Adjustable Pulley Belt-Disc Sander for Variable Abrasive Belt Speed
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Solution Overview
Problem
Existing belt-disc sanders lack the ability to adjust the speed of the abrasive belt effectively, limiting their versatility in processing different materials.
Innovation Solution
A speed-adjustable belt-disc sander is designed with a first and second pitch adjustable pulley system connected by a v-belt, featuring a speed adjusting device to control the effective belt diameter of the second pulley, allowing for precise speed control of the belt sander assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed pulley system is used in belt-disc sander, then the structure is simple, but the speed of the abrasive belt cannot be adjusted
Solution Approach 1:
The patent applies the dynamics principle by making the pulleys adjustable rather than fixed. The first and second pulleys can change their effective diameters independently through adjustment mechanisms, allowing the belt speed to be varied dynamically. This transforms a static pulley system into a dynamic one where the geometry can be modified during operation to achieve different speed ratios.
Solution Approach 2:
The patent implements parameter changes by allowing the effective diameters of the pulleys to be varied. By changing the diameter parameters of the pulleys (D1, D2, D3, D4), the belt speed can be adjusted according to the formula v = π*D*n. The adjustment mechanisms enable continuous or discrete changes in pulley diameters, providing speed control without changing the motor speed.
2Ease of operation
If pitch adjustable pulleys are used to enable speed adjustment, then the speed control capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the speed control function across multiple independent adjustable pulleys (first and second pulleys) rather than using a single complex adjustment mechanism. Each pulley can be adjusted independently, allowing for fine-tuned speed control through the combined effect of multiple adjustment points in the belt drive system.
Solution Approach 2:
The adjustable pulleys serve multiple functions: they control belt speed, maintain proper belt tension through the adjustment mechanisms, and provide a means to adapt the drive ratio for different operating conditions. The same pulley structure that enables speed adjustment also serves as a tensioning mechanism, reducing the need for separate components.
3Adaptability or versatility
If multiple pitch adjustable pulleys connected by v-belt are used, then the speed adjustment range is expanded, but the structural complexity increases
Solution Approach 1:
The patent merges multiple pulleys and belts into a coordinated system where the first and second pulleys work together with connecting belts to achieve compound speed adjustment. By combining the adjustment effects of multiple pulleys, the system achieves a broader speed range than a single adjustable pulley could provide, while the merged structure shares common support and alignment features.
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 flexible speed adjustment of the abrasive belt, enhancing the sander's capability to handle various materials by optimizing the sanding process.
Implementation Method 1
The speed-adjustable belt-disc sander may include a rod rotationally coupled with the speed adjusting device, the rod including external threads engaged with the internal threads of the shaft. When the rod is rotated by the speed adjusting device, the shaft is prevented from rotation around a rotational axis of the second pitch adjustable pulley and allowed to move along the rotational axis to move the flange.
Implementation Method 2
The spring can be designed to squeeze the v-belt between the first flange and the second flange and to push the first flange into the second flange, thereby adjusting a further effective belt diameter of the first pitch adjustable pulley in response to adjusting the effective belt diameter of the second pitch adjustable pulley.
Data Source
AI summary
A speed-adjustable belt-disc sander is provided. The speed-adjustable belt-disc sander includes an electric motor, a first pitch adjustable pulley driven by the electric motor, a second pitch adjustable pulley driven by the first pitch adjustable pulley, a v-belt connecting the first pitch adjustable pulley and the second pitch adjustable pulley, a first pulley driven by the second pitch adjustable pulley, a second pulley driven by the first pulley, a belt sander assembly driven by the second pulley, and a speed adjusting device designed to control an effective belt diameter of the second pitch adjustable pulley, thereby controlling the speed of the belt sander assembly.