Self-Drilling Anchor Bolt Setting with Releasable Rotational Lock
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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 with a coupling and locking mechanism to transmit rotational motion during drilling and axial striking motion during expansion, ensuring the sleeve forms a close friction fit with the hole wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the two drive shafts are rotationally coupled throughout the setting process, then the expanding sleeve can rotate during drilling and expansion, but the anchor rod continues to rotate after drilling, causing poor fastening results
Solution Approach 1:
The patent divides the drive shaft system into two independent parts: an inner drive shaft that rotates with the anchor rod during drilling, and an outer drive shaft that rotates the expanding sleeve during expansion. A locking mechanism couples these shafts only during the drilling phase, then decouples them during expansion. This segmentation allows rotational motion to be selectively applied to different components at different stages, resolving the contradiction between continuous rotation ease and fastening quality.
Solution Approach 2:
The patent implements a dynamic coupling system where the relationship between the inner and outer drive shafts changes based on the operation stage. During drilling, the locking mechanism engages to couple the shafts for simultaneous rotation. During expansion, the locking mechanism releases to decouple the shafts, allowing the outer shaft to rotate the sleeve while the inner shaft stops rotating the anchor rod. This dynamic adjustment resolves the contradiction by adapting the rotational coupling to the specific operational requirements of each stage.
2Reliability
If mode switching is required between drilling and expansion stages, then rotational motion can be stopped, but the operation becomes more complex and time-consuming
Solution Approach 1:
The patent merges the drilling and expansion operations into a single continuous setting process using one integrated anchor bolt component. The self-drilling anchor bolt combines the drill bit, anchor rod, and expanding sleeve into one unified structure that performs both drilling and expansion functions. This merging eliminates the need for separate tools or complex mode switching, as the single component naturally transitions from drilling to expansion mode through its own structural design, resolving the contradiction between fastening quality and device complexity.
Solution Approach 2:
The self-drilling anchor bolt is designed to automatically transition between drilling and expansion stages without external intervention. The drill bit drills the hole while rotating, then automatically transforms into an expansion mechanism that pushes the sleeve outward to expand and secure the anchor. This self-service capability eliminates the need for manual mode switching or complex control mechanisms, resolving the contradiction by making the system self-regulating while maintaining high fastening quality.
3Productivity
If the anchor rod rotates continuously during expansion, then the drilling function is maintained, but the contact between the expanding sleeve and hole wall is compromised
Solution Approach 1:
The patent segments the rotational function between two separate components: the inner drive shaft rotates the anchor rod and drill bit during drilling, while the outer drive shaft rotates the expanding sleeve during expansion. This segmentation ensures that rotation is applied only to the appropriate component at each stage, allowing high drilling efficiency when the inner shaft rotates, and precise sleeve-hole wall contact when the outer shaft rotates the sleeve without anchor rod rotation, thus resolving the contradiction.
Solution Approach 2:
The patent uses a dynamic locking mechanism that couples the inner and outer drive shafts during drilling to maintain rotational efficiency, then decouples them during expansion to eliminate anchor rod rotation. This dynamic control allows the system to optimize for drilling efficiency when rotation is needed, and for expansion precision when rotation should be stopped, resolving the contradiction between productivity and manufacturing precision through stage-dependent rotational control.
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 setting of self-drilling anchor bolts with improved load values and operability by maintaining axial motion of the sleeve during expansion, preventing rotational interference and enhancing contact with the hole wall.
Implementation Method 1
the anchor rod is fed axially with rotational striking into a receiving material
Implementation Method 2
the sleeve expands radially at the expansion part, forming a close friction fit with a hole wall
Implementation Method 3
the sleeve expands radially at the expansion part, forming a close friction fit with a hole wall
Implementation Method 4
the locking component is coupled to an extremity of the anchor rod such that the anchor rod is fed axially with rotational striking
Implementation Method 5
the annular extremity of the setting part strikes the sleeve to advance axially along the anchor rod
Data Source
AI summary
A setting device for a self-drilling anchor bolt of the present invention includes: 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.