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Views: 211 Author: Site Editor Publish Time: 2022-07-19 Origin: Site
There are many types of cylinders. According to the driving mode, cylinders are divided into single-acting cylinders and double-acting cylinders. How to choose between the two? If there is a load when the cylinder returns, we select double acting air cylinder, otherwise select single acting air cylinder.
According to the piston rod, the cylinder is divided into single piston pneumatic cylinder and double piston pneumatic cylinder. According to the lubrication method, the cylinder is divided into non-lubricating cylinder and pneumatic pusher cylinder and so on.
Selection of cylinder should focus on the cylinder stroke, bore and structure.
Generally, the cylinder bore that we often refer to refers to the inner diameter of the cylinder. Cylinder stroke is the distance the piston moves.
First, determine the type of cylinder according to the operating style. Under normal circumstances, the cylinder operation mode includes single and double-acting spring pressing in and single-acting spring pressing out. According to this, the cylinder is divided into spring return pneumatic cylinder and spring loaded pneumatic cylinder.
Then determine the buffer, magnetic switch, cylinder bore size, cylinder stroke, cylinder model, cylinder installation method, cylinder accessories and so on.
Note that there is a general error in the stroke of the cylinder, which is about +/-1mm. Therefore, when precise positioning is required, a large stroke cylinder and a double stroke pneumatic cylinder need to be selected. In addition, an upper limit device must be added to limit the position.
Finally, we also use the cylinder output force calculation table to calculate. After knowing the cylinder diameter and air pressure, the output force of the cylinder can be calculated.
Facing different working occasions, how to choose the cylinder correctly?
According to the working requirements and conditions, the correct type of cylinder is selected. It is required that the cylinder reach the end of the stroke without impact and impact noise. Buffer cylinders should be selected. If light weight is required, light cylinders should be selected. Narrow installation space and short stroke are required. Thin cylinders are optional. With lateral load, tie rod air cylinder is optional. If high braking accuracy is required, a locking cylinder should be selected. The piston rod is not allowed to rotate, and a cylinder with rod non-rotating function is optional. Heat-resistant cylinders should be used in high temperature environments. In a corrosive environment, a corrosion-resistant cylinder is required. In harsh environments such as dust, it is necessary to install a dust cover on the extension end of the piston rod. When pollution-free is required, oil-free lubrication cylinders should be selected.
Determined according to factors such as installation location and purpose of use. In general, a fixed cylinder is used. When it is necessary to continuously rotate with the working mechanism (such as lathes, grinders, etc.), rotating air cylinders should be used. When the piston rod is required to move in a circular arc in addition to linear motion, shaft pin cylinders are used. When there are special requirements, the corresponding special cylinder should be selected.
The size of the force is the choice of cylinder diameter. Determine the thrust and pulling force output by the cylinder according to the size of the load force. Generally, the force of the cylinder is required to balance the conditions of the external load theory, and different load rates are selected according to different speeds, so that the output force of the cylinder has a little margin. The cylinder diameter is too small and the output power is not enough, but the cylinder diameter is too large, making the equipment bulky, increasing the cost, and increasing the gas consumption and wasting energy. When designing the fixture, the force expansion mechanism should be used as much as possible to reduce the overall size of the cylinder.
This is related to the use occasion and the stroke of the mechanism, but generally the full stroke is not selected to prevent the piston and the cylinder head from colliding. If it is used for clamping mechanism, etc., a margin of 10-20 ㎜ should be added according to the calculated stroke.
This mainly depends on the input compressed air flow rate of the cylinder, the size of the cylinder's intake and exhaust ports and the size of the inner diameter of the duct.