Liquid Dispenser Control for Constant Line Width at Variable Speed
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Solution Overview
Problem
Existing liquid material application techniques require laborious programming to maintain consistent discharge rates and line widths during relative movement between a dispenser and a workpiece, especially when changing speeds, and cannot perform spot applications effectively.
Innovation Solution
A liquid material application apparatus with a discharge control unit that switches between modes to adjust discharge amounts based on relative moving speed or maintain a constant discharge rate regardless of speed, allowing for line drawing, dumping, trial, and spot applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the relative moving speed between the dispenser and the worktable is changed in the corner portion, then the line width of the drawn application line becomes wider than in the linear portion, but this causes inconsistency in the applied liquid material width
Solution Approach 1:
The patent changes the discharge pressure parameter in response to changes in relative moving speed. Specifically, when the relative moving speed decreases in the corner portion, the discharge pressure is increased to compensate and maintain consistent line width. This parameter coupling ensures that the product of discharge pressure and moving speed remains constant, resolving the line width inconsistency problem.
2Manufacturing precision
If the discharge pressure is controlled in accordance with pattern data stored in a microcomputer, then the desired line drawing application can be achieved, but laborious programming is required for relative movement commands and discharge amount control
Solution Approach 1:
The system performs self-service by automatically calculating and adjusting the discharge pressure based on the actual relative moving speed without requiring external programming for discharge control. The control unit receives the relative moving speed signal and autonomously determines the appropriate discharge pressure to maintain constant line width, eliminating the need for complex discharge amount control programming.
Solution Approach 2:
The patent implements a feedback mechanism where the actual relative moving speed is continuously monitored and used to adjust the discharge pressure in real-time. The control unit receives feedback about the relative moving speed and automatically modifies the discharge pressure to compensate for speed variations, ensuring consistent line width without pre-programming discharge parameters.
3Quantity of substance
If the valve rod is opened to increase the discharge flow rate when the linear moving speed is high, then the liquid amount can be controlled to be constant, but this requires continuous movement of the dispenser and worktable at the corresponding relative moving speed
Solution Approach 1:
The patent changes the discharge pressure parameter dynamically based on the relative moving speed. When the relative moving speed is high, the discharge pressure is increased to maintain constant liquid amount per unit length. When the speed is low or zero, the pressure is adjusted accordingly, allowing spot applications and other operations without requiring continuous movement at specific speeds.
Data Source
AI summary
Object: A liquid material application apparatus and a liquid material application method are provided with which a liquid material can be discharged in a predetermined discharge amount per unit time regardless of a relative moving speed in a series of application works.Solution: The liquid material application apparatus includes a discharge head, a robot moving the discharge head relative to a workpiece, a movement control unit controlling relative movement of the discharge head and the workpiece, and a discharge control unit controlling an operation of discharging a liquid material from a discharge head, wherein the discharge control unit executes, in a switchable manner in accordance with an application program, first mode discharge control of changing a discharge amount of the liquid material, which is discharged from the discharge head per unit time, depending on a relative moving speed between the discharge head and the workpiece, and second mode discharge control of operating the discharge head to discharge the liquid material in a predetermined discharge amount per unit time regardless of the relative moving speed. The liquid material application method is implemented using the liquid material application apparatus.