Going out, the most worrying thing is that no one at home, the thief broke into the house and stole valuables and large sums of cash. When people go to work outside, they lose their keys accidentally, and they can't go back home. These are the hard-won problems of torture. The door is the first safety line in the home, and the importance is self-evident. At present, there are three types of door locks on the market, namely mechanical electronic locks, smart locks and cloud smart locks. In contrast, cloud smart locks are used with mobile phones, which are not only durable but also able to be directed to the owner at the first time of being illegally dialed. The mobile phone sends out an alarm signal to inform the owner of the timely alarm to prevent the crime from happening, which is called the protection of the family. Electronic lock upgrade to smart lock It is said that the lock is an ancient industry, which has been developed for thousands of years. From the past "Iron General" to the mechanical lock of the door to the modern electronic locks, including the locks in the high-rise buildings, the lock industry is booming. The annual sales of the locks for the year is up to 22 Billion. The annual sales of the domestic lock industry is as high as 40 billion yuan, the production capacity is over 2 billion sets, and the annual export volume exceeds 10 billion yuan. It is reported that in the future, China's lock market will continue to grow at a rate of more than 20% per year. As the living standards of the people improve, not only do they need to eat and wear warm, but also pursue cultural spirit, and also put forward new requirements for life and property safety. In addition to high-quality security doors, it is also necessary to equip an efficient and safe door lock. Previously used mechanical lock electronic locks, it seems to be sturdy and durable, but as the thief opens the door technology, the door locks appear to be weak and ineffective. Shandong, Anhui and other places have repeatedly reported that the gangsters can unlock more than 10 seconds, and they are chilling. Old-fashioned smart locks have mixed pros and cons When the smart door lock came into being, people thought that there was a savior and they could sneak out the door. Smart locks are different from traditional mechanical locks and are more intelligent in terms of user identification, security, and management. The system will automatically lock when the door is automatically closed. The smart lock can unlock the door through the fingerprint, touch screen and card. At present, the most common smart locks on the market are mainly fingerprint locks, but fingerprint locks are inconvenient when using password/fingerprint registration functions, and there is a danger of password leakage. For example, when a company punches a card, employees use fingerprints to clone fingerprints instead of punching cards. In the past, acquaintances have stolen fingerprints of colleagues and stolen the property of others, causing adverse social impact. It seems that the smart door locks that are placed on high hopes are not invulnerable. It is really a foot high and the thief is one foot high. IOT cloud smart lock into a security guard Since thieves use technology to open the door lock, they use a high-tech door lock to recast a safe and reliable iron gate to protect the owner's life and property. Smart home locks led by Smart Home, the smart lock of the latest generation of high-tech locks, with the solid and durable mechanical locks, smart and convenient smart door locks, and the use of smart homes to build a security net. Originally, the cloud smart lock is not only an ordinary smart door lock, but also adopts zinc alloy integrated die-casting structure, which is firm and strong, durable, and the surface is treated by vacuum nano technology. The hardness is high, the wear resistance is better, and the coating bonding strength is higher. It can be used with the security door alone, and has a sensor function. With a wireless gateway, it forms a complete family Internet of Things access control system, which is directly connected to the user's intelligent mobile terminal. The person in charge of the IoT Sensing Marketing Department said that if a gangster uses all means to dial the cloud smart lock, the lock can send an alarm message to the owner's mobile phone, and the owner will immediately call the police to stop the crime. If the phone is lost, the user does not have to worry about the door being opened, because the door must be equipped with a password set by the user. In addition, if a guest visits, if the owner is outside, you can also remotely open the door by mobile phone to let the guest stay in the advanced room. Petroleum Coke is the solid non-volatile carbon residue left after the distillation and cracking of petroleum. Petroleum coke is mainly used in the manufacture of ultra-high power graphite electrodes and some special carbon products. Petroleum coke consists mainly of carbon, sometimes with a small amount of hydrogen, nitrogen, sulfur, oxygen and certain metals, sometimes with water. 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