Excavator Bucket Discharge Control for Fixed-Point Loading
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Solution Overview
Problem
Existing work machines struggle to consistently load transport objects, such as soil and sand, at a fixed point on a loading target due to variations in discharge position caused by the rotation of the bucket.
Innovation Solution
A work machine with a controller that automatically controls the boom, arm, and bucket to maintain the leading end of the bucket in a fixed position relative to the machine body, ensuring the bucket opening faces downward after being vertically aligned at a target loading point, thereby stabilizing the discharge position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only the bucket is rotated during discharge operation, then the discharge operation is simple, but the loading position of the transport object varies
Solution Approach 1:
The patent applies dynamics by transitioning from a static bucket rotation operation to a dynamic coordinated movement of the boom, arm, and bucket. The controller dynamically adjusts the positions of multiple components during the discharge operation to maintain the leading end of the bucket at a fixed position, thereby achieving consistent loading position while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent changes the operational parameters by coordinating the movement of the boom, arm, and bucket together rather than rotating only the bucket. The controller modifies the discharge operation parameters to maintain the leading end position of the bucket constant during the discharge process, ensuring consistent loading position across different discharge operations.
2Productivity
If the bucket rotates during discharge, then the transport object can be discharged, but the discharge position varies from early to late stage of rotation
Solution Approach 1:
The patent applies preliminary action by pre-positioning the leading end of the bucket at the target loading point before discharge begins. The controller coordinates the boom, arm, and bucket movements in advance to establish a fixed reference position, ensuring that the discharge operation maintains position stability throughout the entire discharge process from early to late stage.
Solution Approach 2:
The patent implements feedback control through the controller that monitors and adjusts the positions of the boom, arm, and bucket during the discharge operation. The system continuously compares the actual leading end position with the target position and makes real-time adjustments to maintain discharge position stability, ensuring reliable and consistent loading.
3Adaptability or versatility
If the leading end of the bucket moves during rotation, then the bucket can rotate freely, but the transport object cannot be loaded at a fixed point
Solution Approach 1:
The patent applies segmentation by dividing the bucket discharge mechanism into three independent controllable segments: the boom, the arm, and the bucket. The controller independently controls each segment's movement while coordinating them to maintain the leading end of the bucket at a fixed position. This segmentation allows the bucket to rotate for discharge while preventing the leading end from moving, achieving both rotation freedom and loading precision.
Data Source
AI summary
Provided is a work machine capable of loading a transport object at a fixed point of a loading target. A controller is included that automatically performs an operation of discharging soil and sand held by a bucket (33) by driving a boom (31), an arm (32), and the bucket (33) based on a target loading point (P) set above a loading bed (56). After the controller rotates the bucket (33) such that the opening surface of the bucket (33) becomes vertical at the target loading point (P), the controller drives the boom (31), the arm (32), and the bucket (33) such that the opening surface of the bucket (33) faces downward while maintaining the position (T), with respect to the machine body, of the leading end of the bucket (33) in a front-and-rear direction.