Blind Rivet Nut-Setting Tool With Distance and Torque Control
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Solution Overview
Problem
Existing blind rivet nut-setting tools lack precise control over the setting process, particularly in terms of distance and force, leading to inconsistent and potentially damaging operations.
Innovation Solution
A blind rivet nut-setting tool equipped with a motor, position sensor, and controller that adjusts the operating mode based on distance or force thresholds, along with a clutch mechanism that disengages when excessive torque is detected, ensuring controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing blind rivet nut-setting tools are used without precise control mechanisms, then the operation is simpler and the device is less complex, but the manufacturing precision and consistency of the setting process deteriorates
Solution Approach 1:
The patent implements feedback control by using sensors to detect the actual setting distance and force, then comparing these values against predetermined thresholds. The controller adjusts motor operation based on this feedback to maintain precise control over the setting process, ensuring consistent results while managing device complexity through electronic control systems.
Solution Approach 2:
The patent replaces traditional mechanical control mechanisms with an electronic control system comprising a motor, position sensor, force sensor, and controller. This substitution allows for more precise and programmable control of the setting process, enabling accurate distance and force management without complex mechanical linkages.
2Manufacturing precision
If the output shaft actsuates without distance control, then the operation is faster and simpler, but the manufacturing precision and consistency of the setting process deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-setting the desired actuation distance through the distance-setting device before the actual setting operation. The controller uses this predetermined distance value to control motor actuation, ensuring consistent setting results. The system prepares control parameters in advance to maintain precision while enabling rapid execution of the setting process.
3Reliability
If the motor operates without torque threshold protection, then the productivity is higher and operation is continuous, but the reliability and risk of damage increases
Solution Approach 1:
The patent implements preliminary anti-action by establishing a torque threshold before operation begins. The controller continuously monitors motor current as an indicator of torque, and automatically stops motor operation when the current exceeds the predetermined threshold. This preventive measure protects against damage while maintaining productivity by allowing continuous operation within safe parameters.
Data Source
AI summary
A blind rivet nut-setting tool includes an output shaft, an input device for adjusting an operating mode, a distance-setting device, a motor coupled to the output shaft, a position sensor for detecting a position of the motor, and a controller. The distance-setting device, the motor, the position sensor, and the controller are configured to receive, from the input device, an input indicative of the operating mode, determine the tool is in a distance-based operating mode, determine a value of the distance-setting device, determine a pulling distance based on the value of the distance-setting device, operate the motor to actuate the output shaft, compare the number of rotations of the motor to a rotation threshold that corresponds to the distance to pull the rivet nut, and stop, in response to the number of rotations of the motor being greater than or equal to the rotation threshold.