Hydraulic Hammer Piston Magnetic Guide System
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Solution Overview
Problem
Hydraulic hammers experience premature failure due to galling and wear between the piston and cylinder, particularly when used in horizontal positions, where radial motion and contamination from abrasive materials like stone dust exacerbate the issue, leading to costly repairs.
Innovation Solution
A magnetic guide system is integrated into the hydraulic hammer, comprising magnetic guide components that produce repellent forces to maintain the piston's radial position near the centerline, utilizing electrodynamic, magnetic suspension, or diamagnetic systems to reduce unintended motion and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If seals and bushings are used to prevent contamination, then protection from harmful contaminants is improved, but galling and wear between piston and cylinder still occur due to radial motion
Solution Approach 1:
The patent replaces the mechanical contact-based sealing system with a magnetic field-based guidance system. Magnetic guide components create a magnetic field that exerts radial forces on the piston, replacing mechanical bushings and seals that physically contacted the piston. This substitution eliminates the galling and wear associated with mechanical contact while maintaining contamination protection.
Solution Approach 2:
The magnetic field acts as an intermediary between the magnetic guide components and the piston. Instead of direct mechanical contact between piston and cylinder walls, the magnetic field mediates the interaction, providing radial guidance forces that prevent galling while allowing the piston to move freely within the cylinder.
2Ease of operation
If the piston is allowed to move freely in the cylinder, then operational flexibility is improved, but radial motion causes galling and premature failure
Solution Approach 1:
The patent replaces mechanical constraint systems (bushings, seals, guide rails) with a magnetic field-based guidance system. The magnetic field provides subtle radial guidance forces that correct deviations without restricting axial movement, allowing free piston operation while preventing galling through non-contact forces.
Solution Approach 2:
The patent changes the physical state of the guidance system from solid mechanical contacts to a magnetic field. This parameter change allows the piston to move freely axially while the magnetic field provides continuous radial position correction, eliminating galling caused by mechanical friction and contact.
3Reliability
If magnetic guide components are added to reduce radial motion, then galling and wear are reduced, but device complexity increases
Solution Approach 1:
The magnetic guide system is segmented into discrete magnetic guide components positioned at specific locations within the cylinder. Each component creates a localized magnetic field that contributes to the overall radial guidance. This segmentation allows the complex function of radial guidance to be achieved through multiple simple, identical elements rather than one complex mechanism.
Solution Approach 2:
The magnetic guide components serve multiple functions: they provide radial guidance forces to prevent galling, maintain contamination protection without mechanical contact, and allow free axial piston movement. This multi-functionality reduces the need for separate mechanical guidance, sealing, and protection systems, offsetting the added complexity with functional consolidation.
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 magnetic guide system effectively reduces galling and wear by maintaining precise alignment and minimizing radial motion, thereby extending the lifespan of hydraulic hammer components and reducing maintenance costs.
Implementation Method 1
A magnetic guide system includes at least one of a first magnetic guide component disposed in the piston and at least one of a second magnetic guide component disposed in the sleeve that interact to produce magnetic repellent forces therebetween to urge the radial position of the piston towards the center line
Data Source
AI summary
A hydraulic hammer includes a power cell. A work tool is partially received in, and movable with respect to, the power cell. A sleeve is positioned in the power cell that defines a centerline. A piston is concentrically positioned in the sleeve and movable in the sleeve between a first position in contact with the work tool and a second position out of contact with the work tool. A magnetic guide system includes at least one of a first magnetic guide component disposed in the piston and at least one of a second magnetic guide component disposed in the sleeve that interact to produce magnetic repellent forces therebetween to urge the radial position of the piston towards the center line.