In order to meet the technical requirements, the vacuum degree P = 133 Pa is selected, the pressure rise rate is designed according to technical requirements (p = 0.18 Pa/s), and effective sealing measures are adopted to reduce the pressure rise rate and improve the product quality. , to reduce the amount of nitrogen leakage and reduce production costs. Therefore, a slide valve pump with a large pumping rate was selected; in order to prevent the vacuum pump from stopping and returning oil, an electromagnetic vacuum filling valve was used at the inlet of the vacuum pump; in order to avoid damaging the vacuum system due to vibration, a bellows was installed in the pipe road. Due to the large dust inside the furnace body and the blank body, a vacuum filtration crucible is installed in the pipeline to remove dust; meanwhile, the male also has a vacuum compensation function. In addition, a flange is provided in the upper and lower parts of the male and the upper part can be passed through compressed air for back blowing to clean the filter, and the lower part is used for dust emission.
According to the process, the system can be used by two vacuum nitriding furnaces, and the actual use proves to be feasible. The equipment was designed for a special pottery factory. After several months of normal operation, industrial production has now taken place. The products fired by the equipment meet various requirements and are being tested. The mechanical transmission equipment runs smoothly and reliably, and the vacuum system meets or exceeds the requirements. Its comprehensive technical specifications: lift table travel 1565mm, vacuum chamber size (mm) 3340X1820X2260. furnace maximum operating temperature 1500 °C; furnace vacuum
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