Excavator Swing Post Guide Plate for Hydraulic Hose Interference
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Solution Overview
Problem
In construction machines like compact excavators, the boom swing bracket is often positioned away from the front structure to avoid interference with hydraulic hoses, leading to increased moment and weight requirements for counterweights, which restricts miniaturization and weight reduction.
Innovation Solution
A first guide portion, such as a guide plate with an inclined plate portion, and a second guide portion, like a rod, are integrated into the swing post to restrict and guide hydraulic hoses downwards, preventing interference with the front structure and allowing the swing post to be positioned closer, thus reducing the counterweight and machine size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the boom swing bracket is positioned away from the front structure to avoid hydraulic hose interference, then the hydraulic hoses can be prevented from interfering with the structure, but the reach becomes longer and the moment becomes larger requiring a heavier counterweight
Solution Approach 1:
A guide portion is introduced as an intermediary component between the hydraulic hose and the front structure. This guide portion restricts the expansion of the hydraulic hose, preventing it from contacting the handrail while allowing the boom swing bracket to be positioned closer to the front structure, thereby reducing the counterweight weight
2Reliability
If the boom swing bracket is positioned away from the front structure, then the hydraulic hoses can be prevented from interfering with the structure, but the distance between the center line of rotation and the distal end of the working device becomes longer
Solution Approach 1:
The guide portion acts as a mediator that constrains the hydraulic hose's expansion path. By positioning the guide portion between the hose and the handrail, the boom swing bracket can be moved closer to the front structure without causing hose interference, thus shortening the reach distance
3Weight of moving object
If the swing post is positioned closer to the front structure, then the reach and moment are reduced allowing for a lighter counterweight, but the hydraulic hoses may interfere with the structure when the boom is raised
Solution Approach 1:
The guide portion is positioned between the hydraulic hose and the front structure to serve as a protective intermediary. It restricts the hose's expansion when the boom is raised, preventing contact with the handrail while allowing the swing post to be positioned closer to the front structure for reduced counterweight weight
Solution Approach 2:
The guide portion is pre-installed on the swing post before operation. It proactively restricts the hydraulic hose's expansion path in advance, preventing potential interference with the handrail before it can occur during boom operation
Data Source
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AI summary
A compact excavator including: a swing post (3) which is attached to a upperstructure (2) and which can swing in a left/right direction; a working device (4) which is attached to the swing post (3) and which includes a boom cylinder (5a), etc.; a counterweight (10) which is disposed in a rear part of the upperstructure (2) ; and hydraulic hoses (14) which extend upwards between opposite side plates (3a and 3b) of the swing post (3), and through which pressure oil for driving the boom cylinder (5a), etc. of the working device (4) is guided; wherein: the compact excavator further includes a guide plate (20) which is provided in the swing post (3), and which guides the hydraulic hoses (14) downwards while restricting the hydraulic hoses (14) from moving to approach a handrail (11) when the hydraulic hoses (14) attempt to expand toward the handrail (11) due to driving of the working device (4). With this configuration, it is possible to allow the swing post to be arranged close to a structure disposed in a position on a front face of a body without causing interference between expansion sections of the hydraulic hoses and the aforementioned structure.