1.introduction; Chuck is used for clamping workpieces on machine tool mechanical device.Using uniform in jaw chuck body on the activity of radial movement, the workpiece clamping and positioning of the machine tool accessories.Chuck is usually mounted on a lathe, cylindrical grinder and internal grinder, can also be used with different dividing device, used for milling and drilling.
2.classification: count from chuck claw can be divided into: two jaw chuck, three jaw chuck, four jaw chuck, six jaw chuck and special chuck.From the use of power can be divided into: Manual Chuck, pneumatic chuck, hydraulic chuck, electric and mechanical chuck chuck.From the structure can be divided into: hollow chuck and implementing chuck
Our company main produce K11series 3 jaw self-centring chucks and K72series 4 jawindependent chucks
1) Three Jaw Chucks : using uniform on the chuck body three jaw radial movement, the workpiece clamping and positioning of the machine tool accessoriesUse voltaic spanner rotating bevel gear, bevel gear drive plane rectangular thread, and then the three claw centripetal movement, because the plane rectangular thread pitch is equal, so three jaw movement distance is equal, have the effect of the automatic centering.
2) four jaw chucks :With four screw drive respectively four claws, so common four jaw chuck no self-centering effect.The commonly used four jaw chuck, is composed of a plate body, four screw, consisting of a pair of jaw.Work is respectively with four screw drive four claws, four claw is only one single jaw chuck card whole claw.
Manual Chuck,Lathe Chuck,Lathe Chuck Jaws,Mini Lathe Chuck NingXia DaHe Machine Tool (Group) Imp And Exp Co.,Ltd , https://www.nxdhjcmachine.com
Xi'an Jiaotong University develops high-coulombic efficiency silicon negative lithium battery
Recently, Zheng Xiaoquan, a professor at the School of Electrical Engineering of Xi'an Jiaotong University, and Cui Wei, a professor at the School of Materials Science at Stanford University, and Li Ju, a professor at the Department of Nuclear Engineering at the Massachusetts Institute of Technology, worked together to coat the outer surface of the nano-silicon anode through a special method. The artificial titanium dioxide nano-layer is used to synthesize a silicon-structure negative electrode with high mechanical strength, and a silicon negative electrode full-battery with high-pressure real density is prepared, which realizes twice the volume specific capacity and twice the mass specific capacity of the conventional graphite negative electrode.
At present, commercial lithium-ion batteries are only used for low-order power requirements, and silicon is expected to be a large-capacity anode material for next-generation lithium-ion batteries because its theoretical specific capacity is more than 10 times that of conventional graphite anodes. However, the problem of low coulombic efficiency of the silicon negative electrode during charge and discharge has not been overcome.
After experimental testing, the new result of the titanium dioxide shell mechanical strength is five times that of amorphous carbon, can achieve a stable Coulomb efficiency of more than 99.9%, to meet the industrial application standards, will effectively promote the commercial bulk of silicon in the battery industry application. The results were recently published in the Energy and Environmental Science. (Zhonghe)
Germany develops new sensor technology to reduce lithium battery weight and cost
German engineers have developed new sensor technologies that can reduce the weight and cost of electric vehicles and other types of lithium-ion batteries.
Philippe Dotst is a member of Ruhr University's Power Systems Technology and Electrical Mechatronics research team, which developed a new concept for monitoring battery current and voltage, reducing the battery's technical burden, and adding New features.
Typically, an electric vehicle battery consists of a single battery that can contain up to 12 batteries, each battery being monitored by its own voltage sensor. Sensors are important for monitoring lithium batteries in batteries, and if they are overheated or overworked, they may burn.
In a typical electric vehicle battery, there is a current sensor and multiple voltage sensors to do the job, and the sensor is a considerable weight and cost driver.
To reduce weight, Dost and his colleagues proposed a way to reduce the number of sensors that previously required electric vehicle batteries to monitor current and voltage, regardless of how many cells are in the battery.
Researchers say the sensor system they developed can be extended to batteries with different cell counts. It can also be applied to other battery types such as tablets or laptops, wireless power tools, uninterruptible power systems and solar energy storage systems to reduce their weight and cost and increase battery life.
Next, Ruhr University engineers will continue to work to improve the technology, more closely evaluate their prototypes and replace individual components to meet the requirements of the automotive industry.