Recently, Jiangsu Tianming Machinery Group developed the "SGZ1000/3x1000 AC variable-frequency dragging scraper conveyor complete sets of technical equipment" and "SGZ900/2x1000 frequency conversion driven top-loading coal (front and rear) complete sets of technical equipment " (less than two equipment Referred to as "frequency conversion scraper conveyor" in Inner Mongolia Erdos Shenhua Shendong Coal Group passed the national technology appraisal. The appraisal committee has determined that the two technical equipments have reached the international advanced level as a whole, one can replace imported products, and one has filled the gap. The two equipments of the “inverter scraper conveyor†are the most critical equipment in the modern mechanized coal mining process for large-scale coal mines. The high-end equipment of this type was previously mainly imported. Major technologies such as heavy-duty scraper conveyor heavy-duty soft start, high reliability long-lived middle tank manufacturing, on-line real-time monitoring and feedback of the entire machine have been monopolized by European and American giants, and coal companies in China can only spend huge sums to purchase, price and supply. The cycle is completely controlled by foreign companies. In addition, there are still drawbacks such as high maintenance costs and sluggish response to after-sales services. Our country has always been subject to control by people. Experts of the appraisal committee stated that the “Inverter Scraper Conveyor†developed by the Tianming Group achieved major technological breakthroughs in the application of frequency conversion technology, automatic chemical condition monitoring, and key component manufacturing technologies. Among them, the application of frequency conversion technology has an epoch-making significance for the development of our scraper conveyor. The working conditions of the fully mechanized coal mining face are severe and are limited by the power grid capacity and space conditions. The problems of heavy load and full load start of the scraper conveyor have been difficult to solve effectively. "Inverter Scraper Conveyor" adopts AC explosion-proof frequency conversion technology to achieve constant torque soft start under full load conditions, multi-motor power balance, and adjust the operating speed with load changes, effectively reduce energy consumption and improve equipment life. Scraper conveyor operating condition monitoring and control technology is another major achievement, achieving high torque mechanical overload and intelligent electrical protection, control system with self-diagnostic function, historical data storage. This technology establishes a technical support platform for the realization of an unmanned fully automatic working surface. In addition, the use of the central slot casting and welding process with independent intellectual property rights improves the reliability and wear resistance of the equipment.
Why is the air dry in winter?
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What we call humidity is divided into two kinds, absolute humidity and relative humidity.
Absolute humidity refers to the amount of water molecules per cubic meter of air.
Relative humidity refers to the ratio between "absolute humidity" and "saturation humidity".
"Saturation humidity" refers to the absolute humidity required for the water vapor in the atmosphere to reach saturation at a certain temperature. Saturation humidity is also closely related to temperature. The higher the temperature, the greater its value.
The drying or wetting we usually feel does not have a great relationship with absolute humidity, but mainly depends on relative humidity. Therefore, this issue should be discussed as follows:
On the one hand, when the temperature is low in winter and the saturated vapor pressure is small, the absolute humidity of the air is small.
On the other hand, when the temperature is low in winter, the value of saturated humidity is also small. When the absolute humidity is the same, the relative humidity is greater.
Generally speaking, there are positive and negative effects of temperature on humidity. Which role plays a major role should be discussed according to the actual situation.
In some areas it gets dry in winter, while in others it may get wet. The temperature is low in winter. Even if the relative humidity is 100%, the water vapor content is still very low. After we inhale air, the air is heated to body temperature, and the relative humidity will become very low, so we will feel dry. The air we exhale is basically saturated steam at body temperature, so we consume a lot of water when we breathe.
The air near the skin will also be heated, so the moisture of the skin is also easy to evaporate
The doctor suggested that an Aroma Diffuser should be placed indoors, which can effectively and immediately solve the problem of indoor air drying, humidify the air and solve the problem of air drying. The ultrasonic aroma diffuser should be used, and the fog should be sprayed out through vibration