Selection steps and calculation methods of cylinder

Selection should be based on job requirements and conditions of the cylinder, the correct selection of the type of cylinder, the following in a single piston rod double-acting cylinder as an example to introduce the cylinder selection steps. ( ) Cylinder bore: according to the size of the cylinder load to determine the output force of cylinder, thus calculate the cylinder bore. ( ) Cylinder stroke: the cylinder stroke, related to the use situations and institutional schedule but do not generally choose full schedule. ( ) The strength and stability calculation of cylinder ( ) Cylinder type of installation: the installation of the cylinder form according to the installation location and the use of objective factors such as the decision. Under normal circumstances, the fixed cylinder. When need to work with agencies continuous rotary ( Such as the lathe, grinding machine, etc. ) , should choose the rotary cylinder. In the piston rod in addition to the linear motion, still need to make arc swing, choose shaft pin type cylinder. Have special requirements, should choose the corresponding special cylinder. ( ) Cylinder cushion device: according to the speed of the piston to decide whether should use the buffer device. 吗? ( ) Magnetic switch. When the pneumatic system adopts the electric control method, can be used with magnetic cylinder switch. ( ) Other requirements: such as cylinder work in harsh environments such as dust, need to install the dust cover on the piston rod out end, asked to choose when no pollution to oil or no oil lubrication cylinder. 。 Cylinder diameter to calculate the diameter of the cylinder should be design calculation based on load size, speed and system working pressure. First of all, according to actual working condition, cylinder installation and driven load analysis to calculate the actual load cylinder axial f, then selected by average speed of cylinder to cylinder load factor of theta, preliminary selected cylinder pressure ( As a general rule, be. mpa～. mpa) , the f/theta, calculate the output ft cylinder theory and finally calculate the diameter and stem diameter, and according to the actual required roundness with standard cylinder diameter and stem diameter. Sample cylinder drive on the workpiece in a horizontal guide rail movement. Known artifacts such as moving parts mass for m = kg, coefficient of friction between workpiece and guide =. , cylinder stroke s for mm, classics. S time workpiece movement in place, the system working pressure p =. Mpa, try selected cylinder diameter. Solution: actual axial load f = = mg cylinder. ××。 =. The average speed of sv = = n cylinder material mm/st. Theta equals the selected load rate. The output force f = f double-acting cylinder cylinder theory theory thrust theta equals. =. n。 F = PI dp cylinder diameter is selected according to the standard cylinder bore for mm. d =英尺×。 =≈。 mmπp. 。