Optimization Technology of Frequency Conversion Constant Pressure Control System of Mine Emulsion Pump Station in Electrical Engineering and Automation Specialty

Table 4

Wear marks on polycrystalline diamond disc.

Item	Wear scar	SEM	Rubber	Copper surface	Alloy ball
Filter	1.22	0.54	0.99	0.8	1.46
Measure	1.23	3.19	2.21	2.53	1.8
Supercharge	2.09	4.39	5.99	3.75	5.27
Regulate	1.66	3.37	4.99	4.68	3.24
Split	2.66	1.88	2.95	1.93	4.21