15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
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Installation of parking system First of all, we should pay attention to the installation position of barriers and control machines, because the installation position is appropriate or not related to the user's convenience, generally we recommend that the distance between the barrier and the control machine is at least 2.5 meters. Because the distance may be too close, the owner may face the barrier gate when parking and swiping the card. It is recommended that the distance between the barrier and the controller should be about 3.5 meters. Second, the width of the parking lane is also an impact on the installation of the barrier and the control plane. Important factors, because the lane is too narrow will affect the smooth access of vehicles, so we recommend the width of about 4.5 meters; In addition, the current parking system will be installed surveillance cameras, surveillance cameras and barriers installed in the location also have a suitable distance Because the range of camera angles covers the position of the license plate when the vehicle reads a card, we generally recommend that the distance between the camera and the gate is about 1 meter; the size of the final post, the position of the deceleration zone, and the position of the control center are all among us. Some important factors to pay attention to when installing a parking system.
At present, the parking system is more and more widely used, such as commercial square toll parking, community parking, government agencies, airports, etc., but different use requirements will have different software and hardware requirements for the parking system, but no matter what kind of parking All installation requirements must be rigorous and detailed.
With the development of technology, the parking lot system is now moving towards the trend of becoming more networked, intelligent, and unmanned. Therefore, this requires the parking lot system to be of good quality and stable performance. However, if the parking lot system is installed improperly, it will also bring Come to some unnecessary trouble.