Swing Motor Hydraulic Pressure Control Device
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Solution Overview
Problem
The existing hydraulic pressure control devices for construction machinery fail to rapidly secure the necessary makeup fluid for the swing motor when it is stopped, leading to cavitation phenomena and reduced durability of the hydraulic system.
Innovation Solution
A hydraulic pressure control device that includes a swing motor, a hydraulic pump, a swing control valve unit, a bypass cut valve unit, and a makeup line, where the bypass cut valve is opened for a preset period to provide working fluid from the hydraulic pump to the swing motor after it is stopped, ensuring stable pressure and preventing cavitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the swing control valve unit is switched to neutral position to stop the swing motor, then the turning operation is stopped, but cavitation phenomenon occurs in the hydraulic line and makeup fluid cannot be rapidly supplied
Solution Approach 1:
The bypass cut valve unit is opened in advance before the swing control valve unit is switched to neutral position. This preliminary action maintains hydraulic pressure in the bypass line, enabling rapid supply of makeup fluid to the swing motor when cavitation occurs during stopping, thus preventing damage from fluid shortage
Solution Approach 2:
A bypass line with bypass cut valve unit is introduced as an intermediary pathway. This bypass line connects the hydraulic line upstream and downstream of the swing control valve unit, providing an alternative route for makeup fluid supply that operates independently of the main swing control valve
2Speed
If the supply of working fluid to the swing motor is stopped immediately, then the turning operation stops, but pressure rapidly decreases and cavitation occurs
Solution Approach 1:
The bypass cut valve unit is opened before the swing motor stops, preliminarily establishing a pressure-maintained bypass pathway. This allows the system to rapidly replenish makeup fluid during the stopping process, preventing pressure collapse and cavitation while still achieving timely cessation of turning operation
Solution Approach 2:
The bypass line acts as a cushioning pathway that maintains hydraulic pressure during the transition to stopping. By having the bypass valve opened in advance, the system prepares a pressure buffer that prevents rapid pressure decrease and cavitation when the main fluid supply is reduced
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 rapidly secures the required makeup fluid, improving equipment durability and preventing cavitation phenomena by maintaining hydraulic pressure during the stopping process of the swing motor.
Implementation Method 1
a hydraulic pump configured to discharge working fluid; a bypass cut valve unit disposed downstream of the swing control valve unit in the hydraulic line and configured to open/close the hydraulic line... when the swing control valve unit is operated so as to stop the swing motor, the bypass cut valve unit is opened for a preset period of time and working fluid standby upstream of the bypass cut valve unit is provided to the swing motor through the makeup line
Implementation Method 2
the supply of the working fluid to the swing motor 30 is stopped, so that a cavitation phenomenon is generated in the hydraulic line to which the working fluid is supplied when the swing motor is turned... the bypass cut valve unit is opened for a preset period of time and working fluid standby upstream of the bypass cut valve unit is provided to the swing motor through the makeup line, thereby rapidly securing the amount of makeup fluid
Data Source
AI summary
The present disclosure relates to a hydraulic pressure control device for a swing motor for construction machinery, and more particularly, to a hydraulic pressure control device for a swing motor for construction machinery, which supplements working fluid in the swing motor when a turning operation of an upper body of construction machinery is performed and then stopped. The hydraulic pressure control device for the swing motor for construction machinery according to the present disclosure including the aforementioned configuration may rapidly secure the amount of makeup fluid required by the swing motor when the swing motor is stopped by directly receiving the working fluid discharged from the hydraulic pump P, thereby improving durability of equipment and preventing a cavitation phenomenon.