Hydraulic Excavator Reducing Agent Pipe Routing
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Solution Overview
Problem
The existing arrangement of reducing agent tanks and pipes in hydraulic excavators is vulnerable to heat effects, leading to slow reducing agent supply and potential damage due to prolonged pipe lengths and interference with other components, especially in high-temperature environments.
Innovation Solution
The reducing agent tank is positioned outside the engine compartment, and the reducing agent pipe is routed through the inner space of a pipe frame and column members to minimize heat exposure and protect the pipe from damage, with strategic placement to reduce length and avoid interference with other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the reducing agent tank is arranged outside the engine compartment to avoid high-temperature environment, then the heat effects on the reducing agent in the tank are reduced, but the length of the reducing agent pipe is lengthened which increases heat exposure and vulnerability to damage
Solution Approach 1:
The reducing agent pipe is nested within the pipe frame structure, utilizing the existing spatial framework of the excavator. The pipe frame serves as a protective conduit that guides and shields the reducing agent pipe from external heat sources and physical damage, effectively solving the contradiction by providing a protected transmission path that extends beyond the engine compartment while minimizing heat exposure
Solution Approach 2:
The pipe frame acts as an intermediary structure between the reducing agent tank and the selective catalytic reduction apparatus. It provides a protected pathway that mediates the conflict between needing a long pipe (to avoid heat) and minimizing heat exposure, by offering thermal and mechanical protection along the extended pipe route
2Temperature
If the reducing agent pipe is lengthened to connect the tank outside the engine compartment, then the heat effects on the reducing agent are reduced, but the pipe becomes more vulnerable to damage from external factors and interference with other members
Solution Approach 1:
The reducing agent pipe is nested within the pipe frame structure, which provides both mechanical protection and spatial organization. This nesting arrangement protects the pipe from external damage while maintaining the necessary length to avoid heat sources
Solution Approach 2:
The pipe frame structure serves as a protective shell or conduit that encloses and protects the reducing agent pipe. This protective framework shields the pipe from external factors and potential interference with other excavator members, enhancing reliability while allowing the pipe to extend outside the engine compartment
3Reliability
If the reducing agent pipe is arranged to pass through the inner space of the pipe frame, then the pipe is protected from damage and heat effects are reduced, but the arrangement complexity increases
Solution Approach 1:
The pipe frame is designed to serve multiple functions: it provides structural support for the excavator, guides and protects the reducing agent pipe, and offers thermal insulation. By making the pipe frame multi-functional, the design avoids adding separate protective structures, thereby reducing overall arrangement complexity while achieving pipe protection
Solution Approach 2:
The protective function for the reducing agent pipe is merged with the existing pipe frame structure. Instead of creating a separate protection system, the design combines the pipe routing and protection functions into the single integrated pipe frame, simplifying the overall arrangement while maintaining reliability
Data Source
AI summary
An exhaust processing unit includes a selective catalytic reduction apparatus which processes exhaust from an engine. A reducing agent injection apparatus is attached to the exhaust processing unit. The reducing agent injection apparatus injects a reducing agent which is supplied to the selective catalytic reduction apparatus. The reducing agent tank and the reducing agent supply pump are arranged outside the engine compartment. The reducing agent tank retains the reducing agent. The reducing agent supply pump supplies the reducing agent from the reducing agent tank to the reducing agent injection apparatus. The reducing agent pipe connects the reducing agent supply pump and the reducing agent injection apparatus. The revolving frame includes a pipe frame. The reducing agent pipe is arranged from the reducing agent supply pump to the reducing agent injection apparatus so as to pass through the inner space of the pipe frame.