Segmented Control Sleeve With Movable Connection For Percussion Boring
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Solution Overview
Problem
Percussion boring devices experience reduced performance and shortened service life due to warping of the control sleeve under kinetic stress, leading to increased maintenance costs and potential mechanical failure from friction and angular offsets between the control sleeve and impact piston.
Innovation Solution
The control sleeve is designed with two sections connected by a movable resilient connection or articulation, allowing for axial shiftability and swiveling, which prevents deformation and reduces friction, enabling longer service life and improved performance by maintaining the structural integrity of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control sleeve is made long to enable axial shiftability of the impact piston, then the impact piston can act on the control sleeve during movement, but the control sleeve warps due to kinetic energy transmission, reducing service life and increasing maintenance costs
Solution Approach 1:
The control sleeve is divided into two separate sections (first control sleeve section and second control sleeve section) connected by a movable connection. This segmentation allows each section to be shorter individually, preventing warping while maintaining the overall length needed for axial shiftability. The first section guides the impact piston, while the second section provides additional stroke length.
Solution Approach 2:
The movable connection between the two control sleeve sections is designed to be dynamic rather than rigid. It includes a resilient connecting section that can deform elastically and an articulation that allows relative movement, enabling the connection to absorb kinetic energy shocks and prevent warping of the control sleeve sections while still providing the necessary axial shiftability.
2Productivity
If the control sleeve is made long to increase the stroke of the impact piston, then the performance of the percussion boring device is improved, but friction increases strongly, reducing device performance
Solution Approach 1:
By segmenting the control sleeve into two sections with a movable connection, the patent reduces the contact length between the control sleeve and guide tube compared to a single long control sleeve. This reduces friction while maintaining the overall stroke length needed for high productivity.
Solution Approach 2:
The movable connection with resilient connecting section and articulation introduces dynamic movement that reduces friction. The resilient section can deform to reduce contact pressure, and the articulation allows angular movement that prevents binding, thereby reducing energy loss to friction while maintaining stroke length.
3Stability of the object's composition
If the housing is bent by lateral forces in the ground, then angular offset between control sleeve and impact piston occurs, causing the device to reach standstill
Solution Approach 1:
The movable connection with articulation provides angular degrees of freedom that allow the control sleeve sections to adjust their orientation relative to each other. This dynamic adjustment compensates for housing bending and lateral forces, maintaining alignment between the impact piston and control sleeve to prevent standstill and ensure continuous operation.
4Stability of the object's composition
If a rigid connection is used between control sleeve sections, then structural stability is maintained, but the control sleeve cannot accommodate kinetic energy shocks and warps
Solution Approach 1:
The movable connection transforms the rigid structure into a dynamic system that can absorb kinetic energy shocks through elastic deformation of the resilient connecting section and angular movement of the articulation. This maintains structural stability while preventing warping by allowing controlled movement rather than forcing rigid alignment under shock loads.
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 solution enhances the performance and lifespan of percussion boring devices by reducing friction and preventing mechanical failure, ensuring consistent operation and reduced maintenance costs through the use of a movable connection between the control sleeve sections.
Implementation Method 1
The movable connection can be configured as a resilient connecting section
Implementation Method 2
The movable connection can form a friction bearing for one of the two sections
Data Source
AI summary
A percussion boring device with an impact piston is mounted within a housing and driven in a cyclic back and forth movement. In a first switch position, the impact piston strikes a front impact surface, in order to drive the percussion boring device in a first movement direction, and, in a second switch position, the impact piston strikes a rear impact surface, in order to drive the percussion boring device in a second movement direction. For the reversal of the movement directions, a guide tube fixed to the housing, and a control sleeve which can be axially shifted on the guide tube, are provided, and the impact piston can be axially shifted on the control sleeve. The control sleeve includes two sections which are connected to one another by a movable connection.