Hydraulic Cylinder Assembly Shutdown via UPS Pump Swivel Control
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Solution Overview
Problem
Existing hydraulic cylinder arrangements face issues with residual movement of the piston after shutdown, particularly in the absence of shut-off valves, leading to inefficient and potentially hazardous continued operation due to kinetic energy dissipation, and require additional components like a second valve and piston for precise control, which are costly and complex.
Innovation Solution
Incorporating an uninterruptible power supply (UPS) to maintain electrical energy during power failures, allowing for controlled braking of the motor and adjustment of the pump's swivel angle to zero, eliminating the need for shut-off valves and additional components, ensuring rapid and precise hydraulic cylinder standstill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no shut-off valves are provided in the hydraulic cylinder arrangement, then the device complexity is reduced, but the piston continues to move after shutdown due to kinetic energy dissipation, causing residual movement and potential hazards
Solution Approach 1:
The uninterruptible power supply performs preliminary action by maintaining electrical energy in the control unit during power failures, enabling the control system to actively brake the motor and adjust the pump's swivel angle to zero before complete shutdown, preventing residual piston movement without requiring mechanical shut-off valves
Solution Approach 2:
The patent replaces the mechanical shut-off valve system with an electrical control system supported by uninterruptible power supply. Instead of using mechanical valves to interrupt hydraulic connections, the system uses electrical braking and pump swivel angle control to prevent residual movement, thereby reducing device complexity while maintaining reliability
2Measurement precision
If additional components like a second valve and piston are added to achieve precise control and rapid standstill, then the shutdown control precision is improved, but the device complexity and cost increase
Solution Approach 1:
The uninterruptible power supply enables the existing control components (control unit, motor brake, pump swivel control) to perform multiple functions: normal operation control, emergency braking, and shutdown prevention. This multi-functionality achieves precise control and rapid standstill without adding second valves or pistons, maintaining simplicity while improving control precision
3Use of energy by moving object
If the motor is switched off without torque (STO state) during power failure, then energy consumption is reduced, but the pump continues to deliver fluid based on its direction of rotation and oscillation angle, causing uncontrolled piston movement
Solution Approach 1:
The uninterruptible power supply performs preliminary braking action on the motor and preliminary adjustment of the pump's swivel angle to zero before the motor is completely switched off. This preliminary action ensures the pump stops delivering fluid in an uncontrolled manner, preventing hazardous piston movement while the motor is still providing torque for braking
Solution Approach 2:
The uninterruptible power supply maintains continuous electrical energy supply to the control unit during shutdown, enabling continuous control of the motor braking and pump swivel angle adjustment until the piston reaches the desired position. This continuity of useful control action prevents residual movement while transitioning to the energy-saving STO state
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 solution enables rapid, controlled shutdown of the hydraulic cylinder without residual movement, avoiding pressure losses and pressure spikes, and reduces the need for additional components, thus being cost-effective and efficient.
Implementation Method 1
Incorporating an uninterruptible power supply (UPS) to maintain electrical energy during power failures
Implementation Method 2
A hydraulic medium is supplied to the cylinder to displace the piston
Implementation Method 3
A hydraulic medium is supplied to the cylinder to displace the piston
Implementation Method 4
The medium is pumped by a pump, which can be driven, for example, by an electric motor
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Hydraulic cylinder arrangement (1), comprising at least a hydraulic cylinder (2), a motor (3) for driving an adjustable pump (4), the pump (4), and a swivel angle control system (5) for the pump (4), wherein the swivel angle control system (5) comprises at least one actuating piston (6) for adjusting the pump (4) and an electrically controlled valve (7) for controlling the actuating piston (6); wherein at least one delivery direction of the pump (4) and thus a movement of the hydraulic cylinder (2) can be controlled via the swivel angle control system (5); wherein the hydraulic cylinder arrangement (1) comprises an electrical control unit (8) for operating at least the motor (3) and the valve (7);characterized in that the hydraulic cylinder arrangement (1) has an uninterruptible power supply (9) so that, in the event of a power supply failure (10) for the control unit (8), at least the control unit (8) can be supplied with electrical energy by the uninterruptible power supply (9). Method for operating a hydraulic cylinder arrangement.