Recently, the research team of Qiao Shushan, an associate researcher at the Center for Intelligent Perception of the Institute of Microelectronics of the Chinese Academy of Sciences, has achieved a number of breakthrough scientific research results in the research of power line carrier communication technology applied to the smart grid, and developed several power line carrier communication chips in the smart grid. Information acquisition system is widely used.
The power line carrier communication technology is to realize the communication interconnection among the nodes of the network through the existing low-voltage power transmission network. The technology does not require the laying of dedicated lines, which has the advantages of low communication costs, good confidentiality, and wide coverage. However, the power network has large time-frequency noise, strong attenuation, and large impedance variation, which brings great challenges to communication reliability. The research team conducted in-depth and extensive research on this challenge, established a transmission characteristic model of power line network noise, attenuation, and impedance change, and advanced advanced SFOFDM modulation and demodulation technologies, impulse noise interference suppression technology based on compressed sensing theory, The hierarchical synchronization technology greatly reduces the probability of false alarms and false alarms. It monitors multi-dimensional transmission characteristics of channels in real time through multi-dimensional dynamic channel prediction technology and completes multiple series of standards, algorithms, chips, networking, and application solutions. Article, applied for 14 patents.
Based on the above results, the team developed a variety of power line carrier communication chips, featuring high sensitivity, high speed, and high integration. This series of chips also possesses functional modules such as phase detection, carrier signal strength detection, and noise suppression, and supports software carrier on-line upgrade function, which greatly improves the communication reliability. It has been mass-produced by a cooperative industrialization company. At present, the module has obtained the national grid network qualification, the cumulative use of 700,000, module output value of about 30 million yuan.
The elevator guide shoe
Elevator guide shoe is a sliding part between elevator guide rail and car, what we call it guide shoe. It can fix the car on the guide rail and make car running up and down. Oil cup upper the elevator guide shoe that can reduce the friction of the shoe line and guide rail. There are four sets of guide shoes installed in each unit, respectively on both sides of the upper beam and under the safety clamp seat at the bottom of the car; and also four sets counter weight guide shoes are mounted on the bottom and top of the beam.
The guide shoes fixed on the car can move up and down along the fixed guide rail installed on the wall of the well way of the building to prevent the car from deviating or swinging in operation.
Guide shoe installation requirements
The installation method of guide shoe is to put it on the installation position of the guide rail of the car frame. After finding the right position, use the bolt fix it on the car guide rail frame. The installation must meet the following requirements:
- When the upper and lower guide shoes are installed in the right position, they should be on the same vertical line. No slant or deflection is allowed. Both roller guide shoes and fixed guide shoes same requirement.
- Fixed guide shoes are mainly used for FOVF units, the clearance between the two sides should be consistent, and the clearance between the inner lining and the rail top should be within O. 5 ~ 2 mm
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