JP2011012661A - Construction machine - Google Patents

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JP2011012661A
JP2011012661A JP2009160247A JP2009160247A JP2011012661A JP 2011012661 A JP2011012661 A JP 2011012661A JP 2009160247 A JP2009160247 A JP 2009160247A JP 2009160247 A JP2009160247 A JP 2009160247A JP 2011012661 A JP2011012661 A JP 2011012661A
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reducing agent
liquid reducing
agent tank
tool box
tank
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Tetsuya Sugaya
徹也 菅谷
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Sumitomo SHI Construction Machinery Co Ltd
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Sumitomo SHI Construction Machinery Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To improve the water-supply suitability, maintainability and heat-retaining property of a liquid reducing agent tank.SOLUTION: In a construction machine in which a toolbox 15 having a top opening is arranged in an upper turning body 2 and the liquid reducing agent tank 11 storing a liquid reducing agent is mounted, the liquid reducing agent tank 11 is formed of synthetic resin and the liquid reducing agent tank 11 is disposed in the toolbox 15.

Description

本発明は建設機械に関するものであり、特に、液体還元剤を貯留した液体還元剤用タンクが搭載された建設機械に関するものである。   The present invention relates to a construction machine, and more particularly, to a construction machine equipped with a liquid reducing agent tank storing a liquid reducing agent.

近年、ディーゼルエンジンを搭載した油圧ショベル等の建設機械では、高次の排ガス規制に対応すべく、ディーゼルエンジンの排気系に排ガス処理装置が設置され、ディーゼルエンジンからの排ガスは、排気管の下流側に設けたＮＯｘ還元触媒を通って大気中に放出される。   In recent years, construction equipment such as hydraulic excavators equipped with diesel engines has been equipped with exhaust gas treatment equipment in the exhaust system of diesel engines to meet higher-level exhaust gas regulations. Is released into the atmosphere through the NOx reduction catalyst provided in

従来、此種排ガス処理装置としては、尿素水溶液（液体還元剤）を用いた尿素選択還元型のＮＯｘ処理装置が多く採択され、尿素水溶液は金属製の液体還元剤用タンクに貯留されている。又、液体還元剤用タンクは液体還元剤供給パイプにより排気管に接続され、液体還元剤供給ポンプにより液体還元剤用タンク内の尿素水溶液を前記排気管に供給できるように構成されている（例えば、特許文献１参照）。   Conventionally, as this kind of exhaust gas treatment apparatus, a urea selective reduction type NOx treatment apparatus using a urea aqueous solution (liquid reducing agent) is often adopted, and the urea aqueous solution is stored in a metallic liquid reducing agent tank. Further, the liquid reducing agent tank is connected to an exhaust pipe by a liquid reducing agent supply pipe, and is configured so that an aqueous urea solution in the liquid reducing agent tank can be supplied to the exhaust pipe by a liquid reducing agent supply pump (for example, , See Patent Document 1).

特開２００３−２０９３６号公報JP 2003-20936 A

上記液体還元剤用タンクは、上部旋回体の内側の狭隘な場所に設置されているので、液体還元剤用タンクに尿素水溶液を補給する際、或いは、液体還元剤用タンクのメンテナンス作業を行う際に、不自然は姿勢を余儀なくされるために、液体還元剤用タンクの給水性及びメンテナンス性が良くないという問題があった。   Since the liquid reducing agent tank is installed in a narrow place inside the upper revolving structure, when the urea solution is supplied to the liquid reducing agent tank or when the maintenance work of the liquid reducing agent tank is performed. In addition, since unnaturalness is forced to take a posture, there is a problem that the water supply and maintenance of the liquid reducing agent tank are not good.

又、金属製の液体還元剤用タンク内の尿素水溶液は、氷点下以下の低温になると凍結し易くなり、凍結した場合には尿素水溶液を液体還元剤として使用できなくなる。   In addition, the urea aqueous solution in the metal liquid reducing agent tank is easily frozen when the temperature is below the freezing point, and when it is frozen, the urea aqueous solution cannot be used as the liquid reducing agent.

前記液体還元剤用タンク内の尿素水溶液の凍結を防止するには、例えば、液体還元剤用タンクを電気ヒーターで加熱して保温性を高めればよいが、このように構成すると、構造が複雑で設備コストが高騰するとともに、電気エネルギの消費量が増大する。   In order to prevent the urea aqueous solution in the liquid reducing agent tank from freezing, for example, the liquid reducing agent tank may be heated with an electric heater to improve the heat retaining property. As the equipment cost rises, the consumption of electrical energy increases.

そこで、構成が簡単で液体還元剤用タンクの給水性、メンテナンス性及び保温性を向上させるために解決すべき技術的課題が生じてくるのであり、本発明はこの課題を解決することを目的とする。   Therefore, there is a technical problem to be solved in order to improve the water supply, maintainability and heat retention of the liquid reducing agent tank with a simple configuration, and the present invention aims to solve this problem. To do.

本発明は上記目的を達成するために提案されたものであり、請求項１記載の発明は、液体還元剤を貯留した液体還元剤用タンクが搭載された建設機械において、前記液体還元剤用タンクを合成樹脂により形成し、且つ、該液体還元剤用タンクを上部旋回体の外側部に配設された工具箱内に設置したことを特徴とする建設機械を提供する。   The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a construction machine equipped with a liquid reducing agent tank storing a liquid reducing agent, wherein the liquid reducing agent tank is mounted on the construction machine. And a liquid reducing agent tank is installed in a tool box disposed on the outer side of the upper rotating body.

この構成によれば、液体還元剤用タンクは、上部旋回体の外側部に配設された工具箱内に設置されている。依って、還元剤用タンクに液体還元剤を補給する際、或いは、液体還
元剤用タンクのメンテナンスを行う際は上部旋回体の外側よりスムーズに作業を行える。又、液体還元剤用タンクを合成樹脂により形成したので、金属製のものに比べて液体還元剤用タンクの保温性が向上する。 According to this configuration, the liquid reducing agent tank is installed in the tool box disposed on the outer side of the upper swing body. Therefore, when the liquid reducing agent is replenished to the reducing agent tank or when the liquid reducing agent tank is maintained, the work can be smoothly performed from the outside of the upper swing body. In addition, since the liquid reducing agent tank is made of synthetic resin, the heat retaining property of the liquid reducing agent tank is improved as compared with a metallic one.

請求項２記載の発明は、上記工具箱は上面開口部を有し、該上面開口部をカバー体により開閉可能に施蓋したことを特徴とする請求項１記載の建設機械を提供する。   According to a second aspect of the present invention, there is provided the construction machine according to the first aspect, wherein the tool box has an upper surface opening, and the upper surface opening is covered with a cover body so as to be opened and closed.

この構成によれば、液体還元剤用タンクが設置された工具箱は上面開口部を有するので、液体還元剤用タンクに液体還元剤を補給する際は、工具箱の上面開口部より補給される。又、工具箱の上面開口部はカバー体により施蓋されるので、液体還元剤用タンクの保温性が良好に保持される。   According to this configuration, since the tool box in which the liquid reducing agent tank is installed has the upper surface opening, when the liquid reducing agent is replenished to the liquid reducing agent tank, it is replenished from the upper surface opening of the tool box. . Further, since the upper surface opening of the tool box is covered with the cover body, the heat retaining property of the liquid reducing agent tank is well maintained.

請求項１記載の発明は、還元剤用タンクに液体還元剤を補給する際、或いは、液体還元剤用タンクのメンテナンスを行う際は、上部旋回体の外側より容易に作業を実行できるので、前記液体還元剤の補給性及びメンテナンス性を向上させることができる。   According to the first aspect of the present invention, when the reductant tank is replenished with the liquid reductant or when the liquid reductant tank is maintained, the work can be easily performed from the outside of the upper swing body. The replenishability and maintainability of the liquid reducing agent can be improved.

又、液体還元剤用タンクを合成樹脂により形成したことにより、構成がシンプルでありながら液体還元剤用タンクの保温性が向上して、液体還元剤の凍結防止効果に寄与することができる。   In addition, since the liquid reducing agent tank is made of synthetic resin, the heat retaining property of the liquid reducing agent tank is improved while the structure is simple, thereby contributing to the effect of preventing the liquid reducing agent from freezing.

請求項２記載の発明は、液体還元剤用タンクは、開閉可能なカバー体付き上面開口部を有する工具箱内に設置したので、請求項１記載の発明の効果に加えて、液体還元剤用タンクの保温性を維持しつつ液体還元剤用タンクへの液体還元剤の補給を一層容易迅速に行うことができる。   According to the second aspect of the present invention, since the liquid reducing agent tank is installed in a tool box having an openable upper surface opening with a cover body, in addition to the effect of the first aspect, the liquid reducing agent tank The liquid reducing agent can be replenished to the liquid reducing agent tank more easily and quickly while maintaining the heat retaining property of the tank.

本発明の一実施例を示し、油圧ショベル（建設機械）の側面図。The side view of the hydraulic excavator (construction machine) which shows one Example of this invention. 一実施例に係る油圧ショベルの上部旋回体を示す平面図。The top view which shows the upper turning body of the hydraulic shovel which concerns on one Example. 一実施例に係る液体還元剤用タンクの設置箇所を説明する斜視図。The perspective view explaining the installation location of the tank for liquid reducing agents which concerns on one Example.

本発明は、液体還元剤用タンクの給水性、メンテナンス性及び保温性を向上させるという目的を達成するために、上部旋回体に上面開口部を有する工具箱が配設され、且つ、液体還元剤を貯留した液体還元剤用タンクが搭載された建設機械において、前記液体還元剤用タンクを合成樹脂により形成すると共に、該液体還元剤用タンクを前記工具箱内に設置したことにより達成した。   In order to achieve the object of improving the water supply, maintenance performance and heat retention of a liquid reducing agent tank, the present invention is provided with a tool box having an upper surface opening in an upper swing body, and a liquid reducing agent. This was achieved by forming the liquid reductant tank from a synthetic resin and installing the liquid reductant tank in the tool box.

以下、本発明の好適な実施例を図１乃至図３に従って説明する。図１は建設機械の一例として油圧ショベルを示す。同図に示すように、下部走行体１上には上部旋回体２が旋回可能に装架され、上部旋回体２の前方一側部にキャブ３が設けられている。また、上部旋回体２の前方中央部にブーム４が俯仰可能に枢着され、該ブーム４の先端部にはアーム５が上下回動可能に連結されているとともに、該アーム５の先端部にバケット６が上下回動可能に取り付けられている。   A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a hydraulic excavator as an example of a construction machine. As shown in the figure, an upper swing body 2 is mounted on the lower traveling body 1 so as to be capable of swinging, and a cab 3 is provided on one front side of the upper swing body 2. In addition, the boom 4 is pivotally attached to the front center portion of the upper swing body 2 so that the boom 4 can be raised and lowered, and an arm 5 is connected to the distal end portion of the boom 4 so as to be rotatable up and down. A bucket 6 is attached so as to be rotatable up and down.

図２に示すように、上部旋回体２の後部にはエンジンルーム７が形成され、該エンジンルーム７内にはディーゼルエンジン８が設置されている。又、ディーゼルエンジン８の前方側（図２における手前側）には冷却ファン１２が設けられているとともに、該冷却ファン１２の前方には熱交換機１３が設置されている。   As shown in FIG. 2, an engine room 7 is formed at the rear of the upper swing body 2, and a diesel engine 8 is installed in the engine room 7. A cooling fan 12 is provided on the front side (front side in FIG. 2) of the diesel engine 8, and a heat exchanger 13 is installed on the front side of the cooling fan 12.

更に、ディーゼルエンジン８には排気管９が接続され、該排気管９の下流側には、高次の排ガス規制に対応すべく、排ガス処理装置１０が設置されている。本実施例に係る排ガス処理装置１０としては、尿素水溶液（液体還元剤）を用いた尿素選択還元型のＮＯｘ処理装置が採択されている。   Further, an exhaust pipe 9 is connected to the diesel engine 8, and an exhaust gas treatment device 10 is installed on the downstream side of the exhaust pipe 9 in order to comply with higher-order exhaust gas regulations. As the exhaust gas treatment apparatus 10 according to the present embodiment, a urea selective reduction type NOx treatment apparatus using a urea aqueous solution (liquid reducing agent) is adopted.

図３に示すように、前記上部旋回体２の旋回フレーム１４上には工具箱１５が配設されている。本実施例に係る工具箱１５は、上部旋回体２の前方他側部（図２の左上側部）に配設されている。又、工具箱１５は上面開口部１７を有し、該上面開口部１７はカバー体１８により開閉可能に施蓋されている。尚、符号１６はエンジンフードである。   As shown in FIG. 3, a tool box 15 is disposed on the swing frame 14 of the upper swing body 2. The tool box 15 according to the present embodiment is disposed on the other front side (upper left side in FIG. 2) of the upper swing body 2. The tool box 15 has an upper surface opening 17, and the upper surface opening 17 is covered with a cover body 18 so as to be opened and closed. Reference numeral 16 denotes an engine hood.

工具箱１５内には液体還元剤用タンク１１が設置され、該液体還元剤用タンク１１内には尿素水溶液が貯留されている。また、液体還元剤用タンク１１は所定厚さの合成樹脂、例えば、所要の断熱性を有するポリエチレン樹脂等により構成されている。   A liquid reducing agent tank 11 is installed in the tool box 15, and an aqueous urea solution is stored in the liquid reducing agent tank 11. The liquid reducing agent tank 11 is made of a synthetic resin having a predetermined thickness, for example, a polyethylene resin having a required heat insulating property.

更に、液体還元剤用タンク１１の上面略中央部には給水口（図示せず）が開穿されていると共に、該給水口にはキャップ２０が被着されている。又、液体還元剤用タンク１１は液体還元剤供給パイプ（図示せず）を介して、前記排ガス処理装置１０に接続されている。   Further, a water supply port (not shown) is opened in the substantially central portion of the upper surface of the liquid reducing agent tank 11, and a cap 20 is attached to the water supply port. The liquid reducing agent tank 11 is connected to the exhaust gas treatment device 10 via a liquid reducing agent supply pipe (not shown).

叙上の如く本発明によると、液体還元剤用タンク１１は、上部旋回体２の外側部に配設したカバー体１８付きの工具箱１５内に設置されている。依って、液体還元剤用タンク１１の給水口から尿素水溶液を補給する際は、工具箱１５のカバー体１８を開放させることにより、工具箱１５の上面開口部１７より直接補給できる。斯くして、作業者は、液体還元剤用タンク１１への尿素水溶液の補給を上部旋回体２の外側から容易迅速に行うことができる。   As described above, according to the present invention, the liquid reducing agent tank 11 is installed in the tool box 15 with the cover body 18 disposed on the outer side of the upper swing body 2. Therefore, when the urea aqueous solution is replenished from the water supply port of the liquid reducing agent tank 11, the cover body 18 of the tool box 15 can be opened to directly replenish from the upper surface opening 17 of the tool box 15. Thus, the operator can easily and quickly supply the aqueous urea solution to the liquid reducing agent tank 11 from the outside of the upper swing body 2.

又、液体還元剤用タンク１１のメンテナンスを行う際も、前記と同様に、上部旋回体２の外側から楽な姿勢で容易迅速に行うことができるので、液体還元剤用タンク１１のメンテナンス性が大幅に向上する。   Further, when the maintenance of the liquid reducing agent tank 11 is performed, it can be easily and quickly performed from the outside of the upper swing body 2 in an easy posture, so that the maintenance property of the liquid reducing agent tank 11 is improved. Greatly improved.

更に、液体還元剤用タンク１１は、断熱効果を有する所定厚さの合成樹脂により形成されているので、構成が簡単でありながら液体還元剤用タンクの保温性が向上する。従って、工具箱１５の上面開口部をカバー体１８で施蓋して、工具箱１５の中を密閉空間にできることと相俟って、尿素水溶液の凍結防止効果に寄与することができる。この場合、工具箱１５を合成樹脂により形成したときは、尿素水溶液の凍結防止効果が更に向上する。   Furthermore, since the liquid reducing agent tank 11 is formed of a synthetic resin having a predetermined thickness having a heat insulating effect, the heat retaining property of the liquid reducing agent tank is improved while the configuration is simple. Therefore, coupled with the fact that the upper surface opening of the tool box 15 is covered with the cover body 18 and the inside of the tool box 15 can be made a sealed space, it is possible to contribute to the antifreezing effect of the urea aqueous solution. In this case, when the tool box 15 is formed of a synthetic resin, the freeze prevention effect of the urea aqueous solution is further improved.

更に又、合成樹脂製の液体還元剤用タンク１１は工具箱１５のサイズに見合った形状寸法に簡単に製造でき、液体還元剤用タンク１１のレイアウトの自由度が高くなるメリットを有する。   Furthermore, the liquid reducing agent tank 11 made of synthetic resin can be easily manufactured in a shape corresponding to the size of the tool box 15, and has the merit of increasing the degree of freedom of the layout of the liquid reducing agent tank 11.

なお、本発明は、本発明の精神を逸脱しない限り種々の改変を為すことができ、そして、本発明が該改変されたものに及ぶことは当然である。   It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

本発明は、液体還元剤用タンクを搭載した建設機械であれば、液体還元剤用タンク内に尿素水溶液以外の液体還元剤を貯留したものにも適用可能である。   The present invention can also be applied to a construction machine equipped with a liquid reducing agent tank in which a liquid reducing agent other than an aqueous urea solution is stored in the liquid reducing agent tank.

２ 上部旋回体
７ エンジンルーム
８ ディーゼルエンジン
１０ 排ガス処理装置
１１ 液体還元剤用タンク
１４ 旋回フレーム
１５ 工具箱
１８ カバー体

2 Upper revolving structure 7 Engine room 8 Diesel engine 10 Exhaust gas treatment device 11 Liquid reducing agent tank 14 Revolving frame 15 Tool box 18 Cover body

Claims (2)

液体還元剤を貯留した液体還元剤用タンクが搭載された建設機械において、前記液体還元剤用タンクを合成樹脂により形成し、且つ、該液体還元剤用タンクを上部旋回体の外側部に配設された工具箱内に設置したことを特徴とする建設機械。   In a construction machine equipped with a liquid reducing agent tank that stores a liquid reducing agent, the liquid reducing agent tank is formed of a synthetic resin, and the liquid reducing agent tank is disposed on the outer side of the upper swing body. Construction machine characterized by being installed in a tool box. 上記工具箱は上面開口部を有し、該上面開口部をカバー体により開閉可能に施蓋したことを特徴とする請求項１記載の建設機械。
The construction machine according to claim 1, wherein the tool box has an upper surface opening, and the upper surface opening is covered with a cover body so as to be opened and closed.
JP2009160247A 2009-07-06 2009-07-06 Construction machine Pending JP2011012661A (en)

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