Double-Acting Demolition Jaws With Variable Fulcrums for Crushing and Cutting
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Solution Overview
Problem
Existing demolition devices for structures, particularly those mounted on utility work machines, face inefficiencies in crushing and cutting due to limited maximum crushing force, blade dullness, and difficulty in cutting large metal profiles, leading to reduced productivity and frequent implement replacements.
Innovation Solution
A double acting demolition device with separate crushing and cutting jaws that can be combined to form additional jaws, allowing for variable geometry operations. The device uses a cylinder to generate maximum force at different angles for crushing and cutting, enabling efficient handling of various materials by altering the fulcrum points for each operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single jaw configuration is used for both crushing and cutting operations, then the device complexity is reduced, but the productivity decreases due to frequent implement replacements
Solution Approach 1:
The jaw is divided into separate functional modules: a crushing jaw with teeth for concrete demolition and a cutting jaw with blades for metal cutting. These modular components can be independently selected and attached based on the specific demolition task, allowing frequent replacement of only the required component rather than the entire jaw assembly.
Solution Approach 2:
The jaw assembly is designed with universal mounting interfaces that accept both crushing jaws and cutting jaws on the same frame. The hydraulic cylinder system is configured to provide effective force for both crushing and cutting operations, enabling a single device to perform multiple demolition functions without requiring complete implement replacement.
2Force
If the maximum crushing force is timed to occur at the final stage of cutting motion, then the cutting force is optimized, but the crushing efficiency is reduced as concrete cannot be crushed with full force when jaws are open
Solution Approach 1:
The hydraulic cylinder is positioned and configured to dynamically adjust the timing and direction of force application. For crushing operations, the cylinder provides maximum force when the jaws are fully open to maximize crushing capability. For cutting operations, the cylinder's force vector is oriented to provide optimal cutting force at the final stage of the cutting motion, with the ability to adapt between these different force timing requirements based on the operational mode.
Solution Approach 2:
The system changes the operational parameters of the hydraulic cylinder including the angle of force application, the timing of maximum force delivery, and the stroke configuration. These parameter changes allow the same hydraulic system to optimize both crushing force (when jaws are open) and cutting force (at final stage), eliminating the trade-off between the two operations.
3Device complexity
If short metal blades are used at the base of the jaw, then the device complexity is reduced, but the ease of operation is worsened due to difficulty in bringing large metal profiles into the coverage range
Solution Approach 1:
The cutting capability is extended from the traditional base-of-jaw position to multiple positions along the jaw structure. Long cutting blades are mounted not only at the base but also at intermediate positions and at the tip of the crushing jaw, creating a multi-dimensional cutting coverage area. This allows large metal profiles to be engaged at various points along the jaw's length, significantly improving accessibility and ease of operation for different profile sizes and positions.
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 efficiency and productivity of demolition operations by maintaining maximum force at optimal angles for both crushing and cutting, reducing blade wear and the need for frequent replacements, and allowing for versatile handling of materials like concrete, metal, and wood.
Implementation Method 1
The device uses a cylinder to generate maximum force at different angles for crushing and cutting, enabling efficient handling of various materials by altering the fulcrum points for each operation.
Data Source
Figure 0a~2a
Figure 2b~3b
AI summary
The application relates to a double acting demolition device (100) according to one embodiment for demolishing structures. The device includes a first crushing jaw (104) for crushing operation, a first cutting jaw (105) for cutting operation, and a combination jaw (109). The first jaws are separate jaws. The combination jaw is attachable to the first cutting jaw for constructing a second crushing jaw (205) and to the first crushing jaw for constructing a second cutting jaw (304). The second crushing jaw is used jointly with the first crushing jaw in crushing operation and the second cutting jaw is used jointly with the first cutting jaw in cutting operation. In crushing operation, the first crushing jaw rotates around a fulcrum (113) other than that of the second cutting jaw in cutting operation.