Telescopic Boom Wear Pad Assembly With Locking Threaded Positions
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Solution Overview
Problem
Existing wear pad assemblies for telescopic booms in work machines require extensive force and multiple steps for adjustment, and existing solutions are not feasible for machines with high loads due to insufficient friction locking, leading to frequent replacements and high maintenance costs.
Innovation Solution
A wear pad assembly featuring a threaded boss and bolt with locking means that allow for easy adjustment by unlocking, rotating, and relocking in different engagement positions, providing a simple and cost-effective method to adjust the wear pad position, ensuring secure locking even under high loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wear pads are replaced frequently to maintain performance, then reliability is improved, but loss of time and productivity deteriorate due to frequent maintenance interruptions
Solution Approach 1:
The wear pad position is adjusted by changing the engagement position of the threaded bolt with the threaded boss, allowing the wear pad to be repositioned along the telescopic boom segment. This extends the usable life of wear pads by enabling their continued use after partial wear through positional adjustment rather than replacement
2Productivity
If adjustable wear pad assemblies are used to extend maintenance intervals, then productivity is improved, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The adjustment mechanism is divided into distinct functional components: a threaded boss fixed to the boom segment, a threaded bolt for adjustment, and locking means. This segmentation allows each component to perform its specific function simply, with the threaded bolt providing adjustment through rotation and the locking means securing the position, avoiding the need for complex integrated adjustment systems
Solution Approach 2:
The adjustment mechanism replaces complex mechanical adjustment systems with a simple threaded engagement system. The threaded bolt and boss provide precise positional adjustment through rotation, while the locking means (such as a cotter pin or lock nut) secures the position, eliminating the need for complex clamps, welds, or multi-step mechanical fastening systems
3Reliability
If wear pads are secured with high friction locking, then reliability under high loads is improved, but ease of operation deteriorates due to extensive force required for adjustment
Solution Approach 1:
The locking mechanism transitions between two dynamic states: an unlocked state where the threaded bolt can be easily rotated for adjustment, and a locked state where the locking means secures the bolt in place. This dynamic switching allows the system to be easy to adjust when needed while providing secure locking during operation, resolving the contradiction between adjustability and locking security
4Adaptability or versatility
If multiple interfaces are used in adjustable wear pad assemblies, then adaptability is improved, but ease of operation deteriorates due to requirement for clean environment during adjustment
Solution Approach 1:
The locking function is extracted as a separate, simple operation from the adjustment process. The locking means (such as a cotter pin, lock nut, or retaining clip) can be independently installed or removed without affecting the threaded engagement itself. This allows adjustment to be performed by simply rotating the threaded bolt, while locking is a separate, simple step, eliminating the need for complex multi-interface alignment and clean environment requirements
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 enables convenient and reliable adjustment of wear pads, extending maintenance intervals and reducing costs by allowing precise positioning and secure locking, thereby improving the lifespan and performance of telescopic boom systems.
Implementation Method 1
a threaded bolt (14) configured for threaded engagement with the threaded boss (12)
Implementation Method 2
locking means (18) configured to lock the threaded boss (12) and the threaded bolt (14) in a first engagement position (P1) and at least a further engagement position (P2)
Data Source
AI summary
The present invention pertains to a wear pad assembly for adjusting a position of a wear pad in a telescopic boom of a work machine, comprising a threaded boss, a threaded bolt configured for threaded engagement with the threaded boss and a wear pad connectable to the threaded bolt. The wear pad assembly further comprises locking means configured to lock the threaded boss and the threaded bolt in a first engagement position and at least a further engagement position. The present invention further pertains to a method of adjusting such a wear pad assembly, the wear pad assembly being mounted to a first telescopic boom segment such that the wear pad provides a sliding surface for a second telescopic boom segment, the method comprising the steps of unlocking the threaded bolt by disassembling at least a part of the locking means, rotating the threaded bolt from the first engagement position into the further engagement position, and locking the threaded bolt in the further engagement position by reassembling the disassembled locking means when the threaded bolt is in the further engagement position.