JP5179286B2 - Exhaust gas purification device - Google Patents

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 swing body is equipped with an engine for driving a hydraulic pump at the rear of the swing frame, and a cab, a fuel tank, a hydraulic oil tank, and the like are mounted on the front side of the swing frame.

  Here, a diesel engine is generally used as an engine of a hydraulic excavator. This diesel engine is supposed to discharge harmful substances such as particulate matter (PM) and nitrogen oxides (NOx). Therefore, the hydraulic excavator has a configuration in which an exhaust gas purification device is provided in an exhaust pipe that forms an exhaust gas passage of the engine.

  This exhaust gas purification device collects particulate matter in exhaust gas and removes it (usually called Diesel Particulate Filter, also called DPF for short), nitrogen oxide (NOx). A processing member such as a NOx purification device that purifies using an aqueous urea solution, an oxidation catalyst that oxidizes and removes carbon monoxide (CO), and hydrocarbons (HC) is provided (see, for example, Patent Document 1).

JP 2003-120277 A

  Further, an exhaust gas purifying device according to Patent Document 1 is connected in series between a cylinder disposed upstream, for example, in a flow direction of exhaust gas of an engine, a cylinder disposed downstream, and the cylinders. And a cylindrical body containing a processing member such as a particulate matter removal filter, a NOx purification device, and an oxidation catalyst. And these cylinders are attached to structures, such as an engine provided in the upper revolving body, in the state where it was connected using means, such as flange connection.

  Here, since the particulate matter removal filter collects particulate matter in the exhaust gas, it is necessary to perform a cleaning operation for periodically removing the particulate matter collected and accumulated. In this removal operation, the cylinder containing the particulate matter removal filter is attached and detached. In addition, a cylindrical body containing a NOx purification device, an oxidation catalyst, and the like is also attached and detached for periodic inspection, maintenance, and the like.

  However, in the exhaust gas purifying apparatus according to Patent Document 1 described above, the cylindrical body containing the particulate matter removal filter and the like is attached to the engine using U-bolts and nuts. In addition to removing the bolts, clamps, etc., the U-bolts and nuts fixing the particulate matter removal filter to the engine side must be removed. For this reason, there is a problem that it takes time to remove and attach the particulate matter removing filter and the like. In addition, when the cylinders are fitted with seals, it is necessary to largely shift the upstream and downstream cylinders in the axial direction in order to detach the cylinder containing the particulate matter removal filter and the like. The workability will be further deteriorated.

  Further, when the processing member is a NOx purification device, it is necessary to periodically remove deposits deposited from the urea aqueous solution attached to the urea injection valve, the reduction catalyst, etc., and the above-mentioned particulate matter removal filter and the like are accommodated. As in the case of attaching and detaching the cylindrical body, it takes time to remove and attach.

  Further, since the upstream cylinder and the downstream cylinder are not fixed to the engine, the upstream cylinder and the downstream cylinder from the cylinder containing the particulate matter removal filter, the urea injection valve, the reduction catalyst, etc. When the cylinders are cut off, these cylinders may not be able to stand on their own and may fall down, resulting in a problem that workability at the time of assembling work is deteriorated.

  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 perform only a cylinder body that removes particulate matter and adhering substances from a purification part cylinder body that includes a processing member with a simple operation. It is an object of the present invention to provide an exhaust gas purifying apparatus that can be removed and that can easily perform a cleaning operation, an inspection operation, a repair operation, and the like of a processing member.

Exhaust gas purifying device according to the present invention, the upstream cylinder having an inlet pipe of the exhaust gas is provided upstream of the exhaust gas passage of an engine mounted on the vehicle body, provided on the downstream side of the exhaust gas passage exhaust A downstream cylinder having a gas outflow pipe, and one or the like, which is connected in series between the upstream cylinder and the downstream cylinder and has a processing member for purifying exhaust gas therein. A plurality of purification section cylinders, the purification section cylinder including a filter cylinder containing a particulate matter removal filter that traps particulate matter inside, and an oxidation catalyst cylinder containing an oxidation catalyst inside. One or a combination of a reduction catalyst cylinder containing a selective reduction catalyst for reducing NOx and an injection valve cylinder containing a urea water injection valve for injecting urea water.

In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that the upstream cylinder body, the downstream cylinder body, and the purification section cylinder body are connected to each other so as to face each other. A flange portion having a flat connection surface is provided on the portion, and the purification unit cylinder is connected in series between the upstream cylinder and the downstream cylinder, so that the flange portion between the two cylinders facing each other Is configured to be fastened by a fastening member so that it can be disassembled from each other, and provided with a pressure extraction portion for taking out the pressure of exhaust gas flowing through the exhaust gas passage in the upstream cylinder and the downstream cylinder, and a temperature sensor for measuring temperature mounting opening is provided on the upstream cylinder, and wherein the upstream cylinder and the downstream cylinder, provided a support member for mounting fixedly them to the support bracket provided on each of the engine side, the upstream cylinder Body and downstream cylinder In a state where the fixedly attached to the racket, the purifier part cylinder, by adopting a configuration to mount by the fastening member is connected between the upstream cylinder and the downstream cylinder, the upstream cylinder and the downstream cylinder without removing the body from the support bracket, in that it made it possible to decompose and remove only the purifying part cylinder.

According to a second aspect of the present invention, the flange portion of the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder is provided with a notch portion that prevents rolling when the fastening member is removed. It is in that.

According to a third aspect of the present invention, the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder are provided with a handle portion that is used when removing the fastening member and lifting the cylinder. is there.

According to a fourth aspect of the present invention, an oxidation catalyst and / or a silencer cylinder is provided inside the upstream cylinder and the downstream cylinder.

According to a fifth aspect of the present invention, the support member is a support leg that is provided on the cylindrical body and fixed to the engine side .

According to a sixth aspect of the present invention, the support member includes a U bolt that surrounds the cylindrical body and a nut that fastens the U bolt to the engine side .

The invention of claim 7 is that the fastening member is a bolt and a nut for fastening the flange portions facing each other.

According to an eighth aspect of the present invention, the fastening member is a substantially V-shaped clamp that surrounds and fastens the facing flange portions.

According to the first aspect of the present invention, the upstream cylindrical body, the downstream cylindrical body, and the purification section cylindrical body face the flat connection surfaces of the flange portions provided at the respective end portions, and between the flange portions facing each other in this state Can be fastened by a fastening member. Thus the upstream cylinder among the cylindrical body has concluded and the downstream cylinder body, these because each is provided with a support member for mounting fixedly to the support bracket provided on the engine side, these cylindrical body Can be fixedly supported on the engine side using a support member.

Here, the cylindrical body which is fixedly supported on the engine side by the support member is upstream cylinder and the downstream cylinder. Thereby, the purification | cleaning part cylinder (For example, the cylinder for filters, the cylinder for reduction catalysts, the cylinder for injection valves ) is not fixedly supported by the said engine side.

Accordingly, the purifying part cylinder (for example, the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder) removes the fastening members that fasten the flanges to the flanges of the adjacent cylinders. Accordingly, without detaching the upstream cylinder and the downstream cylinder from the support bracket, in a state fixed to the engine side, it is possible to decompose and remove only the purifying part cylinder.

As a result, when performing periodic cleaning work, inspection work, repair work, etc., the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder need only perform a simple operation of loosening the fastening member. The upstream cylinder and the downstream cylinder can be removed while remaining on the engine side, and the workability such as cleaning, inspection, and repair can be improved.

Moreover, since the flange part provided in the upstream cylinder body, the downstream cylinder body, and the edge part of the purification | cleaning part cylinder body has formed the connection surface as a flat surface, the purification | cleaning part cylinder body (for example, a filter cylinder, a reduction catalyst) The cylinder for injection and the cylinder for injection valve ) can be easily removed by simply loosening the fastening member and lifting it upward without shifting the upstream cylinder, downstream cylinder, etc. in the axial direction.

Moreover, provided the pressure outlet portion for taking out the pressure of the exhaust gas flowing through the exhaust gas passage and the upstream cylinder and the downstream cylinder, the temperature sensor installation opening for measuring the temperature of the exhaust gas, the upstream cylinder Provided. Therefore, the pipe, wiring, etc. from the pressure sensor and temperature sensor are not connected to the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder of the purification unit cylinder. Therefore, only the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder can be easily removed.

According to the invention of claim 2 , since the notch is provided in the flange portion of the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder, the notch is grounded to the mounting surface. These cylinders can be prevented from rolling and can be stably placed on the mounting surface.

According to the invention of claim 3 , since the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder are provided with the handle, the cylinder can be easily and safely held by gripping the handle. And can be easily transported to a work place where cleaning work, inspection work, repair work, etc. are performed.

According to invention of Claim 4 , an oxidation catalyst can be provided in the inside using an upstream cylinder and a downstream cylinder. When an oxidation catalyst is provided, hydrocarbon (HC) and carbon monoxide (CO) in the exhaust gas can be oxidized and removed. Moreover, a silencer cylinder can be provided in the inside using the upstream cylinder and the downstream cylinder, and noise due to exhaust can be reduced.

According to the invention of claim 5 , since the support member is a support leg provided on the cylinder and fixed to the engine side , any one of the upstream cylinder, the downstream cylinder, and the oxidation catalyst cylinder is supported by the support leg. Can be fixed to the engine side .

According to the invention of claim 6 , since the support member is constituted by the U bolt that surrounds the cylinder and the nut that fastens the U bolt to the engine side , the upstream cylinder, the downstream cylinder, and the oxidation Any one of the catalyst cylinders can be fixed to the engine side using a U bolt and a nut.

According to the invention of claim 7 , since the fastening members are bolts and nuts that fasten the facing flange portions, by passing the bolts through the facing flange portions, and screwing the nuts to the bolts, Two adjacent cylinders can be connected in series.

According to the invention of claim 8 , since the fastening member is a clamp having a substantially V shape such as a V shape, a U shape, a U shape, an arc shape and the like that surrounds and fastens each facing flange portion. The two adjacent cylinders can be connected in series by tightening a substantially V-shaped clamp surrounding the periphery of each flange portion.

  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.

  First, FIG. 1 thru | or FIG. 9 has shown the 1st Embodiment of this invention. In the first embodiment, the particulate matter removal device (hereinafter referred to as PM removal device) that removes particulate matter (PM) discharged from the engine as an exhaust gas purification device by a particulate matter removal filter (DPF). Is illustrated.

  The exhaust gas removing apparatus used in the first embodiment includes an upstream cylinder containing the oxidation catalyst and the silencer cylinder, a downstream cylinder containing the silencer cylinder, and a particulate matter removal filter. Three cylinders with the accommodated filter cylinder are connected in series using bolts and nuts, and are attached to the engine side with support legs.

  In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine used for earth and sand excavation work. This hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2 and is mounted on the lower traveling body 2 through a turning device 3 so as to be capable of turning, and an upper revolving body that forms a vehicle body with the lower traveling body 2. 4 and a work device 5 provided on the front side of the upper swing body 4 so as to be able to move up and down. The upper swing body 4 is roughly constituted by a swing frame 6, a cab 7, an engine 8, an exhaust gas purification device 21, and the like which will be described later.

  Reference numeral 6 denotes a turning frame of the upper turning body 4, and the turning frame 6 is mounted on the lower traveling body 21 via the turning device 3. Further, as shown in FIG. 2, the revolving frame 6 is provided with a thick bottom plate 6A extending in the front and rear directions, and standing on the bottom plate 6A, and extends in the front and rear directions with a predetermined interval in the left and right directions. Left vertical plate 6B, right vertical plate 6C, a plurality of extended beams 6D extending outwardly in the left and right directions from the respective vertical plates 6B and 6C, and each of the extended beams positioned outside in the left and right directions. A left side frame 6E and a right side frame 6F, which are attached to the tip of the beam 6D and extend in the front and rear directions, are roughly configured.

  Reference numeral 7 denotes a cab (see FIG. 1) mounted on the left front side of the revolving frame 6. The cab 7 is used by an operator. Inside the cab 7, a driver's seat on which an operator is seated, various operation levers (none of which are shown), and the like are disposed.

  Reference numeral 8 denotes an engine mounted horizontally on the rear side of the revolving frame 6. The engine 8 is configured as a diesel engine, for example. Further, as shown in FIG. 2, an exhaust pipe 9 that forms part of an exhaust gas passage for exhaust gas is provided on the right side of the engine 8, and an exhaust gas purification device 21 (to be described later) is provided in the exhaust pipe 9. Installed.

  Although the diesel engine 8 is highly efficient and excellent in durability, harmful substances such as particulate matter (PM), nitrogen oxide (NOx), and carbon monoxide (CO) are exhaust gas. It will be discharged together. Therefore, the exhaust gas purification device 21 attached to the exhaust pipe 9 includes an oxidation catalyst 25 that oxidizes and removes carbon monoxide (CO) and the like, and a particulate matter removal filter 34 that collects and removes particulate matter. It is configured to include.

  A hydraulic pump 10 is attached to the right side of the engine 8, and the hydraulic pump 10 is driven by the engine 8 to discharge pressure oil (working oil) toward a control valve (not shown). is there. Here, as shown in FIGS. 3 and 4, the hydraulic pump 10 has a flange portion 10 </ b> A at the left end facing the engine 8, and the flange portion 10 </ b> A is bolted to the engine 8. Further, when the flange portion 10A of the hydraulic pump 10 is attached to the engine 8, a purifier support bracket 16 described later is attached together.

  Reference numeral 11 denotes a heat exchanger provided on the left side of the engine 8. The heat exchanger 11 is configured such that, for example, a radiator, an oil cooler, an intercooler, and the like are arranged side by side in the front and rear directions.

  A hydraulic oil tank 12 is located on the front side of the hydraulic pump 10 and is mounted on the right side of the revolving frame 6. The hydraulic oil tank 12 stores hydraulic oil supplied to the hydraulic pump 10. Reference numeral 13 denotes a fuel tank provided on the front side of the hydraulic oil tank 12, and this fuel tank 13 stores fuel supplied to the engine 8 therein.

  Reference numeral 14 is a counterweight located on the rear side of the engine 8 and attached to the rear end of the revolving frame 6. The counterweight 14 balances the weight of the work device 5. Reference numeral 15 denotes a building cover that covers the engine 8 and the like.

  A purification device support bracket 16 is provided on the right side of the engine 8, and the purification device support bracket 16 constitutes a structure on the upper swing body 4 side that supports an exhaust gas purification device 21 described later. . The purifying device support bracket 16 is disposed on the support base 16A with the flange 10A of the hydraulic pump 10 together with the flange portion 10A. The front mounting plate 16C and the rear mounting plate 16D, which are supported in a vibration-proof manner via members 16B (only two are shown), are roughly configured.

  Next, an exhaust gas purification apparatus 21 according to the first embodiment that removes and purifies harmful substances contained in the exhaust gas of the engine 8 will be described with reference to FIGS. The feature of the first embodiment resides in that the PM removing device constituting the exhaust gas purifying device is constituted by an oxidation catalyst 25 and a particulate matter removing filter 34 which will be described later.

  That is, 21 is an exhaust gas purification device that is located on the upper right side of the engine 8 and is connected to the exhaust pipe 9. The exhaust gas purification device 21 constitutes an exhaust gas passage together with the exhaust pipe 9, and from upstream to downstream. During this period, the harmful substances contained in the exhaust gas are removed. Further, the exhaust gas purifying device 21 is arranged vertically in the upper part of the engine 8 so that the front side in the front and rear directions is the upstream side and the rear side is the downstream side.

  As shown in FIGS. 3 and 4, the exhaust gas purification device 21 according to the first embodiment includes an upstream cylinder 22, a downstream cylinder 28, and a filter cylinder 32 as a purification unit cylinder, which will be described later. These three cylinders are configured to be fastened by bolts 35 and nuts 36. Further, as shown in FIG. 6, the upstream cylinder 22 houses the silencer cylinder 24 </ b> B of the inflow pipe 24 and the oxidation catalyst 25, and the downstream cylinder 28 has the silencer cylinder 30 </ b> B of the outflow pipe 30. The particulate matter removal filter 34 is accommodated in the filter cylinder 32 provided so as to be removable.

  Reference numeral 22 denotes an upstream cylinder provided at a front side position of the exhaust gas purification device 21 on the upstream side of the exhaust gas passage, and the upstream cylinder 22 constitutes an inlet portion into which exhaust gas flows. That is, as shown in FIGS. 5 to 7, the upstream cylindrical body 22 is roughly constituted by a cylindrical case 23, an inflow pipe 24, an oxidation catalyst 25, and a support leg 26.

  Reference numeral 23 denotes a cylindrical case constituting the outer shape of the upstream cylindrical body 22, and the cylindrical case 23 is provided by closing a large cylindrical cylindrical portion 23A and the front side (upstream side) of the cylindrical portion 23A. The lid portion 23B and a flange portion 23C provided with an enlarged diameter at the rear (downstream) end of the cylindrical portion 23A.

  Here, as shown in FIG. 6 and the like, the flange portion 23C is connected so as to face the front flange portion 33B of a cylindrical case 33 constituting a later-described filter cylinder 32 adjacent to the rear side. The connection surface 23C1 is formed flat. As a result, the flange portion 23C is configured to lift and remove the filter cylinder 32 upward in the radial direction when the bolts 35 and nuts 36 described later are removed and the fastening is released. A plurality of bolt insertion holes 23D are provided in the flange portion 23C of the cylindrical case 23 at intervals in the circumferential direction, and bolts 35 are inserted into the respective bolt insertion holes 23D.

  Further, as shown in FIGS. 3 and 4, the cylindrical case 23 is provided with two temperature sensor attachment ports 23 </ b> E located at the upper part of the cylindrical portion 23 </ b> A. The two temperature sensor attachment ports 23E are for attaching a temperature sensor 38 for measuring the temperature of an upstream portion and a downstream portion of the oxidation catalyst 25, which will be described later, and are arranged at positions sandwiching the oxidation catalyst 25 in the front and rear directions. ing. Further, the upstream side pressure extraction portion 23F, for example, located on the right side is provided at the rear side position of the cylindrical portion 23A. This is used to extract the pressure on the upstream side of the substance removal filter 34 and is connected to a pressure sensor 37 described later via an upstream pipe 37A.

  Reference numeral 24 denotes an inflow pipe provided on the front side (upstream side) of the cylindrical case 23, and the inflow pipe 24 penetrates the cylindrical portion 23 </ b> A of the cylindrical case 23 in the diameter direction. One end of the inflow pipe 24 is connected to the exhaust pipe 9 and extends to the left side toward the exhaust pipe 9. On the other hand, the other end of the inflow pipe 24 is closed by a closing plate 24A. Here, the inflow pipe 24 constitutes a silencer cylinder 24 </ b> B inside the cylindrical case 23. The silencer cylinder 24B reduces exhaust noise by passing exhaust gas through a plurality of small holes 24B1.

Reference numeral 25 denotes an oxidation catalyst positioned in the downstream side of the inflow pipe 24 and accommodated in the cylindrical case 23. The oxidation catalyst 25 constitutes one of the processing members for purifying the exhaust gas. Further, as shown in FIGS. 6 and 7, the oxidation catalyst 25 is formed of a ceramic cell-like cylindrical body having an outer diameter dimension equivalent to the inner diameter dimension of the cylindrical portion 23A, for example. A through hole 25A is formed, and the inner surface is coated with a noble metal or the like. The oxidation catalyst 25 oxidizes and removes carbon monoxide (CO), hydrocarbons (HC), etc. contained in the exhaust gas by causing the exhaust gas to flow through each through hole 25A at a predetermined temperature. Nitrogen oxide (NO) is removed as nitrogen dioxide (NO ₂ ).

  Reference numeral 26 denotes a support leg as a support member provided on the lower side of the cylindrical portion 23A of the upstream cylinder 22, and the support leg 26 is, as shown in FIG. Is fixedly attached to the front mounting plate 16C of the purification device support bracket 16. The support legs 26 according to the first embodiment are formed in a substantially W shape by bending a plate, but may have other shapes such as an L shape and an inverted T shape. .

  Reference numeral 27 denotes two positioning plates (see FIG. 7) provided on the flange portion 23C of the cylindrical case 23. The positioning plates 27 are arranged at the rear side of the flange portion 23C at a predetermined interval on the rear side. Installed to protrude. Each positioning plate 27 is brought into contact with a front flange portion 33B of a cylindrical case 33 constituting a filter cylinder 32, which will be described later, so that the cylindrical case 33 of the filter cylinder 32 is placed upstream. It is positioned at a position that is substantially coaxial with the cylindrical body 22.

  Reference numeral 28 denotes a downstream cylinder provided at a rear position of the exhaust gas purifying device 21 on the downstream side of the exhaust gas passage. The downstream cylinder 28 is located on the opposite side of the upstream cylinder 22 and is located in the exhaust gas. The outlet part that flows out is constituted. That is, as shown in FIGS. 5 and 6, the downstream cylinder 28 is roughly constituted by a cylindrical case 29, an outflow pipe 30, and a support leg 31.

  Reference numeral 29 denotes a cylindrical case constituting the outer shape of the downstream cylindrical body 28. The cylindrical case 29 is substantially similar to the cylindrical case 23 of the upstream cylindrical body 22, and has a large cylindrical cylindrical portion 29A and the cylindrical case. The lid portion 29B is provided by closing the rear side (downstream side) of the portion 29A, and the flange portion 29C is provided by expanding the diameter at the front side (upstream side) end portion of the cylindrical portion 29A. Yes.

  Here, the flange portion 29C of the cylindrical case 29 is substantially the same as the flange portion 23C of the cylindrical case 23 of the upstream cylindrical body 22 described above, and a cylindrical case constituting a filter cylinder 32 described later adjacent to the front side. A connection surface 29C1 with the rear flange portion 33C of 33 is formed flat. The flange portion 29C is provided with a plurality of bolt insertion holes 29D at intervals in the circumferential direction.

  On the other hand, at the rear side position of the cylindrical portion 29A, for example, a downstream pressure extraction portion 29E is provided, which is located on the right side. The pressure at the downstream side of the substance removal filter 34 is taken out, and is connected to a pressure sensor 37 to be described later via a downstream pipe 37B.

  Reference numeral 30 denotes an outflow pipe called a tail pipe provided in the cylindrical case 29, and the outflow pipe 30 penetrates the cylindrical portion 29 </ b> A of the cylindrical case 29 upward and downward in the diametrical direction. As shown in FIG. 6, the lower end of the outflow pipe 30 is closed by a closing plate 30A, and the upper end of the outflow pipe 30 protrudes upward and is released to the atmosphere. Here, the outflow pipe 30 constitutes a silencer cylinder 30 </ b> B inside the cylindrical case 29. The silencer cylinder 30B reduces exhaust noise by passing a large number of exhaust gases through small holes 30B1 in the same manner as the silencer cylinder 24B of the inflow pipe 24 described above.

  Reference numeral 31 denotes a support leg as a support member provided on the lower side of the cylindrical portion 29A of the downstream cylindrical body 28. The support leg 31 is formed in a substantially W shape like the support leg 26 described above. The support legs 31 are used to fix the downstream cylinder 28 to the rear mounting plate 16D of the purification device support bracket 16 by using bolts and nuts 40.

  Here, the upstream cylinder 22 can be attached to the front attachment plate 16C of the purification device support bracket 16 by the support leg 26, and the downstream cylinder 28 is attached to the rear attachment plate of the purification device support bracket 16 by the support leg 31. 16D can be attached. In this state, a space for attaching a filter cylinder 32 described later can be formed between the upstream cylinder 22 and the downstream cylinder 28.

  Reference numeral 32 denotes one filter cylinder provided in series between the upstream cylinder 22 and the downstream cylinder 28. The filter cylinder 32 includes a purification section cylinder having a processing member built therein. It is composed. Further, as shown in FIGS. 7 and 8, the filter cylinder 32 is roughly constituted by a cylindrical case 33 and a particulate matter removing filter 34 which will be described later. The filter cylinder 32 is different from the upstream cylinder 22 and the downstream cylinder 28 in that no support legs are provided.

  Reference numeral 33 denotes a cylindrical case constituting the outer shape of the filter cylinder 32. The cylindrical case 33 includes a cylindrical cylindrical portion 33A having a diameter similar to that of the cylindrical case 23 of the upstream cylinder 22; The front flange portion 33B provided with an enlarged diameter at the front (upstream) end portion of the cylindrical portion 33A and the enlarged diameter provided at the rear (downstream) end portion of the cylindrical portion 33A It is comprised by the side flange part 33C.

  In the PM removing device according to the first embodiment, the cylindrical case 33 of the filter cylinder 32 is different from the cylindrical case 23 of the upstream cylinder 22 and the cylindrical case 29 of the downstream cylinder 28, Instrument mounting parts such as temperature sensor mounting port and pressure take-out part are not provided.

  Here, the front side flange portion 33B of the cylindrical case 33 faces the connection surface 23C1 of the flange portion 23C provided on the cylindrical case 23 of the upstream cylindrical body 22 adjacent to the front side by a flat connection surface 33B1. The front flange portion 33B is provided with a plurality of bolt insertion holes 33D at positions corresponding to the bolt insertion holes 23D. Similarly, the rear flange portion 33C faces the connection surface 29C1 of the flange portion 29C provided on the cylindrical case 29 of the downstream cylindrical body 28 adjacent to the rear side by a flat connection surface 33C1. The rear flange portion 33C is provided with a plurality of bolt insertion holes 33D at positions corresponding to the bolt insertion holes 29D.

  Thereby, the cylindrical case 33 can be removed and disassembled as a single product without removing the adjacent upstream cylindrical body 22 and downstream cylindrical body 28 from the purification device support bracket 16. Further, the cylindrical case 33 can be assembled by being connected between the upstream cylindrical body 22 and the downstream cylindrical body 28.

  Furthermore, as shown in FIGS. 7 and 9, a notch 33 </ b> E is provided in the lower portion of each flange portion 33 </ b> B, 33 </ b> C. The notch 33E is cut out, for example, as a flat surface to prevent rolling when the below-described bolt 35 and nut 36 are removed and the filter cylinder 32 is placed. Note that the notch 33E is intended to stably mount the removed filter cylinder 32, and therefore may have another shape such as a gentle V-shape or U-shape.

  Reference numeral 34 denotes a particulate matter removal filter (usually called Diesel Particulate Filter, abbreviated as DPF) accommodated in the cylindrical case 33. The particulate matter removal filter 34 constitutes one of the processing members. doing. The particulate matter removal filter 34 purifies the exhaust gas by collecting particulate matter (PM) in the exhaust gas discharged from the engine 8 and burning and removing it. Further, the particulate matter removal filter 34 has a cellular cylindrical body in which a large number of small holes 34A are provided in the axial direction in a porous member made of, for example, a ceramic material, and the small holes 34A are alternately arranged next to each other. Different ends are blocked by the sealing member 34B.

  Thereby, the particulate matter removal filter 34 collects the particulate matter by passing the exhaust gas flowing into the small hole 34A from one side through the porous material, and flows out from the adjacent small hole 34A to the other. The collected particulate matter is burned and removed, but a part of it becomes ashes and gradually accumulates in the small holes 34A. In addition, other unburned residues such as heavy metals and calcium in the engine oil are gradually deposited. Therefore, the particulate matter removal filter 34 needs to be removed and cleaned when the pressure difference reaches a predetermined value by measuring the pressure on the upstream side and the pressure on the downstream side by a pressure sensor 37 described later. There is.

  In addition, since the particulate matter removing filter 34 is disposed in the substantially central portion of the cylindrical case 33 in the axial direction, it is not necessary to determine upstream and downstream when attaching. Thereby, the incorrect assembly | attachment of the cylinder 32 for filters can be prevented. Further, it is possible to positively reverse the assembly direction of the filter cylinder 32 and use it.

  35 is a bolt provided between the upstream cylinder 22 and the filter cylinder 32 and between the downstream cylinder 28 and the filter cylinder 32, and 36 is a nut screwed to the bolt 35, respectively. The bolt 35 and the nut 36 constitute a fastening member.

  That is, the bolt 35 is provided in the bolt insertion hole 23 </ b> D provided in the flange portion 23 </ b> C that forms the cylindrical case 23 of the upstream cylindrical body 22 and the front flange portion 33 </ b> B that forms the cylindrical case 33 of the filter cylinder 32. By inserting the nut 36 into the bolt insertion hole 33D and screwing the nut 36 onto the protruding screw portion, the flange portions 23C and 33B can be fastened to each other so as to be disassembled.

  On the other hand, the bolt 35 is provided in the bolt insertion hole 29D provided in the flange 29C that forms the cylindrical case 29 of the downstream cylinder 28 and the rear flange 33C that forms the cylindrical case 33 of the filter cylinder 32. The flanges 23C and 33C can be fastened to each other so that they can be disassembled by being inserted into the bolt insertion holes 33D and screwing the nuts 36 into the protruding screw parts.

  Reference numeral 37 denotes a pressure sensor provided on the outer peripheral side of the upstream cylindrical body 22, and the pressure sensor 37 is disposed upstream of the particulate matter removal filter 34 in order to estimate the accumulation amount of particulate matter, unburned residue, and the like. And a downstream pressure (pressure difference) are detected. The upstream side pipe 37A of the pressure sensor 37 is connected to the pressure extraction part 23F of the cylindrical case 23 of the upstream cylinder 22, and the downstream side pipe 37B is a pressure extraction part 29E of the cylindrical case 29 of the downstream cylinder 28. It is connected to the. Here, as shown in FIGS. 3 and 4, the pipes 37A and 37B are provided at positions avoiding the lateral direction so as not to obstruct when the filter cylinder 32 is attached upward and downward. It has been.

  Reference numeral 38 denotes an upstream temperature sensor provided on the upstream side of the cylindrical case 23 of the upstream cylinder 22. The upstream temperature sensor 38 is attached to a temperature sensor attachment port 23E located on the upstream side of the cylindrical case 23, and is connected to a controller (not shown). The upstream temperature sensor 38 detects the temperature of the exhaust gas flowing into the cylindrical case 23 in order to confirm whether the temperature is such that the oxidation catalyst 25 can function.

  On the other hand, 39 is a downstream temperature sensor provided on the downstream side of the cylindrical case 23 of the upstream cylinder 22, and this downstream temperature sensor 39 confirms whether regeneration by the particulate matter removal filter 34 is possible. In addition, the temperature of the exhaust gas that has passed through the oxidation catalyst 25 is detected.

  The exhaust gas purification device 21 including the PM removal device according to the first embodiment has the above-described configuration. Next, the assembly work will be described.

  First, the flange 23C that forms the cylindrical case 23 of the upstream cylinder 22 and the front flange 33B that forms the cylindrical case 33 of the filter cylinder 32 face each other, and in this state, the bolt insertion holes 23D and 33D. Bolts 35 are inserted into the nuts, and nuts 36 are screwed onto the protruding thread portions.

  Similarly, the flange portion 29C forming the cylindrical case 29 of the downstream cylinder 28 and the rear flange portion 33C forming the cylindrical case 33 of the filter cylinder 32 face each other, and in this state, each bolt insertion hole 23D. , 33D, bolts 35 are inserted, and nuts 36 are screwed onto the protruding thread portions.

  Thereby, the upstream cylinder 22, the downstream cylinder 28, and the filter cylinder 32 can be assembled in series so as to be positioned substantially coaxially. Further, when the bolt 35 and the nut 36 are loosened and removed, they can be disassembled.

  When the exhaust gas purifying device 21 is assembled by the upstream cylindrical body 22, the downstream cylindrical body 28, and the filter cylinder 32, the exhaust gas purifying device 21 is connected to the front mounting plate 16C and the rear mounting plate of the purifying device support bracket 16. Place on 16D. In this state, the support leg 26 of the upstream cylinder 22 is fixed to the front mounting plate 16C using bolts and nuts 40, and the support leg 31 of the downstream cylinder 28 is fixed to the rear mounting plate 16D using bolts and nuts 40. By fixing, the exhaust gas purification device 21 can be attached to the purification device support bracket 16 (engine 8).

  Next, the case where the cleaning operation for removing the particulate matter deposited on the particulate matter removal filter 34 of the filter cylinder 32 is performed will be described.

  In the cleaning operation of the particulate matter removing filter 34, it is necessary to remove the filter cylinder 32. The bolt 35 and the nut 36 for fastening the upstream cylinder 22 and the filter cylinder 32 are removed, and the downstream cylinder 28 and the filter are removed. The bolt 35 and the nut 36 for fastening the cylinder 32 for use are removed. At this time, the filter cylinder 32 is configured to be attached to the upstream cylinder 22 and the downstream cylinder 28 with a flat flange connection without a seal fitting, so that the filter cylinder 32 is upstream by being pulled up. It can be easily removed from between the cylindrical body 22 and the downstream cylindrical body 28.

  Then, the removed filter cylinder 32 is placed on, for example, a workbench, and each flange portion 33B, 33C of the cylindrical case 33 forming the filter cylinder 32 is provided with a notch 33E on the lower side. Therefore, the filter cylinder 32 can be stably placed so as not to fall by grounding the notch 33E to the work table. Thereby, the particulate matter deposited on the particulate matter removal filter 34 in the filter cylinder 32 can be removed using, for example, compressed air.

  Next, the operation (operation) of the excavator 1 to which the first embodiment is applied will be described.

  First, the operator gets on the cab 7 of the upper swing body 4, 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 7 operated the operation lever (not shown) for driving | running | working, the lower traveling body 2 can be moved forward or backward. On the other hand, by operating an operation lever (not shown) for work, the work device 5 can be moved up and down to perform soil excavation work or the like.

  Further, when the engine 8 is in operation, particulate matter, which is a harmful substance, is discharged from the exhaust pipe 9. At this time, the exhaust gas purification device 21 collects the particulate matter by the particulate matter removal filter 34 and burns and removes (regenerates) the collected particulate matter. Thereby, the purified exhaust gas can be discharged to the outside.

  Thus, according to the first embodiment, the flat cases 23C1, 29C1, 33B1, and 33C1 are provided on the cylindrical cases 23, 29, and 33 of the upstream cylinder 22, the downstream cylinder 28, and the filter cylinder 32. The flange portions 23C, 29C, 33B, and 33C are provided, and the facing flange portions 23C, 29C, 33B, and 33C are fastened by bolts 35 and nuts 36. In addition, support legs 26 and 31 for fixing to the purification device support bracket 16 on the engine 8 side are provided on the upstream cylinder 22 and the downstream cylinder 28 excluding the filter cylinder 32.

  Therefore, the upstream cylinder 22 and the downstream cylinder 28 can be fixedly supported on the purification device support bracket 16 using the support legs 26 and 31. On the other hand, the filter cylinder 32 is not fixedly supported by the purification device support bracket 16. As a result, the filter cylinder 32 can be used for a filter that requires a cleaning operation or the like while the upstream cylinder 22, the downstream cylinder 28, etc. are fixed to the vehicle body side by removing the bolts 35 and nuts 36. Only the cylinder 32 can be easily removed.

  As a result, when performing periodic cleaning work, inspection work, repair work, etc., the filter cylinder 32 simply performs the simple work of loosening the bolts 35 and nuts 36, and the upstream cylinder 22 and downstream The cylindrical body 28 can be removed while remaining on the engine 8 side, and workability such as cleaning work, inspection work, and repair work can be improved.

  In addition, since the cylindrical case 23 of the upstream cylinder 22 is provided with two temperature sensor attachment ports 23E and a pressure extraction part 23F, and the pressure extraction part 29E is provided in the cylindrical case 29 of the downstream cylinder 28, the filter It is not necessary to provide the temperature sensor attachment port, the pressure take-out part, etc. in the cylinder 32 for use. Therefore, when removing the filter cylinder 32, it is not necessary to perform the work of removing piping, wiring, etc. from the pressure sensor or temperature sensor, and only the filter cylinder 32 can be easily removed.

  Further, since each flange portion 33B, 33C of the cylindrical case 33 of the filter cylinder 32 is provided with a notch portion 33E extending in the horizontal direction on the lower side, the notch portion 33E is provided on the work table, for example. , The filter cylinder 32 can be prevented from rolling and can be stably placed on the work table.

  Furthermore, a silencer cylinder 24 </ b> B and an oxidation catalyst 25 that form a part of the inflow pipe 24 can be provided inside the upstream cylinder 22. Thereby, noise due to exhaust can be reduced by the silencer cylinder 24B, and the hydrocarbon (HC), nitrogen oxide (NO), and carbon monoxide (CO) in the exhaust gas are oxidized by the oxidation catalyst 25. Can be removed. Further, a silencer cylinder 30B that forms a part of the outflow pipe 30 can be provided inside the downstream cylinder 28, and noise due to exhaust can be further reduced by the silencer cylinder 30B.

  Next, FIG. 10 shows an exhaust gas purifying apparatus according to a second embodiment of the present invention. This embodiment constitutes the particulate matter removing device as in the first embodiment, but its feature is that it is gripped when the fastening member is removed from the filter cylinder and the filter cylinder is lifted. It is in the structure which provides a handle part. 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.

  Reference numeral 41 denotes an exhaust gas purification device according to the second embodiment, and reference numeral 42 denotes a handle portion according to the second embodiment provided in the filter cylinder 32 of the exhaust gas purification device 41. The grip portion 42 is gripped when the filter cylinder 32 is attached and removed. The handle portion 42 is formed by bending a long metal plate into a substantially C shape, for example, and is fixed to the upper portion of the cylindrical portion 33A constituting the cylindrical case 33 using means such as welding and screwing. ing.

  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, since the grip portion 42 is provided to be gripped when the filter cylinder 32 is attached and removed, the filter barrel 32 can be easily held by gripping the grip portion 42. And can be lifted safely. Furthermore, it can be safely transported to a work table for performing various operations.

  Next, FIG. 11 thru | or FIG. 13 has shown the exhaust-gas purification apparatus by the 3rd Embodiment of this invention. This embodiment constitutes a particulate matter removal device as in the first embodiment, but its feature is that the exhaust gas purification device is formed by four cylinders and uses U bolts and nuts. Therefore, it is configured to be fastened to the vehicle body. 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. 11, 51 denotes an exhaust gas purification device according to the third embodiment, and 52 denotes an upstream cylinder located on the upstream side of the exhaust gas purification device 51. The upstream cylinder 52 includes a cylindrical case 53 and an inflow pipe 54 which will be described later.

  53 is a cylindrical case forming the upstream cylindrical body 52. As shown in FIG. 12, the cylindrical case 53 is substantially the same as the cylindrical case 23 according to the first embodiment, and has a cylindrical portion 53A and a lid portion 53B. , A flange portion 53C, a bolt insertion hole (not shown), and the like. However, in the cylindrical case 53 according to the third embodiment, a cylindrical portion 53A is formed in a short length by removing an oxidation catalyst 57 described later, and a notch 53D is formed in the flange portion 53C. This is different from the cylindrical case 23 according to the first embodiment. Here, the notch 53D positions the cylindrical case 53 on the purification device support bracket 16 so that the inflow pipe 54 extends at a correct angle, for example.

  54 is an inflow pipe according to the third embodiment provided in the cylindrical case 53. As shown in FIG. 13, the inflow pipe 54 has a cylindrical shape almost similar to the inflow pipe 24 according to the first embodiment. The case 53 extends in the diameter direction.

  Reference numeral 55 denotes an oxidation catalyst cylinder provided in series between the upstream cylinder 52 and the filter cylinder 32. The oxidation catalyst cylinder 55 constitutes one of the purification section cylinders. ing. The oxidation catalyst cylinder 55 includes a cylindrical case 56 and an oxidation catalyst 57, as shown in FIG.

  Here, the cylindrical case 56 includes a cylindrical portion 56A, a front flange portion 56B, and a rear flange portion 56C, and two temperature sensor attachment ports 56D are provided on the upper portion of the cylindrical portion 56A. Further, a notch 56E similar to the notch 53D of the cylindrical case 53 of the upstream cylinder 52 is formed below the flanges 56B and 56C. On the other hand, the oxidation catalyst 57 is configured in substantially the same manner as the oxidation catalyst 25 according to the first embodiment, and is fixed in the cylindrical portion 56 </ b> A of the cylindrical case 56. Furthermore, since the oxidation catalyst 57 is disposed at the substantially central portion in the axial direction of the cylindrical case 56, it is not necessary to determine upstream and downstream when mounting. Thereby, the incorrect assembly | attachment of the cylinder 55 for oxidation catalysts can be prevented.

  58 indicates a U-bolt provided so as to surround the upstream cylinder 52 and the downstream cylinder 28, and 59 indicates a nut for fastening the U-bolt 58 to the purifier support bracket 16 on the vehicle body side (FIG. 11, FIG. 11). (See FIG. 13). The U bolt 58 and the nut 59 constitute a support member that fixedly supports the exhaust gas purification device 51 to the purification device support bracket 16.

  The U-bolt 58 is provided so as to surround the upstream cylinder 52 and the downstream cylinder 28 from above, and the both ends on which male threads are engraved are passed through the mounting plates 16C and 16D of the purification device support bracket 16. The exhaust gas purifying device 51 can be fixedly supported by the purifying device support bracket 16 by screwing the nut 59 into the protruding portion.

  Thus, also in the third 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 third embodiment, the exhaust gas purifying device 51 is formed by four cylinders including the upstream cylinder 52, the oxidation catalyst cylinder 55, the filter cylinder 32, and the downstream cylinder 28 described above. it can. Further, it can be supported at low cost by using commercially available U-bolts 58 and nuts 59.

  Next, FIG. 14 shows a fourth embodiment of the present invention. In the present embodiment, a particulate matter removing device that collects and removes particulate matter (PM) in exhaust gas, and a nitrogen oxide purifying device that purifies nitrogen oxide (NOx) using a urea aqueous solution ( Hereinafter, a case where the exhaust gas purification device is configured by combining with a NOx purification device) is illustrated.

  That is, the present embodiment is characterized in that, among the exhaust gas purification devices, the PM removal device is composed of the upstream oxidation catalyst 25 and the particulate matter removal filter 34 described above, and the NOx purification device is a urea injection valve 68 described later. And the selective reduction catalyst 71. 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. 14, reference numeral 61 denotes an exhaust gas purifying apparatus according to the fourth embodiment. The exhaust gas purifying apparatus 61 removes PM by the upstream cylinder 22 and the filter cylinder 32 described in the first embodiment. Configure the device. On the other hand, a downstream cylinder 62, an injection valve cylinder 66, and a reduction catalyst cylinder 69, which will be described later, constitute a NOx purification device. The exhaust gas purifying device 61 connects the five cylinders of the upstream cylinder 22, the filter cylinder 32, the downstream cylinder 62, the injection valve cylinder 66, and the reduction catalyst cylinder 69 in series. It is configured.

  First, the PM removal device includes an upstream cylinder 22 that contains an oxidation catalyst 25 that oxidizes and removes carbon monoxide (CO), hydrocarbon (HC), and the like contained in exhaust gas, and particulate matter in the exhaust gas. (PM) is collected, and it is comprised by the cylinder 32 for filters which accommodated the particulate matter removal filter 34 which burns and removes.

  Next, the NOx purification device will be described in detail. This NOx purification device is for an injection valve provided with a downstream cylinder 62 containing a downstream oxidation catalyst 65 and a urea injection valve 68 for injecting a urea aqueous solution. A cylindrical body 66 and a reduction catalyst cylinder 69 containing a selective reduction catalyst 71 that selectively reduces nitrogen oxide (NOx) with ammonia and decomposes it into water and nitrogen.

  That is, 62 is a downstream cylinder located on the downstream side of the exhaust gas purification device 61. This downstream cylinder 62 is substantially the same as the downstream cylinder 28 according to the first embodiment, and the cylindrical case 63 and the outflow pipe. 64. However, the downstream cylindrical body 62 according to the fourth embodiment is the downstream cylinder according to the first embodiment in that the cylindrical case 63 is formed long in the axial direction and the oxidation catalyst 65 is accommodated therein. This is different from the cylindrical body 28.

  Here, as shown in FIG. 14, the oxidation catalyst 65 is made of, for example, a ceramic cell-like cylindrical body having an outer diameter dimension equivalent to the inner diameter dimension of the cylindrical case 63, and has a large number of through holes in the axial direction. A hole 65A is formed, and the inner surface is coated with a noble metal. The oxidation catalyst 65 oxidizes residual ammonia remaining after reducing the nitrogen oxides with a selective reduction catalyst 71 described later, and separates it into nitrogen and water.

  Reference numeral 66 denotes an injection valve cylinder which is flanged in series with the downstream side of the filter cylinder 32. The injection valve cylinder 66 constitutes one of the purification section cylinders. The injection valve cylinder 66 includes a cylindrical case 67 and a urea injection valve 68 that injects a urea aqueous solution toward the exhaust gas in the cylindrical case 67. Here, since the injection valve cylinder 66 adheres to the urea injection valve 68 due to defects in the injection state and crystallization of the urea aqueous solution, it is necessary to remove and clean the adhesion.

  Reference numeral 69 denotes a reduction catalyst cylinder which is flanged in series between the injection valve cylinder 66 and the downstream cylinder 62, and the reduction catalyst cylinder 69 constitutes one of the purification section cylinders. Yes. The reduction catalyst cylinder 69 includes a cylindrical case 70 and a selective reduction catalyst 71 accommodated in the cylindrical case 70.

  Here, the selective reduction catalyst 71 is made of, for example, a ceramic cellular cylinder having an outer diameter equivalent to the inner diameter of the cylindrical case 70, and a large number of through holes 71A are formed in the axial direction thereof. The inner surface is coated with precious metal. The selective reduction catalyst 71 normally causes nitrogen oxide (NOx) contained in the exhaust gas discharged from the engine 8 to selectively reduce with ammonia generated from the urea aqueous solution, and decomposes into nitrogen and water. Is. Further, since deposits and the like due to precipitation of the urea aqueous solution adhere to the selective reduction catalyst 71, it is necessary to remove the reduction catalyst cylinder 69 and clean the deposits of the selective reduction catalyst 71.

  Further, the exhaust gas purifying device 61 according to the fourth embodiment has five cylinders including an upstream cylinder 22, a filter cylinder 32, a downstream cylinder 62, an injection valve cylinder 66, and a reduction catalyst cylinder 69. Are connected in series. Of the upstream cylinder 22, the filter cylinder 32, the downstream cylinder 62, the injection valve cylinder 66, and the reduction catalyst cylinder 69, the upstream cylinder 22 and the downstream cylinder 62 are fixedly supported by the vehicle body. Has been. Further, the filter cylinder 32, the injection valve cylinder 66, and the reduction catalyst cylinder 69 can be easily removed or attached when performing a cleaning operation, an inspection operation, a repair operation, or the like.

  Thus, also in the fourth embodiment configured as described above, the PM removing apparatus can obtain substantially the same operational effects as those of the first embodiment described above. However, in the fourth embodiment, a NOx purification device is combined with a PM removal device, and the NOx purification device is combined with a urea injection valve 68 for injecting a urea aqueous solution and NOx in exhaust gas by ammonia generated from the urea aqueous solution. The exhaust gas can be further purified because it is constituted by the selective reduction catalyst 71 that decomposes by reductive reaction.

  In the fourth embodiment, the PM removing device including the upstream cylinder 22 and the filter cylinder 32, and the NOx purification device including the downstream cylinder 62, the injection valve cylinder 66, and the reduction catalyst cylinder 69 are provided. Constitutes an exhaust gas purifying device 61. However, the present invention is not limited to this configuration. That is, only the NOx purification device may be provided as in the exhaust gas purification device 81 according to the first modification shown in FIG. That is, the exhaust gas purifying device 81 is connected to the four cylinders of the upstream cylinder 22, the downstream cylinder 82, the injection valve cylinder 83, and the reduction catalyst cylinder 84, and the two oxidation catalysts 25 as processing members. , 85, a urea injection valve 86, and a selective reduction catalyst 87 may be provided. In this case, the upstream pipe 22 is provided with the inflow pipe 24, and the downstream cylinder 82 is provided with the outflow pipe 88.

  Further, not only the first modification described above, but also a configuration in which a cylinder (purification unit cylinder) having a processing member built in between the upstream cylinder and the downstream cylinder is connected in series. The number of processing members is not limited to the number, and the processing members can be freely combined.

  In the first embodiment, flange portions 23C, 29C, 33B, and 33C are provided on the cylindrical cases 23, 29, and 33 of the upstream cylinder 22, the downstream cylinder 28, and the filter cylinder 32, and the flanges face each other. The parts 23C, 29C, 33B, and 33C are fastened to each other by a bolt 35 and a nut 36 as fastening members so that they can be disassembled.

  However, the present invention is not limited to this. For example, like the exhaust gas purifying apparatus 91 according to the second modification shown in FIG. 16, the flange portions 23C 'and 33B' and the flange portions 29C 'and 33C' facing each other are provided. A surrounding clamp 92 may be provided, and the clamp 92 may be fastened by fastening with a bolt or the like (not shown). In this case, as the clamp 92, one having a V-shaped, U-shaped, U-shaped, arc shape or the like in cross-section (generally referred to as a substantially V shape) is used. This configuration can be similarly applied to other embodiments.

Further, in the third embodiment, four cylinders of the downstream cylinder 28, the filter cylinder 32, the upstream cylinder 52, and the oxidation catalyst cylinder 55 are connected, and the oxidation catalyst 25 and the particulate form as processing members. The substance removal filter 34 is provided, and the upstream cylinder 52 and the downstream cylinder 28 are supported on the purification device support bracket 16 using U bolts 58 and nuts 59. However, in the first reference example by the exhaust gas purification apparatus 101 shown in FIG. 17 if example embodiment, attaching the support legs 102 each with the downstream cylinder 28 oxidation catalyst accommodating cylinder 55, purifier the two support legs 102 It is configured to be attached to the support bracket 16.

Further, in the exhaust gas purifying apparatus 111 according to the second reference example shown in FIG. 18 , the downstream cylinder 28, the filter cylinder 32, the upstream cylinder 112, the oxidation catalyst cylinder 113, the injection valve cylinder 114, the reduction cylinder The six cylinders of the catalyst cylinder 115 are connected, the support legs 116 are respectively attached to the downstream cylinder 28 and the oxidation catalyst cylinder 113, and the two support legs 116 are attached to the purifier support bracket 16. Yes .

  On the other hand, in the first embodiment, the inflow pipe 24 of the upstream cylinder 22 is connected to the cylindrical case 23 in the diametrical direction, and the outflow pipe 30 of the downstream cylinder 28 is diametrically connected to the cylindrical case 29. The case of connecting to is described as an example. However, the present invention is not limited to this, and the inflow pipe may be connected to the cylindrical case in the axial direction. Further, the outflow pipe may be connected to the cylindrical case in the axial direction. These configurations can be similarly applied to other embodiments.

  Moreover, in 2nd Embodiment, the case where the handle part 42 was provided in the cylinder 32 for filters was illustrated. However, the present invention is not limited to this. For example, in the fourth embodiment, the handle portion 42 may be provided in the injection valve cylinder 66 and the reduction catalyst cylinder 69.

  Furthermore, in each embodiment, the case where the exhaust gas purification devices 21, 51, 61 are 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. It is a perspective view of the principal part expansion shown in the state where the exhaust gas purification apparatus by 1st Embodiment was attached to the engine. 1 is a front view showing an exhaust gas purification device according to a first embodiment together with a hydraulic pump. It is a perspective view which expands and shows an exhaust-gas purification apparatus. It is a longitudinal cross-sectional view which shows the internal structure of an exhaust-gas purification apparatus. It is a perspective view which shows the state which removed the cylinder for filters from the upstream cylinder and the downstream cylinder. It is the cross-sectional view of the principal part expansion which looked at the state which attached the upstream cylinder to the purification apparatus support bracket from the arrow VIII-VIII direction in FIG. It is a right view which expands and shows the cylinder for filters. It is a perspective view which shows the exhaust-gas purification apparatus by the 2nd Embodiment of this invention. FIG. 6 is a perspective view showing an exhaust gas purification device according to a third embodiment of the present invention attached to an engine. It is a longitudinal cross-sectional view which shows the internal structure of an exhaust-gas purification apparatus. FIG. 13 is an enlarged cross-sectional view of a main part when the upstream cylinder is attached to the purification device support bracket as viewed from the direction of arrows XIII-XIII in FIG. 11. It is sectional drawing which shows the exhaust-gas purification apparatus by the 4th Embodiment of this invention. It is sectional drawing which shows the exhaust-gas purification apparatus by the 1st modification of this invention. It is sectional drawing which shows the exhaust-gas purification apparatus by the 2nd modification of this invention. It is sectional drawing which shows the exhaust-gas purification apparatus by the 1st reference example of this invention. It is sectional drawing which shows the exhaust-gas purification apparatus by the 2nd reference example of this invention.

Explanation of symbols

1 Hydraulic excavator 2 Lower traveling body (vehicle body)
4 Upper swing body (car body)
8 Engine 9 Exhaust pipe (exhaust gas passage)
16 Purification device support bracket 16C, 16D Mounting plate 21, 41, 51, 61, 81, 91, 101, 111 Exhaust gas purification device 22, 52, 112 Upstream cylinder 23, 29, 33, 53, 56, 63, 67 , 70 Cylindrical case 23A, 29A, 33A, 53A, 56A Cylindrical part 23B, 29B, 53B Lid part 23C, 29C, 53C, 23C ', 29C' Flange part 23C1, 29C1, 33B1, 33C1 Connection surface 23D, 29D, 33D Bolt insertion hole 23E, 56D Temperature sensor mounting port 23F, 29E Pressure extraction part 24, 54, Inlet pipe (exhaust gas passage)
24A Blocking plate 24B Silencer cylinder 25, 57, 65, 85 Oxidation catalyst (processing member)
26, 31, 102, 116 Support legs (support members)
28, 62, 82 Downstream cylinder 30, 64, 88 Outflow pipe (exhaust gas passage)
32 Filter cylinder (Purification part cylinder)
33B, 56B, 33B 'Front flange part 33C, 56C, 33C' Rear flange part 33E, 53D, 56E Notch 34 Particulate matter removal filter (processing member)
35 bolt (fastening member)
36 Nut (fastening member)
37 Pressure sensor 38 Temperature sensor 42 Handle part 55, 84, 113 Oxidation catalyst cylinder (purification part cylinder)
58 U bolt (support member)
59 Nut (support member)
66, 83, 114 Injection valve cylinder (purification cylinder)
68,86 Urea injection valve (processing member)
69, 84, 115 Reduction catalyst cylinder (purification part cylinder)
71,87 Selective reduction catalyst (processing member)
92 V-shaped clamp

Claims (8)

An upstream cylinder having an exhaust gas inflow pipe provided upstream of an exhaust gas passage of an engine mounted on the vehicle body, and a downstream having an exhaust gas outflow pipe provided downstream of the exhaust gas passage A cylindrical body, and one or a plurality of purification unit cylindrical bodies provided in series between the upstream cylindrical body and the downstream cylindrical body and having a processing member for purifying exhaust gas therein. Prepared,
The purification unit cylinder includes a filter cylinder that contains a particulate matter removal filter that traps particulate matter inside, an oxidation catalyst cylinder that contains an oxidation catalyst inside, and a selective reduction catalyst that reduces NOx inside. In the exhaust gas purifying apparatus, which is one or a combination of the accommodated reduction catalyst cylinder and the injection valve cylinder containing the urea water injection valve for injecting urea water,
The upstream cylinder body, the downstream cylinder body, and the purification section cylinder body are provided with a flange portion having a flat connection surface at the end portion of the cylinder body connected to face each other,
In order to connect the purification unit cylinder in series between the upstream cylinder and the downstream cylinder, the flange portions of the two cylinders facing each other are fastened by a fastening member so as to be disassembled from each other,
Provided pressure outlet portion for taking out the pressure of the exhaust gas flowing through the exhaust gas passage and the upstream cylinder and the downstream cylinder, the temperature sensor installation opening for measuring the temperature, provided in the upstream cylinder,
And the upstream cylinder and the downstream cylinder are each provided with a support member for fixing them to a support bracket provided on the engine side,
A configuration in which the purification unit cylinder is connected between the upstream cylinder and the downstream cylinder and attached by the fastening member in a state where the upstream cylinder and the downstream cylinder are fixed to the support bracket. by, without removing the said upstream cylinder and the downstream cylinder from the support bracket, the exhaust gas purifying device, characterized in that made it possible to decompose and remove only the purifying part cylinder.   The flange part of the said cylinder for filters, the cylinder for reduction catalysts, and the cylinder for injection valves is a structure which provides a notch part which prevents rolling when the said fastening member is removed. Exhaust gas purification device.   3. The exhaust according to claim 1, wherein the filter cylinder, the reduction catalyst cylinder, and the injection valve cylinder are provided with a grip portion that is used when the cylinder is lifted by removing the fastening member. Gas purification device.   The exhaust gas purification device according to claim 1, 2 or 3, wherein an oxidation catalyst and / or a silencer cylinder is provided inside the upstream cylinder and the downstream cylinder.   The exhaust gas purification apparatus according to claim 1, 2, 3, or 4, wherein the support member is a support leg provided on the cylinder and fixed to the engine side.   The exhaust gas purification device according to claim 1, 2, 3, or 4, wherein the support member is configured by a U bolt that surrounds the cylindrical body and a nut that fastens the U bolt to the engine side.   The exhaust gas purifying device according to claim 1, 2, 3, 4, 5 or 6, wherein the fastening member is a bolt and a nut for fastening the flange portions facing each other.   The exhaust gas purifying device according to claim 1, 2, 3, 4, 5 or 6, wherein the fastening member is a substantially V-shaped clamp that surrounds and fastens the flange portions facing each other.

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