Several important parameter diagrams for cylinder model and size selection

Several important parameter diagrams about cylinder model and size selection are answered by the editor of Shenwei:

1. The standard cylinder is one of the most widely used cylinders. Commonly used ones include Airtac SC cylinder, SI cylinder, SU cylinder;DNC Festo FESTO cylinder, SMC MBB cylinder, domestic QGB series, etc.

2. Main features and advantages of standard cylinders,
1. The cylinder bore ranges from 32 to 320mm, and the cylinder stroke can reach 2000mm.
2. Both the front and rear end caps of the cylinder have buffer adjustment functions, so that the cylinder piston runs smoothly at both ends without a sense of impact.
3. A variety of cylinder installation accessories are available, which is flexible and changeable.
How to select standard cylinder? First choice is to confirm the bore and stroke





3. Cylinder bore stroke

The stroke is the error distance between the extension and retraction of the piston rod. Some people calculate the stroke by exposing the cylinder itself, which is wrong. The cylinder diameter is the diameter of the inner wall of the cylinder. Generally, measuring the outer diameter can also estimate the size of the inner diameter. Under the same air pressure, the larger the cylinder diameter, the greater the output.

The functions of commonly used standard cylinders in China are the same, the main difference is the appearance, installation size and model;
This is the basic outline drawing of a standard cylinder. Confirm the installation distance of the cylinder KB and confirm the total distance of the A+ stroke cylinder. The dimensions that need to be confirmed are also different if the installed accessories are not accessible.

4. Standard cylinder
Dimensions that need to be confirmed for flange plate installation and front flange installation need to be confirmed: the distance from the flange to the red line of the piston rod and the mounting hole spacing of flange plates BD and BF. If it is rear installation, the same principle only needs to ensure the distance from the flange to the top of the cylinder. At this time, the distance between the mounting holes of the cylinder itself is not important.

5. Standard cylinder FA diagram
Use the CACB attachment to install and ensure the diameter of the DE hole and the distance from the center point to the top of the cylinder piston. The distance between the mounting holes of the cylinder itself does not matter.

6. Standard cylinder CA drawings
When installing with an LB foot seat, you need to confirm the distance between the AC+ travel mounting holes. To facilitate the installation of the bracket, confirm the middle distance and telescopic length from the bottom of the bracket to the piston rod.

7. Standard cylinder LB diagram
TC and TCM center swing accessory brackets are installed to ensure the distance from the TC intermediate shaft to the top of the cylinder

8. Standard cylinder TC diagram
Standard cylinders have the widest variety of accessories. Different accessories can ensure the installation and use of the cylinder in various working environments and achieve unexpected results.







9. The cylinder structure is composed of cylinder barrel, end cover, piston, piston rod and seals.

1.Cylinder tube
The inner diameter of the cylinder barrel represents the output force of the cylinder. The piston must reciprocate smoothly in the cylinder, and the surface roughness of the inner surface of the cylinder should reach Ra0.8μm. The CM2 cylinder piston uses a combined sealing ring to achieve two-way sealing, and the piston and piston rod are connected by riveting without nuts.

2. End cap
The end cover is provided with intake and exhaust openings, and some also have a buffer mechanism inside the end cover. The rod side end cover is equipped with a sealing ring and a dust ring to prevent air leakage from the piston rod and external dust from mixing into the cylinder. There is a guide sleeve on the rod side end cover to improve the guiding accuracy of the cylinder, bear a small amount of lateral load on the piston rod, reduce the amount of downward bending of the piston rod when it extends, and extend the service life of the cylinder. Guide sleeves are usually made of sintered oil-containing alloy, forward-inclined copper castings. In the past, malleable iron was commonly used for end caps. In order to reduce weight and prevent rust, aluminum alloy die-casting was often used, and brass materials were sometimes used for micro cylinders.

3.Piston
The piston is the pressurized part in the cylinder. In order to prevent the left and right chambers of the piston from channeling air, a piston sealing ring is provided. The wear-resistant ring on the piston can improve the guidance of the cylinder, reduce the wear of the piston seal ring, and reduce friction resistance. The wear-resistant ring length uses materials such as polyurethane, polytetrafluoroethylene, cloth-filled synthetic resin, etc. The width of the piston is determined by the size of the sealing ring and the necessary length of the sliding section. The sliding part is too short, which can easily cause early wear and jamming. The materials of piston are commonly aluminum alloy and cast iron, and the piston of small cylinder is made of brass.

4.Piston rod
The piston rod is the most important force-bearing part in the cylinder. Usually high carbon steel is used, the surface is plated with hard chromium, or stainless steel is used to prevent corrosion and improve the wear resistance of the sealing ring.

5.Sealing ring
The seal of the rotating or reciprocating parts is called a dynamic seal, and the seal of the stationary part is called a static seal.
The main methods of connecting the cylinder barrel and the end cover are as follows:
Integral type, riveted type, threaded connection type, flange type, tie rod type.

6. The cylinder must rely on