Work Machine Cab Interference Prevention via Dynamic Bucket Angle Control
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Solution Overview
Problem
Existing interference prevention devices for construction machines do not account for the angle of the bucket, leading to excessive restriction of the attachment's movement range and potential interference with the cab.
Innovation Solution
A work machine equipped with sensors to measure the angles of the boom, arm, and end attachment, along with a control device that restricts motion based on these measurements to prevent interference with the cab, allowing for a more precise and appropriate restriction of the attachment's movement range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stop area is set to prevent interference of the bucket and the cab without detecting the bucket angle, then the cab is protected from interference, but the range of movement of the attachment is excessively restricted
Solution Approach 1:
The interference prevention system dynamically adjusts the stop area boundaries based on the real-time angle of the bucket. When the bucket angle changes, the control device recalculates and updates the stop area to reflect the actual position of the bucket tip. This dynamic adaptation allows the attachment to move within a broader range while still preventing interference with the cab, resolving the contradiction between protection reliability and movement versatility.
Solution Approach 2:
The system changes the parameters defining the stop area (specifically the boundary coordinates) based on the detected bucket angle. By using the bucket angle as a variable parameter, the stop area is no longer fixed but adapts to different bucket positions. This parameter-based approach enables the attachment to operate with greater freedom while maintaining cab protection, addressing the contradiction between excessive restriction and adequate protection.
2Ease of operation
If a fixed stop area is used without considering bucket angle, then the system is simple to operate, but the attachment movement is unnecessarily limited
Solution Approach 1:
The interference prevention system operates autonomously by automatically detecting the bucket angle through sensors and dynamically adjusting the stop area without requiring manual intervention. The control device continuously monitors bucket position and independently recalculates the stop area boundaries, enabling the system to adapt to changing conditions while maintaining ease of operation. This self-adjusting capability improves productivity by eliminating unnecessary movement restrictions without adding operational complexity for the user.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A work machine according to an embodiment of the present invention, which has a function to prevent the interference of a lift-mag (6) and a cab (10), includes a traveling undercarriage (1), an upper rotating structure (3), the cab (10), an attachment including a boom (4) and an arm (5), a boom angle sensor (S1) that detects the angle of rotation of the boom (4), an arm angle sensor (S2) that detects the angle of rotation of the arm (5), an end attachment angle sensor (S3) that detects the angle of rotation of a lift-mag (6) attached to the end of the arm (5), and a controller (30) that restricts or stops the motion of reducing a distance between the lift-mag (6) and the cab (10) in response to determining that the lift-mag (6) has entered an interference prevention region based on the outputs of the boom angle sensor (S1), the arm angle sensor (S2), and the end attachment angle sensor (S3).