Elastically Deformable Piston Vibration Hammer for Hard Ground Boring
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Solution Overview
Problem
Conventional boring machines face challenges in efficiently boring through hard ground conditions, such as rocks, due to the risk of piston damage from lateral pressure and increased frictional heat leading to gear fixation, which complicates the drilling process and reduces durability.
Innovation Solution
A vibration hammer design featuring an elastically deformable piston with a hydraulic pressure controlling valve, a rotating unit with a friction dampening mechanism using spline units and rolling balls to minimize frictional heat and prevent piston damage, and a main gear dampening system to reduce frictional forces between the hammer guide and main gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional piston structure is used in the vibration hammer, then the结构简单性 (structural simplicity) is maintained, but the piston is damaged by elastic deformation under lateral pressure during deep-hole boring
Solution Approach 1:
The piston structure is transformed from a rigid fixed structure to a dynamic flexible structure. The piston includes a flexible section with smaller diameter that can elastically deform under lateral pressure, allowing the piston to adapt to side forces during deep-hole boring while maintaining connection between the upper and lower portions. This dynamic flexibility prevents damage from excessive stress accumulation.
Solution Approach 2:
The piston structure incorporates a flexible section with changed geometric parameters (smaller diameter) compared to the upper and lower portions. This parameter change creates a region with different mechanical properties that can elastically deform to absorb lateral pressure, preventing piston damage while maintaining overall structural integrity.
2Reliability
If a conventional gear connection is used between the main gear and hammer guide, then the manufacturing simplicity is maintained, but frictional heat causes the gear members to fixate during operation
Solution Approach 1:
A damping member is introduced as an intermediary element between the main gear and the hammer guide. This damping member absorbs frictional heat generated during gear engagement, preventing the fixation problem. The damping member acts as a thermal buffer that protects the gear connection from overheating while maintaining the mechanical connection.
Solution Approach 2:
The damping member is pre-installed in the gear connection to provide beforehand cushioning against frictional heat. This preventive measure ensures that when friction occurs during operation, the heat is already absorbed and dissipated, preventing the gear members from fixingating due to thermal expansion or material degradation.
3Force
If high hydraulic pressure is applied to the piston for deep-hole boring, then the striking force is improved, but the piston is more susceptible to damage from lateral pressure and elastic deformation
Solution Approach 1:
The flexible piston structure allows the system to maintain high hydraulic pressure for strong striking force while the flexible section dynamically absorbs lateral pressure through elastic deformation. This prevents the piston from failing under combined high axial and lateral loads during deep-hole boring operations.
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 vibration hammer effectively prevents piston damage from lateral pressure, enhances durability, and reduces frictional heat-induced gear fixation, ensuring sustainable striking and rotating forces during deep-hole boring operations.
Implementation Method 1
a piston (28) having both ends fixed to hollow portions of the piston housing (25) and the hammer guide (26) and elastically deformable at a predetermined angle with an elevating direction of the piston housing (25)
Implementation Method 2
a hydraulic pressure controlling valve unit (210) installed in the main body (11), and a piston housing (25) installed to be elevated by a hydraulic pressure
Implementation Method 3
a friction dampening means installed in the dampening means-coupled portion of coupling the main gear and the hammer guide and preventing the main gear and the hammer guide from being fixed to each other due to a frictional heat
Implementation Method 4
rolling balls installed in a ball guide portion between splines provided at both sides coupled to the spline units
Data Source
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AI summary
A vibration hammer is provided, including a main body; a striking unit having a piston housing installed to be elevated by a hydraulic pressure controlling valve unit installed in the main body, a hammer guide slidably installed on the main body to be coaxial with the piston housing, and a piston having both ends fixed to the piston housing and a hammer guide and elastically deformable at a predetermined angle with an elevating direction of the piston housing; and a rotating unit installed in the main body and reciprocally rotating the hammer guide elevated together with the piston. The vibration hammer can prevent the piston from being damaged by being elastically deformed when a lateral pressure applied to the rod connected to the piston.