Suspension Conveying Device With Variable Pitch Screw Shafts
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Solution Overview
Problem
Conventional suspension conveying devices for automotive vehicle bodies in pretreatment electrodeposition processes require multiple motors and complex speed control systems, leading to high equipment costs and potential malfunctions during tilting operations.
Innovation Solution
A suspension conveying device with screw shafts having low-speed and high-speed drive regions, driven by a single motor at a fixed speed, allowing for automatic tilting of the conveyed object during elevation or lowering, simplifying the control system and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple motors and complex speed control systems are used to tilt the conveyed object during elevation/lowering, then the tilting function is achieved, but the equipment cost increases and the system becomes more complex
Solution Approach 1:
The screw shafts are designed with different feed pitches in different regions: a first feed pitch in a first region and a second feed pitch (different from the first) in a second region. This local variation in feed pitch allows one motor to achieve variable speed control at different positions along the suspension line, enabling the tilting function without requiring multiple motors or complex control systems.
2Ease of operation
If multiple motors and complex speed control systems are used to tilt the conveyed object during elevation/lowering, then the tilting function is achieved, but the equipment cost increases
Solution Approach 1:
The screw shafts are designed with different feed pitches in different regions: a first feed pitch in a first region and a second feed pitch (different from the first) in a second region. This local variation in feed pitch allows one motor to achieve variable speed control at different positions along the suspension line, enabling the tilting function without requiring multiple motors or complex control systems.
3Ease of operation
If individual speed control of multiple motors is implemented, then the tilting function is achieved, but the risk of electrical system malfunction increases
Solution Approach 1:
The screw shafts are designed with different feed pitches in different regions: a first feed pitch in a first region and a second feed pitch (different from the first) in a second region. This local variation in feed pitch allows one motor to achieve variable speed control at different positions along the suspension line, enabling the tilting function without requiring multiple motors or complex control systems.
Solution Approach 2:
The variable feed pitch structure of the screw shaft automatically provides speed variation during the elevation/lowering process. As the suspension line is wound or unwound, the different feed pitch regions naturally produce different linear speeds from a constant rotational speed motor, eliminating the need for complex electronic speed control and reducing points of failure.
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
The device enables stable and reliable tilting of the automotive vehicle body during immersion and withdrawal from treatment tanks, reducing residual treatment liquid and operational costs by eliminating the need for complex speed control systems.
Implementation Method 1
screw shafts self-rotatably borne by the conveying traveling body and driven bodies engaged with the screw shafts and moved reciprocally by forward/reverse rotation of the screw shafts
Data Source
AI summary
A suspension conveying device according to the present invention includes screw shafts of two suspension line pulling-up/feeding mechanisms in a conveying traveling body 1. The screw shafts have low-speed drive regions, in which feed pitches for driven bodies are small, and high-speed drive regions, in which feed pitches for the driven bodies are large. The screw shafts are installed so that the low-speed drive regions and the high-speed drive regions are disposed mutually oppositely as viewed from the driven bodies when a conveyed object supporter is at one end of an elevation/lowering stroke, and the conveyed object supporter is tilted in a middle of the elevation/lowering stroke when the screw shafts are driven to undergo forward/reverse rotation at a fixed speed by a motor.