Pneumatic Cylinder Selection

1. The size of the force
That is, the choice of cylinder tube diameter. According to the size of the load force, the thrust and pull force output by the pneumatic cylinder are determined. Generally, the cylinder force required by the theoretical balance condition of the external load is selected, and different load rates are selected according to different speeds, so that the output force of the cylinder has a little margin. If the cylinder diameter is too small, the output force is not enough, but if the cylinder diameter is too large, the equipment is bulky, the cost is increased, the air consumption is increased, and the energy is wasted. In the design of the fixture, the force expansion mechanism should be used as much as possible to reduce the overall size of the cylinder.

2, the choice of type
Correctly select the type of cylinder according to the working requirements and conditions. If the cylinder is required to reach the stroke end without impact phenomenon and impact noise, a buffer cylinder should be selected; if light weight is required, a light cylinder should be selected; if a narrow installation space and a short stroke are required, a thin cylinder can be selected; if there is lateral load, a guide rod cylinder can be selected; For high braking accuracy, a locking cylinder should be selected; if the piston rod is not allowed to rotate, a cylinder with the rod non-rotation function can be selected; a heat-resistant cylinder should be selected in a high temperature environment; a corrosion-resistant cylinder should be selected in a corrosive environment. In harsh environments such as dust, it is necessary to install a dust cover at the extended end of the piston rod. When no pollution is required, an oil-free or oil-free lubricated cylinder should be selected.

3. Piston stroke
It is related to the occasion of use and the stroke of the mechanism, but the full stroke is generally not selected to prevent the piston and the cylinder head from colliding. If it is used for clamping mechanism, etc., an allowance of 10 to 20 mm should be added according to the calculated stroke.

4. Installation form
It depends on the installation location, purpose of use and other factors. In general, a stationary cylinder is used. When it is necessary to rotate continuously with the working mechanism (such as lathes, grinders, etc.), the rotary cylinder should be selected. When the piston rod is required to swing in a circular arc in addition to linear motion, the pin-type cylinder is used. When there are special requirements, the corresponding special cylinder should be selected.

5. The speed of the piston
It mainly depends on the input compressed air flow of the cylinder, the size of the intake and exhaust ports of the cylinder and the size of the inner diameter of the conduit. It is required to take a large value for high-speed motion. The movement speed of the cylinder is generally 50~800mm/s. For high-speed motion cylinders, an intake pipe with a large inner diameter should be selected; for changes in load, in order to obtain a slow and stable motion speed, a throttling device or a gas-liquid damping cylinder can be selected, which is easier to achieve speed control. When choosing a throttle valve to control the speed of the cylinder, it should be noted: when the horizontally installed cylinder pushes the load, it is recommended to use the exhaust throttle to adjust the speed; when the vertically installed cylinder lifts the load, it is recommended to use the intake throttle to adjust the speed; the end of the stroke is required to move smoothly When avoiding impact, a cylinder with a buffer device should be used.

Post time: Apr-20-2022