Demolition Shear Blade Holder Structure for Wear Protection and Unjamming
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Solution Overview
Problem
Conventional heavy-duty demolition shears face issues with jamming and wear on the main jaw bodies due to the lack of effective blade protection and unjamming mechanisms, leading to reduced efficiency and increased maintenance costs.
Innovation Solution
The implementation of detachable blade holders with wedge blocks and a lateral blade adjustment mechanism that securely mounts blade inserts, providing better wear protection and facilitating unjamming by allowing for lateral adjustment of the guide blade to enlarge the space between jaws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If blade inserts are directly mounted to main jaw bodies, then the structure is simpler, but the main jaw bodies suffer from wear and reduced lifespan
Solution Approach 1:
The mounting structure is segmented into three distinct components: the main jaw body, the blade holder, and the blade insert. The blade holder acts as an intermediate component that is detachably mounted to the jaw body and provides a mounting surface for the blade insert. This segmentation isolates the wear to the blade holder and blade insert, protecting the main jaw body from direct wear and extending its lifespan.
2Stability of the object's composition
If fixed blade inserts are used, then the structure is more stable, but the shears cannot be easily unjammed when material gets stuck
Solution Approach 1:
The blade holder is designed with dynamic adjustment capability through the wedge block mechanism. The wedge block can be adjusted laterally relative to the blade insert, allowing for dynamic modification of the blade insert's position within the jaw. This enables the system to transition from a fixed stable state to an adjusted state for unjamming operations, and then back to a stable operational state.
Solution Approach 2:
The wedge block serves as an intermediary mechanism between the adjustment force and the blade insert. By laterally adjusting the wedge block, the blade insert's position is modified, enabling unjamming. The wedge block mediates between the need for stable blade insertion and the need for adjustability, providing a mechanism that achieves both objectives.
3Strength
If wedge blocks with angled forces are used to secure blade inserts, then the blade insertion is more secure, but the mounting mechanism becomes more complex
Solution Approach 1:
The wedge block utilizes angular geometry to transform the mounting parameters. The wedge surfaces are angled relative to each other, creating a mechanical advantage that converts a relatively small lateral adjustment force into a large securing force on the blade insert. This parameter change from lateral position to securing force provides strong blade insertion security while keeping the adjustment mechanism relatively simple.
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 enhances the operational efficiency of heavy-duty demolition shears by reducing jamming incidents, extending the lifespan of the equipment, and minimizing maintenance needs through improved blade protection and unjamming capabilities.
Implementation Method 1
a wedge block having (a) a first wedge surface that engages a surface of the first jaw body, and (b) a second wedge surface that engages a surface of the first blade insert, and a fastener that mounts the wedge block to the first jaw, the fastener applying a force to the wedge block in a force-applying direction that is angled relative to one of the wedge surfaces such that (1) the force urges the first blade insert into engagement with first blade seat surface in the force-applying direction, and (2) the force urges, via the wedge surfaces, the first blade insert into engagement with the first blade seat surface in a direction different from the force-applying direction
Data Source
AI summary
Heavy-duty material processors (e.g., shears, concrete crushers) include a jaw that pivotally connects to another jaw. A hydraulic cylinder extends between the jaws to open and close the jaws in a shearing motion. Cutting/shearing/crushing blade inserts mount to detachable blade holders, which in turn mount to one of the jaws. Wedge blocks securely and detachably attach the blade inserts to the remainder of their associated jaw, and rely on force-amplifying wedge surfaces to ensure a secure attachment. The detachable blade holders may include lateral flanges that extend across an otherwise exposed face of their respective underlying jaw bodies to protect the jaw bodies during use. A blade on one of the jaws is laterally adjustable, which helps to free a jam if one of the jaws gets jammed into the space between blades in the other jaw.