Maintenance, Test & Measurement, Calibration

Crusher gap measurement

February 2021 Maintenance, Test & Measurement, Calibration

Developed by Mintap, based in Perth, Western Australia, the Closed Side Setting (CSS) measurement device – the C-Gap – is now available through South African-based Control Systems Rustenburg. C-Gap offers accuracy, safety and reliability to the quarrying and mining industries for the measurement of the CSS in gyratory, jaw and cone crushers.

The C-Gap works by placing selected high-density rubber hollow bulbs into the crusher mantle. When the bulb is squeezed between the fixed and moving plates, the air pressure in the hose increases, then, by correlating the air pressure through manual calibration, the CSS is measured between 7 mm and 220 mm with an accuracy of 1 mm.

The process of measuring the CSS on all four sides of a cone crusher takes less than five minutes and requires only one operator. Jaw and gyratory crushers are about the same.

The C-Gap effectively replaces current methods of CSS measurement, namely the use of lead weights, steel drums, aluminium or clay balls, or manual measurement. Because the procedure is so quick and easy, the CSS can be measured every shift on all crushers, ensuring consistent crusher operation by achieving targeted set points across all crews.

Maintaining the CSS

To date, there has not been a quick, accurate and safe way to measure the CSS in larger primary crushers; the CSS on these crushers is usually measured during shutdowns only, meaning it runs unchecked for potentially weeks at a time. This results in reduced crusher performance, placing increased emphasis on downstream circuits.

By measuring every shift, the CSS can be maintained and mantle wear can be documented, assisting with service planning. Operators on sites using the C-Gap commended its safety advantage over the lead weights. Through site comparative trials they noted the C-Gap had an improved accuracy over the use of traditional means. Cost-benefit analyses of sites that currently use lead weights have shown a payback within six months of purchase, when one considers the cost and safe disposal of these. Sites that do not use lead weights enjoy the improved accuracy of the C-Gap.

Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

All-in-one documenting process calibrators
Comtest Maintenance, Test & Measurement, Calibration
The multifunction calibrators perform sourcing, simulation and measurement of pressure, temperature and electrical signals.

Five reasons for force measurement
WIKA Instruments Editor's Choice Maintenance, Test & Measurement, Calibration
Wika takes a closer look at the measured variable of force and gives five reasons to show why force measurement is of particular importance.

High-quality contact lubricants
Vepac Electronics Maintenance, Test & Measurement, Calibration
CG53A is part of the CG series of contact lubricants, designed as an extension of the extremely popular 2X range. The main advantages of these products are reduced contact resistance, even on extremely ...

Field services – beyond break-fix to invaluable organisational insight
Schneider Electric South Africa Maintenance, Test & Measurement, Calibration
An outsourced field services team can assist organisations not only during emergencies but also by providing spares, technical support and 24/7 callout availability.

Pyranometer for monitoring small-scale PV installation efficiency
GHM Messtechnik SA Electrical Power & Protection Maintenance, Test & Measurement, Calibration
The device’s classification level under the ISO 9060:2018 standard guarantees accuracy, reliability, precision and compliance with reference standards.

Condition monitoring on offshore oil platforms
Beckhoff Automation Maintenance, Test & Measurement, Calibration
The steel structures of an offshore platform are exposed to extreme environmental conditions throughout their entire service lives. Difficult sea conditions ranging up to freak waves and aggressive ...

The ‘P’ in predictive maintenance represents progress, not pain
SMC Corporation South Africa Maintenance, Test & Measurement, Calibration
There are three main types of maintenance: reactive, preventative and predictive. But how do you make sense of these terms? Human health can provide an analogy to machine health. Take diabetes, for ...

Precision current loop calibrators
Comtest Maintenance, Test & Measurement, Calibration
The Fluke 709 and 709H mA loop calibrators are built around a user-friendly interface with a quick-set rotary encoder knob.

Why calibrating multipoint thermocouples is so challenging
WIKA Instruments Maintenance, Test & Measurement, Calibration
Multipoint thermocouples monitor temperature cycles extremely accurately, even at 1000°C or higher, necessitating traceable calibration in accordance with DIN EN ISO/IEC 17025 specifications.

Hydraulic deadweight tester for pressure instrument calibration
Instrotech Pressure Measurement & Control Maintenance, Test & Measurement, Calibration
The high-quality piston/cylinder units are manufactured from tungsten carbide, which is known for its low thermal coefficient of expansion.