaust gas purification device 21 with a slight gap, and serves as a closing member that closes the right side of the exhaust gas purification device 21. Further, the rear portion of the partition member 15 is greatly separated from the rear side of the exhaust gas purification device 21 to secure a space where a socket wrench 34 described later can be operated.

  The partition member 15 partitions the interior of the building cover 14 into a space on the engine side where the engine 8, the exhaust gas purifying device 21 and the like are disposed, and a space on the pump side where the hydraulic pump 10 is disposed. Even when hydraulic fluid leaks around the engine, the leaked hydraulic oil is prevented from scattering to the engine 8 side.

  Reference numeral 16 denotes a purification device mounting base that is located on the right side of the engine 8 and is located above the hydraulic pump 10. The purification device mounting base 16, as shown in FIG. It is attached to the side. The purifier mounting base 16 includes a vertical plate portion 16A that is positioned on the left side on the engine 8 side and extends substantially vertically, and a horizontal plate portion 16B that extends substantially horizontally from the vertical plate portion 16A toward the right side. It is configured. The purifier mounting base 16 abuts the vertical plate portion 16A against the flange portion 10A of the hydraulic pump 10, and in this state, the bolt 11 is used together with the flange portion 10A to the pump mounting portion 8B of the engine 8. Installed.

  Next, an exhaust gas purification apparatus 21 according to the first embodiment that removes and purifies harmful particulate matter (PM) contained in the exhaust gas of the engine 8 will be described with reference to FIGS. 2 to 11. I will explain. In the first embodiment, the filter cylinder 29 containing the particulate matter removal filter 31 that collects particulate matter (PM) in the exhaust gas is specifically used as the purification unit cylinder of the exhaust gas purification device. It is described as an example. In addition, the purification section cylinder may be configured to accommodate other processing members such as a NOx purification device that purifies nitrogen oxide (NOx) using an aqueous urea solution and a three-way catalyst.

  That is, reference numeral 21 denotes the exhaust gas purifying device according to the first embodiment which is located on the upper right side of the engine 8 and connected to the exhaust pipe 8E. This exhaust gas purification device 21 removes particulate matter contained in the exhaust gas flowing through the exhaust pipe 8E. Further, the exhaust gas purifying device 21 is arranged in a vertical state, for example, such that the front side in the front and rear directions is the upstream side (inflow side) and the rear side is the downstream side (outflow side). The exhaust gas purifying device 21 is roughly constituted by an upstream cylindrical body 22, a downstream cylindrical body 26, a filter cylindrical body 29, a short bolt 32, a long bolt 33 and the like which will be described later.

  Further, as shown in FIG. 3, in the exhaust gas purification device 21, the upstream cylindrical body 22 located on the front side is disposed in the vicinity of the rear side of the hydraulic oil tank 12 and is connected to the exhaust pipe 8 </ b> E of the engine 8. . Thereby, the upstream cylinder 22 is fixedly arranged in the front and rear directions, and the distance from the hydraulic oil tank 12 is a slight dimension G1. For this reason, it is difficult to insert a long bolt 33 (to be described later) or operate the socket wrench 34 from between the upstream cylinder 22 and the hydraulic oil tank 12.

  On the other hand, on the rear side of the exhaust gas purification device 21, the downstream cylinder 26 is greatly separated from the rear end portion of the partition member 15 with a dimension G2. Accordingly, the long bolt 33 can be inserted or the socket wrench 34 can be operated from between the downstream cylindrical body 26 and the partition member 15.

  Further, as shown in FIG. 5, the exhaust gas purifying device 21 uses three short cylinders 32 and long bolts 33, which are an upstream cylinder 22, a downstream cylinder 26 and a filter cylinder 29 described later. It is configured to be fastened integrally. As shown in FIG. 6, the upstream cylindrical body 22 contains an oxidation catalyst 25, and the filter cylindrical body 29 contains a particulate matter removal filter 31.

  First, reference numeral 22 denotes an upstream cylinder that is located on the front side (upstream side) of the exhaust gas purification device 21 and to which the exhaust pipe 8E is connected. The upstream cylinder 22 constitutes an inlet portion into which exhaust gas flows. That is, as shown in FIGS. 6, 8, etc., the upstream cylindrical body 22 is provided with one cylindrical member 23 and an inflow to which the exhaust pipe 8 </ b> E of the engine 8 is connected upstream of the cylindrical member 23. The pipe 24 and the oxidation catalyst 25 provided in the cylindrical member 23 located downstream from the inflow pipe 24 are roughly configured.

  Reference numeral 23 denotes a cylindrical member that forms the outer shape of the upstream cylindrical body 22, and the cylindrical member 23 includes a large-diameter cylindrical portion 23A and a lid portion that is provided by closing the front side (upstream side) of the cylindrical portion 23A. 23B and a flange portion 23C which is located at the rear (downstream) end which is the outflow side of the cylindrical portion 23A and is provided with a radially increased diameter.

  Here, the flange portion 23C faces the front flange portion 30B of the tubular member 30 constituting the filter cylinder 29, and penetrates the flange portion 23C in the axial direction at a substantially constant interval in the circumferential direction. A plurality of, for example, ten bolt insertion holes (not shown) are provided. Further, as shown in FIGS. 8 to 10, for example, ten nuts 23 </ b> D are welded to the flange portion 23 </ b> C so as to be located on the front surface opposite to the front flange portion 30 </ b> B corresponding to each bolt insertion hole. It is fixed using means. These ten nuts 23 </ b> D are for screwing a short bolt 32 and a long bolt 33 described later.

  Further, the cylindrical member 23 is provided with a leg 23E located below the cylindrical portion 23A. The leg body 23E is for fixedly mounting the exhaust gas purifying device 21 on the horizontal plate portion 16B of the purifying device mounting base 16 located on the engine 8 side.

  Reference numeral 24 denotes an inflow pipe provided on the upstream side (inflow side) of the cylindrical portion 23 </ b> A of the cylindrical member 23. The inflow pipe 24 is formed of a cylindrical body having a silencing function that penetrates the cylindrical portion 23A in the diameter direction (lateral direction), and an exhaust pipe 8E is connected to an end portion protruding to the engine 8 side. Thereby, the upstream cylinder 22 is fixed in the front and rear directions with respect to the engine 8 (supercharger 8 </ b> C), and is disposed in the vicinity of the rear surface of the hydraulic oil tank 12.

  Reference numeral 25 denotes an oxidation catalyst provided on the upstream cylinder 22, and the oxidation catalyst 25 is provided on the downstream side in the cylindrical member 23, which is downstream from the inflow pipe 24. The oxidation catalyst 25 oxidizes and removes harmful substances such as carbon monoxide (CO) and hydrocarbons (HC) contained in the exhaust gas. Further, the oxidation catalyst 25 is made of, for example, a ceramic cell-like cylinder, and a large number of through holes are formed in the axial direction, and the inner surface is coated with a noble metal or the like.

  Next, reference numeral 26 denotes a downstream cylinder that is provided at a rear position on the downstream side of the upstream cylinder 22 with a filter cylinder 29 described later interposed therebetween. The downstream cylindrical body 26 constitutes an outlet portion through which exhaust gas flows out. That is, the downstream cylindrical body 26 is constituted by a cylindrical member 27 and an outflow pipe 28 which will be described later.

  Reference numeral 27 denotes a cylindrical member constituting the downstream cylindrical body 26. The cylindrical member 27 is substantially the same as the cylindrical member 23 of the upstream cylindrical body 22, and has a large cylindrical portion 27A and a rear side of the cylindrical portion 27A. The lid portion 27B provided by closing the (downstream side) and the flange portion 27C provided by expanding the front side (upstream side) end portion serving as the inflow side of the cylindrical portion 27A in the radial direction. It is configured.

  Here, the flange portion 27C faces the rear flange portion 30C of the tubular member 30 constituting the filter cylinder 29, and penetrates the flange portion 27C in the axial direction at a substantially constant interval in the circumferential direction. A plurality of, for example, ten bolt insertion holes 27D are provided. Further, as shown in FIG. 5 and the like, the flange portion 27C is provided with a nut 27E located on the rear surface opposite to the rear flange portion 30C. The nut 27E is positioned above the intermediate portion excluding, for example, the four bolt insertion holes 27D positioned on the lower side of the ten bolt insertion holes 27D and sandwiched between the purification device mounting base 16 and the nut 27E. Corresponding to the six bolt insertion holes 27D to be fixed by welding means. These six nuts 27E are for screwing a short bolt 32 described later.

  Further, the cylindrical member 27 is provided with legs 27F located below the cylindrical portion 27A. The leg 27F is fixedly mounted on the horizontal plate portion 16B of the purifier mounting base 16 located on the engine 8 side in cooperation with the leg 23E described above.

  Reference numeral 28 denotes an outflow pipe provided on the downstream side of the cylindrical portion 27 </ b> A of the cylindrical member 27. The outflow pipe 28 is formed of a cylindrical body having a silencing function that penetrates the cylindrical portion 27A in the diameter direction (longitudinal direction), and an end protruding upward is a tail pipe.

  Reference numeral 29 denotes a filter cylinder as a purification section cylinder provided between the upstream cylinder 22 and the downstream cylinder 26. The filter cylinder 29 forms a main body portion of the exhaust gas purifying device 21 and is roughly constituted by a cylindrical member 30 and a particulate matter removal filter 31 which will be described later.

  Reference numeral 30 denotes a cylindrical member constituting the outer shape of the filter cylinder 29, and the cylindrical member 30 is radially expanded in diameter to the cylindrical portion 30A and the front side (upstream side) which is the inflow side of the cylindrical portion 30A. The front flange portion 30B is provided, and the rear flange portion 30C is provided with an enlarged diameter on the rear side (downstream side) which is the outflow side of the cylindrical portion 30A.

  Here, the front flange portion 30B faces the flange portion 23C of the tubular member 23 constituting the upstream cylindrical body 22, and penetrates the front flange portion 30B in the axial direction with a substantially constant interval in the circumferential direction. For example, ten bolt insertion holes 30D are provided. On the other hand, the rear flange portion 30C faces the flange portion 27C of the cylindrical member 27 constituting the downstream cylindrical body 26, and the rear flange portion 30C includes ten pieces at the same position as the bolt insertion hole 30D. Bolt insertion hole 30E is provided.

  31 is a particulate matter removal filter (usually called Diesel Particulate Filter, abbreviated as DPF) accommodated in the cylindrical member 30, and the particulate matter removal filter 31 is an exhaust gas discharged from the engine 8. The exhaust gas is purified by collecting particulate matter (PM) in the gas.

  As shown in FIGS. 6 and 7, the particulate matter removal filter 31 has a cellular cylindrical body in which a large number of small holes 31 </ b> A are provided in the axial direction in a porous member made of, for example, a ceramic material. The end portions of the holes 31A that are alternately different from each other are closed by the sealing member 31B. Thereby, the particulate matter removal filter 31 collects particulate matter by passing the exhaust gas flowing into the small hole 31A from the front side through the porous material, and the purified exhaust gas from the adjacent small hole 31A to the rear side. To leak.

  On the other hand, the particulate matter removing filter 31 burns and removes the particulate matter when a lot of particulate matter is accumulated in each small hole 31A. However, even if the particulate matter is burned, a part of it becomes ash and gradually accumulates in the small holes 31A. In addition, other unburned residues such as heavy metals and calcium in the engine oil are gradually deposited. Therefore, the particulate matter removal filter 31 removes the filter body 29 and removes the deposits.

  Here, the upstream cylindrical body 22, the downstream cylindrical body 26, and the filter cylindrical body 29 constituting the exhaust gas purification device 21 have flange portions 23C, 27C, 30B, and 30C in the respective cylindrical members 23, 27, and 30. Each of the flange portions 23C, 27C, 30B, and 30C is formed with ten bolt insertion holes 27D, 30D, and 30E at regular intervals in the circumferential direction.

  In the first embodiment, among the 10 bolt insertion holes 27D, 30D, and 30E, each of the six bolt insertion holes located on the upper side from the middle portion that is exposed to the upper side and easily reaches the hand or tool. A normal short bolt 32 is inserted into 27D, 30D, and 30E, and fastened to the nuts 23D and 27E. Thereby, between the flange part 23C of the upstream cylinder 22 and the front flange part 30B of the filter cylinder 29, and between the flange part 27C of the downstream cylinder 26 and the rear flange part 30C of the filter cylinder 29. It is set as the structure concluded separately.

  On the other hand, the lower cylinders 22, 26, and 29 that do not reach the hands and tools due to the obstructions of the respective cylinders 22, 26, and 29 and the horizontal plate portion 16 </ b> B of the purification device mounting base 16 are located on the lower side. A long bolt 33 (to be described later) is inserted into the four bolt insertion holes 27D, 30D, and 30E from the rear side and fastened to the nut 23D. Thereby, between the flange part 23C of the upstream cylinder 22 and the front flange part 30B of the filter cylinder 29, and between the flange part 27C of the downstream cylinder 26 and the rear flange part 30C of the filter cylinder 29. It is configured to be fastened together.

  Next, four long bolts 33 that are inserted into the respective cylinders 22, 26, 29 at the four bolt insertion holes at the lower positions that are part of the circumferential direction of the flange portions 23C, 27C, 30B, 30C. explain.

  That is, reference numeral 33 denotes a plurality of, for example, four long bolts provided at the lower position of each of the cylinders 22, 26, and 29 where the tool is difficult to reach during work. These four long bolts 33 are set to length dimensions for fastening the flange portion 23C of the upstream cylinder 22 and the flange portion 27C of the downstream cylinder 26 with the filter cylinder 29 interposed therebetween. Further, as shown in FIG. 11, the long bolt 33 has a hexagonal bolt head 33A at one end and a male screw 33B at the other end.

  Here, as shown in FIG. 8, the long bolt 33 uses the gap G2 between the downstream cylindrical body 26 and the rear end of the partition member 15 or the right-side gap to rear the exhaust gas purification device 21. From the side, the bolt insertion hole 27D of the downstream cylinder 26, the bolt insertion holes 30C and 30B of the filter cylinder 29, and the bolt insertion hole of the upstream cylinder 22 are inserted in this order. A socket wrench 34 as a screw tightening tool is passed between the downstream cylindrical body 26 and the partition member 15 and engaged with the bolt head 33A of the long bolt 33, and then the socket wrench 34 is screwed. Thus, the male screw 33B is fastened to the nut 23D of the upstream cylindrical body 22.

  Accordingly, the long bolts 33 are provided between the flange portion 23C of the upstream cylinder 22 and the front flange portion 30B of the filter cylinder 29, and between the flange portion 27C of the downstream cylinder 26 and the rear flange of the filter cylinder 29. The part 30C can be fastened together.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration, and the operation thereof will be described next.

  First, the operator gets on the cab 6 of the upper swing body 3, starts the engine 8, and drives the hydraulic pump 10. Thereby, the pressure oil from the hydraulic pump 10 is supplied to various actuators via the control valve. And when the operator who boarded the cab 6 operated the operation lever for driving | running | working, the lower traveling body 2 can be moved forward or backward. On the other hand, by operating the operation lever for work, the work device 4 can be moved up and down to perform excavation work of earth and sand.

  Further, when the engine 8 is in operation, harmful carbon monoxide, hydrocarbons, particulate matter and the like contained in the exhaust gas are discharged from the exhaust pipe 8E. Therefore, the exhaust gas purification device 21 oxidizes and removes carbon monoxide and hydrocarbons by the oxidation catalyst 25 provided in the upstream cylinder 22. Next, the particulate matter removal filter 31 provided in the filter cylinder 29 can discharge the purified exhaust gas from the downstream cylinder 26 to the outside by collecting the particulate matter.

  On the other hand, the particulate matter collected by the particulate matter removal filter 31 is burned and removed (regenerated) when a predetermined amount is deposited. When the particulate matter is burned in this way, the burned ash gradually accumulates on the particulate matter removal filter 31. For this reason, a cleaning operation for removing the ash accumulated on the particulate matter removal filter 31 is required.

  Therefore, a case where a cleaning operation for removing the ash content of the particulate matter deposited on the particulate matter removal filter 31 of the filter cylinder 29 will be described.

  In the cleaning operation of the particulate matter removing filter 31, it is necessary to remove the filter cylinder 29, and the short bolt 32 and the long bolt 33 that fasten the upstream cylinder 22, the downstream cylinder 26 and the filter cylinder 29 are removed. First, when removing the long bolt 33, as shown in FIG. 5, the socket wrench 34 is fitted to the bolt head 33A of the long bolt 33 through the gap between the downstream cylinder 26 and the partition member 15, and the downstream cylinder is inserted. The long bolt 33 is loosened by rotating the lever of the socket wrench 34 in the gap between the body 26 and the partition member 15.

  At this time, since the nut 23D of the upstream cylindrical body 22 into which the male screw 33B of the long bolt 33 is screwed is welded to the flange portion 23C, there is no need to prevent rotation with a spanner or the like, and the exhaust gas purification device The long bolt 33 can be removed only by the work from the rear side of 21.

  Next, when the four long bolts 33 are removed, the twelve short bolts 32 exposed on the upper side are loosened and removed to pull up the filter cylinder 29 as shown in FIG. It can be removed from between the cylindrical bodies 26. When the filter cylinder 29 is moved to another work place, the ash content of the accumulated particulate matter is removed by blowing compressed air or the like toward the particulate matter removal filter 31 in the filter cylinder 29, for example. be able to. On the other hand, the regenerated filter cylinder 29 can be attached between the upstream cylinder 22 and the downstream cylinder 26 by performing an operation in the reverse procedure to the above-described operation.

  Thus, according to the first embodiment, the upstream cylindrical body 22, the downstream cylindrical body 26, and the flanges 23C, 27C, 30B, and 30C of the filter cylindrical body 29 have ten bolts with a constant interval in the circumferential direction. Insertion holes 27D, 30D, and 30E are provided, and long bolts 33 are inserted into the four bolt insertion holes 27D, 30D, and 30E located on the lower side where a hand or a tool cannot reach, and the male screw 33B is connected to the upstream cylindrical body. It is configured to be fastened to 22 nuts 23D. Thereby, the long bolt 33 can fix these cylinders 22, 26, 29 together in a state where the filter cylinder 29 is sandwiched between the upstream cylinder 22 and the downstream cylinder 26.

  Accordingly, the long bolt 33 is provided between the flange portion 23C of the upstream cylinder 22 and the flange portion 30B of the filter cylinder 29, and between the flange portion 27C of the downstream cylinder 26 and the flange portion 30C of the filter cylinder 29. A total of two connection portions can be connected at a time. As a result, the long bolt 33 has a part in the circumferential direction of the flange portions 23C, 27C, 30B, and 30C of each of the cylinders 22, 26, and 29, for example, a place where the tool located on the side opposite to the worker side is difficult to reach. The lower position of each cylindrical body 22, 26, 29 can be easily connected.

  As a result, when removing the filter cylinder 29 in order to clean and inspect the particulate matter removal filter 31, only the filter cylinder 29 can be removed from between the upstream cylinder 22 and the downstream cylinder 26. Moreover, it can be attached and workability such as maintenance work can be improved.

  Further, among the bolt insertion holes 27D, 30D, and 30E of the flange portions 23C, 27C, 30B, and 30C, bolts that are located on the back side (lower side) of the cylindrical bodies 22, 26, and 29 that are part of the circumferential direction. The insertion holes 27D, 30D, and 30E are arranged on a straight line with respect to the flange portions 23C, 27C, 30B, and 30C. Thereby, the long volt | bolt 33 can be easily penetrated with respect to these volt | bolt penetration holes 27D, 30D, and 30E, and workability | operativity can be improved.

  Further, the nut 23D provided on the cylindrical member 23 of the upstream cylinder 22 is configured to be welded to the flange portion 23C. As a result, when the long bolt 33 is rotated by the socket wrench 34, it is not necessary to prevent the nut 23D from rotating. Therefore, the long bolt 33 can be attached and removed only from the downstream cylinder 26 side. it can.

  Next, FIGS. 12 to 15 show an exhaust gas purifying apparatus according to a second embodiment of the present invention. A feature of the present embodiment is that a flange for attaching the upstream cylinder and the downstream cylinder to the vehicle body side or the engine side is provided on the flange part of the upstream cylinder and the flange part of the downstream cylinder, The configuration is such that the leg is fixedly provided. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 12, reference numeral 41 denotes a pair of front legs (only the right side is shown) attached to the left and right flange portions 23 </ b> C of the cylindrical member 23 constituting the upstream cylindrical body 22. The front leg 41 is provided as a separate member from the upstream cylinder 22, and is integrally attached to the flange portion 23 </ b> C by a long bolt 33.

  Further, as shown in FIG. 13, the left and right front legs 41 extend from the lower end of the vertical plate 41A toward the front side as a trapezoidal vertical plate 41A attached to the flange portion 23C of the cylindrical member 23. The horizontal plate 41B and two bolt insertion holes formed in the vertical plate 41A so as to correspond to the second bolt insertion holes from the lower side, which is a part in the circumferential direction of the flange portion 23C (see FIG. (Not shown) and two nuts 41C fixed to the front side of the vertical plate 41A using welding means so as to correspond to the respective bolt insertion holes. Further, a bolt hole 41 </ b> D through which a bolt 42 for fixing to the horizontal plate portion 16 </ b> B of the purification device mounting base 16 is inserted is formed in the horizontal plate 41 </ b> B.

  On the other hand, in FIG. 14, reference numeral 43 denotes a pair of rear legs (only the right side is shown) attached to the flange portion 27 </ b> C of the cylindrical member 27 constituting the downstream cylindrical body 26. The rear leg 43 is provided as a separate member from the downstream cylinder 26 and is integrally attached to the flange portion 27 </ b> C by a long bolt 33.

  Further, as shown in FIG. 15, the left and right rear legs 43 include a trapezoidal vertical plate 43A, a horizontal plate 43B extending from the lower end of the vertical plate 43A toward the front side, and the vertical plate 43A. Are formed by two bolt insertion holes 43C drilled in the bolt and a bolt hole 43D drilled in the horizontal plate 41B.

  Next, when the exhaust gas purification device 21 is assembled using the front and rear legs 41 and 43, the long bolt 33 is inserted into the bolt insertion hole 43 </ b> C of the rear leg 43 and the bolt insertion of the downstream cylinder body 26. The hole 27D, the bolt insertion holes 30E and 30D of the filter cylinder 29, the bolt insertion hole of the upstream cylinder 22, and the bolt insertion hole of the front leg 41 are inserted, and the male screw 33B is fastened to the nut 41C of the front leg 41 To do. Thereby, each cylindrical body 22,26,29 can be fastened integrally, attaching the leg bodies 41,43 to the cylindrical bodies 22,26. And each leg 41,43 can be fixed to the horizontal board part 16B of the purification apparatus mounting stand 16 using the volt | bolt 42. FIG.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the second embodiment, the nut 41C is welded to the front leg 41. Therefore, when the long bolt 33 is fastened, the long bolt 33 can be attached without stopping the rotation of the nut 41C. Removal work can be performed.

  Next, FIGS. 16 and 17 show an exhaust gas purifying apparatus according to a third embodiment of the present invention. The feature of this embodiment is that the front leg and the rear leg are each configured as one component. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 16, reference numeral 51 denotes a front leg attached to the flange portion 23 </ b> C of the cylindrical member 23 constituting the upstream cylindrical body 22. The front leg 51 is provided as a separate member from the upstream cylinder 22 and is integrally attached to the flange portion 23 </ b> C by a long bolt 33.

  In addition, the front leg 51 includes a vertical plate 51A having a concave curved upper edge to stably support the tubular member 23, and a horizontal plate 51B extending from the lower end of the vertical plate 51A toward the front side. And four bolt insertion holes (not shown) drilled in the vertical plate 51A so as to correspond to the bolt insertion holes from the bottom to the second bolt insertion hole, which are part of the circumferential direction of the flange portion 23C. The four nuts 51C fixed to the front surface of the vertical plate 51A using welding means so as to correspond to the bolt insertion holes, and the horizontal plate 51B are drilled and fixed to the purification device mounting base 16. For example, two bolt holes 51D through which the bolts 52 are inserted.

  On the other hand, in FIG. 17, reference numeral 53 denotes a rear leg attached to the flange portion 27 </ b> C of the cylindrical member 27 constituting the downstream cylindrical body 26. The rear leg 53 is provided as a separate member from the downstream cylinder 26 and is integrally attached to the flange portion 27 </ b> C by a long bolt 33.

  The rear leg 53 includes a vertical plate 53A, a horizontal plate 53B extending from the lower end of the vertical plate 53A toward the front side, four bolt insertion holes 53C formed in the vertical plate 53A, It is composed of two bolt holes 53D formed in the horizontal plate 53B.

  Thus, also in the third embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the above-described embodiments. In particular, in the third embodiment, one leg 51, 53 before and after can stably support each cylinder 22, 26.

  Next, FIGS. 18 to 21 show an exhaust gas purifying apparatus according to a fourth embodiment of the present invention. A feature of the present embodiment is that a leg provided separately from the cylinder is attached to the flange of the cylinder using a dedicated bolt. Note that in the fourth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 18, reference numeral 61 denotes a pair of front legs (only the right side is shown) attached to the flange portion 23 </ b> C of the cylindrical member 23 constituting the upstream cylindrical body 22. The front leg 61 is provided as a separate member from the upstream cylindrical body 22, and is integrally attached to the flange portion 23C by a dedicated mounting bolt 62.

  Further, as shown in FIG. 19, the left and right front legs 61 extend from the lower end of the vertical plate 61A toward the front side as a trapezoidal vertical plate 61A attached to the flange portion 23C of the cylindrical member 23. The horizontal plate 61B and two bolt insertion holes formed in the vertical plate 61A so as to correspond to the second bolt insertion hole from the lower side that is a part in the circumferential direction of the flange portion 23C (see FIG. And two nuts 61C fixed to the front side of the vertical plate 61A using welding means so as to correspond to the bolt insertion holes. Further, between each nut 61C of the vertical plate 61A, a bolt hole 61D through which a mounting bolt 62 for mounting to the flange portion 23C is inserted is formed, and the horizontal plate 61B has a horizontal plate portion 16B of the purification device mounting base 16. Bolt holes 61E through which the bolts 63 for fixing to are inserted.

  On the other hand, in FIG. 20, 64 is a pair of left and right rear legs (only the right side is shown) attached to the flange 27C of the cylindrical member 27 constituting the downstream cylinder 26. The rear leg body 64 is provided as a separate member from the downstream cylindrical body 26, and is integrally attached to the flange portion 27C by a dedicated mounting bolt 62.

  Further, as shown in FIG. 21, the left and right rear legs 64 include a trapezoidal vertical plate 64A, a horizontal plate 64B extending from the lower end of the vertical plate 64A toward the front side, and the vertical plate 64A. Two bolt insertion holes 64C, bolt holes 64D formed between the bolt insertion holes 64C of the vertical plate 64A, and bolt holes 64E formed in the horizontal plate 64B. Has been.

  Thus, also in the fourth embodiment configured as described above, it is possible to obtain substantially the same operational effects as the above-described embodiments. In particular, in the fourth embodiment, legs 61 and 64 provided separately from the cylinders 22 and 26 are attached to the flange portions 23C and 27C of the cylinders 22 and 26 using the dedicated bolts 62. Before the long bolt 33 is attached, the legs 61 and 64 can be attached to the cylinders 22 and 26 in advance, so that the workability can be improved.

  In the first embodiment, as a part of the circumferential direction of the flange portions 23C, 27C, 30B, and 30C of the cylinders 22, 26, and 29, the cylinders 22 that cannot be reached by work from above are provided. The case where the long bolts 33 are inserted into the four bolt insertion holes 27D, 30D, and 30E located between the cleaning devices 26 and 29 and the purification device mounting base 16 has been described as an example.

  However, the present invention is not limited to this. For example, as in a modification shown in FIG. 22, the flanges 23C, 27C, 30B, and 30C of the cylindrical bodies 22, 26, and 29 are arranged at the bottom as part of the circumferential direction. It is good also as a structure which inserts the long volt | bolt 33 in the bolt insertion hole 71 located. Moreover, it is good also as a structure which arrange | positions the long volt | bolt 33 to the upper side from the intermediate part of each cylinder 22,26,29. Furthermore, 9 or less or 11 or more bolt insertion holes 27D, 30D, and 30E may be provided. These configurations can be similarly applied to other embodiments.

  Moreover, in each embodiment, the filter cylinder 29 which accommodated the particulate matter removal filter 31 which removes the particulate matter (PM) contained in exhaust gas as a process member as a purification | cleaning part cylinder of an exhaust-gas processing apparatus is used. Explained with an example. However, the present invention is not limited to this. For example, in the purification section cylinder, other processing members such as a NOx purification device and a three-way catalyst that purify nitrogen oxide (NOx) contained in the exhaust gas using a urea aqueous solution. It is good also as a structure which accommodates. Moreover, the purification | cleaning part cylinder body is good also as a structure connected and arrange | positioned in the axial direction.

  Furthermore, in each embodiment, the case where the exhaust gas purification device 21 is mounted on the hydraulic excavator 1 including the crawler type lower traveling body 2 has been described as an example. However, the present invention is not limited to this, and may be configured to be mounted on a hydraulic excavator including a wheel-type lower traveling body made of, for example, a tire. Besides, it can be widely mounted on other construction machines such as lift trucks and hydraulic cranes.

1 is a front view showing a hydraulic excavator provided with an exhaust gas purification device according to a first embodiment of the present invention. It is a top view which expands and shows an upper revolving body in the state which omitted the cab and the building cover. FIG. 3 is an enlarged plan view showing a main part of the exhaust gas purifying apparatus in FIG. 2 in an enlarged manner. FIG. 4 is an enlarged cross-sectional view of a main part of an engine, a hydraulic pump, a partition member, and an exhaust gas purification device viewed from the direction of arrows IV-IV in FIG. 3. It is sectional drawing of the principal part expansion which looked at the attachment and removal operation | work of a long volt | bolt using a socket wrench from the arrow VV direction in FIG. It is a longitudinal cross-sectional view which shows the internal structure of an exhaust-gas purification apparatus. FIG. 7 is a cross-sectional view of the exhaust gas purification device as seen from the direction of arrows VII-VII in FIG. 6. It is an external appearance perspective view which shows the exhaust-gas purification apparatus in the state which attached and removed the long volt | bolt to the flange part of each cylinder. It is the disassembled perspective view which looked at the state which removed the filter cylinder from the upstream cylinder and the downstream cylinder from the same position as FIG. It is a principal part expansion perspective view which expands and shows the connection part of an upstream cylinder and a filter cylinder. It is an external appearance perspective view which shows a elongate bolt alone. It is a principal part expansion perspective view which shows the front leg body by 2nd Embodiment with an upstream cylinder, a filter cylinder, a long volt | bolt, etc. FIG. It is an external appearance perspective view which expands and shows the front leg body in FIG. 12 alone. It is a principal part expansion perspective view which shows the back side leg body by 2nd Embodiment with a downstream cylinder, a filter cylinder, a long volt | bolt, etc. FIG. It is an external appearance perspective view which expands and shows the back side leg body in FIG. 14 alone. It is an external appearance perspective view which shows the front leg body by 3rd Embodiment alone. It is an external appearance perspective view which shows the rear leg body by 3rd Embodiment alone. It is a principal part expansion perspective view which shows the front side leg body by 4th Embodiment with an upstream cylinder, a filter cylinder, a long volt | bolt, etc. It is an external appearance perspective view which expands and shows the front leg body in FIG. 18 alone. It is a principal part expansion perspective view which shows the back side leg body by 4th Embodiment with a downstream cylinder, a filter cylinder, a long volt | bolt, etc. It is an external appearance perspective view which expands and shows the rear leg body in FIG. 20 alone. It is the cross-sectional view which looked at the exhaust-gas purification apparatus by the modification of this invention from the same position as FIG.

Explanation of symbols

1 Hydraulic excavator 2 Lower traveling body (vehicle body)
3 Upper swing body (car body)
8 Engine 8E Exhaust pipe 10 Hydraulic pump 12 Hydraulic oil tank 15 Partition member 16 Purification device mounting base 21 Exhaust gas purification device 22 Upstream cylindrical body 23, 27, 30 Cylindrical member 23A, 27A, 30A Cylindrical portion 23B, 27B Lid portion 23C , 27C, 30B, 30C Flange portion 23D, 27E, 41C, 51C, 61C Nut 23E, 27F Leg 24 Inflow pipe 25 Oxidation catalyst 26 Downstream cylinder 27D, 43C, 53C, 64C, 71 Bolt insertion hole 28 Outflow pipe 29 Filter Cylindrical body (Purifying part cylindrical body)
31 Particulate matter removal filter 32 Short bolt 33 Long bolt 33A Bolt head 33B Male screw 34 Socket wrench (tool)
41, 51, 61 Front leg 43, 53, 64 Rear leg

Claims (5)

An upstream cylinder connected to an exhaust pipe of an engine mounted on the vehicle body, a downstream cylinder disposed axially away from the upstream cylinder and exhausting exhaust gas, and the upstream cylinder and the downstream cylinder And a purifying section cylinder having a processing member for purifying exhaust gas provided therein, and an outflow side end of the upstream cylinder, an inflow end of the downstream cylinder, and a purifying section cylinder In the exhaust gas purification apparatus configured to provide a flange portion that is radially expanded in the end portion on the inflow side and the outflow side of
The upstream cylindrical body, the downstream cylindrical body and the flange portion of the purification unit cylindrical body are provided with a plurality of bolt insertion holes at intervals in the circumferential direction,
A long bolt having a length dimension for fastening the flange portion of the upstream cylinder body and the flange portion of the downstream cylinder body with the purification section cylinder interposed therebetween, one end being a bolt head and the other end being a male screw. ,
By inserting the long bolts into the bolt insertion holes and fastening the male screw to nuts with the purification section cylinder sandwiched between the upstream cylinder and the downstream cylinder, An exhaust gas purifying device characterized in that the body is fixed together.   The exhaust gas purifying apparatus according to claim 1, wherein the long bolt is configured to be inserted into a bolt insertion hole located at a position in a circumferential direction of the flange portion among the bolt insertion holes.   The exhaust gas purifying device according to claim 2, wherein the bolt insertion hole located in a part of the circumferential direction of each flange portion is provided in a straight line with respect to each flange portion.   The exhaust gas purifying device according to claim 1, 2 or 3, wherein the nut is configured to be fixedly provided on a flange portion of the upstream cylindrical body.   The flange portion of the upstream cylinder body and the flange portion of the downstream cylinder body are provided with legs for attaching the upstream cylinder body and the downstream cylinder body to the vehicle body side or the engine side, and the nut is fixed to the leg body. The exhaust gas purifying device according to claim 1, 2 or 3, wherein the exhaust gas purifying device is provided.

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