Gas Spring Counterbalancing with Automatic Pressure Compensation
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Solution Overview
Problem
Gas springs used in counterbalancing industrial robots are affected by gas leakage and temperature variations, leading to unwanted production stoppages due to pressure fluctuations, which existing solutions either require frequent servicing or interrupt operations.
Innovation Solution
A counterbalancing arrangement incorporating a compressor system with a pressure sensor and control valve that automatically compensates for pressure changes in the gas spring, maintaining optimal pressure levels regardless of leakage or temperature changes, thereby minimizing the need for maintenance and production interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas spring is used for counterbalancing robot parts, then the counterbalancing efficiency is improved and the drive components can be made smaller, but the system becomes sensitive to temperature variations and gas leakage causing pressure fluctuations
Solution Approach 1:
The patent implements a feedback control system where a pressure sensor continuously monitors the gas pressure in the spring and sends signals to a control valve. The control valve automatically adjusts the gas pressure by opening or closing based on the sensor feedback, compensating for temperature variations and gas leakage to maintain stable counterbalancing pressure
Solution Approach 2:
The system performs self-regulation of gas pressure through the automatic control valve and pressure sensor combination. The pressure sensor detects pressure deviations and the control valve automatically corrects them without external intervention, enabling the system to maintain optimal pressure levels autonomously despite environmental changes
2Device complexity
If the gas pressure is manually adjusted or monitored without automatic control, then the device complexity is reduced, but production stoppages increase due to frequent servicing
Solution Approach 1:
The pressure sensor and control valve system enables self-diagnosis and self-correction of pressure deviations. The pressure sensor continuously monitors gas pressure and the control valve automatically adjusts it when deviations occur, eliminating the need for manual servicing and preventing production stoppages
Solution Approach 2:
The feedback loop between the pressure sensor and control valve creates an automatic monitoring and adjustment system. When gas pressure deviates from the optimal range, the sensor detects it and triggers the control valve to restore pressure, ensuring continuous operation without manual intervention
3Reliability
If the control valve remains closed to maintain pressure, then gas leakage compensation is improved, but the system cannot respond to temperature increases that raise pressure
Solution Approach 1:
The pressure sensor provides continuous feedback on the actual gas pressure, enabling the control valve to respond dynamically to both pressure decreases (from leakage) and pressure increases (from temperature rises). The valve opens to add gas when pressure drops and closes or releases gas when pressure exceeds the optimal range
Solution Approach 2:
The control valve transitions from a static closed position to a dynamic control element that continuously adjusts its opening based on real-time pressure conditions. This dynamic adjustment allows the system to adapt to varying temperature conditions and gas leakage rates, maintaining optimal pressure throughout operation
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 ensures a stable counterbalancing performance across varying conditions, reducing the frequency of unwanted production stops and maintaining operational efficiency by automatically adjusting gas pressure in real-time.
Implementation Method 1
A counterbalancing arrangement (1) for counterbalancing two mutually movable parts (2, 3) to counteract the gravitational force (4) of at least one of the movable parts (2, 3)
Implementation Method 2
a compressor (6) adapted to supply gas to the gas spring (4)
Implementation Method 3
The automatic control system (7) comprises a pressure sensor (8) and a pressure control valve (9)
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A counterbalancing arrangement and a method for counterbalancing two mutually movable parts, which is arranged to counteract the gravitational force of at least one of the movable parts. The counterbalancing arrangement includes a gas spring and a compressor system. The compressor system is designed to sense a pressure in the gas spring and to adjust the pressure if the pressure deviates from a predetermined value. The counterbalancing arrangement can be used for counterbalancing an industrial robot arm and is capable of maintaining its working capacity regardless of any gas leakage and variations in the ambient temperature so as to result in very few unwanted stops occasioned by a need for servicing the balancing spring of the counterbalancing arrangement.