Crane Control Apparatus Predicting Braking Distance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cranes face challenges in accurately predicting and displaying the braking distance and swing range of loads and hooks during stopping operations, leading to potential collisions with buildings.
Innovation Solution
A crane equipped with a camera for downward imaging, a control apparatus that generates filtered control signals and predicts braking distances, and an image display to visualize these predictions, allowing operators to grasp the surrounding conditions and perform avoidance maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a filtered control signal is used to provide a deceleration period for the boom, then the swing of the load is suppressed, but the braking distance increases which raises the possibility of collision with buildings
Solution Approach 1:
The system performs preliminary action by predicting the braking distance and swing range before the boom actually stops, and displays this information in advance to the operator. This allows the operator to take preventive action (such as positioning the boom further from buildings) before the collision risk materializes, thus resolving the contradiction between load stability and braking distance.
2Speed
If the operator performs stopping operation of the boom, then the boom motion is halted, but the boom continues swiveling while decelerating which increases collision risk
Solution Approach 1:
The system implements feedback by continuously monitoring the boom's motion state and calculating the predicted braking distance and swing range in real-time. This information is fed back to the operator through the display device, enabling the operator to adjust the stopping operation or positioning to avoid collision, thus resolving the contradiction between speed control and collision risk.
3Stability of the object's composition
If a longer deceleration period is provided to suppress load swing, then load stability is improved, but the braking distance increases making collision avoidance more difficult
Solution Approach 1:
The system resolves the contradiction by adding a new dimension of information display (predicted braking distance and swing range) to the operator interface. This transforms the problem from a physical constraint into an information-based decision support system, allowing the operator to plan avoidance maneuvers in the time dimension while the deceleration proceeds in the spatial dimension.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention addresses the problem of providing a crane that can ascertain the state of an area surrounding a hook or a cargo suspended on the hook and that can simultaneously ascertain a braking distance during stopping operations. The invention comprises: drive devices 31-34 that move a boom 7; a control apparatus 20 that controls the operation state of the drive devices 31-34; a camera 41 that photographs, from the distal end portion of the boom 7, an area below said portion; and image display devices 43 and 65 that display the image photographed by the camera 41. For the purpose of stopping the movement of the boom 7, the control apparatus 20 filters basic control signals S for the drive devices 31-34 to create filtered control signals Sf, controls the drive devices 31-34 on the basis of the filtered control signals Sf, estimates the braking distance for the boom 7, and displays the same on the image display devices 43 and 65.