The Guangdong Provincial Meteorological Observatory released this morning: strong cold air has affected the province's significant cooling, and there will be a large area of ​​low temperature frost on the morning of the 27th.
Abstract: Affected by strong cold air, the province has rainy days on the 25th, the temperature has dropped significantly, and there are 6-8 winds on the coastal waters. On the morning of the 26th, the minimum temperature in the northern mountainous areas of Qingyuan and Shaoguan had fallen below 0 °C, and there was freezing. It is expected that the weather will be fine this day and tomorrow, and the minimum temperature will appear on the morning of the 27th. There will be a large area of ​​frost (ice) in the north central part of the province, but the temperature will rise during the day, so please continue to do cold, antifreeze and windproof work. In addition, a new strong cold air will be added to the province from the 30th, and the temperature will drop again.
First, the weather is live
Affected by strong cold air, the province was cloudy with rain on the 25th, the temperature dropped gradually, accompanied by 4 to 6 northerly winds, and the weather was cold. There was little to moderate rain in northern Guangdong, and the rest of the cities and counties were light rain; the wind in the province was 6-8. On the morning of the 26th, the rains turned sunny in the whole province, the temperature dropped by 5-11 °C compared with the same period on the 25th, and the low temperature below 5 °C appeared in the north central region. On the morning of the 26th, the lowest temperature in the north-central region was 0-5 °C, and in the southern region was 6-8 °C. The temperature in the northern mountainous areas of Qingyuan and Shaoguan had dropped below 0 °C and frozen.
Second, the weather forecast for the next few days
In the next few days, it will continue to be affected by cold air. It is expected that from 26 to 27, most of the province will have fine weather and the temperature will rise during the day, but the temperature will be low in the morning and evening. On the morning of the 27th, there will be a large area of ​​low temperature frost (ice). The lowest temperature in the north of Guangdong, the northern part of the Pearl River Delta and the western part of western Guangdong is -1 to 3 °C, and the lowest temperature in the high-altitude mountainous areas of northern Guangdong can reach -3 to -5 °C, and other areas are 4 to 8 °C.
From 28 to 29, the province was sunny to cloudy and the temperature rose.
From the 30th, our province will be affected by a new strong cold air, and the temperature will drop again significantly.
Guangzhou: 27th, sunny, temperature 4 ~ 17 ° C; 28, cloudy, 6-19 ° C; 29, cloudy, 9 to 21 ° C.
Third, attention and suggestions
On the morning of the 1st and 27th, there will be a large area of ​​low-temperature frost (ice) frozen in the north-central part of the province. It is necessary to continue the work of preventing cold and freezing, especially in the mountainous areas of northern Guangdong.
2, the weather turns cold, easy to induce cardiovascular, respiratory and other diseases, please add clothes to keep warm, especially for the elderly, children and frail patients should pay close attention to the possible impact of weather changes on health.
From the 3rd to the 30th, there will be a new strong cold air affecting our province. Please prepare for defense as soon as possible.
Our bureau will further monitor and timely forecast the weather forecast for strong cold air.
Sanding Belt
Abrasive belt is a belt-shaped tool that can be ground and polished, which is made by bonding abrasives to flexible materials such as paper and cloth with a binder. It is a main form of coated abrasives. Its basic composition is: base material, abrasive and binder, collectively called the three elements of abrasive belt. Abrasive belt is the main tool of the sanding process. Abrasive belt grinding is a soft grinding method, which is a compound processing abrasive tool with multiple functions of grinding, grinding and polishing.
Abrasive tools are tools for grinding, grinding and polishing. Most of the abrasives are artificial abrasives made of abrasives and bonding agents, and natural abrasives are also directly processed from natural ore. In addition to being widely used in machinery manufacturing and other metal processing industries, abrasive tools are also used in the processing of non-metallic materials such as food processing, paper industry and ceramics, glass, stone, plastic, rubber, and wood.
Abrasives are divided into natural abrasives and artificial abrasives. All materials that can be used for grinding or grinding in nature are collectively referred to as natural abrasives.
Natural abrasives mainly include: natural corundum and garnet
Artificial abrasives mainly include: white corundum, brown corundum, silicon carbide, zirconium corundum, synthetic diamond, cubic boron nitride.
How to choose a suitable abrasive belt and further improve the smoothness and flatness of sanding is a very important issue in the use of abrasive belts. Due to the differences in the three major components of abrasive belts and various characteristic factors, abrasive belts can be divided into many varieties according to different grinding objects, grinding conditions and grinding requirements. The following is the classification of abrasive belts according to abrasives. Different abrasive belts are suitable for different products. The following types of belt operations are: automatic grinding, mechanical hand grinding, desktop grinding, and manual tool grinding.
Types of abrasive belts (according to abrasives):
1: Accumulated abrasive belt
Application: Widely used in polishing various non-alloy, low-alloy and high-alloy steel, stainless steel, brass, bronze and other non-ferrous metals. Good self-sharpening, long service life, uniform grinding volume and uniform surface roughness.
2. Brown corundum belt
Application: Widely used in metallurgy, machinery, shipbuilding, wood, building materials, textile printing and dyeing industries. Grinding and polishing of bamboo and wood products, decorative panels, stainless steel, non-ferrous metals and other complex surfaces. Fast cutting, heat resistance, long service life, efficient wear resistance.
3. Ceramic abrasive belt
Application: Widely used in grinding chromium steel, chromium-nickel steel, stainless steel, high-alloy steel, nickel-based alloy, titanium alloy, brass and bronze, etc., with good self-sharpening, strong grinding, and large removal of grinding materials.
4. Silicon carbide belt
Application: Widely used in the grinding and polishing of brass, bronze, titanium alloy, aluminum alloy, glass, ceramics, minerals, stone, rubber, and synthetic materials. The sand surface is sharp, with very high strength and grinding ability, suitable for grinding medium and high density plates. The bucky has strong tension and ultra-wide sub-tension, which can be used for ultra-large abrasive belts.
5. Zirconium corundum abrasive belt
Application: Widely used in the grinding and polishing of steel, alloy steel, cast iron and non-ferrous metals, medium load or heavy load powerful grinding. The rigid polyester fabric is resistant to strong tension and impact, has high abrasion resistance, and has excellent comprehensive cost performance.
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