The Jiangxi Meteorological Observatory predicts that in the next six days, Jiangxi Province will be dominated by low-temperature and rainy (snow) weather. The specific forecast is as follows:
From 5 to 6 days, the cold air is affected by the south, the wind power in the province is increasing, the temperature has dropped, and tomorrow, the north is cloudy, some have sleet or light snow, and there is light rain or sleet on cloudy days in the middle of the sky. There was light rain; the day after tomorrow, the snow stopped turning cloudy and cloudy; in the cloudy days, some of them had light rain or sleet, and the south was cloudy and some had light rain.
The province was cloudy on the 7th.
On the 8th to 9th, it was cloudy and cloudy in the north, and there was some light rain or sleet. There was light rain on the cloudy day in southern Yunnan.
The recent weather conditions have a certain impact on the development of Jiangxi's agricultural activities; the rainy and sloppy weather in the central and southern parts is not good for the growth of winter crops; the daily minimum temperatures in the province are generally minus 2 °C ~ 0 °C, and winter crops such as rapeseed, vegetables and green manure. The risk of freezing damage is small.
Recently, cold air activities in Jiangxi Province are frequent and the temperature is low. All localities should strengthen the prevention of adverse effects of low temperature, rain and snow and other disasters on agricultural production:
1. Vegetables and flower greenhouses will be patrolled and reinforced, and covered with film and straw sheds to enhance the insulation effect; poultry sheds will fill the gaps, laying hay, rice husk and other litter, and appropriately feeding corn and sorghum energy feed. To improve the ability of poultry to keep out the cold.
2. The young citrus orchard is covered with tree trunks or soiled and covered to reduce the freezing damage.
3. Clean the three ditches in the field crops and orchards, especially in the mountainous areas, to reduce the humidity in the field and prevent the water from freezing and increase the low temperature effect, and apply the hot fertilizer to enhance the cold resistance of the crop.
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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