From April 8th to April 17th, 2018, Xinjiang Bozhitong Company organized a six-day Siemens S7-300/400 PLC and four-days drive training in Yichang, Hubei Province for the needs of a number of companies. The technical staff of 19 companies from the power, chemical, mining, port, aerospace, medical, automobile manufacturing, and food industries participated in the training. The Siemens S7-300/400 PLC speaker is a teacher who specializes in the development and design and training of electrical automation projects. Teacher Fan once worked for some domestic and international well-known enterprises to upgrade automation equipment and technical training, and has accumulated a wealth of field experience and teaching experience. Very familiar with high and low voltage systems and plant equipment. Teacher Fan has a strong affinity and can quickly communicate with students. Seizing weak points of students and teaching them in a targeted manner greatly stimulated their enthusiasm for learning. The student's staff worked on a computer and practiced programming with the teacher. Through six-day, one-on-one simultaneous training, the trainees not only learned the basic knowledge of PLC, but also systematically studied the hardware, software, and programming of the PLC. In the course of training, Teacher Fan combined with practical project case-specific programming exercises, from shallow to deep. Through practical operation, the practical ability of the trainees has been improved and the students have learned the most valuable knowledge in a short period of time. Zhang Gong of the Yellow River Xinye Co., Ltd. said: "We have used the desulfurization technology in the production process because of its high corrosivity. The AI ​​and AO modules often fail. After I finish learning, I can solve the fault by myself and I don't need to replace the module completely. The trainees are very interested in this very practical training. Because many of the programs our teacher has compiled in class can be applied directly to the project. In practice, through the programming cable, Ethernet connection PLC. Data block upload and download and save. The trainees mastered how to operate the PLC software, debug uploaded and downloaded programs, and understood the relationship between PLC logic operations. The training reflected a good rate of 97.5% and the training was successfully completed. Inverter training lecturer is Wang Zhaoyi, a teacher who has been engaged in the application and maintenance of frequency converter for more than 30 years. Wang has published many books on electrician technology. Our curriculum theory is combined with Wang's deep technical guidance. Teachers in the classroom are vocal, lectures are meticulous, patiently, and demonstrate again and again. The principle is explained carefully and thoroughly. 70%-80% of problems in the field work are theoretical problems, not technical problems. Failure to understand the problem is due to imprecise theory. In the course of our communication with the students, the students said that the course can understand people who have no relevant foundation. The theoretical foundation is explained very well. After the end of the course, the satisfaction rate of the trainees of all units on our training reached 94%.
Classified from the finished structure of the valve, it is usually divided into a whole valve, a double metal butt welding valve and a hollow sodium filling valve.The additional process is usually top soldering, top surfacing, cone surfacing, surface nitriding, surface chrome plating, and the like.The valve is an important part of the engine. The function of the valve is to specifically input air into the engine and exhaust the burned exhaust gas.
From the structure of the engine, it is divided into an intake valve and an Exhaust Valve. The function of the intake valve is to draw air into the engine and mix and burn with the fuel; the function of the exhaust valve is to discharge and dissipate the burned exhaust gas.
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