Lifting desk and chair parameters: 1. Student desks and chairs Specifications: 600*400*640-760mm(±5mm) (1) Panel 1. Made of 600*400*18mm thick desktop material, using E1 grade 18MM environmentally friendly density board and environmentally friendly PP plastic integrated injection molding. The table top is oak colored, with a pen slot on the tabletop, completely free of burrs around and bottom, and does not contain heavy metals or other toxic and harmful substances. (2) Bookcase 1. Material: cold-tied steel 0.8 mm thick, stamped and formed by large-scale mechanical hot pressing; 2. Inner diameter size: 450*300*130mm. 3. Function: table bucket, beautiful and generous, sturdy and durable. (3) Table frame 1. Material and structure: oval steel pipe, casing type lifting. 2. Size: The size of the steel pipe at the foot of the table is 25*20*1.2mm elliptical tube, the outer vertical pipe is 25*50*1.2mm elliptical tube, the casing is 20*40*1.2mm elliptical tube, and the iron hook hanging piece at one end is set with a hook, the static load bearing is more than 5kg, and the size of the foot cross tube is: 25*50*1.2mm elliptical pipe; 3. Lifting structure: using casing type lifting, the lifting is completed by two-point screws to complete the height adjustment. The lifting is flexible and the operation is simple and convenient. 4. Surface coating: the welded steel pipe frame, the surface is made of first-class particle powder, electrostatic spraying through the assembly line, high-temperature powder paint, strong adhesion, no paint peeling; (4) Foot pads: using PP plus fiber plastic integrated injection molding; The self-locking foot cover will never fall off. 2. Student chair specifications: 420*400*360-440mm (±10mm) (1) Seat board: 1. Material: high-density polyethylene plastic particles, through modification and integrated injection molding, anti-aging, wear-resistant and stamping, completely burr around and bottom, smooth and safe to meet environmental protection requirements, add plastic color powder, absolutely do not contain heavy metals and other toxic and harmful substances, provide plastic plate anti-aging certificate. 2. Size: Seat 420*400mm (±10mm); 3. Function: The front end of the seat cushion has two concave designs, which can make the legs fit the seat cushion when sitting, reduce the pressure of sitting for a long time, and the cushion has a hook design, which has a strengthening effect, and the hook width is less than 5mm, which meets the national safety standards. (3) Chair steel structure: 1. Material and shape: oval steel pipe; It is made of CO2 full welding; 2. Steel pipe material: the size of the steel pipe at the foot of the chair is 25*50*1.2mm oval tube, the outer pipe is 25*50*1.2mm oval tube, the casing is 20*40*1.2mm oval tube, the size of the foot cross tube is: 25*50*1.2mm oval tube, the steel pipe size of the welded backrest bracket at one end of the casing: 20*40*1.2mm The oval pipe is fixed with the connecting screws of the seat backrest; 3. Lifting structure: using casing type lifting, the lifting is completed by two-point screws to complete the height adjustment. The lifting is flexible and the operation is simple and convenient. 4. Surface coating: After the welding of the steel pipe frame is completed, the surface is made of first-class particle powder, electrostatic spraying by the assembly line, and high-temperature powder baking paint, with strong adhesion and no paint peeling. (4) Foot pads: using PP plus fiber plastic integrated injection molding; The self-locking foot cover will never fall off. The product quality assurance meets national standards and environmental protection requirements, with a solid structure, not easy to shake, and beautiful and generous. The surface material has no toxic side effects and no peculiar smell, ensuring the physical and mental health of users.