Adjustable Wear Pad Assembly for Telescopic Boom
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Solution Overview
Problem
Existing wear pad assemblies for telescopic booms require multiple shims of different thicknesses to accommodate varying tolerances, complicating assembly and requiring dismantling for adjustments as pads wear down, with limited contact area leading to inefficiencies.
Innovation Solution
A wear pad assembly with a rigid plate secured to one side, featuring a stud with mating formations to apply compressive force and prevent displacement, allowing for even surface contact and adjustment without shims or special tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If shims of different thickness are used to accommodate tolerance accumulation, then the wear pad can fit various locations, but the number of different parts increases and assembly becomes complicated
Solution Approach 1:
The rigid plate is designed with an adjustable position along the stud, allowing the wear pad thickness parameter to be changed without replacing shims. The stud can be positioned at different locations (e.g., different distances from the wear pad surface) to accommodate various clearance requirements, eliminating the need for multiple shim thicknesses while maintaining adaptability to tolerance variations
Solution Approach 2:
The single rigid plate with adjustable stud position serves multiple functions: it provides structural support, adjusts for different clearances, and eliminates the need for multiple shim components. This universal component replaces the previously required set of different thickness shims, reducing part variety while maintaining the ability to fit various locations
2Ease of operation
If shims are used to take up clearance between sections, then smooth sliding is enabled, but the clearance cannot be adjusted without dismantling the wear pad assemblies
Solution Approach 1:
The stud is designed to be movable along the rigid plate, allowing dynamic adjustment of the wear pad position and thickness compensation. This enables clearance adjustment without dismantling the entire assembly - the stud can be repositioned and locked at new locations, providing adaptability while simplifying maintenance operations
Solution Approach 2:
The adjustable stud mechanism allows preliminary adjustment of clearance settings before final assembly or during maintenance. The wear pad can be pre-positioned with the stud at the optimal location to accommodate anticipated wear patterns or clearance requirements, eliminating the need for dismantling and shim replacement during maintenance
3Strength
If only the surface area surrounding the insert is used to engage the inner section, then the wear pad can be secured, but larger wear pads are required
Solution Approach 1:
The engagement mechanism is extended from a two-dimensional annular surface around the insert to a three-dimensional configuration where the rigid plate and stud create additional engagement points. The stud protrudes through the rigid plate to contact the inner section, adding a new dimension of engagement that increases strength without requiring larger wear pad dimensions
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
Enables adjustable and durable wear pads with a larger contact area, simplifying installation and maintenance by eliminating the need for shims and special equipment, while providing better load-bearing capacity and longer pad life.
Implementation Method 1
The end of stud and the associated rigid plate having mating formations to enable the stud to urge the first surface of the wear pad against the outer wall of the inner section of the boom while preventing the wear pad from being displaced
Implementation Method 2
Each rigid plate serves to apply a compressive force evenly over the surface of the wear pad in contact with the inner section of the boom
Implementation Method 3
wear pads made of a suitable material such as nylon, are placed between the sections at the front and rear axial end of each section
Data Source
AI summary
A wear pad assembly for a telescopic boom includes a wear pad having a first side for contacting an outer wall of an inner section of the boom, and a second side facing an inner wall of an outer section of the boom. At least one rigid plate is secured to the second side of the wear pad, and a stud in screw-threaded engagement with the outer section of the boom or a plate secured to the outer section of the boom is associated with each rigid plate, the end of stud and the associated rigid plate having mating formations to enable the stud to urge the first surface of the wear pad against the outer wall of the inner section while preventing the wear pad from being displaced in a plane normal to the axis of rotation of the stud.