Boom Access Cover Mounting for Vibration-Damaged Fasteners
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Solution Overview
Problem
Existing cover devices for construction machines' front work devices are prone to damage due to vibration and impact during operations, leading to cracks and deformation, especially when fastened with bolts.
Innovation Solution
A cover device comprising a cover and brackets with vibration-damping rubbers, where the brackets are attached radially outside the access hole and fastened to the inner surface of the front work device, reducing vibration transmission and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover is fastened to the front work device with a fastener such as a bolt, then the cover can be securely attached to close the access hole, but vibration of the construction machine is transmitted to the fastener or the cover via the front work device, causing cracks, deformation, and breakage
Solution Approach 1:
A vibration-damping rubber is introduced as an intermediary element between the front work device and the cover fastening system. The rubber layer absorbs and dampens vibrations transmitted through the fasteners, preventing crack propagation and fastener breakage while maintaining secure attachment of the cover to the access hole
Solution Approach 2:
The vibration-damping rubber is pre-installed between the front work device and the cover fastening system to provide beforehand cushioning against vibrations and impacts. This preventive measure protects the fasteners and cover from vibration-induced damage before the damage can occur during construction machine operation
2Ease of operation
If the access hole is formed in the front work device for maintenance, then approach into the inside of the welded structure is enabled, but cracks around an insertion hole of the front work device may occur due to vibration and impact
Solution Approach 1:
The vibration-damping rubber acts as an intermediary that isolates the insertion hole region from vibration and impact forces. This protects the hole edges from crack initiation and propagation while maintaining the hole's functionality for maintenance access
Solution Approach 2:
The vibration-damping rubber is specifically positioned around the insertion hole area to provide localized protection. This targeted approach addresses the specific vulnerability of the hole region without affecting the overall structural integrity or maintenance accessibility of the front work device
3Reliability
If the cover is fastened directly to the front work device, then the cover can be securely attached, but deformation of the cover and breakage of the fastener may occur due to large vibration and impact received during excavation work
Solution Approach 1:
The vibration-damping rubber is integrated into the existing fastening system as an intermediary layer between the front work device and the cover. This simple addition provides vibration protection without significantly increasing fastening system complexity, maintaining secure cover attachment while preventing deformation and fastener breakage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively protects the cover and brackets from vibration-induced damage, maintaining structural integrity and ease of access, while minimizing gaps for dust and water ingress.
Implementation Method 1
a vibration-damping rubber is provided between the frame and the under cover, thereby reducing vibration transmitted from the frame to the fasteners and the under cover
Data Source
Figure 1
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AI summary
A cover device 40 includes: a cover 50 in contact with an outer surface 21a of a boom 21 (front work device 20) to close an access hole 30; and a bracket 60 located inside the boom 21, attached to the boom 21 via a screw seat 90, and detachably fastened to the cover, in which an attachment position between the bracket 60 and the boom 21 is at a position more distant than an outer peripheral edge 50a of the cover 50 with respect to the access hole 30, and an attachment position between the bracket 60 and the cover 50 is on a center 30b side with respect to an inner peripheral edge 30a of the access hole 30.