Lockable Suction Tube Assembly for Precise Drilling Depth
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Solution Overview
Problem
Conventional dust collecting devices for hand-held drilling tools struggle with controlling the depth of short-stroke drilling when using long drill bits, as the inner cylinder can freely move relative to the outer cylinder, making precise depth control difficult.
Innovation Solution
A dust collecting device with a suction tube assembly featuring an outer and inner tube, where a locking assembly allows the inner tube to be locked in fully extended, partially retracted, or freely movable states relative to the outer tube, and includes a locking mechanism with scales to indicate and control the moving distance, enabling precise depth adjustment for different drill bit lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inner tube is allowed to move freely relative to the outer tube for adaptability, then the device can accommodate different drill bit sizes, but the depth control precision deteriorates during short-stroke drilling with long drill bits
Solution Approach 1:
The locking assembly enables dynamic switching between two operational states: locked state for precise depth control during short-stroke drilling, and unlocked state for adaptability during long-stroke drilling. This dynamic adjustment resolves the contradiction by allowing the system to optimize for either precision or versatility depending on the drilling requirements.
Solution Approach 2:
The system changes the positional parameter of the inner tube relative to the outer tube through the locking mechanism. By adjusting the locked position of the inner tube, the effective length and positioning of the suction tube assembly are modified, enabling precise depth control for different drill bit configurations.
2Manufacturing precision
If the inner tube is locked in fixed positions, then depth control precision improves, but the device complexity increases due to additional locking mechanisms
Solution Approach 1:
The locking assembly acts as an intermediary mechanism between the inner tube and outer tube, providing a simple yet effective means to achieve precise positioning. Rather than complex multi-stage locking systems, this intermediary mechanism uses a straightforward lockable connection to enable depth control without excessive complexity.
3Adaptability or versatility
If the suction tube assembly is made extendable for long-stroke drilling, then the device versatility improves, but the control over moving distance deteriorates
Solution Approach 1:
The locking assembly enables preliminary positioning of the inner tube before drilling operations begin. By pre-locking the inner tube at the desired position relative to the outer tube, the system establishes precise moving distance control in advance, eliminating the measurement precision problems that would occur during actual drilling operations.
Data Source
AI summary
Disclosed are a dust collecting device and a drilling tool assembly, and the dust collecting device includes a main housing, a dust collecting box and a suction tube assembly mounted on the main housing, where the suction tube assembly includes an outer tube movably disposed on the main housing and an inner tube axially movably disposed in the outer tube, a suction port is provided at a front end of the inner tube, and a dust guide passage communicating with the suction port to the dust collecting box is formed in the suction tube assembly; where the suction tube assembly further comprises a locking assembly.