The difference between the single-acting cylinder and double-acting cylinder

In practical application in the selection, we often encounter the single-acting cylinder and the selection of double-acting cylinder problem, what is the difference? Single-acting cylinder: a single-acting cylinder type spring pressure back ( As the SMC S type, see below 3 - 4) And the spring pressure type ( As the SMC T, see below 3 - 9) 。 S-shaped inlet port A, air pressure drive the pistons, overcome the spring force and friction force, the piston rod out; Port A exhaust, spring force make the piston rod. T is A mouth inlet, the piston rod back; A mouth exhaust, spring force make the piston rod out. In spring side is equipped with breathing holes R, breathing hole set on filter, in case of pollutants into the cylinder. Single-acting cylinder has simple structure, less gas consumption. Just installed the spring inside body, shortens the cylinder stroke. Spring of reaction increases with the increase of the compression stroke and, therefore, the output of the piston rod strength decreases with increasing of sports travel. Spring has the ability of absorbing kinetic energy, can reduce trip interruption knock-on effect. Generally used for short trips, to output force and speed requirement is not high. Double-acting cylinder: double-acting cylinder piston forward or backward can output force ( Push or pull) 。 Simple structure, can choose according to need. If without a buffer device, cylinder when the piston moves to the terminal, especially travel long cylinder, piston impact the strength of the end cover is very big, easily damaged parts. Double-acting cylinder can also be divided into single rod and double rod ( See below 3 - 7) 。 Double piston rod compression area on either side of the cylinder piston is equal, moving distance and output force are equal on both sides. Can be used for long stroke the workbench of the device. Fixed on both ends of the piston rod, cylinder of the cylinder with the workbench movement, enhance the rigidity, good guidance. In order to absorb the trip end of cylinder movement can impact, on both sides of the piston has a cushion, in order to protect the cylinders from damage.