Alternating Weight Hammer Drilling Apparatus
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Solution Overview
Problem
Conventional drilling apparatuses face challenges in precisely and efficiently transmitting hammering force to a shank rod due to unbalanced hammering forces, which limits the axial drilling efficiency and durability of the driving mechanism.
Innovation Solution
A drilling apparatus with multiple weight hammers and corresponding rotors, where each rotor is driven by the same mechanism, allowing even distribution of hammering force around the centerline of the shank rod, and the weight hammers are designed to alternately hammer regions near the centerline, ensuring balanced force transmission and reduced load fluctuations on the driving mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple weight hammers are used to increase hammering frequency, then productivity increases, but hammering force becomes unbalanced and transmission precision deteriorates
Solution Approach 1:
The patent applies asymmetry by designing weight hammers with different configurations - specifically, one weight hammer has a larger hammering surface area than the other. This asymmetric design allows the two hammers to complement each other, with the larger hammer providing primary hammering force and the smaller hammer filling in gaps and balancing the force distribution, thereby maintaining precision while enabling frequent hammering.
Solution Approach 2:
The patent segments the hammering function by dividing it into two separate weight hammers that operate alternately. Each hammer is responsible for specific portions of the hammering cycle, with their combined actions creating a continuous and balanced hammering force. This segmentation allows increased hammering frequency while maintaining force transmission precision through coordinated operation.
2Productivity
If rotors engage weight hammers to lift and drop them frequently, then productivity increases, but load fluctuations increase and driving mechanism durability decreases
Solution Approach 1:
The patent implements periodic action through the alternating engagement of two rotors with two weight hammers. While one rotor is engaging and lifting a weight hammer, the other rotor is disengaged, and vice versa. This periodic, alternating pattern smooths out load fluctuations on the driving mechanism compared to single-rotor continuous engagement, thereby improving reliability while maintaining high hammering frequency.
Solution Approach 2:
The patent applies dynamics by designing the rotor-weight hammer engagement system to be highly dynamic and adaptable. The rotors can selectively engage and disengage from weight hammers based on operational phase, allowing the system to optimize between frequent hammering and load smoothing. This dynamic engagement strategy protects the driving mechanism from excessive load fluctuations while maintaining productivity.
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 design enables efficient axial drilling with reduced loss of hammering force and improved durability by evenly applying hammering force around the centerline, increasing the number of hammering events per unit time while minimizing load fluctuations on the driving mechanism.
Implementation Method 1
a compression spring for applying a biasing force to the weight hammer
Implementation Method 2
a hammering force obtained by adding a biasing force of the compression spring to a hammering force generated upon falling of each of the weight hammers
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A plurality of weight hammers (7,8) are provided, and each of the plurality of weight hammers has a shape for substantially evenly applying a hammering force with respect to a surface to be hammered of an object to be hammered (11), about a center line of the object to be hammered. Rotors (9, 10) for driving the weight hammers (7,8) are provided to the same rotating shaft (22) in such a positional relation that an engagement claw (9a) of one rotor (9) engages and drives one weight hammer (7), and, when engagement of the weight hammer (7) is released, an engagement claw (10a) of another rotor (10) in driving engages another weight hammer (8). The rotors are driven by the same driving means (26).