Self-Drilling Anchor Bolt Setting with Locking-Coupled Expansion
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Solution Overview
Problem
Existing self-drilling anchor bolt setting devices require mode switching during the drilling and expansion stages, leading to poor fastening results due to continuous rotation of the anchor rod, which affects the contact between the expanding sleeve and the hole wall.
Innovation Solution
A setting device with a releasable locking component that allows sequential drilling and expansion without mode switching, using a drive shaft and coupling to transmit rotational and striking motions separately, ensuring the sleeve expands radially to form a close friction fit with the hole wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the anchor rod continuously rotates during the expansion stage, then the drilling function is maintained, but the contact between the expanding sleeve and hole wall deteriorates, resulting in poor fastening
Solution Approach 1:
The patent segments the drive shaft into two independent functional parts: an inner drive shaft that rotates with the anchor rod during drilling, and an outer drive shaft that strikes the expanding sleeve during expansion. This segmentation allows the rotation and striking functions to be separated, enabling the anchor rod to stop rotating while the sleeve continues to be driven axially for expansion, thus resolving the contradiction between continuous operation and fastening quality.
Solution Approach 2:
The patent introduces a locking component as an intermediary mechanism that couples or decouples the inner and outer drive shafts. This locking component acts as a mediator that controls the transmission of rotational motion from the inner drive shaft to the anchor rod, and controls the transmission of striking motion from the outer drive shaft to the expanding sleeve, enabling seamless transition between drilling and expansion stages without mode switching.
2Ease of operation
If mode switching is required between drilling and expansion stages, then functional control is achieved, but device complexity and operational complexity increase
Solution Approach 1:
The patent merges the drilling and expansion functions into a single continuous operational sequence by combining the inner and outer drive shafts into one integrated setting device. The locking component enables automatic transition between functions without requiring external mode switching, merging the control of both stages into a unified mechanical system that reduces operational complexity while maintaining functional control.
Solution Approach 2:
The patent employs dynamic coupling and decoupling mechanisms where the locking component can transition between locked and unlocked states. During drilling, the locking component couples the inner and outer drive shafts; during expansion, it decouples them. This dynamic adaptability allows the device to automatically adjust its functional state based on the operational stage, eliminating the need for manual mode switching and reducing operational complexity.
3Stability of the object's composition
If the anchor rod rotates during expansion, then rotational motion is maintained, but the friction fit between sleeve and hole wall is compromised
Solution Approach 1:
The patent segments the motion transmission path so that rotational motion is isolated to the inner drive shaft and anchor rod during drilling, while the outer drive shaft independently transmits only axial striking motion to the expanding sleeve. This segmentation ensures that during expansion, the anchor rod remains stationary (no rotation) while the sleeve is driven axially to form a friction fit with the hole wall, thereby maximizing fastening strength without compromising the stability of the drilling function in the previous stage.
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
Enables efficient and reliable self-drilling and expansion of the anchor bolt in a single continuous process, improving the load value and operability while reducing costs and structural complexity.
Implementation Method 1
a setting device for setting a self-drilling anchor bolt in a receiving material using an impact tool
Implementation Method 2
a surface of the sleeve forms a friction fit with an inner surface of the drilled hole, thereby fixing the anchor bolt in the drilled hole by friction
Data Source
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AI summary
A setting device for a self-drilling anchor bolt of the present invention comprises: a drive shaft, one end thereof having a shank for connecting to an impact tool, and another end being a setting part for pushing the self-drilling anchor bolt axially; a coupling, partially surrounding the drive shaft along an axis, and being supported on the drive shaft in such a way as to be incapable of relative rotation while being axially moveable at least locally; and a releasable locking component, disposed between the drive shaft and the coupling; in a locked position, the locking component is coupled to an extremity of an anchor rod such that the anchor rod is fed axially with rotational striking into a receiving material, and in a released position, the drive shaft strikes a sleeve to advance axially along the anchor rod and expand at an expansion part. The setting device and setting method for a self-drilling anchor bolt of the present invention can complete two stages consecutively, specifically self-drilling anchor bolt drilling and expansion, at a very low cost and with very good operability and high reliability.