Tying Machine Torque Control for Accurate Completion
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Solution Overview
Problem
Existing tying machines may incorrectly determine that the twisting of a tying string is complete due to changes in twisting torque value caused by the string being displaced on the surface of an object, leading to premature stoppage of the twisting motor.
Innovation Solution
The tying machine uses elapsed time or a predetermined number of rotations since a rise in twisting torque value is detected to determine completion, and employs a rate limiter value to accurately detect changes in torque, preventing incorrect determination of twisting completion even when the string is displaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the twisting motor is stopped when the twisting torque value changes from increase to decrease, then the twisting process can be automatically controlled, but the twisting motor may stop prematurely when the tying string is displaced on the object surface
Solution Approach 1:
The control unit continuously monitors the twisting torque value and uses feedback control to determine when to stop the twisting motor. By comparing the current torque value with previous values and detecting the specific pattern of torque increase followed by decrease, the system accurately identifies twisting completion while filtering out false signals caused by string displacement.
Solution Approach 2:
The system dynamically adjusts its detection criteria based on the real-time torque value changes. Instead of using a fixed threshold, the control unit adapts its judgment by analyzing the dynamic behavior of the torque value over time, specifically looking for the characteristic pattern of increase followed by decrease that indicates true twisting completion.
2Reliability
If the twisting motor continues to run until definite twisting completion is confirmed, then accurate twisting completion can be ensured, but the twisting process may be unnecessarily extended
Solution Approach 1:
The control unit uses continuous feedback from the torque sensor to determine when to stop the twisting motor. By monitoring the torque value changes and detecting the specific pattern of increase followed by decrease, the system can confidently identify twisting completion at the appropriate moment, avoiding both premature stoppage and unnecessary extension of the twisting process.
3Device complexity
If the twisting completion is determined solely by torque value change, then the detection is simple, but false determination occurs when the tying string is displaced
Solution Approach 1:
The control unit analyzes the dynamic behavior of the torque value over time rather than relying on a single static measurement. By detecting the specific temporal pattern of torque increase followed by decrease, the system achieves accurate completion detection while maintaining relative simplicity, effectively filtering out false signals from string displacement.
Solution Approach 2:
The control unit prepares and maintains a history of previous torque values before determining completion. This preliminary accumulation of data allows the system to compare current torque changes against historical patterns, enabling accurate detection of true twisting completion while rejecting false signals caused by string displacement.
Data Source
AI summary
A tying machine may include a twisting mechanism configured to twist a tying string. The twisting mechanism may include a twisting motor. The tying machine may be configured to obtain torque acting on the twisting motor as a twisting torque value, and stop the twisting motor when a predetermined tying completion condition is satisfied. The tying completion condition may include that an elapsed time since a rise in the twisting torque value was detected reaches a first predetermined time.