Variable Torque Vibrator Phase Shifter Stress Diversion
Solution Overview
Problem
Existing variable-moment vibrators used for driving objects like piles into the ground face issues with mechanical wear, high maintenance costs, and structural fragility due to the transmission of stresses to the phase shifter, which is not optimized for maintenance and experiences significant wear.
Innovation Solution
A variable-moment vibrator design featuring remotely controllable coaxial drive shafts with connecting means that allow for synchronous rotation and a controllable phase shift, incorporating a tubular transmission part to divert stresses away from the phase shifter, and a hydraulic or electric actuator for controlling vibratory power, optimizing maintenance access and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional phase shifter with hydraulic sealing and moving parts is used, then the vibrator can achieve variable moment control, but the mechanical parts undergo significant wear and require frequent maintenance
Solution Approach 1:
The patent replaces the traditional hydraulic phase shifter with a mechanical system using a conical friction element that can be axially displaced to vary the phase shift. This substitution eliminates hydraulic sealing and complex moving parts, significantly reducing mechanical wear and maintenance requirements while preserving variable moment control capability
Solution Approach 2:
The invention extracts the phase control function from the hydraulic system and implements it through a separate mechanical conical friction element system. This separation allows the hydraulic system to be simplified while the mechanical element handles phase adjustment, reducing overall system complexity and maintenance needs
2Device complexity
If the phase shifter is integrated into the vibrator structure, then the device achieves compact design, but the accessibility to the phase shifter and moving parts is reduced making maintenance difficult
Solution Approach 1:
The patent segments the phase control mechanism into a distinct conical friction element assembly that can be independently accessed and maintained. This segmentation allows the phase shifter components to be serviced separately from the main vibrator structure, improving accessibility while maintaining structural integration benefits
3Measurement precision
If the phase shifter uses hydraulic sealing and moving parts, then the vibrator achieves precise phase control, but the stresses from drive pinions are transmitted to the phase shifter causing structural fragility
Solution Approach 1:
The conical friction element acts as an intermediary between the drive pinions and the phase control mechanism. It receives and dissipates stresses through friction contact, preventing stress transmission to the phase shifter structure while maintaining precise phase control capability through axial displacement
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 design reduces wear and maintenance needs by diverting stresses and optimizing the phase shifter's structural integrity, enhancing the reliability and efficiency of the vibratory process while minimizing operational costs.
Implementation Method 1
a pressurized fluid intake circuit allowing the axial displacement of the aforesaid piston under the effect of this fluid in two working chambers
Implementation Method 2
a third threaded part having helical ramps sliding in the helical ramps of the aforesaid first threaded part
Implementation Method 3
the centrifugal forces generated by the rotation of the flyweights add up in a direction defining a work axis and compensate for each other in the other directions to cancel each other out in a direction perpendicular to the work axis
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The variable-moment vibrator according to the invention uses a phase shifter (7) comprising at least two trains of weights, each having at least two eccentric weights driven in rotation by two gears that mesh with each other so as to rotate in opposite directions relative to each other. The two trains of weights are coupled to each other by a remotely controllable phase shifter (7) comprising a first tubular drive shaft (9) fixed in rotation at one of its ends to a first gear (P4) and a second central drive shaft (6) which engages in the first tubular drive shaft (9) and which is fixed in rotation to a second gear (P3) located opposite the first gear (P4). A tubular transmission part (8), rotationally fixed to the first tubular drive shaft (9), ensures a diversion of the stresses exerted at the level of the gears (P3, P4) thus relieving the phase shifter.