A screwdriver is a tool, manual or powered, used for screwing (installing) and unscrewing (removing) screws.
A typical simple screwdriver has a handle and a shaft, ending in a tip
the user puts into the screw head before turning the handle. This form
of the screwdriver has been replaced in many workplaces and homes with a
more modern and versatile tool, a power drill,
as they are quicker, easier, and also can drill holes. The shaft is
usually made of tough steel to resist bending or twisting. The tip may
be hardened to resist wear, treated with a dark tip coating for improved
visual contrast between tip and screw-or ridged or treated for
additional 'grip'. Handles are typically wood, metal, or plastic[1] and
usually hexagonal, square, or oval in cross-section to improve grip and
prevent the tool from rolling when set down. Some manual screwdrivers
have interchangeable tips that fit into a socket on the end of the shaft
and are held in mechanically or magnetically. These often have a hollow
handle that contains various types and sizes of tips, and a reversible ratchet action that allows multiple full turns without repositioning the tip or the user's hand.
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Jiangsu Xingrong High-tech Co., Ltd. recently stated that its copper-aluminum composite pipe (ACC pipe) produced by patent technology can improve product energy efficiency. The product is a copper-clad aluminum structure, which utilizes the good thermal conductivity of copper and the good specific heat value of aluminum to increase the heat transfer rate. According to reports, Xingrong has successfully achieved metallurgical bonding between copper and aluminum using patented technology. The light pipe used in air conditioning condenser can achieve the same heat transfer effect as the internally threaded copper pipe. When both machines use the internal thread ACC tube, the energy efficiency ratio is 5% higher than that of the internal thread copper tube; each air conditioner reduces the cost by about 150 yuan, which is the replacement of the air conditioning tube.
Copper-aluminum composite pipe is mainly used in air conditioner evaporators and condensers, refrigerator condensers and evaporators, refrigerator connecting pipes, central air conditioners, fan coils, water heater pipes, heating radiators, water pipes and the like.
According to the data provided by Xingrong Company, the tensile strength of copper-aluminum composite pipe is 110-130MPa, the bursting pressure is above 18MPa, and the flare ratio can reach 40%-50%. The inner surface cleanliness, flattening, bending and anti-wear Leakage and other indicators fully meet the requirements of air conditioning pipe standards. The tube area copper area ratio is 12% to 14%, the weight ratio is 31% to 38%, and the normal specific gravity is 3.45g/cm3. The main specifications of the two tubes are: φ9.520.5mm, φ7.940.5mm; φ70.5mm.