Rebar Tying Motor Reverse Rotation Voltage Drop Prevention
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Solution Overview
Problem
Reinforcing bar binding machines experience operational instability and frequent stops due to voltage drops during low-temperature environments, particularly during the twisting step, which can lead to incomplete binding and mechanical failure.
Innovation Solution
Incorporation of a power supply voltage detecting device that monitors voltage levels specifically during the twisting step and triggers a reverse motor rotation to return the binding wire twisting mechanism to the initial position before the CPU operation voltage is reached, preventing machine stoppages and ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the binding wire twisting mechanism operates under low temperature environment, then the binding operation can be performed, but the power supply voltage drops below CPU operation voltage causing machine stoppages
Solution Approach 1:
The control device detects voltage drop during the twisting step and rotates the motor in reverse direction to return the binding wire twisting mechanism to initial position before the voltage drops below CPU operation voltage, preventing machine stoppages
Solution Approach 2:
A power supply voltage detecting device monitors voltage levels during operation, and when voltage drops below a predetermined threshold during the twisting step, the control device activates reverse motor rotation to prevent CPU voltage dropout and ensure stable operation
2Strength
If the twisting load is increased to achieve high binding strength, then the binding strength is improved, but the voltage drop is more severe causing frequent stops under low temperature
Solution Approach 1:
The control device detects voltage drop during the twisting step and rotates the motor in reverse direction to return the binding wire twisting mechanism to initial position before the voltage drops below CPU operation voltage, preventing machine stoppages even under high twisting load
Solution Approach 2:
The power supply voltage detecting device continuously monitors voltage during high-load twisting operations, and when voltage approaches the critical threshold, the control device initiates reverse rotation to prevent CPU voltage dropout, ensuring stable operation even with increased twisting demand
Data Source
AI summary
A reinforcing bar binding machine is provided with a device for detecting a power supply voltage during a binding wire twisting step subjected to the heaviest load and comparing the power supply voltage with a predetermined CPU operation voltage, and a control device for driving a motor in a reverse direction when the voltage has dropped below the predetermined CPU operation voltage. The power supply voltage during operation is monitored, and twisting operation is suspended before the voltage drops below the CPU operation voltage, whereby the binding wire twisting mechanism is returned to the initial position. Therefore, it is possible to prevent the binding wire twisting mechanism from being stopped while grasping the binding wire, when the CPU stops.