Cutting Machine Rotation Safety Assembly for PTO Overspeed Shutdown
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Solution Overview
Problem
Cutting and splitting machines driven via PTO shafts often exceed safe rotation limits, posing risks of damage to the machine and injury to users, as existing safety measures like user guides and warning labels are insufficient to prevent incorrect use.
Innovation Solution
A safety assembly that includes a sensor, such as a Hall sensor, to measure the number of rotations of the cutting means and automatically terminate machine operation if rotations exceed pre-set ranges, using a control unit to interrupt torque transfer via mechanisms like brakes or clutches to prevent excessive rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the cutting means is increased beyond allowed ranges, then the productivity of the machine is improved, but the reliability and safety of the machine deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-setting a maximum rotation speed value in the control unit before operation. The sensor continuously monitors the actual rotation speed and compares it against this predetermined limit, triggering an automatic shutdown before dangerous conditions can develop. This preventive approach ensures that productivity gains from higher speeds do not compromise machine safety.
2Ease of operation
If user guides and warning labels are used to inform about maximal rotations, then the ease of operation is improved, but the reliability and safety deteriorates
Solution Approach 1:
The patent implements feedback by using a sensor to continuously monitor the actual rotation speed of the cutting means and feeding this information back to the control unit. The control unit compares the measured speed against the pre-set maximum limit and automatically terminates operation when the limit is exceeded. This closed-loop feedback system replaces insufficient warning labels with active, reliable safety control that provides real-time monitoring and automatic protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents damage to the machine and user injury by ensuring timely shutdown of the cutting means when incorrect rotations are detected, thereby ensuring safe operation within designated limits.
Implementation Method 1
The discrete signs of rotation may be electrical pulses, which occur in a particular number of cutting means rotation. The system for sensing rotation may comprise a Hall sensor arranged for detection of rotation by periodic rotation of a magnet installed on a shaft on which the cutting means is installed.
Data Source
Figure 1~2
Figure 3
AI summary
The invention belongs to the field of splitting and cutting-splitting machines, particularly to the field of safety devices for said machines. The cutting or a cutting-splitting machine is provided with a safety assembly for preventing incorrect use, which comprises measurement the number of rotations on any rotatable part enabling cutting means rotation, and turning off the machine operation in case incorrect rotations have been sensed. The safety assembly comprises: - a sensor configured to measure rotations, said sensor being installed on any rotating part, - a control unit configured to receive information about sensed rotations from the sensor and further configured to trigger termination of machine operation in case sensed rotations are outside of a pre-set range. The sensor may be a Hall sensor, an inductive sensor, a speed sensor or any other sensor arranged to detect or measure rotation speed and the number of rotations. It may be installed on a PTO shaft, on a shaft on which the cutting means is installed, or on any intermediate element, which is arranged to transfer torque from the PTO shaft to the cutting means.