Research and development expenses in some industries (unit: 100 million yuan) 
Investment intensity of R&D in some industries (unit: %) According to the industry, high-tech manufacturing research and experimental development (R&D) funds were 291.57 billion yuan, and the input intensity (ratio to main business income) was 1.9%; equipment manufacturing research and The R&D expenditure was 617.66 billion yuan and the input intensity was 1.51%. Among the industrial enterprises above designated size, there are 7 major industries in which R&D expenditures exceed 50 billion yuan. The proportion of these 7 industries accounts for the research and experimental development (R&D) funds of all industrial enterprises above designated size. 60.2%; 9 research and experimental development (R&D) funds invested in more than 10 billion yuan and the input intensity exceeds the average level of industrial enterprises above designated size 
According to the types of activities, the national basic research funds were 82.29 billion yuan, up 14.9% over the previous year; the applied research funds were 161.05 billion yuan, up 5.4%; the experimental development funds were 1,324.34 billion yuan, up 11.1%. The proportion of basic research, applied research and experimental development funds was 5.2%, 10.3% and 84.5% respectively. According to the main activity, the expenditure of various enterprises was 1,124.4 billion yuan, an increase of 11.6% over the previous year; the government's research expenditure was 226.02 billion yuan, an increase of 5.8%; the expenditure of higher education institutions was 107.22 billion yuan, an increase of 7.4%. The proportion of enterprises, government-owned research institutions, and higher education institutions accounted for 77.5%, 14.4%, and 6.8%, respectively.It is suitable for the mine with explosive dangerous gas and coal dust. It can control and protect the start and stop of less than 4 three-phase squirrel cage asynchronous motors in the AC 50 Hz and rated voltage ac1140v (660V), and the phase sequence can be changed when stopping. It is especially suitable for the centralized monitoring of mining, transportation, coal mining and other dynamic loads.
The flameproof shell of the combined switch is square and installed on the prying base. It is welded with 16mm thick Q235A steel plate, which is beautiful in appearance and durable in strength.
Mine Flameproof Screen,Coal Flameproof Display,Coal Flame Proof Display,Mining Flame Proof Display
Jinzhou Jinshi Mining Equipment Technology Co., Ltd. , https://www.jsminingeqpt.com