Pile Cropper Parallel Linkage for Consistent Fracture Plane Cutting
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Solution Overview
Problem
Current concrete pile cropping devices are inefficient as they apply cutting pressure at an angle not parallel to the desired fracture plane, wasting power and reducing the lifespan of cutting teeth, and struggle to effectively crop piles of varying thicknesses due to compromised mechanical force and pivot effects.
Innovation Solution
A pile cropping device with a body and hydraulically powered jaw featuring a parallel linkage that maintains the cutting tooth's orientation parallel to the desired fracture plane, independent of pile thickness, ensuring consistent cutting force direction and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between the centre of rotation and the cutting teeth is increased, then the cutting teeth can engage piles of varying thickness, but the mechanical force decreases due to the pivot effect
Solution Approach 1:
A parallel linkage mechanism is introduced as an intermediary between the hydraulic piston and the cutting tooth. This linkage transfers the hydraulic force while maintaining the cutting tooth's orientation parallel to the fracture plane, resolving the conflict between adaptability and force effectiveness.
Solution Approach 2:
The jaw assembly is designed to be dynamically adjustable through the parallel linkage, allowing the cutting tooth position and orientation to adapt to varying pile thicknesses while maintaining optimal cutting force direction throughout the cutting stroke.
2Adaptability or versatility
If the cutting pressure is applied at an angle not parallel to the desired fracture plane, then the device can accommodate varying pile dimensions, but power is wasted and cutting efficiency decreases
Solution Approach 1:
The parallel linkage acts as a mechanical intermediary that ensures the cutting tooth force vector remains parallel to the desired fracture plane, eliminating energy waste from angular misalignment while still accommodating varying pile dimensions through the jaw's rotational capability.
Solution Approach 2:
The system changes the orientation parameter of the cutting tooth dynamically through the parallel linkage mechanism, maintaining the optimal angle (parallel to fracture plane) regardless of pile thickness variations, thereby maximizing power usage efficiency.
3Device complexity
If the direction of applied hydraulic cutting force is not parallel to the cutting teeth throughout engagement, then the device structure is simpler, but the lifespan of cutting teeth decreases
Solution Approach 1:
The parallel linkage mechanism serves as an intermediary that redirects and equalizes the force distribution across the cutting tooth during engagement, preventing premature wear at specific points and extending tooth lifespan without significantly complicating the overall device structure.
4Adaptability or versatility
If a pivot point system is used to enable jaw rotation for varying pile thickness, then adaptability improves, but mechanical force is compromised due to the pivot effect
Solution Approach 1:
The parallel linkage mechanism intermediates between the pivot point system and the cutting tooth, compensating for the force loss from the pivot effect by mechanically amplifying or redirecting the hydraulic force to maintain adequate cutting force at the tooth while preserving the rotational adaptability.
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
This solution optimizes the cutting process by maintaining the cutting tooth's orientation parallel to the fracture plane, enhancing efficiency, reducing power consumption, and extending the lifespan of cutting teeth, while effectively cropping piles of varying thicknesses.
Implementation Method 1
The jaws are driven by hydraulic arms (14) and the internal parallel mechanism holds the tip of the teeth parallel to the desired plane of fracture of the concrete pile
Implementation Method 2
at least one cutting tooth in a hydraulically powered jaw including a parallel linkage to maintain the position of the tooth generally parallel to a desired plane of fracture in the concrete pile
Implementation Method 3
The concrete piles also contain steel reinforcing rods which need to be exposed in order that further building works can be structurally tied to the foundations. The need for these reinforcing rods mean that any cropping to the concrete needs to avoid severing the pile all the way through. Devices to crop need to fracture the concrete at a localised point
Data Source
AI summary
A pile cropping device comprising a body locatable around and/or in the region of a pile to be cropped, the body having one or more pile cropping teeth adapted, in use, to engage with and disengage from cladding and/or reinforcement of said pile, wherein at the point of engagement between the cropping tooth or teeth and the pile to be cropped, the planar orientation of the tooth or teeth relative to the axis of the pile remaining generally unaffected by variation in the thickness of said reinforcement and/or cladding to be cropped from the pile.