As the core equipment for cement strength testing, the operation status of cement mortar mixer directly affects the accuracy of test data. Daily maintenance and calibration are key links to ensure stable equipment performance and reduce errors, which need to be systematically implemented from three aspects: mechanical cleaning, component inspection, and parameter calibration.
Mechanical cleaning and rust prevention treatment are the core of basic maintenance. After each experiment, it is necessary to immediately clean the residual cement mortar in the mixing pot to avoid damaging the pot body or mixing blades after hardening. Use a soft bristled brush or specialized cleaning tool to focus on removing material accumulation areas such as blade roots and pot wall gaps, to prevent residue from affecting the uniformity of the next mixing. At the same time, regularly apply anti rust oil to metal components such as transmission shafts and gears, especially in humid environments, to shorten the anti rust cycle and avoid rust causing transmission jamming or abnormal vibration.
Regular inspection and replacement of key components are key to ensuring equipment accuracy. The gap between the mixing blade and the pot wall directly affects the uniformity of the sand mixing. It is necessary to measure the gap with a feeler gauge every month, and the standard gap should be controlled within the range of 2 ± 1mm. If the gap exceeds the tolerance, the blade position needs to be adjusted or worn parts need to be replaced. In addition, check the tightness of the transmission belt. If it is too loose, it will cause unstable speed, and if it is too tight, it will accelerate bearing wear. You can judge whether adjustment is needed by pressing the middle of the belt and observing the sag (usually 10-15mm).
Parameter calibration and functional verification are the last line of defense to ensure data reliability. Every quarter, standard weights need to be used to calibrate the speed and time control module of the mixer, such as verifying the speed stability of the mixing blades at low speed (140 ± 5r/min) and high speed (285 ± 10r/min), as well as the accuracy of the automatic shutdown function. At the same time, by conducting a blank test (without adding cement mortar), observe whether the equipment runs smoothly, whether there are any abnormal vibrations or noise, and ensure that the test environment meets the standard requirements.
Through systematic daily maintenance and regular calibration, equipment errors can be minimized to provide reliable data support for cement strength testing.