How to choose the appropriate pneumatic cylinder?

July 30, 2024

1. The magnitude of the force

That is to say, choose the diameter of the cylindrical tube. Determine the thrust and tension output of the cylinder based on the magnitude of the load force. Usually, the cylinder force required for external load theoretical balance conditions is selected, and different load rates are chosen according to different speeds to provide some margin for the output force of the cylinder. If the cylinder diameter is too small, the output force will be insufficient, but if the cylinder diameter is too large, the equipment will be bulky, the cost will increase, air consumption will increase, and energy will be wasted. In the design of fixtures, force expansion mechanisms should be used as much as possible to reduce the overall size of the pneumatic cylinder.

2. Select model

Choose the correct cylinder type based on job requirements and conditions. If there is no impact phenomenon or impact noise when the cylinder reaches the end of the stroke, a buffer cylinder should be selected; If lightweight is required, a lightweight cylinder should be chosen; If narrow installation space and short stroke are required, thin cylinders can be chosen; If there is a lateral load, a guide rod cylinder can be selected; In order to achieve high braking accuracy, a locking cylinder should be selected; If the piston rod is not allowed to rotate, a cylinder with rod non rotation function can be selected; Heat resistant cylinders should be selected in high-temperature environments; Corrosion resistant gas cylinders should be selected in corrosive environments. It is necessary to install a dust cover on the extended end of the piston rod in harsh environments such as dust. When pollution is not required, oil-free or oil-free lubricated cylinders should be selected.

3. Determine the piston stroke

It is related to the usage scenario and the stroke of the mechanism, but full stroke is usually not chosen to prevent collision between the piston and cylinder head. If used for clamping mechanisms, an additional margin of 10 to 20 millimeters should be added based on the calculated stroke.Pneumatic cylinder barrel.WEIYINGSI

4. Installation form

This depends on the installation location, usage purpose, and other factors. Generally speaking, a fixed cylinder is used. When continuous rotation of a working mechanism (such as a lathe, grinder, etc.) is required, a rotary cylinder should be selected. When the piston rod needs to swing along a circular arc in addition to linear motion, a pin type cylinder is used. When there are special requirements, the corresponding dedicated cylinder should be selected.

5. Piston speed

It mainly depends on the input compressed air flow rate of the cylinder, the size of the intake and exhaust ports of the cylinder, and the size of the inner diameter of the duct. High speed movement requires larger values. The movement speed of the cylinder is generally 50-800mm/s. For high-speed cylinders, a larger inner diameter intake pipe should be selected; For changes in load, in order to achieve slow and stable motion speed, throttling devices or gas-liquid damping cylinders can be selected, which makes speed control easier to achieve. When choosing a throttle valve to control the speed of the cylinder, it should be noted that when a horizontally installed cylinder pushes the load, it is recommended to use an exhaust throttle valve to adjust the speed; When the vertically installed cylinder lifts the load, it is recommended to use an intake throttle valve to adjust the speed; At the end of the journey, it is necessary to move steadily. When avoiding impact, a cylinder with a buffer device should be used.WEIYINGSI Pneumatic Cylinder Tube.