JP4855491B2 - Construction machinery - Google Patents
Construction machinery Download PDFInfo
- Publication number
- JP4855491B2 JP4855491B2 JP2009083570A JP2009083570A JP4855491B2 JP 4855491 B2 JP4855491 B2 JP 4855491B2 JP 2009083570 A JP2009083570 A JP 2009083570A JP 2009083570 A JP2009083570 A JP 2009083570A JP 4855491 B2 JP4855491 B2 JP 4855491B2
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- liquid reducing
- agent tank
- liquid
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000010276 construction Methods 0.000 title claims description 12
- 239000007788 liquids Substances 0.000 claims description 63
- 239000003638 reducing agents Substances 0.000 claims description 62
- 229930014058 Urea Natural products 0.000 description 15
- 239000004202 carbamide Substances 0.000 description 15
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound 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NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 15
- 239000007864 aqueous solutions Substances 0.000 description 10
- 239000011901 water Substances 0.000 description 7
- 280000711007 Swivel companies 0.000 description 6
- 229910002089 NOx Inorganic materials 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 239000002184 metals Substances 0.000 description 3
- 229910052751 metals Inorganic materials 0.000 description 3
- 239000000243 solutions Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 materials Substances 0.000 description 2
- 239000004698 Polyethylene (PE) Substances 0.000 description 1
- 239000003054 catalysts Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000011514 iron Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007769 metal materials Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylenes Polymers 0.000 description 1
- 229920005989 resins Polymers 0.000 description 1
- 239000011347 resins Substances 0.000 description 1
- 229920003002 synthetic resins Polymers 0.000 description 1
- 239000000057 synthetic resins Substances 0.000 description 1
Description
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.
In recent years, construction equipment such as hydraulic excavators equipped with diesel engines has been equipped with exhaust gas treatment devices in the exhaust system of diesel engines to meet higher exhaust gas regulations. Is released into the atmosphere through the NOx reduction catalyst provided in
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).
The liquid reducing agent tank is installed in a narrow space of the upper swing body. Therefore, when the aqueous solution of urea is supplied to the liquid reducing agent tank or when maintenance work is performed on the liquid reducing agent tank, the operator is forced to take an unnatural work posture. There was a problem that workability and maintenance workability were not good.
In addition, the urea aqueous solution stored in the metal liquid reducing agent tank is likely to be frozen when the temperature is below freezing, and when it is frozen, the urea aqueous solution cannot be used as the liquid reducing agent.
In order to prevent the urea aqueous solution from freezing, for example, the liquid reductant tank may be heated with an electric heater to increase the heat retaining performance. However, with this configuration, the structure becomes complicated and the equipment cost increases. The consumption of electrical energy increases.
Therefore, there is a technical problem to be solved in order to improve water supply, maintenance performance and heat retention of the liquid reducing agent tank without complicating the configuration, and the present invention solves this problem. With the goal.
The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that a pair of left and right work implement mounting support brackets are erected on the front portion of the swivel frame, and the liquid reduction In a construction machine equipped with a liquid reducing agent tank storing an agent, the liquid reducing agent tank is installed beside a turning motor in a space between the pair of left and right support brackets. I will provide a.
According to this configuration, the liquid reducing agent tank is a space between the pair of left and right support brackets erected on the front portion of the swivel frame, and is disposed so as to be lateral to the swivel motor. ing. Therefore, when the liquid reducing agent tank is replenished or when the liquid reducing agent tank is maintained, the work can be easily performed from above the space portion of the support bracket.
The invention according to claim 1 can be easily and quickly performed from above the support bracket when replenishing the liquid reducing agent tank or when performing maintenance of the liquid reducing agent tank. Water supply and maintainability of the liquid reducing agent tank can be improved.
During operation of the construction machine, the liquid reducing agent tank is warmed by heat radiation from the turning motor. Accordingly, the heat retention of the liquid reducing agent tank can be improved without providing a heater, and the liquid reducing agent can be prevented from freezing while the configuration is simple.
In the present invention, in order to achieve the purpose of improving the water supply, maintenance performance and heat retention of the liquid reducing agent tank, a pair of left and right work equipment mounting support brackets are erected on the front of the swivel frame, In addition, in a construction machine equipped with a liquid reducing agent tank that stores the liquid reducing agent, the liquid reducing agent tank is installed beside the swivel motor in the space between the pair of left and right support brackets. did.
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.
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 in front of the diesel engine 8 (front side in FIG. 2), and a heat exchanger unit 13 including a radiator and the like is installed in front of the cooling fan 12.
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.
As shown in FIG. 3, a pair of left and right boom mounting support brackets 17, 17 are erected on the front portion of the swing frame 14 of the upper swing body 2, and a swing motor is interposed between the support brackets 17, 17. 16 is provided. Further, a metal liquid reducing agent tank 11 is disposed laterally (in the left-right width direction of the body, that is, the LR direction in FIG. 3) of the turning motor 16 in the space in the pair of left and right support brackets 17 and 17. The liquid reducing agent tank 11 is formed in a flat box shape.
Further, an aqueous urea solution is stored in the liquid reducing agent tank 11. The liquid reducing agent tank 11 is connected to the exhaust gas treatment device 10 via a liquid reducing agent supply pipe (not shown).
The material of the liquid reducing agent tank 11 is not limited to a metal material such as iron but may be a synthetic resin material. For example, the liquid reducing agent tank 11 can be made of polyethylene resin having a required heat insulating property. The shape of the liquid reducing agent tank 11 is not limited to a box shape, and can be set to an arbitrary shape depending on conditions such as installation space.
In this embodiment, a water supply port (not shown) is opened on the upper surface of the liquid reducing agent tank 11, and a cap 19 is attached to the water supply port. Reference numeral 18 denotes an inclined plate fixed to the inner surfaces of the front portions of the support brackets 17 and 17.
As described above, according to the present invention, the liquid reducing agent tank 11 is installed in the space between the pair of left and right support brackets 17, 17 erected on the front part of the swivel frame 14. The space part (dead space) between 17 can be used effectively.
Further, since the liquid reducing agent tank 11 is installed on the side of the turning motor 16, a large working space is secured above the liquid reducing agent tank 11. Therefore, when the urea aqueous solution is replenished to the water supply port of the liquid reducing agent tank 11, the urea aqueous solution can be replenished easily and quickly from above the liquid reducing agent tank 11.
In addition, when the maintenance and inspection of the liquid reducing agent tank 11 is performed, it can be easily and quickly performed from above the liquid reducing agent tank 11 as described above. Thus, according to the present invention, not only the water supply of the liquid reducing agent tank 11 is improved, but also the maintainability of the liquid reducing agent tank 11 is improved.
Further, when the liquid reducing agent tank 11 is made of metal, heat is released from the turning motor 16 during operation of the hydraulic excavator, and thus the liquid reducing agent tank 11 is warmed by this heat. As a result, the heat retention of the liquid reducing agent tank 11 is improved without providing a heating device such as a heater in the liquid reducing agent tank 11. Therefore, it is possible to prevent the urea aqueous solution in the liquid reducing agent tank 11 from being frozen even in a cold state, although the configuration is simple.
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.
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 Upper swing body 7 Engine room 8 Diesel engine 10 Exhaust gas treatment device 11 Liquid reducing agent tank 14 Swing frame 16 Swing motor 17 Support bracket
Claims (1)
- In a construction machine in which a support bracket for mounting a pair of left and right work machines is erected on the front portion of the revolving frame, and a liquid reducing agent tank storing a liquid reducing agent is mounted, the liquid reducing agent tank is A construction machine characterized in that it is installed on a side of a turning motor in a space between a pair of left and right support brackets.
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| JP2009083570A JP4855491B2 (en) | 2009-03-30 | 2009-03-30 | Construction machinery |
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| JP2009083570A JP4855491B2 (en) | 2009-03-30 | 2009-03-30 | Construction machinery |
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| JP4855491B2 true JP4855491B2 (en) | 2012-01-18 |
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| JP2003020936A (en) * | 2001-07-03 | 2003-01-24 | Komatsu Ltd | ARRANGEMENT STRUCTURE FOR LIQUID REDUCING AGENT TANK FOR NOx REDUCTION CATALYST |
| JP2008240676A (en) * | 2007-03-28 | 2008-10-09 | Komatsu Ltd | Construction vehicle |
| JP5273933B2 (en) * | 2007-03-28 | 2013-08-28 | 株式会社小松製作所 | Construction vehicle |
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