Excavator Bits With Staggered Impact For Low Vibration
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Solution Overview
Problem
Conventional down-the-hole hammers generate high levels of vibration and noise during excavation, making them unsuitable for use in densely populated areas and inefficient in terms of construction time.
Innovation Solution
An excavating apparatus with smaller diameter bits and a rotary body that uses a working fluid to impart staggered impact forces, reducing vibration and noise through controlled fluid distribution and isolation, and incorporating vibration and sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional down-the-hole hammer uses a single large-diameter hammer bit to excavate hard soil foundations, then excavation efficiency is improved, but vibration and noise levels increase significantly
Solution Approach 1:
The invention divides the single large-diameter hammer bit into multiple smaller-diameter hammer bits (typically 3-5 bits arranged in a circle). Each bit operates independently with staggered timing, achieving segmentation of the excavation function. This reduces the impact force per bit while maintaining overall excavation efficiency through combined action of multiple bits.
Solution Approach 2:
The invention implements periodic action by controlling the hammer bits to operate in a staggered sequence rather than simultaneously. The control system activates each bit alternately with controlled time intervals, creating periodic impact patterns that reduce cumulative vibration and noise while maintaining continuous excavation progress.
2Object-generated harmful factors
If multiple hammer bits are used with staggered impact timing, then vibration and noise levels are reduced, but the complexity of the control system increases
Solution Approach 1:
The invention employs a self-service control mechanism where the control system automatically manages the staggered activation sequence of multiple hammer bits based on pre-programmed timing parameters. The system self-regulates the periodic activation without requiring complex real-time monitoring or manual intervention, reducing operational complexity while achieving vibration reduction.
3Object-generated harmful factors
If multiple piston case members are used to drive multiple bits, then staggered impact can be achieved, but the device structure becomes more complex
Solution Approach 1:
The invention merges multiple piston case members into a unified structural assembly where they are radially arranged around a common axis. The piston cases share common structural elements such as the housing, sealing systems, and fluid distribution manifolds, reducing overall structural complexity while enabling staggered operation through independent control ports.
Solution Approach 2:
The piston case members are designed with universal characteristics, where each case serves the same functional purpose (driving a hammer bit) but can be independently controlled. The standardized design allows any piston case to be activated in sequence, providing multi-functional capability for vibration reduction while simplifying manufacturing and maintenance.
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
The apparatus enables efficient excavation with reduced vibration and noise, suitable for urban areas and compact construction setups, while minimizing the number of construction days required.
Implementation Method 1
piston case members, which correspond to the number of the bits and a plurality of which are housed inside the excavating apparatus main body, with built-in pistons that impart strike forces to the bits via the energy of a working fluid
Implementation Method 2
a rotary body that comprises a plurality of communication holes, which brings the fluid storage part and distribution ports into communication in order to feed the working fluid from the fluid storage part to the distribution ports of the working fluid distribution paths; wherein, the distribution ports are provided in the rotational direction of the rotary body such that the bits are impact driven staggered in time
Data Source
AI summary
An excavator for underground excavating arranged to perform excavating work with low vibration and low noise. A rotary excavator and an underground excavating method are also provided. The excavator (1) for underground excavating comprises a plurality of bits (42a, . . . ) having the outside diameter smaller than that of the excavator body (2) and advancing/retracting to/from the excavating side, piston case members (22b, . . . ) incorporating pistons (61) for applying a hitting force to respective bits (42a, . . . ) by the energy of working fluid, a section (30) for storing the working fluid being fed to respective piston case members (22b, . . . ), working fluid circulation passages (352) for allowing the working fluid being fed to respective piston case members (22b, . . . ) to pass, and a body of rotation (40) provided with a plurality of holes (4a, . . . ) for allowing the fluid storage section (30) to communicate with the circulation openings (3a, . . . ) of each working fluid circulation passage (352) in order to feed the working fluid from the fluid storage section (30) to the circulation openings (3a, . . . ) of the respective working fluid circulation passages (352).