Actuator Mounting Unit That Relieves Boom-Induced Bending Moments
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Solution Overview
Problem
Existing actuator mounting arrangements in mining machines, particularly trunnion cylinders, suffer from reduced lifetime due to bending moments caused by sideways movement of booms, which is a common issue in heavy-duty applications.
Innovation Solution
An actuator mounting arrangement featuring a mining machine with a frame and a boom, utilizing a mounting unit comprising first and second parts with recesses for receiving protuberances from the actuator, allowing the actuator to move relative to the mounting unit, thereby reducing bending moments through a transverse encirclement and detachable bolt mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the actuator is rigidly mounted to the frame with fixed mounting positions, then the structural stability and load-bearing capacity are improved, but bending moments are generated during sideways movement of the boom which reduces the actuator lifetime
Solution Approach 1:
The mounting arrangement allows dynamic adjustment of the actuator's longitudinal position along the mounting unit. The actuator can move longitudinally within the mounting unit to accommodate sideways movement of the boom, converting the rigid fixed-position mounting into a dynamic adjustable mounting that absorbs lateral movements without generating damaging bending moments.
2Reliability
If the actuator mounting arrangement allows longitudinal movement to reduce bending moments, then the actuator lifetime is improved, but the assembly and maintenance complexity increases
Solution Approach 1:
The mounting arrangement is segmented into distinct components: a mounting unit with first and second mounting parts, through holes for positioning, and detachable mounting bolts. This segmentation allows the actuator to be easily assembled and disassembled while providing the necessary longitudinal movement capability, reducing the complexity compared to a fully integrated rigid mounting system.
Solution Approach 2:
The dynamic longitudinal adjustment capability is achieved through a simple mechanism where the actuator can slide or move along the mounting unit's longitudinal axis, constrained only by the through holes and detachable bolts. This dynamic feature is implemented with minimal additional components, avoiding excessive complexity.
3Ease of manufacture
If traditional rigid mounting is used, then the assembly process is simple and quick, but the bending moments during operation reduce the actuator lifetime
Solution Approach 1:
The mounting arrangement maintains assembly simplicity through its modular design with detachable bolts and clear positioning features (through holes and recesses). The dynamic longitudinal movement capability is built into the basic mounting structure without requiring complex adjustment mechanisms, allowing for quick assembly and disassembly while providing the necessary flexibility to eliminate bending moments during operation.
Data Source
AI summary
An actuator mounting arrangement includes a mining machine having a frame and at least one mounting unit. The mounting unit includes a first mounting part having at partial recess for partially receiving a protuberance extending from an outer surface of the actuator, and a second mounting part having a recess for partially receiving the protuberance. The recesses face each other and form a support surface for the protuberance. Each of the first mounting part and the second mounting part has a through hole for receiving the actuator so that the first mounting part and the second mounting part encircle the actuator in a plane transverse of an axis of the actuator in a mounted state. The first mounting part and the second mounting part have matching holes for mounting bolts with which the first mounting part and the second mounting part are detachably mounted together.