The models and types of SMC cylinders, as well as basic structure diagrams of SMC cylinders
The models and types of SMC cylinders
1. Classify by function
Ultra-small: SMC CJ2 series, with a minimum cylinder diameter of 2.5mm
Needle type: SMC CJP2 series, with cylinder diameters of 6mm, 10mm, and 15mm
Standard types: SMC CJ2 series, CM2 series, CA2 series, MB1, MB series, CS2, CS1 series
European standard types: SMC C55, C85, C95, CP95
Free-installation type: SMC CU, CUJ series
Thin type: SMC CQ2, CQS series
Lightweight type: SMC CG1 series
Elliptical piston type: SMC MU series
Locking type: SMC CL, CN series
End lock type: SMC CB series
Pneumatic slide table: SMC MX series
Sliding device type: SMC CXW series
Dual type: SMC CXS series
Mechanical rodless cylinders: SMC MY1, MY3 series
Magnetic rodless cylinders: SMC CY1, CY3 series
Thin type with guide rod: SMC MGP, MGQ series
Guide rod type: SMC MGG, MGC series
Stop type: SMC RS series
Rotary clamping type: SMC MK series
2. Classified by size:
By cylinder diameter classification, cylinders with a diameter of less than 10mm are generally called micro cylinders, those with a diameter of 10 to 25mm are called small cylinders, those with a diameter of 32 to 100mm are called medium cylinders, and those with a diameter greater than 100mm are called large cylinders.
3. Classified by installation method:
Basic installation type: Installation is carried out by using the threads or through holes on the cylinder block, etc
Foot type: Installation is carried out in an L shape
Flange type: Installation is carried out through flanges, including rod side flange installation and rodless side flange installation
Earring type: Installed through earrings, it can achieve the swing of the cylinder, and is divided into single earrings, double earrings, and one-piece earrings.
Ear shaft type: It can be installed through an ear shaft to achieve the swing of the cylinder. It is divided into rodless side ear shafts, rod side ear shafts, and middle ear shafts.
4. Classified by buffering method:
No buffer, cushion buffer, air buffer, and hydraulic buffer set (for high speed)
5. Classified by lubrication method:
It can be divided into oil-gas supply cylinders and non-oil-gas supply cylinders.
6. Classification by location detection method:
Limit switches, magnetic switches.
7. Classified by driving mode:
Single-acting cylinders and double-acting cylinders.
Basic structure diagram of the SMC cylinder
Due to the different purposes of cylinder usage, the structure of cylinders is also diverse, but the most widely used is the single-rod double-acting cylinder. The following takes the single-rod double-acting cylinder as an example to illustrate the basic structure of the cylinder.
The models and types of SMC cylinders, as well as basic structure diagrams of SMC cylinders
The above figure shows the structural principle diagram of the SMC CM2 series double-acting cylinder, which is composed of the cylinder barrel, end cover, piston, piston rod, and seal - these are also the five major parts that make up the cylinder!
The inner diameter of the cylinder barrel represents the magnitude of the output force of the cylinder. The piston should slide back and forth smoothly in the cylinder barrel, and the surface roughness of the inner surface of the cylinder barrel should reach Ra0.8 μ m. For the steel pipe cylinder barrel, the inner surface should also be plated with hard chromium to reduce frictional resistance and wear, and to prevent rust. The material of the cylinder barrel is not only high-strength carbon steel pipe, but also high-strength aluminum alloy and brass. Small cylinders are made of stainless steel tubes. For cylinders with magnetic switches or those used in corrosion-resistant environments, the cylinder barrels should be made of materials such as stainless steel, aluminum alloy, or brass.
The SMC cylinder piston adopts a combined sealing ring to achieve bidirectional sealing. The piston and the piston rod are connected by riveting, without the need for nuts.
The end cover is equipped with intake and exhaust ports, and for oil, a buffer mechanism is also provided inside the end cover. The side end cover of the rod is equipped with a sealing ring and a dust-proof ring to prevent air leakage from the piston rod and to prevent external dust from entering the cylinder. A guide sleeve is provided on the side end cover of the rod to improve the guiding accuracy of the cylinder, bear a small amount of lateral load on the piston rod, reduce the downward bend when the piston rod extends, and extend the service life of the cylinder. Guide sleeves are usually made of sintered oil-impregnated alloys or forward-inclined copper castings. In the past, the end covers were commonly made of malleable cast iron. Now, to reduce weight and prevent rust, aluminum alloy die-casting is often used. Some micro cylinders are made of brass.
The piston is the pressure-bearing part in the cylinder. To prevent gas leakage between the left and right chambers of the piston, a piston sealing ring is provided. The wear-resistant rings on the piston can enhance the guidance of the cylinder, reduce the wear of the piston sealing ring, and decrease the frictional resistance. Wear-resistant rings are made of materials such as polyurethane, polytetrafluoroethylene, and fabric-reinforced synthetic resin. The width of the piston is determined by the size of the sealing ring and the necessary length of the sliding part. The sliding part is too short, which can easily cause early wear and jamming. The materials commonly used for pistons are aluminum alloy and cast iron. For small cylinders, the pistons are made of brass.
The piston rod is the most important force-bearing part in the cylinder. Usually, high-carbon steel is used, with its surface treated by hard chromium plating, or stainless steel is used to prevent corrosion and enhance the wear resistance of the sealing ring.
The sealing of components in rotary or reciprocating motion is called dynamic sealing, and the sealing of stationary parts is called static sealing.
The main connection methods between the cylinder barrel and the end cover are as follows:
Integral type: The cylinder barrel and one end cover are made into one piece by forging process, while the other end cover is fixed to the cylinder barrel by riveting or with a retaining ring. Used for micro cylinders and small cylinders.
Riveted type: Grooves are opened on the end cover, and the two ends of the cylinder barrel are riveted into the grooves of the end cover to form an integral piece. Used for medium and small-sized cylinders.
Threaded connection type: The cylinder barrel and the end cover are provided with connecting threads to connect them together. Used for medium and small-sized cylinders.
Flange type: Flanges are provided on both the cylinder barrel and the end cover, which are connected together with bolts. Medium and small-sized cylinders for space-saving.
Pull rod type: Four pull rods are used to clamp the two end covers and the cylinder barrel together, and there is a sealing ring between the end covers and the cylinder barrel. It is used to form medium and large-sized cylinders that are neither too long nor too short.
Above are the models and types of SMC cylinders, basic structure diagrams of SMC cylinders, and to learn more related information is available at https://www.joosungauto.com/.
