Coating Tank Rotation Control During Standing-to-Inclined Transfer
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Solution Overview
Problem
Existing coating devices face issues when changing the posture of the coating tank from a standing to an inclined posture during coating, as stopping the rotation of either the drum or the disk can cause the drum to be co-rotated, leading to difficulties in changing the rotation direction and potential adhesion of coating targets.
Innovation Solution
A control method for a coating device that includes a cylindrical drum and a dish-shaped disk, allowing for a first rotation process in a standing posture with opposite directions and a second rotation process in an inclined posture with the same direction, while ensuring synchronized rotation speeds and directions to prevent adhesion and uneven coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotation of the drum is stopped while the disk continues rotating during posture change, then the coating targets can be prevented from adhering to the coating tank, but the drum may be co-rotated by centrifugal force making it impossible to change the rotation direction
Solution Approach 1:
The control device stops the drum rotation in advance before changing the posture from standing to inclined, preventing the drum from being co-rotated by centrifugal force when the disk continues rotating. This preliminary action ensures the drum can be reliably stopped and restarted in the correct direction without unwanted co-rotation.
Solution Approach 2:
The control device monitors the rotation state of both drum and disk, and automatically adjusts their rotation speeds and directions based on the current posture (standing or inclined). This feedback control ensures that the drum and disk rotate in appropriate directions for each posture, preventing adhesion issues and maintaining operational control.
2Adaptability or versatility
If both drum and disk rotation are stopped during posture change, then the coating tank can be repositioned, but the coating targets may adhere to the inner peripheral surface of the coating tank
Solution Approach 1:
Before changing the posture from inclined to standing, the control device stops the drum rotation in advance. This preliminary stopping prevents coating targets from adhering to the coating tank inner surface during the posture transition, while still allowing the necessary position adjustment to occur.
Solution Approach 2:
The system dynamically adjusts the rotation states of the drum and disk based on the current posture and transition requirements. During posture changes, the drum rotation is selectively stopped while the disk may continue rotating, creating a dynamic control strategy that adapts to different operational phases.
3Productivity
If the drum and disk rotate in opposite directions in standing posture, then coating time is reduced through active flow, but changing to inclined posture requires stopping one rotation which causes co-rotation issues
Solution Approach 1:
The control device uses feedback control to monitor the posture (standing or inclined) and automatically adjusts the rotation directions and speeds of the drum and disk. In standing posture, they rotate in opposite directions for high productivity; in inclined posture, they rotate in the same direction. This feedback mechanism manages the rotation control complexity automatically.
Solution Approach 2:
The system dynamically changes the rotation characteristics of the drum and disk based on the operational phase. During coating in standing posture, opposite rotation provides active flow for speed; during posture transition to inclined, the control dynamically adjusts to prevent co-rotation issues, managing complexity through adaptive behavior.
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
This method reduces coating unevenness and shortens the coating time by maintaining synchronized rotation speeds and directions, ensuring efficient and uniform coating application.
Implementation Method 1
the disk is rotated in one direction. Then, a centrifugal force is applied to the coating targets so that the coating targets reach the inner peripheral surface of the drum
Implementation Method 2
by rotating the drum in the other direction, a stirring force is applied to the coating targets having reached the drum, so that the coating targets quickly flow down toward the center of the disk
Implementation Method 3
after the above operation in the standing posture, the coating tank is set in the inclined posture, and the drum is rotated in one direction together with the disk, whereby unevenness of the coating of each coating target can be reduced
Data Source
AI summary
Provided is a control method of a coating device that can perform coating of coating targets well. The control method of a coating device includes a coating tank (25) which includes a drum (28A) having a cylindrical shape and rotatable, and a disk (38A) having a dish shape and disposed to close a lower end of the drum (28A) and rotatable coaxially with the drum (28A). The method executes a first rotation process of setting a posture of the coating tank (25) in a standing posture in which a rotation axis of the coating tank (25) is directed in a vertical direction, rotating the drum (28A) in one direction, and rotating the disk (38A) in the other direction, and a second rotation process of setting a posture of the coating tank (25) in an inclined posture in which the rotation axis is inclined with respect to the vertical direction and rotating the drum (28A) and the disk (38A) in the one direction.