The working principle of the chair lift and its use precautions

At present, the lifting device of the lift chair on the market is divided into three categories -- hydraulic, mechanical and pneumatic. In the low end of the chair lift to the air pressure of the majority. Pneumatic chair lift has a cylinder, the cylinder piston pneumatic rod up and down motion control chair lift, regular manufacturers are filled with nitrogen, the concentration is generally more than 99%, the pressure is about one or two atmospheres.

The lifting part has the following characteristics:

When you press the lift valve switch:

People sit on it, that is, to give the lifting shaft pressure, the lifting shaft will gently decline, uniform speed, can be reduced to the lowest point.

Do not give the lifting shaft external force, lifting shaft immediately spring back to the highest point, the speed is slightly faster, less than a second.

When not pressing (or releasing in the middle of pressing) the valve switch:

The lifting shaft is held in its current position, and compression and stretching cannot make it move relative to the outer sleeve.

First, consider the simpler freestyle gas spring:
The freestyle gas spring is simple and consists of three parts: a closed cylinder, a piston inside the cylinder, and a piston rod that extends out. The air pressure inside the cylinder is larger than that outside, and the piston inside the cylinder is connected with small holes on both sides. According to the knowledge of high school physics, if the piston rod is pressed inward, then the resistance is constant, is the difference between the two ends of the piston rod air pressure.

The self-locking type is a piston rod with a shaft inside. The inner end of the shaft is connected to a valve, which controls the connecting hole of the piston part. When the valve is pressed down the unicom hole has, equivalent to a freestyle; When the valve springs up without the connection hole, it will lock.

Here: the cylinder is our outer sleeve; The piston is our lifting shaft; The shaft in the piston is our valve pushbutton switch.

Therefore, for this kind of chair, the air pressure in the sleeve is basically constant when no one is sitting on it. (I don't know how many atmospheres there are in the cylinder. If the air pressure is large, it is actually a small grenade. But from the online case, metaphorically speaking, most of the grenade shell is stronger not burst, the grenade handle to top out).

Notes on the use of office chair lift

1, chair in use, do not repeatedly up and down;

2, if you are not a professional, do not disassemble the cylinder, and do not let the chair near too hot things, such as the oven or oven;

3, after a period of use, should be timely let the professional inspection, once found cracks, loose signs, should be timely maintenance and replacement.