Shovel Boom Cylinder Pressure Control for Smooth Raising
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Solution Overview
Problem
The existing shovel designs face difficulties in smoothly raising the boom during excavation due to hydraulic oil flowing into the arm cylinder, leading to increased pressure loss and reduced efficiency in lifting excavated soil.
Innovation Solution
A control device is integrated into the shovel to increase the pressure of hydraulic oil flowing into the boom cylinder based on information from sensors, such as angle sensors and pressure sensors, before the boom raising operation, thereby optimizing the hydraulic flow and reducing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic oil flows into the arm cylinder during boom raising operation, then the arm cylinder can perform its function, but the boom raising motion becomes unsmooth and pressure loss increases
Solution Approach 1:
The control device performs preliminary action by increasing hydraulic oil pressure in the boom cylinder before the boom raising operation is initiated. This advance pressure buildup ensures that when the boom raising operation starts, adequate pressure is already available, preventing oil from diverting to the arm cylinder and ensuring smooth boom raising motion without energy loss.
Solution Approach 2:
The control device uses feedback from detection devices (such as sensors monitoring boom position, arm position, and hydraulic pressure) to determine when to increase pressure. Based on this feedback information about the current state of the attachment, the control device dynamically adjusts hydraulic pressure to prevent oil diversion to the arm cylinder during boom raising, thereby eliminating pressure loss and ensuring smooth operation.
2Productivity
If hydraulic pressure is increased before boom raising operation, then boom raising efficiency is improved, but additional energy consumption occurs during pressure buildup
Solution Approach 1:
The control device performs preliminary action by increasing hydraulic oil pressure in the boom cylinder before the boom raising operation is initiated. This advance pressure buildup ensures that when the boom raising operation starts, adequate pressure is already available, preventing oil from diverting to the arm cylinder and ensuring smooth boom raising motion without energy loss.
Solution Approach 2:
The control device applies periodic action by intermittently increasing hydraulic pressure based on detected operational conditions. Rather than maintaining continuously high pressure, the system selectively increases pressure only when conditions indicate that boom raising is about to occur or is occurring, thereby improving productivity while minimizing unnecessary energy consumption during pressure buildup.
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 enables a smoother boom raising motion during excavation by ensuring adequate pressure in the boom cylinder, enhancing the efficiency of lifting excavated soil and reducing energy consumption.
Implementation Method 1
The control device is configured to increase the pressure of hydraulic oil flowable into the boom cylinder in accordance with the information on the attachment before a boom raising operation is performed
Data Source
AI summary
A shovel includes a lower traveling body, an upper turning body turnably mounted on the lower traveling body, a cab mounted on the upper turning body, an attachment including a boom attached to the upper turning body, a boom cylinder configured to drive the boom, a control device configured to control hydraulic oil flowable into the boom cylinder, and an information obtaining device configured to obtain information on the attachment. The control device is configured to increase the pressure of hydraulic oil flowable into the boom cylinder in accordance with the information on the attachment before a boom raising operation is performed.