1, made of high-quality cold-rolled steel plate, with a wall thickness of 1.2 mm, 6 floors in total and a height of 300 mm The bookshelf is made of vertical columns and underframe jacks, and the bookshelf is divided into two parts with a bookstop in the middle.

2. The load capacity is 80kg/floor. After 24 hours, the maximum deflection is less than 3 mm, the residual deformation after unloading is less than 0.3 mm, and there is no permanent deformation and plastic layer falling off. The load-bearing column is a compound double column, and the thickness of the load-bearing side of the laminated plate is 25 mm, so that the load of each shelf is reduced by three bends.