Wedge Block Mounting for Shear Blade Inserts
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Solution Overview
Problem
Conventional heavy-duty demolition shears lack effective mechanisms for securely mounting blade inserts and addressing jamming issues, particularly in terms of wear protection and unjamming, due to the absence of symmetric and non-symmetric wedge surfaces and inadequate relative dimensions in prior art designs.
Innovation Solution
The use of detachable blade holders with wedge blocks and a lateral adjustment mechanism to securely mount and adjust blade inserts, featuring wedge surfaces that form non-zero acute angles to enhance engagement and prevent jamming, along with a piston/cylinder system for pivotal movement and a jackscrew for lateral actuation to unjam the shears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mounting mechanisms are used for blade inserts, then the structure is simpler, but the wear protection and secure engagement are insufficient
Solution Approach 1:
The wedge block incorporates asymmetric surfaces including a symmetric wedge surface and a non-symmetric cam surface. The cam surface has a specific profile that interacts with a corresponding surface on the blade insert, creating a mechanical interlock that prevents rotation and ensures secure engagement. This asymmetric design provides reliable blade insert retention while maintaining reasonable structural complexity.
Solution Approach 2:
The wedge block is pre-positioned in the jaw body with its surfaces prepared to receive the blade insert. The symmetric wedge surface and non-symmetric cam surface are pre-configured to automatically guide and secure the blade insert when the fastener is tightened, eliminating the need for complex alignment procedures during installation.
2Reliability
If blade inserts are made smaller to fit detachable holders, then wear protection for main jaw bodies is improved, but the cutting capacity may be reduced
Solution Approach 1:
The blade mounting system is segmented into detachable components: the wedge block, the blade insert, and the holder. This segmentation allows the blade insert to be separated from the main jaw body, concentrating wear on the replaceable insert rather than the expensive jaw body. The segmented design maintains full cutting capacity through the blade insert while protecting the jaw body from wear.
Solution Approach 2:
The blade insert is designed as a consumable component that can be discarded when worn and replaced with a fresh insert. The wedge block and holder are recovered and reused. This approach protects the main jaw body from wear while maintaining cutting productivity through easy replacement of the blade insert.
3Reliability
If wedge surfaces form non-zero acute angles, then engagement and unjamming capability are enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The wedge block features a symmetric wedge surface at a standard 45-degree angle and a non-symmetric cam surface with a specific profile. The asymmetric cam surface provides the mechanical advantage for unjamming while the symmetric wedge surface maintains simple, precise manufacturing. This combination achieves enhanced unjamming capability without excessively increasing manufacturing precision requirements.
4Reliability
If a lateral adjustment mechanism is added, then unjamming capability is improved, but device complexity increases
Solution Approach 1:
The lateral adjustment mechanism is merged with the existing wedge block and fastener assembly. The cam surface on the wedge block provides lateral movement capability that integrates with the vertical clamping function. This merging approach provides unjamming capability without adding a completely separate lateral adjustment mechanism, thus limiting the increase in device complexity.
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 provides improved wear protection, secure blade engagement, and efficient unjamming capabilities, enhancing the operational reliability and effectiveness of heavy-duty demolition shears by utilizing wedge blocks and a lateral actuator to manage blade positioning and prevent jamming.
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
Implementation Method 2
a piston/cylinder operatively connected to the first and second jaws and configured to pivotally drive the at least one of the jaws relative to the other jaw
Implementation Method 3
a lateral actuator that is configured to selectively move the second guide blade relative to the second material-processing surface feature so as change a lateral width of the space
Data Source
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AI summary
Blade inserts (2000, 2200) for heavy-duty shearers are disclosed which are shaped and configured to be mounted to a jaw (200) of a material processor by a wedge block (2010, 2210), the insert having insert body with a through-hole (2020) and first and second surfaces disposed on opposite sides thereof. The blade insert is shaped and configured to be mounted to the jaw by the wedge block (2010, 2210) extending into the through-hole. The blade insert and the wedge block have mating frustoconical surfaces (2020a, 2010b, 2220b, 2210e).