Realization of a stable detection of 0.5 mm minute actions
Transportation equipment industry
A brake manufacturer that produces disk brakes for a large-size elevator.
A representative of the design department inquired us about the switches used for brake pad "confirmation of opening / closing".
Table of Contents
Client’s Issues
The "Limit switch" has been used for confirmation of opening / closing disk brakes, but there was some trouble in detecting stably "minute actions by 0.5 mm" of brake pad.
To detect the slight movement of the brake pad, a "Size-enlargement mechanism" was provided to the operating part to enlarge and detect the minute actions, however, the installation maintenance and waste in the size-enlargement mechanism may cause accidents.
The client got to know us by the visit our booth in M-tech.
The main focus of the issues
Stable detection of 0.5 mm minute actions
Size-enlargement mechanism is not suitable because of its low safety
Metrol’s suggestions
Conventionally, the "Limit switch" is a flat-spring-system snap action mechanism and there is a dead zone called "movement differential" generated between ON and OFF, which prevents the minute actions from being detected.
Metrol's "precision positioning switch" is a plunger-type precision machine and has no "movement differential" and can stably detect "0.5 mm or less minute actions".
Also, directly attaching the switch to the brake pad eliminates the need for the "size-enlargement mechanism" and significantly improves the maintainability and safety.
Improvements
Realize stable detection of 0.5 mm minute actions
Enhance safety by not using size- enlargement mechanism.
Comment from Metrol representative
Like this case, many brake manufacturers has decided to adopt the "precision positioning switch" after the national notification regarding elevator safety.
"A size-enlargement mechanism to detect minute actions has to be developed"
"Adjusting the installation just took a plenty of time"
Many of our clients have similar troubles in stable detection of minute actions.
We also provide sampling rental service for evaluating the prototype.
Please feel free to contact us.
For further information about the products used in this application
Ultra-small Precision Positioning Switch [PT]
Stably detected 0.5 mm minute actions!!
The top-selling touch switches.
