Demolition Jaw Blade Layout for Reinforced Concrete Cutting
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Solution Overview
Problem
Current concrete demolition tools, such as concrete shears, face difficulties in efficiently cutting reinforced concrete due to dulling blades and awkward jaw orientations, which reduce productivity and increase the challenge of handling large metal profiles and edge beams, especially when attached to an excavator.
Innovation Solution
A demolition device with separate crushing, cutting, and combination blades that can be attached to a utility machine, featuring abutment surface parts for power transmission between blades, allowing for efficient crushing, cutting, and grinding operations without the need for frequent blade changes, and enabling better alignment and control during demolition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If concrete shears use subsequent blades for crushing concrete and cutting metal, then the device can handle both materials, but the concrete dulls the metal cutting blades and reduces productivity
Solution Approach 1:
The jaw is divided into separate crushing blades and cutting blades that are not subsequent to each other, allowing each blade type to perform its dedicated function without interference. The crushing blades have a first arrangement and cutting blades have a second arrangement, preventing concrete from contacting the metal cutting blades.
Solution Approach 2:
The harmful element (concrete) is extracted from the path of the metal cutting blades by changing the spatial arrangement. The crushing blades are positioned to handle concrete separately, so that only metal contacts the cutting blades, preventing dulling and maintaining productivity.
2Device complexity
If the jaws open downwards or nearly straight downwards, then the structure is simple, but it becomes difficult to align the concrete shears with an excavator and reduces maneuverability
Solution Approach 1:
The jaw structure is made adjustable rather than fixed. The jaw opening direction can be changed during operation to suit different demolition scenarios and excavator positions, improving ease of operation without significantly increasing structural complexity through adjustable mechanisms.
3Area of stationary object
If the excavator works with its boom extended to reach edge beams, then the working area increases, but the center of gravity moves closer to the equilibrium point making control difficult and slowing work
Solution Approach 1:
The jaw opening direction is made adjustable to optimize the excavator's working position. By changing the jaw orientation, the excavator can maintain a more favorable center of gravity position while still accessing edge beams, improving both control and work speed without sacrificing working area.
4Reliability
If separate jaws are used for concrete and metal, then each jaw is optimized for its material, but changing blades takes ten minutes to a couple of days and reduces productivity
Solution Approach 1:
Crushing blades and cutting blades are combined in the same jaw structure, allowing both functions to be performed without changing jaws. The jaw contains both types of blades arranged in different patterns, enabling seamless transition between concrete crushing and metal cutting operations.
Solution Approach 2:
The jaw is designed as a multi-functional component that can handle both concrete and metal simultaneously or sequentially. By integrating both crushing and cutting capabilities in one jaw, the device achieves versatility without requiring multiple specialized jaws, maintaining work fluency and productivity.
5Volume of moving object
If subsequent blades are used for concrete and metal, then the device structure is compact, but it becomes difficult to cut large metal profiles as they cannot be positioned in the affected area
Solution Approach 1:
The jaw is segmented into distinct crushing and cutting blade sections with different arrangements. This segmentation allows large metal profiles to be positioned appropriately for cutting operations, as the cutting blades are arranged to accommodate larger workpieces rather than being constrained by a subsequent blade configuration.
Data Source
AI summary
The application relates to a demolition device for demolishing a concrete structure according to one embodiment. The device has a crushing blade for crushing concrete, and a cutting blade for cutting metal or a pulverizing blade for grinding concrete, and a combination blade. The device can be attached to a utility machine in a detachable manner. The crushing and cutting/pulverizing blade are separate blades from each other. The combination blade is adapted to be used for crushing concrete with the crushing blade. The combination blade is adapted to be used for cutting metal with the cutting blade or for grinding concrete with the pulverizing blade. The combination blade has abutment surface parts for the crushing and cutting/pulverizing blade. The abutment surface part for the cutting/pulverizing blade makes possible a power transmission between the cutting/pulverizing and combination blade when using the combination blade for crushing concrete. The abutment surface part for the crushing blade makes possible a power transmission between the crushing and combination blade when using the combination blade for cutting metal or grinding concrete.