The speed of the cylinder

The piston in the process of the whole movement, the speed is changing. The maximum speed known as the maximum speed, remember to um. For the gas buffer cylinder, maximum speed is usually in the end of the trip. For air cushion cylinder, maximum speed usually before entering the buffer stroke position. Cylinder without external load, and assume the cylinder exhaust exhaust side of sound, and the air pressure is too low, not out of cylinder speed known as the theory reference. U = * S/A, u for theory reference speed S exhaust circuit synthesis effective cross-sectional area A is the cross-sectional area of the exhaust side of the piston. Theory speed with no load when the maximum speed of cylinder is very close, so that no load when the maximum speed of cylinder is equal to the u. 。 As the load increased, the maximum speed of cylinder um will decrease. Cylinder cylinder is the average velocity of the moving distance divided by the action of cylinder time L ( Usually calculated at time of arrival) t。 As the speed of cylinder is refers to the average velocity. When a rough calculation, the maximum speed of cylinder general average speed. Times. The use of standard cylinder speed range is mostly - mm/s. When the speed is less than the mm/s, due to the influence of the cylinder friction resistance increases, and the compressibility of the gas, can not guarantee the piston make smooth movement, will appear the phenomenon of the park when, referred to as the 'crawl'. When the speed is higher than the mm/s, cylinder seal friction heat production, accelerate the seal wear, cause leakage, shorten the life, also will increase, the impact of the end of the trip affect the mechanical life. To cylinder work under low velocity, appropriate use of gas-liquid damping cylinder, or through the converter gas and liquid, the use of gas-liquid combination cylinder for low speed control. To work under a high-speed, need to lengthen the length of the cylinder and improve the machining precision of cylinder tube, improve the sealing ring material to reduce the friction resistance, improve the buffering performance, etc.