Wall Crack Repair Device with Adsorption and Multi-Point Contact
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Solution Overview
Problem
Conventional devices for repairing cracks in concrete or mortar walls face issues with the contact balance between the injection nozzle and contact member, leading to potential tilting and separation from the crack, resulting in filler leakage and incomplete filling.
Innovation Solution
The device is designed with an arm supported at multiple points, including the injection nozzle and multiple contact members arranged orthogonally, which stabilizes the arm and prevents tilting, ensuring reliable filler injection by maintaining contact with the wall surface even with irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the arm is supported at two points (injection nozzle and single contact member), then the structure is simple, but the contact balance deteriorates causing arm tilting and nozzle separation from crack
Solution Approach 1:
The single contact member is segmented into multiple contact members (first contact member and second contact member) arranged in the width direction of the arm. This segmentation distributes the support points along the arm, improving contact balance and preventing arm tilting while maintaining structural simplicity.
2Stability of the object's composition
If the contact member is fixed rigidly, then the position is stable, but it cannot follow wall surface irregularities causing poor contact
Solution Approach 1:
The contact member is designed with movable characteristics allowing it to adjust its position dynamically. The contact member can move in the vertical direction to follow wall surface irregularities while maintaining stable contact, achieving both position stability and adaptability to varying wall conditions.
3Productivity
If filler is injected at high pressure, then filling efficiency is improved, but reaction force causes arm rotation and nozzle uplift from crack
Solution Approach 1:
Multiple contact members are positioned to create counterbalancing forces against the reaction force generated during high-pressure filler injection. The distributed contact members along the arm's width provide opposing moments that prevent arm rotation and keep the nozzle pressed against the crack, enabling high-pressure injection without nozzle uplift.
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
This configuration ensures reliable filling of cracks by preventing the injection nozzle from being uplifted or separated, improving the consistency and reliability of the filler injection process.
Implementation Method 1
an adsorption disk that is fixed to a supporting shaft in which a suction passage for sucking air is formed and is adsorbed to the wall surface Wa by suction of air through the suction passage 103 of the supporting shaft 104
Implementation Method 2
the contact member 110 is provided at the rear end part of the arm 108 such that the contact member 110 can move up and down, and is always urged downwardly by a coil spring 111. the contact member 110 elastically contacts the wall surface Wa and satisfactorily follows the irregularities of the wall surface Wa
Data Source
AI summary
A device for repairing a crack in a wall includes an injection nozzle that has a nozzle part, and an adsorption disk fixed to a supporting shaft in which a suction passage for sucking air is formed and can be adsorbed to a wall surface by sucking air through the suction passage, and can be detached from the wall surface by releasing the suction, an arm having a front end part and a rear end part in the axial direction, and is supported by the supporting shaft in the midpoint of the axial direction through the first universal joint and supports an inflow pipe of the injection nozzle in the front end part through a second universal joint, and a plurality of contact members attached to the rear end part of the arm, the front end thereof contacting the wall surface, and receives the moment load generated in the arm.