Shovel Pump Flow Switching for Combined Attachment Operation
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Solution Overview
Problem
Existing techniques fail to appropriately adjust the flow rate of hydraulic pumps during combined operations of auxiliary attachments and other driven elements, leading to potential breakdowns due to excessive hydraulic oil flow.
Innovation Solution
A shovel system equipped with an undercarriage, upper slewing structure, boom, arm, auxiliary attachment, hydraulic pump, input device, and controller, which allows for setting and adjustment of the hydraulic pump's flow rate during combined operations through a user-inputted setting, ensuring appropriate flow rates are maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flow rate of the hydraulic pump is increased to cope with combined operation, then the productivity is improved, but the hydraulic oil flow rate supplied to the end attachment becomes excessively high causing breakdown
Solution Approach 1:
The patent implements dynamic flow rate control by switching between a first flow rate (when only auxiliary attachment operates) and a second flow rate (when both auxiliary attachment and driven element operate simultaneously). The controller dynamically adjusts the hydraulic pump's flow rate based on real-time operation mode detection, ensuring the end attachment receives appropriate flow rates and preventing breakdown while maintaining productivity during combined operations.
Solution Approach 2:
The patent changes the flow rate parameter of the hydraulic pump based on operation conditions. By detecting whether a driven element is operating simultaneously with the auxiliary attachment, the system switches between different flow rate parameters (first flow rate vs. second flow rate), thereby preventing excessive flow to the end attachment during combined operations while maintaining adequate productivity.
2Ease of operation
If the flow rate of the hydraulic pump is maintained at a high level for auxiliary attachment operation, then the ease of operation is improved, but the risk of breakdown increases during combined operation
Solution Approach 1:
The system dynamically adjusts the hydraulic pump flow rate based on real-time detection of operation modes. When only the auxiliary attachment operates, a higher first flow rate is supplied for ease of operation. When a driven element operates simultaneously, the system switches to a lower second flow rate to prevent breakdown, thereby dynamically balancing ease of operation with safety.
Solution Approach 2:
The controller continuously monitors the operation state of the driven elements and provides feedback to adjust the hydraulic pump flow rate. This feedback mechanism ensures that when combined operation is detected, the flow rate is reduced to prevent breakdown, while maintaining high flow rate during single operation for ease of use.
Data Source
AI summary
A shovel includes an undercarriage, an upper slewing structure which is rotatably mounted on the undercarriage, a boom attached to the upper slewing structure, an arm attached to a tip end of the boom, an auxiliary attachment attached to a tip end of the arm, a main pump configured to supply a hydraulic oil to the auxiliary attachment and other hydraulic actuators, and a controller. The controller performs a setting related to a flow rate of the main pump at a time of a combined operation in which the auxiliary attachment and the other hydraulic actuators are operated simultaneously.