Timber-Working Device Hazard Zone Control via Orientation Sensors
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Solution Overview
Problem
Timber-working devices, particularly those with chainsaws, pose hazards due to 'chain shot' and other projectile risks, and the drive mechanisms can pose risks during high-speed operations, necessitating a method to control operations to prevent accidents.
Innovation Solution
A system utilizing orientation sensors to detect when a predetermined location, such as an operator cab, is within a hazard zone, with a controller receiving signals from these sensors to control the operation of the timber-working device, including disabling the chainsaw or drive mechanism to prevent accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the timber-working device operates at high speed (up to 5 m/s) to improve productivity, then the processing efficiency increases, but the hazard of chain shot and projectile risks increases
Solution Approach 1:
The control system applies preliminary anti-action by detecting the operator's position relative to the hazard zone before the hazardous event occurs. Orientation sensors continuously monitor the carrier vehicle's position, and when the operator enters the hazard zone, the system preemptively disables the chainsaw or reduces feed rate, preventing chain shot accidents before they can happen during high-speed operation.
Solution Approach 2:
The system implements feedback control by continuously monitoring the orientation of the carrier vehicle and the position of the operator relative to the hazard zone. The control system receives signals from orientation sensors, processes this information, and automatically adjusts the operation of the timber-working device by disabling hazardous functions or reducing feed rates when the operator is within the hazard zone, thereby maintaining safety during high-speed operation.
2Ease of operation
If the operator cab is positioned within easy reach of the timber-working device to improve ease of operation, then the operator can better control the device, but the operator is exposed to the hazard zone
Solution Approach 1:
The control system acts as an intermediary between the operator and the hazardous timber-working functions. The operator can control the carrier vehicle from a safe position, and the automated control system mediates the operation of the chainsaw and feed mechanism based on real-time orientation sensor data, allowing the operator to maintain control without being exposed to chain shot hazards.
Solution Approach 2:
The system replaces direct mechanical control with automated electronic control. Instead of the operator manually controlling the chainsaw and feed mechanism from a potentially hazardous position, orientation sensors and a control system automatically monitor and control these functions, substituting mechanical operator intervention with an automated safety system that eliminates the need for the operator to be in the hazard zone.
3Object-affected harmful factors
If the hazard zone is reduced to minimize safety risks, then the area exposed to chain shot is reduced, but the operational flexibility of the device is limited
Solution Approach 1:
The system applies dynamics by making the hazard zone definition adaptive rather than fixed. The control system dynamically adjusts the operational parameters based on the real-time position of the operator relative to the hazard zone. When the operator is outside the hazard zone, full operational flexibility is maintained. When the operator enters the hazard zone, the system dynamically reduces the active hazard area by disabling only the specific functions that would create risk, rather than limiting the entire device's operational flexibility.
Data Source
AI summary
Method, apparatus, and system for operation of a timber-working device configured to perform at least one operation having an associated hazard zone. At least one signal from at least one orientation sensor associated with the timber-working head may indicate whether a predetermined location is within the hazard zone based on the orientation of the timber-working head. Operation of the timber-working head can be controlled based on the signal.