A Zero Speed Switch (ZSS) is a critical safety device used in crushers and other heavy machinery to monitor the rotational speed of shafts, pulleys, or conveyor belts. If the speed drops below a preset threshold (or stops entirely), the ZSS triggers an alarm or shuts down the system to prevent damage or hazards.
Role of Zero Speed Switch in Crushers:
1. Overload Protection – Detects jams or blockages in the crusher by sensing a sudden drop in speed.
2. Belt Slip Monitoring – Prevents belt damage by detecting if the conveyor belt stops moving while the motor is running.
3. Equipment Safety – Avoids mechanical failures due to unexpected stoppages (e.g., bearing seizure, motor failure).
4. Process Control – Ensures continuous operation by signaling when material flow is interrupted.
How It Works:
– A sensor (proximity/inductive/magnetic) is installed near a rotating component (e.g., shaft, gear, or pulley).
– The ZSS counts pulses per minute (PPM). If pulses stop or fall below a set limit, it activates a relay to stop the crusher or alert operators.
Common Applications in Crushers:
– Jaw Crushers – Monitors flywheel rotation.
– Impact Crushers – Checks rotor speed.
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onveyor Systems – Ensures belts are moving at proper speed.
Installation Tips:
– Mount the sensor close to a rotating part with detectable metal teeth/notches.
– Adjust sensitivity based on minimum operational speed.
– Test regularly to ensure proper functionality.
Would you like recommendations for specific ZSS models for crushers?
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