## 3 Centralized Lubrication and Waste Grease Recovery Test Platform Test
### Vacuum Degree Test
#### 3.1.4 Oil Output Parameter Test of Grease Suction and Drainer Device  
Oil discharge performance directly affects the effect of the active waste oil recovery device. In order to explore the grease discharge performance of the suction and drainer device, the device was subjected to 12,000 fatigue tests of oil discharge pressure and oil discharge quantity, as shown in Figures 12 and 13. In order to verify the reliability of the measured liposuction performance of the grease suction and drainer devices, descriptive statistical analysis was performed based on the test data in Figures 12 and 13, the results of which are presented in Table 6.  
Figure 12: Oil discharge pressure of the grease suction and drainer devices after 12,000 fatigue tests. Figure 11: Mean plot of vacuum degree for analysis of variance. Table 6 shows the descriptive statistical results of the grease removal performance of the grease suction and drainer devices after 12,000 fatigue tests, including statistics such as sample size, maximum value and minimum value, which are used to study the overall situation of the grease removal performance of the grease suction and drainer device. The absolute kurtosis of the oil discharge quantity and the maximum oil outlet pressure is less than 10, and the absolute skewness of the oil discharge quantity and the maximum oil outlet pressure is less than 3, so the oil discharge quantity and maximum pressure of the oil outlet essentially follow a normal distribution. The coefficient of variation (CV) of the maximum oil pressure is 0.03, and there is a small probability of abnormal value (CV \(<\) 0.15) in the current data. The average value is used to represent the maximum oil pressure in 39 groups of tests, which is 9.48 MPa. The coefficient of variation (CV) of oil displacement was 0.024, and the abnormal value (CV \(<\) 0.15) appeared in the current data. The average value was used to represent the oil output in 39 groups of experiments, which was 3.93 (g/5 times). The maximum oil outlet pressure of the grease suction and drainer devices was calculated with an uncertainty of 0.50, and the maximum oil outlet pressure of the suction and discharge devices was calculated with an uncertainty of 0.35. It indicated that the results of the dynamic oil pressure measurement of the grease suction and drainer device after 12,000 fatigue tests were highly reliable. Table 6 shows that the coefficient of variation is less than 0.15, the probability of outliers is small and the degree of dispersion is small. It shows that, after 12,000 fatigue cycles, the oil pressure and oil output of the tested products are stable; that is, the designed grease suction and drainer device has good grease discharge performance. In Figures 9-13, the error bars chosen for the standard errors are used to visually reflect the precision of the measurements. Combining the above experimental test data, the parameters of the grease suction and drainer devices are highly accurate, and the test \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Variable** & **Sample** & **Sample** & **Minimum** & **Mean** & **Standard** \\
**Name** & **Size** & **Size** & **Value** & **Value** & **Deviation** \\ \hline Maximum pressure & 39 & 10 & 9 & 9.479 & 0.285 \\ of oil outlet/MPa & 39 & 4.1 & 3.7 & 3.928 & 0.094 \\ quantity (g/5 times) & & & & & \\ \hline
**Variable** & **Median** & **Variance** & **Kurtosis** & **Skewness** & **Coefficient** \\
**Name** & & & & & **of Variation** \\ \hline Maximum pressure & 9.5 & 0.081 & \(-\)0.998 & 0.053 & 0.0301 \\ of oil oullet/MPa & 3.9 & 0.009 & \(-\)0.31 & \(-\)0.216 & 0.0240 \\ quantity (g/5 times) & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Results of descriptive statistics of grease discharge performance after 12,000 fatigue tests. Figure 13: Oil discharge quantity of the grease suction and drainer devices after 12,000 fatigue tests. results are stable and reliable.