Views:90 Author:Site Editor Publish Time: 2021-08-27 Origin:Site
Lifting desks and chairs are desks and chairs that can be adjusted in height. Generally, it is mainly used in schools or homes. According to the screws of the desk legs, the flower shafts are fixed to slide up and down and fixed to meet the requirements of students and schools. So what is the principle of lifting desks and chairs? Let me take a look at it below.
The pneumatic lift chair is a new type of chair. There is an air cylinder inside the lift chair. The piston rod in the cylinder moves up and down to control the lifting of the swivel chair. The gas pressure rod is filled with nitrogen. Generally, the purity of the gas is lower than 90%, which may cause safety hazards. Insufficient sealing of the pressure rod may also cause the gas to burst. In addition, the material of the pneumatic rod itself is also very important, and if an unqualified material is used, an explosion may occur.
The reason why it can be raised and lowered is because there is a pneumatic rod in the lifting device. The pneumatic rod is an elastic element that uses gas and liquid as the working medium and can play support, buffer, brake, height adjustment and angle adjustment functions. The basic principle is that the inside is filled with high-pressure nitrogen. Because of the through hole inside the piston, the gas pressure at both ends of the piston is equal.
The cross-sectional area of the two sides of the piston is different, one end is connected with a piston rod and the other end is not. Under the action of the gas pressure, the pressure to the side with the smaller cross-sectional area is generated, that is, the elastic force of the pneumatic rod. When a person sits up and puts pressure on the lifting shaft, the lifting shaft descends gently, with uniform speed, and can be lowered to the lowest point. No external force is applied to the lifting shaft, and the lifting shaft rises to the highest point.
This kind of gas spring can stop at any position in the stroke with the help of a release device, and has a great locking force after stopping (can reach more than 10000N).
The hydraulic jack of the key part of the hydraulic chair lift is driven by the manpower to drive the hydraulic pump, which is driven by the hydraulic system, and the cylinder or piston is used as the lifting member. Hydraulic jacks can be divided into integral type and separate type. The integral pump is connected with the hydraulic cylinder into a whole; the separate pump is separated from the hydraulic cylinder, and the middle is connected with a high-pressure hose. The hydraulic jack has a compact structure, can lift heavy objects steadily, and has a high transmission efficiency, so it is widely used.
But it is easy to leak oil, and it is not suidesk to support heavy objects for a long time. If self-locking jacks are required for long-term support, screw jacks and hydraulic jacks can be made into multi-stage telescopic types to further reduce the profile height or increase the lifting distance.
The relevant information about lifting desks and chairs is here for everyone. I hope this article will be helpful to you. If you still don’t understand, you can follow us.