In recent years, the phenomenon of myopia in primary and secondary school students has become more common. It is understood that the incidence of myopia in primary and middle school students in Ningbo reached 90.5% in 2014, and increased by 1.5 percentage points per year in the past two years. Most of the students can spend the day in the classroom, but after investigation, the existing 540,000 primary and secondary schools in the country use the light source and lighting environment in the classroom. On July 22, the Ministry of Educationâ€™s educational equipment research and Relevant personnel from the Development Center and experts and scholars from the lighting academic circles arrived at the survey, which opened the prelude to the development of lighting standards for healthy classrooms for primary and secondary school students across the country. In recent years, the phenomenon of myopia in primary and secondary school students has become more common. It is understood that the incidence of myopia in primary and middle school students in Ningbo reached 90.5% in 2014, and increased by 1.5 percentage points per year in the past two years. Most of the students can spend the day in the classroom, but after investigation, among the 540,000 primary and secondary schools in the country, the light source and lighting environment used in the classroom are mixed, and it is imperative to create a healthy classroom lighting environment for the children. Row. Last year, Ningbo enterprises took the lead in proposing the development of uniform standards, with health as the first requirement for classroom lighting environment. In January of this year, Ningbo Kaiyao Lighting Co., Ltd. participated in the formulation of "CQC3155-2016" and "Technical Specifications for Energy-saving Certification of Lighting Products for Primary and Secondary Schools and Kindergartens". Combined with the current state of technology and application, the "Specifications" refines the parameters such as output power, illumination, uniformity, and glare value of classroom lighting sources. Before the introduction of this standard, most LEDs did not dare to use LEDs as classroom lighting sources because LEDs may have blue light hazards. Xia Hongxiang, vice president of Ningbo Effect Middle School, told the author: There are 58 ordinary classrooms and 32 dedicated classrooms in our school. Currently, T5 fluorescent tubes are used. We have been concerned that LED blue light will cause damage to students' retina. The research results of authoritative institutions such as the Institute of Electric Light Sources of Fudan University show that the effects of blue light hazard and blue-rich lighting are not unique to LED lighting products, and some fluorescent lamps with unqualified quality may also exist. Therefore, Shen Yingqi, Director of the School Logistics Equipment Division of the Education Equipment Research and Development Center of the Ministry of Education, pointed out that it is imperative to promote the formulation and implementation of standards. Whether LED or fluorescent, only meet the standards to enter the classroom, so as to create a truly healthy lighting for children. surroundings. At present, Ningbo Kaiyao Lighting Co., Ltd. has built a standard classroom for LED health lighting, which uses LED light sources. After testing, experts have approved indicators such as illuminance, brightness, and uniformity. It is reported that in the next step, Kaiyao will cooperate with the primary and secondary schools in our city to build a number of pilot classrooms.
This series of permanent-magnet synchronous gearless traction machines is directly driven by a low-speed, high-torque, 3-phase permanent magnet synchronous motor, and has the advantages of low energy consumption, low noises, no pollution, and little maintenance.
By using flat frame structure with three mounting surfaces, this series of traction machines can be installed on bottom floor or any middle positions or on the top of shaft way.
These traction machines can be arranged for providing upward traction or downward traction, and have remote manual brake release function. Wrap angle of the traction machines can be only 180Â°.
Standard Gearless Traction Elevator, Gearless Elevator Traction Machine, Gearless Elevator Machine, Gearless Traction Motor
Gearless Traction Machine
Gearless Traction Machine,Gearless Traction Elevator, Gearless Elevator Traction Machine, Gearless Elevator Machine, Gearless Traction Motor
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