National standard size of middle school desks

The basic size of a desk is to make an iron desk. The desk is 760mm high, 65mm long and 450mm wide. The wall thickness of steel plate is+1.0mm, and the thickness of other eccentric pipes and steel pipes is+1.2mm.. ..

1, desks and chairs, English names are desks and chairs, which are used by students in class, also called student desks and chairs. Tables and chairs can be divided according to age, material and function.

2. According to age groups: desks and chairs in kindergartens, desks and chairs for primary school students, desks and chairs for middle school students and desks and chairs for college students; According to the function: divided into fixed tables and chairs and lifting tables and chairs; According to materials: wooden tables and chairs, plastic tables and chairs, steel tables and chairs.

3. The assembly work completed by a worker or a group of workers without changing the equipment or place is called the assembly work completed by using the same tool and auxiliary tools without changing the working method, and it is called the working step. The assembly process may include one or more assembly steps. General assembly and component assembly consist of several assembly processes. As far as product composition is concerned, parts are the smallest unit that constitutes a product. When several parts are combined into one part, it becomes a part of the product. No matter how they are combined, they are collectively called parts.

4. You'd better choose a company with the following qualifications to buy desks and chairs: a company that has passed the environmental protection certification (ISO14001-2004+0-2004). Units that have passed the national compulsory safety certification (3C certification). Don't just look at the price and pictures. Manufacturers do things according to their conscience. They only buy the wrong things, not sell them. Some merchants use recycled materials or defective products instead of raw materials, or the amount of raw materials for the same thing is small. Try to choose a company with good reputation and full qualifications to buy. When buying tables and chairs, quality and safety are the first.

Schools in China have been using traditional miscellaneous wood to make tables and chairs. Since 1980s, the eastern coastal areas began to learn from foreign experience, and made tables and chairs by combining steel and wood instead of wood. Although steel-wood tables and chairs have been produced by mechanical methods after more than 20 years of development, they can't completely replace the first generation tables and chairs at present because of many shortcomings such as loose nails, easy rusting and short service life. In rural schools in most parts of the central and western regions, most students are still using the first generation of desks and chairs made of miscellaneous wood. The fact that it has been used for many years also proves that the quality of students' desks and chairs made of steel and wood is not much better than the first generation of wooden desks and chairs recognized by the education sector. Therefore, although the development time is as long as more than 20 years, the development speed is very slow, and it can only be used as a transitional product to replace the first generation of tables and chairs. With the rapid development of science and technology, the materials used for doors and windows of high-rise buildings in foreign developed countries have gone through three stages: "wood-iron-aluminum alloy", and hard plastics began to replace aluminum alloy more than 10 years ago. In recent years, scientists and technicians have designed a large number of plastic steel parts to replace wood, iron, aluminum and other parts on automobiles, trains, ships and airplanes, and their functions are far superior to the former. Replacing wood, steel and aluminum with plastics is an inevitable trend of scientific and technological progress, and it is also the only way for the development of China's manufacturing industry in the future, and tables and chairs are no exception. Moreover, the future desks and chairs can not only be adjusted in height, but also be connected with desks and chairs, consisting of desks with adjustable height and connecting plates with adjustable spacing. It solves the problem that the existing desks and chairs for primary and middle school students can't adjust the height of desks and chairs and the distance between desks and chairs. It is suitable for students of all grades and shapes in spring and autumn, and can be adjusted according to each student's personal situation, which fully meets the hygiene standards of desks and chairs.