Torque-Limiting Mechanism for Hand-Held Cleaning Device Rollers
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Solution Overview
Problem
Existing cleaning devices for pipelines with spring shafts face overloading and deformation due to incorrect adjustment of radial forces and exceeding dimensional tolerances, leading to system failure.
Innovation Solution
A torque-limiting device is integrated between the adjustment knob and the bearing block to restrict radial forces to predetermined maximum values, using a friction body with disk springs and a support ring to prevent accidental separation and ensure secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the adjustment knob is directly connected to the bearing block for adjusting radial contact pressure, then the adjustment mechanism is simple, but overloading and deformation can occur when the adjustment knob is operated incorrectly or with excessive force
Solution Approach 1:
A torque-limiting device is introduced as an intermediary between the adjustment knob and the bearing block. This device includes a friction body with disk springs that limits the maximum torque transmitted to the bearing block, preventing overloading of the roller system while maintaining the simplicity of the adjustment mechanism.
Solution Approach 2:
The friction body with disk springs provides beforehand cushioning by pre-setting a maximum torque limit. When excessive force is applied to the adjustment knob, the friction body slips or compresses the disk springs, preventing the transmission of damaging forces to the bearing block and roller system before overload can occur.
2Ease of operation
If the adjustment knob allows free rotation for precise angular positioning, then the angular position can be accurately adjusted, but accidental over-rotation and overloading can occur
Solution Approach 1:
The torque-limiting device acts as a mediator that allows free rotation for precise angular positioning while simultaneously limiting the maximum torque that can be transmitted. The friction body enables smooth rotation adjustment but slips or compresses when excessive force is applied, protecting the roller system from overloading.
Solution Approach 2:
The friction body changes the torque parameter dynamically - allowing full torque transmission during normal adjustment operations for precise positioning, but automatically reducing the torque parameter to a safe maximum level when excessive force is applied, thus protecting the roller system strength.
3Manufacturing precision
If the radial stroke of the roller arrangement is limited by a pin abutting a leaf spring, then the setting is constrained, but the leaf spring can break under high manual setting force
Solution Approach 1:
The friction body with disk springs serves as an intermediary torque-limiting device between the adjustment knob and the bearing block. This prevents excessive torque from being transmitted to the leaf spring, protecting it from breaking while still allowing precise angular positioning of the roller arrangement.
Solution Approach 2:
The torque-limiting device provides beforehand cushioning by pre-establishing a maximum torque limit that prevents the leaf spring from experiencing breaking forces. The friction body slips or compresses disk springs before the leaf spring can be overloaded, protecting the entire roller positioning system.
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 solution prevents overloading and deformation, ensuring reliable operation by limiting torque and maintaining dimensional integrity, allowing for effective and safe adjustment of the cleaning device.
Implementation Method 1
a friction body (27) bears on a support ring (26), which is rotatably supported on an shaft (19) in a cavity (11a) enclosed by the adjustment knob (11)
Implementation Method 2
the elastic element consists of at least two disk springs (27a) which touch when spread
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The device (1) has a motor (2), and a drum (5) for receiving and outputting of spring shaft (6). A chamber (10) in which multiple rollers with axes are arranged, where the rollers act radially on the shaft. The axes are arranged with radial distance from axis of the shaft. One of the rollers is supported in a bearing support whose radial distance is changeable from the axis of the shaft by an adjustment knob (11). A rotational torque limiting device is arranged between the knob and the support, where radial forces of the roller are limited to a maximum value by the limiting device.