JP2015121102A - Tank with strainer and construction equipment having tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply urea water to an urea water tank of construction equipment from a marketing urea water solution container certainly and rapidly with a simple constitution.SOLUTION: A strainer 40 with an advance/retreat mechanism is provided in construction equipment equipping with an emission control device for clarifying exhaust gas of a Diesel engine, and the strainer 40 is attached to an urea water tank 60 supplying urea water to the emission control device. The urea water tank is accommodated in a tool room 25 positioned in front of a fuel tank of the Diesel engine. During disuse, the strainer is retreated to the urea water tank and held in the tool room while when the urea water is supplied to the urea water tank, the tip can progress to the outside of the tool room.

Description

  The present invention relates to a tank provided in a construction machine or the like and a construction machine provided with the tank, and more particularly to a tank having a strainer suitable for use in a urea water tank used for exhaust gas treatment and a construction machine provided with the tank.

  In a construction machine equipped with a diesel engine, several methods for reducing exhaust gas in response to engine exhaust gas regulations have been proposed. For example, in Patent Document 1, an exhaust gas treatment device is provided in an exhaust system of a diesel engine, and exhaust gas of the diesel engine is guided to a NOx reduction catalyst provided on the downstream side of the exhaust pipe. As the exhaust gas treatment device, a urea selective reduction type NOx treatment device using an aqueous urea solution (liquid reducing agent) is used. The liquid reducing agent tank is connected to the exhaust pipe using a liquid reducing agent supply pipe, and the urea aqueous solution in the liquid reducing agent tank is supplied to the exhaust pipe by a pump.

  At that time, in order to improve the water supply, maintenance and heat retention of the liquid reducing agent tank, a tool box having an upper surface opening is installed in the upper swing body, and the liquid reducing agent is stored in this tool box. A tank for resinous liquid reducing agent is installed.

JP 2011-012661 A

  In the construction machine described in Patent Document 1, the construction machine can be used even in a low-temperature environment. Therefore, there is no problem even when using urea water that is easily frozen and has a large volume expansion during freezing. A synthetic resin tank is provided in the tool box to improve heat retention so that exhaust gas treatment can be performed. However, in the construction machine described in this publication, since the tank made of synthetic resin is arranged in the tool box with the lid of the construction machine, it is easy to access the urea water tank from the side of the construction machine. It is not sufficiently considered to supply urea aqueous solution directly from a commercially available container filled with urea water to the urea water tank.

  That is, the urea aqueous solution container used for the exhaust gas treatment is usually a container having a supply nozzle on the upper surface and having a capacity of about 20 liters. For this reason, in order to simplify the work and enable field work, a construction machine operator (operator) supplies urea water directly from the commercially available urea aqueous solution container to the urea water tank of the construction machine. As a result, when the urea aqueous solution is supplied, the operation of manually lifting the urea aqueous solution container while the lid of the tool chamber gets in the way is likely to cause a problem that part of the urea aqueous solution spills out of the tank. If a small amount is carefully supplied to the tank to prevent this spillage, the supply time to the tank will become longer. Another method for preventing spills outside the tank is to use a funnel to supply the tank, but the funnel must be provided in the tool room, etc. When moving or moving, there is a risk of loss. In addition, it is necessary to hold the funnel stably when working with the funnel, but it is necessary to make the tool room as small as possible from the viewpoint of the space efficiency of construction machinery. In the tool room where various equipment is stored, the funnel is stable. It is difficult to secure.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to enable urea water to be reliably and quickly supplied from a commercially available urea aqueous solution container to a urea water tank of a construction machine with a simple configuration. It is in. Another object of the present invention is to enable an operator to easily and easily supply a urea aqueous solution to a urea water tank.

  A feature of the present invention that achieves the above object is that it is provided in a construction machine equipped with an exhaust gas purification device that purifies exhaust gas of a diesel engine, and a urea water tank that supplies urea water to the exhaust gas purification device has a strainer. The strainer is housed in a tool chamber located in front of the fuel tank of the diesel engine, and the strainer is retracted to the tank and held in the tool chamber when not in use, and urea water is supplied to the tank. When supplying, it has an advancing / retreating mechanism that allows the tip portion to advance to the outside of the tool chamber.

  In this feature, the advance / retreat mechanism of the strainer includes a filler neck that holds the strainer in the tank, a forward / backward member that is movable relative to the filler neck and can hold a filter on the tank side, and A guide groove that engages with the filler neck, and a guide groove that allows the advance / retreat member to move relative to the filler neck is provided in the advance / retreat member, and a protrusion that engages with the guide groove is provided on the filler neck. The guide groove is preferably formed in an L shape at the end of the filter holding side.

  In the above feature, a fitting protrusion and a slit are formed at an end of the advance / retreat member opposite to the filter holding side, a through hole is formed in the outer periphery of the filler neck, and the fitting protrusion is formed in the through hole. It is preferable to prevent the advance / retreat member from entering the tank by fitting.

  Another feature of the present invention that achieves the above object is that in a construction machine equipped with a diesel engine and an exhaust gas purifying device that purifies exhaust gas of the diesel engine, urea water is supplied to the exhaust gas purifying device on the side frame. And a strainer attached to the tank and having an advance / retreat mechanism. The tank is accommodated in a tool chamber located in front of a fuel tank of the diesel engine, and the strainer is not used. Sometimes it is retracted to the tank and held in the tool chamber, and when supplying urea water to the tank, the tip can be extended to the outside of the tool chamber. Provide a step for boarding the upper surface of the construction machine, and when the urea water is supplied to the tank, the bag filled with urea water There is an in-box that was made possible placed on the step.

  According to the present invention, a urea water supply port of a urea water tank mounted on a tool box of a construction machine can be attached with a strainer that can be moved forward and backward to the urea water tank, and a urea aqueous solution container is installed in the construction machine when urea water is supplied. Since it can be placed at the boarding step, urea water can be supplied from a commercially available urea aqueous solution container to a urea water tank of a construction machine reliably and quickly with a simple configuration. Further, the urea aqueous solution can be easily and easily supplied to the urea water tank by the operator.

It is a right view of one Example of the construction machine which concerns on this invention. It is a top view of the construction machine shown in FIG. It is a perspective view around the tool chamber with which the construction machine shown in FIG. 1 is equipped. It is a cross-sectional view of one embodiment of a urea water tank accommodated in the tool chamber shown in FIG. FIG. 5 is a detailed view of each part of a strainer attached to the urea water tank shown in FIG. 4. It is a figure explaining a mode that urea solution is supplied to a urea solution tank using a strainer.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator 20 as a construction machine according to the present invention. The hydraulic excavator 20 is mounted on the lower traveling body 1 around which the crawler belt 10 is wound, the upper part of the lower traveling body, the cab 3 mounted by the operator on the front side, and the counterweight 8 on the rear side. The upper swing body 2 and the front 4 attached to the front end of the upper swing body 2 are provided.

  One end of the front 4 is attached to the upper swing body 2, and a boom 4a that can be raised and lowered, an arm 4b that is attached to the other end of the boom 4a and can be raised and lowered, and attached to the distal end of the arm 4b. And an attachment 4c. In the present embodiment, a bucket is shown as the attachment 4c, but the attachment 4c is not limited to a bucket.

  In order to drive the boom 4a, the arm 4b, and the bucket 4c, a boom cylinder 5a, an arm cylinder 5b, and a bucket cylinder 5c are provided, and both ends of the boom cylinder 5a are connected to the upper swing body 2 and the boom 4a. Both ends of 5b are attached to boom 4a and arm 5b, and both ends of bucket cylinder 5c are attached to arm 5b and bucket 5c, respectively.

  A cab 3 is disposed on the left front side of the upper swing body 2, and a tool box 25 is disposed on the right front side with the front 4 interposed therebetween. A cover 34 and a building cover 36 are disposed behind the tool box 25, and the tool box 25, the cover 34, and the building cover 36 are provided on the revolving frame 26. When the excavator 20 is maintained, an operator can enter the upper surface of the tool box 25, the cover 34, and the building cover 36. Further, inside the tool box 25, a tank 60 of urea water, which will be described in detail later, is housed.

  FIG. 2 is a top view of the upper swing body 2 portion of the excavator 20. As described above, the tool box 25 is disposed at the right front portion of the revolving frame 26, and the engine room 17 is disposed at the rear portion of the revolving frame 26. A diesel engine 18 is disposed in the engine room 17 and serves as a drive source for driving a hydraulic pump (not shown) and this excavator 20.

  A cooling fan 15 is attached to the shaft end of the engine 18 for sending air to a cooler 14 composed of an oil cooler, a radiator or the like. On the other hand, an exhaust gas treatment device 16 for injecting urea water into the exhaust gas to reduce nitrogen oxides NOx is disposed at the tip of the exhaust pipe 19 of the engine 18 to purify the exhaust of the diesel engine 18. Yes.

  Here, when a diesel engine is used, the exhaust gas of the engine contains a large amount of nitrogen oxides NOx. In recent years, exhaust gas regulations for diesel engine vehicles have been strengthened, and NOx reduction has been demanded. As one of NOx reduction methods, SCR (selective catalytic reduction) has been introduced. This method is a method of injecting harmless and safe urea water into the engine exhaust instead of ammonia that is not easy to handle and reducing NOx by a chemical reaction of the catalyst. The urea water injected into the exhaust gas is defined by JIS K2247-1 or ISO 2241-1.

  As described above, when urea water is used as an exhaust gas countermeasure for the diesel engine 18, the exhaust gas is purified. However, as described in Patent Document 1, the urea water may freeze at a low temperature (−11 ° C. or lower), and the engine It is necessary to keep it close to. Therefore, it is normally stored in a urea water tank 60 provided in the front tool box 25 opposite to the cab 3 across the end of the front 4.

  Since the amount of urea water required for purification is about 3% of the fuel, the capacity of the urea water tank 60 is set to about 20 to 80 L depending on the capacity of the fuel tank. In order to mount a large amount of urea water on the excavator 20 in this way, for example, a back-in-box (BIB) described in Mitsui's catalog (http://mitsui-adblue.jp/product/lineup_backin.html) From the 20 L container, the urea water tank 60 is supplied using an attached nozzle.

  Details of the supply of urea water from the BIB to the urea water tank 60 will be described below with reference to FIGS. FIG. 3 is a perspective view around the tool box 25. The tool box 25 is disposed adjacent to the center frame 2c in which the boom mounting hole 2b and the boom cylinder mounting hole 2a are formed.

  A fuel tank and an oil tank are disposed on the revolving frame 26 on the right side surface of the excavator 20, and the upper surface of these tanks is covered with a building cover 36. The upper surface of the swivel frame 26 in front of the building cover 36 is formed in a staircase shape, and a urea water tank 60 can be stored inside the staircase. In FIG. 3, there are two steps.

  The upper stairs include a cover 34 and an open / close door 35 provided over a part of the front surface and the upper surface of the cover 34 so that the upper surface side of the cover 34 can be opened. The lower stairs include a cover 32 having a shape obtained by cutting off a part of the front surface portion 32a and the upper surface portion 32b, and a bent opening / closing door 33 for opening and closing the cut portion. A handle portion 33b is formed on the front surface portion of the opening / closing door 33 in the vicinity of the end portion for opening and closing. A hinge 33a is attached to the rear end portion of the opening / closing door 33 so that the opening / closing door 33 can be opened and closed. At the front end of the swivel frame 26 is attached a step 31 in which a number of mud dropping holes 31a are formed. The step 31 and the covers 32 and 34 are provided as stairs when an operator enters the building cover 36 of the excavator.

  FIG. 4 shows a cross-sectional view of the tool box 25 in the front-rear direction. The open / close door 33 is in a closed state. A urea water tank 60 is accommodated in the tool box 25. The urea water tank 60 has a pentagonal cross section obtained by cutting off the upper part of the front side of a rectangular parallelepiped box with rounded corners, and a strainer 40, which will be described in detail later, is attached to the slope of the cut-off portion. A cap 58 is attached to the tip of the head. The urea water tank 60 has a pentagonal cross section so that even if the urea water 65 accommodated in the urea water tank 60 is frozen and its volume increases, the urea water tank 60 is not damaged. This is for forming a gap in the upper part.

  That is, by supplying urea water from the slope portion of the urea water tank 60, the liquid level 66 of the urea water 65 stays at a position where there is a gap between the urea water tank 60 and the ceiling surface inside. Therefore, even if the urea water 65 expands inside the urea water tank 60, the gap is only narrowed. For the purpose of preventing freezing, the urea water tank 60 is preferably made of a synthetic resin. In order to prevent excessive stress from being applied to the urea water tank 60 even if freezing occurs, the urea water tank 60 is made of stainless steel. It is good to make it.

  On the upper surface of the urea water tank 60, a fixture 61 for attaching a pipe 64 for guiding the urea water 65 to the exhaust gas treatment device 16 is provided. Further, a suction pipe 63 connected to the fixture 61 and extending into the urea water tank 60 is provided. A pump 62 is provided in the middle of the pipe 64 that leads to the exhaust gas treatment device 16, and the urea water 65 in the urea water tank 60 can be sucked and led to the exhaust gas treatment device 16.

  In order to save space, a step-like cover 32 that accommodates the urea water tank 60 and an open / close door 33 that covers the opening of the cover 32 are provided close to the urea water tank 60. Therefore, even if it is going to supply urea water 65 to the urea water tank 60 from the nozzle of the above-mentioned commercially available BIB, the front door part 32a of the opening / closing door 33 and the cover 32 gets in the way, and the supply formed on the slope part of the urea water tank 60 When the urea water 65 is supplied from the strainer 40 attached to the hole, the urea water 65 may be spilled and the hydraulic excavator 20 may be soiled. In that case, parts such as iron, copper, gun metal, and aluminum may be corroded, and thus must be wiped off.

  Therefore, the strainer 40 according to the present invention can be moved back and forth with respect to the urea water tank 60, and when supplying the urea water 65, the tip end portion comes out from the tool box 25 portion to connect the urea water BIB nozzle. While facilitating, leakage from the connecting portion is prevented. Besides, when supplying the urea water, most of the strainer 40 is retracted into the urea water tank 60 and the tip portion is held in a state where the tip portion does not protrude from the cut-off portion of the urea water tank 60. Thereby, the cover 32 and the urea water tank 60 can be brought close to each other, and space saving can be realized.

  Details of the strainer 40 according to the present invention are shown in FIG. FIG. 5A is a perspective view of the strainer 40 and shows a state when the urea water 65 is supplied to the urea water tank 60. FIG. 5B is a perspective view of the strainer 40 and shows a state when the strainer 40 is not used. In these drawings, the cap 58 attached to the tip of the strainer 40 is omitted. FIG. 5C is a perspective view of the filler neck 50 constituting the distal end portion of the strainer 40, and FIG. 5D is a vertical cross-sectional shape of the distal end portion of the cylindrical portion 41 constituting the strainer 40, FIG. ) Is a vertical cross-sectional shape of the filler neck 50.

  The strainer 40 is mainly composed of a cylindrical advance / retreat member 45, a filler neck 50 engaged with the advance / retreat member 45, and a cap 58 (not shown in FIG. 5). One end side of the cylindrical advance / retreat member 45 accommodates the filter 43 and constitutes a discharge portion 42 having a rough skeleton shape and an end portion of the skeleton formed in a dome shape. The discharge part 42 is connected to a cylindrical part 41 formed in a long cylindrical shape.

  Projections 46 are provided at a plurality of locations in the circumferential direction (two locations approximately symmetrical in FIG. 5A) at the tip of the cylindrical portion 41 in order to lock and hold the filler neck 50. As shown in the cross section of FIG. 5D, the protrusion 46 forms an upper inclined portion 46b and a lower inclined portion 46c that are inclined in the advancing / retreating direction at both ends of the advancing / retreating member 45 in the advancing / retreating direction. A projecting portion 46a is formed between the inclined portions 46b and 46c, and is fitted into a locking hole 54a provided in a filler neck 50 described later. In order to facilitate the fitting with the filler neck 50, slits 47 longer than the protrusion length are formed on both sides in the circumferential direction of the plurality of protrusions 46 and on the distal end side of the cylindrical portion 41. Since the slit 47 is formed in the tube portion 41, the operator can release the fitting between the advance / retreat member 45 and the filler neck 50 by pushing the projection 46 into the tube portion 41. Conversely, the advance / retreat member 45 can be fitted to the filler neck 50.

  The cylindrical portion 41 is formed with a guide groove 44 extending from the vicinity of the distal end portion of the cylindrical portion 41 in the axial direction (advancing and retracting direction) of the cylindrical portion 41. The guide groove 44 includes an advance / retreat guide groove 44a that extends linearly in the axial direction, and a fixing groove 44b that is provided at an end of the advance / retreat guide groove 44a on the discharge portion 42 side and extends substantially perpendicular to the advance / retreat guide groove 44a. It is configured.

  The filler neck 50 includes a flange portion 51 provided at an intermediate portion in the axial direction, and a cap receiving portion 52 and a lock portion 53 located on both sides of the flange portion 51. In the flange portion 51, a plurality of screwing holes 55 for fixing to the urea water tank 60 are formed in the circumferential direction. The cap receiving part 52 has a cylindrical shape and is formed on the upper side (on the anti-urea water tank 60 side) of the flange part 51. A screw or a locking mechanism with which the cap 58 is engaged is formed on the outer peripheral part. The lock portion 53 is also cylindrical and has locking holes 54a formed at a plurality of locations in the circumferential direction. The circumferential position of the locking hole 54 a corresponds to the position of the protrusion 46 formed on the advance / retreat member 45.

  A guide protrusion 54 b is provided on the inner peripheral end of the cylindrical lock portion 53. The circumferential width and height of the guide protrusion 54 b correspond to the width and depth of the guide groove 44 formed in the advance / retreat member 45. Therefore, the advance / retreat member 45 is movable in the axial direction while being engaged with the guide protrusion 54 b in the guide groove 44. Further, when the advance / retreat member 45 is moved to the end of the guide groove 44 on the discharge part 42 side, the advance / retreat member 45 is rotated in the circumferential direction along the fixing groove 44b while being locked to the guide projection 54b. Further movement of the member 45 can be restricted and fixed (locked).

  That is, as shown in FIG. 5A, when the advance / retreat member 45 is positioned on the anti-urea water tank 60 side, the advance / retreat member 45 is moved in the axial direction along the guide groove 44 and finally rotated in the circumferential direction. Let it lock. When the strainer 40 is not used, as shown in FIG. 5B, the advance / retreat member 45 is rotated along the fixing groove 44b of the guide groove 44 to release the lock, and then the advance / retreat member 45 is moved in the axial direction. Move. When the advance / retreat member 45 moves to the front end, the protrusion 46 formed at the front end of the advance / retreat member 45 is engaged with the engagement hole 54a of the filler neck 50, thereby preventing the advance / retreat member 45 from entering the urea water tank 60.

  FIG. 6 shows how the urea water 65 is supplied from the back-in-box (BIB) 70 to the urea water tank 60 using the strainer 40 described above. The BIB 70 is provided with a dedicated nozzle 71 in order to avoid contamination with impurities. By placing the BIB 70 on the step 31 of the excavator 20, the load on the operator is reduced. When the urea water capacity in the BIB 70 decreases, the BIB 70 is lifted and supplied to the urea water tank 60. Moreover, since the cylinder part 41 of the advance / retreat member 45 extends to the outside of the cover 32 of the tool chamber 25, the operation efficiency is improved without the urea water supply operation being obstructed by the open / close door 33 or the like. Even if the urea water 65 is spilled, the outer surface side of the excavator 20 is wiped off, and the operation is easy. The capacity of the BIB 70 is 20 L (about the same as a commercially available plastic tank).

  As described above, by using the strainer of the present embodiment, it is possible to prevent urea water from spilling outside when supplying urea water from the BIB to the urea water tank accommodated in the tool chamber. Further, since the advancing / retreating member is retracted to the urea water tank side when not in use, the volume of the tool chamber accommodating the urea water tank can be reduced, or the volume accommodating other components can be increased.

DESCRIPTION OF SYMBOLS 1 ... Lower traveling body, 2 ... Upper turning body, 2a ... Boom cylinder mounting hole, 2b ... Boom mounting hole, 2c ... Center frame, 3 ... Cab, 4 ... Front, 4a ... Boom, 4b ... Arm, 4c ... Attachment ( Bucket), 5a ... boom cylinder, 5b ... arm cylinder, 5c ... bucket cylinder, 8 ... counterweight, 10 ... footwear, 11 ... driving wheel, 12 ... driven wheel, 14 ... cooler, 15 ... cooling fan, 16 ... exhaust gas Processing unit, 17 ... engine room, 18 ... (diesel) engine, 19 ... exhaust pipe, 20 ... construction machine (hydraulic excavator), 25 ... tool box, 26 ... swivel frame, 31 ... step, 31a ... mud drop hole, 32 ... Cover, 32a ... Front part, 32b ... Upper surface part, 33 ... Opening / closing door, 33a ... Hinge, 33b ... Handle part, 33c ... Front part, 33d ... Upper surface part, 4 ... Cover, 35 ... Open / close door, 36 ... Building cover, 40 ... Strainer, 41 ... Tube part, 42 ... Discharge part, 43 ... Filter, 44 ... Guide groove, 44a ... Advance / retreat guide groove, 44b ... Fixing groove, 45 Advancing / retreating member, 46 ... protrusion, 46a ... projecting portion, 46b ... (upper) inclined portion, 46c ... (lower) inclined portion, 47 ... slit, 50 ... filler neck, 51 ... flange portion, 52 ... cap receiving portion, 53 ... Lock part, 54a ... Locking hole, 54b ... Guide projection, 55 ... Screw fixing hole, 58 ... Cap, 60 ... (urea water) tank, 61 ... Fixture, 62 ... Pump, 63 ... Suction pipe, 64: piping, 65: urea water, 66: liquid level, 70: back-in-box, 71: nozzle.

Claims (4)

A urea water tank for supplying urea water to the exhaust gas purification device, provided in a construction machine equipped with an exhaust gas purification device for purifying exhaust gas of a diesel engine,
The tank has a strainer and is housed in a tool chamber located in front of a fuel tank of the diesel engine, and the strainer is retracted to the tank and held in the tool chamber when not in use. A tank having a strainer, characterized by having an advancing / retreating mechanism that allows the tip portion to advance to the outside of the tool chamber when supplying urea water to the tank.   The strainer advance / retreat mechanism is engaged with the filler neck, a filler neck that holds the strainer in the tank, an advancing / retracting member that is movable relative to the filler neck and can hold the filter on the tank side, and the filler neck. A guide groove is provided on the advancing / retracting member, and a protrusion engaging with the guide groove is provided on the inner surface side of the filler neck. The tank having a strainer according to claim 1, wherein the guide groove is formed in an L shape at an end portion on the filter holding side.   A fitting projection and a slit are formed at the end of the advance / retreat member opposite to the filter holding side, a through hole is formed in the outer periphery of the filler neck, and the fitting projection is fitted into the through hole to The tank having a strainer according to claim 1 or 2, wherein an advancing / retreating member is prevented from entering the tank. In a construction machine equipped with a diesel engine and an exhaust gas purification device for purifying exhaust gas of the diesel engine,
A tank disposed on a side frame for supplying urea water to the exhaust gas purification device; and a strainer attached to the tank and having an advance / retreat mechanism. The strainer is accommodated in the tool chamber located, and when not in use, the strainer is retracted to the tank and held in the tool chamber. A step for boarding the upper surface of the construction machine on the side frame on the front side of the tool room, and a back-in box filled with urea water when supplying urea water to the tank. A construction machine comprising a tank having a strainer that can be placed on the step.

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