Straightening Device with Hyperbolic Rolls and Single-Effect Hydraulic Actuator
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Solution Overview
Problem
Existing straightening machines with hyperbolic rolls for metal products face complexity in construction and management, long reaction times during overload conditions, and high maintenance costs due to the complexity of double-effect hydraulic systems and the need for cranes for access.
Innovation Solution
A straightening device with a single-effect hydraulic actuator associated with the lower roll unit, which detects pressure and position deviations to automatically lower the roll in case of overload, using the roll's weight to safeguard the machine and simplify maintenance by eliminating the need for cranes and reducing hydraulic fluid quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-effect hydraulic system is used to control both upward and downward movement of rolls, then the rolls can be precisely positioned and controlled, but the device complexity increases and maintenance becomes more difficult
Solution Approach 1:
The invention extracts and removes the downward movement control function from the hydraulic system. The single-effect hydraulic actuator only controls upward movement, while downward movement is achieved by gravity and spring force, simplifying the hydraulic system while maintaining roll positioning control
Solution Approach 2:
The invention uses spring force and gravity as counterweights to the hydraulic upward force. The spring-loaded mechanism provides a downward force that balances the hydraulic upward force during normal operation, enabling precise positioning without requiring a complex double-effect hydraulic system
2Reliability
If hydraulic fluid is used to maintain roll position against gravity, then precise positioning is achieved, but a large quantity of hydraulic fluid is required and reaction time during overload is delayed
Solution Approach 1:
The invention extracts the function of maintaining roll position against gravity from the hydraulic fluid. Instead of using hydraulic fluid to continuously counteract gravity, the system uses spring force and gravity itself to maintain position, requiring minimal hydraulic fluid only for controlled movement
Solution Approach 2:
The hydraulic system operates periodically rather than continuously - hydraulic fluid is supplied only when movement is needed, and the spring-loaded mechanism maintains position during intervals between hydraulic activations, reducing overall fluid quantity and improving response time
3Adaptability or versatility
If the upper roll is made mobile for adjustment, then passage gap can be adjusted for different products, but the weight of the roll requires great force to move it during safety activation
Solution Approach 1:
The spring-loaded mechanism provides a counterweight force that balances the gravitational force on the mobile roll. During normal adjustment, the hydraulic system only needs to overcome spring force, not the full weight of the roll. During safety activation, the spring force assists gravity in rapidly moving the roll downward, reducing the force required
Solution Approach 2:
The system transitions from a static balanced state to a dynamic rapid movement state during safety activation. The spring-loaded mechanism allows the roll to be held in position during normal operation, then rapidly move when needed, optimizing both adjustability and safety response
4Reliability
If both rolls are equipped with hydraulic systems for safety control, then overload protection is provided on both rolls, but the construction and management complexity increases
Solution Approach 1:
The single-effect hydraulic actuator on the lower roll serves multiple functions: it controls upward movement for passage gap adjustment, maintains position against spring force, and enables rapid downward movement for safety protection. This multi-functionality eliminates the need for separate hydraulic systems on both rolls
Solution Approach 2:
The mobile upper roll uses its own weight and the spring-loaded mechanism for safety protection, without requiring a separate hydraulic system. The lower roll's hydraulic actuator controls both rolls' positioning, and during overload, the upper roll automatically lowers due to gravity and spring force
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 solution simplifies the construction and management of the device, reduces reaction times during overloads, and lowers maintenance costs by using the roll's weight for immediate downward movement and allowing easier access for maintenance, thus enhancing operational safety and efficiency.
Implementation Method 1
a lower roll unit (14), in association with a hydraulic safety/control device (19) comprising a single-effect hydraulic actuator (26)
Implementation Method 2
which selectively yields when the pressure acting on the lower roll unit (14) exceeds a predetermined value
Implementation Method 3
using the roll's weight to safeguard the machine and simplify maintenance
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
Straightening device for long or rod-shaped metal products (18), comprising an upper roll unit (12) and a lower roll unit (14), wherein the upper roll unit (12) is mobile and can be positioned vertically at least in the step where a passage gap (17) of said products (18) is set to a desired value, wherein a hydraulic safety /control device is associated with the lower roll unit (14) and comprises a single-effect hydraulic actuator (19, 1 19) of the selectively yielding type when an overload condition higher than a predetermined value is detected on said lower roll unit (14).