Business office pressure chair lift working principle
At present, lifting devices used in the market are divided into three categories - hydraulic, mechanical and pneumatic. In the low-end chair lift to the majority of pressure. Air pressure chair lift has a cylinder, pneumatic piston rod in the cylinder up and down movement chair up and down, regular manufacturers are filled with nitrogen, the concentration is generally above 99%, the pressure at about one or two atmospheric pressure.
The lifting part has the following features:
Press the lift valve switch:
People sit up, that is, to the lifting shaft pressure, the lifting shaft to gently drop, the speed is uniform, can be reduced to the lowest point. Not to lift the shaft force, the lift shaft immediately bounced back to the highest point, slightly faster, less than a second.
Do not press (or press halfway release) when the valve switch:
The lift shaft remains in its current position and neither compression nor extension will allow it to move relative to the outer sleeve.
First of all, understand the simpler freestyle gas spring:
Freestyle gas spring is relatively simple, consists of three components: a closed cylinder, piston in the cylinder, extending to the outside of the piston rod. The pressure inside the cylinder is larger than the outside atmospheric pressure, the piston inside the cylinder has holes on both sides connected. According to the physics of secondary school, if the piston rod is pressed in, then the resistance is constant, that is, the difference between the air pressures at both ends of the piston rod.
Self-locking type is a free-style piston rod which added a shaft inside the shaft attached to the other end of the valve, the valve to control the piston part of the communication hole. When the valve is pressed Unicom hole, equivalent to a freestyle; when the valve bounced Unicom hole no, it will lock.
Here: The cylinder is our outer sleeve; the piston is our lifting axis; the shaft in the piston is our valve button switch.
Therefore, for such a chair, the pressure in the sleeve is substantially constant when not in the seat (it is not known if there are several atmospheres in the cylinder, and if the pressure is large, it is actually a small grenade.) However, from the online case Look, metaphor, most of the grenade shell is not more solid burst, the grenade to the top out).