JP2014122592A - Purifier of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a purifier of a construction machine which allows easy attachment and detachment of a fastening member.SOLUTION: An upstream cylinder flange 24c of an upstream cylinder 23 and a filter cylinder flange 31B of a filter cylinder 30 are joined to each other by being fastened by an upstream-side fastening member 33. A downstream cylinder flange 28c of a downstream cylinder 27 and a filter cylinder flange 31C of the filter cylinder 30 are joined to each other by being fastened by a downstream-side fastening member 34. The upstream-side fastening member 33 and the downstream-side fastening member 34 are each constituted of: a plurality of frame members 35, 36 which are formed into circular shape contours and arranged being separated from each other in the circumferential direction; a connecting member 37 connecting both the frame members 35, 36 with a circumferential interval therebetween; and a fastening member 38 for fastening a starting end 39A of the plurality of connected frame members 39 which are connected by the connecting member 37 and a terminal end 39B of the connected frame members 39 so as to be detachable.

Description

  The present invention relates to a purification device for a construction machine that is mounted on a construction machine such as a hydraulic excavator or a hydraulic crane and is preferably used to remove harmful substances from engine exhaust gas.

  In general, a construction machine such as a hydraulic excavator or a hydraulic crane is capable of a self-propelled lower traveling body, an upper revolving body that is swingably mounted on the lower traveling body, and can be moved up and down on the front side of the upper revolving body. And a working device provided. The upper swing body has 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 serving as a prime mover for construction machinery. The exhaust gas discharged from such a diesel engine may contain harmful substances such as particulate matter (PM) and nitrogen oxide (NOx). For this reason, the construction machine is provided with a purification device that purifies the exhaust gas in an exhaust pipe that forms an exhaust gas passage of the engine.

  The purification device is an oxidation catalyst (for example, Diesel Oxidation Catalyst, also called DOC for short) that oxidizes and removes nitrogen monoxide (NO), carbon monoxide (CO), hydrocarbon (HC), etc. contained in exhaust gas. And a particulate matter removal filter that is disposed downstream of the oxidation catalyst and collects and removes particulate matter in the exhaust gas (for example, Diesel Particulate Filter, also called DPF for short) (See Patent Document 1 and Patent Document 2).

  This type of conventional purification apparatus includes an upstream cylinder provided on the upstream side in the flow direction of exhaust gas discharged from the engine, a downstream cylinder provided on the downstream side of the upstream cylinder, and these A purification unit cylinder is provided to be connected between the upstream cylinder and the downstream cylinder. Processing members such as a particulate matter removal filter, an oxidation catalyst, and a selective reduction catalyst for purifying exhaust gas are built in the purification unit cylinder. The upstream cylinder, the purification section cylinder, and the downstream cylinder are attached to a structure such as an engine provided in the upper swing body in a state where they are connected in series with each other using means such as flange connection and spigot fitting. It has a configuration.

JP 2003-120277 A JP 2010-19188 A

  By the way, a processing member, for example, a particulate matter removal filter, needs to perform maintenance work such as cleaning periodically. This maintenance work is performed by removing the purification unit cylinder from between the upstream cylinder and the downstream cylinder. Here, in the case of a configuration in which the fastening between the upstream cylinder and the purification section cylinder and the fastening between the purification section cylinder and the downstream side cylinder are performed by, for example, bolts and nuts, when removing the purification section cylinder It is necessary to remove many bolts and nuts. For this reason, there exists a possibility that the removal operation | work of the purification | cleaning part cylinder may become troublesome.

  The prior art according to Patent Document 1 is configured to perform fastening between the upstream cylinder and the purification unit cylinder and fastening between the purification unit cylinder and the downstream cylinder with a fastening member called a V-shaped clamp. It has become. This fastening member is connected to one end side of two semicircular arc-shaped frame members having a substantially V-shaped cross section so as to be rotatable by a hinge, and the other end side is detachably fastened by a bolt / nut. It is the composition to do. The fastening member is attached to and detached from the upstream cylindrical body, the downstream cylindrical body, etc. by swinging two semicircular arc-shaped frame members around the hinge on one end side to widen the interval on the other end side of each frame member ( Open).

  In this configuration, when the fastening member is attached and detached, the movable range of the two frame members is limited to swinging around the hinge, and the degree of freedom of deformation of the entire fastening member is small. For this reason, when placing the fastening member around the upstream cylinder, the downstream cylinder, etc., or when removing it from the surroundings, work to avoid the fastening member from obstacles (interferences) such as harnesses and protrusions around the purification device May be troublesome. In particular, a small hydraulic excavator called a mini excavator has a very small space around the engine and the purification device. For this reason, the attaching / detaching operation performed by the fastening member having a limited movable range is further complicated.

  The prior art according to Patent Document 2 has a configuration in which both ends of the purification section cylinder are fitted in-slots with the end of the upstream cylinder and the end of the downstream cylinder. In the case of this configuration, when the purification section cylinder is removed upward from between the upstream cylinder and the downstream cylinder, the upstream cylinder and the downstream cylinder are axially moved from the purification section cylinder prior to the removal. Therefore, it is necessary to release the spigot fitting. For this reason, there exists a possibility that the removal operation | work of the purification | cleaning part cylinder may become troublesome.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a construction machine purifying apparatus capable of easily attaching and detaching a fastening member.

  A purification device for a construction machine according to the present invention is provided in an exhaust cylinder of an engine mounted on a vehicle body and has an upstream cylinder having an upstream cylinder flange at a downstream end, and is provided downstream of the upstream cylinder. A downstream cylinder having a downstream cylinder flange at the upstream end, and a processing member for purifying exhaust gas provided between the upstream cylinder and the downstream cylinder is provided. And one or a plurality of purification unit cylinders each having a purification unit cylinder flange at the downstream end, and an upstream side fastened in a state where the upstream cylinder flange and the purification unit cylinder flange face each other It is comprised by the fastening member and the downstream fastening member fastened in the state which mutually faced between the said downstream cylinder flange and the purification | cleaning part cylinder flange.

  In order to solve the above-described problem, a feature of the configuration of the invention of claim 1 is that at least one of the upstream side fastening member and the downstream side fastening member has two flanges facing each other. To connect, the outer shape is an arc shape that fits the flange, and is attached to a plurality of frame members spaced apart in the circumferential direction and to the ends of two frame members adjacent in the circumferential direction so as to be swingable. One or a plurality of connecting members that connect the two with a circumferential interval, and a fastening member that detachably fastens the start and end of the plurality of connected frame members connected by the connecting members It is in the configuration.

  According to a second aspect of the present invention, the connecting member is configured by a connecting body that is swingably attached to end portions of two frame members adjacent to each other at one end side and the other end side.

  According to a third aspect of the present invention, the fastening member includes a pillar member attached to an end of one of the two adjacent frame members having a through hole, and the two adjacent frame members on one end side. The other frame member is pivotably attached to the end of the other frame member and the other end becomes a male threaded portion, and is inserted into the through hole of the column member, and is screwed into the male threaded portion of the coupled body. It consists of a nut.

  The invention according to claim 4 includes a plurality of the purification unit cylinders and one or a plurality of purification unit fastening members that are fastened in a state where the purification unit cylinder flanges face each other. The part fastening member is constituted by the plurality of frame members, the one or more connection members, and the fastening member.

  According to the first aspect of the present invention, the fastening member has a circumferential interval between a plurality of frame members arranged in an arc shape and spaced apart in the circumferential direction, and two frame members adjacent in the circumferential direction. And a fastening member that detachably fastens the start end and the end of the connection frame member. In this case, when the fastening member is attached to and detached from the flange, the end of one of the two adjacent frame members swings with respect to the one end of the connecting member. Thus, the end portion of the other frame member connected to the one frame member with a gap by the connection member also swings with respect to the other end portion of the connection member.

  That is, the fastening member has at least two positions between the start end and the end of the plurality of connection frame members connected by the connection member, specifically, one end of the connection member and the end of the one frame member. It can be swung (deformed) around the connection part at the connection part with the part and the connection part between the other end of the connection member and the end of the other frame member. For this reason, the movable range of a frame member and a connection member can be enlarged, and the freedom degree of a deformation | transformation of the whole fastening member can be improved. This avoids the fastening member from obstacles (interferences) such as harnesses and protrusions around the purification device when the fastening member is arranged around the upstream cylinder, the downstream cylinder, etc. or removed from the surroundings. Can be easily performed.

  In addition, the start ends and the end points of the plurality of connection frame members connected by the connection members are configured to be detachably fastened by the fastening members. For this reason, the fastening member can be easily attached and detached by fastening or releasing the starting end and the terminal end of the connecting frame member having a large movable range by the fastening member. Therefore, it is possible to facilitate the attaching / detaching operation of the fastening member, and in other words, it is possible to facilitate the attaching / detaching of the purification unit cylinder to the upstream cylinder and the downstream cylinder.

  According to invention of Claim 2, the connection body which comprises a connection member is each attached to the edge part of two adjacent frame members so that rocking | fluctuation is possible. For this reason, by appropriately setting the number of frame members and connecting bodies, the shape, dimensions, etc. of the connecting bodies, the movable range of the frame members, that is, the deformable range of the entire fastening member can be adjusted as desired. it can.

  According to the invention of claim 3, the fastening member includes a connecting body swingably attached to the end of the other frame member in the through hole of the column member attached to the end of the one frame member. By inserting and screwing a nut into the coupling body, the start end and the end of the connection frame member can be detachably fastened. For this reason, it is possible to easily fasten and release the connecting frame member from the start end and the terminal end by inserting / removing the connecting body with respect to the through hole of the column member and attaching / detaching the nut to / from the connecting body.

  According to the invention of claim 4, when the purification unit fastening member is arranged around the purification unit cylinder or removed from the surroundings, the harness around the purification device is provided with a plurality of purification unit cylinders. In addition, it is possible to easily perform the operation of avoiding the purification member fastening member from obstacles (interferences) such as protrusions. Therefore, in addition to the upstream side fastening member and the downstream side fastening member, it is possible to facilitate the attachment / detachment work of the purification unit fastening member.

It is a front view which shows the small hydraulic excavator to which the purification apparatus by embodiment of this invention is applied. It is a top view which shows a turning frame, an engine, a purification apparatus, etc. It is a front view which shows a turning frame, an engine, a purification apparatus, etc. It is a front view which shows an engine, a purification apparatus mounting base, and a purification apparatus. It is the side view which looked at the engine, the purification apparatus mounting base, and the purification apparatus from the left side of FIG. It is a perspective view which shows a purification apparatus mounting base and a purification apparatus. It is a longitudinal cross-sectional view which shows a purification apparatus. It is an expanded sectional view of the (VIII) section in Drawing 7 showing an upstream cylinder flange, a purification part cylinder flange, and a frame of a fastening member. It is a perspective view of the same position as FIG. 6 which shows the state which removes the purification | cleaning part cylinder from between an upstream cylinder and a downstream cylinder. It is a disassembled perspective view which shows the purification apparatus mounting base. It is a perspective view which shows a fastening member alone. It is a perspective view which shows the fastening member of the state which cancelled | released fastening of the fastening member. It is a perspective view which shows the fastening member by the 1st modification of this invention alone. It is a longitudinal cross-sectional view which shows the purification apparatus by the 2nd modification of this invention.

  Hereinafter, the embodiment of the purification apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 12 by taking as an example the case of applying to a small hydraulic excavator.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine used for earth and sand excavation work or the like. The hydraulic excavator 1 is a self-propelled crawler type lower traveling body 2 having left and right crawlers (crawler belts) 2A, and is mounted on the lower traveling body 2 so as to be able to turn. The upper revolving structure 3 and the swing type working device 4 provided on the front side of the upper revolving structure 3 are generally configured. The hydraulic excavator 1 shown in FIG. 1 has a vehicle body weight of about 3 to 7 tons and is usually called a mini excavator.

  The upper swing body 3 has a width dimension in the left and right directions that is substantially equal to the vehicle width of the lower traveling body 2 (the distance between the left and right crawlers 2A), and is formed in a substantially circular shape when viewed from above. As a result, the excavator 1 is a small rear turning type in which the rear surface of the counterweight 6 (described later) is substantially within the vehicle width of the lower traveling body 2 when the upper revolving body 3 performs the turning operation on the lower traveling body 2. It is configured as a hydraulic excavator. Here, the upper swing body 3 includes a swing frame 5, a counterweight 6, an engine 7, an exterior cover 20, and the like which will be described later.

  Reference numeral 5 denotes a revolving frame serving as a base of the upper revolving structure 3, and the revolving frame 5 forms a strong support structure. Specifically, as shown in FIG. 2, the swivel frame 5 is provided with a thick flat plate-like bottom plate 5A extending in the front and rear directions at the center in the left and right directions, and standing on the upper surface side of the bottom plate 5A. The left vertical plate 5B and the right vertical plate 5C extending in the front and rear directions, the support bracket 5D provided at the front end portions of the left and right vertical plates 5B and 5C, and the abbreviation provided on the left side of the bottom plate 5A. An arc-shaped left frame member 5E and a substantially arc-shaped right frame member 5F provided on the right side of the bottom plate 5A are roughly configured. The working device 4 is attached to the support bracket 5D located on the front end side of the revolving frame 5, and a counterweight 6 described later is attached to the rear end side of the bottom plate 5A constituting the revolving frame 5.

  Reference numeral 6 denotes a counterweight provided on the rear end side of the revolving frame 5, and the counterweight 6 is made of a heavy object integrally formed by using, for example, a casting means, and balances the weight with the work device 4. . The counterweight 6 extends in a substantially arc shape in the left and right directions at a position surrounding an engine 7 described later from the rear side.

  Reference numeral 7 denotes an engine mounted on the revolving frame 5 and positioned on the front side of the counterweight 6, and the engine 7 is arranged in a lateral state extending in the left and right directions. Since the engine 7 is mounted as a prime mover on the small hydraulic excavator 1, for example, a small diesel engine is used. On the left side of the engine 7, a pair of brackets 7 </ b> A for fixing a purification device mounting table 11 described later to the engine 7 is attached.

  A hydraulic pump 8 is disposed on the left side of the engine 7, and the hydraulic pump 8 is driven by the engine 7 to supply operating hydraulic oil to various hydraulic actuators mounted on the hydraulic excavator 1. It is. On the other hand, a heat exchanger 9 such as a radiator or an oil cooler is disposed on the right side of the engine 7, and the heat exchanger 9 is cooled by the cooling air sucked by the cooling fan 7B of the engine 7 (see FIG. 5). Cooling fluid such as cooling water and hydraulic oil.

  Reference numeral 10 denotes an exhaust pipe connected to the engine 7, and the exhaust pipe 10 forms a part of an exhaust gas passage for exhausting exhaust gas discharged from the engine 7 to the outside. Here, a purification device 22 to be described later is connected to the exhaust pipe 10. Exhaust gas discharged from the engine 7 is subjected to purification processing, silencing processing, and the like by the purification device 22 and then discharged to the outside of the excavator 1.

  Reference numeral 11 denotes a purification device mounting table attached to the left side of the engine 7, and the purification device mounting table 11 supports a purification device 22 described later with respect to the engine 7. As shown in FIGS. 4 to 6, 9, and 10, the purification device mounting table 11 is movable on the base 12 and a plate-like base 12 attached to the engine 7 via a pair of brackets 7 </ b> A. And a plate-like moving body 13 attached to the. Here, the base 12 is fixedly attached to the engine 7 in the lateral direction (horizontal direction), and the moving body 13 is configured to move on the base 12 in the lateral direction (horizontal direction).

  In the base body 12, an upstream cylinder support member 12 </ b> A that supports an upstream cylinder body 23 of the purification device 22, which will be described later, and a downstream cylinder support member 12 </ b> B that supports a downstream cylinder body 27 are arranged along the axis XX of the purification device 22. They are spaced apart in the direction. Further, the base 12 is provided with a pair of upstream cylinder side through holes 12C (see FIG. 10) located on both sides of the upstream cylinder support member 12A (both sides in the direction orthogonal to the axis XX). An upstream cylinder side U-bolt 14 for fixing the upstream cylinder 23 to the upstream cylinder support member 12A is inserted through the through hole 12C. The upstream cylinder 23 is fixed to the upstream cylinder support member 12A by screwing a pair of nuts 14A to the tip of the U-bolt 14, and the upstream cylinder support member 12A is loosened by loosening the pair of nuts 14A. It can move in the direction of the axis XX above.

  Further, the base body 12 is provided with a pair of downstream cylinder side through holes 12D (see FIG. 10) located on both sides of the downstream cylinder support member 12B (both sides in the direction orthogonal to the axis XX). The downstream cylinder side U-bolt 15 for fixing the downstream cylinder 27 to the downstream cylinder support member 12B is inserted through the through hole 12D. The downstream cylinder 27 is fixed to the downstream cylinder support member 12B by screwing a pair of nuts 15A to the tips of the U bolts 15, and the downstream cylinder support member 12B is loosened by loosening the pair of nuts 15A. It can move in the direction of the axis XX above.

  On the other hand, the movable body 13 is provided with a filter cylinder support member 13 </ b> A as a purification section cylinder support member that supports the filter cylinder 30 of the purification device 22. The filter cylinder support member 13A is provided with a positioning hole 13A1 (see FIG. 4) for positioning the filter cylinder 30, and a positioning projection 31D of the filter cylinder 30 described later is engaged with the positioning hole 13A1. . The moving body 13 is positioned between the upstream cylinder support member 12A and the downstream cylinder support member 12B and is mounted on the base 12 so as to be movable in a direction orthogonal to the axis XX of the purifier 22. Yes. In this case, the movable body 13 is configured to be guided on the base body 12 in a direction orthogonal to the axis XX by a slide-type guide mechanism by concave-convex fitting.

  For this purpose, the upper surface of the base 12 is provided with a recess 12E extending in a direction orthogonal to the axis XX and having the same width as the width of the moving body 13 at a position corresponding to the moving body 13. The body 13 is concavo-convexly fitted to the recess 12E so as to be movable. Here, the moving body 13 is provided with a bolt insertion hole 13B at a position away from the filter cylinder support member 13A, and a female screw hole 12E1 is provided at a position corresponding to the bolt insertion hole 13B at the recessed portion 12E of the base body 12. It has been. The moving body 13 is fixed to the base 12 by a fixing bolt 13C inserted through the bolt insertion hole 13B and screwed into the female screw hole 12E1 (prevents movement in a direction perpendicular to the axis XX). By removing it, the fixation is released (movement is allowed).

  Reference numeral 16 denotes a driver's seat on which an operator of the hydraulic excavator 1 is seated. Work levers 17 for operating the work device 4 and the like are disposed on the left and right sides of the driver's seat 16. Further, a traveling lever / pedal 18 is provided in front of the driver's seat 16. A canopy 19 is provided above the driver's seat 16 to protect the operator seated on the driver's seat 16 from rainwater and the like.

  Reference numeral 20 denotes an exterior cover provided on the revolving frame 5, and the exterior cover 20 constitutes a building of the upper revolving structure 3 together with the counterweight 6. Here, the exterior cover 20 is a left side cover 20A as a side cover extending forward from the left end side of the counterweight 6 and a left side cover provided so as to cover the periphery of the revolving frame 5 from the tip of the left side cover 20A. A skirt cover 20B, a right side cover (not shown) extending forward from the right end side of the counterweight 6, and a right skirt cover (see FIG. 5) provided so as to cover the periphery of the revolving frame 5 from the tip of the right side cover. (Not shown) and an openable / closable tank cover (not shown) located on the right side and covering the hydraulic oil tank or the like.

  A device storage chamber 21 surrounded by a counterweight 6, an exterior cover 20, and the like is defined inside the upper swing body 3, and in this device storage chamber 21, an engine 7, a hydraulic pump 8, and a heat exchanger 9 are formed. Internal devices such as a purification device 22 described later are accommodated. In this case, the left side cover 20 </ b> A has a configuration that can be opened and closed when maintaining the internal devices including the engine 7. For this purpose, the left side cover 20A is detachably attached to the turning frame 5 and the like.

  Next, the purification device 22 that purifies and silences exhaust gas discharged from the engine 7 will be described.

  A purification device 22 is provided connected to the exhaust pipe 10, and the purification device 22 purifies the exhaust gas discharged from the engine 7. Here, the purifying device 22 is placed on the purifying device mounting base 11 attached to the engine 7 and is disposed above the hydraulic pump 8 with the axis line XX aligned with the front and rear directions of the vehicle body. Yes. The purification device 22 constitutes an exhaust gas passage together with the exhaust pipe 10, and removes harmful substances contained in the exhaust gas while the exhaust gas flows from the upstream side to the downstream side.

  That is, the engine 7 made of a diesel engine has high efficiency and excellent durability. However, the exhaust gas of the engine 7 contains harmful substances such as particulate matter (PM), nitrogen oxides (NOx), and carbon monoxide (CO). For this reason, as shown in FIG. 7, the purifier 22 oxidizes and removes carbon monoxide (CO) or the like in the exhaust gas, which will be described later, and particulate matter (PM) in the exhaust gas. It includes a particulate matter removal filter 32 to be collected and removed, which will be described later.

  More specifically, the purifying device 22 includes three upstream cylinders 23, a downstream cylinder 27, and a filter cylinder 30, which will be described later, by an upstream fastening member 33 and a downstream fastening member 34. It is configured to connect in series. Further, as shown in FIG. 7, the upstream cylinder 23 accommodates the oxidation catalyst 26, and the downstream cylinder 27 accommodates the upstream side of the outflow pipe 29 having a silencing function, and the upstream cylinder 23 and the downstream cylinder are accommodated. A particulate matter removing filter 32 is accommodated in the filter cylinder 30 that is detachably provided to the body 27.

  Reference numeral 23 denotes an upstream cylinder provided at the front side position of the purification device 22 on the upstream side of the exhaust gas passage of the engine 7, and the upstream cylinder 23 constitutes an inlet portion into which exhaust gas flows. Here, as shown in FIG. 7, the upstream cylindrical body 23 is roughly constituted by a cylindrical case 24 described later and an oxidation catalyst 26.

  Reference numeral 24 denotes a cylindrical case constituting an outer shell of the upstream cylindrical body 23. The cylindrical case 24 includes a cylindrical portion 24A having a large diameter cylindrical shape, and one end side of the cylindrical portion 24A (left end side in FIG. 7). And an upstream cylindrical flange 24C provided in a bowl shape over the entire circumference at the downstream end serving as the other end side opening (opening on the right end side in FIG. 7) of the cylindrical portion 24A. It is configured. The connection surface 24C1 of the upstream cylindrical flange 24C is formed as an annular flat surface orthogonal to the axis XX. An inflow pipe 25 having a silencing function is attached to the upstream cylinder 23 so as to extend in the lateral direction, and an oxidation catalyst 26 is accommodated inside the upstream cylinder 23. The upstream side of the inflow pipe 25 is connected to the downstream side of the exhaust pipe 10.

  An oxidation catalyst 26 is located in the downstream side of the inflow pipe 25 and is accommodated in the cylindrical case 24. The oxidation catalyst 26 constitutes one of the processing members for purifying the exhaust gas. The oxidation catalyst 26 oxidizes and removes nitrogen monoxide (NO), carbon monoxide (CO), hydrocarbons (HC), etc. contained in the exhaust gas by circulating the exhaust gas under a predetermined temperature condition. To do.

  Reference numeral 27 denotes a downstream cylinder provided on the downstream side of the upstream cylinder 23 and located on the rear side of the purification device 22. The downstream cylinder 27 is disposed on the opposite side of the upstream cylinder 23 with a filter cylinder 30 described later interposed therebetween, and constitutes an outlet portion through which exhaust gas flows out. As shown in FIG. 7, the downstream cylindrical body 27 is roughly constituted by a cylindrical case 28 described later and an outflow pipe 29.

  28 is a cylindrical case constituting the outer shell of the downstream cylindrical body 27, and the cylindrical case 28 is substantially the same as the cylindrical case 24 of the upstream cylindrical body 23, and a cylindrical portion 28A having a large-diameter cylindrical shape, A closed portion 28B that closes one end side (right end side in FIG. 7) of the cylindrical portion 28A and an upstream end portion that becomes the other end side opening (opening on the left end side in FIG. 7) of the cylindrical portion 28A are provided over the entire circumference. And a downstream cylindrical flange 28C provided in a bowl shape. The connection surface 28C1 of the downstream cylindrical flange 28C is formed as an annular flat surface orthogonal to the axis XX.

  Reference numeral 29 denotes an outflow pipe called a tail pipe provided on the rear side (downstream side) of the cylindrical case 28. The outflow pipe 29 has a silencing function and is attached so as to penetrate the cylindrical portion 28A of the cylindrical case 28 in the radial direction. The upper end side of the outflow pipe 29 protruding from the cylindrical case 28 protrudes above the exterior cover 20 shown in FIG. 1 and is released to the atmosphere.

  Reference numeral 30 denotes one filter cylinder provided in series between the upstream cylinder 23 and the downstream cylinder 27. The filter cylinder 30 constitutes a purification part cylinder having a processing member for purifying exhaust gas. Here, as shown in FIG. 7, the filter cylinder 30 is roughly constituted by a cylindrical case 31 described later and a particulate matter removal filter 32.

  Reference numeral 31 denotes a cylindrical case constituting the outer shell of the filter cylinder 30, and the cylindrical case 31 accommodates the particulate matter removing filter 32 therein. Here, the cylindrical case 31 includes a cylindrical portion 31A having substantially the same outer diameter as the cylindrical case 24 of the upstream cylindrical body 23 and the cylindrical case 28 of the downstream cylindrical body 27, and an opening on one end side of the cylindrical portion 31A ( Filter cylinders provided in a bowl shape over the entire circumference at the upstream end serving as the left end opening in FIG. 7 and the downstream end serving as the other end opening (the right end opening in FIG. 7). It is roughly constituted by flanges 31B and 31C.

  The connection surfaces 31B1, 31C1 of the filter cylinder flanges 31B, 31C are formed as annular flat surfaces orthogonal to the axis XX. On the other hand, a positioning projection 31D (see FIG. 4) that protrudes from the outer peripheral surface is provided on the outer peripheral surface of the cylindrical portion 31A. The positioning projection 31D engages the positioning hole 13A1 of the filter cylinder support member 13A, thereby positioning the filter cylinder 30 with respect to the filter cylinder support member 13A.

  Reference numeral 32 denotes a particulate matter removal filter housed in the cylindrical case 31, and the particulate matter removal filter 32 constitutes one of the processing members. The particulate matter removing filter 32 collects particulate matter in the exhaust gas discharged from the engine 7 and purifies the exhaust gas by burning and removing the collected particulate matter. .

  Next, the upstream side fastening member 33 that fastens the upstream cylinder 23 and the filter cylinder 30 and the downstream side fastening member 34 that fastens the downstream cylinder 27 and the filter cylinder 30 will be described.

  That is, 33 indicates an upstream side fastening member that fastens the upstream cylinder flange 24C and the filter cylinder flange 31B in a state of facing each other. On the other hand, reference numeral 34 denotes a downstream side fastening member that fastens the downstream cylinder flange 28C and the filter cylinder flange 31C while facing each other. Each of the upstream side fastening member 33 and the downstream side fastening member 34 includes a plurality of (two) frame members 35, 36, one connection member 37, and one fastening member 38. The upstream side fastening member 33 and the downstream side fastening member 34 have the same configuration and operational effects except that the flanges 24C, 28C, 31B, 31C to be fastened are different. For this reason, the following description is mainly given about the upstream side fastening member 33, and about the downstream side fastening member 34, the same code | symbol is attached | subjected to the same component and the description is abbreviate | omitted.

  Reference numerals 35 and 36 denote two frame members that are spaced apart from each other in the circumferential direction of the upstream cylinder flange 24C and the filter cylinder flange 31B. These frame members 35 and 36 are connected so that two flanges (the upstream cylinder flange 24C and the filter cylinder flange 31B) facing each other have an outer shape that is part of the circumferential direction of the two flanges 24C and 31B. It has an arc shape that fits partially. As shown in FIG. 8, each frame member 35, 36 connects a pair of side portions 35 </ b> A, 36 </ b> A that are inclined toward each other toward the radially outer side of the flanges 24 </ b> C, 31 </ b> B, and these side portions 35 </ b> A, 36 </ b> A. It is formed by the top portions 35B and 36B, and its cross section has a mountain shape (substantially V-shaped, substantially Mt. Fuji). When a fastening member 38, which will be described later, is fastened, the distance between the ends of the frame members 35, 36 on the fastening member 38 side (starting end 39A and terminal end 39B of a connecting frame member 39, which will be described later) is reduced. The members 35 and 36 are pressed toward the radially inner side of the upstream cylinder flange 24C and the filter cylinder flange 31B. Thereby, the frame members 35 and 36 can clamp the upstream cylinder flange 24C and the filter cylinder flange 31B in the axial direction.

  Here, one of the two frame members 35, 36 is provided with two connection member mounting holes 35 </ b> C at an end portion on the connection member 37 side which will be described later, and on the fastening member 38 side which will be described later. Two fastening member mounting holes 35D are provided at the end. Each connection member attachment hole 35C is inserted with an end portion of a connection body 37A constituting the connection member 37, and a column member 38A constituting the fastening member 38 is inserted into the fastening member attachment hole 35D.

  On the other hand, the other frame member 36 of the two frame members 35, 36 is provided with two connection member mounting holes 36 </ b> C at an end portion on the connection member 37 side described later, and an end on the fastening member 38 side described later. Two fastening member mounting holes 36D are provided in the portion. Each connection member mounting hole 36C is inserted with an end portion of a connection body 37A constituting the connection member 37, and each coupling member 38B constituting the fastening member 38 is inserted into the fastening member attachment hole 36D. .

  Reference numeral 37 denotes a connection member provided between the frame members 35 and 36. The connection member 37 connects the two frame members 35 and 36 with an interval in the circumferential direction. The connecting member 37 is swingably attached to the end portions of the two frame members 35 and 36 adjacent in the circumferential direction. That is, the connection member 37 has two U-shaped connection bodies 37 </ b> A that are swingably attached to the end portions of two frame members 35, 36 that are adjacent to each other at one end side and the other end side. And a retaining pin 37B that is attached to the end of each connecting body 37A and prevents the end of each connecting body 37A from being pulled out from the connecting member mounting holes 35C, 36C of the frame members 35, 36. ing. The end portions of the connection body 37A are inserted into the connection member mounting holes 35C and 36C, and the retaining pins 37B are attached to the end portions so that the end portions of the connection members 37A are swingably attached to the end portions of the frame members 35 and 36, respectively. Yes.

  38 is a fastening member provided on the opposite side of the connection member 37 across the frame members 35, 36. The fastening member 38 is a plurality of (two) connection frames connected by the connection member 37. The start end 39A and the end end 39B of the member 39 are detachably fastened. That is, as shown in FIG. 12, the connection frame member 39 constituted by the connection member 37 and the two frame members 35 and 36 connected by the connection member 37 is connected to the connection member 37 and the frame member 35. The part and the connection part between the connection member 37 and the frame member 36 can swing around the connection part. Such a connected frame member 39 is configured such that the start end 39A and the end end 39B thereof are detachably fastened by a fastening member 38.

  The fastening member 38 has a pair of through holes 38A1 and is attached to the end of the frame member 35. The fastening member 38 is swingably attached to the end of the frame member 36 at one end, and the male threaded portion 38B1 at the other end. The two L-shaped coupling bodies 38B inserted into the through holes 38A1 of the column member 38A and the one end side of each coupling body 38B are attached to the ends of the coupling bodies 38B. It is constituted by a retaining pin 38C that prevents it from being pulled out from the attachment member mounting hole 36D, and a pair of nuts 38D that are screwed into the male screw portion 38B1 of each connecting body 38B.

  The column member 38 </ b> A is inserted across the pair of fastening member attachment holes 35 </ b> D of the frame member 35. One end side of each coupling body 38B is inserted into the fastening member attachment hole 36D, and is attached to the end portion of the frame member 36 in a swingable manner by attaching a retaining pin 38C to the end portion. The other end side of the coupling body 38B is inserted into the through hole 38A1 of the column member 38A when the start end 39A and the end end 39B of the connection frame member 39 are fastened, and the nut 38D is screwed into the male screw portion 38B1. . In accordance with the screwing (tightening) of the nut 38D, the distance between the end portions (starting end 39A and terminating end 39B) on the fastening member 38 side of each frame member 35, 36 is reduced. The upstream cylinder flange 24C and the filter cylinder flange 31B can be tightened in the axial direction.

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

  The operator of the excavator 1 sits in the driver seat 16 of the upper swing body 3 and starts the engine 7 to drive the hydraulic pump 8. Thereby, the pressure oil from the hydraulic pump 8 is supplied to various actuators via the control valve. When the operator operates the traveling lever / pedal 18, the lower traveling body 2 can be moved forward or backward.

  On the other hand, when the operator operates the working lever 17, the working device 4 can be moved up and down to perform excavation work of earth and sand. In this case, since the small excavator 1 has a small turning radius due to the upper swing body 3, for example, even in a narrow work site such as an urban area, it is possible to perform a side ditching operation while driving the upper swing body 3 to rotate. .

  Further, when the engine 7 is in operation, particulate matter or the like that is a harmful substance is discharged from the exhaust pipe 10. At this time, the purification device 22 can oxidize and remove hydrocarbons (HC), nitrogen oxides (NO), and carbon monoxide (CO) in the exhaust gas by, for example, the oxidation catalyst 26. And the particulate matter removal filter 32 can collect the particulate matter contained in the exhaust gas, and can burn and remove the collected particulate matter. Thus, the purified exhaust gas can be discharged to the outside through the outflow pipe 29 on the downstream side.

  When maintaining the particulate matter removal filter 32, the filter cylinder 30 is removed from between the upstream cylinder 23 and the downstream cylinder 27. Then, after performing necessary maintenance such as cleaning of the particulate matter removal filter 32, the filter cylinder 30 is attached between the upstream cylinder 23 and the downstream cylinder 27. Therefore, a procedure for removing and attaching the filter cylinder 30 with respect to the upstream cylinder 23 and the downstream cylinder 27 will be described.

  First, when removing the filter cylinder 30 from the state shown in FIG. 6, the upstream fastening member 33 and the downstream fastening member 34 are removed from the periphery of the filter cylinder 30. To remove the upstream side fastening member 33, the nut 38D of the fastening member 38 of the upstream side fastening member 33 is loosened, and the nut 38D is removed from the male screw portion 38B1 of the coupling body 38B. Next, the other end side of the coupling body 38B is extracted from the through hole 38A1 of the column member 38A, and the fastening between the start end 39A and the end end 39B of the connection frame member 39 is released. Then, each frame member 35, 36 is removed radially outward from the upstream cylinder flange 24C and the filter cylinder flange 31B, and the connected frame member 39 is pulled out along the periphery of both the flanges 24C, 31B. The same applies to the downstream side fastening member 34.

  In this case, the connection frame member 39 is located at two positions between the start end 39A and the end end 39B, specifically, the connection site between the connection member 37 and one frame member 35, and the connection member 37 and the other end. It can be swung (deformed) around the connection site at the connection site with the frame member 36. For this reason, when removing the fastening members 33 and 34 from the surroundings of the cylinders 23, 27 and 30, work to avoid the fastening members 33 and 34 from obstacles (interferences) such as harnesses and protrusions around the purification device 22. Can be easily performed.

  Next, the nut 14A of the upstream cylinder side U bolt 14 and the nut 15A of the downstream cylinder side U bolt 15 are loosened. Thereby, the upstream cylinder 23 and the downstream cylinder 27 can move in the direction of the axis XX, and the upstream cylinder 23 and the downstream cylinder 27 are retracted from the filter cylinder 30 in the direction of the axis XX. Can be made. In this state, the fixing bolt 13C of the purification device mounting table 11 is removed, and the movable body 13 is moved along the recessed portion 12E of the base 12 in the direction orthogonal to the axis XX direction, as shown in FIG. Thereby, the filter cylinder 30 can be removed from between the upstream cylinder 23 and the downstream cylinder 27.

  On the other hand, when attaching the filter cylinder 30 between the upstream cylinder 23 and the downstream cylinder 27, the moving body 13 is moved along the recessed portion 12E of the base body 12 in a direction orthogonal to the axis XX direction, The filter cylinder 30 is inserted between the upstream cylinder 23 and the downstream cylinder 27. Then, the bolt insertion hole 13B of the moving body 13 and the female screw hole 12E1 of the base 12 are aligned, and the fixing bolt 13C is inserted into the bolt insertion hole 13B and screwed into the female screw hole 12E1. Next, the upstream side fastening member 33 and the downstream side fastening member 34 are attached around the filter cylinder 30.

  The upstream fastening member 33 is attached by mounting the connection frame member 39 along the circumferential direction of the upstream cylinder flange 24C and the filter cylinder flange 31B. Next, the other end side of the coupling body 38B is inserted into the through hole 38A1 of the column member 38A, and a nut 38D is screwed into the male screw portion 38B1 of the coupling body 38B. As the nut 38D is tightened, the distance between the end portions of the frame members 35 and 36 on the fastening member 38 side is reduced, and the upstream cylindrical flange 24C and the filter cylinder flange 31B are pivoted by the frame members 35 and 36. Tightened in the direction.

  Accordingly, the start end 39A and the end end 39B of the connection frame member 39 are fastened, and the upstream cylinder 23 and the filter cylinder 30 are connected. The same applies to the downstream side fastening member 34. When the connection between the upstream cylinder 23 and the filter cylinder 30 and the connection between the downstream cylinder 27 and the filter cylinder 30 are performed using the upstream fastening member 33 and the downstream fastening member 34, The nut 14A of the upstream cylinder side U bolt 14 and the nut 15A of the downstream cylinder side U bolt 15 are tightened. Even when the upstream side fastening member 33 and the downstream side fastening member 34 are attached, the connection frame member 39 swings at two positions between the start end 39A and the end end 39B. For this reason, attachment of the fastening members 33 and 34 can be easily performed while avoiding the fastening members 33 and 34 from obstacles (interferences) such as harnesses and protrusions around the purification device 22.

  Thus, according to the present embodiment, the fastening members 33 and 34 are configured such that the outer shape is an arc shape and the plurality of frame members 35 and 36 are arranged apart from each other in the circumferential direction, and two frame members adjacent in the circumferential direction. The connecting member 37 connects the members 35 and 36 with a circumferential interval, and the fastening member 38 fastens the start end 39A and the end end 39B of the connection frame member 39 in a detachable manner. In this case, when the fastening members 33 and 34 are attached to and detached from the flanges 24C, 28C, 31B and 31C, the end portion of one of the two adjacent frame members 35 and 36 is connected to the connecting member. In addition to swinging with respect to one end of 37, the end of the other frame member 36 connected to the one frame member 35 at an interval by the connection member 37 is also connected to the connection member 37. Oscillates with respect to the other end.

  That is, the fastening members 33 and 34 are at least at two positions between the start end 39 </ b> A and the end end 39 </ b> B of the plurality of connection frame members 39 connected by the connection member 37, specifically, one end of the connection member 37. Oscillates around the connection part at the connection part between the other part of the connection member 37 and the end part of the other frame member 36. ). For this reason, the movable range of the frame members 35 and 36 and the connection member 37 can be enlarged, and the freedom degree of a deformation | transformation of the fastening members 33 and 34 whole can be improved. Thus, when the fastening members 33, 34 are arranged around the upstream cylinder 23, the downstream cylinder 27, or the like, or when they are removed from the surroundings, obstacles (interferences) such as harnesses and protrusions around the purifier 22 Therefore, the work of avoiding the fastening members 33 and 34 can be easily performed.

  In addition, the start end 39A and the end end 39B of the plurality of connection frame members 39 connected by the connection member 37 are configured to be detachably fastened by a fastening member 38. For this reason, the fastening members 33 and 34 can be easily attached and detached by fastening or releasing the starting end 39A and the terminal end 39B of the connecting frame member 39 having a large movable range by the fastening member 38. . Therefore, it is possible to facilitate the attachment / detachment work of the fastening members 33, 34, and to facilitate the attachment / detachment of the filter cylinder 30 with respect to the upstream cylinder 23 and the downstream cylinder 27.

  According to the present embodiment, the connection body 37A constituting the connection member 37 is swingably attached to the end portions of the two adjacent frame members 35 and 36, respectively. For this reason, by appropriately setting the number of the frame members 35 and 36 and the connection body 37A, the shape and dimensions of the connection body 37A, the movable range of the frame members 35 and 36, and the fastening members 33 and 34 as a whole. The deformable range can be adjusted as desired.

  According to this embodiment, the fastening member 38 is swingably attached to the end of the other frame member 36 in the through hole 38A1 of the column member 38A attached to the end of the one frame member 35. By inserting the connected body 38B and screwing the nut 38D into the connected body 38B, the start end 39A and the end end 39B of the connection frame member 39 can be detachably fastened. For this reason, it is easy to fasten and release the start end 39A and the end end 39B of the connection frame member 39 by inserting / removing the connecting body 38B with respect to the through hole 38A1 of the column member 38A and attaching / detaching the nut 38D to / from the connecting body 38B. Can be done.

  In the embodiment described above, the upstream side fastening member 33 and the downstream side fastening member 34 are constituted by two frame members 35 and 36, one connection member 37, and one fastening member 38. The case of the configuration has been described as an example. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 13, the fastening member 41 includes three frame members 42, 43, 44 and two connection members 37. And one fastening member 38 may be used. That is, the fastening member can be composed of a plurality of frame members, a plurality of connection members, and a single (a plurality of fastening members as required).

  Moreover, in embodiment mentioned above, the case where the purification apparatus 22 was comprised from three cylinders, the upstream cylinder 23, the downstream cylinder 27, and the filter cylinder 30, was demonstrated as an example. However, the present invention is not limited to this. For example, as in the second modification shown in FIG. 14, the purification device 51 includes the upstream cylinder 52, the downstream cylinder 27, the filter cylinder 30, You may comprise by four cylinders with the catalyst cylinder 53 as the purification | cleaning part cylinder which incorporated the oxidation catalyst 26 as a process member for purifying exhaust gas.

  In this case, at the upstream end and the downstream end of the catalyst cylinder 53, a catalyst cylinder flange 53A is provided in a bowl shape over the entire circumference, and the catalyst cylinder flange 53A of the catalyst cylinder 53 and the filter cylinder are provided. The filter cylinder flange 31 </ b> B of the body 30 is fastened by a purification unit fastening member 54 having the same configuration as the upstream fastening member 33 and the downstream fastening member 34. That is, a plurality of purification unit cylinders that are connected between the upstream cylinder body and the downstream cylinder body and have a processing member for purifying exhaust gas can be provided.

  In the above-described embodiment, the case where the particulate matter removing filter 32 and the oxidation catalyst 26 are used as the processing member of the purification device 22 has been described as an example. However, the present invention is not limited to this. For example, another type of catalyst or filter such as a selective reduction catalyst may be used as a processing member for purifying exhaust gas. .

  Furthermore, in the above-described embodiment, the case where the purification device 22 is mounted on the small hydraulic excavator 1 has been described as an example. However, the construction machine purification apparatus according to the present invention is not limited to this, and may be applied to, for example, a middle-sized or larger hydraulic excavator purification apparatus. Further, the present invention can be widely applied to purification apparatuses for various construction machines such as a hydraulic excavator, a wheel loader, a forklift, a hydraulic crane, etc., each having a wheel type lower traveling body.

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
7 Engine 22, 51 Purification device 23, 52 Upstream cylinder 24C Upstream cylinder flange 26 Oxidation catalyst (processing member)
27 Downstream cylinder 28C Downstream cylinder flange 30 Filter cylinder (purification section cylinder)
31B Filter cylinder flange (Purification part cylinder flange)
32 Particulate matter removal filter (processing member)
33 Upstream side fastening member 34 Downstream side fastening member 35, 36, 42, 43, 44 Frame member 37 Connection member 37A Connection body 38 Fastening member 38A Column member 38A1 Through hole 38B Connection body 38B1 Male thread portion 38D Nut 39 Connection frame member 39A Start end 39B End 41 Fastening member 53 Catalyst cylinder (purification part cylinder)
53A Catalyst cylinder flange (Purification part cylinder flange)
54 Purification part fastening member

Claims (4)

An upstream cylinder provided in an exhaust gas passage of an engine mounted on a vehicle body and having an upstream cylinder flange at a downstream end, and a downstream cylinder flange provided downstream from the upstream cylinder and at an upstream end A downstream cylindrical body, and a processing member for purifying exhaust gas provided between the upstream cylindrical body and the downstream cylindrical body, and a purification section cylinder at the upstream end and the downstream end, respectively. One or a plurality of purification part cylinders having a body flange, an upstream side fastening member that fastens the upstream cylinder flange and the purification part cylinder flange in a state of facing each other, and the downstream cylinder flange, In the purification device for a construction machine configured by a downstream fastening member that is fastened in a state of facing each other between the purification unit cylindrical flange,
At least one fastening member of the upstream fastening member and the downstream fastening member is
A plurality of frame members arranged in an arcuate shape in which the outer shape fits the flanges and spaced apart in the circumferential direction in order to connect two flanges facing each other;
One or a plurality of connecting members attached to the end portions of two frame members adjacent in the circumferential direction so as to be swingable, and connecting the two with a circumferential interval;
A purification apparatus for a construction machine, comprising: a fastening member that detachably fastens start and end ends of a plurality of connection frame members connected by the connection member.   The said connection member is the purification apparatus of the construction machine of Claim 1 comprised by the connection body attached to the edge part of two frame members which an end side and an other end side adjoin each other so that rocking | fluctuation is possible.   The fastening member has a through hole and is attached to an end portion of one of the two adjacent frame members, and the other frame member of the two adjacent frame members on one end side The connecting member is swingably attached to the end of the connecting member, and has a male threaded portion at the other end, and is inserted into the through hole of the pillar member, and a nut screwed into the male threaded portion of the connecting member. The purification apparatus for a construction machine according to claim 1 or 2. A plurality of the purification part cylinders, and one or a plurality of purification part fastening members fastened in a state where the purification part cylinder flanges face each other;
The purification device for a construction machine according to claim 1, 2 or 3, wherein the purification portion fastening member comprises the plurality of frame members, the one or more connection members, and the fastening member.

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